WO2012059775A2

WO2012059775A2 - System for reproducing a 3d color image using narrowband modulation of monochromatic components of the image

Info

Publication number: WO2012059775A2
Application number: PCT/HR2011/000035
Authority: WO
Inventors: Dubravko Moravski
Original assignee: Intesis d o o
Current assignee: Intesis d o o
Priority date: 2010-11-05
Filing date: 2011-08-31
Publication date: 2012-05-10
Anticipated expiration: 2013-05-05
Also published as: WO2012059775A3

Abstract

Systems for the reproduction of 3D color images on a projection screen or an emissive display using narrowband modulation of monochromatic components of the image have been described with this subject invention. The stated systems include novel solutions of 3D reproduction using narrowband frequencies of light. The following systems have been included: the system of reproducing 3D color images by projection of monochromatic components of the color image created simultaneously, the system of reproducing 3D color images by projection of monochromatic components of the color image created in temporal sequence, projecting 3D color images by using reflection and transmission through interference filters, reproducing 3D color images using displays with narrow spectrum emissive pixels, the system using background optical guide of narrowband light, and the system using narrowband filters arranged in a series with a pixel matrix. The mutual characteristics of all solutions, depending on the construction thereof, are a wide viewing angle, very favorable separation of the left and right channels, and reproduction without flickering. For projections reproductions, the possibility of using any surface as a screen/display exists, including those that are used for 2D projection. For viewing in all reproduction techniques according to the invention, it is possible to use the same passive type 3D glasses, i.e. those that do not contain electronics or batteries, resulting in lighter glasses and a more comfortable wear and simpler maintenance.

Description

SYSTEM FOR REPRODUCING A 3D COLOR IMAGE USING NARROWBAND MODULATION OF MONOCHROMATIC COMPONENTS OF THE IMAGE

DESCRIPTION OF THE INVENTION

Technical field

The subject invention - a system for reproducing a 3D color image using narrowband modulation of monochromatic components of the image - pertains to the area of technology classified under G02B27/22, G03B35/26 and H04N15/00 according to the International Patent Classification.

Technical problem

The system for reproducing 3D color images using narrowband modulation of monochromatic components of the image implicitly includes several basic components: a display (projection screen or emissive display) on which the reproduction of 3D color images is made, an appliance that enables the creation of the 3D color images on a display and optionally, 3D viewer's glasses for viewing the reproduction. In accordance with the efforts that are generally and continuously attempted in the stated technical field, the subject invention's purpose is to resolve the following technical problems:

• Achieving the highest quality of 3D color image reproduction on a display in respect to true color, additional brightness, contrast, image refreshing frequency, avoiding "ghosting" between the left and right channels for the left and right eye, in the manner that the achieved quality is equal or better than the currently accepted and used solutions;

• Regarding projection reproduction, the possibility of using any type of surface as the screen/display, including those used for 2D projection;

• Reproduction of 3D color images on emissive displays without a projector, which is especially relevant for environments with significant ambient lighting that would overly attenuate the projection;

• The possibility of using the same 3D glasses for viewing all reproduction technologies such as screen projection and reproduction on displays. A passive type of 3D glasses is favorable, i.e. glasses that do not contain electronics and batteries, whereby they are lighter and more comfortable to wear and easier to maintain;

• The possibility of using regular white light spectrum projector lamps for projection;

• The viewing angle from the viewing area must be restricted as minimally as possible;

• The possibility of significant simplification of the construction of filters necessary for the projection system.

State of the art

For reproducing color images on a screen/display, many known methods of achieving a 3D effect exist, of which the following four methods are most common.

One of the most well-known methods is the anaglyph technique using differently colored left and right lenses on the viewer's 3D glasses with an appropriately processed 3D image. The evident disadvantages of this technique are "ghosting" between channels and a significant loss of color. The 3D glasses are passive, with anaglyph filters, for example a wideband red filter for the left eye and a wideband cyan or blue filter for the right eye; this frequent combination is popularly known as red-blue 3D glasses. Projection with linear or circular polarization filters is also encountered, which requires a special metallic projection screen that preserves the polarization of the reflected light. The disadvantage of this projection method on such a screen consists of the fact that the angle inside which the projected image can be viewed at a high quality from the viewing area is narrow and limiting. The 3D glasses are passive, with compatible polarization filters on the projection sides as well.

The third most common method is a projection or displays synchronized with active 3D glasses, where images for one, then the other eye are shown alternately on the same screen/display, and the 3D glasses synchronously darken the left and right lenses. The disadvantage of this reproduction method is that the 3D glasses are relatively massive in comparison to passive glasses and require regular recharging and battery replacement, and some models cause a noticeable coloration of the image. There is likewise a significant demand on the operational speed of the image modulator and of the 3D glasses, which must operate at a sufficient speed in order to prevent the perception of flickering.

An advanced solution in respect to the previous methods, in the sense that practical implementations avoid the aforementioned disadvantages, is projection with a narrowband frequency of light, where the narrowband frequencies of light are achieved:

• With serially connected multiband interference filters, as described in patent WO 2009/026888 Al .

• With multiple narrowband light sources (e.g. lasers), as described in patent US 6,283,597 Bl .

This type of reproduction achieves a stereoscopic 3D display, i.e. two simultaneous or nearly simultaneous images on a screen/display, where the three primary colors designated with the usual abbreviations R (red), G (green) and B (blue), necessary for the complete reproduction of the image for each eye, are shown in various frequencies or wavelengths of light for each eye (figure l a). For example, frequencies Rl , G l and B l can be used for the left eye, while R2, G2 and B2 can be used for the right eye. Due to the eye's imperfections, with such three frequencies per eye, an adequate reproduction of the entire visible color spectrum is possible. The wider R, G and B ranges in figure l show the eye's simplified sensitivity to primary color frequencies; for each range, it is favorable that the selected frequencies are as near to maximum sensitivity as possible, e.g. that Rl and R2 are as near to the eye's maximum sensitivity of the color red (R). It is likewise favorable that pairs of selected frequencies are mutually as near as possible, as color hues begin to otherwise differ significantly, for example considerably separated green hues (G) G 1 would bleed into blue, and G2 into yellow.

Meanwhile, the brightness of the image on the screen/display is approximately represented by the area under the curve, not by the eye's relative sensitivity curve for individual frequencies (I). The filter that would have a nearly perfect transmission characteristic as shown in figure la, would allow the passage of a very small amount of light. The other extreme, very wide filters, would pass a large amount of light, but would not fit in the individual R, G and B ranges. Because of the large number of permeated light frequencies, the light filtered in such a manner would result in low-quality, faintly saturated color.

As an optimal solution, narrow filters with a width of the permeating frequency band of approximately 20-30 nm (figure lb) are thus used, which is a practical compromise of two requirements. The first requires the filter's passage band to be as wide as possible in order to allow as much light as possible to pass through. The second requires that the band remains narrow in order to maintain color saturation and decrease overlapping with neighboring filters.

Due to those specificities, the selected frequency bands of light for any primary color (for example, red color for the left eye and red color for the right eye) regularly noticeably differ visually because of the filter's varying central frequencies. This problem is resolved electronically by processing the video frames prior to reproduction by appropriately blending the primary colors' available components. Due to the human eye's imperfections, spectrum differences between images assigned to the left and right eyes are not observed in the final image, by employing color alterations using this procedure, called color correction.

The mentioned processing must be used with each implementation of 3D reproduction using a narrowband frequency of light.

3D glasses for such projection are manufactured with serial multiband narrowband interference filters and properly allow passage of only those bands that correspond to the left or right eye.

The execution of a 3D projection with narrowband frequencies of light that is currently most widely used in practice, especially for digital cinema projectors, is shown in figure 2. A light beam generated by passing through wideband 2D color filters and an image modulator inside of the projector exits the projector (1 ) and then passes through a rotating pair of serial multiband narrowband interference filters (FRI+GI+BI and FR2+G2+B2), which temporally sequential, and synchronously with the operation of the image modulator i.e. with the reproduction of the digital "film", allow the alternate passage of band groups Rl , Gl and B l as well as R2, G2 and B2, and as a light beam (3) is projected on a screen/display (6), and further as a beam (5) is reflected from the screen/display (6) to the viewers' 3D glasses (4) with filters for the right and left eyes.

Because of the inertia of the eye, the left and right eyes simultaneously see different channels or images, which results in the 3D effect.

The disadvantage of this implementation is decreased projection brightness of the image due to:

• Sharing of light through time into left and right channels for the left and right eyes.

• The filter's structure, which can never be perfectly permeable or impermeable, as the light must consecutively pass through both the 2D wideband filters for primary colors inside the projector and the 3D filters for "installation" of 3D information.

As an example of attempting to achieve a greater brightness of the projected image, a known application thereof is the use of two projectors with stationary serial multiband narrowband filters. One projector projects images for only one, e.g. the left channel, and the other projector projects images for only the other, e.g. the right channel. Two light beams simultaneously exit the projectors, and each passes through its serial multiband filter (FRI₊GI₊BI and F ₂+G2+B2), and the filtered light (3a and 3b) hits a screen/display (6).

The advantage of this application is twice as much brightness of the projected image in comparison with the solution shown in figure 2. The disadvantage is the necessity for an additional projector, thus this variation is used in cases where a greater brightness is necessary due to room size and if the cost of an additional projector is acceptable.

Anaglyph reproduction is avoided whenever possible due to considerable color loss. The favorable aspects thereof are low cost and reproduction possibilities on 2D emissive displays. The technique using active 3D glasses is currently the most widely used with emissive displays, and the most significant disadvantage is the necessity for active 3D glasses themselves. Furthermore, creating fast displays is technically more complicated, which for this purpose, must typically operate at a minimum of a usual 120 Hz (while 60 Hz is sufficient for 2D reproduction, depending on the specific technology). Additionally, due to the sharing of the displays in time into reproductions of left and right images, at least 50% brightness is lost, and usually more in reality as the display and 3D glasses require some time to shift to the reproduction of the next image.

Similar to this is one of the solutions described in patent WO 2009/026888 Al, where passive multiband 3D glasses and a fast display (e.g. at 120 Hz) are used, and the backlight changes the light spectrum that illuminates the display's background.

Less known solutions are:

• With interlaced lines - half of vertical resolution is lost due to the display lines successively displaying lines of the left and rights sides of the 3D image, which additionally causes the loss of detail and illegibility of smaller text;

• With perpendicularly positioned polarized displays and a semi-translucent mirror - requires a large room volume and is costly;

• Dual panel (according to the solution of the company iZ3D), where one LCD display simultaneously reproduces combined color images for both left and right channels, while the other is positioned in immediate proximity and modulates the emerged light into the left or right direction, changing polarization - ghosting and color distortion is observed, due to the fact that it is impossible for the first display to simultaneously display color information for both eyes, correctly for all scenes.

• Head mounted displays (HMD), similar to 3D glasses by mechanical structure, with the difference being the lenses of the 3D glasses replaced with emissive displays of appropriate size - disadvantages are low display resolution (currently higher quality commercial solutions are limited to 800^x600 or 640x480 resolutions) and viewing possibilities are limited to one user.

• Without glasses, with a parallax barrier in front of the display.

Analyzing the existing described solutions, we can conclude that:

• Some solutions have noticeable disadvantages that significantly lower reproduction quality.

• Some solutions provide good quality reproduction, but allow for the possibility of significant structure simplification, as well as achieving additional projection brightness.

• Some solutions do not enable a quality 3D reproduction in spaces with considerable ambient lighting.

Essence of the invention

The subject invention describes a system for reproducing 3D color images onto a projection screen or emissive display, which includes novel solutions of 3D reproduction using narrowband frequencies of light. Narrowband frequencies of light are obtained by using optical filters F implemented as narrowband singleband filters, or narrowband light sources, or a combination of filters and light sources. Furthermore, for each of the basic colors R, G and B at least one pair of the mentioned filters (F I , FG I and FBI ; FR2, FG2 and FB2) or light sources exist. The mutual characteristics of all solutions, depending on structure, are a wide viewing angle, a very favorable separation of left and right channels, and flicker-less reproduction. The possibility of installing primary color wideband filters for reproduction of 2D color images (FR, FQ and FB) has been foreseen, which provides the possibility of achieving an optional system of reproducing 3D or 2D color images, whereby in the case where light beams pass through both an image modulator M and narrowband singleband filters (F_R | , FG I and FB I ; F_R2, FG2 and F_B2), reproduction of 3D color images is achieved, while in the case where light beams that pass though an image modulator M and then only pass though primary color wideband filters (FR, FG and FB), reproduction of 2D color images is achieved.

In the event of projection reproduction, the possibility of using any type of surface as a screen/display exists, including those that are used for 2D projections.

For viewing in respect to all reproduction techniques according to the invention, it is possible to use the same 3D passive type glasses, i.e. those that do not contain electronics and batteries, which yield them lighter and more comfortable and easier to maintain. Suitable 3D glasses contain three or more serial narrowband filters for each eye, compatible with selected narrowband frequencies of light in the manner that they allow passage of the appropriate narrowband color image components to the corresponding eye.

The following implementations included within the subject invention are described hereafter, which yield a better and higher quality 3D reproduction using narrowband frequencies of light:

/. Reproduction of 3D color images by projection of monochromatic components of the color image created simultaneously

2. Reproduction of 3D color images by projection of monochromatic components of the color image created in temporal sequence

3. Reproduction of 3D color images by projection using reflection and transmission through interference filters

4. Reproduction of 3D color images using displays with narrow spectrum emissive pixels

5. Reproduction of 3D color images using background optical guides for narrowband light

6. Reproduction of 3D color images using narrowband filters arranged in a series with a pixel matrix

The stated implementations are shown in detail in the figures, with a brief description thereof stated hereafter:

• Figure l a displays the arrangement of frequencies, i.e. wavelengths of light for 3D projection with selected frequencies of light bands

• Figure l b displays the arrangement and width of light band frequencies for 3D projection with several light bands

• Figure 2 displays the implementation of 3D projection with rotating multiband interference filters and one projector according to the current state of the art

• Figure 3 displays the 3D projection system with stationary narrowband singleband filters constructed with two projectors according to the subject invention

• Figure 4 displays the scheme of the general implementation of the 3D projection system with stationary narrowband singleband filters

• Figure 5 displays the 3D projection system containing two projectors with mobile narrowband singleband filters and the sharing of the image modulator in temporal sequence

• Figure 6 displays the sequence of the filtered light through time for the filters (F_{R I} /_G I/B I and FR₂/G2/B2) shown in figure 5 • Figure 7 displays the 3D projector with mobile narrowband singleband filters and shared image modulator

• Figure 8 displays the sequence of the filtered light through time for the filter assembly (FRI/GI/BI/R2/02/B2) shown in figure 7

• Figure 9 displays the implementation of a mobile filter assembly with primary color narrowband singleband filters for filtering white light in temporal sequence

• Figure 10 displays the creation of monochromatic components of the color image (2MF) using a narrowband singleband filter (F) and an image modulator (M)

• Figure 1 1 displays a 3D emissive display, comprising of a matrix of 3D illuminated pixels

• Figure 12 displays the practical implementation of 3D projectors with two projection lamps, one optical output and six transmissive image modulators

• Figure 13 displays the practical implementation of 3D projectors with one projection lamp, one optical output module and one reflective image modulator

• Figure 14 displays the practical implementation of a 3D projection system with stationary narrowband singleband filters/mirrors.

• Figure 1 5 displays the implementation of a 3D display with backlight that uses narrowband frequencies of light

• Figure 16 displays the backlight guides of the 3D display shown in figure 1 5

• Figure 17 displays the implementation of a 3D display that uses narrowband frequencies of light with pixels that produce their own light and filters (FR I+G I+BI and FR₂+G2+B2) positioned in front of pixels

• Figure 18 displays the construction phases schematic of the fabrication of parallel multiple narrowband filters for the 3D display as shown in figure 17

• Figure 19 displays some possible implementations of the 3D system with narrowband filters arranged in a series with a pixel matrix

A detailed description of the various realizations for achieving 3D image reproduction according to the subject invention is described hereafter.

1. Reproduction of 3D color imases by projection of monochromatic components of the color image created simultaneously

The novel solution of the system for reproducing 3D color images by projecting monochromatic components of the color image created simultaneously has been realized by using narrowband frequencies of light as shown in figure 1 b, where for each component of the image (Rl , Gl , B l , R2, G2, B2) one narrowband singleband filter is used, paired with one image modulator, as shown in figure 10. White light 2 generated by the projector lamp 7 passes through filter F, and then filtered light 2F further passes through the image modulator M (or is reflected from it, depending on how the used modulator functions), which finally results in the monochromatic component of the color image 2MF of components Rl or Gl or B l or R2 or G2 or B2. The sequence of positioning filter F and modulator M within the system can be reversed; in such a case, white light 2 first passes through the image modulator , whereupon modulated white light 2_M results and then passes through filter F, which finally results in the same monochromatic component of the color image 2MF of components Rl or Gl or B l or R2 or G2 or B2. Due to the decreased heating of modulator M, the first case is preferred where filter F is positioned closer to the light source 7, though both schemes are equally functional.

The image modulator can be implemented in any suitable technology (LCD, DMD, LCoS, etc.) and the narrowband singleband filter as an interference filter. The schematic of the system with such filters and image modulators is illustrated in figure 3. Each channel has a source 7 of white light beams 2, which generate light whose beams pass through primary color narrowband singleband filters (FR I , FG I and FB I ; FR₂, FQ2 and FB₂). In the next phase, the beams of such filtered light hit the image modulators M implemented in any suitable technology. With the passage of individual light beams through the narrowband singleband filter (e.g. FR I) and the image modulator M, an individual monochromatic component of the color image (Rl , Gl , B l ; R2, G2, B2; figure lb) is created. Furthermore, those three light beams containing the created monochromatic components of the image (Rl , Gl , Bl ; R2, G2, B2) combine into one beam and exit the projector through the optical output module 8. Light beams 3a and 3b exit the projector and hit the screen/display 6, on which a 3D image is viewed using passive 3D glasses.

With this system, the resulting 3D image has a greater brightness in comparison to an image resulting from a system shown on figure 2. This is due to the fact that the white light beam is split into individual light beams for the left and right channels, each which then pass through only one narrowband filter, i.e. passage through both primary color wideband filters and through narrowband filters for 3D channels is not necessary. Another advantage is that the singleband filters (FRI , FQ I and F_Bi ; F_R2, FQ₂ and F_B2) are easier to manufacture in comparison to multiband filters (F_{R 1+G}i_+BI ; F_R2+G2+B2)-

The general depiction of the solution regarding 3D reproduction with stationary singleband filters is illustrated in figure 4, with six singleband filters for the primary R, G and B bands, with optional additional filters for eventual additional bands that enable increased brightness or wider gamut, and image modulators M paired thereto. The light sources 7, as well as the combiner and optical output assemblies 8 can exist in arbitrary numbers, shown as dotted in the figure.

Therefore, with this implementation, a system of reproducing 3D color images using narrowband modulation of monochromatic components of the image is presented, which comprises the ability to generate six or more different selected narrowband frequencies of light 2F (Rl , Gl , Bl ; R2, G2, B2) i.e. suitable monochromatic components of the color image, with the assistance of projection lamps 7. The stated monochromatic components of the color image combined are able to reproduce the complete 3D color image onto the projection screen/display 6, visible by using appropriate 3D glasses 4, and the reproduction of the 3D color image is achieved with the light beam 2 passing through both the filter F and the modulator M, and by passing through the optical output module 8, whereby light for reproduction onto the screen/display 3a and 3b is created, and then projected on the screen/display 6. Filters F are implemented as narrowband singleband filters, and for each of the basic colors R, G and B, at least one pair of the stated filters FRI and FR₂, FGI and F_G2„ FB I and FB₂ exists.

The main feature of this system is that all individual light beams 2 simultaneously pass through the system, where each individual light beam 2 first passes through one narrowband singleband filter F, and then through one image modulator M, or in reverse order, thus each creating one monochromatic component of the color image (Rl , G l , B l , R2, G2 or B2), whereby all individual monochromatic components of the color image are simultaneously created and then simultaneously projected onto the screen/display 7. Three filters for the basic colors Rl , Gl and B l serve to filter the white light 2 for the left eye, and the other three filters R2, G2 and B2 serve to filter the white light 2 for the right eye.

One of the possible alternatives of the aforementioned solution, concerning the problematics of using a projector for 2D projections as well, is schematically shown in figure 12. 3D projection filters F I , FQI and FB I (the analogy is valid for the other side with filters F_R2, F_G2 and FB2) can be installed in the projector:

• In series with primary color wideband filters for 2D projection at positions F_R, FG and F_B. The spectrum of filters FR I , FGI and FB I is so narrow that the permeation spectrum of ordinary filters FR, FG and FB does not affect the realization of the 3D effect; but the serial passage of light through numerous filters decreases the final brightness of the image.

• Independently, i.e. wideband primary color filters FR, F_g and FB are not installed.

• In the manner that a mechanism is implemented that places alternatively either a set of FR, FG and FB filters on the path of light beams, for 2D projections, or places a set of FR I , FQ I and FBI filters on the path of light beams, for 3D projections.

Even though filters F_R| , FQ I and F_B | can be used for 2D projection upon color correction (the same image is transmitted to another projector or it is not used at all, and 3D glasses are likewise not used; nevertheless, such configurations are not used in the state of the art in practice), using exclusively primary color wideband filters for 2D projections results in significantly brighter 2D projections.

Advantages of the implementation of the 3D projector with narrowband singleband filters in comparison to existing systems with serial multiband filters are additionally manifested as follows:

• Larger filter permeability, because in combination with serial multiband filters (as is implemented in figure 2) primary color wideband filters (FR, F_g and F_B) would be necessary, which would cause additional light dimming.

• Constant mechanical motion is not present, such as the rotating filter pair in the implementation as shown in figure 2.

• A simpler technical implementation of singleband filters, and consequentially with lower price than multiband filters.

• No flickering or switching between left and right sides, nor loss of brightness due to sharing of the same projector through time.

The system can use the same passive 3D glasses as are used in the system with serial multiband interference filters from the state of the art.

Implementations using three narrowband frequencies of light per eye have been stated as an illustrative example because they are currently the most practical, but the number of bands is actually arbitrary, up to the point to where it is possible to create a satisfactory final color spectrum.

Taking into account that, for each channel, the filters in 3D glasses are made as serial multiband filters with three bandpass filters, filters on the projector's side can be implemented as three narrowband filters. However, it is possible to implement the lowest (in the sense of the wavelength of the central permeable frequency) filter as a lowpass filter, as all lower frequencies will anyhow be "rejected" by the 3D glasses. Analogously, it is possible to implement the highest filter as a highpass filter, as all higher frequencies will anyhow be "rejected" by the 3D glasses.

On figure 12, the scheme of one of the possible constructions of the 3D projector with two projection lamps 7 for achieving greater brightness of the projected image has been illustrated. The light of the lamps 7 for both channels are directed by reflectors 9 and focused with Fresnel lenses 10. The optical splitting systems 1 1 split light into three beams.

For 3D projection according to the subject invention, light comes across singleband narrowband filters F I , FG I and FB I ; FR₂, FG2 and FB2 that create primary color bands as shown on figure lb. Light further passes through transmissive image modulators M, which modulate the monochromatic components of the color image Rl , Gl and B l , i.e. R2, G2 and B2, and are furthermore combined in the appropriate combining element 8a of the optical output module 8 and exit the projector through the output optics 8b.

For 2D projection, a mechanism removes 3D filters FRI , FG I and FB I ; F_R2, F_g2 and F_B2 from the light's path and replaces them with primary color wideband filters FR, FG and FB (left); FR, F_G and F_b (right), and therewith achieves a significantly brighter 2D projection than would be possible with the simultaneous use of singleband narrowband filters.

For 3D projection, a mechanism removes 2D filters FR, F and FB (left); FR, FG and FB (right) from the light's path and replaces them with singleband narrowband filters F_{R !} , F_Gi and F_Bi ; FR2, FG2 and F_B2 and therewith achieves a brighter 3D projection than would be possible with the simultaneous use of wideband filters.

2. Reproduction of 3D color Imases by projection of monochromatic components of the color imase created in temporal sequence

The novel solution of the system for reproducing 3D color images by projecting monochromatic components of the color image created in temporal sequence as shown in figure 5 has been achieved by using narrowband frequencies of light (as shown in figure l b), where for each component of the image (Rl , Gl , B l , R2, G2, B2) one narrowband singleband filter F is used. The stated filters are inserted one by one in temporal sequence into the light's path that passes through the modulator M. At one point in time, the white light 2 generated by the projection lamp 7 passes through the mobile filter F, and such filtered light 2F then passes through the image modulator M, whereby a monochromatic component of the color image 2MF is created (one of Rl , Gl , B l ; R2, G2, B2). The sequence of positioning the mobile filter (F) and the modulator (M) within the system can be reversed, and in such a case, white light 2 first passes through image modulator M, whereupon modulated white light 2_M results, which then passes through the mobile filter F, and finally results in the same monochromatic component of the color image 2_MF (Rl , G l , B l ; R2, G2, B2). The individual mobile filter F (for one of components Rl , Gl , B l , R2, G2, B2) then moves away from the light's path in temporal sequence and is replaced by the next filter, while the image modulator M synchronously modulates the appropriate new monochromatic component of the image (another one of Rl , G1, B 1 ; R2, G2, B2).

The system according to this implementation operates in the manner that creating monochromatic components of a color image is executed in temporal sequence so that a light beam 2 first passes through one of six or more appropriate narrowband singleband filters F_{R 1} , FQ I and FBI ; F_R2, FQ2 and F_B2, positioned on the mobile filter assembly F, and then through one modulator M, or in reverse order, always in the manner that the filters FRI , FG I and FB I ; FR2, F_G2 and FB₂ interchange on the light beam's 2 path in temporal sequence. Each individual monochromatic component of the color image Rl , G l or B l or R2, G2 or B2 is created when light beam 2 passes through the modulator M, synchronized with the physical position of the appropriate narrowband singleband filter FRI or FQI or F_Bi or FR₂ or F_G2 or FB₂- Herewith, the frequency of changing different monochromatic components of the image must be sufficiently high. The mobile filter assembly F may contain a larger number of the same filters F with the purpose of improving the manner of creating individual monochromatic components of a color image, i.e. in order to increase the occurrence frequency of individual narrowband singleband filters FRI or FGI or FB I or FR₂ or FG₂ or FB2 in front of the light beam 2.

The image modulator can be implemented with any suitable technology (LCD, DMD, LCoS, etc.) and the narrowband singleband filter as an interference filter.

A possible option is the use of two filter assemblies instead of one. Here, the sources 7 of white light 2 generate one light beam each (figure 5) that further passes through the mobile filter assembly, on which three narrowband singleband filters for each channel FRI, FG I and FBI ; FR₂, FQ2 and F_B2 are positioned. At a specific moment, light passes through only one filter e.g. Rl in one and R2 in the other projector 1, then passes through the image modulator M in each projector, on which the sample of the image meant for that monochromatic component of the image Rl or R2 is set at that moment, and furthermore this created monochromatic component of the image passes through the optical output 8 and hits the screen/display 6. Following this, the filter assembly F moves sufficiently in order to allow the beam of white light to arrive at the next narrowband singleband filter for the next monochromatic component of the image, B 1 in one and B2 in the other projector. Synchronously with the movement of the filter assembly F, the sample of the image meant for that second monochromatic component of the image B 1 or B2 is set on the image modulator M, and the entire process repeats as with the previous monochromatic component of the image R. The filter assembly F again moves sufficiently in order to allow the white light beam to arrive at the next narrowband singleband filter for the monochromatic component of image Gl in one and G2 in the other projector, and during this time, the sample of the image meant for that monochromatic component of image G 1 or G2 has already been set on the image modulator M.

Possible optimization of the described operational method, with the purpose of higher light efficiency, can be achieved if the image modulator M modulates the appropriate portions of the image in accordance with the illumination of the image modulator's surface during the movement of the filter assembly F while passing light through portions of two or more filters' surfaces.

The filter assembly F can be implemented as a rotating wheel, where narrowband singleband filters FRI, FQI and FBI (figure 9a) are properly arranged of the rim thereof, and instead of a rotating wheel, different mechanisms for bearing and moving the filter assembly F can be used.

Figure 6 shows the temporal sequence of the permeated light spectrum through the filter assembly F for a system with two projectors, as shown on figure 5.

With less brightness, if all other elements remain unchanged, implementation with all six filters on one rotating wheel in one projector is possible, as illustrated in figure 7. Figure 9b shows such a rotating wheel, additionally illustrating the position of the filters for the left and right sides that decrease flickering by alternate permeation of primary colors for the left and right sides. In this case, one lamp 7 for generating light is used, and the light is permeated through the individual narrowband singleband filters F in temporal sequence on wheel 9b. Synchronously with the rotation of the wheel with filters, the image modulator M modulates monochromatic components of the color image for both channels in temporal sequence. Light 3 exits through the optical output system 8. In any case, it is understood that the reproduction of image components on the image modulator M must be synchronous with the rotation of the filter assembly F and that the rotation velocity i.e. reproduction exchange of individual image components must be sufficiently large in order to avoid flickering of the image.

Due to cost-effectiveness and practicality, this solution uses filters that can have simpler rectangular or circular shapes, which are standardized and ordinary, in comparison with solutions described in patent WO 2009/155152 A l where the key condition is that the filters are spiral-shaped. Stabilizing the brightness across the projection's entire area, if necessary, is implemented e.g. by suitable handling of the image modulator, or in an alternative manner.

Implementation possibilities are not exhausted with the stated solutions containing one or two projectors, as additional possibilities exist:

• Numerous identical filters on the same rotating filter assembly next to one another, for the more efficient use of the rotating wheel's available area. It is desired that as much light passes through the filters as possible, instead of the same being lost on the bearing structure of the rotating filter assembly, as illustrated in figure 9c where the ratio of the filter's and rotating wheel's area is unfavorable in respect to figure 9d (with the assumption that the area of the entering light beam conforms with the area of the individual filters). Practical limitations of the rotating wheel's size are practical filter and housing dimensions.

• Numerous identical filters on the same rotating filter assembly in a mixed array with filters of varying narrowband frequencies (figure 9e), which with e.g. double the number of filters, it is possible to lower the angular velocity of the rotating wheel by half, while maintaining the same speed of image refreshing on the screen/display 6.

• Arbitrary array and number of filters F and lamps 7 and projectors 1 , as long as the described narrowband singleband filters on rotating filter assemblies are used.

The system can use the same passive 3D glasses as are used in the system with multiband filters from the state of the art.

3. Reproduction of 3D color imases by projection using reflection and transmission through interference filters

Reproducing simultaneously created monochromatic components of a color image with this system is achieved by using narrowband frequencies of light (as shown in figure lb), where for each component of the image (Rl , Gl , Bl, R2, G2, B2) one image modulator M paired with one narrowband singleband filter F is used, but where some filters act as a light splitter too, allowing passage and reflecting various frequencies of light. This is achieved by using the fact that interference filters mostly reflect the frequencies of light that they do not allow to pass, and appropriately placing the filters in optical path inside a projector, as illustrated in figure 14.

The image modulator can be implemented in any suitable technology (LCD, DMD, LCoS, etc.) and the narrowband singleband filter can be implemented as an interference filter.

Namely, the reproduction of 3D color images is realized by reflection and transmission through interference filters whereby a white light beam passing through narrowband interference filters F I, FGI and F_Bi ; FR₂, F_G2 and FB2 and mirrors 12a, 12b, 12c is split into narrowband beams l , Gl , Bl , and R2, G2, B2, which then pass through the image modulator M, whereby individual monochromatic components of an image (Rl , Gl, B l ; R2, G2, B2) are created, and then the mentioned created monochromatic components of an image (Rl, G l , B l ; R2, G2, B2) are projected as light for reproduction 3a and 3b on a screen/display 6 upon passage through the optical output module 8.

The schematic of one possible implementation of the system with such filters and image modulators is shown in figure 14. One channel, e.g. the left, operates in the manner that the source of the white light beam, usually a projector lamp 7 with appropriate directing optics, generates white light 2. The narrowband interference filter/mirror FR I for red light Rl passes red light Rl , and reflects the remaining spectrum - green and blue light G and B. The narrowband red light Rl reflects off of the mirror 12c, and passes through the image modulator M, which results in the red component of the image Rl of the left channel.

The narrowband interference filter/mirror F_B i for blue light B l passes blue light Bl, and reflects the remaining spectrum - green light G. Green light G then passes through the narrowband filter FG I for green light Gl , which results in narrowband green light Gl . The narrowband green light G l then passes through the image modulator M, which results in the green component of the image Gl of the left channel.

The narrowband blue light Bl reflects off of the mirror 12a and the mirror 12b, then passes through the image modulator M, which results in the blue component of the image B 1 of the left channel.

All three (Rl , Gl , B l ) image components are combined with a beam combiner 8a, from which one light beam that contains all image components exits. The optical output module 8 calibrates and adapts the light beam for reproduction on a screen/display 3a of the projection area. The light beam 3a of the left channel then hits the projection screen/display 6.

The next, e.g. right channel, is implemented in an equivalent manner: the source of the white light beam, a usual projector lamp 7 with appropriate directing optics, generates white light 2. The narrowband interference filter/mirror Fm for red light R2 passes red light R2 and reflects the remaining spectrum - green and blue light G and B. The narrowband red light R2 reflects off of the mirror 12c, and passes through the image modulator M, which results in the red component of the image R2 of the right channel.

The narrowband interference filter/mirror FB₂ for blue light B2 passes blue light B2, and reflects the remaining spectrum - green light G. Green light G then passes through the narrowband filter FG2 for green light G2, which results in narrowband green light G2. The narrowband green light G2 then passes through the image modulator M, which results in the green component of the image G2 of the right channel. The narrowband blue light B2 reflects off of the mirror 12a and the mirror 12b, then passes through the image modulator M, which results in the blue component of the image B2 of the right side.

All three (R2, G2, B2) image components are combined with a beam combiner 8a, from which one light beam that contains all image components exits. The optical output module 8 calibrates and adapts the light beam for reproduction on a screen/display 3b of the projection area. The light beam 3b of the right channel then hits the projection screen/display 6.

Both light beams for projection of the screen/display 3a and 3b are simultaneously reflected from the screen/display 6 toward the viewer as a final light beam 5 with a full 3D image.

The system can use the same passive 3D glasses as are used in the system with multiband interference filters from the state of the art.

An additional modification of the invention is the implementation of a projector that can optimally work for 2D and 3D projections. A projection system for both 3D channels can be put in one housing, with additional optical filters optimal for 2D projection.

In 3D operation mode, filters for 2D operation mode FR and FB at positions FRI and FB I, i.e. FR2 and FB2 are inactive, i.e. they are not positioned on the light's optical path. Filters for 3D operation mode FRI , FQI and FBI ; F ₂, F_G2 and FB₂ are active and are positioned on the light's optical path, and the projector functions equivalently to the aforementioned display.

In 2D operation mode, filters for 3D operation mode F I, FQI and F_Bi ; F_R2, FG₂ and F_B2 are inactive, i.e. they are not positioned on the light's optical path. Filters for 2D operation mode FR and FB are active and are positioned on the light's optical path, and the projector functions equivalently to the aforementioned display in figure 14, in respect to generating 2D images. The FQ filter is unnecessary since the green component results from the array of the F_R and FB filters, but can also be used for the better saturation of green color.

Taking onto account that filters for 2D operation mode pass a significantly larger amount of light, only one half of the projector system is therefore used, either only the upper portion with filters F_R and F_B and only the lamp 7, or only the lower portion with filters FR and F_B and the lamp 7.

For implementation with two projectors i.e. with two lamps, the electronic subsystem within the projector measures the operation time of both lamps 7, and balances the use of both 2D projection subsystems whereby both lamps are equally used.

The next significant possibility is an implementation where one lamp 7 is used, filters FR I and FBI operate in accordance to the aforementioned implementations, but filter FQI is used as a filter and a mirror, passing the Gl light spectrum toward its image modulator and reflecting remaining spectrum (which contains spectra R2, G2 and B2) toward the neighboring optical system with filters F 2, FB2 ad FQ2- In this manner, the radiating spectrum of lamp 7 is maximally utilized.

All implementations can use additional projectors for:

• Increasing brightness.

• Increasing gamut (ability to display a color spectrum) by using a device with additional lights bands.

• Realizing a larger image with parallel reproduction of numerous smaller portions of the entire reproduction.

The described implementations with two or more "standard" projectors may be realized with the installation of appropriate subsystems in one housing. Such products are known in the state of the art (e.g. LG CF3D projector), and some subsystems (e.g. output optics) can be jointly used for the left and right channels.

The novel solution of reproducing 3D color images using emissive displays refers to television screens and computer monitors, advertising panels and similar, which emit their own light (figure 1 1 ), in comparison to using projected light on a screen/display. For this implementation, a projection is unnecessary, due to the self-emission of light of each illuminated element of the emissive display during reproduction of the 3D color image. Such an emissive display 13 for reproducing 3D color images contains six or more elements usually called subpixels for each pixel, and each subpixel emits its own narrowband frequency light, which corresponds to multiband 3D glasses. The 3D image is obtained by appropriately driving the elements simultaneously for the left (P I , PQI and PBI) and the right (P ₂, P_G2 and PB2) eye inside each pixel 14.

The subpixels themselves can be such that because of their physical structure, they naturally produce a narrow spectrum of light (for example singleband LED diodes), or with subpixels emitting a wider spectrum of light in front of which narrowband singleband filters are positioned.

Reproducing a 3D color image on an emissive display 13 is executed with modulation of the monochromatic components of the image. This implementation consist of using six or more different selected narrowband frequencies of light, i.e. the appropriate monochromatic components of the color image (Rl , Gl, or B l ; R2, G2 or B2) three or more for each eye, whereby the mentioned monochromatic components of the color image can collectively reproduce the complete 3D color image visible with the use of appropriate 3D glasses, for example B l, Gl , Rl bands for the left eye and B2, G2, R2 bands for the right eye, and all of the monochromatic components of the 3D color image are simultaneously created on the display, either with the subpixels of a narrow light spectrum or with wideband subpixels in front of which the narrowband filters F are situated. Each individual pixel 14 on the emissive display 13 consists of six or more subpixels (PRI , PGI and PBI) and (PR2, PG2 and PB2) where three or more subpixels of a narrowband frequency of emitted light of an appropriately selected narrowband frequency of light Bl, Gl, Rl , B2, G2, R2 are used for each eye, thus creating six monochromatic components of the color image, by modulating the light's emitting power of each subpixel of the image (PRI , PQI and PBI) and (PR2, PG2 and PB2) in accordance with the contents of the appropriate portion of the 3D image. Advantages of this system in respect to existing displays of similar size are:

• More robust 3D glasses that do not contain electronics and do not require battery replacement; currently, the most frequent display implementations require active 3D glasses.

• Potentially, greater brightness in respect to displays that must share the same pixels through time for the successive reproduction of left and right images.

All implementation can use additional emissive pixels for:

• Increasing brightness.

• Increasing gamut (ability to display a color spectrum) by using additional frequencies of light bands.

5. Reproduction of 3D color images usins background optical guides for narrowband light

The novel solution for reproducing 3D color images with alternating lines and narrowband frequencies of light creates a 3D reproduction in the manner that one line (row or column) of pixels on the display emits the R1+G1+B1 light spectrum, the next line (row or column) emits the R2+G2+B2 light spectrum, and so on alternately.

The suitable electronic circuits execute the color correction of the 3D video signal input, and direct the video signal lines (rows or columns) onto the pixel matrix of the display, whereby e.g. the video signal for the left channel drives odd-numbered lines illuminated with the R1+G1+B 1 spectrum, and the video signal for the right channel drives even-numbered lines illuminated with the R2+G2+B2 spectrum.

This implementation is being characterized with the R1+G1+B1 light spectrum being generated either by the white light source 2 and passage through narrowband filters F, or by narrowband light sources, or by another suitable combination of light sources and narrowband filters; the passage and direction of such a light 2p through the optical guide 16a for illuminating the pixel 14 matrix, which is optically insulated with a material 20 from the optical guide of the second channel 16b, and the R2+G2+B2 light spectrum is generated from the same or another light source of the same kind as is the case for the first channel, with the passage and direction of such a light through another optical guide 16b for illuminating the pixel 14 matrix, optically insulated with a material 20 from the optical guide of the first channel 16a, where for example, the first optical fiber 16a illuminates all odd-numbered lines (rows or columns) of the pixel 14 matrix, and the second optical fiber 16b illuminates all even-numbered lines (rows or columns) of the pixel 14 matrix of the emissive display 13.

The viewer is located at a sufficiently large (standard) distance from the display and therefore is not capable of precisely differentiating the individual lines of the image and wears glasses where one side passes only the R1 +G1 +B1 light spectrum (i.e. R1+G1+B 1 narrowband frequencies of light) to one eye, and the other side passes only the R2+G2+B2 light spectrum to the other eye. The viewer effectively sees two different images with each eye, in full color spectrum, i.e. sees a 3D image.

This reproduction method requires a double resolution display (for example 3840x 1080) in order for both channels to simultaneously reproduce full resolution images (for example 1920x 1080 for the left channel and 1920x 1080 for the right channel). However, such displays, as well as more cost-effective solutions where single resolution displays are used (e.g. 1920^χ 1080), and 3D video is reproduced in partial (halved) resolution for each eye (e.g. 1920x540 for the left channel + 1920x540 for the right channel) are known from the state of the art. Moreover, the glasses are also known from the state of the art, as well as generation of the described light spectrum (with narrowband light sources such as lasers, or wideband light sources with narrowband filters).

The advantages of such a system of 3D image reproduction are:

• A display with a fast LCD matrix is not necessary, as is necessary for systems with active electronic glasses where images for the left and right eye are successively alternated on the same display;

• Most of the system's elements are known within the state of the art;

• The viewing angle is very wide, color is true and saturated.

A possible implementation, illustrated on image 15, consists of using two sources of backlight 7 for illuminating the display's matrix of semi-transparent pixels 15, for example LCD technology, and two mutually corresponding optically insulated optical guides 16a and 16b which lead the light from the two light sources 7 to the matrix so that one optical guide 16a illuminates all even-numbered lines (rows or columns) 17, and the other optical guide 16b illuminates all odd-numbered lines (rows or columns) 18. The spectrum of one light source 7, specifically in respect to the display, contains light of wavelengths Rl, Gl and Bl, created by passage through the multiple narrowband filter FRI_+GI₊BI, and the spectrum of the other light source 7 contains light of wavelengths R2, G2 and B2, created by passage through the multiple narrowband filter F_R2+G2+B2-

The multiple narrowband filters F_Ri_+G|_+Bi and F_R2₊G2₊B2 can be implemented as a series of suitable narrowband filters for individual desired frequencies of light bands (FRI , FGI and FBI ;

Upon passage through the display's pixels 14 for the purpose of image modulation, the modulated light 5 of the R1+G1+B1 spectrum and the modulated light 5 of the R2+G2+B2 spectrum travel toward the viewer who sees a 3D image, as shown on figure 16.

Optical guides 16a and 16b must be optically insulated with a suitable material 20 e.g. an opaque paint or a metallic foil, in order to prevent the "leakage" of light into the opposing channel.

The required optical spectra for entry light of the optical guides can be achieved with the use of wideband sources of white light and multiple narrowband filters, or with the use of narrowband light sources, or another suitable combination of lights sources and filters.

This solution is suitable e.g. for LCD displays that have backlight. 6. Reproduction of 3D color images using narrowband filters arranged in a series with a pixel matrix

The following solution consists of the use of multiple narrowband filters in a series with pixels on a display. A filter for the R1+G1+B 1 spectrum is located on the light path of one line (row or column), and a filter for the R2+G2+B2 spectrum is located on the light path of the next line (row or column), and so on alternately. The light generated by each pixel, upon passage through one of the filters, heads toward the viewer.

This implementation of reproducing a 3D color image with alternating lines and narrowband frequencies of light is executed whereby each pixel 14 on the emissive display 13, indirectly with backlight or directly with its own illumination, generates or emits light (the wider R+G+B light spectrum), and the light from a pixel 14 of the first line (row or column) passes through a multiple narrowband filter FRI₊GI₊BI, and the light from a pixel 14 of the second line (row or column) passes through a multiple narrowband filter F_R2+G2₊B2, and so on alternately, or in reverse where the light can first pass through the filters FRI+GI+BI and FR2+G2+B2, and then through the pixels 14 of the emissive display 13.

Filters FR I₊GI₊BI and F_R2KJ2₊B2 can be positioned in front of and behind the pixel 14 matrix. It is important only that the light serially passes through the filters and through their corresponding appropriate even- 17 or odd- 18 numbered lines (rows or columns).

On figure 17, the implementation where the pixel 14 matrix for image modulation, e.g. a plasma display 13, is located behind the filter is illustrated. Light from each pixel 14 is emitted in the direction of the viewer. The filter for the R1+G1+B 1 spectrum F_RI_+G I₊B I is located in front of the first row of pixels, the filter for the R2+G2+B2 spectrum F_R2₊G2₊B2 is located in front of the second row of pixels, and so on alternately. After passage through the filters, the modulated light 5 with the image contents of the R1 +G1+B1 and R2+G2+B2 spectra continues toward the viewer, who sees a 3D image.

Some possible below-mentioned implementations where this solution is suitable for use are shown in figure 19.

Regarding the system in figure 19a with the display where each pixel produces its own light (e.g. plasma), filters F must be situated in front of the pixels. The ray of light 5 as seen by an observer is emitted from the display of such a system by the pixels 14 on the emissive display 13 being activated. The image is modulated by changing the illumination intensity of the pixels 14. Light further passes through a transparent base with R1+G1 +B1 and R2+G2+B2 filters F, suitable for pixels of the left and right channels, and finally toward the viewer.

For a display system using backlight (e.g. LCD), the filters F can be in front of (figure 19a) or behind (figure 19b) the pixel 14 matrix. The ray of light 5 generated with backlight 21 , passes through pixels 14 that modulate the image in the manner that they pass more or less light through the semi-transparent display 15, then through the filter F or in reverse order through the filter F and then through the pixels 14, and finally toward the viewer.

The described solution with the alternating filters can be used with projectors, whereby the transparent base with filters (or numerous bases with filters, if such is appropriate for the individual structure of a projector) is located on the light path that passes through the modulation chip or chips, aligned with the pixels of the image in the described manner. An example of one possible implementation as shown on figure 19d was executed so that light 2 generated by a projector lamp 7 first passes through filter F, then through the image modulator M i.e. the modulation pixel 14 matrix of the projectors, and finally toward the optical output module 8 of the projector and toward the viewer.

Taking into account that the mask with filters can be situated in front of the existing 2D pixel matrix (e.g. existing 2D televisions), implicitly including the fact that the filters and pixel lines on the display must thus coincide, the existing displays can possibly be redesigned into 3D displays, as opposed to the production of completely new systems.

An example of the construction of parallel R1+G1+B 1 and R2+G2+B2 filters e.g. for a plasma display is illustrated in figure 18. A filter thus arranged that effectively covers the entire display can be made from numerous smaller filters, or from a combination of a standard fabrication of interference filters (vapor deposition of metallic layers in a vacuum) and processes known in chip manufacturing (masking, etching). The process of fabricating such a filter is as follows:

• in the 1^st phase, a temporary protective layer 22 is applied onto the emissive display 13 or onto another transparent base which will ultimately be located in front of the display 13. This layer covers all areas, rows or columns, through which the pixels of the even- numbered lines 17 that must use the R2+G2+B2 spectrum will ultimately be visible;

• in the 2^ND phase, filters for the R1+G1+B 1 spectrum for the entire base are applied to such a base by vaporization or another appropriate process, both on areas where the filter F_{R 1 +}GI₊BI is to be ultimately located, and the same is applied to areas where such is not desired;

• in the 3^rd phase, the temporary protective layer 22 from phase 1 is removed, and therewith the "incorrect" R1 +G1 +B 1 Filter;

• in the 4^TH phase, a new temporary protective layer 22 is applied on all areas, rows and columns, through which pixels of odd-numbered lines 18 that must use the R1 +G1+B 1 spectrum will ultimately be visible;

• in the 5^TH phase, filters for the R2+G2+B2 spectrum for the entire base are applied to such a base, and to areas where the filter F 2+G2+B2 is to be ultimately located, as well as to areas where such is not desired;

• in the 6^TH phase, removal of the temporary protective layer 22 and therewith the "incorrect" R2+G2+B2 filter results in the display/base with the desired filters FR_{I +}QI₊BI and F_R2+G2+B2 at the desired positions.

It is understood that the process is executed simultaneously for the entire display. The space between the filters themselves, which certainly must be as small as possible as it is desired that as much light as possible passes through the filters toward the viewer, must not reflect or pass light.

A filter constructed in this manner is placed in front of an emissive display 13, and the alternating array of the filters and image pixels is illustrated in figure 17.

Method of utilizing the invention

The method of industrial utilization of the subject invention is regarded as generally known and currently a wide technical field with extremely dynamic development, as well as production and use of projectors and accompanying equipment for the reproduction of 3D color images on a screen/di splay using a projection system, as well as the reproduction of 3D color images on emissive displays as are found on television sets, computer monitors and illuminated advertisements.

An expert in this technical field will understand that the stated implementation examples are mentioned for the purpose of explanation, and that combinations of the stated methods of creating monochromatic components of a color image and the reproduction thereof can be used, on an emissive display and by projection on a screen.

In respect to currently known state of the art and technology in the technical field of the subject invention, the industrial use of the subject invention neither requires any new materials nor technological processes and procedures.

LIST OF REFERENCED DESIGNATIONS

1 - projector

2 - white light

2M - modulated white light

2_F - filtered light

2| F - filtered and modulated light

F - filter or filter assembly

3, 3a, 3b - light for reproduction on a screen/display

4 - 3D glasses

5 - light reflected from the screen/display, or emitted from a display, toward the viewer

6 - projection screen/display

7 - lamp, white light source

8 - optical output module = 8a+8b

8a - beam combiner

8b - output optics

9 - reflector

10 - Fresnel lenses

1 1 - optical splitting system

12a, 12b, 12c - mirror

13 - emissive display

PR U PGI . PB I - subpixels for the left eye

PR2, PG2, PB2 - subpixels for the right eye

14 - pixel

15 - semi-transparent display

16a and 16b - optically insulated optical guides

17 - even-numbered lines

18 - odd-numbered lines

20 - insulating material between optical guides

21 - backlight

22 - temporary protective layer

25 - thermal mirror

Claims

PATENT CLAIMS

1. The system for reproducing a 3D color image using modulation of monochromatic components of the image, which consists of using six or more different selected narrowband frequencies of light (Rl , Gl , Bl ; R2, G2, B2) generated by using a projector lamp (7), i.e. appropriate monochromatic components of the color image, three or more for each eye, in the manner that the selected monochromatic components of the color image can collectively reproduce a complete 3D color image on a projection screen/display (6) visible by using suitable 3D glasses (4), for example Bl, Gl , Rl bands for the left eye and B2, G2, R2 bands for the right eye, where the reproduction of the 3D color image is achieved whereby a light beam (2) passes through a filter F and through an image modulator M, and passes through an optical output module (8), which creates light for reproduction on a screen/display (3a and 3b), and is then projected on a screen/display (6) is characterized by that the filters F are implemented as narrowband singleband filters, and for each of the primary colors R, G and B at least one pair of the mentioned filters (FRI , FGI and FBI ; FR₂, FG2 and FB₂) exists.

2. The system according to patent claim 1 , is characterized by that for each of the mentioned pairs of filters (FRI, FGI and FBI ; F 2, FQ₂ and F_B2), three filters for the basic colors R, G and B serve for filtering white light (2) for the left eye, and the other three filters for the basic colors R, G and B serve for filtering white light (2) for the right eye.

3. The system according to patent claim 1 , is characterized by that all individual light beams (2) simultaneously pass through the system, where each invidual light beam (2) first passes through one narrowband singleband filter F, then through one image modulator M, or in reverse order, thus each creating one monochromatic component of the color image Rl, Gl or Bl , i.e. R2, G2 or B2, whereby all individual monochromatic components of the color image are simultaneously created and then simultaneously projected onto the screen/display (7).

4. The system according to patent claim 1, is characterized by that the creation of monochromatic components of a color image is executed in temporal sequence whereby the light beam (2) first passes through one of six or more appropriate narrowband singleband filters (FRI , FQI and FBI; FR₂, FQ₂ and F_B2) positioned on the mobile filter assembly (F), and then through one modulator (M), or in reverse order, always in the manner that the filters (FRI, FQI and FB I ; FR₂, FQ₂ and F_B2) interchange in temporal sequence on the path of the light beam (2) where individual monochromatic components of the image (Rl, Gl , B l, R2, G2 or B2) for the complete color image are modulated when the stated modulator (M) is aligned with the physical position of appropriate narrowband singleband filter (FRI or FQI or FBI or FR₂ or FQ₂ or FB₂) on the path of the light beam (2), and the exchange frequency of various monochromatic components of an image must be sufficiently high for reproduction without flickering.

5. The system according to patent claim 4, is characterized by that the mobile filter assembly (F), can contain a larger number of the same filters for the purpose of improving the manner of creating individual monochromatic components of a color image, i.e. in order to increase the occurrence frequency of an individual narrowband singleband filter (FRI or FGI or FBI or FR₂ or FG₂ or FB₂) in front of the light beam (2) (figure 9e), or the system can contain different number of mobile assemblies (F) and modulators M.

6. The system according to patent claim 1 , is characterized by that the reproduction of the 3D color image is achieved by reflection and transmission through interference filters whereby a white light beam is split into narrowband beams Rl , Gl , B l , and R2, G2, B2 by passing through singleband interference filters (F I , FGI and FBI ; FR₂, FG₂ and FB₂) and reflection of the impermeable spectrum portion of the particular beams of the filter, and reflection from mirrors (12a, 12b, 12c), which further pass through the image modulators (M), creating individual monochromatic components of the image (Rl, Gl and Bl ; R2, G2 and B2), and furthermore the created monochromatic components of the image (R 1 , Gl and Bl ; R2, G2 and B2) upon passage through the optical output module (8) are projected as light for reproduction (3a and 3b) on a screen/display (6).

7. The system according to any of the previous claims, is characterized by that primary color wideband filters for the reproduction of 2D color images (FR, FQ and FB) can optionally be installed, which offers the possibility of achieving an optional system for reproducing 3D and 2D color images, so that in the event where light beams pass through image modulators (M) and pass through narrowband singleband filters (FR I , FG I and FBI ; F 2, FQ2 and FB₂), then 3D color image reproduction is achieved, while in the event where light beams pass through image modulators (M) and only pass through primary color wideband filters (FR, FG and FB), then 2D color image reproduction is achieved.

8. The system for reproducing a 3D color image using modulation of monochromatic components of the image, which consists of using six or more different selected narrowband frequencies of light (Rl , Gl , Bl ; R2, G2, B2) generated by using an emissive display ( 13), i.e. appropriate monochromatic components of the color image, three or more for each eye, in the manner that the selected monochromatic components of the color image can collectively reproduce a complete 3D color image visible by using suitable 3D glasses, for example Bl, Gl, Rl bands for the left eye and B2, G2, R2 bands for the right eye, is characterized by that all monochromatic components of the 3D color image are simultaneously created on the display by pixels (14) whereby each pixel consists of six or more subpixels (PRI, PQI, PBI , PR2, PG2, PB2) where each subpixel is modulating the emitting power of the light of one selected narrowband frequency in accordance with the contents of the appropriate portion of the 3D image.

9. The system for reproducing a 3D color image according to patent claim 8, is characterized by that each individual subpixel (PRI , PQI , PBI , PR2, PG2, PB₂) on the emissive display is emitting either one selected narrowband light spectrum or wideband light spectrum, in front of which the appropriate narrowband filter F is situated..

10. The system for reproducing a 3D color image using alternating lines and narrowband frequencies of light according to patent claim 8, is characterized by that light of the R1+G1+B1 spectrum is created from the white light source (2) and by passage through narrowband filters F, or from narrowband light sources, or from another combination of light sources and narrowband filters, by passage and direction of such a light (2M) through the optical guide (16a) for illuminating the pixel (14) matrix, optically insulated with a material (20) from the optical guide of the second channel ( 16b), and the R2+G2+B2 light spectrum is created from the same or different identical light source as is the case for the first channel, by passage and direction of such a light through another optical guide (16b) for illuminating the pixel (14) matrix, optically insulated with a material (20) from the optical guide of the first channel (16a), where for example, the first optical guide ( 16a) illuminates all odd-numbered lines (rows or columns) of the pixel (14) matrix, and the second optical guide ( 16b) illuminates all even-numbered lines (rows or columns) of the pixel (14) matrix of the emissive display (13).

1 1. The system for reproducing a 3D color image using alternating lines and narrowband frequencies of light according to patent claim 8, is characterized by that each pixel (14) on the emissive display ( 13) indirectly with backlight or directly with its own illumination, generates or emits light (containing wider R+G+B light spectrum), and the light from a pixel (14) of the first line (row or column) passes through a multiple narrowband filter F_Ri_+G i_+Bi, and the light from a pixel ( 14) of the second line (row or column) passes through a multiple narrowband filter F_R2₊G2+B2, an so on alternately, or in reverse where the light can first pass through the filters FR I +G I+B I and F 2+G2+B2, and then through the pixels ( 14) of the emissive display (13).

12. The system for reproducing a 3D color image according to patent claim 1 or 8, is characterized by that filters (F) for narrowband frequencies R1 +G1+B 1 and R2+G2+B2, i.e. a transparent base with alternately positioned filters or other appropriate bearing construction, are located on the light path (2), which is processed by one or more modulation chips (M) for creation of an image inside the projector (1 ) in the manner that lights rays (2) that belong to individual pixels ( 14) pass through their appropriate filter (F) and through the area belonging to their appropriate pixel ( 14) of one or more modulation chips (14), i.e. the lines and their appropriate filters (F) must be precisely aligned.

13. The system for reproducing a 3D color image using alternating lines and narrowband frequencies of light according to patent claim 8 or 12, is characterized by that for the redesign of existing displays into 3D systems, a mask with filters can be situated in front of the existing 2D pixel matrix, for example existing 2D televisions, whereby filters (F) and pixel lines ( 14) on the display must thus coincide

14. The system according to patent claim 1 or 8, is characterized by that of six or more different selected narrowband frequencies of light, at least one narrowband of light for the left eye (Bl) as well as at least one narrowband of light for the right eye (B2) must be inside the band of the blue color spectrum (B), and that at least one narrowband of light for the left eye (Rl ) as well as at least one narrowband of light for the right eye (R2) must be inside the band of the red color spectrum (R), and at least one narrowband of light for the left eye (Gl) as well as at least one narrowband of light for the right eye (G2) must be inside the band of the green color spectrum (G).

15. The system according to patent claim 1 or 8, is characterized by that the stated system can be used for reproducing 2D color images if appropriate 3D glasses (4) are not used.