WO2013182018A1 - Black projection screen - Google Patents

Description

 Black projection screen

[Technical Field]

The present invention relates to the field of projection display technology, and in particular to a black projection screen.

 【Background technique】

Due to the influence of stray light formed by the reflection of ambient light on the black projection screen, the contrast and color reproduction of the projection light on the existing black projection screen is greatly reduced, which affects the image projection effect, especially for ambient light. Demanding projection projectors, projection projectors, projection televisions, etc., are generally only used under conditions of low ambient light, limiting the range of use of these projection devices.

Therefore, it is necessary to provide a black projection screen to solve the above technical problems.

 [Summary of the Invention]

The invention provides a black projection screen, wherein the black projection screen can make the light of the primary light wavelength range of the projected light incident thereon substantially totally reflected, and is incident on the natural light on the black projection screen. Most of the light is absorbed, which effectively improves the contrast and color reproduction of the black projection screen.

In order to solve the above technical problem, one technical solution adopted by the present invention is to provide a black projection screen.

The black projection screen comprises: an optical film having opposite first and second surfaces, the optical film for reflecting light of a range of primary light in the projected light and transmitting light of other wavelength ranges, Wherein, the optical film is formed by a plurality of different reflective films different from each other, the multi-layer reflective film comprising: a red reflective film reflecting red light, a green reflective film reflecting green light, and a blue reflective film reflecting blue light. a black light absorbing layer disposed on the second surface for absorbing light incident thereon; a transparent substrate disposed on the first surface of the optical film, and the transparent substrate is transmissive Light incident on it.

Wherein, the multilayer reflective film further comprises: a yellow light reflecting film that reflects yellow light.

Wherein, the multilayer reflective film further comprises: a cyan reflective film that reflects cyan light.

Wherein, the multilayer reflective films are disposed in contact with each other.

Wherein, the multilayer reflective film is sequentially plated on the black light absorbing layer.

The multilayer reflective film is sequentially plated on the transparent substrate.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a black projection screen, comprising: an optical film having opposite first and second surfaces for reflecting a primary color in the projected light Light in a range of wavelengths of light and light in other wavelength ranges; a black light absorbing layer disposed on the second surface for absorbing light incident thereon; wherein the optical films are different from each other The multilayer reflective film is formed.

Wherein, the multilayer reflective film comprises: a red light reflecting film that reflects red light, a green light reflecting film that reflects green light, and a blue light reflecting film that reflects blue light.

Wherein, the multilayer reflective film further comprises: a yellow light reflecting film that reflects yellow light.

Wherein, the multilayer reflective film further comprises: a cyan reflective film that reflects cyan light.

The black projection screen further includes a transparent substrate disposed on the first surface of the optical film, and the transparent substrate transmits light incident thereon.

Wherein, the multilayer reflective films are disposed in contact with each other.

Wherein, the multilayer reflective film is sequentially plated on the black light absorbing layer.

The multilayer reflective film is sequentially plated on the transparent substrate.

The invention provides a black projection screen, wherein a black light absorbing layer is disposed on the optical film, so that the light of the range of the primary light in the projected light incident on the black projection screen is almost totally reflected, and is incident on the black projection screen. Most of the light in the natural light is absorbed, which effectively improves the contrast and color reproduction of the black projection screen image, thereby expanding the use of the black projection screen.

 [Description of the Drawings]

1 is a schematic structural view of a first embodiment of a black projection screen of the present invention;

Figure 2 is a schematic view showing a structure of the optical film 11 of Figure 1;

3 and FIG. 4 are schematic diagrams showing the projection principle of the black projection screen 10 shown in FIG. 1 including the optical film 11 shown in FIG. 2;

Figure 5 is a schematic view showing the structure of a second embodiment of the black projection screen of the present invention.

 【detailed description】

Please refer to FIG. 1. FIG. 1 is a schematic structural view of a first embodiment of a black projection screen of the present invention. As shown in FIG. 1, the black projection screen 10 of the present embodiment includes an optical film 11 and a black light absorbing layer 12. The optical film 11 has opposing first and second surfaces, wherein the first surface faces an incident direction of the projected light. The optical film 11 is for reflecting light of a range of fundamental light in the projected light and light of other wavelength ranges, and the optical film 11 is formed of a plurality of reflective films different from each other. The black light absorbing layer 12 is disposed on the second surface of the optical film 11, and the black light absorbing layer 12 serves to absorb light incident thereon.

In the first embodiment of the present invention, the plurality of reflective films may be disposed in contact with each other, or may be sequentially plated on the black light absorbing layer 12. Of course, in other embodiments of the present invention, the multilayer reflective film may have other arrangements, which are not limited in the present invention.

Referring to FIG. 2, FIG. 2 is a schematic view showing a structure of the optical film 11 of FIG. 1. As shown in FIG. 2, the optical film 11 includes a first light reflecting film (not shown), a second light reflecting film (not shown), and a third light reflecting film (not shown). The first reflective film is a red light reflecting film 111, the second light reflecting film is a green light reflecting film 112, and the third light reflecting film is a blue light reflecting film 113, as viewed in an incident direction of the projected light. Of course, in view of the incident direction of the projected light, the first reflective film, the second reflective film, and the third reflective film may be red reflective film, green reflective film, and blue reflective film in addition to the red, green, and blue (RGB) mode. Any combination mode, such as red blue green (RBG) mode and blue red green (BRG) mode, will not be repeated here.

The optical film 11 in the first embodiment of the present invention may further include a fourth light reflecting film (not shown), and the fourth light reflecting film is a yellow light reflecting film (not shown). Correspondingly, the combination mode of the first light reflecting film, the second light reflecting film, the third light reflecting film and the fourth light emitting film is a red light reflecting film 111, a green light reflecting film 112, and a blue light reflecting, as viewed in an incident direction of the projected light. Any combination mode of the film 113 and the yellow light reflecting film, such as red green blue yellow (RGBY) mode and red yellow blue green (RYBG) mode.

The optical film 11 in the first embodiment of the present invention may further include a fourth light reflecting film (not shown) and a fifth light reflecting film (not shown), wherein the fourth light reflecting film is a yellow light reflecting film, and the fifth The reflective film is a cyan reflective film. Correspondingly, the combination mode of the first light reflecting film, the second light reflecting film, the third light reflecting film, the fourth light emitting film and the fifth light reflecting film is a red light reflecting film 111 and a green light reflecting direction as viewed in an incident direction of the projected light. Any combination mode of the film 112, the blue light reflecting film 113, the yellow light reflecting film, and the cyan light reflecting film, for example, a red green blue yellow green (RGBYC) mode and a green red yellow blue (GRYCB) mode.

In an embodiment of the invention, the red reflective film is used to reflect red light, the green reflective film is used to reflect green light, the blue reflective film is used to reflect blue light, and the yellow reflective film is used to reflect yellow light and blue light. The reflective film is used to reflect cyan light.

In the first embodiment of the present invention, the final color pattern formed by the projection light is determined by a combination of primary color rays of a specific wavelength. For example, in a laser projection display, the laser light source and the fluorescent color wheel determine a specific wavelength range in the projected light. The primary light, which in turn determines the color pattern of the projected light. After the projected light and the natural light are incident on the black projection screen 10, the optical film 11 selectively reflects the light of the range of the primary light rays in the projected light and the light of the other wavelength range, wherein the light transmitted through the optical film 11 is absorbed by the black light. Layer 12 is absorbed.

Please refer to FIG. 3 and FIG. 4. FIG. 3 and FIG. 4 are schematic diagrams showing the projection principle of the black projection screen 10 shown in FIG. 1 including the optical film 11 shown in FIG. 2.

For example, the projected light incident on the black projection screen 30 is a colored light formed by mixing three primary colors of red light, green light, and blue light. As shown in FIG. 3, after the projection light is incident on the optical film 11, the red light of a specific wavelength range is almost totally reflected by the red light reflecting film, and the light of other wavelengths enters the next reflective film; the green light of a specific wavelength range is green light. The reflective film is almost totally reflected, and the remaining blue light of a specific wavelength is almost completely reflected by the blue light reflecting film. Therefore, the projection light incident on the black projection screen 10 is almost RGB Reflective film total reflection.

In practical applications: the red reflective film only reflects more than 95% of the red light in a specific wavelength range (such as red light with a wavelength range of 635 nm ± 10 nm) in the projected light, and transmits light in other wavelength ranges. The rate is over 95%; the green reflective film only reflects more than 95% of the green light of a specific wavelength range in the projected light (such as green light with a wavelength range of 540 nm ± 10 nm), and the light of other wavelength ranges. The transmittance is over 95%; the blue light reflecting film only reflects the blue light of a specific wavelength in the projected light (such as blue light with a wavelength range of 435 nm ± 10 nm) as high as 95% or more, and is transparent to other wavelengths. The rate of overreach is over 95%.

As shown in FIG. 4, natural light (ambient light) is incident on the black projection screen 10 while the projection light is incident on the optical film 11. Among them, natural light is composed of continuous wavelengths of light, and only a small part of the natural light has a wavelength range consistent with the wavelength range of the primary light in the projected light, so only a small part of the natural light is reflected by the black projection screen 10, and large Part of the light is transmitted and then absorbed by the black light absorbing layer 12.

As shown in FIG. 3 and FIG. 4, the black projection screen 10 shown in FIG. 1 of the optical film 11 including the structure shown in FIG. 2 can effectively reduce the influence of ambient light on the projected light, thereby improving the black projection screen 10. The contrast of the image, the color reproduction, and the projection viewing effect can further expand the range of use of the black projection screen of the present invention.

Of course, the projection principle of the black projection screen 10 of the optical film 11 of the present invention having other structures is similar to the projection principle shown in FIGS. 3 and 4, and details are not described herein again.

Referring to FIG. 5, FIG. 5 is a schematic structural view of a second embodiment of a black projection screen of the present invention. As shown in FIG. 5, the black projection screen 20 of the present embodiment is different from the black projection screen 10 of the first embodiment in that the black projection screen 20 further includes a transparent substrate 23, wherein the transparent substrate 23 is disposed on the optical film 21. On the first surface, and the transparent substrate 23 transmits light incident thereon.

In the second embodiment of the present invention, the multilayer reflective film may be sequentially plated on the transparent substrate 23. The transparent substrate 23 may be a flexible transparent substrate or a rigid transparent substrate such as a glass substrate.

In the above manner, the present invention provides a black projection screen, by providing a black light absorbing layer on the optical film, so that the light of the primary light ray in the projected light incident on the black projection screen is almost totally reflected and incident. Most of the light in the natural light on the black projection screen is absorbed, which effectively improves the contrast and color reproduction of the black projection screen image, thereby expanding the use range of the black projection screen.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (14)

A black projection screen, characterized in that the black projection screen comprises: An optical film having opposing first and second surfaces, the optical film for reflecting light of a range of primary light in the projected light and for transmitting light of other wavelength ranges, wherein the optical film is Forming a multi-layered reflective film different from each other, the multi-layer reflective film comprising: a red light reflecting film that reflects red light, a green light reflecting film that reflects green light, and a blue light reflecting film that reflects blue light; a black light absorbing layer disposed on the second surface for absorbing light incident thereon; A transparent substrate disposed on the first surface of the optical film, and the transparent substrate transmits light incident thereon. The black projection screen according to claim 1, wherein the multilayer reflective film further comprises: a yellow light reflecting film that reflects yellow light. The black projection screen according to claim 2, wherein the multilayer reflective film further comprises: a cyan reflective film that reflects cyan light. The black projection screen according to any one of claims 1 to 3, wherein the plurality of reflective films are disposed in contact with each other. The black projection screen according to any one of claims 1 to 3, wherein the multilayer reflective film is sequentially plated on the black light absorbing layer.  The black projection screen according to claim 3, wherein the plurality of reflective films are sequentially plated on the transparent substrate. A black projection screen, characterized in that the black projection screen comprises: An optical film having opposing first and second surfaces, the optical film for reflecting light of a range of primary light in the projected light and transmitting light of other wavelength ranges; a black light absorbing layer disposed on the second surface for absorbing light incident thereon; Wherein, the optical film is formed of a plurality of multilayer reflective films different from each other. The black projection screen according to claim 7, wherein the multilayer reflective film comprises: a red light reflecting film that reflects red light, a green light reflecting film that reflects green light, and a blue light reflecting film that reflects blue light. The black projection screen according to claim 8, wherein the multilayer reflective film further comprises: a yellow reflective film that reflects yellow light. The black projection screen according to claim 9, wherein the multilayer reflective film further comprises: a cyan reflective film that reflects cyan light. The black projection screen according to claim 7, wherein the black projection screen further comprises: a transparent substrate disposed on the first surface of the optical film, and the transparent substrate transmits light incident thereon . The black projection screen according to any one of claims 7 to 11, characterized in that the plurality of reflective films are disposed in contact with each other. The black projection screen according to any one of claims 7 to 11, wherein the multilayer reflective film is sequentially plated on the black light absorbing layer. The black projection screen according to claim 11, wherein the plurality of reflective films are sequentially plated on the transparent substrate.

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