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WO2005071471A1 - Affichage a fibres optiques en mosaique - Google Patents

Affichage a fibres optiques en mosaique Download PDF

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Publication number
WO2005071471A1
WO2005071471A1 PCT/CA2005/000050 CA2005000050W WO2005071471A1 WO 2005071471 A1 WO2005071471 A1 WO 2005071471A1 CA 2005000050 W CA2005000050 W CA 2005000050W WO 2005071471 A1 WO2005071471 A1 WO 2005071471A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
optical
liquid crystal
modulator
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA2005/000050
Other languages
English (en)
Inventor
Adrian Kitai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
McMaster University
Original Assignee
McMaster University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by McMaster University filed Critical McMaster University
Priority to US10/587,334 priority Critical patent/US8723779B2/en
Priority to CA2555375A priority patent/CA2555375C/fr
Publication of WO2005071471A1 publication Critical patent/WO2005071471A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/305—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being the ends of optical fibres
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G09F9/3026—Video wall, i.e. stackable semiconductor matrix display modules

Definitions

  • the present invention relates to a tiled optical fiber display.
  • Liquid crystal (LC), light emitting diode (LED) and plastic optical fibre (POF) technologies are combined in a unique way to form full colour displays.
  • Remarkable progress in LED technology has recently enabled high efficiency red, green and blue light sources with lifetimes of 100,000 hours. These are in current use for very large outdoor video displays (diagonal size of 20 ft, for example) with pixel spacings >2 cm, where the high cost of assembling from -100,000 to ⁇ 1 ,000,000 LEDs is warranted. (Cost from $50,000 to $1 ,000,000or more.) In many applications, this is not affordable, particularly where a large number of pixels is desired.
  • Display Solution Needham, B., Information Display 10, pages 20-24, 2003, discloses an optical fiber-based display technology and application in public information displays and advertising.
  • a major issue with this approach is the loss of light associated with the LCD device. Typically only 5% of the light is used, and the remaining 95% is absorbed by components of the LCD.
  • Another issue is the strict requirement for exact alignment of the LCD units where an array of LCD units is tiled together to produce the desired display size. This generally requires that the image size of each LCD unit be expanded, allowing seamless tiling of the LCD units.
  • WO/03/067318 discloses a Tiled Display with Filter for Uniform Pixel Brightness which comprises an image display device having an array of electrically driven picture elements which are viewable at a viewing surface. Luminance corrections are arranged with respect to the image display device so as to apply a spatial luminance filter to the output of the image display device, the spatial luminance filter attenuating the light output by each picture element of the image display device in substantially inverse relation to the luminance response characteristics of the picture element so that each picture element exhibits substantially the same luminance for a given input electrical driving signal.
  • WO/03/067563 discloses a Display with Optical Fibre Face Plate which comprises an array of pixel elements; and an image guide having an array of light transmission guides, input ends of the light transmission guides being arranged to receive light from pixel elements of the image display device.
  • Output ends of the light transmission guides provide an image output surface.
  • Each light transmission guide includes a light-guiding region to promote light propagation by total internal reflection and a reflective coating on the light guiding region to promote specular reflection at the region-coating interface. Therefore, it would be very advantageous to provide a tiled optical fiber display device structure in which the image size of a LCD display is expanded, enabling any desired number of LCD displays to be tiled together without gaps between them, so as to create a seamless picture, with superior display brightness and colour quality achieved due to backlighting with LED lamps and eliminating the need for light absorbing colour filters.
  • the present invention provides a tiled optical fiber display device structure which includes a light emitting diode (LED) backlit liquid crystal display (LCD).
  • LED light emitting diode
  • LCD liquid crystal display
  • Light from the LCD enters an array of optical fibers that directs the light to a viewing screen.
  • the optical fibers are arranged so as to eliminate the use of energy absorbing colour filters in conventional LCD's, and also to enable the seamless tiling of display modules.
  • the present invention provides a tiled optical display, comprising: at least one display module including i) a liquid crystal display and an array of light emitting diodes positioned to backlight the liquid crystal display, the array of light emitting diodes including at least one each of red, green and blue wavelength emitting light emitting diodes with a beam of light from each light emitting diode being focussed onto a pre-selected region of the liquid crystal display spaced from the light emitted by the other light emitting diodes, each pre-selected region of the liquid crystal display including an array of optical modulation elements such that light from each beam of light passes through one set of corresponding optical modulation elements, control means connected to each individual modulation element of each set of optical modulation elements for controlling a desired amount of light from each beam to pass through each individual optical modulation element of the liquid crystal modulator; and ii) a planar viewing plane having a pre-selected number of pixels, each individual optical modulation element having a first end of an optical fiber optically coupled thereto, and a
  • Figure 1 is schematic diagram of a tiled optical fiber display produced in accordance with the present invention.
  • Figure 2 is a LED placement diagram, showing layout of 72 LEDs each having two leads (all dimensions in mm), each LED only emits light having one of three possible colours, namely red, green or blue, each triangle formed by three neighbouring LEDs is comprised of a red, a green and a blue- emitting LED.
  • Figure 3 shows hole locations in a first optical fiber retaining plate through which the optical fibers are inserted.
  • Figure 4 shows hole locations in a second optical fiber retaining plate through which the optical fibers are inserted.
  • Figure 5 shows an example of correspondence of holes in the first optical fiber retaining plate of Figure 3 with the holes in second optical fiber retaining plate.
  • the left side of the Figure shows fiber locations of the first plate, and a right portion showing fiber locations of the second plate.
  • the three (3) fibers that end in the 3 locations of the second plate shown generally at 1 form a triangular pattern, and originate from the three locations, each shown as 1 in the first plate. Of the said three fibers, one is illuminated with green light, one with red and the other with blue.
  • Figure 1 shows an example of a display 10 constructed in accordance with the present invention.
  • a red, a green and a blue-emitting light emitting diode (LED) at 12, 14 and 16 respectively are supplied with a steady direct electric current (DC) to provide steady illumination.
  • Focused LED's are preferred from which a light beam is emitted in a cone 18 of a particular colour from each LED with a typical divergence angle of ⁇ 15°.
  • Light from each LED 12, 14, and 16 illuminates only a desired portion 24, 26 and 28 respectively of a liquid crystal display (LCD) modulator 20 so that light of only one colour from only one LED illuminates each associated portion of LCD modulator 20.
  • LCD liquid crystal display
  • the LCD modulator 20 is comprised of both polarizers and polarization- rotating LC material capable of allowing varying amounts of light to pass through the LCD modulator 20 from substantially no light to a significant amount of light according to control voltages applied to the LCD modulator 20.
  • These beamlets of light pass through a two dimensional array of modulator elements 30, with a corresponding set of optical modulation elements 30 situated to coincide with the intensely illuminated regions 24, 26 and 28 within LCD modulator 20 such that light from each beamlet passes through one corresponding modulation element 30 and then exits from the LCD modulator 20 and enters an optical fiber element 34.
  • Each modulator element may be individually controlled to allow a desired amount of light from each beamlet to pass through the LCD modulator.
  • One optical fiber element 34 is situated in front of each LCD modulation element 30 such that it may collect one beamlet of light.
  • the optical fiber elements 34 guide the light from the individual optical fibers and terminate at a flat viewing plane 40.
  • Three fiber elements 34, 34' and 34" carrying light from one blue, one green and one red beamlet, respectively, are grouped together at plane 40 to form one pixel shown at 42.
  • Another pixel shown at 42' is formed from fiber elements 35, 35' and 35".
  • there are other pixels and optical fiber elements e.g.
  • each pixel is formed from three optical fibers that are unique to the particular pixel, such that the three optical fibers are illuminated with red, green and blue light, respectively, obtained from corresponding LCD modulator elements with the three LCD modulation elements being illuminated with light from the red-, green- and blue-emitting LED's, respectively.
  • the viewer at 50 observes the light exiting from the pixels 42, 42' and so on which are formed by the ends of the optical fiber elements 34, 34' and so on located at plane 40, and the viewer sees a pattern of light and dark pixels, depending upon the state of each modulator element 30 of modulator 20. Control of LCD modulator elements 30, forms the desired displayed information in colour.
  • a display module has been constructed comprising seventy-two (72) LEDs (24 red, 24 green, 24 blue) arranged as shown in Figure 2 to illuminate an active matrix LCD modulator that contains no colour filters obtained from Sharp. Although only one modulator element for each fiber is necessary, this LCD has many closely spaced light modulation elements, such that each modulator element 30 in display module 10 actually consists of a group of light modulator elements within the Sharp LCD modulator.
  • Each cluster of three neighbouring LEDs in a triangular configuration includes one LED of each of the three colours. The LEDs have a 15 degree divergence of light.
  • the LCD is placed directly up against the LEDs and therefore light of one colour from a given LED does not mix with light from neighbouring LEDs, but passes through the LCD and enters a first end of twelve (12) optical fibers that are arranged in a group in a circular pattern to efficiently utilize the light given off by the LED. Since each of the twelve (12) optical fibers is arranged in a symmetrical manner relative to the LED, it is illuminated with substantially the same intensity as the other eleven (11 ) fibers which access light from the same pre-selected region of the LCD 20. The arrangement of the optical fibers where light enters them at the first end is shown in Figure 3.
  • each fiber shown in Figure s 4 corresponds to one fiber shown in Figure 3.
  • the two ends of each fiber are held in position by rigid plates about 2 mm in thickness.
  • a first of the plates with holes located as in Figure 3 is at the first end of the optical fibers and a second of the plates with holes located as in Figure 4 is at the second end of the fibers.
  • the fibers are orthogonal to the first and second plates where they pass through the plates, being guided by holes drilled normal to the plane of each plate, and the fibers are suitably bent as they pass between the plates which are about 3 cm apart.
  • the three (3) fibers that end in the three (3) locations of the second plate show ⁇ generally at 1 form a triangular pattern, and originate from the three locations, each shown as numeral 1 in the first plate.
  • the three fibers one is illuminated with green light, one with red and the other with blue.
  • the present tiled optical fiber display which uses LEDs to backlight the LC modulator 20, light from modulator 29 is passed through the optical fibres to form the pixels seen by the viewer.
  • This structure permits the number of pixels to be much larger than the number of LEDs.
  • four (4) full colour pixels are obtained for each LED.
  • optical light-guiding components in this invention may consist of optical fibers 34, 34', 34" as described above, however other optical light guides may also be used, such as those made from moulded or extruded, substantially transparent polymers.
  • the overall light guide may be composed of two or more connected light guide components such as a moulded portion from which light is coupled to a further, extruded component.
  • the present tiled optical fiber display In a conventional LED display, high cost, high current drive electronics are required to turn LEDs on and off. In the present tiled optical fiber display, LED's are not modulated, and only low cost, low power LCD drivers are needed.
  • the present tiled optical fiber displays unlike other LCD's, are not limited in viewing angle by the LED or the LCD. This is due to the optical design of the display, since optional, optical elements such as diffusers may be placed at viewing plane 40 to control the viewing angle. Viewing angles from small (30°) to large (160°) are possible for the present tiled optical fiber displays. Excellent contrast is achieved due to the black display screen. This is due to the use of a light-absorbing optical fiber retaining plate at viewing plane 40 and the high contrast available from the LCD modulator.
  • the present tiled optical fiber display system is also very advantageous in that it enables full colour with outstanding colour saturation, long life
  • the present tiled optical fiber display system is modular. This means that small blocks (for example 30 cm x 30 cm) may be tiled together in a seamless manner to create the required display size. LED displays are also modular, however, projection displays show black lines where they are tiled together.
  • the present tiled optical fiber display system therefore achieves a uniform appearance regardless of the number of modules used, and is therefore suitable for unusual size formats, for example, long, narrow banners (1' x 20') for overhead signage or architect- specified custom installations.
  • Glass-based technologies such as plasma, LCD, EL and CRT are not successful in formats over about 4-8 feet due to their high weight, high cost and fragile nature. These technologies are targeted at TV and smaller, public information displays only.

Landscapes

  • Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Cette invention se rapporte à une structure de dispositif d'affichage à fibres optiques en mosaïque, qui comprend un affichage à cristaux liquides (LCD) rétroéclairé à diode électroluminescente (DEL). La lumière provenant de la diode DEL pénètre dans un réseau de fibres optiques qui dirige cette lumière sur un écran de visualisation. Les fibres optiques éliminent le recours aux filtres couleurs absorbant l'énergie utilisés dans les diodes DEL traditionnelles et permettent également une disposition en mosaïque sans jointure de multiples modules d'affichage.
PCT/CA2005/000050 2004-01-26 2005-01-18 Affichage a fibres optiques en mosaique Ceased WO2005071471A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/587,334 US8723779B2 (en) 2004-01-26 2005-01-18 Tiled optical fiber display
CA2555375A CA2555375C (fr) 2004-01-26 2005-01-18 Affichage a fibres optiques en mosaique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53850104P 2004-01-26 2004-01-26
US60/538,501 2004-01-26

Publications (1)

Publication Number Publication Date
WO2005071471A1 true WO2005071471A1 (fr) 2005-08-04

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PCT/CA2005/000050 Ceased WO2005071471A1 (fr) 2004-01-26 2005-01-18 Affichage a fibres optiques en mosaique

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CA (1) CA2555375C (fr)
WO (1) WO2005071471A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1018662A3 (fr) * 2008-02-25 2011-06-07 Mitsubishi Electric Corp Dispositif d'affichage d'image et unite d'affichage pour dispositif d'affichage d'image.
CN102913866A (zh) * 2012-09-25 2013-02-06 京东方科技集团股份有限公司 一种背光源的背板结构、背光模组和显示装置
CN103994366A (zh) * 2014-05-04 2014-08-20 北京京东方视讯科技有限公司 一种直下式背光模组和显示装置
CN109448564A (zh) * 2019-01-04 2019-03-08 京东方科技集团股份有限公司 一种显示面板及其制作方法、显示装置
CN111243539A (zh) * 2020-02-18 2020-06-05 京东方科技集团股份有限公司 像素单元、显示模组和显示装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5164715A (en) * 1989-05-25 1992-11-17 Stanley Electric Co. Ltd. Color display device
US5661531A (en) * 1996-01-29 1997-08-26 Rainbow Displays Inc. Tiled, flat-panel display having invisible seams
US5808800A (en) * 1994-12-22 1998-09-15 Displaytech, Inc. Optics arrangements including light source arrangements for an active matrix liquid crystal image generator
US6369867B1 (en) * 1998-03-12 2002-04-09 Gl Displays, Inc. Riveted liquid crystal display comprising at least one plastic rivet formed by laser drilling through a pair of plastic plates
WO2002075440A1 (fr) * 2001-03-21 2002-09-26 Screen Technology Limited Affichage a cristaux liquides photoluminescent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5164715A (en) * 1989-05-25 1992-11-17 Stanley Electric Co. Ltd. Color display device
US5808800A (en) * 1994-12-22 1998-09-15 Displaytech, Inc. Optics arrangements including light source arrangements for an active matrix liquid crystal image generator
US5661531A (en) * 1996-01-29 1997-08-26 Rainbow Displays Inc. Tiled, flat-panel display having invisible seams
US6369867B1 (en) * 1998-03-12 2002-04-09 Gl Displays, Inc. Riveted liquid crystal display comprising at least one plastic rivet formed by laser drilling through a pair of plastic plates
WO2002075440A1 (fr) * 2001-03-21 2002-09-26 Screen Technology Limited Affichage a cristaux liquides photoluminescent

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1018662A3 (fr) * 2008-02-25 2011-06-07 Mitsubishi Electric Corp Dispositif d'affichage d'image et unite d'affichage pour dispositif d'affichage d'image.
US8711066B2 (en) 2008-02-25 2014-04-29 Mitsubishi Electric Corporation Image display device and display unit for image display device
US9599323B2 (en) 2008-02-25 2017-03-21 Mitsubishi Electric Corporation Image display device and display unit for image display device
CN102913866A (zh) * 2012-09-25 2013-02-06 京东方科技集团股份有限公司 一种背光源的背板结构、背光模组和显示装置
US9213131B2 (en) 2012-09-25 2015-12-15 Boe Technology Group Co., Ltd. Back-plate structure of backlight, backlight and display device
CN103994366A (zh) * 2014-05-04 2014-08-20 北京京东方视讯科技有限公司 一种直下式背光模组和显示装置
CN109448564A (zh) * 2019-01-04 2019-03-08 京东方科技集团股份有限公司 一种显示面板及其制作方法、显示装置
US11150401B2 (en) 2019-01-04 2021-10-19 Chengdu Boe Optoelectronics Technology Co., Ltd. Display panel, method for fabricating the same, and display device
CN111243539A (zh) * 2020-02-18 2020-06-05 京东方科技集团股份有限公司 像素单元、显示模组和显示装置

Also Published As

Publication number Publication date
CA2555375C (fr) 2011-03-22
CA2555375A1 (fr) 2005-08-04

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