WO1997043686A1 - Systeme d'affichage par projection a cristaux liquides - Google Patents
Systeme d'affichage par projection a cristaux liquides Download PDFInfo
- Publication number
- WO1997043686A1 WO1997043686A1 PCT/JP1997/001571 JP9701571W WO9743686A1 WO 1997043686 A1 WO1997043686 A1 WO 1997043686A1 JP 9701571 W JP9701571 W JP 9701571W WO 9743686 A1 WO9743686 A1 WO 9743686A1
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- Prior art keywords
- liquid crystal
- light
- crystal display
- type liquid
- polarized light
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8793—Arrangements for polarized light emission
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133543—Cholesteric polarisers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
Definitions
- the present invention relates to a projection type liquid crystal display device, that is, a so-called projector, and more particularly to an improvement in a light source suitable for a small projection type liquid crystal display device and an optical system around the light source.
- a light source used in a normal projection type liquid crystal display device a light source using a ' ⁇ ' light tube or a light guide plate, or a discharge type light source such as a metal halide lamp has been used.
- Japanese Patent Application Laid-Open No. 51-119243 discloses a flat light source. This publication describes that the flat light source uses electroluminescence, that is, an electroluminescent element.
- a reflector with a large opening required to irradiate the divergent light from the light source to the liquid crystal panel in parallel is required to reduce the size of the projection type liquid crystal display device. It was a cause of hindrance.
- a liquid crystal display element comprising the above light source and a liquid crystal panel must be provided for each primary color constituting a color image. Miniaturization was even more difficult.
- Japanese Patent Application Laid-Open No. 5-1119243 does not clearly disclose the material constituting the light emitting layer of the electroluminescent device.
- a conventional inorganic electroluminescent material is used as the material of the luminescent waste, the light from the electroluminescent element becomes light with strong divergence. In this case, there is a problem that a bright image cannot be projected because light cannot be effectively incident on the aperture of the projection lens.
- the electroluminescent device using an inorganic material has a problem that the driving voltage is relatively high, such as about 100 volts or more. Disclosure of the invention
- An object of the present invention is to provide a projection-type liquid crystal display device which can be made smaller than before and can project a bright image at a low voltage in order to solve the above-mentioned problems.
- the first problem of the present invention is that the use of an organic electroluminescent device having a resonator structure that can be driven at a lower voltage and emits light with good directivity of emitted light by using an organic electroluminescent device has
- An object of the present invention is to provide a small projection-type liquid crystal display device that prevents a decrease in light quantity and projects a brighter image than before.
- the second object of the present invention is to project a brighter It image by increasing the amount of light that can pass through a polarizing plate of a liquid crystal panel by using a polarization conversion element that converts the polarization state of light emitted from a light source.
- An object of the present invention is to provide a small projection type liquid crystal display device.
- a third object of the present invention is to increase the amount of light that can be transmitted through a polarizing plate of a liquid crystal panel by using a polarization conversion element that functions in a specific wavelength band when projecting a color image, thereby projecting a brighter image than before.
- An object of the present invention is to provide a small projection type liquid crystal display device for displaying images.
- a fourth object of the present invention is to use a small light emitting element having a micro lens array element for condensing light at an opening of a pixel of a liquid crystal panel, thereby reducing the size of the entire device and passing the light through the opening of the pixel.
- a small projection-type liquid crystal display device that increases the amount of light that can be projected and projects a brighter image than before. Is to provide.
- a fifth object of the present invention is to reduce the light amount of only a specific wavelength of light by using a small light emitting element that emits only a specific wavelength of light by resonance of light when projecting a color image.
- An object of the present invention is to provide a small projection-type liquid crystal display device that is brighter than before, improves the purity of projected light, and projects a vivid image.
- the projection type liquid crystal display device wherein the organic electroluminescent element includes an organic thin film layer sandwiched between an electrode layer that reflects light and an electrode layer that transmits light.
- a transmissive liquid crystal panel for controlling transmission of light emitted from the surface of the organic electroluminescent element, and a liquid crystal display element comprising:
- the projection type liquid crystal display device according to claim 1, wherein the organic thin film layer is configured as a white light emitting layer that emits white light.
- the projection-type liquid crystal display device according to claim 3, wherein the organic thin-film layer is configured by sequentially stacking primary color light-emitting layers that emit light in respective wavelength regions of a plurality of primary colors necessary for color display. 2.
- the projection type liquid crystal display device according to item 1.
- the projection type liquid crystal display device wherein the organic electroluminescent element comprises: a transparent electrode layer laminated on a transparent substrate; the organic thin film layer laminated on the transparent electrode layer; and the organic thin film layer 2.
- the projection type liquid crystal display device is constituted by: an electrode layer laminated on the electrode layer, the electrode layer reflecting light emitted from the organic thin film layer.
- the projection-type liquid crystal display device wherein the organic electroluminescent element holds the organic thin film layer between an electrode layer that reflects light emitted from the organic thin film layer and the electrode layer.
- a distance between the half mirror layer and the electrode layer is set to an optical distance at which the light resonates.
- a polarization conversion element that converts a polarization state of light emitted from the organic electroluminescent element
- the transmission-type liquid crystal panel according to any one of claims 1 to 5, wherein the transmission-type liquid crystal panel includes a polarizing plate that transmits light having a specific polarization state among light emitted through the polarization conversion element. Is a projection type liquid crystal display device.
- the polarization conversion element is disposed on the organic electroluminescent element side, and reflects one of a right-handed circularly polarized light and a left-handed circularly polarized light. And a circularly polarized light selective reflection filter that transmits the other circularly polarized light component, and a 1/4 wavelength plate that converts circularly polarized light into linearly polarized light and converts linearly polarized light into circularly polarized light.
- the polarization conversion element is disposed on the organic electroluminescent element side, and reflects one of a right-handed circularly polarized light and a left-handed circularly polarized light.
- a circularly polarized light selective reflection filter that transmits the other circularly polarized light component, and a 1/4 wavelength plate that converts circularly polarized light into linearly polarized light and converts linearly polarized light into circularly polarized light.
- the projection type liquid crystal display device 9 wherein the polarization conversion element is arranged on the transmission type liquid crystal panel side, reflects one linear polarization component of two orthogonal linear polarization components, and , A linearly polarized light selective reflection film that transmits the other linearly polarized light component, and a 1Z4 wave plate that converts circularly polarized light into linearly polarized light and converts linearly polarized light into circularly polarized light. 7.
- a projection type liquid crystal display device 6.
- the polarization conversion element transmits light having a specific polarization state with respect to the emission light having a specific wavelength band, and transmits light having another polarization state.
- the projection type liquid crystal display device 6 further comprising a polarization selective reflection filter that reflects light.
- the projection type liquid crystal display device wherein the organic electroluminescent element and the transmission type liquid crystal panel are A front microlens array element configured by arranging microlens elements for collecting light emitted from the organic electroluminescent element in correspondence with individual pixels of the transmissive liquid crystal panel, further comprising: A projection type liquid crystal display device according to a sixth aspect.
- the projection-type liquid crystal display device wherein a micro-lens element that suppresses divergence of light transmitted through the aperture of each pixel of the liquid crystal panel is provided on an emission side of light transmitted through the transmission type liquid crystal panel.
- the projection-type liquid crystal display device according to any one of claims 10 to 12, further comprising a rear microlens array element arranged and arranged in correspondence with each pixel. It is.
- a polarization conversion element for converting a polarization state of light emitted from the organic electroluminescent element The transmission-type liquid crystal panel according to any one of claims 10 to 14, wherein the transmission-type liquid crystal panel includes a polarizing plate that transmits light having a specific polarization state among the emission lights transmitted through the polarization conversion element.
- the projection type liquid crystal display device described in (1) The projection type liquid crystal display device described in (1).
- the projection type liquid crystal display device wherein the polarization conversion element is disposed on the organic electroluminescent element side, and reflects one of circularly polarized light components of clockwise circularly polarized light and counterclockwise circularly polarized light. , And a circularly polarized light selective reflection filter that transmits the other circularly polarized light component, and a quarter-wave plate that converts circularly polarized light into linearly polarized light and converts linearly polarized light into circularly polarized light. 16.
- a projection type liquid crystal display device according to claim 15, wherein: 18.
- the projection-type liquid crystal display device wherein the polarization conversion element is disposed on the front microlens array element side, and reflects one linear polarization component of two orthogonal linear polarization components. , And a linearly polarized light selective reflection filter that transmits the other linearly polarized light component, and a quarter-wave plate that converts circularly polarized light into linearly polarized light and converts linearly polarized light into circularly polarized light.
- a projection-type liquid crystal display device according to claim 15.
- Item 18 The projection type liquid crystal display device according to item 18, wherein the projection type liquid crystal display device further comprises: a projection lens for projecting an image generated by transmitting through the front transmission type liquid crystal panel onto a screen.
- a projection lens for projecting an image generated by transmitting through the front transmission type liquid crystal panel onto a screen A projection-type liquid crystal display device according to any one of items 4 to 5.
- the projection-type liquid crystal display device according to claim 19, further comprising: a transparent screen configured to allow an image projected from the projection lens to be observed from the opposite side of the projection lens. 19.
- a projection type liquid crystal display device according to item 18.
- the projection type liquid crystal display device comprising: a plurality of the liquid crystal display elements for controlling transmission of light in respective wavelength regions of a plurality of primary colors required for color display;
- a combining optical system that combines images of the primary colors emitted from the plurality of liquid crystal display elements to generate a color image
- the projection-type liquid crystal according to claim 1 further comprising: a projection lens configured to project a color image synthesized by the synthesis optical system onto a screen; and A display device.
- a transmission type liquid crystal panel for controlling transmission of light emitted from the surface of the electroluminescent element, and a liquid crystal display element comprising:
- a combining optical system that combines images of the primary colors emitted from the respective liquid crystal display elements to generate a color image
- a projection lens for projecting a color image synthesized by the synthesis optical system onto a screen 23.
- Item 30. The projection type liquid crystal display device according to any one of Items 20 to 22.
- each of the liquid crystal display elements is disposed between the organic electroluminescent element and the transmission type liquid crystal panel.
- a front microlens array element wherein a microlens element for collecting light emitted from the organic electroluminescent element is arranged so as to correspond to each pixel of the transmission type liquid crystal panel, further comprising: 20.
- a projection type liquid crystal display device according to any one of Items 20 to 23.
- each of the liquid crystal display elements emits divergence of light transmitted through an aperture of each pixel of the liquid crystal panel to an emission side of light transmitted through the transmission type liquid crystal panel.
- the rear micro-lens array is composed by arranging the micro-lens elements to be suppressed in correspondence with the individual pixels. 25.
- 3 ⁇ 4 is a projection type liquid crystal display device.
- each of the liquid crystal display elements is provided between the organic electroluminescent element and the front microlens array element.
- a polarization conversion element that converts a polarization state of light emitted from the organic electroluminescent element
- the transmission liquid product panel according to any one of claims 20 to 26, wherein the transmission liquid product panel includes a polarizing plate that transmits light having a specific polarization state among the emission light transmitted through the polarization conversion element.
- the projection type liquid crystal display device wherein the polarization conversion element of each of the liquid crystal display elements transmits light of a specific polarization state with respect to the emission light of a specific wavelength band, 28.
- the projection liquid product display device further comprising a polarization selective reflection filter that reflects light having a polarization state other than the above.
- FIG. 1 is an overall configuration diagram of a projection type liquid crystal display device according to Embodiment 1 of the present invention.
- FIG. 2 is a configuration diagram of a liquid crystal display element 1a (organic electroluminescent element 10 and transmissive liquid crystal panel 20) of Embodiment 1.
- FIG. 3 is a configuration diagram of a liquid crystal display element 1 b (organic electroluminescent element 11 and transmission type liquid crystal panel 20) of Embodiment 2.
- FIG. 4 is a configuration diagram of a liquid crystal display element 1c (organic electroluminescent element 12 and transmissive liquid crystal panel 20) of Embodiment 3.
- FIG. 5 Liquid crystal display element 1 d of Embodiment 4 (organic electroluminescent element 11.
- FIG. 2 is a configuration diagram of a polarization conversion element 13 and a transmission type liquid crystal panel 20).
- FIG. 6 Liquid crystal display element 1 d of embodiment 4 (organic electroluminescent element 11.
- FIG. 3 is a perspective view of a polarization conversion element 13 and a transmission type liquid crystal panel 20).
- FIG. 7 Liquid crystal display element 1e of Embodiment 5 (organic electroluminescent element 11.
- FIG. 10 is a configuration diagram of a polarization conversion element 14 and a transmission liquid product panel 20).
- FIG. 8 Liquid crystal display element 1 e of embodiment 5 (organic electroluminescent element 11.
- FIG. 3 is a perspective view of a polarization conversion element 14 and a transmission type liquid crystal panel 20).
- liquid crystal display element 1 f of embodiment 6 organic electroluminescent element 12.
- FIG. 3 is a configuration diagram of a front microlens array element 15 and a transmission type liquid crystal panel 16).
- Fig. 10 Liquid crystal display element 1 g of embodiment 7 (organic electroluminescent element 1
- front side micro lens array element 15 transmission type liquid crystal panel
- FIG. 9 is a configuration diagram of a 20-cell 16 and a rear micro-lens array element 17).
- FIG. 2 is a configuration diagram of a polarization conversion element 13, a front micro-lens array element 15 and a transmission type liquid crystal panel 18).
- FIG. 12 is an overall configuration diagram of the projection type liquid crystal display device of Embodiment 9 ( FIG. 13 is an overall configuration diagram of the projection type liquid crystal display device of Embodiment 10).
- FIG. 14 is an overall configuration diagram of the projection type liquid crystal display device of the embodiment 11;
- FIG. 15 is an overall configuration diagram of the projection type liquid crystal display device of the embodiment 12; You. BEST MODE FOR CARRYING OUT THE INVENTION
- the projection type liquid product display device of the present invention includes a liquid crystal display element 1 a , a projection lens 30 and a housing 40.
- the image emitted from the element 1a is configured to be imaged on the screen 50.
- the projection lens may be composed of a combination of a plurality of lenses.
- the projection lens may be configured to magnify an image emitted from the liquid crystal display element 1a and form an image on the screen 50 by, for example, enlarging the image.
- the housing 40 is configured as a storage container for the entire projection type liquid crystal display device, and is configured to appropriately arrange each optical element.
- the material is made of a material that is not affected by deformation of the liquid crystal display element 1a due to heat generation.
- the liquid crystal display element 1a includes an organic electroluminescent element 10 and a transmissive liquid crystal panel 20, and is configured to emit a modulated image.
- the organic electroluminescent element 100 includes a transparent substrate 100, a transparent electrode layer 101, a blue light emitting layer 102, a green light emitting layer 103, a red light emitting layer 104, and a reflective electrode layer 105. Are laminated.
- the transparent substrate 100 is made of a material having a high light transmittance and a high mechanical strength, such as glass.
- the film thickness is adjusted so that it is not too thin and does not lose light transmittance or become too heavy in order to maintain the mechanical strength of the light source.
- the area of this substrate is preferably slightly larger than the area of the liquid crystal panel 20. If the area is too large, power is wasted on unused lighting or The contrast of the projected image is degraded by the reflected light. On the other hand, if the area is too small, sufficient illumination light is not supplied to the periphery of the liquid crystal panel, and the light amount becomes non-uniform.
- the transparent electrode layer 101 is made of a light-transmissive and conductive material such as ITO (indium tin oxide).
- the film thickness is adjusted to a thickness that is not too thin so as to maintain a uniform film thickness in production and that does not lose light transmittance.
- Each of the blue light emitting layer 102, the green light emitting layer 103, and the red light emitting layer 104 is configured as an organic thin film layer containing organic molecules that emit light when an electric field is applied.
- the blue light emitting layer 102 is composed of organic molecules that emit light in a blue wavelength region when an electric field is applied.
- the green light emitting layer 103 is composed of organic molecules that emit light in the green wavelength region.
- the red light emitting layer 104 is composed of organic molecules that emit light in the red wavelength region.
- the blue light-emitting layer 102 that emits blue light includes a triphenyldiamine derivative having a peak emission wavelength of about 380 to 420 nm and a 1,2,4-triazole derivative.
- the laminated structure, the green light-emitting layer 103 emitting green light is tris (8-quinoline) aluminum having a light emission peak wavelength of about 52 nm, and the red light-emitting layer 104 emitting red light.
- each light emitting layer is preferably equal to the area of the transparent electrode layer.
- the reflective electrode layer 105 is configured to include a conductive metal layer that reflects light. Examples of such a metal include a magnesium-silver alloy.
- the film thickness is adjusted so that the film thickness is kept uniform and does not become excessive.
- the surface is preferably the same as that of the transparent electrode layer 101.
- the transmission type liquid crystal panel 20 includes a polarizing plate 201a ⁇ 201b, a transparent substrate 203, and a liquid crystal layer 202. These configurations are the same as those of a known transmission type liquid crystal panel. In the figure,
- a drive circuit provided on a transparent substrate, a transparent electrode, wiring, and a display circuit for supplying a control signal to the drive circuit are not shown.
- the polarizing plates 201a and 201b have the same structure, and are configured to transmit only light having a specific polarization state among incident lights. However, the polarization direction (vibration direction) of the light transmitted through the polarizing plate 201b is shifted by a certain angle from the polarization direction transmitted by the polarizing plate 210a. This angle is set equal to the polarization plane rotation angle for rotating the polarization plane of the light incident on the liquid crystal layer 202 when no voltage is applied.
- the liquid crystal layer 202 uses a well-known twisted nematic liquid crystal or the like, and does not rotate the polarization plane of the incident light when a voltage is applied, and rotates the polarization plane of the incident light when no voltage is applied. Is configured to give.
- the transparent substrate 203 is provided with a transparent electrode (not shown) on the liquid crystal layer side, and a driving circuit is provided for driving the liquid crystal for each pixel.
- a driving circuit is provided for driving the liquid crystal for each pixel.
- the organic electroluminescent device 10 it is preferable to provide the organic electroluminescent device 10 with a cooling mechanism for cooling the organic electroluminescent device.
- an electroluminescent device When an electric field is applied to an electroluminescent device, the device emits light by exhibiting electroluminescence, that is, an electro-luminescence phenomenon.
- electroluminescence When an electric field is applied to a material that produces electroluminescence, it causes an electroluminescence phenomenon, which converts electrical energy into light.
- inorganic materials such as ZnS, SrS, and CaS have been used.
- these inorganic materials have low light intensity: «), and the emitted light is not emitted in parallel and becomes diffused light.
- an organic material is used for the electroluminescent device of the present invention. Due to the fact that light is emitted by recombination of holes injected from the anode and electrons injected from the cathode, the amount of light emitted by electroluminescence increases.
- the light emitting layers 102 to 104 are electroluminescent devices using this organic material.
- Light intensity is related to the applied voltage.
- Each light emitting layer is applied with an electric field according to its film thickness, and emits light according to the intensity of the electric field. If the areas of the transparent electrode layer 101, the coloring layers 102 to 104 and the reflective electrode dust 105 are made substantially equal, the intensity of the electric field in each part of the light emitting layer becomes almost uniform. In other words, a uniform surface over the entire surface of the organic electroluminescent device
- the blue light from the blue light emitting layer 102 passes through the transparent electrode layer 101 as it is and is emitted from the transparent substrate.
- the green light from the green light emitting layer 103 passes through the blue light emitting layer 102 and the transparent electrode film 101 and is emitted from the transparent substrate.
- the red light from the red light emitting layer 104 passes through the green light emitting layer 103, the blue light emitting layer 102, and the transparent electrode film 101, and is transparent.
- each light emitting layer is adjusted so that the light of each primary color emitted from the transparent substrate has the same light amount, each primary color is added evenly, and white light is obtained.
- the reflective electrode layer 105 reflects this light and returns to the liquid crystal panel 20 side.
- the transparent substrate 100 the light directly emitted from each light emitting layer and the return light from the reflective electrode layer 105 are added, and light having a reduced light amount is emitted.
- the organic electroluminescent device used in the present invention is driven at a lower voltage than an inorganic electroluminescent device conventionally used as a flat light source. It is suitable for use as a light source in projection-type liquid product display devices because of its features of high brightness and high brightness.
- the liquid crystal panel 20 of the light from the organic electroluminescent element 10, only light having a specific polarization plane transmits through the polarizing plate 201 a.
- a control signal is supplied to a drive circuit formed on the transparent substrate 203, a voltage is applied between the transparent electrodes of the pixel.
- the liquid crystal molecules in the pixel region are oriented in the direction of the electric field. Therefore, in the pixel to which the voltage is applied, the polarization plane rotation is not given to the incident light, and the pixel reaches the polarizing plate 201b on the opposite side.
- the polarization direction that can be transmitted through the polarizing plate 201b is shifted from that of the polarizing plate 201a, incident light cannot be transmitted through the polarizing plate 201b.
- display / non-display can be set for each pixel by the control signal.
- the liquid crystal display element is formed, for example, to have a diagonal size of about 33 mm (1.3 inches) and can be driven with a drive voltage of about 10 volts.
- a color filter is formed on the pixels of the liquid crystal panel. With this configuration, a color is generated when white light passes through the liquid crystal panel.
- the display device can be downsized.
- a projection-type liquid crystal display device that can obtain a bright image can be provided.
- Embodiment 2 of the present invention is to provide an organic electroluminescent device in which white light can be obtained by a light emitting layer different from that of Embodiment 1.
- the projection type liquid crystal display device of the second embodiment has the same configuration as that of the first embodiment (see FIG. 1).
- the liquid crystal display element 1b is different from the first embodiment in that the liquid crystal display element 1b includes an organic electroluminescent element 11 as shown in FIG.
- the configuration of the liquid crystal panel 20 is the same as that of the first embodiment, and a description thereof will be omitted.
- the organic electroluminescent element 11 is configured by laminating a transparent electrode layer 11 1, a white light emitting layer 112 and a reflective electrode layer 113 on a transparent substrate 110.
- the transparent substrate 110 is the transparent substrate 100 of Embodiment 1
- the transparent electrode layer 111 is the transparent electrode 101 of Embodiment 1
- the reflective electrode layer 113 is the reflective electrode layer 1 of Embodiment 1.
- the description is omitted because it is the same as 05.
- the illustration of the power supply circuit for applying a voltage between the transparent electrode layer and the reflective electrode layer is omitted as in the first embodiment.
- the white light emitting layer 112 is an organic thin film layer, and emits light in a plurality of wavelength regions when an electric field is applied, and emits white light as a whole layer.
- An example of an organic thin film that emits white light when an electric field is applied is a thin film in which a plurality of dyes serving as luminescent centers and a low-molecular electron transport compound are molecularly dispersed in poly (N-vinylcarbazole) vinyl. Can be.
- the structure of such a light emitting film is disclosed in Applied Physics Letters Vol. 67 No. 16, pp. 2281-2283 (1995).
- the white light emitting layer 112 When a voltage is applied between the transparent electrode layer 111 and the reflective electrode layer 113, an electric field is generated according to the voltage value and the thickness of the white light emitting layer.
- the white light emitting layer 112 simultaneously emits light in a plurality of wavelength regions of primary colors according to the intensity of the electric field, and the light in the plurality of wavelength regions is added and emitted from the transparent substrate. Therefore, white light is supplied to the liquid crystal panel 20.
- the light-emitting layer is composed of a thin film that emits white light so that a color image can be projected.
- an organic thin film that emits light of a single color such as green, red, and blue emits light. It may be provided as a layer. In this case, the monochromatic light image is generated. Further, it is preferable to provide the organic electroluminescent element 11 with a cooling mechanism for cooling the organic electroluminescent element.
- the display device can be downsized because a large reflector is not used.
- a projection type liquid crystal display device which can obtain a bright image can be provided.
- Embodiment 3 of the present invention relates to an organic electroluminescent element that has strong directivity in a normal direction of a light emitting surface due to a light resonance structure and emits light of a specific wavelength.
- the projection-type liquid crystal display device of Embodiment 3 has the same configuration as that of Embodiment 1 (see FIG. 1) except for the liquid crystal display element 1c.
- the liquid crystal display element 1c includes an organic electroluminescent element 12 and a transmissive liquid crystal panel 20. Since the liquid crystal panel 20 is the same as that of the first embodiment, the description is omitted.
- the organic electroluminescent device 12 includes a transparent substrate 120, a dielectric mirror layer 121, an interval adjusting layer 122, a transparent electrode layer 123, a hole transport layer 124, and a light emitting layer 122. 5 and a reflective electrode layer 126 are laminated.
- the transparent substrate 120 is the transparent substrate 100 of the first embodiment
- the transparent electrode layer 123 is the transparent electrode layer 101 of the first embodiment
- the reflective electrode layer 126 is the reflective electrode of the first embodiment. Since it is the same as layer 105, its description is omitted. Illustration of a power supply circuit for applying a voltage between the transparent electrode layer and the reflective electrode layer is also omitted as in the first embodiment.
- the dielectric mirror layer 122 has a dielectric multilayer film and is configured to function as a half mirror.
- this multilayer film structure Accordingly, the dielectric mirror layer 121 is configured to transmit a part of the incident light and reflect the rest.
- a dielectric for example, can have use of T i 0 2 laminated structure of (titanium oxide) and S ⁇ 0 2 (oxidized Li co down).
- the film thickness is determined by the number of dielectric multilayer films and the film thickness of each dielectric film corresponding to the resonance wavelength so that about half of the incident light is reflected and the rest is transmitted. Have been.
- An optical resonator is composed of the dielectric multilayer and the reflection electrode.
- Gap adjusting layer 1 2 2 is provided to adjust the distance between the dielectric Mi La more 1 2 1 and the reflective electrode layer 1 2 6, is constituted by a transparent dielectric film such as S i 0 2 I have.
- the hole transport layer 124 is a layer for transporting holes to the light-emitting layer 125 when holes are injected from the transparent electrode film 101 serving as an anode. It is composed of a phenyldiamine derivative.
- the gap between the gap adjusting layers 122 is such that the optical distance between the dielectric mirror layer 121 and the reflective electrode layer 126 is one-half of the peak wavelength of the light emitted from the organic electroluminescent device. It is adjusted to satisfy the condition that it becomes an integral multiple of two wavelengths.
- the organic electroluminescent element is configured by adjusting the material of the light emitting layer 125 and the resonator length of the resonator structure so that the color of the emitted light becomes a desired color.
- the light emitting layer 125 is formed using a material such as tris (8-quinolinol) aluminum.
- an organic electroluminescent device that emits light in a narrow band emission spectrum in a green region having a peak wavelength of 540 nm and a half width of 60 nm can be formed.
- the light emitting layer 125 that emits light in the red region When the light emitting layer 125 that emits light in the red region is formed, a material in which a red fluorescent dye is dispersed in tris (8-quinolyl) aluminum or a complex of europium (Eu) is used.
- the light emitting layer is formed by using the method described above. In this case, the peak wavelength can be set to about 610 nm. Yu A light-emitting layer containing a complex of palladium is disclosed in Japanese Journal of Applied Physics Vol. 34 ppl 883-1887.
- the light emitting layer 125 that emits light in the blue region is formed using a material such as a distyryl biphenyl derivative.
- a material such as a distyryl biphenyl derivative.
- the technique of using a distyryl biphenyl derivative as a light emitting layer is disclosed in Applied Physics, Vol. 62, [No. 10], pp. 1016-1018 (1993).
- a laminated structure of a light emitting layer and a hole transport layer is used, but instead, a laminated structure of a light emitting layer, a hole transport layer, and an electron transport layer may be used.
- the organic electroluminescent element 12 is provided with a cooling mechanism for cooling the organic electroluminescent element.
- a filter that transmits light of a necessary wavelength and absorbs light of an unnecessary wavelength on the light emission side of the organic electroluminescent element 12.
- the organic electroluminescent device of the present invention emits light of a specific wavelength using the resonance effect of light.
- a predetermined voltage for example, about 10 volts
- an electric field is generated between the two electrode layers, and depending on the strength of the electric field, Light is emitted from the light emitting layer 125. Part of this light is transmitted through the dielectric mirror layer 121, but the rest is reflected. The reflected light is reflected again by the reflective electrode layer 126, and reaches the dielectric mirror layer 121. The dielectric mirror layer 121 transmits some light again and reflects the rest, so that the light is transmitted between the reflecting surface of the dielectric mirror layer 121 and the reflective electrode layer 126. Is repeated, so-called light resonance occurs.
- a predetermined voltage for example, about 10 volts
- the wavelength of the resonating light depends on the optical distance between the dielectric mirror layer 121 and the reflective electrode layer 126. If the condition that this optical distance is an integral multiple of 12 wavelengths of the emitted light is satisfied, optical resonance occurs. Therefore, of the wavelengths included in the light emitted from the light emitting layer 125, light that does not satisfy this condition is suppressed, and only light that satisfies the above condition passes through the dielectric mirror layer 121. Is injected. Therefore, the wavelength band of the light emission spectrum is narrower than that of the above embodiment. That is, light is emitted in a specific color.
- the organic electroluminescent element has strong directivity of emitted light in the normal direction (front direction) of the organic electroluminescent element and can emit only light of a specific wavelength. Can be provided without using a large light source such as a reflector, so that the projection type liquid crystal display device can be made smaller than before.
- organic electroluminescent devices are brighter than conventional electroluminescent devices, this device is manufactured for each primary color for color display, and
- Embodiment 4 of the present invention relates to an organic electroluminescent device using a polarization conversion device.
- the projection-type liquid crystal display device of the fourth embodiment has substantially the same configuration as that of the first embodiment (see FIG. 1) except for a liquid crystal display element 1d.
- the liquid crystal display element 1 d includes an organic electroluminescent element 11, a polarization conversion element 13, and a transmissive liquid crystal panel 20.
- the organic electroluminescent device 11 has the same configuration as that of the second embodiment,
- the organic electroluminescent device 10 described in the first embodiment or the organic electroluminescent device 12 described in the third embodiment is directly substituted. Is also good.
- the space distance between the organic electroluminescent element 11, the polarization conversion element 13 and the transmission type liquid crystal panel 20 is drawn largely separated for easy viewing.
- the organic electroluminescent elements are arranged close to each other without leaving a space, or the gap between the elements is filled with a transparent material. And compose it.
- the polarization conversion element 13 includes a quarter-wave film 13 1 and cholesteric liquid crystal dust 13 2.
- the cholesteric liquid crystal layer 132 is made of a cholesteric phase liquid crystal material. When light is incident, the cholesteric liquid crystal layer reflects circularly polarized light having a rotation direction that matches the helical direction of the cholesteric structure, and this helical direction is reflected. It is configured to transmit circularly polarized light that rotates in the opposite direction.
- the circularly polarized light in the rotating direction that can be transmitted by the cholesteric liquid crystal layer 132 is clockwise circularly polarized light L.
- the circularly polarized light in the rotating direction that cannot be transmitted and reflected is referred to as left-handed circularly polarized light.
- the quarter-wave film 13 1 has an optical axis 13 3 parallel to the plane of the drawing and is configured to have optical anisotropy to convert circularly polarized light into linearly polarized light. I have.
- the optical axis 13 3 is arranged so as to be parallel to one side of the rectangular outer shape of the polarization conversion element 13.
- the emitted light from the organic electroluminescent element 11 is natural light having a random light oscillation direction (polarization direction), and includes a clockwise circularly polarized light component L + and a counterclockwise circularly polarized light component L-.
- the cholesteric liquid crystal layer 132 receives circularly polarized light components in both directions.
- the light component L + can pass through this liquid crystal layer 132.
- Quarter wavelength 2 The film 13 1 converts the incoming clockwise circularly polarized light into linearly polarized light 13 4 a that vibrates in a direction that forms an angle of 45 degrees with respect to one side of the outer shape of the polarization conversion element 13 and emits it. I do.
- the left-handed circularly polarized light component L is reflected by this liquid crystal layer and returned to the organic electroluminescent element 11 again.
- the left-handed circularly polarized light component L- returned to the organic electroluminescent element 11 is reflected by the reflective electrode layer 113.
- the left-handed circularly polarized light component L- is reversed in the direction of rotation and becomes a right-handed circularly polarized light component L.
- the clockwise circularly polarized light component L + enters the polarization conversion element 13 again.
- the clockwise circularly polarized light that has passed through the cholesteric liquid crystal layer 132 is directed at an angle of 45 degrees with respect to one side of the rectangular shape of the polarization conversion element 13.
- the light is converted into vibrating linearly polarized light 13 4 b and emitted to the transmissive liquid crystal panel 20. That is, even if the light emitted from the organic electroluminescent device 11 has a random polarization state, it can be finally supplied to the transmission type liquid crystal panel as linearly polarized light having a uniform polarization direction.
- the polarization direction of the linearly polarized light supplied to the transmissive liquid crystal panel 20 and the polarization direction of the polarizers 13 4 a and 13 4 b match the polarization direction of the polarizing plate 201 a that can transmit, a large amount of light can be transmitted. It can be used for light modulation in liquid crystal panels.
- Embodiment 5 of the present invention relates to a modification of the polarization conversion element of Embodiment 4.
- the projection type liquid crystal display device of the fifth embodiment has the same configuration as that of the fourth embodiment except for the liquid crystal display element 1e.
- the liquid crystal display element le includes an organic electroluminescence device 11, a polarization conversion device 14, and a transmission type liquid crystal panel 20, as shown in FIGS. 7 and 8.
- the configuration of the organic electroluminescent element 11 and the transmission type liquid crystal panel 20 is the same as that of the fourth embodiment, and the description is omitted.
- the polarization conversion element 14 includes a microphone aperture polarization beam splitter array 14 1 and a quarter wavelength film 14 2.
- the microphone aperture polarizing beam splitter array 1441 is configured to form a plurality of microprisms 144 by engaging two members having a lightning-shaped M convex shape on the surface with each other. .
- the microprisms 144 are formed such that their boundary lines form a roof with an angle of 45 degrees with respect to the plane of the figure.
- the boundary surface of the microprisms 144 is configured to transmit light in a specific polarization state and reflect light in other polarization states by a dielectric multilayer structure or the like.
- P-polarized light linear polarization
- S-polarized light linear polarization
- the quarter-wave film 1442 has a configuration similar to that of the quarter-wave film 1331 of the fourth embodiment, and has an optical axis 144 parallel to the plane of FIG.
- the organic electroluminescent element 11 of the present embodiment instead of the organic electroluminescent element 11 of the present embodiment, the organic electroluminescent element 10 described in the first embodiment and the organic electroluminescent element 12 described in the third embodiment are directly substituted. Is also good.
- the polarization splitting characteristics of the microphone aperture polarized beam splitter array 141 constituting the polarization conversion element 14 of the present embodiment largely depend on the incident angle of the incident light. For this reason, in order to enhance the directivity of light incident on the micro-polarized beam splitter array 141, it is preferable to use the polarization conversion element 12 of Embodiment 3 having an optical resonance structure.
- the light emitted from the organic electroluminescent element 11 is natural light having a random vibration direction, and includes a clockwise circularly polarized light component L + and a counterclockwise circularly polarized light component L ⁇ .
- the right-handed circularly polarized light component L + of the light emitted from the organic electroluminescent device 11 is converted into p-polarized light by the quarter-wave film 1442, and the micro-polarized beam split array is formed. It is incident on 14. Since the p-polarized light can pass through the microprisms 144, it is given to the transmissive liquid crystal panel 20 as linearly polarized light 144a in the same polarization state.
- the left-handed circularly polarized light component L of the light emitted from the organic electroluminescent device 11 is converted into s-polarized light by the quarter-wave film 144, and the microphone polarized beam split The light enters the array 14.
- the polarized light is reflected by the microprisms 144. Since the boundary surface of the micro prism 144 is inclined 45 degrees with respect to the incident direction of the light, the s-polarized light is turned at right angles to the incident direction at the first reflection, and is incident at the second reflection. Turned in the opposite direction.
- the reflected s-polarized light is again converted to left-handed circularly polarized light L- by the quarter-wave film 142, and returned to the organic electroluminescent element 11 side.
- the returned counterclockwise circularly polarized light L ⁇ is reflected by the reflective electrode layer 113.
- left-handed circularly polarized light L is reflected, it is converted to right-handed circularly polarized light L-.
- This right-handed polarized light L- is converted into p-polarized light by the quarter-wavelength film 142, so that The light is transmitted to the transmissive liquid crystal panel 20 as linearly polarized light 144b that transmits through the rhythm 144 and vibrates in the same direction as the linearly polarized light 144a. That is, even if the light emitted from the organic electroluminescent element 11 has a Rydham polarization state, it can be finally supplied to the transmissive liquid crystal panel side as linearly polarized light having a uniform polarization direction.
- all of the light that has been absorbed because it has not been able to pass through the polarizing plate and has been absorbed by the conventional liquid crystal panel, is at least half the light. Ideally, a twice as bright image as before can be projected on the screen.
- Embodiment 6 of the present invention relates to a liquid product display device using a front microlens array element.
- the projection type liquid crystal display device of the sixth embodiment has the same configuration as that of the first embodiment except for the liquid crystal display element 1f.
- the liquid crystal display element 1 f includes an organic electroluminescent element 12, a front microlens array element 15, and a transmissive liquid crystal panel 16. Since the organic electroluminescent device 12 has the same optical resonance structure as that described in the third embodiment, the description is omitted.
- the front microlens array element 15 includes a plurality of microlens elements 151, which are arranged corresponding to the pixels of the transmissive liquid crystal panel 16. For example, assuming that the pixels of the transmissive liquid crystal panel 16 are composed of 64 (horizontal) x 480 (vertical) pixels, the front-side micro lens array element 15 also has 64 0 x 480 pixels. It is composed of microlens elements 15 1.
- the front microlens array element 15 is a microphone Mouth Lens element 1 51 Using a mold formed in the shape of the lens surface, it is formed by a production method such as plastic injection molding or glass press molding. The form of each microlens element 15 1 may be constituted by a diffractive lens.
- Each microlens element 15 1 is shaped such that its lens surface shape has a fixed focal length (for example, 2.5 mm) with respect to the wavelength of light emitted from the organic electroluminescent element 12. Is done. This focal length is the back focal length of the microlens element 15 1.
- the front microlens array is set so that this focal length is equal to the distance from the principal point of the microlens element 15 1 to the pixel opening 16 3 of the transmissive liquid crystal panel 16. The distance between the element 15 and the transmissive liquid crystal panel 16 is adjusted.
- the antireflection crotch 152 is formed on both the light incident surface and the light exit surface of the microlens element 151. It is preferable that the antireflection film 152 be designed so that its reflectance is the lowest with respect to the wavelength of light emitted from the organic electroluminescent element 12.
- the transmissive liquid crystal panel 16 is configured by sandwiching a liquid crystal layer 162 on a transparent substrate 161. On one surface of the transparent substrate 161 is provided a light-shielding pattern 164 having an opening 163 for each pixel. It should be noted that, for simplification of the drawing, a driving circuit provided on a polarizing plate (corresponding to the polarizing plate 201 a ′ 201 b of the transmissive liquid crystal panel 20 in FIG. 2), a transparent substrate, The transparent electrodes are omitted and the number of pixels is reduced.
- the composition of the transparent substrate ⁇ 61 and the liquid crystal material of the liquid crystal layer 162 are the same as those in Embodiment 1, and therefore the description is omitted.
- the light-shielding pattern 164 is made of a material having a light-absorbing property, such as nylon, which can be formed by patterning by printing or pasting on a substrate. As for the light incident on the transmissive liquid crystal panel 16, only the light irradiated on the opening 16 3 is emitted to the projection lens side, and the light emitted on the light shielding pattern 16 4 is blocked.
- the front microlens array element 15 is an organic electroluminescent element 1 If the light emitted from 2 can be completely condensed only at the opening 163 of the transmissive liquid crystal panel 16, the light shielding pattern 164 is not required.
- This emission light has a narrow wavelength band of the light emission spectrum.
- the microlens element 15 1 is designed to focus the light of this specific wavelength at the aperture 16 3 of the transmissive liquid crystal panel 16.
- the light other than the specific wavelength has different degrees of refraction by the lens, so that the aperture 163 is focused at the front or the rear in the optical axis direction, and the light ring is formed at the aperture 163. growing.
- light of a specific wavelength passes through the opening 163 and exits to the projection lens side, but most of the light of other wavelengths is absorbed by the light-shielding panel 1664. Or it is reflected and not emitted to the projection lens side.
- the parallelism of the light incident on the microlens array element 15 is low, that is, if the divergence is strong, the light cannot be sufficiently stopped down by the microlens element 151, and the condensing spots are It becomes larger than the opening 16 3 and is absorbed or reflected by the light shielding pattern 16 4. Therefore, the amount of light that can pass through the opening 163 decreases, and the image projected on the screen becomes dark.
- an optical resonance structure capable of improving the directivity of the emitted light is provided. It is particularly preferable to use organic electroluminescent elements.
- the microlens array element 15 If the microlens array element 15 is not provided, the light absorbed or reflected by the light-shielding pattern 164 cannot pass through the liquid crystal panel, and the image projected on the screen is dark. Become.
- an organic electroluminescent element having a resonance structure having excellent directivity of emitted light is used as a light source, and a microlens array element is used to condense light to an opening of a pixel of a liquid crystal panel. Since the amount of light that can pass through the opening of the pixel can be reduced, a bright, high-color purity color display can be performed with a projection-type liquid crystal display device for color display.
- Embodiment 7 of the invention relates to a liquid crystal display device further using a rear microlens array element.
- the projection-type liquid crystal display device of the seventh embodiment has the same configuration as that of the sixth embodiment except for a liquid crystal display element 1 g.
- the liquid crystal display element 1 g includes an organic electroluminescent element 12, a front microlens array element 15, a transmission type liquid crystal panel 16, and a rear microlens array element 17. Have been.
- the organic electroluminescent element 12, the front microlens array element 15 and the transmissive liquid crystal panel 16 are the same as those described in the sixth embodiment, and a description thereof will be omitted.
- the rear microlens array element 17 includes a plurality of microphone aperture lens elements 17 1 arranged corresponding to the pixels of the transmissive liquid crystal panel 16. For example, if the pixels of the transmissive liquid crystal panel 16 are composed of 64 (horizontal) x 480 (vertical) pixels, the rear microlens array element 17 also has 640 x 4 pixels. 80 microlens elements] 7 1.
- the rear microlens array element 17 is formed by a method such as plastic injection molding or glass press molding using a mold formed in the lens surface shape of the microphone lens element 171. Ma Further, the form of each microlens element 17 1 may be constituted by a diffractive lens. Each microlens element 17 1 is shaped so that its lens surface shape has a fixed focal length (for example, 2.5 mm) for a specific wavelength of light emitted from the organic electroluminescent element 12. Is done.
- This focal length is the front focal length of the microlens element 17 1.
- the transmission liquid is adjusted so that this focal length is equal to the distance from the pixel aperture 16 3 of the transmission liquid crystal panel 16 to the principal point (princi pa l po int) of the micro lens element 17 1.
- the distance between the product panel 16 and the rear micro-lens array element 17 is adjusted. For example, if the rear focal length of the front microlens array element 15 and the front focal length of the rear microlens array element 17 are set to the same distance, the front microlens array element 15 and the pixel The distance between the opening 163 of the pixel and the distance between the rear microlens array element 17 and the opening 163 of the pixel are set to be equal.
- An anti-reflection film 172 is formed on both the light incident surface and the light exit surface of the rear microlens element 171. It is preferable that the antireflection film 172 be designed so that its reflectance is the lowest with respect to the wavelength of light emitted from the organic electroluminescent element 12.
- the light incident on the transmissive liquid crystal panel 16 is focused at the pixel opening 163 and becomes divergent light 165.
- Each microlens element 1 ⁇ 1 of the rear microlens array element 17 is designed so that its front focal length is equal to the distance from the opening 163. For this reason, the divergent light 16 5 is converted into parallel light again by the micro lens array element 17.
- the rear microlens array element suppresses the divergence of light transmitted through the liquid crystal panel 16
- the projection type liquid crystal display capable of projecting a brighter image.
- Equipment can be provided.
- Embodiment 8 of the present invention relates to a polarization conversion element and a micro lens array element.
- the present invention relates to a liquid crystal display device that uses both of them.
- the projection type liquid crystal display device of the eighth embodiment has the same configuration as that of the first embodiment except for the liquid crystal display element 1h.
- the liquid crystal display element 1 h includes an organic electroluminescent element 12, a polarization conversion element 13, a front microlens array element 15, and a transmission type liquid crystal panel 18.
- the organic electroluminescent device 12 has the same optical resonance structure as that described in the third embodiment.
- the polarization conversion device 13 is the same as that described in the fourth embodiment.
- the device 15 has the same configuration as that described in the sixth embodiment, and a description thereof will be omitted.
- the transmission type liquid crystal panel 18 includes two transparent substrates 18 1, a liquid crystal layer 18 2, and light plates 18 a and 18 b.
- An opening 183 is provided for each pixel on one liquid crystal layer side of the transparent substrate 181, and a light-shielding pattern 184 is provided around the opening 183.
- the drive circuit provided on the transparent substrate, the transparent electrodes, wiring, and a display circuit for supplying a control signal to the drive circuit are the same as those in the first embodiment in that they are not shown.
- the liquid crystal layer 182 is made of a known twisted nematic liquid crystal or the like, and does not rotate the polarization plane of the incident light when a voltage is applied, but rotates the polarization plane of the incident light when no voltage is applied. Is configured.
- the polarizing plates 185a and 185b have the same structure, and are configured to transmit only light having a specific polarization state among incident lights. However, the polarization direction of the light transmitted by the polarizing plate 185b is shifted by a certain angle from the polarization direction of the transmitted light by the polarizing plate 185a. This angle causes the liquid crystal layer 18 2 to rotate the plane of polarization of the light incident when no voltage is applied. Is set to be equal to the rotation angle of the polarization plane.
- the polarization direction of the linearly polarized light emitted from the polarization conversion element 13 and the polarization direction of the polarizer 185a that can be transmitted therethrough are arranged so as to coincide with each other. Further, the distance between the principal point of the micro lens element 15 1 of the front micro lens array element 15 and the opening 18 3 of the transmissive liquid crystal panel 18 is defined as Set equal.
- the circularly polarized light in the rotation direction that can be transmitted by the cholesteric liquid crystal layer 13 2 is clockwise circularly polarized light L +, and the circularly polarized light in the rotational direction that cannot be transmitted and reflected is counterclockwise circularly polarized light. .
- the wave region of light emitted from the organic electroluminescent element 12 is limited by the optical resonance structure (see Embodiment 3).
- the vibration direction of the light is random, and includes a clockwise circularly polarized light component L + and a left-handed circularly polarized light component L.
- the cholesteric liquid crystal layer 132 receives circularly polarized light components in both directions.
- the right-handed circularly polarized light component L + among the circularly polarized light components incident on the cholesteric liquid crystal layer 13 2 can be transmitted through the liquid crystal layer 13 2, and is incident on the quarter-wave film 13 1 side. I do.
- the quarter-wave film 13 1 converts the incident clockwise circularly polarized light into linearly polarized light 13 4 a that vibrates in a direction at an angle of 45 degrees to one side of the rectangular outer shape of the polarization conversion element 13. Change and inject.
- the left-handed circularly polarized light component L- is reflected by this liquid crystal layer and returned to the organic electroluminescent element 12 again.
- the left-handed circularly polarized light component L returned to the organic electroluminescent element 12 reaches the reflective electrode layer 126 and is reflected there.
- the direction of rotation of the left-handed circularly polarized light component L- is reversed and becomes a right-handed circularly polarized light component L +.
- the clockwise circularly polarized light component L + enters the polarization conversion element 13 again.
- the circularly polarized light component is rotated clockwise to become a clockwise circularly polarized light component L +, so that it passes through the cholesteric liquid crystal layer 132 and enters the quarter-wave film 13 1 side. Injected.
- the quarter-wave film 13 1 makes the right-handed circularly polarized light transmitted through the cholesteric liquid crystal layer 13 2 at an angle of 45 degrees to one side of the rectangular outer shape of the polarization conversion element, and The light is converted into linearly polarized light 134b that oscillates in the same direction as that of the polarized light 134a, and is emitted to the transmissive liquid crystal panel 18 side.
- the transmissive liquid crystal panel 18 is supplied with near-parallel light having the same vibration direction.
- the organic electric field element having the resonator structure since the organic electric field element having the resonator structure is used as the light source, the wavelength band of the emission spectrum of the emitted light is narrowly limited. Therefore, the polarization selective reflection function of the polarization conversion element and the optical characteristics of the microlens array element may be optimized only for the specific wavelength band.
- the wavelength dependence of the polarization selective reflection function of the polarization conversion element is determined by the helical period of the cholesteric liquid crystal layer 132 in the polarization conversion element according to the fourth embodiment, and the dielectric multilayer film in the polarization conversion element according to the fifth embodiment. Is determined by the stacking cycle of
- the polarization selective reflection function is to be provided in the wavelength region including red, green, and blue, it is necessary to superimpose a spiral periodic structure or a multilayer periodic structure corresponding to each primary color in any of the polarization conversion elements. .
- a polarization conversion element that functions only in each specific wavelength region such as red, green, and blue, it is sufficient to provide a spiral periodic structure or a laminated periodic structure that corresponds only to that wavelength region. The structure of the polarization conversion element is simplified.
- the micro lens element 15 1 constituting the front side micro lens array element 15 condenses the light from the polarization conversion element 13 to the opening 18 3 of the transmissive liquid crystal panel 18.
- the light passes through the 32 polarizer 185a and is condensed on the aperture 183 of the pixel.
- the liquid crystal layer 182 rotates the plane of polarization of the incident light by a certain angle.
- the liquid crystal molecules are oriented in the direction of the electric field, and do not give a polarization plane rotation to incident light.
- the incident light is rotated in the polarization plane, passes through the polarizing plate 185b, and is emitted to the projection lens side.
- incident light is not given a polarization plane rotation, cannot pass through the polarizing plate 185b, and is absorbed or reflected.
- the organic electroluminescent device can extract strong light of a specific wavelength excellent in directivity, align the polarization direction by the polarization conversion device, and open the pixel by the microlens array device. Since it is possible to increase the amount of light that can pass through the projector, it is possible to provide a projection type liquid crystal display device capable of projecting a bright projection image.
- Embodiment 9 of the invention relates to a projection type liquid crystal display device in which an image projected on a screen is observed from the back side.
- the projection type liquid crystal display device of the present invention includes a liquid crystal display element 1, a projection lens 31, a housing 41, and a screen 51.
- the liquid crystal display elements la, lb, lc, ld, le, lf, lg, and lh of the first to eighth embodiments are applied.
- the organic electroluminescent device 10 and the transmissive liquid crystal panel 20 of FIG. 1 are merely examples, and the optical elements of the above embodiments can be applied instead.
- the projection lens 31 is configured to form an image emitted from the liquid crystal display element 1 on the screen 51.
- Only one projection lens W is shown in the figure, it consists of a combination of multiple lenses. Of course, you may do it. Specifically, it is configured such that an image projected from the liquid crystal display element 1 is magnified or the like to form an image on the screen 51.
- the liquid crystal display element 1 f of the sixth embodiment or the liquid crystal display r> element 1 h of the eighth embodiment is used, the emitted light becomes divergent light. For this reason, the projection lens 31 is adjusted so that this divergent light is imaged on the screen 51.
- the projection lens 31 is configured to invert and display the projected image.
- the housing 41 is configured so that the liquid crystal display element 1, the projection lens 31 and the screen 51 can be arranged at an appropriate distance.
- the screen 51 is composed of a translucent film or a resin plate having a Fresnel lens so that the image projected on the screen can be observed from the back of the screen 5.
- the image emitted from the liquid crystal display element 1 forms an image on the screen 51.
- the observer observes the image displayed on the screen 51 from behind. For example, if the diagonal size of the liquid crystal display element 1 is 33 mm (1.3 inches) and the magnification of the projection lens 31 is about 12 times, the image displayed on the screen 51 Has a diagonal size of 40 O mm (15.6 inches).
- Embodiment 10 of the present invention is to provide a projection type liquid crystal display device for color display.
- the projection type liquid crystal display device of the present embodiment includes a red liquid crystal display element 1R, a green liquid crystal display element 1G, a blue liquid crystal display element 1B, and a red wavelength display element. Includes film 70R, green wave film 70G, blue wavelength film 70B, dichroic prism 60, projection lens 32, housing 42 and screen 51. It is configured.
- the suffix R is attached to the optical element for red, the suffix G to the optical element for green, and the suffix B to the optical element for blue.
- the liquid product display elements 1R, 1G and 1B are each provided with an organic electroluminescent element emitting green light, an organic electroluminescent element emitting green light, or an organic electroluminescent element emitting blue light. Apply the liquid crystal display element.
- the liquid crystal display element includes an organic electroluminescent element 7- having an optical resonance structure (reference numerals 12 in FIGS. 4, 9 to 11), and 1c, 1f, 1g, and 1h.
- a liquid crystal display element whose emission color wavelength is adjusted is used. That is, in the liquid crystal display element 1R, the wavelength region of the light emitted from the organic electroluminescent device 12 is set to red. In the liquid crystal display element 1G, the wavelength region of the light emitted from the organic electroluminescent element 12 is set to green. In the liquid crystal display element 1B, the wavelength region of the light emitted from the organic electroluminescent element 12 is set to blue.
- the material of the light emitting layer 125 of the organic electroluminescent element 12 is selected, and the distance between the dielectric mirror layer 121 and the reflective electrode layer 126 is adjusted.
- a polarization conversion element having a polarization selective reflection function over the entire visible light region may be used.
- Light use efficiency can be improved.
- the lens is designed so that aberration is reduced when light of the color is incident. Further, the antireflection film (152, 5172) of the microlens element is adjusted so that the reflectance becomes lowest when light of the color enters. For example, for a liquid crystal display element 1R, light of wavelength 610 nm, for a liquid crystal display element 1G, light of wavelength 535 nm, and for a liquid crystal display element 1B, wavelength of 47 Adjust to satisfy the above conditions for 0 nm light.
- Each wavelength film 70 is composed of a glass plate or a plastic plate.
- the red wavelength film 70R is configured to transmit red wavelength light.
- the green wavelength film 70 G is configured to transmit green wavelength light.
- the blue wavelength film 70B is configured to transmit light having a blue wavelength.
- J50G and 70B may be excluded from the components.
- the dichroic prism 60 is configured to be able to combine images from the liquid crystal display elements 1R, 1G, and 1B. That is, the dichroic prism 60 is formed by assembling a plurality of prisms and forming a dielectric multilayer film that reflects light of a specific wavelength on the boundary surface. example
- the film 60R is configured to reflect light of a red wavelength and transmit light of other wavelengths.
- the film 60B is configured to reflect light of a blue wavelength and transmit light of another wavelength.
- the projection lens 32 is adjusted so that the composite image from the dichroic prism 60 can be projected on the screen 51.
- the housing 42 is configured with a capacity that can include the entire optical element of the present embodiment.
- the screen 51 is the same as that described in the ninth embodiment.
- the images supplied to the dichroic prism 60 through 70 G and 70 B are light images of the respective primary colors.
- the red light is reflected by the film 60R of the dichroic prism 60.
- the blue light is reflected by the film 60B of the dichroic prism 60.
- Light of green r and color passes through both layers without being reflected by any of the films 60R and 60B.
- an image in which these three colors of light are combined is emitted to the projection lens 32 side of the dichroic prism 60.
- This image is enlarged and projected on the screen 51 by the projection lens 32.
- the image projected on the screen 51 can be viewed from behind by 10 observers.
- the transmissive liquid crystal panel is constructed with a diagonal size of about 63.5 mm (2.5 inches)
- the rear projection screen 51 will have a diagonal size of about 1 m (about 4 m). (0 inch).
- the 15 liquid crystal display elements of the present invention are provided for each primary color, and the liquid crystal display elements are synthesized to generate a color image. A brighter color image can be displayed as compared with the case of illuminating with a light emitting element.
- Embodiment 11 of the present invention is different from Embodiment 10 for color display.
- the present invention provides 20 projection-type liquid crystal display devices.
- the projection type liquid crystal display device of the present embodiment has substantially the same configuration as the projection type liquid crystal display device of the tenth embodiment.
- the projection type liquid crystal display device of the present embodiment further includes a reflection mirror 180.
- the present embodiment is different from the tenth embodiment in that a screen 52 is provided instead of the screen 51 of the tenth embodiment and is stored in a housing 43.
- the reflection mirror 80 is configured to be able to reflect light from the projection lens 32 in a direction perpendicular to its optical axis.
- the screen 52 is configured so that the image reflected by the reflection mirror 80 can be observed from the back of the screen at 30:30, and can be projected.
- the housing 43 is configured so that each optical element can be arranged so that an image can be formed on the screen 52 with an appropriate size.
- the process is the same as that of the tenth embodiment until the combined image in which the images of the respective primary colors are combined is emitted from the projection lens 32.
- This composite image is reflected by a reflection mirror 180 and projected on a screen 52.
- the distance on the optical axis from the projection lens 32 to the screen 52 must be the distance from the projection lens 32 to the screen 51 in Embodiment 10. Should be equal to
- the liquid crystal display element of the present invention is provided for each primary color, and the liquid crystal display elements are combined to generate a color image, a bright color image can be displayed.
- the image is further enlarged by the reflection, so that there is an advantage that a large image magnification can be obtained even at a short distance on the optical axis.
- the image can be inverted by reflection from the reflection mirror, when the image emitted from the projection lens is inverted, the image can be further inverted to correct the image.
- Embodiment 12 of the present invention provides a configuration of a projection type liquid crystal display device for color display different from that of Embodiment 10.
- the projection type liquid crystal display device of the present embodiment has substantially the same configuration as that of the projection type liquid crystal display device of the tenth embodiment.
- the projection type liquid crystal display device of the present embodiment is different from the embodiment 10 in that the screen is not built in the housing as in the embodiment 10 but can be projected on an external screen 50. Different from 1 0.
- the projection lens 34 is configured to project a composite image on an external screen 50.
- a single projection lens is used, but a plurality of lenses may be used in combination.
- projection on external screens Therefore, the distance from the screen is not fixed. For this reason, it is configured so that the focus can be adjusted no matter how far the screen 50 is installed.
- the housing 44 does not include a screen, the housing 44 is configured to include a liquid crystal display element 1, a wavelength film 70, a dichroic prism 60, and a projection lens 34.
- the light emitted from the projection lens 34 is projected on a screen provided outside.
- the magnification of the image changes according to the lens configuration of the projection lens 34 and the distance between the projection lens 34 and the screen 50.
- a projection-type liquid crystal display device that does not include a screen can be provided.
- a flat transmissive liquid crystal panel is used. Therefore, the organic electroluminescent element for uniformly irradiating light to the liquid crystal panel is also formed in a flat plate shape. However, the display surface of the liquid crystal panel is curved. If so, the organic field emission device may be deformed according to the surface shape of the liquid crystal panel.
- the front microlens array element, the rear microlens array element, the polarization conversion element, and the structure of the transmissive liquid crystal panel can adopt other structures as long as they have the functions described in the embodiment.
- a liquid crystal display device can be provided.
- an organic electroluminescent element having a resonator structure that emits light with good directivity of radiated light is used in a liquid crystal panel, a decrease in the amount of light due to divergence of light is reduced. Prevention, low-voltage driving is possible, A small projection liquid product display device capable of projecting a bright image can be provided.
- a projection type liquid crystal display device that projects a bright image by reducing the amount of light that can be transmitted through the polarizing plate of the liquid crystal panel. Can be provided.
- a polarization conversion element that functions in a specific wavelength band is used, so that the amount of light that can pass through a polarizing plate of a liquid crystal panel is increased, and a small projection that projects a bright image is used.
- Type liquid crystal display device when projecting a color image, a polarization conversion element that functions in a specific wavelength band is used, so that the amount of light that can pass through a polarizing plate of a liquid crystal panel is increased, and a small projection that projects a bright image is used.
- the microphone aperture lens array element for condensing light at the aperture of the pixel of the liquid crystal panel is used, the amount of light that can pass through the aperture of the pixel is increased, and a small projection type liquid crystal display device that projects a bright image is provided. Can be provided.
- a small light-emitting element that emits only light of a specific wavelength by light resonance is used, so that the amount of light of only a specific wavelength is increased, and a bright image is projected.
- a small projection-type liquid crystal display device can be provided.
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97918399A EP0838715B1 (en) | 1996-05-10 | 1997-05-09 | Projection liquid crystal display |
US08/983,446 US6507379B1 (en) | 1996-05-10 | 1997-05-09 | Liquid crystal projection device having a liquid crystal display element that includes an electroluminescent element |
DE69731163T DE69731163T2 (de) | 1996-05-10 | 1997-05-09 | Flüssigkristall-projektionsanzeigevorrichtung |
JP09540724A JP3074735B2 (ja) | 1996-05-10 | 1997-05-09 | 投与型液晶表示装置 |
AT97918399T ATE279741T1 (de) | 1996-05-10 | 1997-05-09 | Flüssigkristall-projektionsanzeigevorrichtung |
US10/226,298 US6900858B2 (en) | 1996-05-10 | 2002-08-23 | Liquid crystal projection device having a liquid crystal display element that includes an electroluminescent element |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11656996 | 1996-05-10 | ||
JP8/116569 | 1996-05-10 | ||
JP19680296 | 1996-07-25 | ||
JP8/196802 | 1996-07-25 |
Related Child Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/983,446 A-371-Of-International US6507379B1 (en) | 1996-05-10 | 1997-05-09 | Liquid crystal projection device having a liquid crystal display element that includes an electroluminescent element |
US08983446 A-371-Of-International | 1997-05-09 | ||
US10/013,653 Division US6671014B2 (en) | 1996-05-10 | 2001-12-13 | Liquid projection device having a liquid crystal display element that includes an electroluminescent element |
US10/226,298 Continuation US6900858B2 (en) | 1996-05-10 | 2002-08-23 | Liquid crystal projection device having a liquid crystal display element that includes an electroluminescent element |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997043686A1 true WO1997043686A1 (fr) | 1997-11-20 |
Family
ID=26454876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/001571 WO1997043686A1 (fr) | 1996-05-10 | 1997-05-09 | Systeme d'affichage par projection a cristaux liquides |
Country Status (8)
Country | Link |
---|---|
US (3) | US6507379B1 (ja) |
EP (1) | EP0838715B1 (ja) |
JP (1) | JP3074735B2 (ja) |
KR (1) | KR100503862B1 (ja) |
AT (1) | ATE279741T1 (ja) |
DE (1) | DE69731163T2 (ja) |
TW (1) | TW359765B (ja) |
WO (1) | WO1997043686A1 (ja) |
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JPS6329737A (ja) * | 1986-07-23 | 1988-02-08 | Nippon Telegr & Teleph Corp <Ntt> | 光波長選択素子 |
JPH02176628A (ja) * | 1988-09-08 | 1990-07-09 | Casio Comput Co Ltd | 液晶表示装置 |
JPH03223811A (ja) * | 1990-01-30 | 1991-10-02 | Sony Corp | 光源用偏光変換素子 |
JPH03241311A (ja) * | 1990-02-20 | 1991-10-28 | Seiko Epson Corp | 偏光光源装置 |
JPH04129191A (ja) * | 1990-09-20 | 1992-04-30 | Hodogaya Chem Co Ltd | 有機エレクトロルミネッセンス素子の製造法 |
JPH04144094A (ja) * | 1990-10-05 | 1992-05-18 | Hitachi Ltd | バックライト用el |
JPH04229825A (ja) * | 1990-12-27 | 1992-08-19 | Canon Inc | 散乱型液晶表示デバイスを用いた画像表示装置 |
JPH05281508A (ja) * | 1992-04-03 | 1993-10-29 | Hitachi Ltd | 液晶投写型ディスプレイ装置 |
JPH06160842A (ja) * | 1992-11-17 | 1994-06-07 | Ricoh Co Ltd | 液晶表示装置用バックライトシステム |
JPH0736032A (ja) * | 1993-07-23 | 1995-02-07 | Fuji Xerox Co Ltd | バックライト光源 |
JPH0772809A (ja) * | 1993-09-02 | 1995-03-17 | Toray Ind Inc | 液晶ディスプレイ用マイクロレンズアレイシート、およびそれを用いた液晶ディスプレイ |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6882379B1 (en) | 1998-06-05 | 2005-04-19 | Seiko Epson Corporation | Light source device including a planar light source having a single, substantially continuous light emission area and display device incorporating the light source device |
US7126652B2 (en) | 1998-06-05 | 2006-10-24 | Seiko Epson Corporation | Light source device including a planar light source having a single, substantially continuous light emission area and display device incorporating the light source device |
JP2000098931A (ja) * | 1998-07-24 | 2000-04-07 | Seiko Epson Corp | 表示装置 |
WO2000015009A1 (fr) * | 1998-09-02 | 2000-03-16 | Seiko Epson Corporation | Source lumineuse et dispositif d'affichage |
EP1039784A4 (en) * | 1998-09-02 | 2004-12-15 | Seiko Epson Corp | LIGHT SOURCE AND DISPLAY DEVICE |
KR100533451B1 (ko) * | 1998-09-02 | 2005-12-06 | 세이코 엡슨 가부시키가이샤 | 광원 및 표시 장치 |
CN100340136C (zh) * | 1998-09-02 | 2007-09-26 | 精工爱普生株式会社 | 显示装置 |
JP2005274933A (ja) * | 2004-03-24 | 2005-10-06 | Seiko Epson Corp | 光源装置及びプロジェクタ |
US7293876B2 (en) | 2004-03-24 | 2007-11-13 | Seiko Epson Corporation | Light source unit and projector |
Also Published As
Publication number | Publication date |
---|---|
ATE279741T1 (de) | 2004-10-15 |
KR100503862B1 (ko) | 2005-11-14 |
KR19990028896A (ko) | 1999-04-15 |
US6671014B2 (en) | 2003-12-30 |
TW359765B (en) | 1999-06-01 |
US6507379B1 (en) | 2003-01-14 |
JP3074735B2 (ja) | 2000-08-07 |
EP0838715A4 (en) | 2000-03-29 |
EP0838715A1 (en) | 1998-04-29 |
EP0838715B1 (en) | 2004-10-13 |
US6900858B2 (en) | 2005-05-31 |
US20030001984A1 (en) | 2003-01-02 |
DE69731163T2 (de) | 2006-02-16 |
US20020041348A1 (en) | 2002-04-11 |
DE69731163D1 (de) | 2004-11-18 |
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