CN1756988A - A display device and an illumination system therefor - Google Patents
A display device and an illumination system therefor Download PDFInfo
- Publication number
- CN1756988A CN1756988A CNA2004800058736A CN200480005873A CN1756988A CN 1756988 A CN1756988 A CN 1756988A CN A2004800058736 A CNA2004800058736 A CN A2004800058736A CN 200480005873 A CN200480005873 A CN 200480005873A CN 1756988 A CN1756988 A CN 1756988A
- Authority
- CN
- China
- Prior art keywords
- display device
- light
- illuminator
- display panel
- liquid crystal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
-
- 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
-
- 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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
-
- 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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/02—Composition of display devices
- G09G2300/023—Display panel composed of stacked panels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0205—Simultaneous scanning of several lines in flat panels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3622—Control of matrices with row and column drivers using a passive matrix
- G09G3/3625—Control of matrices with row and column drivers using a passive matrix using active addressing
Abstract
This invention relates to a display device (1), comprising a display panel (2) having a layer of electro-optical material (4), a first light-transmissive substrate (5) provided with electrodes (7) in an area of pixels arranged in rows and columns, a second lighttransmissive substrate (6), said layer of electro-optical material (4) being sandwiched between said first and second layer (5, 6), and an illumination system (3), being arranged on a side of the second substrate (6) being remote from said layer of electro-optical material (4), the illumination system comprising an optical waveguide (14) of an optically transparent material, having an exit face (15) facing said display panel (2). According to the invention, the illumination system (3) further comprises a matrix-addressable light-management member (27).
Description
The present invention relates to a kind of display device that comprises light valve display panel and illuminator.The invention particularly relates to a kind of like this display device, this display device includes the illuminator of the optical waveguide that comprises light transparent materials, and described optical waveguide has an exit facet towards described display panel.
Now, generally used the display that adopts light valve or shutter technology.The representative instance of this display is exactly a LCD.The basic function of light valve or shutter displays is that display or its voxel model can printing opacity (white pixel) or resistance light (black picture element), but display itself does not produce light.Therefore, need illumination backlight.This even back illuminates the whole surface of LCD, and illuminate display so that the light that backlight emission goes out (for example passes after the low transmission liquid crystal display with light, owing to arranged the polarizer and color filter in the display, therefore LCD can only the very little number percent of transmission, typically between 5%-10%), owing to there being sufficient light to make white pixel perceived.The example of this display device is disclosed among the patent document WO 02/21042.
But, mean that above the brightness by the white pixel of the LCD of backlighted does not rely on picture material, this with the prior art cathode-ray tube (CRT) in image content to influence the brightness of white pixel opposite.Therefore this is due to the fact that: in cathode-ray tube (CRT), the average beam electric current is restricted, if when white pixel is only arranged seldom, it is brighter that white pixel just becomes.This phenomenon can cause and is shown image " flicker " phenomenon.
In addition, there are some basic differences between the different display application.When display when the monitor (for example, during as computer monitor), common many pixels are in brighter state, therefore the performance of LCD is superior in this application, even just most of pixels are in " white " state or open mode (on-state), image still continues to be in bright state.But for TV applications, performance is just different.In typical television image, only there is the sub-fraction pixel very bright usually.In this case, cathode-ray tube (CRT) can obtain one can not with the brightness of LCD coupling.In backlight liquid crystal display, at first must produce a large amount of light, because the screen major part is a black, therefore the most of light that produces will be absorbed once more.This has caused power dissipation, has also limited the preceding performance of screen, and performance is considered to the sixty-four dollar question that LCD TV is used at present before this screen.
In addition, by being called as the monitor features of " showing bright " (LightFrame, a trade mark of Philip monitor), the special characteristics of cathode-ray tube (CRT) is further developed.By making the most of regional duskiness of screen, fraction (for example part of display photos or film) can be enhanced.Be expected to obtain similar functions for LCD.
Therefore, a target of the present invention is that to realize being used for the peak brightness of LCD improved backlight.Another target of the present invention is to realize the improved LCD of black level, and another target of the present invention is the LCD that realizes that contrast is improved.In addition, a target of the present invention is to improve the preceding performance of screen of the LCD of contrast and colour gamut aspect, and improves efficient backlight.
According to defined invention in the claim 1, can partly realize above-mentioned at least and other target.Therefore, the present invention has instructed a kind of like this display device, this display device comprises: display panel and illuminator, described display panel comprises electro-optical material layer, first light transmissive substrate of the electrode of arranging with row and column is equipped with at pixel region, second light transmissive substrate, described electro-optical material layer is clipped between described first and second layers, described illuminator is disposed on second substrate side away from described electro-optical material layer, this illuminator comprises the optical waveguide of light transparent materials, described optical waveguide has the exit facet towards described display panel, it is characterized in that described illuminator also comprises matrix-addressable light-management member, all like matrix-addressable output coupling units.Like this, the light of light source generation just can be distributed on the display panel in more effective mode.Therefore, the contrast of display can be improved, and the part that can realize lighting device strengthens and weaken the part.Compatibly, described matrix-addressable light-management member comprises liquid crystal material layer, row electrode layer and row electrode layer, and described liquid crystal material layer is clipped between described row electrode layer and the described row electrode layer, and preferred described liquid crystal material layer is made of liquid crystal gel material.Term " liquid crystal gel material " should be understood to a kind of like this material in this article, this material is to apply after voltage makes that monomer-polymer changes high scattering state into from pellucidity, the material that the photopolymerization by liquid crystal and polyfunctional group liquid crystal monomer under the situation that light trigger exists forms.Preferred described illuminator also comprises a light source, described light source is disposed in one side at least of described matrix-addressable output coupling unit, the observer of display device sees as described, be arranged in the dorsal part of described matrix-addressable output coupling unit, or the observer of display device sees as described, is arranged in the front side of described matrix-addressable output coupling unit.
In addition, compatibly, display device comprises a driver element, this driver element makes the image that its analysis will show on described display panel bright and dark-part is set, determine the light illumination mode that will be shown by described display device in view of the above, and produce the drive signal that is fit to simultaneously and give the saltus step of not expecting in illumination that described display panel produces because of light illumination mode with compensation or the color.Compatibly, described driver element is set makes its addressing strobe pulse offer the continuous substantially addressing band of illuminator electrode, make that by this select time ratio of described strobe pulse is long divided by the frame time of addressing band quantity, thereby make the strobe pulse of sequential addressing band overlapping.Therefore, can improve the brightness of illuminator.Can alternatively or can be used as and replenish ground, described driver element is set make it that the two or more addressing bands of addressing strobe pulse to the illuminator electrode are provided simultaneously.This point can be by using different harmonic waves or using more orthogonal signal to realize to different band (for example going).Therefore, can select multi-ribbon so that they stay open state in the sufficiently long time, and need not criticize the ability that all needs to be provided with separately intensity level for each pixel.
Compatibly, display device also comprises a bias level modulator, and this bias level modulator is configured to control the bias level of illuminator.Therefore, according to the video content that is shown image, the part that can obtain throwing light on strengthens.
In addition, described display device can suitably comprise the light source power modulator that is used to modulate the illuminator light source power, and this modulation depends on the light illumination mode that is shown by described lighting device.Therefore, can further improve the display contrast, improve brightness, and obtain better colouristic properties.Compatibly, described modulated light source comprises a kind of in cold-cathode fluorescence lamp, hot-cathode fluorescent lamp, white luminous diode or the combination of colorful light-emitting diode.
By the method for above-mentioned driving display device, can realize above-mentioned and other target to small part, said method comprising the steps of: analysis will be shown the bright and dark-part of the image of panel demonstration; To become to be suitable for the resolution of described lighting device about the information translation of the bright and dark-part of analyzed image; To send lighting device to about the information of analyzed image; To convert the resolution that is fit to described display panel about the activation bit of described lighting device to, color that causes by light illumination mode with compensation or brightness do not expect saltus step and by the described lighting device of the described information-driven that has been converted.
Hereinafter, by the preferred embodiment of the present invention, in conjunction with the accompanying drawings, introduce the present invention with more detailed.
Fig. 1 shows the synoptic diagram of the display panel that uses together with the present invention.
Fig. 2 shows the synoptic diagram according to illuminator of the present invention.
Fig. 3 shows the synoptic diagram according to display device of the present invention.
Fig. 4 shows the electro-optic response figure of example illuminator.
Fig. 5 shows the set of diagrams table of the described illuminator passive matrix addressing of representative.
Fig. 6 discloses a kind of addressing scheme that is used for according to the modification of illuminator of the present invention.
Fig. 7 discloses the another kind of addressing scheme that is used for according to the modification of illuminator of the present invention.
Fig. 8 discloses the cross sectional representation of the alternate embodiments of display device of the present invention.
Fig. 9 shows the synoptic diagram according to the display device of Fig. 8.
Figure 10 shows the cross sectional representation according to another alternate embodiments of illuminator of the present invention.
Figure 11 shows the synoptic diagram of the display device of modification.
Figure 12 shows the synoptic diagram of the display device of disclosed modification among Figure 11.
Figure 13 shows the synoptic diagram of another embodiment of illuminator.
Hereinafter, will first preferred embodiment of the present invention be described in conjunction with Fig. 1, Fig. 2 and Fig. 3.
As shown in Figure 1, display panel 2 comprises electro-optically active material (such as liquid crystal material) layer 4 substantially.Under the situation that is liquid crystal layer, the ferroelectric effect that the work of described layer commutates and is listed as (IPS) or is used to modulate its glazing incident polarised direction to row (VAN), light compensated birefringence (OCB), plate inscribe based on for example twisted nematic (TN), STN Super TN (STN), homeotropic alignment.Described electro-optically active layer 4 is clipped between first and second substrates 5,6.In addition, described display panel is subdivided into voxel model, described electrode substantial transparent by a plurality of forward and backward electrodes (7,8) (for example, being arranged in the electrode in the matrix pixel style on described first substrate 5 and second substrate 6).Preferably use driven with active matrix in this case.First substrate 5 and second substrate 6 are made by light transmitting material, and same as above, electrode 7 also is light transmissive and can be made by for example tin indium oxide (ITO).By connecting line 9,10, electrode 7,8 is connected to driver element 11 to provide an electric driving voltage on described electrode 7,8, and described driving voltage is by described driver element 11 controls.In addition, display panel also comprises the polarizer 12 and analyzer 13 with known way own usually.
Illuminator 3 (see figure 2)s that the present invention relates generally to comprise optical waveguide structure 14 substantially, and compatibly comprise four end faces (end face) 16, and described optical waveguide structure 14 has the exit facet 15 that is configured to towards described display panel 2.Light source 17 (all like excellent type fluorescent lights) is disposed on the one side at least of described end face 16, and the light by described end face 16 described light emitted is configured to be coupled to waveguiding structure 14.Be equipped with reflectance coating etc. can for the waveguiding structure 14 all faces except input coupling (incoupling) end face 16 and exit facet 15, penetrate waveguide to prevent the position that light is never expected.
According to the first embodiment of the present invention, described waveguiding structure 14 consists essentially of liquid crystal material layer 18, and this liquid crystal material layer is clipped between first waveguide substrate 19 and second waveguide substrate 20.By on described liquid crystal layer 18, applying voltage, can between pellucidity and scattering state, modulate liquid crystal material.In addition, by before a plurality of and back waveguide electrode 21 and 22 described waveguides be subdivided into voxel model, described before and back waveguide electrode 21 and 22 be disposed in the matrix pixel style on described first waveguide substrate 19 and described second waveguide substrate 20.Therefore, said structure has constituted matrix-addressable light-management member, and the pixel of liquid crystal material layer 19 is changed between transmissive state and scattering state by addressing electrode 21,22, when being in described transmissive state, pixel only transmission subsequently in waveguide 14 by the light of internal reflection, and when being in scattering state, therefore light allowed to pass the exit facet 15 of waveguide 14 towards display panel 2 direction transmitted lights by the pixel scattering.In this example, matrix-addressable light-management member is the output coupling unit.But described lighting device comprises a plurality of light-management members, such as the operable output coupling unit of the present invention, reflection, scattering and redirection component.The resolution of waveguide pixel pattern can be preferably than big or big many of the resolution of display panel 2 respective pixel patterns.Waveguide electrode 21 and 22 is connected to driver element 11 so that an electric driving voltage to be provided by connecting line 23 and 24 on described electrode 21 and 22, this driving voltage is by described driver element 11 controls.Alternative scheme is to provide an independent driver element to drive described matrix waveguide.Preferred waveguide electrode 21 and 22 is a band electrode, therefore can be known as row electrode and column electrode respectively.By the row and column electrode package being contained in the waveguiding structure and controlling the voltage that is applied on the electrode, can change the scattering number of times of scattering liquid crystal gel layer on the lighting device surf zone, and make waveguide light is projected to the position that needs.Therefore, by in display device, comprising such lighting device, a large amount of light can be injected the zone that will show the highlights branch on the indicator screen of display device, and light (or not having light) is injected the zone that will show the dark-part on the indicator screen of display device in a small amount.Therefore, can improve display high-high brightness and black level (thereby improving contrast).In addition, compare,, therefore can reduce power consumption because the dark-part that does not almost have light to be shown device absorbs with the prior art LCD.
Above-mentioned waveguiding structure 14 can be glued or by other means fastened to a thicker photoconduction, for further strengthening brightness backlight, as mentioned above, can arrange reverberator or reflectance coating, arrange in the front side of waveguiding structure and be redirected sheet metal at the dorsal part of waveguiding structure.
A kind of liquid crystal material suitable, that preferably also can change between high pellucidity and scattering state is a kind of like this gel with liquid crystal structure, this gel with liquid crystal structure forms by the photopolymerization of the potpourri of non-reactive mesogen, liquid crystal monomer and light trigger, and described non-reactive mesogen itself can comprise several compositions.Before photopolymerization, potpourri is arranged in surperficial alignment layer, and this potpourri is transparent.After the photopolymerization, by the UV rayed, the netted micron-scale phase separation of condensate, the condensate network molecule has identical arrangement and preferably has same optical properties herein, promptly has equal common and extraordinary refractive index.This so-called gel with liquid crystal structure is still transparent.Only after applying electric field, non-reactive liquid crystal responds electric field by other average orientation that adapts to except that network molecule.Form under the help of many quadrants (multi-domains) in the non-reactive mesogen zone that is enhanced owing to netted existence, resulting variations in refractive index has caused this material scattering.But the zero-voltage alignment plane parallel in the ripple of in waveguide, propagating, plane perpendicular to the ripple of in waveguide, propagating or vertical with electrode surface.In the latter case, must select to have pure negative (net negative) dielectric anisotropy special liquid crystal compound so that molecules align perpendicular to line of electric force (electrical field line).In another embodiment of the present invention, the scattering liquid crystal includes the liquid crystal that is referred to as Polymer Dispersed Liquid Crystal (PDLC).Very familiar in the present technique field to the PDLC system, it is characterized in that there be not electric field action (field-off) state, in a single day the PDLC system presents scattering, just becomes transparent and apply electric field.The advantage of described LC gel and PDLC system is that described pellucidity is more clear, promptly can present scattering hardly, therefore presents higher transmission for the waveguide ray.Second advantage of described LC gel is that it is many rapidly to the response of electric field, very likely obtain the slewing rate of Millisecond, and the PDLC system changes in tens milliseconds typically.
Hereinafter, will carry out more detailed description to the driving of above-mentioned open display device.Fig. 3 shows the layout synoptic diagram of described driving.
At first, provide device 60 that the image that shows on display panel 2 is provided by picture material.Send picture material to image analysis apparatus 61, in described image analysis apparatus 61, which part of image is bright to find out, which part is dark to analyze described picture material.Use this information, control described lighting device 3 and display panel 2.Therefore, analyzed picture material is transferred into display panel control module 62, this display panel control module 62 is set makes its control be applied to signal on the display panel electrode 7,8.Analyzed picture material is transferred into illuminator control module 63 equally, in this illuminator control module 63, picture material is processed and may be converted into illuminator pixel form, and the corresponding electrode 21,22 that is transferred into illuminator 3 subsequently is to control its scattering.But the backlight intensity of illuminator means in a certain zone of other area change relatively, and the gray-scale value of the image that will show at display panel 2 also needs to change, and the change of described gray-scale value can realize by display panel control module 62.
Disclosed in WO 02/21042 as picture, lighting device 3 can combine the function of highlight with scanning backlight according to the present invention.For example hypothesis is lighted delegation at every turn, just can realize above-mentioned function combination.Because liquid crystal gel material is more faster than common LC material response, therefore use the standard passive matrix addressing can realize line scanning.Be in the state of opening (on) in the capable addressing time of only being expert at, rather than the root-mean-square value (RMS) of signal is responded.Because row by sequential addressing, therefore can be lighted delegation at every turn.
Described drive arrangement is relevant with the processing details of material behavior and scattering liquid crystal gel material, will introduce more in detail below.Fig. 4 shows described lighting device or typical electro-optical response curve backlight.The absolute value of voltage difference between the row and column electromotive force that described liquid crystal gel material applies in response to driver element 11.Liquid crystal gel material has the response time of 1ms level.As Fig. 4 as can be seen, there is a threshold voltage, material substantially transparent when being lower than this threshold voltage, and the output of the light of lighting device 3 is low.The same with the ordinary passive matrix addressing, this threshold value can be used for selecting row.In this case, can use the row of 60V to select voltage, and column signal can change (be in the state of opening (on), be in closed condition) at-30V to the scope the between+30V at 30 o'clock at+30 o'clock.If capable selected, then the pixel bias voltage is 30V to the maximum, and when selecting row, the pixel bias voltage can change between 30V to 90V.Fig. 5 schematically shows this driving method.
Between driving, the passive matrix that the ordinary passive matrix of using in the prior art drives and the present invention uses has a key distinction, the i.e. response speed of the gel with liquid crystal structure of scattering layer 18.Ordinary passive matrix drives the chronic liquid crystal material that uses the RMS value response of deviation voltage, and the RMS of described deviation voltage (greater than 1 frame) in the relatively long time averages out.In this case, in order to drive a large amount of row, just need a very steep voltage-transmission curve.But the liquid crystal gel material of using in illuminator according to the present invention is very fast, almost response simultaneously.Thereby the generation short pulse, and the number of row is not limited by the V-T curve.
A kind of typical LC gel rubber material (can use in layer according to the present invention) is made of following composition:
1. liquid crystal compound.Can select commercial LC potpourri for this reason, preferably have pure negative dielectric anisotropic and have big birefringent LC potpourri to strengthen scattering.A liquid crystal compound example promptly is the BL109 that is sold by Merck.
2. liquid crystal monomer.At D.J.Broer etc., Makromol.Chem.190, among the 3201-3215 (1989) and D.J.Broer, the light-initiated photopolymerization and the cross linkage of liquid crystal system (Photoinitiated polymerization and crosslinking ofliquid-crystalline systems) .Radiation Curing Polym.Sci.Technol (ed.Fouassier, Jean-Pierre; Rabek, J.)-Vol3., this suitable material has been described among the 383-443 (1993).In a preferred embodiment, use be liquid crystal diacrlylate, it has following chemical constitution:
Preferred concentration is between 6-12Wt%.
3. light trigger.Typical light trigger is the light trigger of commercial obtainable trade mark Irgacure 651 (Ciba Geigy) by name.Usually quantity is greatly about about the 1wt% that calculates according to the quantity of reaction monomers.
In addition, typically, the film thickness of this layer (being the box gap) is between 6 to 18 microns.According to box gap (cell gap), changing voltage is greatly between 60 to 120 volts.
But,, can require to make the light emissioning cycle long enough for obtain sufficient light output from described lighting device.Owing to this means that capable select time should long enough, so in the time of a frame, only can select restricted driving.Therefore, still having limited the resolution of lighting device, is to have limited resolution by different way but compare with the ordinary passive matrix panel that uses in the prior art.
Hereinafter use description to the addressing scheme of a kind of modification of above-mentioned open display device.By increasing capable select time the light output of described lighting device 3 is increased.Can realize the increase of row select time by the strobe pulse of overlapping continuous row, and not reduce the resolution of matrix structure, see Fig. 6.But, do like this or some consequences arranged.Owing at a time in time selected row, therefore no longer may give the value of each pixel any desired more than delegation.If use identical row or data-driven as mentioned above, then lighting device or backlight on the optical mode that illustrates will trail along column direction (smear).The number of hangover depends on the number of the row of selecting simultaneously.But, because this situation just has influence on lighting device, do not have the whole display device that influences, therefore consider this hangover situation of luminance gain or acceptable.In addition, by pre-service (for example) lighting device lighting pattern, can offset hangover to a certain extent along column direction by high-pass filtering along column direction.
Ideally, wish to select multirow in the time of abundance, to be in open mode, and do not weaken the ability that each pixel brightness level independently is set to keep it.Known in the multi-line addressing as prior art common liquid crystals display panel, this point can be by realizing with different harmonic waves or how common orthogonal signal different enforcements.Fig. 7 shows this method.Described column signal is the overlapping of different orthogonal function.Symbol has been determined that pixel is in and has been opened or closed.For this working method, harmonic frequency should be enough high so that described gel with liquid crystal structure can be only to the root-mean-square value response of driving voltage.In other words, gel with liquid crystal structure should be slower with respect to the frequency of multi-line addressing function, simultaneously again should be enough fast so that gel with liquid crystal structure can conversion between opening and closing in a frame time.Can be by this way by the maximum number of multiplexed row depend on the steepness of electro-optic response (Fig. 4) and expectation contrast (when multirow more when multiplexed, the maximum voltage of open mode reduces).T-V curve with Fig. 4 is an example, at V_ON=60V, and the V_OFF=30V place, the maximum row number of addressing simultaneously equals 3 when using maximum-contrast.
To second preferred embodiment of the present invention be described with reference to figure 8 and Fig. 9 hereinafter.
Display device 31 consists essentially of display panel 32 and illuminator 33.
Described display panel 32 is basic identical with the display panel in the above-mentioned example, thereby no longer does detailed description herein.
Figure 10 discloses an alternate embodiments.Herein, described display device 41 comprises display panel 42 and illuminator 43 substantially.
Described display panel 42 is basic identical with the display panel in the foregoing description, thereby will not be described in detail herein.
Illuminator 43 comprises the basic standard type backlight 45 that is used for bias level illumination and substantially substantially with the scattering modulator panel of opening in 45 minutes backlight 44.Described backlight 45 are clipped between described liquid crystal panel 42 and the modulator panel 44 basically.
Described backlight 45, consist essentially of waveguiding structure 46, described waveguiding structure 46 has first exit facet 47, second exit facet 48, and compatibly comprises four end faces 49, arrange described first exit facet 47 towards described display panel 42, arrange that described second exit facet 48 is towards described modulator panel 44.At least one end face along described end face 49 is arranged light source 50 (all like excellent type fluorescent lights), and the light that is provided with by described light emitted makes it be coupled to waveguiding structure 46 by described end face 49.All faces of waveguiding structure 46 except that input coupling end face 49, exit facet 47,48 all can be equipped with reflectance coating etc., penetrate waveguide with the position that stops light never to be expected.Described waveguiding structure 46 can have a conical in shape, also can be equipped with reflection control groove 57 grades to obtain to be used for the reflective-mode that is fit to of waveguide.
Constitute the scattering modulator panel 44 of matrix-addressable light-management member, consist essentially of the liquid crystal gel material layer 51 that is clipped between first substrate 52 and second substrate 53.In addition, described scattering modulator panel 44 is subdivided into voxel model by before a plurality of and the rear electrode (not shown) again such as band electrode, described a plurality of before and rear electrode be arranged to matrix pixel style on described first substrate 52 and second substrate 53.The same, the resolution of described scattering modulator panel voxel model is littler or much smaller than display panel 42 corresponding resolution.In addition, described illuminator also is equipped with catoptron 56, arranges that this catoptron 56 is clipped between described catoptron 56 and backlight 45 modulator panel 44.
Hereinafter will introduce the function of present embodiment.Light is passed transmissive end face 49 and is entered waveguiding structure 46 by light source 50 emission.In waveguiding structure 46 inside, light by pyramidal structure and reflection control groove 57 by internal reflection so that light only passes basically towards second exit facet 48 of modulator panel 44 penetrates.As above control modulator panel 44 to make some pixels be in transparent mode according to the image that will be shown panel 42 demonstrations, some pixels are in backscatter mode.Therefore, the light that enters transparent pixels will pass transparent pixels by transmission, be reflected by catoptron 56 then, get back in the waveguiding structure.On the other hand, the light that enters the scattering pixel will be scattered along the direction of waveguiding structure and do not reflected by mirror 56.
Therefore, with identical among the above-mentioned embodiment,, modulator is not arranged in waveguide inside according to present embodiment.Thereby, prevented for example ITO or the relevant absorption loss of other thin layer.But the embodiment that begins to describe with the present invention compares, and the ON/OFF brightness ratio is with little many.
Hereinafter will another favourable modification of the present invention be described with reference to Figure 11, Figure 12 and Figure 13.The target of described modification is to improve performance before the screen of above-mentioned display panels aspect contrast and colour gamut, improves efficient backlight.For this purpose, the light source power of the described illuminator of suggestion modulation makes it synchronous with scanning or highlighted scroll scattered band backlight.Like this, can make bright part backlight brighter, dark part is darker.Because light can be sent to the position that needs more efficiently, therefore make backlight more effectively, the scintigram picture is brighter.By different color (such as the red, green, blue color light source) is used identical technology respectively, can on screen, change color backlight.This way has obtained bigger available colour gamut effectively.
The embodiment of Figure 11 corresponds essentially to disclosed embodiment among Fig. 3, thereby will no longer repeat the basic function of display herein.But according to present embodiment, described display also comprises lamp driver/light source power modulator 29.Power for the lamp by lamp driver 29 modulation backlight 3 must produce needed signal.Analysis will be shown the image that panel shows, and draws intensity level backlight thus.The illuminated system control unit 63 of described subsequently intensity level is divided into the modulation signal and the light source power modulation of the scattering power of modulation middle LC gel backlight.For fully accurately, can require to comprise feedback loop, this feedback loop comprises one or more measurement actual lamp outputs and the optical sensor 28 that compares with needed output.Figure 11 schematically shows described process.Optical sensor 28 detected signals are set it is fed back to described lamp driver 29, described lamp driver 29 also is connected to receive the information from illuminator control module 63.Therefore, the power that offers pixel will change according to the picture material that is shown by pixel.Therefore, change light source power when just being addressed, can improve the contrast of display by segmented backlight.(just in scattering) power source will have power pi when section i just is being addressed, and when section j during just in scattering power source have power pj.According to the needed brightness regulation power of section I pi, the average power of backlight 3 lamp should be steady state value.By present embodiment, can realize having contrast raising, peak brightness raising, the better display device of colouristic properties.
Preferably, back light is made of light emitting devices (LED), and this device can more easily change power by effective means.In addition, LED can very rapidly change, and is subjected to the restriction of average power, therefore makes short pulse very bright.Can be alternatively, described back light can be made of the cold-cathode fluorescence lamp with different fluorescent materials or fluorescent material potpourri.
In addition, use the advantage of LED to be, can obtain commercial, therefore be particularly suitable for the combination of power and color modulation for different wavelength LED.Therefore, theory of the present invention may extend into for example independent change color monitor R, G, B light source.Described extension has been shown among Figure 12 to be changed.In this way, change the power and the color of light together.Although this mode does not increase the size of colour triangle original (color triangle), it has caused the displacement of colour triangle original.This displacement can be provided with separately each addressing section.Although in a section, use " just " colour triangle original only, increased the Color Range of whole screen.
In conjunction with the time series adjustment of colour gamut, can obtain additional the enhancing.For example, need more high brightness and the colour gamut of remaining area when even more important, can fill the color filter bandwidth at light sources of this colored region emission and make brightness additionally strengthen by connecting all simultaneously when graphical analysis is local.(see Figure 13) in another embodiment, the light output coupling of modulated scanning backlight is based on the work of electrical addressing refractive index principle, and described electrical addressing refractive index has been distinguished total reflection (no-output coupling) and transmission at the interphase place.Can make described index modulation directional correlation.This mode means that described ground floor will be modulated the R from a direction by piling up two refractive index conversion layers, G, and B, and the second layer will be modulated R ', G ', the B ' color (seeing Figure 13) that is shifted slightly from orthogonal directions.The advantage of this mode is two groups of light source R, G, and B and R ', G ', B ' can connect continuously.If use two groups of fluorescent lights but not fast conversion LED will be more favourable.Also may make the scattering part directional correlation.
Protection scope of the present invention is not limited in the embodiment that illustrates.The present invention be present in each novel characteristic and these property features each in conjunction with in.In addition, can not think that the Reference numeral in the claim is a limiting the scope of the invention.
The theory that should be noted in the discussion above that foregoing invention can be used for the dissimilar of electro-optically active display panel, such as in the display panels or in other type of light valve or shutter system.In addition, should also be noted that the present invention is not limited in monochromatic and RGB display, in any display that in fact can be applicable to have nothing to do with color.
Claims (12)
1. a display device (1) comprising:
-display panel (2), described display panel (2) has electro-optical material layer (4); First light transmissive substrate (5) of the electrode of arranging with row and column (7) is equipped with at pixel region; Second light transmissive substrate (6), described electro-optical material layer (4) be clipped between described first and second substrates (5,6) and
-illuminator (3), described illuminator (3) is disposed in the last side away from described electro-optical material layer (4) of second substrate (6), described illuminator comprises the optical waveguide (14) of light transparent materials, and described optical waveguide (14) has the exit facet (15) towards described display panel (2)
It is characterized in that,
Described illuminator (3) also comprises matrix-addressable light-management member (27).
2. the described display device of claim 1, wherein said matrix-addressable light-management member is the output coupling unit (27) that comprises liquid crystal material layer (18), row electrode layer (21) and row electrode layer (22), and described liquid crystal material layer (18) is clipped between described row electrode layer (21) and the described row electrode layer (22).
3. the described display device of claim 2, wherein said liquid crystal material layer (18) is made of liquid crystal gel material.
4. each described display device of aforementioned claim, wherein illuminator (3) also comprises light source (17), described light source (17) is disposed in one side at least of described matrix-addressable output coupling unit (27), the observer of display device sees as described, be arranged in the dorsal part of described matrix-addressable output coupling unit (27), or the observer of display device sees as described, is arranged in the front side of described matrix-addressable output coupling unit (27).
5. each described display device of aforementioned claim, also comprise driver element (11), this driver element (11) makes the image that its analysis will show on described display panel bright and dark-part is set, determine the light illumination mode that will be shown by described display device in view of the above, and produce the drive signal that is fit to substantially simultaneously and give the saltus step of not expecting in illumination that described display panel (2) produces because of light illumination mode with compensation or the color.
6. the described display device of claim 5, wherein said driver element (11) is configured to the addressing strobe pulse is offered the continuous substantially addressing band of illuminator electrode, make that for this reason the select time ratio of described strobe pulse is long divided by the frame time of addressing band quantity, thereby will make the strobe pulse of sequential addressing band overlapping.
7. the described display device of claim 5, wherein said driver element (11) is configured to provide simultaneously the two or more addressing bands of addressing strobe pulse to described illuminator electrode.
8. each described display device of aforementioned claim also comprises the bias level modulator (64) of the bias level that is configured to control described illuminator.
9. each described display device of aforementioned claim also comprises the light source power modulator (29) of the light source power that is used to modulate described illuminator (3), and this modulation depends on the shown light illumination mode of described lighting device.
10. the described display device of claim 9 wherein saidly comprises a kind of in cold-cathode fluorescence lamp, hot-cathode fluorescent lamp, white luminous diode or the combination of colorful light-emitting diode with modulated light source.
11. each described illuminator of aforementioned claim 1-10 is applicable to aforementioned each described display device of right claim 1-10.
12. the method for each described driving display device of aforementioned claim 1-10 may further comprise the steps:
-analysis will be shown the bright and dark-part of the image of panel (2) demonstration,
-will become to be suitable for the resolution of described lighting device (3) about the information translation of the bright and dark-part of analyzed image,
-will send lighting device (3) about the information of analyzed image to,
-will convert the resolution that is fit to described display panel (2) about the activation bit of described lighting device (3) to, one of the color that causes by light illumination mode with compensation and brightness do not expect saltus step and
-by the described information-driven lighting device (3) that has been converted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03100519.2 | 2003-03-03 | ||
| EP03100519 | 2003-03-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1756988A true CN1756988A (en) | 2006-04-05 |
Family
ID=32946912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004800058736A Pending CN1756988A (en) | 2003-03-03 | 2004-02-25 | A display device and an illumination system therefor |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1602003A1 (en) |
| JP (1) | JP2006519418A (en) |
| KR (1) | KR20050108375A (en) |
| CN (1) | CN1756988A (en) |
| TW (1) | TWM258239U (en) |
| WO (1) | WO2004079437A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102473380A (en) * | 2009-07-07 | 2012-05-23 | 杜比实验室特许公司 | Edge-lit local dimming displays, display components and related methods |
| CN104303099B (en) * | 2012-05-09 | 2017-05-03 | 索尼公司 | Illumination device, and display |
| WO2020000981A1 (en) * | 2018-06-28 | 2020-01-02 | 京东方科技集团股份有限公司 | Area light source module and control method therefor, and display device |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101282252B1 (en) | 2006-08-04 | 2013-07-10 | 삼성전자주식회사 | Media processing apparatus and media processing method thereof |
| CN101529491B (en) | 2006-08-14 | 2014-05-14 | 伊克西斯股份有限公司 | Video and content controlled backlight |
| WO2008032248A1 (en) | 2006-09-12 | 2008-03-20 | Koninklijke Philips Electronics N.V. | Controllable light guide |
| WO2008125926A1 (en) * | 2007-04-17 | 2008-10-23 | Koninklijke Philips Electronics N.V. | Controllable light-guide and display device |
| WO2009138924A1 (en) * | 2008-05-13 | 2009-11-19 | Koninklijke Philips Electronics N.V. | Arrangement to avoid sharp luminance edges in a segmented light output device |
| TWI383214B (en) * | 2008-10-22 | 2013-01-21 | Au Optronics Corp | Liquid crystal display structure |
| WO2011158569A1 (en) * | 2010-06-15 | 2011-12-22 | シャープ株式会社 | Photochromatic element, display device, illumination device and method of manufacturing photochromatic element |
| US8773477B2 (en) | 2010-09-15 | 2014-07-08 | Dolby Laboratories Licensing Corporation | Method and apparatus for edge lit displays |
| JP2014102295A (en) * | 2012-11-16 | 2014-06-05 | Sony Corp | Display device, display method and recording medium |
| US20140293188A1 (en) * | 2013-04-01 | 2014-10-02 | Apple Inc. | Displays with Local Dimming Elements |
| CN103207149A (en) * | 2013-04-16 | 2013-07-17 | 无锡优创生物科技有限公司 | Infrared gel positioning device and gel imaging system utilizing same |
| JP6787793B2 (en) | 2014-05-30 | 2020-11-18 | スリーエム イノベイティブ プロパティズ カンパニー | Variable viewing angle optical system |
| US9921345B2 (en) | 2014-05-30 | 2018-03-20 | 3M Innovative Properties Company | Optical systems having variable viewing angles |
| KR20180124131A (en) * | 2016-03-31 | 2018-11-20 | 코닝 인코포레이티드 | Locally dimmable light guide plates and display devices comprising same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2597641B1 (en) * | 1986-04-22 | 1989-12-08 | Thomson Csf | DEVICE FOR MODULATING THE ILLUMINATION LIGHT OF AN ELECTRO-OPTICAL DISPLAY SCREEN |
| JPH01200232A (en) * | 1988-02-04 | 1989-08-11 | Sharp Corp | Ferroelectric liquid crystal display device |
| JP3213462B2 (en) * | 1993-11-25 | 2001-10-02 | 三洋電機株式会社 | Liquid crystal display |
| JP2002182199A (en) * | 2000-12-11 | 2002-06-26 | Casio Comput Co Ltd | Back light device |
-
2004
- 2004-02-25 WO PCT/IB2004/050147 patent/WO2004079437A1/en not_active Application Discontinuation
- 2004-02-25 JP JP2006506640A patent/JP2006519418A/en not_active Withdrawn
- 2004-02-25 CN CNA2004800058736A patent/CN1756988A/en active Pending
- 2004-02-25 KR KR1020057016271A patent/KR20050108375A/en not_active Application Discontinuation
- 2004-02-25 EP EP04714408A patent/EP1602003A1/en not_active Withdrawn
- 2004-02-27 TW TW093202946U patent/TWM258239U/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102473380A (en) * | 2009-07-07 | 2012-05-23 | 杜比实验室特许公司 | Edge-lit local dimming displays, display components and related methods |
| CN102473380B (en) * | 2009-07-07 | 2014-08-13 | 杜比实验室特许公司 | Edge-lit local dimming displays, display components and related methods |
| CN104303099B (en) * | 2012-05-09 | 2017-05-03 | 索尼公司 | Illumination device, and display |
| WO2020000981A1 (en) * | 2018-06-28 | 2020-01-02 | 京东方科技集团股份有限公司 | Area light source module and control method therefor, and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050108375A (en) | 2005-11-16 |
| EP1602003A1 (en) | 2005-12-07 |
| TWM258239U (en) | 2005-03-01 |
| JP2006519418A (en) | 2006-08-24 |
| WO2004079437A1 (en) | 2004-09-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1756988A (en) | A display device and an illumination system therefor | |
| US8248555B2 (en) | Display apparatus comprises three polarizers and a polarization control element whose orientation of a transmission axis changes according to a control signal | |
| CN1270209C (en) | Display device and illumination system | |
| US20060256244A1 (en) | Display device and an illumination system therefor | |
| CN1253747C (en) | Display device | |
| US20020167624A1 (en) | Backlight for a color LCD | |
| US10283085B2 (en) | Display device and display method | |
| EP0755532B1 (en) | Display screen | |
| US20110096261A1 (en) | Display device | |
| CN101769477A (en) | Illumination device, display device, and method of manufacturing light modulator | |
| CN101713503A (en) | Illuminating device, display device, and method of manufacturing light modulation element | |
| CN102235607A (en) | Lighting device and display device | |
| JPH10186361A (en) | Display device and driving method therefor | |
| CN1725070A (en) | Liquid crystal display device | |
| CN1157423A (en) | Polarizing prism for panel type liquid crystal display front projector and optical system using polarizing prism | |
| US20060215074A1 (en) | Collimated scanning backlight device | |
| KR101536125B1 (en) | transparent display device | |
| CN1773347A (en) | Excitation fiuorescent type liquid crystal display device | |
| US7982823B1 (en) | Area active backlight with steerable backlight | |
| KR20070028522A (en) | Color display | |
| Date et al. | 52.3: Direct‐viewing Display Using Alignment‐controlled PDLC and Holographic PDLC | |
| JP2005010323A (en) | Video display device | |
| JP3195653B2 (en) | Flat display panel | |
| CN1690798A (en) | Image display structure and method for driving same | |
| JPH0743699A (en) | Transmitted light control type display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |