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171results about How to "Suppression of uneven brightness" patented technology
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Pixel circuit, display, and method for driving pixel circuit
ActiveUS20080158110A1Good effectIntuitive effectElectrical apparatusStatic indicating devicesDriving currentHemt circuits
Owner:JOLED INC
Lighting device, display device and television device
InactiveUS20130070170A1Suppress uneven brightnessSuppression of uneven brightnessTelevision system detailsNon-electric lightingLight sourceEngineering
An object of the present invention is to provide a lighting device configured to suppress uneven brightness. A backlight unit 12 according to the present invention includes LEDs 17 as light sources, a chassis 14 housing the LEDs 17 and including an opening 14b through which light from the LEDs 17 exits, an optical member 15 arranged to cover the opening 14b and face the LEDs 17, and a reflection sheet 19 arranged in the chassis 14 to face the optical member 15. A surface in the chassis 14 facing the optical member 15 includes a light source arrangement area LA in which the LEDs 17 are arranged and a light source non-arrangement area LN in which no LED 17 is arranged. The light source arrangement area LA corresponds to a low light reflectance area LRA having relatively low light reflectance, and the light source non-arrangement area LN corresponds to a high light reflectance area HRA having relatively high light reflectance.
Owner:SHARP KK
Image display apparatus and image display method
ActiveUS20090140975A1Suppression of uneven brightnessCathode-ray tube indicatorsInput/output processes for data processingLiquid-crystal displayOptical transmittance
An image display apparatus includes: a luminance modification unit configured to modify the luminance setting value so as to make a luminance difference between adjacent partial regions of a back light smaller; a luminance distribution calculation unit configured to calculate a predicted value of luminance distribution of light incident on a liquid crystal panel from the back light on the basis of the modified luminance setting value; a liquid crystal transmittance correction unit configured to correct an optical transmittance of the image signal at each pixel of the liquid crystal panel on the basis of the image signal and the luminance distribution; a back light control unit configured to control the back light on the basis of the modified luminance setting value; and a liquid crystal control unit configured to control the liquid crystal panel so that the transmittance of the image signal becomes the corrected optical transmittance.
Owner:HISENSE VISUAL TECH CO LTD
Light-Emitting Device
InactiveUS20070052634A1Suppression of uneven brightnessTransistorStatic indicating devicesDisplay deviceEngineering
There is provided an EL light-emitting device with less uneven brightness. When a drain current of a plurality of current controlling TFTs is Id, a mobility is μ, a gate capacitance per unit area is Co, a maximum gate voltage is Vgs(max), a channel width is W, a channel length is L, an average value of a threshold voltage is Vth, a deviation from the average value of the threshold voltage is ΔVth, and a difference in emission brightness of a plurality of EL elements is within a range of ±n %, a semiconductor display device is characterized in that A=2Idμ*C0A(Vgs(max)-Vth)2≦WL≦(1+n100-1)2*AΔ Vth2Δ Vth≦(1+n100-1)*A*L / W
Owner:SEMICON ENERGY LAB CO LTD
Device and method for dark field illumination
Disclosed is a dark field illumination apparatus which is capable of performing a dark field illumination which exhibits a sufficient brightness and a sufficiently suppressed unevenness in brightness. The apparatus comprises a shaping system for shaping a light beam from a light source into approximately parallel beam having a ring- shaped section; a fly-eye optical device for forming a plurality of light source images in the vicinity of its exit plane based on the approximately parallel beam, the light source images being arranged circularly; and a light collection optical system for collecting light beams from the light source images and superposing them on an object plane.
Owner:NIKON CORP
Illumination device, display device, and television receiver
InactiveCN102667311ASuppression of uneven brightnessPoint-like light sourceElectric lightingTelevision receiversLight reflection
Disclosed is an illumination device that is capable of suppressing uneven brightness. The illumination device is equipped with LEDs (17), a chassis (14) that houses the LEDs (17), and a light-reflecting sheet (22) for the chassis that is disposed on the inner surface of the chassis (14) and is capable of reflecting the light from the LEDs (17); and is characterized in that the light-reflecting sheet (22) for the chassis has a sheet bottom section (31) extending along the surface of a base plate (14a) and a sheet oblique section (32) extending from the edge of the sheet bottom section (31), in that the sheet oblique section (32) slants in relation to the sheet bottom section (31) toward the light emission side of a backlight device (12), and in that the optical reflectivity of a boundary section (F2), which is the region along the border line (L) between the sheet bottom section (31) and the sheet oblique section (32) and includes said border line (L), on the surface of the LED (17) side of the light-reflecting sheet (22) for the chassis is set higher than the optical reflectivity of separate-side neighboring sections (F1, F3) that neighbor on sides of the boundary section (F2) separated from the border line (L).
Owner:SHARP KK
Planar illumination device and display device provided with the same
InactiveUS20110299013A1Efficiency of use of light and brightnessSuppression of uneven brightnessOptical light guidesNon-linear opticsPhysicsPrism
A planar illumination device is provided that enhances the efficiency of use of light and its brightness while suppressing uneven brightness, that reduces an increase in the manufacturing cost and that can reduce the thickness of the planar illumination device. In this backlight device (planar illumination device) (20), in the light emitting surface (23b) of a light guide body (23), a plurality of prisms (23e) that gradually reduce an angle of incidence of light with respect to the back surface (23c) of the light guide body are provided, and, in the back surface (24a) of a low refractive index layer (24), a plurality of prisms (24b) that have the function of forwardly and totally reflecting light from LEDs (21) in an interface between the back surface of the low refractive index layer and an air layer are formed.
Owner:SHARP KK
Organic el display apparatus and method of fabricating organic el display apparatus
ActiveUS20130027383A1Improve luminanceShorten the timeElectrical apparatusElectroluminescent light sourcesEngineeringMaterials science
A method of fabricating an organic EL display apparatus includes: obtaining a representative current (I)-voltage (V) characteristic of a display panel including pixels each having an organic EL device and a driving transistor; dividing the display panel into a plurality of divided regions, and calculating a light-emitting efficiency and an offset luminance value for each of the divided regions calculated by an I-luminance (L) characteristic of the divided region; measuring luminance of light emitted from each of the pixels and calculating an L-V characteristic of each of the pixels; calculating an L-V characteristic of each divided region by dividing each current value of the representative I-V characteristic by light-emitting efficiency, and by adding an offset luminance value; and calculating a correction parameter for each pixel such that the L-V characteristic of each pixel is corrected to the L-V characteristic of the divided region including the pixel.
Owner:JOLED INC
Operation device and image reading apparatus
ActiveUS20110299129A1Suppress brightness unevennessSuppression of uneven brightnessMechanical apparatusElectronic switchingTouch panelLight guide
A touch panel includes a ring-like shaped light-transmissive portion. A ring-shaped diffusion surface is formed on the bottom surface of a light guide element. The ring-like shape includes a second region provided at a location corresponding to two light sources adjacent to a first region corresponding to one light source. A distance from a location of the ring-shaped light-transmissive portion to a periphery of the ring close to the light source is greater in the second region than in the first region. Light emitted from the light source and incident to the light guide element is diffusion-reflected on the diffusion surface and a part of the diffusion-reflected light illuminates the light-transmissive portion.
Owner:CANON KK
Micro lens array sheet for use in backlight device and molding roll for manufacturing such mirco lens array sheet
ActiveUS20090244713A1Easy to disassembleSuppression of uneven brightnessDiffusing elementsConfectioneryEngineeringMicro lens array
A micro lens array sheet includes a sheet type base and a plurality of micro lenses arranged on the base. The surface of each micro lens includes a convex part and a peripheral edge part. The convex part has a spherical or elliptical surface. The peripheral edge part is formed between the convex part and the base and curved in a concave shape. Since the surface of the peripheral edge part is curved in a concave shape, the flat part can be narrower than a conventional micro lens array sheet. Therefore, luminance unevenness attributable to the flat part can be suppressed.
Owner:MAXELL HLDG LTD
Organic el lighting device and method of manufacturing the same
InactiveUS20120080668A1Suppression of uneven brightnessSolid-state devicesSemiconductor/solid-state device manufacturingEffect lightEngineering
An organic EL lighting device includes a first electrode which is formed corresponding to each of the plurality of light-emitting portions on a substrate, an organic functional layer which is formed at least in a light-emitting area, a second electrode which is formed at least on the organic functional layer, and a conductive / light-scattering layer as a layer which has a conductive property and a light-scattering property, is formed on the second electrode, and is electrically connected to the second electrode. The conductive / light-scattering layer is formed of a conductive resin binder in which fine particles as transparent conductive fine particles are dispersed.
Owner:SEIKO EPSON CORP
Lighting device, display device and television receiver
ActiveUS20130188100A1Suppression of uneven brightnessLow costTelevision system detailsPicture reproducersTelevision receiversDisplay device
An object of the present invention is to realize the suppression of uneven brightness at low cost in a lighting device. A backlight unit 12 according to the present invention includes: LEDs 17 as a light source; a chassis 14 including a bottom plate 14a disposed on a side opposite to a light output side with respect to the LEDs 17 and housing the LEDs 17; and a first reflection sheet 22 reflecting light including a square-shaped bottom portion 24 disposed along the bottom plate 14a, and at least two rising portions 25 and 26 rising from at least two adjacent sides of the bottom portion 24 toward the light output side such that a seam J is formed between adjacent side edges 25a and 26a. An overhang portion 28 is formed on the side edge 25a of the first rising portion 25 of the at least two rising portions 25 and 26. The overhang portion 28 overhangs beyond the seam J in a direction from the bottom portion 24 to the second rising portion 26.
Owner:SHARP KK
EL Display Device
ActiveUS20090167645A1Decrease power resistanceIncrease costStatic indicating devicesSolid-state devicesElectricityDisplay device
A power source line 1 and a scanning line 3 are arranged on different wiring layers so as to be orthogonal to each other. In the wiring layer on which the scanning line 3 is arranged, a bypass line 111 is arranged on at least a part of a portion obtained by removing a planar position of the scanning line 3 from a planar position of the power source line 1. Contacts 121 and 122 establish electric connection between the power source line 1 and the bypass line 111. As described above, the bypass line 111 is connected to the power source line 1 in parallel, leading to decrease in resistance of the power source line 1 and suppression of unevenness in brightness at a display screen. Moreover, an additional manufacturing step for providing the bypass line 111 is unnecessary. Further, an aperture ratio is not reduced even when the bypass line 111 is provided. When the bypass line 111 is made wider than the power source line 1, a pixel circuit can be prevented from operating erroneously due to external light.
Owner:SHARP KK
Pixel circuit, display, and method for driving pixel circuit
ActiveUS7898509B2Improve display claritySimple processElectrical apparatusStatic indicating devicesDriving currentHemt circuits
There is provided a display including: a pixel array part configured to include pixel circuits arranged in a matrix, each of the pixel circuits having a drive transistor, a holding capacitor, an electro-optical element, a sampling transistor, and an initialization transistor, a drive current based on information held in the holding capacitor being produced by the drive transistor and being applied to the electro-optical element for light emission of the electro-optical element; and a controller configured to include a write scanner, a horizontal driver, and an initialization scanner.
Owner:JOLED INC
Display apparatus and display controller
ActiveUS20180330655A1Suppress luminance unevennessBig screenStatic indicating devicesGate driverEngineering
A display apparatus includes: a display panel; a gate driver that provides, to a plurality of scanning lines, scanning pulse signals for controlling pixel switches to be ON in a selection period corresponding to a pulse width thereof; a data driver that provides gradation voltage signals to a plurality of data lines; and a display controller that provides a modulated clock signal having a frequency that changes at a predetermined rate in one frame period. The gate driver sequentially provides the scanning pulse signals each having a pulse width reflecting to a clock cycle of the modulated clock signal in a predetermined order corresponding to distances from the data driver to the plurality of scanning lines. The data driver provides the gradation voltage signals in the order of providing the scanning pulse signals for every data period corresponding to the clock cycle of the modulated clock signal.
Owner:LAPIS SEMICON CO LTD
Illumination device and liquid crystal display device
InactiveUS20110304798A1Suppression of uneven brightnessQuality improvementNon-electric lightingPoint-like light sourceLiquid-crystal displayEngineering
An illumination device 10 includes a diffusion plate 13 for diffusing light emitted from light sources 17, which diffusion plate 13 is fixed on first partition walls 11 and provided on upper sides of light source blocks 18. The arrangement makes it possible to provide a high-quality illumination device and a high-quality liquid crystal display device in each of which unevenness in luminance and color is restrained so that a luminance distribution becomes constant.
Owner:SHARP KK
Display device and drive method therefor
ActiveCN103168324AHigh precisionSuppression of uneven brightnessStatic indicating devicesPower controlGate driver
Provided is a display device that can sufficiently secure a period for threshold value detection with a simple configuration and that can inhibit occurrence of luminance non-uniformity. The display device includes a plurality of pixel circuits; a gate driver circuit connected to a plurality of scanning signal lines and a plurality of control lines; and a power control circuit connected to a plurality of power lines through a common power line. Each pixel circuit includes an organic EL element, a plurality of TFTs, and a capacitor. During each frame period, after initialization and threshold value detection are collectively performed on a plurality of rows, writing and light emission are performed sequentially on a row-by-row basis. Here, in a preceding frame (first frame) of two consecutive frame periods, writing is performed in order from the first row to the nth row (ascending order). In a subsequent frame (second frame) of the two frame periods, writing is performed in order from the nth row to the first row (descending order).
Owner:SHARP KK
Electro-optical device and electronic instrument
ActiveUS20160109752A1Suppression of uneven brightnessEasy to correctProjectorsColor television detailsElectronic instrumentEngineering
Owner:SEIKO EPSON CORP
Drive circuit of active matrix type organic EL panel and organic EL display device using the same drive circuit
ActiveUS7109953B2Reduce brightness unevennessSuitableCathode-ray tube indicatorsInput/output processes for data processingActive matrixControl line
A drive current value is regulated by a current value regulator circuit of a current drive circuit provided externally of each pixel circuit, so that control lines for a program control provided in order to unify operating threshold values of drive transistors becomes unnecessary. Therefore, the number of transistors of each pixel circuit can be reduced and the circuit size of each pixel circuit can be reduced thereby.
Owner:ROHM CO LTD
Electrooptical apparatus and method of manufacturing electrooptical apparatus
InactiveUS20060220532A1Improve the immunityGood reproducibilityDischarge tube luminescnet screensElectroluminescent light sourcesLight emissionElectro-optics
An electrooptical apparatus includes a light emission element array in which a plurality of light emission elements are arranged, and a barrier rib which surrounds the light emission element array.
Owner:SEIKO EPSON CORP
Light absorbing body-containing film and backlight unit
InactiveUS20190251897A1Suppressing in-plane luminance unevennessSuppressing unevenness chromaticityStatic indicating devicesOptical filtersIn planePhosphor
Provided are a backlight unit and a light absorbing material-containing film which contains quantum dots or the like and is capable of suppressing in-plane luminance unevenness and chromaticity unevenness; and a backlight unit. The light absorbing material-containing film includes a light absorbing material-containing layer with a resin layer in which one or more concave portions discretely disposed are formed and a plurality of light absorption regions containing light absorbing bodies and disposed in the concave portions formed in the resin layer; a first substrate film laminated on one main surface of the light absorbing material-containing layer; and a second substrate film laminated on the other main surface of the light absorbing material-containing layer, where the light absorption region contains at least one phosphor that serves as the light absorbing body, and a binder.
Owner:FUJIFILM CORP
Liquid crystal display device and backlight
ActiveCN1892363ASuppression of uneven brightnessReduce the numberPlanar/plate-like light guidesPrinted circuitsLiquid-crystal displayPoint light
Owner:JAPAN DISPLAY INC +1
Image display apparatus and method for controlling the same
ActiveUS20140198123A1Improve display image qualitySuppression of uneven brightnessCathode-ray tube indicatorsPhysicsEngineering
The present invention resides in an image display apparatus for displaying an image on the basis of image data; the image display apparatus comprising light emitting unit having a plurality of light sources for performing light emission that can be independently controlled respectively; setting unit which sets light emission control blocks for controlling one light source or the plurality of light sources with a common brightness; brightness determining unit which determines the light emission brightness of each of the light emission control blocks on the basis of the image data; and control unit which controls the light emission of the light emitting unit for each of the light emission control blocks in accordance with the light emission brightness determined by the determining unit; wherein the setting unit sets a size of the light emission control block of the light emitting unit depending on an amount of motion of the image.
Owner:CANON KK
Organic el display apparatus and method of fabricating organic el display apparatus
ActiveUS20130021389A1Improve luminanceShorten the timeSparking plugsElectroluminescent light sourcesMaterials scienceTransistor
A method of fabricating an organic EL display apparatus includes: obtaining a representative current (I)-voltage (V) characteristic of a display panel including pixels each having an organic EL device and a driving transistor; dividing the display panel into a plurality of divided regions, and calculating a light-emitting efficiency and a light-emission starting current value for each of the divided regions calculated by a luminance (L)-I characteristic of the divided region; measuring luminance of light emitted from each of the pixels and calculating an L-V characteristic of each of the pixels; calculating an I-V characteristic of each pixel by dividing each luminance value of the L-V characteristic calculated for the pixel by light-emitting efficiency, and by adding a light-emission starting current value; and calculating a correction parameter for each pixel such that the I-V characteristic of each pixel is corrected to the representative I-V characteristic.
Owner:JOLED INC
Planar illumination device and display device provided with the same
InactiveCN102326020AIncrease profitIncrease brightnessPoint-like light sourceElectric lightingLight guideRefractive index
Provided is a planar illumination device wherein the use efficiency and the brightness of light are improved while suppressing the unevenness of the brightness; the increase of the manufacturing cost is suppressed; and the thickness of the planar illumination device can be reduced. In the planar illumination device (backlight device) (20), a plurality of prisms which gradually reduce the incident angle of light with respect to the back surface (23c) of the light guiding element are provided on a light emitting surface (23b) of a light guiding element (23). A plurality of prisms (24b) are formed on a back surface (24a) of a low refractive index layer (24). The prisms (24b) reflect all of the light emitted from a LED (21) at the interface between the back face of the low refractive index layer and an air layer.
Owner:SHARP KK
Lighting apparatus and image display apparatus provided therewith
InactiveCN103003620AImprove cooling effectSuppression of uneven brightnessPoint-like light sourceLighting heating/cooling arrangementsLight guideEngineering
Provided is a lighting apparatus and an image display apparatus provided therewith, wherein heat dissipation capability can be improved while maintaining structural strength, uneven brightness generated due to uneven heat distribution can be inhibited, and the image display apparatus can be made to be thinner. In a heat conductive member (6), a light-source holding section, which has a face facing a light-entering face of a light-guiding member, and a plate-formed section, which has a face facing a light-exiting face of the light-guiding member and a face facing a heat dissipation member (5), are formed adjacent to each other. At the light-source holding section, a light source (7) is arranged on the face facing the light-entering face of the light-guiding member, in a direction facing towards the light-entering face, and the face of the plate-formed section facing the heat dissipation member (5) is made to come in contact with the face of the heat dissipation member (5) facing the light-guiding member. At the plate-formed section, the center of gravity of the plate-formed section is biased in both a direction parallel to the light-entering face and a direction parallel to the light-exiting face.
Owner:SHARP KK
Light diffusion sheet for overlaying, and backlight unit
ActiveCN106842393ASuppression of uneven brightnessSuppress flickerDiffusing elementsOptical light guidesLiquid-crystal displayLiquid crystal
The objective ofthe invention is to proivde a light diffusion sheet for overlaying, which can suppress uneven brightness due to shapes of bar-shaped prism portions projecting from a prism sheet on a back surface side, and can suppress flicker due to interference of a pixel distance of a liquid crystal panel. A light diffusion sheet for overlaying is to be provided on a front face side of a prism sheet in a backlight unit of a liquid crystal display device, and has a substrate layer and a light diffusion layer overlaid on a front face side of the substrate layer, in which the light diffusion layer contains a resin matrix and resin beads dispersed in the resin matrix, wherein: a mode diameter in a volume-weighted particle size distribution of the resin beads is no less than 2.5 [mu]m and no greater than 5.5 [mu]m; a density of the resin beads per unit area is no less than 9,000 beads / mm2 and no greater than 24,000 beads / mm2; and an average thickness of the light diffusion layer is no less than 2 [mu]m and no greater than 9 [mu]m. Preferably, the coefficient of variation of particle size of volume-weighted particle size distribution of the resin beads is no less than 42%.
Owner:KEIWA INCORPORATED
Light guide film, backlight unit for ultrathin liquid crystal display device and mobile computer, and method for producing light guide film
InactiveUS20140293190A1Suppression of uneven brightnessReduce thicknessMechanical apparatusOptical articlesLiquid-crystal displayLight guide
The present invention relates to a light guide film for a backlight unit of an ultrathin liquid crystal display device, the light guide film allowing rays of light entering from an end face to exit from a front face side, and including a hard layer (17, 18) having a pencil hardness of at least HB, the hard layer (17, 18) containing a polycarbonate as a principal component, and at least one face of the hard layer being exposed, and the entire light guide film (12) having an average thickness of no less than 100 μm and no greater than 600 μm.
Owner:KEIWA INCORPORATED
Driver device for an organic el passive matrix device
InactiveUS20080291137A1Reduce power consumptionReduction suppressionElectrical apparatusStatic indicating devicesControl signalPower consumption
A driver device is provided for an organic EL passive matrix device that achieves reduction in power consumption and suppression of uneven luminance at a low cost. The driver device includes a column driver, a first row driver, a second row driver, a memory, and a power supply / control signal input. An anode of each organic EL element of the organic EL passive matrix device is connected to an output of the column driver, and cathodes in a row are connected together to an input of the row driver. In the driver device, the column driver is disposed in the vicinity of one peripheral side of the IC, and each of the row drivers is disposed in the vicinity of one of the two peripheral sides adjacent to the peripheral side at which the column driver is disposed. These three drivers are packaged on a single integrated chip (IC) chip.
Owner:FUJI ELECTRIC HLDG CO LTD
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