# US 2009/0262147 A1 · Liquid crystal display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0262147 A1 - Document ID: US20090262147A1 - Status: Published application - Kind: A1 - Application number: 12/383,731 - Filed: 2009-03-26 - Published: 2009-10-22 - Earliest claimed: 2008-03-27 - Assignees: Sony Corporation - Inventors: Hidefumi Yoshida - Web page: https://patentgrep.com/patent/US20090262147A1 ## CPC - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G02F 1/134345: {Subdivided pixels, e.g. for grey scale or redundancy} - G02F 1/136213: {Storage capacitors associated with the pixel electrode} - G02F 1/13624: {having more than one switching element per pixel} - G02F 1/13712: {the liquid crystal having negative dielectric anisotropy} - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0443: with several sub-pixels for the same colour in a pixel, not specifically used to display gradations (G09G3/364 takes precedence) - G09G 2320/0252: Improving the response speed - G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction - G09G 2320/028: by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction - G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - 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 ## Abstract The present invention provides a liquid crystal display apparatus realizing an improved view angle characteristic of luminance and higher response speed. A sub-pixel group is provided with a plurality of sub-pixels. At the time of display driving on liquid crystal elements of each pixel, space-divisional-driving which allows each of the first and the second sub-pixels to be driven separately is performed. By the space-divisional-driving, fluctuations in the gamma characteristic in the case of seeing a display screen from an oblique direction are effectively dispersed, and the view angle characteristic of luminance improves. Area of the first sub-pixel is set to be smaller than whole area of the sub-pixel group. As a result, the drive voltage to be applied to the first sub-pixel at the time of lower gray level becomes high, and response speed improves. ## Claims ### Claim 1 A liquid crystal display apparatus comprising: a plurality of pixels arranged in a matrix as a whole and each having a liquid crystal element, each of the pixels including a first sub-pixel and a sub-pixel group having a plurality of second sub-pixels, a lower gray level voltage being applied to the first sub-pixel, and higher gray level voltages with different values being applied to the second sub-pixels, respectively; and driving means for driving the liquid crystal elements in the pixels by applying drive voltage based on a video signal, wherein area of the first sub-pixel is smaller than whole area of the sub-pixel group, and the driving means drives each of the pixels based on the video signal in a manner of space-divisional-driving which allows each of the first and the second sub-pixels to be driven separately. ### Claim 2 (depends on 1) The liquid crystal display apparatus according to claim 1, wherein the sub-pixel group includes two sub-pixels, thereby each of the pixels is configured of the first sub-pixel and the two second sub-pixels. ### Claim 3 (depends on 2) The liquid crystal display apparatus according to claim 2, wherein the driving means: applies a first input-versus-output luminance characteristic, in which output luminance rises from a first input luminance position, to the first sub-pixel; applies a second input-versus-output luminance characteristic, in which output luminance rises from a second input luminance position which is higher in position than the first input luminance position, to one of the two second sub-pixels; and applies a third input-versus-output luminance characteristic, in which output luminance rises from a third input luminance position which is higher in position than the second input luminance position, to the other one of the two second sub-pixels, thereby performing the space-divisional-driving which allows each of the first and the two second sub-pixels to be driven separately. ### Claim 4 (depends on 3) The liquid crystal display apparatus according to claim 3, wherein each of the pixels includes: a first switching element for driving the first sub-pixel; a second switching element for driving the sub-pixel group; a capacitive element provided between the second switching element and the other one of the two second sub-pixels, and the driving means performs the space-divisional-driving on the first and the two second sub-pixels through using a first look-up table in which input luminance level of the video signal is associated with output luminance level to be applied to the first sub-pixel and output luminance level to be applied to the sub-pixel group. ### Claim 5 (depends on 4) The liquid crystal display apparatus according to claim 4, wherein the driving means drives each of the pixels in a line-sequential manner, and a single gate line and two data lines are provided in correspondence with each of pixels, the gate line selecting a pixel to be driven in the line-sequential manner, the two data lines supplying the drive voltage to the pixel to be driven. ### Claim 6 (depends on 4) The liquid crystal display apparatus according to claim 4, wherein the driving means drives each of the pixels in a line-sequential manner, and two gate lines and a single data line are provided in correspondence with each of pixels, the two gate lines selecting a pixel to be driven in the line-sequential manner, the single data line supplying the drive voltage to the pixel to be driven. ### Claim 7 (depends on 3) The liquid crystal display apparatus according to claim 3, wherein each of the pixels includes three switching elements for driving the first and the two second sub-pixels, respectively, and the driving means performs the space-divisional-driving on the first and the two second sub-pixels through using a second look-up table in which input luminance level of the video signal is associated with output luminance level to be applied to the first sub-pixel and output luminance level to be applied to each of the two second sub-pixels. ### Claim 8 (depends on 2) The liquid crystal display apparatus according to claim 2, wherein the area of the first sub-pixel is equal to or less than ⅓ of whole area of the pixel. ### Claim 9 (depends on 8) The liquid crystal display apparatus according to claim 8, wherein the following equation (1) is satisfied, where ‘Sa’ is area of the first sub-pixel, ‘Sb1’ is area of one of the two second sub-pixels, and ‘Sb2’ is area of the other one of the two second sub-pixels. Sa