# US 7,612,751 B2 · Liquid crystal display and driving apparatus thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,612,751 B2 - Document ID: US7612751B2 - Status: Granted - Kind: B2 - Application number: 11/470,393 - Filed: 2006-09-06 - Published: 2007-01-04 - Granted: 2009-11-03 - Earliest claimed: 2002-05-30 - Assignees: Samsung Electronics Co., Ltd. - Inventors: Seung-Woo Lee - Web page: https://patentgrep.com/patent/US7612751B2 ## CPC - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/2025: {the sub-frames having all the same time duration} - G09G 3/2051: {with use of a spatial dither pattern} - G09G 3/2055: {the pattern being varied in time} - G09G 2320/0285: using tables for spatial correction of display data - G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve - 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) ## Abstract A liquid crystal display, including a signal controller having a logic circuit correcting n-bit source image data inputted from an external device into m-bit first corrected data and a multilevel graying unit converting the m-bit first corrected data into second corrected data with a bit number equal to or less than n bits, and a data driver outputting data voltages corresponding to the second corrected data from the signal controller, is provided. The signal controller classifies the source image data into at least two sections and corrects the source image data into the first corrected data based on gamma correction data predetermined by gamma characteristics of the source image data for each of the at least two sections. ## Claims ### Claim 1 A liquid crystal display comprising: a liquid crystal panel assembly which displays images; a signal controller comprising a logic circuit and a multilevel graying unit, the logic circuit for classifying source image data inputted into at least two sections with respect to a boundary gray value by dividing grays and for correcting the source image data into first corrected data based on gamma correction data predetermined by gamma characteristics of the liquid crystal panel assembly, the multilevel graying unit for converting the first corrected data into second corrected data wherein a bit number of the second corrected data is less than a bit number of the first corrected data; and a data driver for outputting data voltages corresponding to the second corrected data from the signal controller, wherein the correcting of the source image data into the first corrected data is performed in a different manner for different sections, and the boundary gray value is defined as a gray value corresponding to a maximum magnitude difference between gray values of the source image data and gray values of the first corrected data. ### Claim 2 (depends on 1) The liquid crystal display of claim 1, further comprising a memory storing a parameter for correcting the source image data into the first corrected data. ### Claim 3 (depends on 2) The liquid crystal display of claim 2, wherein the memory is provided in the signal controller or external to the signal controller. ### Claim 4 (depends on 2) The liquid crystal display of claim 2, wherein the logic circuit adds a correction value obtained by the correction to the source image data multiplied by four, and converts a result of the addition into the first corrected data. ### Claim 5 (depends on 2) The liquid crystal display of claim 2, wherein the logic circuit calculates the first corrected data assuming that the gamma correction data in each of the at least two sections is linearly dependent on grays. ### Claim 6 (depends on 2) The liquid crystal display of claim 2, wherein the memory comprises a nonvolatile memory, and wherein the nonvolatile memory is provided within the signal controller. ### Claim 7 (depends on 2) The liquid crystal display of claim 2, wherein the memory is provided external to the signal controller, and wherein the signal controller further comprises a volatile memory temporarily storing the parameters stored in the memory and a memory controller loading the parameters stored in the memory to the volatile memory. ### Claim 8 (depends on 2) The liquid crystal display of claim 2, wherein the memory further comprises first and second nonvolatile memories provided in and external to the signal controller, respectively, and wherein the signal controller further comprises a volatile memory temporarily storing the parameters stored in the first and the second nonvolatile memories and a memory controller loading the parameters stored in the first and the second nonvolatile memories to the volatile memory. ### Claim 9 (depends on 1) The liquid crystal display of claim 1, wherein the bit number of the second corrected data is equal to or less than a bit number of the source image data. ### Claim 10 (depends on 1) The liquid crystal display of claim 1, wherein the bit number of the first corrected data is equal to or greater than a bit number of the source image data. ### Claim 11 A driving apparatus of a liquid crystal display, comprising: a logic circuit for classifying n-bit image data inputted from an external device into first and second sections with respect to a boundary gray value and for correcting the n-bit image data into m-bit corrected data based on gamma correction data predetermined by gamma characteristics of the n-bit image data for each of the first and the second sections; and a storage for storing operation parameters of the logic circuit, wherein the logic circuit adds correction values obtained by the correction to the n-bit image data multiplied by four and converts a result of the addition into the m-bit corrected data, and the boundary gray value is defined as a gray value corresponding to a maximum magnitude difference between gray values of the source image data and gray values of the first corrected data. ### Claim 12 A driving apparatus of a liquid crystal display, comprising: a logic circuit for classifying n-bit image data into a plurality of sections on the basis of given number of grays and for correcting the n-bit image data into m-bit corrected data based on gamma correction data predetermined by gamma characteristics of the n-bit image data for each of the sections; and a storage for storing the gamma correction data at boundary gray values of each of the sections, wherein the logic circuit converts the n-bit image data into the m-bit corrected data for each of the sections, and the boundary gray values are defined as a gray value corresponding to a maximum magnitude difference between gray values of the source image data and gray values of the first corrected data. ### Claim 13 (depends on 12) The driving apparatus of the liquid crystal display of claim 12, wherein the m-bit correction data is determined by a linear line defined by the boundary gray values for each of the sections. ### Claim 14 (depends on 12) The driving apparatus of the liquid crystal display of claim 12, wherein the logic circuit receives the n-bit image data from an external device.