# US 10,482,839 B2 · Liquid crystal display apparatus with reduced horizontal crosstalk > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,482,839 B2 - Document ID: US10482839B2 - Status: Granted - Kind: B2 - Application number: 15/168,407 - Filed: 2016-05-31 - Published: 2016-12-01 - Granted: 2019-11-19 - Earliest claimed: 2015-05-31 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: UnSeung Pyun - Web page: https://patentgrep.com/patent/US10482839B2 ## CPC - G09G 3/3688: {suitable for active matrices only} - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - G09G 2310/0232: Special driving of display border areas - G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - G09G 2320/0209: Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display - G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve - G09G 2340/0428: Gradation resolution change - 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 apparatus includes a plurality of sub-pixels configured to be operated by a gate signal transmitted from a gate driver and passing through a gate line and an image signal transmitted from a data driver and passing through a data line, a gamma voltage generator configured to supply gamma reference voltages for expressing gray levels to the data driver, a power supply unit configured to supply a first VDD signal to the gamma voltage generator and a second VDD signal to the data driver and a crosstalk compensation unit positioned between the power supply unit and the gamma voltage generator and configured to filter a ripple of the first VDD signal such that voltage of the first VDD signal is stabilized thereby reducing a level of crosstalk between the sub-pixels adjacent to one another. ## Claims ### Claim 1 A liquid crystal display apparatus, comprising: a liquid crystal display (LCD) panel including a plurality of sub-pixels configured to be operated by a gate signal provided from a gate driver via a gate line and an image signal provided from a data driver via a data line; a driving circuit board, including: a gamma voltage generator configured to supply gamma reference voltages for expressing gray levels to the data driver; a power supply unit configured to supply a first high operating voltage (VDD) signal excluding a common voltage (Vcom) to the gamma voltage generator and a second VDD signal to the data driver; and a horizontal crosstalk compensation circuit configured to filter a ripple of the first VDD signal supplied from the power supply unit on the driving circuit board such that voltage of the first VDD signal is stabilized to thereby reduce a level of crosstalk between the sub-pixels adjacent to one another; and a flexible circuit board connecting the driving circuit board with the LCD panel, wherein the data driver is on the flexible circuit board, and the gamma voltage generator supplies the gamma reference voltages to the flexible circuit board having the data driver thereon. ### Claim 2 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the horizontal crosstalk compensation circuit is positioned between the power supply unit and the gamma voltage generator. ### Claim 3 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the horizontal crosstalk compensation unit is comprised in the gamma voltage generator. ### Claim 4 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the gamma voltage generator further comprises a bank and a digital to analogue converter (DAC), the bank is configured to receive gamma reference voltages information from a controller, the digital to analogue converter is configured to receive the filtered first VDD signal by the horizontal crosstalk compensation unit and generate the gamma reference voltages. ### Claim 5 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the power supply unit, the horizontal crosstalk compensation circuit and the gamma voltage generator are on the driving circuit board, wherein a first VDD line configured to transfer the first VDD signal from the power supply unit to the gamma voltage generator is on the driving circuit board, and wherein a second VDD line configured to transfer the second VDD signal from the power supply unit to the data driver is on the driving circuit board. ### Claim 6 (depends on 5) The liquid crystal display apparatus of claim 5, wherein the horizontal crosstalk compensation circuit is configured to filter high frequency content of the first VDD signal supplied from the power supply unit and transferred through the first VDD line. ### Claim 7 (depends on 5) The liquid crystal display apparatus of claim 5, wherein the horizontal crosstalk compensation circuit is connected to the first VDD line. ### Claim 8 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the crosstalk compensation unit is configured with at least a first coil component. ### Claim 9 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the horizontal crosstalk compensation circuit filters the ripple in a current of the VDD signal while scanning a high gray level area. ### Claim 10 A circuit, comprising: a power supply unit configured to supply a high operating voltage (VDD) signal excluding a common voltage (Vcom); a first VDD line configured to transfer the VDD signal to a gamma voltage generator; a second VDD line configured to transfer the VDD signal to a data driver; and a horizontal crosstalk compensation circuit configured to filter high frequency components of the VDD signal supplied from the power supply unit on a circuit board and provided to the gamma voltage generator on the circuit board, wherein a flexible circuit board connects the circuit board with a liquid crystal display panel, and wherein the gamma voltage generator supplies the gamma reference voltages to the flexible circuit board having the data driver on the flexible circuit board. ### Claim 11 (depends on 10) The circuit of claim 10, wherein the horizontal crosstalk compensation circuit is positioned at the first VDD line. ### Claim 12 (depends on 10) The circuit of claim 10, wherein the horizontal crosstalk compensation unit is comprised in the gamma voltage generator. ### Claim 13 (depends on 10) The circuit of claim 10, wherein the gamma voltage generator further comprises a bank and a digital to analogue converter (DAC), the bank is configured to receive gamma reference voltages information from a controller, the digital to analogue converter is configured to receive the filtered VDD signal by the horizontal crosstalk compensation unit and generate gamma reference voltages. ### Claim 14 (depends on 10) The circuit of claim 10, wherein the horizontal crosstalk compensation circuit is configured to stabilize a voltage of the first VDD line. ### Claim 15 (depends on 10) The circuit of claim 10, wherein the horizontal crosstalk compensation circuit is configured with at least a first coil component. ### Claim 16 (depends on 10) The circuit of claim 10, wherein the horizontal crosstalk compensation circuit filters the ripple in a current of the VDD signal while scanning a high gray level area. ### Claim 17 An apparatus comprising: a liquid crystal display (LCD) panel configured to output images with undesirable horizontal crosstalk effects being suppressed as a result of reducing extreme changes in current that is applied in the LCD panel by using electromagnetic induction, wherein the reducing extreme changes in current is achieved by employing a high operating voltage (VDD) signal excluding a common voltage (Vcom) and having high frequency components effectively removed therefrom, wherein the VDD signal is transferred via at least one among a first dedicated VDD signal line and a second dedicated VDD signal line, respectively provided to the LCD panel from a gamma voltage generator on a driving circuit board, wherein at least one among the first and second dedicated VDD signal lines have the high frequency components effectively removed therefrom by a horizontal crosstalk compensation circuit on the driving circuit board that filters ripples from the VDD signal supplied from a power supply unit on the driving circuit board, and wherein a flexible circuit board connects the driving circuit board with the LCD panel, and wherein the flexible circuit board includes a data driver thereon, and the gamma voltage generator supplies gamma reference voltages via a gamma voltage line to the flexible circuit board having the data driver thereon. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the first dedicated VDD signal line provided on the LCD panel is configured to carry signals for the gamma voltage generator. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the second dedicated VDD signal line provided on the LCD panel is configured to carry signals for the data driver. ### Claim 20 (depends on 17) The apparatus of claim 17, wherein the horizontal crosstalk compensation circuit is positioned on the first dedicated VDD signal line. ### Claim 21 (depends on 17) The apparatus of claim 17, wherein the horizontal crosstalk compensation is configured with at least a first coil component. ### Claim 22 (depends on 17) The apparatus of claim 17, wherein the horizontal crosstalk compensation circuit filters the ripple in a current of the VDD signal while scanning a high gray level area.