# US 8,786,536 B2 · Liquid crystal display having line drivers with reduced need for wide bandwidth switching > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,536 B2 - Document ID: US8786536B2 - Status: Granted - Kind: B2 - Application number: 11/782,338 - Filed: 2007-07-24 - Published: 2008-01-31 - Granted: 2014-07-22 - Earliest claimed: 2006-07-25 - Assignees: Samsung Display Co., Ltd. - Applicants: Dong-Gyu Kim - Inventors: Dong-Gyu Kim - Web page: https://patentgrep.com/patent/US8786536B2 ## CPC - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3614: {Control of polarity reversal in general} - G09G 2310/0205: Simultaneous scanning of several lines in flat panels - G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes - 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 includes a substrate, a plurality of gate lines formed on the substrate, a plurality of data lines intersecting the gate lines, a plurality of thin film transistors connected to the gate lines and the data lines, a plurality of pixel electrodes connected to the thin film transistors and including a first edge parallel to the gate line and a second edge that is shorter than the first edge and is next to the first edge, and at least two gate drivers connected to mutually exclusive, interlaced subsets of the gate lines. The gate drivers may include the first gate driving circuit and the second gate driving circuit disposed opposite to each other with respect to the substrate. ## Claims ### Claim 1 A liquid crystal display comprising: a substrate; a plurality of gate lines formed on the substrate; a plurality of data lines crossing the gate lines; a plurality of thin film transistors connected to the gate lines and the data lines; a plurality of pixel electrodes connected to the thin film transistors; and at least three gate drivers each exclusively connected to a respective subset of the gate lines, the at least three gate drivers including a first gate driver, a second gate driver, and a third gate driver, wherein the first gate driver includes a first portion disposed on a first side of the liquid crystal display and a second portion disposed on a second side of the liquid crystal display, the second side being opposite to the first side, wherein the second gate driver includes a third portion disposed on the first side of the liquid crystal display and a fourth portion disposed on the second side of the liquid crystal display, wherein the third gate driver includes a fifth portion disposed on the first side of the liquid crystal display and a sixth portion disposed on the second side of the liquid crystal display, wherein the first portion and the second portion of the first gate driver are electrically connected to a first gate line, the third portion and the fourth portion of the second gate driver are electrically connected to a second gate line, and the fifth portion and the sixth portion of the third gate driver are electrically connected to a third gate line, wherein the first portion and the second portion of the first gate driver are further electrically connected to a fourth gate line, the third portion and the fourth portion of the second gate driver are further electrically connected to a fifth gate line, and the fifth portion and the sixth portion of the third gate driver are further electrically connected to a sixth gate line, wherein the second gate line and the third gate line are disposed between the first gate line and the fourth gate line in a layout view of the liquid crystal display, and wherein the fifth gate line is disposed between the fourth gate line and the sixth gate line in the layout view of the liquid crystal display, wherein the gate lines are supplied with gate signals including a gate-on voltage and a gate-off voltage, and the gate-on voltage is maintained for 3 horizontal periods. ### Claim 2 (depends on 1) The liquid crystal display of claim 1, wherein the at least three gate drivers are configured to output out-of-phase turn-on pulses to their respective subsets of the gate lines. ### Claim 3 (depends on 2) The liquid crystal display of claim 2, wherein the gate lines are supplied with gate signals including a gate-on voltage and a gate-off voltage, and the gate-on voltage is maintained for 1 horizontal period or more. ### Claim 4 (depends on 3) The liquid crystal display of claim 3 wherein the gate-on voltage is maintained for at least 2 horizontal periods. ### Claim 5 (depends on 4) The liquid crystal display of claim 4, wherein the durations of the gate-on voltages of two gate voltages applied to two gate lines adjacent to each other overlap each other. ### Claim 6 (depends on 5) The liquid crystal display of claim 5, wherein the durations of the gate-on voltages of two gate voltages applied to two gate lines adjacent to each other overlap each other for at least 1 horizontal period. ### Claim 7 (depends on 1) The liquid crystal display of claim 1, wherein the first portion and the second portion of the first gate driver are electrically connected to two opposite ends of the first gate line, the third portion and the fourth portion of the second gate driver are electrically connected to two opposite ends of the second gate line, and the fifth portion and the sixth portion of the third gate driver are electrically connected to two opposite ends of the third gate line. ### Claim 8 (depends on 7) The liquid crystal display of claim 7, wherein the first to third gate drivers are sequentially connected to the different gate lines, respectively. ### Claim 9 (depends on 1) The liquid crystal display of claim 1, wherein the gate drivers are located in the same layer as the gate lines, the data lines, and the thin film transistors. ### Claim 10 (depends on 1) The liquid crystal display of claim 1, wherein the thin film transistors adjacent to each other in a column direction are connected to the different data lines respectively every two rows. ### Claim 11 (depends on 1) The liquid crystal display of claim 1, wherein the durations of the gate-on voltages of two gate voltages applied to two gate lines adjacent to each other overlap each other for at least 1 horizontal period. ### Claim 12 (depends on 1) The liquid crystal display of claim 1, wherein the durations of the gate-on voltages of two gate voltages applied to two gate lines adjacent to each other overlap each other for 2 horizontal periods. ### Claim 13 (depends on 1) The liquid crystal display of claim 1, wherein a data voltage applied to one of the data lines has a fixed polarity. ### Claim 14 (depends on 1) The liquid crystal display of claim 1, wherein the pixel electrodes have a first edge parallel to the gate line and a second edge that is shorter than the first edge and is next to the first edge. ### Claim 15 (depends on 14) The liquid crystal display of claim 14, wherein the length of the first edge is three times the length of the second edge. ### Claim 16 A method of timely providing a gate turn-on level to respective gates of a first row of thin film transistors of a liquid crystal display and then to an adjacent second row by way of corresponding and adjacent first and second gate lines, the method comprising: using a first gate lines driver unit to supply the gate turn-on level to at least a first end of the first gate line during a first pre-charge time span immediately preceding a corresponding and predefined data voltage supplying first time slot and continuing to supply the gate turn-on level for a time extending into the predefined data voltage supplying first time slot, wherein the gate turn-on level supplied by the first gate lines driver unit has a duration greater than a horizontal line scan period that is associated with a synchronization signal, and wherein the first pre-charge time span has a duration greater than the horizontal line scan period; during said predefined data voltage supplying first time slot, supplying, on a first data line that crosses the first gate line, a corresponding first pixel-driving data voltage of a given first polarity; during the first pre-charge time span, supplying on said first data line a pixel pre-charging voltage of the same given first polarity. ### Claim 17 (depends on 16) The method of claim 16 wherein the gate turn-on level is also injected into the first end of the second gate line to serve as a pre-charge for a time extending into a predefined data voltage supplying second time slot. ### Claim 18 (depends on 16) The method of claim 16 wherein the gate turn-on level is also injected into an opposite second end of the first gate line to serve as a pre-charge for a time extending into the predefined data voltage supplying first time slot. ### Claim 19 (depends on 16) The method of claim 16 further comprising, during said predefined data voltage supplying first time slot, using a second gate lines driver unit to supply the gate turn-on level to at least a first end of the next adjacent gate line.