# US 2008/0186421 A1 · Liquid crystal display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0186421 A1 - Document ID: US20080186421A1 - Status: Published application - Kind: A1 - Application number: 12/003,420 - Filed: 2007-12-26 - Published: 2008-08-07 - Earliest claimed: 2007-02-01 - Assignees: LG.Philips LCD Co., Ltd. - Inventors: Chang Keun Park - Web page: https://patentgrep.com/patent/US20080186421A1 ## CPC - G09G 3/3614: {Control of polarity reversal in general} - G02F 1/13452: {Conductors connecting driver circuitry and terminals of panels} - G02F 1/13454: {Drivers integrated on the active matrix substrate (G02F1/136277 takes precedence)} - G09G 2310/0297: Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns - 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 A liquid crystal display device is disclosed, which can reduce a unit cost and prevent deterioration of picture quality caused by unfilled pixel cells, the liquid crystal display device comprising a liquid crystal panel including a plurality of pixel cells formed at every regions defined by ‘n’ gate lines and ‘m’ data lines, three colors alternatively arranged along the data line direction, and the same colors arranged along the gate line direction; a gate built-in circuit, built-in the liquid crystal panel, for supplying gate-on voltages to the gate lines; and a driving integrated circuit, formed in the liquid crystal panel, for driving the gate built-in circuit, inverting a polarity of video signal in the unit of each data line and at least three gate lines, and supplying the video signal having the inverted polarity to the data lines. ## Claims ### Claim 1 An LCD device comprising: a liquid crystal panel including a plurality of pixel cells formed at every regions defined by ‘n’ gate lines and ‘m’ data lines, three colors alternatively arranged along the data line direction, and the same colors arranged along the gate line direction; a gate built-in circuit, built-in the liquid crystal panel, for supplying gate-on voltages to the gate lines; and a driving integrated circuit, formed in the liquid crystal panel, for driving the gate built-in circuit, inverting a polarity of video signal in the unit of each data line and at least three gate lines, and supplying the video signal having the inverted polarity to the data lines. ### Claim 2 (depends on 1) The LCD device of claim 1, wherein the pixel cells include a pixel electrode that has a short side parallel to the data line formed shorter than a long side parallel to the gate line. ### Claim 3 (depends on 2) The LCD device of claim 2, wherein the driving integrated circuit comprises: a signal relay unit to relay input source data signals and synchronizing signals; a first power generating unit to generate a first power; a second power generating unit to generate a second power by using the first power; a common voltage generating unit to supply a common voltage to the liquid crystal panel by using the second power; a signal control unit to align the source data signal supplied from the signal relay unit to be suitable for the driving of the liquid crystal panel, and to control the inside of driving integrated circuit; a control signal generating unit to generate data control signals and gate driving signals to drive the gate integrated circuit by using the synchronizing signals supplied through the signal control unit; a voltage pull-up circuit to pull up voltage levels of the gate driving signal by using the second power, and to supply the gate driving signals having the voltage level pulled up to the gate built-in circuit; a gray scale generating unit to generate a plurality of gray scale voltages by using the first power; and a data converting unit to convert the aligned data signal supplied from the signal control unit to the video signal in response to the data control signal by using the plurality of gray scale voltages. ### Claim 4 (depends on 3) The LCD device of claim 3, wherein the signal control unit subdivides one horizontal period into first to third sub-periods; and aligns source data signal in order of first to third color data corresponding to the respective sub-periods. ### Claim 5 (depends on 4) The LCD device of claim 4, wherein the data converting unit comprises: a shift register to generate a shift signal; a latch unit to latch the aligned data according to the shift signal; a digital-analog converting unit to convert the latched data to positive and negative polarity video signals by using the plurality of gray scale voltages; a buffer unit to buffer the positive and negative polarity video signals; and a select unit to select the positive polarity or the negative polarity video signal according to a data polarity signal from the control signal generating unit, and to supply the selected video signal to the data lines through respective output channels. ### Claim 6 (depends on 5) The LCD device of claim 5, wherein the control signal generating unit generates the data polarity signal that inverts the polarity of video signal selected and output by the select unit in the unit of each data line and at least three gate lines. ### Claim 7 (depends on 1) The LCD device of claim 1, further comprising a flexible printed circuit for connecting the liquid crystal panel to an external driving system. ### Claim 8 (depends on 7) The LCD device of claim 7, wherein the flexible printed circuit includes passive elements comprised of at least one of a resistor, a capacitor and an inductor used for biasing the first power or setting up option functions of the driving integrated circuit. ### Claim 9 (depends on 7) The LCD device of claim 7, wherein the flexible printed circuit includes a common voltage varying unit comprised of at least one of a resistor and a capacitor for varying the common voltage. ### Claim 10 An LCD device comprising: a liquid crystal panel including a plurality of pixel cells formed at every regions defined by ‘n’ gate lines and ‘m’ data lines; a gate built-in circuit, built-in the liquid crystal panel, for supplying gate-on voltages to the gate lines; and a driving integrated circuit, formed in the liquid crystal panel, for driving the gate built-in circuit, and supplying video signals corresponding to the different colors in the unit of horizontal line corresponding to the gate line direction, wherein the driving integrated circuit inverts the polarity of video signal in the unit of each data line and at least three gate lines. ### Claim 11 (depends on 10) The LCD device of claim 10, wherein the pixel cells include three colors alternately arranged along the data line direction, and the adjacent three pixel cells constitute one unit pixel. ### Claim 12 (depends on 11) The LCD device of claim 11, wherein the pixel cells include a pixel electrode that has a short side parallel to the data line formed shorter than a long side parallel to the gate line. ### Claim 13 (depends on 12) The LCD device of claim 12, wherein the driving integrated circuit comprises: a signal relay unit to relay input source data signals and synchronizing signals; a first power generating unit to generate a first power; a second power generating unit to generate a second power by using the first power; a common voltage generating unit to supply a common voltage to the liquid crystal panel by using the second power; a signal control unit to align the source data signal supplied from the signal relay unit to be suitable for the driving of the liquid crystal panel, and to control the inside of driving integrated circuit; a control signal generating unit to generate data control signals and gate driving signals to drive the gate integrated circuit by using the synchronizing signals supplied through the signal control unit; a voltage pull-up circuit to pull up voltage levels of the gate driving signal by using the second power, and to supply the gate driving signals having the voltage level pulled up to the gate built-in circuit; a gray scale generating unit to generate a plurality of gray scale voltages by using the first power; and a data converting unit to convert the aligned data signal supplied from the signal control unit to the video signal response to the data control signal by using the plurality of gray scale voltages. ### Claim 14 (depends on 13) The LCD device of claim 13, wherein the driving integrated circuit comprises a clock generating unit to generate clock signals for driving the first and second power generating units; and a voltage-level setting up unit to set up levels of the first power supplied from the first power generating unit to the gray scale voltage generating unit. ### Claim 15 (depends on 13) The LCD device of claim 13, wherein the signal control unit subdivides one horizontal period into first to third sub-periods; and aligns source data signal in order of first to third color data corresponding to the respective sub-periods. ### Claim 16 (depends on 15) The LCD device of claim 15, wherein the data converting unit comprises: a shift register to generate a shift signal; a latch unit to latch the aligned data according to the shift signal; a digital-analog converting unit to convert the latched data to positive and negative polarity video signals by using the plurality of gray scale voltages; a buffer unit to buffer the positive and negative polarity video signals; and a select unit to select the positive polarity or the negative polarity video signal according to a data polarity signal from the control signal generating unit, and to supply the selected video signal to the data lines through respective output channels. ### Claim 17 (depends on 16) The LCD device of claim 16, wherein the control signal generating unit generates the data polarity signal that inverts the polarity of video signal selected and output by the select unit in the unit of data line and at least three gate lines. ### Claim 18 (depends on 10) The LCD device of claim 10, further comprising a flexible printed circuit for connecting the liquid crystal panel to an external driving system. ### Claim 19 (depends on 18) The LCD device of claim 18, wherein the flexible printed circuit includes passive elements comprised of at least one of a resistor, a capacitor and an inductor used for biasing the first power or setting up option functions of the driving integrated circuit. ### Claim 20 (depends on 18) The LCD device of claim 18, wherein the flexible printed circuit includes a common voltage varying unit comprised of at least one of a resistor and a capacitor for varying the common voltage.