# US 10,373,576 B2 · Liquid crystal display driving apparatus including pixel voltage driving circuit for providing periodical pulse high-voltage signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,373,576 B2 - Document ID: US10373576B2 - Status: Granted - Kind: B2 - Application number: 14/817,619 - Filed: 2015-08-04 - Published: 2015-11-26 - Granted: 2019-08-06 - Earliest claimed: 2009-09-28 - Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Optoelectronics Technology Co., Ltd. - Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Optoelectronics Technology Co., Ltd. - Inventors: Xiangchun Xiao; Lujiang Huangfu; Haiyu Zhao; Hongming Zhan - Web page: https://patentgrep.com/patent/US10373576B2 ## CPC - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors} - G09G 3/3688: {suitable for active matrices only} - G09G 2310/06: Details of flat display driving waveforms - G09G 2310/063: Waveforms for resetting the whole screen at once - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/0257: Reduction of after-image effects - G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction - G09G 2330/021: Power management, e.g. power saving - 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 driving apparatus including a pixel voltage driving circuit for providing a periodical pulse high-voltage signal is provided. The liquid crystal display driving apparatus includes: a gate driving unit, a source driving unit, and a gate line and a date line intersected with each other to define a pixel region, in which a pixel electrode is provided, wherein the source driving unit includes: a pixel voltage driving circuit for providing a unidirectional voltage signal applied to the pixel electrode in the pixel region and for providing a periodical pulse high-voltage signal; and a common voltage driving circuit for providing a common voltage signal which corresponds to the unidirectional voltage signal provided by the pixel voltage driving circuit. ## Claims ### Claim 1 A liquid crystal display driving apparatus comprising: a gate driving unit, a source driving unit, and a gate line and a date line intersected with each other to define a pixel region, in which a pixel electrode and a common electrode are provided, wherein the source driving unit comprises: a pixel voltage driving circuit for providing a unidirectional voltage signal applied to the pixel electrode in the pixel region and for providing a periodical pulse high-voltage signal; and a common voltage driving circuit for outputting a common voltage signal to the common electrode which corresponds to the unidirectional voltage signal provided by the pixel voltage driving circuit, the pixel voltage driving circuit being controlled by a first control signal line, wherein the unidirectional voltage signal and the periodical pulse high-voltage signal are output depending on the first control signal line, and the periodical pulse high-voltage signal is a bias voltage signal, wherein the unidirectional voltage signal is configured for displaying a required color, the pulse high-voltage signal is configured for displaying a full white or a full black frame, and the unidirectional voltage signal and the pulse high-voltage signal are alternately applied to the pixel electrode, wherein the unidirectional voltage signal applied to the pixel electrode and the common voltage signal generate an electric field which drives liquid crystal molecules to tilt in one direction. ### Claim 2 (depends on 1) The liquid crystal display driving apparatus of claim 1, wherein the pixel voltage driving circuit comprises: a resistor voltage divider circuit comprising a plurality of gamma resistors connected in series and capacitors connected with the respective gamma resistors; and a plurality groups of pixel voltage output circuits, wherein each group of pixel voltage output circuit is connected between two of the plurality of gamma resistors connected in series and comprises a first NMOS transistor and a first PMOS transistor. ### Claim 3 (depends on 2) The liquid crystal display driving apparatus of claim 2, wherein, gate electrodes of the first NMOS transistor and the first PMOS transistor are connected with the first control signal line, a source electrode of the first NMOS transistor is connected with a bias voltage signal line, a drain electrode of the first PMOS transistor is connected between two gamma resistors connected in series, a drain electrode of the first NMOS transistor is connected with a source electrode of the first PMOS transistor and outputs the unidirectional voltage signal applied to the pixel electrode. ### Claim 4 (depends on 3) The liquid crystal display driving apparatus of claim 3, wherein the bias voltage signal over the bias voltage signal line is selected from the group consisting of a first high level signal, a first low level signal and a high-low-alternating signal. ### Claim 5 (depends on 3) The liquid crystal display driving apparatus of claim 3, wherein when the bias voltage signal over the bias voltage signal line is a high-low-alternating signal, the pixel voltage driving circuit further comprises a second NMOS transistor and a second PMOS transistor. ### Claim 6 (depends on 5) The liquid crystal display driving apparatus of claim 5, wherein gate electrodes of the second NMOS transistor and the second PMOS transistor are connected with a second control signal line, a source electrode of the second NMOS transistor is connected with a second high level signal line, a drain electrode of the second PMOS transistor is connected with a second low level signal line, a drain electrode of the second NMOS transistor is connected with a source electrode of the second PMOS transistor and outputs the bias voltage signal. ### Claim 7 (depends on 1) The liquid crystal display driving apparatus of claim 1, wherein the periodical pulse high-voltage signal is an AC voltage signal.