# US 7,609,245 B2 · Liquid crystal device, method of driving the same and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,245 B2 - Document ID: US7609245B2 - Status: Granted - Kind: B2 - Application number: 12/031,291 - Filed: 2008-02-14 - Published: 2008-10-02 - Granted: 2009-10-27 - Earliest claimed: 2007-03-27 - Assignees: Seiko Epson Corporation - Inventors: Toshiyuki Kasai - Web page: https://patentgrep.com/patent/US7609245B2 ## CPC - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3688: {suitable for active matrices only} - G09G 2300/0491: Use of a bi-refringent liquid crystal, optically controlled bi-refringence [OCB] with bend and splay states, or electrically controlled bi-refringence [ECB] for controlling the color - G09G 2310/061: for resetting or blanking - G09G 2330/022: in absence of operation, e.g. no data being entered during a predetermined time - 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 device that operates in a first operation mode and a second operation mode. The liquid crystal device includes a plurality of scanning lines, a plurality of data lines, a plurality of pixel circuits, a scanning line driving device, and a data line driving device. The plurality of pixel circuits are provided at positions corresponding to intersections of the scanning line and the data lines. Each of the plurality of pixel circuits includes a liquid crystal element that has a first electrode, a second electrode, and a liquid crystal held between the first electrode and the second electrode. A first alignment, which is an initial state, and a second alignment for display are provided for the liquid crystal as an alignment state. The scanning line driving device selects the plurality of scanning lines in a predetermined order. The data line driving device supplies each of the pixel circuits corresponding to the selected one of scanning lines with a writing voltage through the corresponding data line. In the first operation mode, in one frame that includes a first period and a second period, the data line driving device outputs a gray-scale voltage corresponding to a gray-scale to be displayed as the writing voltage in the first period and outputs a first voltage, which is used for maintaining the second alignment, as the writing voltage to the data line in the second period. In the second operation mode, the data line driving device outputs a second voltage, which is used for maintaining the second alignment, as the writing voltage in all the period of the one frame. The second voltage is higher than the first voltage. ## Claims ### Claim 1 A liquid crystal device that operates in a first operation mode and a second operation mode, comprising: a plurality of scanning lines; a plurality of data lines; a plurality of pixel circuits that are provided at positions corresponding to intersections of the scanning line and the data lines, wherein each of the plurality of pixel circuits includes a liquid crystal element that has a first electrode, a second electrode, and a liquid crystal held between the first electrode and the second electrode, wherein a first alignment, which is an initial state, and a second alignment for display are provided for the liquid crystal as an alignment state; a scanning line driving device that selects the plurality of scanning lines in a predetermined order; and a data line driving device that supplies each of the pixel circuits corresponding to the selected one of scanning lines with a writing voltage through the corresponding data line, wherein in the first operation mode, in one frame that includes a first period and a second period, the data line driving device outputs a gray-scale voltage corresponding to a gray-scale to be displayed as the writing voltage in the first period and outputs a first voltage, which is used for maintaining the second alignment, as the writing voltage to the data line in the second period, wherein in the second operation mode, the data line driving device outputs a second voltage, which is used for maintaining the second alignment, as the writing voltage in all the period of the one frame, and wherein the second voltage is higher than the first voltage. ### Claim 2 (depends on 1) The liquid crystal device according to claim 1, wherein the liquid crystal is an OCB (Optical Compensated Bend) mode liquid crystal, wherein the first alignment is a splay alignment, and wherein the second alignment is a bend alignment. ### Claim 3 (depends on 1) The liquid crystal device according to claim 1, further comprising: a backlight that turns on a light in the first operation mode and that turns off a light in the second operation mode. ### Claim 4 (depends on 1) The liquid crystal device according to claim 1, wherein the data line driving device includes: a main driving device that supplies the data line with the gray-scale voltage as the writing voltage in the first operation mode; and an auxiliary driving device that supplies the data line with the second voltage as the writing voltage in the second operation mode. ### Claim 5 (depends on 4) The liquid crystal device according to claim 4, wherein the main driving device is configured to stop operating in the second operation mode. ### Claim 6 (depends on 1) The liquid crystal device according to claim 1, wherein the data line driving device includes: a main driving device that supplies the data line with the gray-scale voltage and the first voltage as the writing voltage in the first operation mode; and an auxiliary driving device that supplies the data line with the second voltage as the writing voltage in the second operation mode. ### Claim 7 (depends on 1) The liquid crystal device according to claim 1, wherein the first operation mode is a display mode in which an image is displayed, and wherein the second operation mode is a non-display mode in which no image is displayed. ### Claim 8 (depends on 1) An electronic apparatus comprising the liquid crystal device according to claim 1. ### Claim 9 A method of driving a liquid crystal device in a first operation mode and in a second operation mode, wherein the liquid crystal device includes a plurality of scanning lines, a plurality of data lines, and a plurality of pixel circuits, wherein the plurality of pixel circuits are provided at positions corresponding to intersections of the scanning line and the data lines, wherein each of the plurality of pixel circuits includes a liquid crystal element that has a first electrode, a second electrode, and a liquid crystal held between the first electrode and the second electrode, wherein a first alignment, which is an initial state, and a second alignment for display are provided for the liquid crystal as an alignment state, comprising: selecting the plurality of scanning lines in a predetermined order; supplying each of the pixel circuits corresponding to a selected one of the scanning lines with a writing voltage through the corresponding data line; in the first operation mode, outputting, in one frame that includes a first period and a second period, a gray-scale voltage corresponding to a gray-scale to be displayed as the writing voltage in the first period and outputting a first voltage, which is used for maintaining the second alignment, as the writing voltage to the data line in the second period; in the second operation mode, outputting a second voltage, which is used for maintaining the second alignment, as the writing voltage to the data line in all the period of the one frame; and setting the second voltage to be higher than the first voltage. ### Claim 10 (depends on 9) The method of driving the liquid crystal device according to claim 9, wherein the first operation mode is a display mode in which an image is displayed, and wherein the second operation mode is a non-display mode in which no image is displayed.