# US 2026/0073884 A1 · Cholesteric liquid crystal device and driving method for partially updating image of cholesteric liquid crystal device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0073884 A1 - Document ID: US20260073884A1 - Status: Published application - Kind: A1 - Application number: 19/319,503 - Filed: 2025-09-04 - Published: 2026-03-12 - Earliest claimed: 2024-09-12 - Assignees: Genetouch Corp. - Applicants: Genetouch Corp. - Inventors: Cheng-Yu CHEN; Chi LEE - Web page: https://patentgrep.com/patent/US20260073884A1 ## CPC - G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)} - G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)} - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0242: Compensation of deficiencies in the appearance of colours - G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - 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 The present invention discloses a cholesteric liquid crystal device and a driving method for partially updating an image thereof. The cholesteric liquid crystal device and the driving method partially update the color differences of a part of the pixels in the row circuit structure and maintain the color differences of the other pixels in the row circuit structure. ## Claims ### Claim 1 A driving method for partially updating an image of a cholesteric liquid crystal device, comprising steps as follows: respectively generating row driving signals and column driving signals to M row circuit structures and N column circuit structures of a cholesteric liquid crystal panel by a liquid crystal driving unit; wherein each row driving signal comprises an addressing voltage signal and a non-addressing row voltage signal, each column driving signal comprises a gray scale voltage signal and a non-addressing column voltage signal, pixels are respectively formed at intersections of the row circuit structures and the column circuit structures, and the pixels comprise at least one pixel to be updated and at least one non-updating pixel; and when performing a non-full scan mode by the liquid crystal driving unit, outputting the addressing voltage signal and the gray scale voltage signal to the at least one pixel to be updated according to an update frequency and outputting a maintaining signal to the at least one non-updating pixel to maintain a color difference between the at least one non-updating pixel and the at least one pixel to be updated by the liquid crystal driving unit; wherein a voltage difference generated on the at least one pixel to be updated and between the addressing voltage signal and the gray scale voltage signal is greater than or equal to a pixel voltage state transition value. ### Claim 2 (depends on 1) The driving method for partially updating an image of the cholesteric liquid crystal device as claimed in claim 1, wherein the maintaining signal outputted to the at least one non-updating pixel comprises the row driving signal and the column driving signal; wherein the column driving signal of the maintaining signal comprises a high impedance voltage signal. ### Claim 3 (depends on 1) The driving method for partially updating an image of the cholesteric liquid crystal device as claimed in claim 1, wherein the maintaining signal outputted to the at least one non-updating pixel comprises the row driving signal and the column driving signal; wherein the column driving signal of the maintaining signal comprises a high frequency voltage signal. ### Claim 4 (depends on 3) The driving method for partially updating an image of the cholesteric liquid crystal device as claimed in claim 3, wherein the high frequency voltage signal is generated by a timing controller according to a lookup table; wherein the timing controller generates the high frequency voltage signal according to the lookup table to the liquid crystal driving unit, and the liquid crystal driving unit generates the column driving signal of the maintaining signal according to the high frequency voltage signal. ### Claim 5 (depends on 3) The driving method for partially updating an image of the cholesteric liquid crystal device as claimed in claim 3, wherein the high frequency voltage signal is generated by the liquid crystal driving unit. ### Claim 6 (depends on 3) The driving method for partially updating an image of the cholesteric liquid crystal device as claimed in claim 3, wherein a frequency of the high frequency voltage signal is greater than 100K Hz. ### Claim 7 A cholesteric liquid crystal device, comprising: a cholesteric liquid crystal panel, having M row circuit structures and N column circuit structures; wherein pixels are respectively formed at intersections of the row circuit structures and the column circuit structures and the pixels comprise at least one pixel to be updated and at least one non-updating pixel; and a liquid crystal driving unit, connected to the cholesteric liquid crystal panel, respectively generating row driving signals and column driving signals to the M row circuit structures and the N column circuit structures of the cholesteric liquid crystal panel; wherein each row driving signal comprises an addressing voltage signal and a non-addressing row voltage signal and each column driving signal comprises a gray scale voltage signal and a non-addressing column voltage signal; when performing a non-full scan mode, outputting the addressing voltage signal and the gray scale voltage signal to the at least one pixel to be updated according to an update frequency and outputting a maintaining signal to the at least one non-updating pixel to maintain a color difference between the at least one non-updating pixel and the at least one pixel to be updated by the liquid crystal driving unit; wherein a voltage difference generated on the at least one pixel to be updated between the addressing voltage signal and the gray scale voltage signal is greater than or equal to a pixel voltage state transition value. ### Claim 8 (depends on 7) The cholesteric liquid crystal device as claimed in claim 7, wherein the liquid crystal driving unit outputs the row driving signal and the column driving signal of the maintaining signal to the at least one non-updating pixel to maintain the color difference between the at least one non-updating pixel and the at least one pixel to be updated; wherein the column driving signal comprises a high impedance voltage signal. ### Claim 9 (depends on 7) The cholesteric liquid crystal device as claimed in claim 7, wherein the liquid crystal driving unit outputs the row driving signal and the column driving signal of the maintaining signal to the at least one non-updating pixel to maintain the color difference between the at least one non-updating pixel and the at least one pixel to be updated; wherein the column driving signal comprises a high frequency voltage signal. ### Claim 10 (depends on 9) The cholesteric liquid crystal device as claimed in claim 9, wherein the high frequency voltage signal is generated by a timing controller according to a lookup table and the timing controller generates the high frequency voltage signal according to the lookup table to the liquid crystal driving unit so that the liquid crystal driving unit generates the column driving signal according to the high frequency voltage signal. ### Claim 11 (depends on 9) The cholesteric liquid crystal device as claimed in claim 9, wherein the high frequency voltage signal is generated by the liquid crystal driving unit. ### Claim 12 (depends on 9) The cholesteric liquid crystal device as claimed in claim 9, wherein a frequency of the high frequency voltage signal is greater than 100K Hz. ### Claim 13 (depends on 7) The cholesteric liquid crystal device as claimed in claim 7, wherein the addressing voltage signal comprises a display voltage signal.