# US 2019/0318695 A1 · Method and device for eliminating image border of electrophoretic electronic paper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0318695 A1 - Document ID: US20190318695A1 - Status: Published application - Kind: A1 - Application number: 16/469,892 - Filed: 2017-11-08 - Published: 2019-10-17 - Earliest claimed: 2016-12-29 - Assignees: South China Normal University; Shenzhen Guohua Optoelectronics Co., Ltd.; Academy of Shenzhen Guohua Optoelectronics - Applicants: South China Normal University; Shenzhen Guohua Optoelectronics Co., Ltd.; Academy of Shenzhen Guohua Optoelectronics - Inventors: Guofu ZHOU; Li WANG; Pengfei BAI; Zichuan YI - Web page: https://patentgrep.com/patent/US20190318695A1 ## CPC - G09G 3/344: {based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167)} - G09G 3/2007: {Display of intermediate tones} - G09G 2310/06: Details of flat display driving waveforms - G09G 2320/0257: Reduction of after-image effects - G09G 2380/14: Electronic books and readers - 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 device and method for eliminating an image border of electrophoretic electronic paper includes the following steps: S1, acquiring gray-scale driving waveform information and gray-scale position information, wherein the driving waveform information comprises a level value and a duration corresponding thereof; S2, outputting regulation waveform information based on an termination level value of a first gray scale, a level duration and a starting level value of a second gray scale, wherein the regulation waveform information comprises a level value, an embedding time and an embedding position of a waveform; and S3, modifying the gray-scale driving waveform information based on the regulation waveform information, and controlling an output of a drive electrode based on the modified gray-scale driving waveform information. By using the device and method, an impact of the fringe electric field on movement of electronic paper micro-capsules is eliminated, thus effectively reducing border ghosting. ## Claims ### Claim 1 A method for eliminating an image border of electrophoretic electronic paper, comprising the following steps: S1, acquiring gray-scale driving waveform information and gray-scale position information, wherein the driving waveform information comprises a level value and a duration corresponding thereof; S2, outputting regulation waveform information based on termination level values, level durations and predetermined threshold values of the first and second gray scales, wherein the regulation waveform information comprises a level value, an embedding time and an embedding position of a waveform; and S3, modifying the gray-scale driving waveform information based on the regulation waveform information, and controlling an output of a drive electrode based on the modified gray-scale driving waveform information. ### Claim 2 (depends on 1) The method for eliminating an image border of electrophoretic electronic paper according to claim 1, wherein the step S2 comprises: calculating the difference between the termination level values of the first and second gray scales, acquiring durations of the respective termination levels, judging the difference and the level durations based on the predetermined threshold values, and outputting the regulation waveform information based on the judgment result. ### Claim 3 (depends on 1) The method for eliminating an image border of electrophoretic electronic paper according to claim 1, wherein the step S3 further comprises: storing the modified gray-scale driving waveform, and gray-scale driving waveforms of the first gray scale and the second gray scale, and marking the gray-scale driving waveforms as improved driving waveforms. ### Claim 4 (depends on 1) The method for eliminating an image border of electrophoretic electronic paper according to claim 1, wherein the level values of the driving waveforms are ±15 V and 0 V. ### Claim 5 A device for eliminating an image border of electrophoretic electronic paper, comprising: an information acquisition module configured to acquire gray-scale driving waveform information and gray-scale position information, wherein the driving waveform information comprises a level value and a duration corresponding thereof; a modification output module configured to output regulation waveform information based on termination level values, level durations and predetermined threshold values of the first and second gray scales, wherein the regulation waveform information comprises a level value, an embedding time and an embedding position of a waveform; and a drive module configured to modify the gray-scale driving waveform information based on the regulation waveform information, and control an output of a drive electrode based on the modified gray-scale driving waveform information. ### Claim 6 (depends on 5) The device for eliminating an image border of electrophoretic electronic paper according to claim 5, wherein the step S2 comprises: calculating the difference between the termination level values of the first and second gray scales, acquiring durations of the respective termination levels, judging the difference and the level durations based on the predetermined threshold values, and outputting the regulation waveform information based on the judgment result. ### Claim 7 (depends on 5) The device for eliminating an image border of electrophoretic electronic paper according to claim 5, wherein the step S3 further comprises storing the modified gray-scale driving waveform, and gray-scale driving waveforms of the first gray scale and the second gray scale, and marking the gray-scale driving waveforms as improved driving waveforms. ### Claim 8 (depends on 5) The device for eliminating an image border of electrophoretic electronic paper according to claim 5, wherein the level values of the driving waveforms are ±15 V and 0 V.