# US 12,217,711 B2 · Electrophoretic display device and method for electrophoretic display refreshing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,711 B2 - Document ID: US12217711B2 - Status: Granted - Kind: B2 - Application number: 18/090,089 - Filed: 2022-12-28 - Published: 2023-09-14 - Granted: 2025-02-04 - Earliest claimed: 2022-03-10 - Assignees: Hkc Corporation Limited - Applicants: HKC Corporation Limited - Inventors: Mancheng Zhou; Haoxuan Zheng - Web page: https://patentgrep.com/patent/US12217711B2 ## 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 3/2096: {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 3/3433: {using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices (using liquid crystal devices G09G3/36; using electrochromic devices G09G3/38)} - G09G 2310/0243: Details of the generation of driving signals - G09G 2310/0245: Clearing or presetting the whole screen independently of waveforms, e.g. on power-on (G09G2310/063 takes precedence) - G09G 2320/0257: Reduction of after-image effects - G09G 2320/0285: using tables for spatial correction of display data - G09G 2330/021: Power management, e.g. power saving - 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 An electrophoretic display device and a method for electrophoretic display refreshing are provided in the disclosure. The electrophoretic display device includes a display screen, a driving circuit, a driving control circuit, and a processor. The display screen includes multiple pixel units. The driving circuit is configured to generate multiple first data-voltage signals at a first time and multiple second data-voltage signals at a second time. The processor is configured to obtain and compare one of the multiple first data-voltage signals and one of the multiple second data-voltage signals that both are to be received by a same pixel unit of the multiple pixel units, to obtain a comparison result, and the processor is configured to control, according to the comparison result, the driving circuit and the driving control circuit to drive the pixel unit to work. ## Claims ### Claim 1 An electrophoretic display device, comprising a display screen, a driving circuit, a driving control circuit, and a processor, wherein the processor is directly connected to the driving circuit, the driving circuit is directly connected to the driving control circuit, the driving control circuit is directly connected to the display screen, the display screen comprises a plurality of pixel units, the driving circuit is configured to generate a plurality of first data-voltage signals at a first time and a plurality of second data-voltage signals at a second time, the processor is configured to obtain and compare one of the plurality of first data-voltage signals and one of the plurality of second data-voltage signals that both are to be received by a same pixel unit of the plurality of pixel units, to obtain a comparison result, and the processor is configured to control, according to the comparison result, the driving circuit and the driving control circuit to drive the pixel unit to work; wherein the driving control circuit comprises a first transistor, a second transistor, and a time-sequence controller, a first electrode of the first transistor is directly electronically connected to an output end of the driving circuit, a second electrode of the first transistor is directly electronically connected to a first electrode of the second transistor, a grid electrode of the first transistor is directly electronically connected to a grid electrode of the second transistor and is configured to receive a time-sequence signal generated by the time-sequence controller, and a second electrode of the second transistor is grounded, wherein the first transistor and the second transistor are complementary transistors. ### Claim 2 (depends on 1) The electrophoretic display device of claim 1, wherein on condition that the comparison result represents that the first data-voltage signal and the second data-voltage signal that both are to be received by the same pixel unit are the same, the processor is configured to control the pixel unit to be grounded through the driving control circuit, wherein a voltage of each of the first data-voltage signal and the second data-voltage signal is not equal to 0 Volt (V). ### Claim 3 (depends on 2) The electrophoretic display device of claim 2, wherein the processor is configured to establish a data-voltage-signal Look-Up Table (LUT) according to comparison results, the data-voltage-signal LUT contains a comparison result between one of the plurality of first data-voltage signals and one of the plurality of second data-voltage signals that both are to be received by each of the plurality of pixel units, and the processor is configured to control, according to the data-voltage-signal LUT, the driving circuit and the driving control circuit to drive the plurality of pixel units to work. ### Claim 4 (depends on 1) The electrophoretic display device of claim 1, wherein the processor is configured to control the time-sequence controller to generate a corresponding time-sequence signal, the time-sequence signal is indicative of controlling the first transistor to be turned off and control the second transistor to be turned on, such that the pixel unit is grounded via a channel formed by the second electrode of the second transistor and the first electrode of the second transistor. ### Claim 5 (depends on 1) The electrophoretic display device of claim 1, wherein on condition that the comparison result represents that the first data-voltage signal and the second data-voltage signal that both are to be received by the same pixel unit are different, the processor is configured to control the driving circuit and the driving control circuit to charge the pixel unit with the second data-voltage signal generated by the driving circuit. ### Claim 6 (depends on 5) The electrophoretic display device of claim 5, wherein the processor is configured to control the time-sequence controller to generate a corresponding time-sequence signal, the time-sequence signal is indicative of controlling the first transistor to be turned on and control the second transistor to be turned off, such that the pixel unit is charged with the second data-voltage signal generated by the driving circuit via a channel formed by the second electrode of the first transistor and the first electrode of the first transistor. ### Claim 7 A method for electrophoretic display refreshing, applied to an electrophoretic display device comprising a display screen, a driving circuit, a driving control circuit, and a processor, the processor being directly connected to the driving circuit, the driving circuit being directly connected to the driving control circuit, the driving control circuit being directly connected to the display screen, the display screen comprising a plurality of pixel units, the driving circuit being configured to generate a plurality of first data-voltage signals at a first time and a plurality of second data-voltage signals at a second time, the processor being configured to obtain and compare one of the plurality of first data-voltage signals and one of the plurality of second data-voltage signals that both are to be received by a same pixel unit of the plurality of pixel units, to obtain a comparison result, and the processor being configured to control, according to the comparison result, the driving circuit and the driving control circuit to drive the pixel unit to work, the method comprising: obtaining a plurality of first data-voltage signals generated by the driving circuit at a first time, and obtaining a plurality of second data-voltage signals generated by the driving circuit at a second time; comparing one of the plurality of first data-voltage signals and one of the plurality of second data-voltage signals that both are to be received by a same pixel unit of the plurality of pixel units, to obtain a comparison result; and controlling, according to the comparison result, the driving circuit and the driving control circuit to drive the pixel unit to work; wherein the driving control circuit comprises a first transistor, a second transistor, and a time-sequence controller, a first electrode of the first transistor is directly electronically connected to an output end of the driving circuit, a second electrode of the first transistor is directly electronically connected to a first electrode of the second transistor, a grid electrode of the first transistor is directly electronically connected to a grid electrode of the second transistor and is configured to receive a time-sequence signal generated by the time-sequence controller, and a second electrode of the second transistor is grounded, wherein the first transistor and the second transistor are complementary transistors. ### Claim 8 (depends on 7) The method for electrophoretic display refreshing of claim 7, wherein controlling, according to the comparison result, the driving circuit and the driving control circuit to drive the pixel unit to work comprises: on condition that the comparison result represents that the first data-voltage signal and the second data-voltage signal that both are to be received by the same pixel unit are the same, controlling the driving circuit and the driving control circuit to generate a third data-voltage signal for charging the pixel unit, wherein a voltage of the third data-voltage signal is 0 Volt (V) and a voltage of each of the first data-voltage signal and the second data-voltage signal is greater than or less than a voltage of the third data-voltage signal. ### Claim 9 (depends on 7) The method for electrophoretic display refreshing of claim 7, wherein controlling the driving circuit and the driving control circuit to generate the third data-voltage signal for charging the pixel unit comprises: controlling the time-sequence controller to generate a corresponding time-sequence signal, the time-sequence signal being indicative of controlling the first transistor to be turned off and control the second transistor to be turned on. ### Claim 10 (depends on 7) The method for electrophoretic display refreshing of claim 7, wherein controlling, according to the comparison result, the driving circuit and the driving control circuit to drive the pixel unit to work comprises: on condition that the comparison result represents that the first data-voltage signal and the second data-voltage signal that both are to be received by the same pixel unit are different, controlling the driving circuit and the driving control circuit to charge the pixel unit with the second data-voltage signal generated. ### Claim 11 (depends on 10) The method for electrophoretic display refreshing of claim 10, wherein controlling the driving circuit and the driving control circuit to charge the pixel unit with the second data-voltage signal generated comprises: controlling the time-sequence controller to generate a corresponding time-sequence signal, the time-sequence signal being indicative of controlling the first transistor to be turned on and control the second transistor to be turned off. ### Claim 12 (depends on 7) The method for electrophoretic display refreshing of claim 7, further comprising: establishing a data-voltage-signal Look-Up Table (LUT) according to comparison results; and controlling, according to the data-voltage-signal LUT, the driving circuit to drive the plurality of pixel units to work.