# US 11,908,402 B1 · Display device and display method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,402 B1 - Document ID: US11908402B1 - Status: Granted - Kind: B1 - Application number: 18/333,883 - Filed: 2023-06-13 - Granted: 2024-02-20 - Earliest claimed: 2022-12-19 - Assignees: Hkc Corporation Limited - Applicants: Hkc Corporation Limited - Inventors: Jianlei Li; Zhicheng Tao; Baohong Kang - Web page: https://patentgrep.com/patent/US11908402B1 ## CPC - G09G 3/3225: using an active matrix - G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 2300/0852: being a dynamic memory with more than one capacitor - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0626: for control of overall brightness - G09G 2330/021: Power management, e.g. power saving - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - G09G 2360/144: the light being ambient light - 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 display device includes: a display panel, having a plurality of pixel assemblies each including a power supply end; a timing control circuit, having a first signal output end configured to output a selection instruction signal, and a second signal output end configured to output a clock signal; and a power circuit, including a voltage generation assembly configured to generate a plurality of step voltages, a voltage selection assembly configured to select at least one step voltage from the plurality of step voltages in response to the selection instruction signal, and a voltage conversion assembly configured to determine a power supply voltage on the basis of the step voltage in response to the clock signal and to output the power supply voltage to the power supply end. ## Claims ### Claim 1 A display device, comprising: a display panel, having a plurality of pixel assemblies each comprising a power supply end; a timing control circuit, having a first signal output end configured to output a selection instruction signal, and a second signal output end configured to output a clock signal; and a power circuit, comprising a voltage generation assembly configured to generate a plurality of step voltages, a voltage selection assembly connected to the first signal output end and the voltage generation assembly and configured to select at least one step voltage from the plurality of step voltages in response to the selection instruction signal, and a voltage conversion assembly connected to the second signal output end and the voltage selection assembly, configured to determine a power supply voltage based on the step voltage in response to the clock signal, and further connected to the power supply end to output the power supply voltage to the power supply end, wherein the pixel assembly comprises an organic light-emitting diode, and the power supply end of the pixel assembly is an anode of the organic light-emitting diode; wherein the pixel assembly further includes a first response switch, a second response switch, and a capacitor, wherein the first response switch has a first end connected to a data line, a second end connected to a first end of the capacitor, and a control end connected to a scan line: wherein a first end of the second response switch is connected to an operating voltage end, a second end of the capacitor is connected to a circuit between the second response switch and the operating voltage end, and a control end of the second response switch is connected to a circuit between the second end of the first response switch and the capacitor. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the timing control circuit further has a detection signal receiving end; wherein the display device further comprises a detection circuit connected to the detection signal receiving end and configured to detect ambient brightness and to input the detected ambient brightness into the timing control circuit through the detection signal receiving end; wherein the timing control circuit is configured to generate the selection instruction signal and the clock signal according to the ambient brightness. ### Claim 3 (depends on 2) The display device according to claim 2, wherein the detection circuit is a light sensor that determines ambient brightness of the display device by receiving an amount of light around the display device. ### Claim 4 (depends on 1) The display device according to claim 1, wherein a cathode of the organic light-emitting diode is connected to the power circuit. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the anode of the organic light-emitting diode is connected to the power circuit. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the pixel assembly comprises an organic light-emitting diode, and the power supply end of the pixel assembly is a cathode of the organic light-emitting diode. ### Claim 7 (depends on 1) The display device according to claim 1, wherein the pixel assembly comprises a driving transistor, a pixel electrode, a common electrode, and a liquid crystal layer, the driving transistor has a control end connected to a scan line, a first end connected to a data line, and a second end connected to the pixel electrode, wherein the common electrode is connected to the power supply end, the pixel electrode and the common electrode are located on two sides of the liquid crystal layer, and the pixel electrode and the common electrode form a liquid crystal capacitor. ### Claim 8 (depends on 7) The display device according to claim 7, wherein the pixel assembly further comprises a common signal line insulated from the pixel electrode and connected to the power supply end, and the common signal line and the common electrode form a storage capacitor. ### Claim 9 (depends on 8) The display device according to claim 8, the liquid crystal capacitor and the storage capacitor are connected in parallel, the power circuit charges the storage capacitor, and the storage capacitor maintains the voltage of the liquid crystal capacitor through capacitive coupling. ### Claim 10 (depends on 1) The display device according to claim 1, wherein the plurality of pixel assemblies comprise a first subpixel and a second subpixel that have opposite display polarities, and the power circuit is connected to a power supply end of the first subpixel and a power supply end of the second subpixel, respectively, and is configured to provide a power supply voltage having opposite positive and negative polarities to the first subpixel and the second subpixel. ### Claim 11 (depends on 10) The display device according to claim 10, wherein the first subpixel and the second subpixel are alternately distributed on the display panel, with a same display polarity on a same data line. ### Claim 12 A display method for driving a display panel of a display device, the display panel having a plurality of pixel assemblies each comprising a power supply end, wherein the display device comprises: the display panel; a timing control circuit, having a first signal output end configured to output a selection instruction signal, and a second signal output end configured to output a clock signal; and a power circuit, comprising a voltage generation assembly configured to generate a plurality of step voltages, a voltage selection assembly connected to the first signal output end and the voltage generation assembly and configured to select at least one step voltage from the plurality of step voltages in response to the selection instruction signal, and a voltage conversion assembly connected to the second signal output end and the voltage selection assembly, configured to determine a power supply voltage based on the step voltage in response to the clock signal, and further connected to the power supply end to output the power supply voltage to the power supply end: wherein each pixel assembly further comprises an organic light-emitting diode, and the power supply end of each pixel assembly is an anode of the organic light-emitting diode; wherein each pixel assembly further includes a first response switch, a second response switch, and a capacitor, wherein the first response switch has a first end connected to a data line, a second end connected to a first end of the capacitor, and a control end connected to a scan line: wherein a first end of the second response switch is connected to an operating voltage end, a second end of the capacitor is connected to a circuit between the second response switch and the operating voltage end, and a control end of the second response switch is connected to a circuit between the second end of the first response switch and the capacitor; wherein the display method comprises: generating a selection instruction signal and a clock signal; generating a plurality of step voltages, and selecting at least one step voltage from the plurality of step voltages according to the selection instruction signal; and determining a power supply voltage based on the step voltage according to the clock signal, and outputting the power supply voltage to the power supply end. ### Claim 13 (depends on 12) The display method according to claim 12, wherein generating the selection instruction signal and the clock signal comprises: obtaining ambient brightness, and generating the selection instruction signal and the clock signal based on the ambient brightness; wherein duty cycles of the clock signals generated based on different ambient brightness are different. ### Claim 14 (depends on 13) The display method according to claim 13, wherein determining the power supply voltage based on the step voltage according to the clock signal comprises: selecting the step voltage as a reference voltage, and multiplying the duty cycle by the reference voltage to generate the power supply voltage. ### Claim 15 (depends on 14) The display method according to claim 14, wherein after determining the power supply voltage based on the step voltage according to the clock signal, the display method comprises: selecting another step voltage adjacent to the reference voltage as a superimposed voltage; wherein when a pulse period of the clock signal is less than or equal to a preset threshold, providing, at a high level, the power supply voltage to the power supply end, and providing, at a low level, the superimposed voltage to the power supply end.