# US 11,114,040 B2 · Pixel driving method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,114,040 B2
- Document ID: US11114040B2
- Status: Granted
- Kind: B2
- Application number: 16/943,220
- Filed: 2020-07-30
- Published: 2021-03-04
- Granted: 2021-09-07
- Earliest claimed: 2019-08-30
- Assignees: Chengdu Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Chengdu BOE Optoelectronics Technology Co., Ltd.; BOE Technology Group Co., Ltd.
- Inventors: Dongxiao Shan
- Web page: https://patentgrep.com/patent/US11114040B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2310/0297: Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
- 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 application discloses a pixel driving method, comprising: in a pre-charging phase, turning on a second driving branch to write a preset voltage into a second data line, and then turning off the second driving branch and turning on a first driving branch to write the preset voltage into a first data line; in a first data writing phase, keeping the first driving branch to be turned on to write a first data voltage into the first data line, and then turning off the first driving branch; and in a second data writing phase, turning on the second driving branch to write a second data voltage into the second data line.

## Claims

### Claim 1

A pixel driving method applied to a display panel comprising pixels in N rows and 2M columns and 2M data lines respectively coupled to the 2M columns of pixels, the display panel further comprising M multiplexers each of which is coupled to two data lines of the 2M data lines and has a first driving branch coupled to a first one of the two data lines and a second driving branch coupled to a second one of the two data lines, the pixel driving method comprising: for each of the multiplexers,
in a pre-charging phase, turning on the second driving branch to write a preset voltage into the second data line, and turning off the second driving branch and turning on the first driving branch after the preset voltage written into the second data line is stable to write the preset voltage into the first data line;
in a first data writing phase, keeping the first driving branch to be turned on to write a first data voltage into the first data line, and turning off the first driving branch after the first data voltage written into the first data line is stable; and
in a second data writing phase, turning on the second driving branch to write a second data voltage into the second data line.

### Claim 2 (depends on 1)

The pixel driving method according to claim 1, further comprising:
in the first data writing phase, turning on at least one row of pixels among the N rows of pixels after the first data voltage written into the first data line is stable, so that the first data voltage at the first data line is written into pixels coupled to the first data line among the at least one row of pixels, and the preset voltage at the second data line is written into pixels coupled to the second data line among the at least one row of pixels; and
in the second data writing phase, keeping the at least one row of pixels to be turned on, keeping the first data voltage at the first data line to be unchanged, so that the second data voltage at the second data line is written into the pixels coupled to the second data line among the at least one row of pixels, and turning off the at least one row of pixels after the second data voltage written into the pixels coupled to the second data line among the at least one row of pixels is stable.

### Claim 3 (depends on 2)

The pixel driving method according to claim 2, further comprising:
in the second data writing phase, keeping the second driving branch to be turned on after the second data voltage written into the pixels coupled to the second data line among the at least one row of pixels is stable, until a pre-charging phase for at least another row of pixels among the N rows of pixels arrives.

### Claim 4 (depends on 1)

The pixel driving method according to claim 1, wherein the preset voltage is lower or higher than the first data voltage and the second data voltage.

### Claim 5 (depends on 1)

The pixel driving method according to claim 1, wherein the first driving branch comprises a first switching element, the second driving branch comprises a second switching element, the first switching element is turned on or turned off according to a first switching signal, and the second switching element is turned on or turned off according to a second switching signal, wherein
in the pre-charging phase, providing the first switching signal at a first level and the second switching signal at a second level, so that the first switching element is turned off and the second switching element is turned on, so as to write the preset voltage into the second data line, and providing the first switching signal at the second level and the second switching signal at the first level after the preset voltage written into the second data line is stable, so that the first switching element is turned on and the second switching element is turned off, so as to write the preset voltage into the first data line;
in the first data writing phase, providing the first switching signal at the second level and the second switching signal at the first level, and keeping the first switching element to be turned on and the second switching element to be turned off, so as to write the first data voltage into the first data line, and providing the first switching signal at the first level after the first data voltage written into the first data line is stable, so that the first switching element is turned off; and
in the second data writing phase, providing the second switching signal at the second level, so that the second switching element is turned on, so as to write the second data voltage into the second data line.

### Claim 6 (depends on 5)

The pixel driving method according to claim 5, wherein the first switching element and the second switching element are thin film transistors.

### Claim 7

A pixel driving method applied to a display panel comprising pixels in N rows and 2M columns and 2M data lines respectively coupled to the 2M columns of pixels, the display panel further comprising M multiplexers each of which is coupled to two data lines of the 2M data lines and has a first driving branch coupled to a first one of the two data lines and a second driving branch coupled to a second one of the two data lines, the pixel driving method comprising: for each of the multiplexers,
in a pre-charging phase, turning on the second driving branch to write a preset voltage into the second data line, and turning off the second driving branch after the preset voltage written into the second data line is stable;
in a first data writing phase, turning on the first driving branch to write a first data voltage into the first data line, and turning off the first driving branch after the first data voltage written into the first data line is stable; and
in a second data writing phase, turning on the second driving branch to write a second data voltage into the second data line.

### Claim 8 (depends on 7)

The pixel driving method according to claim 7, further comprising:
in the first data writing phase, turning on at least one row of pixels among the N rows of pixels after the first data voltage written into the first data line is stable, so that the first data voltage at the first data line is written into pixels coupled to the first data line among the at least one row of pixels, and the preset voltage at the second data line is written into pixels coupled to the second data line among the at least one row of pixels; and
in the second data writing phase, keeping the at least one row of pixels to be turned on, and keeping the first data voltage at the first data line to be unchanged, so that the second data voltage at the second data line is written into the pixels coupled to the second data line among the at least one row of pixels, and turning off the at least one row of pixels after the second data voltage written into the pixels coupled to the second data line among the at least one row of pixels is stable.

### Claim 9 (depends on 8)

The pixel driving method according to claim 8, further comprising:
in the second data writing phase, keeping the second driving branch to be turned on after the second data voltage written into the pixels coupled to the second data line among the at least one row of pixels is stable, until a pre-charging phase for at least another row of pixels among the N rows of pixels arrives.

### Claim 10 (depends on 7)

The pixel driving method according to claim 7, wherein the preset voltage is lower or higher than the first data voltage and the second data voltage.

### Claim 11 (depends on 7)

The pixel driving method according to claim 7, wherein the first driving branch comprises a first switching element, the second driving branch comprises a second switching element, the first switching element is turned on or turned off according to a first switching signal, and the second switching element is turned on or turned off according to a second switching signal, wherein
in the pre-charging phase, providing the first switching signal at a first level and the second switching signal at a second level, so that the first switching element is turned off and the second switching element is turned on, so as to write the preset voltage into the second data line, and providing the second switching signal at the first level after the preset voltage written into the second data line is stable, so that the second switching element is turned off;
in the first data writing phase, providing the first switching signal at the second level, so that the first switching element is turned on, so as to write the first data voltage into the first data line, and providing the first switching signal at the first level after the first data voltage written into the first data line is stable, so that the first switching element is turned off; and
in the second data writing phase, providing the second switching signal at the second level, so that the second switching element is turned on, so as to write the second data voltage into the second data line.

### Claim 12 (depends on 11)

The pixel driving method according to claim 11, wherein the first switching element and the second switching element are thin film transistors.