# US 2021/0241692 A1 · Set-voltage generation unit, set-voltage generation method and display device

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- Number: US 2021/0241692 A1
- Document ID: US20210241692A1
- Status: Published application
- Kind: A1
- Application number: 16/957,043
- Filed: 2020-01-22
- Published: 2021-08-05
- Earliest claimed: 2019-01-25
- Assignees: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Min HE; Wenchao BAO; Chun CAO; Wei CHEN
- Web page: https://patentgrep.com/patent/US20210241692A1

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2320/0209: Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
- G09G 2320/0219: Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0295: by monitoring each display pixel
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD
- 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 disclosure provides a set-voltage generation unit, a set-voltage generation method and a display device. The set-voltage generation unit includes a voltage generation circuit. The set-voltage generation unit is configured to generate a set voltage according to a gamma main voltage such that a ratio between a variation of the set voltage and a variation of the gamma main voltage is a voltage coefficient K, and K is a positive number less than or equal to 1.

## Claims

### Claim 1

A display device comprising: M rows and N columns of pixel circuits and N set-voltage generation units;
wherein the set-voltage generation unit includes a voltage generation circuit; the set-voltage generation unit is configured to generate a set voltage according to a gamma main voltage such that a ratio between a variation of the set voltage and a variation of the gamma main voltage is a voltage coefficient K, and K is a positive number less than or equal to 1;
an output terminal of an n-th set-voltage generation unit is coupled with pixel circuits in the n-th column, and is configured to provide the set voltage for the pixel circuits in the n-th column;
wherein both M and N are integers greater than 1, n is a positive integer less than or equal to N.

### Claim 2 (depends on 1)

The display device according to claim 1, further comprising a display substrate;
wherein the pixel circuits are disposed at a display area of the display substrate; and
the set-voltage generation units are disposed at a peripheral area of the display substrate.

### Claim 3 (depends on 1)

The display device according to claim 1, further comprising a display substrate and a drive integrated circuit;
wherein the pixel circuits are disposed at a display area of the display substrate; and the set-voltage generation units are disposed in the drive integrated circuit.

### Claim 4 (depends on 1)

The display device according to claim 1, further comprising: N columns of detection lines, M rows of gate lines, N columns of data lines, M rows of compensation control lines and M rows of write control lines;
wherein the gate line is configured to output a gate drive signal, the data line is configured to output a real-time data voltage, the compensation control line is configured to input a compensation control signal, and the write control line is configured to input a write control signal;
a pixel circuit in an m-th row and an n-th column includes a light emitting element in the m-th row and the n-th column, a drive circuit in the m-th row and the n-th column, a display control circuit in the m-th row and the n-th column, a compensation control circuit in the m-th row and the n-th column, and a set-voltage write control circuit in the m-th row and the n-th column;
a drive circuit in the m-th row and the n-th column is configured to, under control of a control terminal thereof, drive the light emitting element in the m-th row and the n-th column;
a display control circuit in the m-th row and the n-th column is coupled with the control terminal of the drive circuit in the m-th row and the n-th column; and is configured to, under control of a gate drive signal output by a gate line in the m-th row, perform display driving control on the drive circuit in the m-th row and the n-th column according to a real-time data voltage of a data line in the n-th column;
a compensation control circuit in the m-th row and the n-th column is configured to, under control of a compensation control signal input by a compensation control line in the m-th row, control a first terminal of the drive circuit in the m-th row and the n-th column to be coupled with a detection line in the n-th column;
a set-voltage write control circuit in the m-th row and the n-th column is configured to, under control of a write control signal input by a write control line in the m-th row, control a set-voltage write terminal in the m-th row and the n-th column to be coupled with the detection line in the n-th column;
an n-th set-voltage generation unit is configured to write a set voltage in the m-th row and the n-th column to the set-voltage write terminal in the m-th row and the n-th column, to control writing the set voltage in the m-th row and the n-th column to the detection line in the n-th column when the set-voltage write control circuit in the m-th row and the n-th column controls the set-voltage write terminal in the m-th row and the n-th column to be coupled with the detection line in the n-th column;
wherein m is a positive integer less than or equal to M.

### Claim 5 (depends on 4)

The display device according to claim 4, wherein the compensation control circuit in the m-th row and the n-th column includes a compensation control transistor in the m-th row and the n-th column; and the set-voltage write control circuit in the m-th row and the n-th column includes a write control switch in the m-th row and the n-th column;
a control electrode of the compensation control transistor in the m-th row and the n-th column is coupled with the compensation control line in the m-th row; a first electrode of the compensation control transistor in the m-th row and the n-th column is coupled with the first terminal of the drive circuit in the m-th row and the n-th column; a second electrode of the compensation control transistor in the m-th row and the n-th column is coupled with the detection line in the n-th column;
a control terminal of the write control switch in the m-th row and the n-th column is coupled with the write control line in the m-th row; a first terminal of the write control switch in the m-th row and the n-th column is coupled with the set-voltage write terminal in the m-th row and the n-th column; a second terminal of the write control switch in the m-th row and the n-th column is coupled with the detection line in the n-th column.

### Claim 6 (depends on 4)

The display device according to claim 4, wherein the drive circuit in the m-th row and the n-th column includes a drive transistor in the m-th row and the n-th column; and the display control circuit in the m-th row and the n-th column includes a data write transistor in the m-th row and the n-th column, and a storage capacitor in the m-th row and the n-th column;
a gate electrode of the drive transistor in the m-th row and the n-th column is the control terminal of the drive circuit in the m-th row and the n-th column;
a control electrode of the data write transistor in the m-th row and the n-th column is coupled with the gate line in the m-th row; a first electrode of the data write transistor in the m-th row and the n-th column is coupled with the data line in the n-th column; a second electrode of the data write transistor in the m-th row and the n-th column is coupled with the gate electrode of the drive transistor in the m-th row and the n-th column;
a first electrode of the drive transistor in the m-th row and the n-th column is coupled with the light emitting element in the m-th row and the n-th column; a second electrode of the drive transistor in the m-th row and the n-th column is coupled with the power supply voltage terminal;
a first terminal of the storage capacitor in the m-th row and the n-th column is coupled with the gate electrode of the drive transistor in the m-th row and the n-th column; a second terminal of the storage capacitor in the m-th row and the n-th column is coupled with the first electrode of the drive transistor in the m-th row and the n-th column.

### Claim 7 (depends on 1)

The display device according to claim 1, wherein the set-voltage generation unit further includes an adjustment circuit;
the adjustment circuit is configured to adjust the voltage coefficient K to be (a+1)/B according to the real-time data voltage, wherein “a” represents a gray scale corresponding to a real-time data voltage, “B” represents a total number of gray scales, “a” is 0 or a positive integer less than “B”, and “B” is a positive integer.

### Claim 8 (depends on 1)

The display device according to claim 1, wherein the voltage generation circuit includes an operational amplifier circuit and a voltage division circuit;
the voltage division circuit is configured to divide the gamma main voltage to obtain a divided voltage, and input the divided voltage to a positive input terminal of the operational amplifier circuit;
an inverting input terminal of the operational amplifier circuit is coupled with a reference voltage terminal; the operational amplifier circuit is configured to generate the set voltage according to the divided voltage and a reference voltage input by the reference voltage terminal.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein the set-voltage generation unit further includes an adjustment circuit;
the adjustment circuit is configured to provide a voltage division adjustment signal to the voltage division circuit according to the real-time data voltage, so that the voltage division circuit controls a ratio between a variation of the divided voltage and the variation of the gamma main voltage to be equal to “b”, and then the voltage coefficient K is adjusted accordingly to be (a+1)/M, wherein “a” represents a gray scale corresponding to the real-time data voltage, “M” represents a total number of gray scales, “a” is 0 or a positive integer less than “M”, “M” is a positive integer;
“b” represents a voltage division coefficient and is equal to K/A, and A is an amplification factor of the operational amplifier circuit.

### Claim 10 (depends on 9)

The display device according to claim 9, wherein the voltage division circuit includes a first voltage division resistor and a second voltage division resistor;
a first end of the first voltage division resistor receives the gamma main voltage; a second end of the first voltage division resistor is coupled with the positive input terminal of the operational amplifier circuit;
a first end of the second voltage division resistor is coupled with the positive input terminal; a second end of the second voltage division resistor is coupled with a first voltage terminal;
resistance values of the first voltage division resistor and the second voltage division resistor are adjustable.

### Claim 11 (depends on 10)

The display device according to claim 10, wherein the voltage division adjustment signal includes a resistance value adjustment signal;
the adjustment circuit is configured to transmit the resistance value adjustment signal to the first voltage division resistor and/or the second voltage division resistor according to the real-time data voltage and the gamma main voltage, to control adjustment of a resistance value Rz1 of the first voltage division resistor and/or a resistance value Rz2 of the second voltage division resistor, thereby adjusting the voltage coefficient K;
Rz2/(Rz1+Rz2) is equal to “b”.

### Claim 12

A set-voltage generation unit comprising a voltage generation circuit;
wherein an output terminal of the set-voltage generation unit is coupled with a pixel circuit; the set-voltage generation unit is configured to generate a set voltage according to a gamma main voltage such that a ratio between a variation of the set voltage and a variation of the gamma main voltage is a voltage coefficient K, and K is a positive number less than or equal to 1.

### Claim 13 (depends on 12)

The set-voltage generation unit according to claim 12, further comprising an adjustment circuit;
wherein the adjustment circuit is configured to adjust the voltage coefficient K to be (a+1)/B according to a real-time data voltage, wherein “a” represents a gray scale corresponding to the real-time data voltage, “B” represents a total number of gray scales, “a” is 0 or a positive integer less than “B”, and “B” is a positive integer.

### Claim 14 (depends on 12)

The set-voltage generation unit according to claim 12, wherein the voltage generation circuit includes an operational amplifier circuit and a voltage division circuit;
the voltage division circuit is configured to divide the gamma main voltage to obtain a divided voltage, and input the divided voltage to a positive input terminal of the operational amplifier circuit;
an inverting input terminal of the operational amplifier circuit is coupled with a reference voltage terminal; the operational amplifier circuit is configured to generate the set voltage according to the divided voltage and a reference voltage input by the reference voltage terminal.

### Claim 15 (depends on 14)

The set-voltage generation unit according to claim 14, wherein the set-voltage generation unit further includes an adjustment circuit;
the adjustment circuit is configured to provide a voltage division adjustment signal to the voltage division circuit according to a real-time data voltage, so that the voltage division circuit controls a ratio between a variation of the divided voltage and the variation of the gamma main voltage to be equal to “b”, and then the voltage coefficient K is adjusted accordingly to be (a+1)/M, wherein “a” represents a gray scale corresponding to the real-time data voltage, “M” represents a total number of gray scales, “a” is 0 or a positive integer less than “M”, “M” is a positive integer;
“b” represents a voltage division coefficient and is equal to K/A, and A is an amplification factor of the operational amplifier circuit.

### Claim 16 (depends on 15)

The set-voltage generation unit according to claim 15, wherein the voltage division circuit includes a first voltage division resistor and a second voltage division resistor;
a first end of the first voltage division resistor receives the gamma main voltage; a second end of the first voltage division resistor is coupled with the positive input terminal of the operational amplifier circuit;
a first end of the second voltage division resistor is coupled with the positive input terminal; a second end of the second voltage division resistor is coupled with a first voltage terminal;
resistance values of the first voltage division resistor and the second voltage division resistor are adjustable.

### Claim 17 (depends on 16)

The set-voltage generation unit according to claim 16, wherein the voltage division adjustment signal includes a resistance value adjustment signal;
the adjustment circuit is configured to transmit the resistance value adjustment signal to the first voltage division resistor and/or the second voltage division resistor according to the real-time data voltage and the gamma main voltage, to control adjustment of a resistance value Rz1 of the first voltage division resistor and/or a resistance value Rz2 of the second voltage division resistor, thereby adjusting the voltage coefficient K;
Rz2/(Rz1+Rz2) is equal to “b”.

### Claim 18 (depends on 11)

A set-voltage generation method applied to the set-voltage generation unit according to claim 11, comprising:
generating, by the voltage generation circuit, a set voltage according to a gamma main voltage so that a ratio between a variation of the set voltage and a variation of the gamma main voltage is a voltage coefficient K, wherein K is a positive number less than or equal to 1.

### Claim 19 (depends on 18)

The set-voltage generation method according to claim 18, wherein the set-voltage generation unit further includes an adjustment circuit; the set-voltage generation method includes:
adjusting, by the adjustment circuit, the voltage coefficient K to be (a+1)/B according to a real-time data voltage;
wherein “a” represents a gray scale corresponding to the real-time data voltage, “B” represents a total number of gray scales, “a” is 0 or a positive integer less than “B”.

### Claim 20 (depends on 18)

The set-voltage generation method according to claim 18, wherein the voltage generation circuit includes an operational amplifier circuit and a voltage division circuit; the step of generating, by the voltage generation circuit, a set voltage according to a gamma main voltage, includes:
dividing, by the voltage division circuit, the gamma main voltage to obtain a divided voltage, and inputting the divided voltage to a positive input terminal of the operational amplifier circuit;
generating, by the operational amplifier circuit, the set voltage according to the divided voltage and a reference voltage input by a reference voltage terminal.

### Claim 21

(canceled)

### Claim 22

(canceled)