# US 11,308,836 B2 · Source driving circuit

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

- Number: US 11,308,836 B2
- Document ID: US11308836B2
- Status: Granted
- Kind: B2
- Application number: 16/717,725
- Filed: 2019-12-17
- Published: 2020-06-25
- Granted: 2022-04-19
- Earliest claimed: 2018-12-24
- Assignees: Silicon Works Co., Ltd.
- Applicants: Silicon Works Co., Ltd.
- Inventors: Yong Sung Ahn
- Web page: https://patentgrep.com/patent/US11308836B2

## CPC

- 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 3/3685: {Details of drivers for data electrodes}
- G09G 3/3275: Details of drivers for data electrodes
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit
- 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 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- 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 source driving circuit includes a first source channel configured to output a first source driving signal to a display panel; a second source channel configured to output a second source driving signal to the display panel; a first gamma circuit configured to output first gamma values to the first source channel; and a second gamma circuit configured to output second gamma values to the second source channel. The first gamma circuit may set the first gamma values to values corresponding to red or green depending on a first switching operation of a first demultiplexer of the display panel corresponding to the first source channel. The second gamma circuit may set the second gamma values to values corresponding to blue or green depending on a second switching operation of a second demultiplexer of the display panel corresponding to the second source channel.

## Claims

### Claim 1

A source driving circuit comprising:
a first source channel configured to output a first source driving signal to a display panel;
a second source channel configured to output a second source driving signal to the display panel;
a first gamma circuit configured to output first gamma values corresponding to red or green to the first source channel; and
a second gamma circuit configured to output second gamma values corresponding to blue or green to the second source channel,
wherein the first gamma circuit sets the first gamma values to values corresponding to red or green depending on a first switching operation of a first demultiplexer of the display panel corresponding to the first source channel,
wherein the second gamma circuit sets the second gamma values to values corresponding to blue or green depending on a second switching operation of a second demultiplexer of the display panel corresponding to the second source channel,
wherein the first source channel comprises:
a first digital-analog converter configured to output one of the first gamma values as a first gamma signal in response to a first digital image signal;
a first source amplifier configured to receive the first gamma signal, and output the first source driving signal in response to the first gamma signal or second gamma signal, and
wherein the first gamma signal is a signal corresponding to red or green set by the first gamma circuit, and the second gamma signal is a signal corresponding to blue or green set by the second gamma circuit, and
wherein the second gamma signal is a signal from a second source amplifier of the second source channel.

### Claim 2 (depends on 1)

The source driving circuit according to claim 1, wherein the first source channel outputs the first source driving signal as a value corresponding to ‘red and green’ or ‘blue and green’ according to change in a horizontal line of the display panel to implement rendering.

### Claim 3 (depends on 1)

The source driving circuit according to claim 1, wherein the first source amplifier comprises:
a first internal amplifier configured to output a first pull-up signal and a first pull-down signal in response to the first gamma signal;
a first output circuit configured to output the first source driving signal in response to the first pull-up signal and the first pull-down signal;
a first switch circuit positioned between the first internal amplifier and the first output circuit, and configured to transfer the first pull-up signal or a second pull-up signal from the second source amplifier of the second source channel, to the first output circuit; and
a second switch circuit positioned between the first internal amplifier and the first output circuit, and configured to transfer the first pull-down signal or a second pull-down signal from the second source amplifier, to the first output circuit.

### Claim 4 (depends on 3)

The source driving circuit according to claim 3, wherein the first and second switch circuits perform switching operations according to change in a horizontal line of the display panel.

### Claim 5 (depends on 1)

The source driving circuit according to claim 1, wherein the second source channel outputs the second source driving signal as a value corresponding to ‘blue and green’ or ‘red and green’ according to change in a horizontal line of the display panel to implement rendering.

### Claim 6 (depends on 5)

The source driving circuit according to claim 5, wherein the second source channel comprises:
a second digital-analog converter configured to output one of the second gamma values as a second gamma signal in response to a second digital image signal; and
the second source amplifier configured to receive the second gamma signal, and output the second source driving signal in response to the second gamma signal or a signal corresponding to the first gamma signal from the first source amplifier of the first source channel.

### Claim 7 (depends on 6)

The source driving circuit according to claim 6, wherein the second source amplifier comprises:
a second internal amplifier configured to output the second pull-up signal and the second pull-down signal in response to the second gamma signal;
a second output circuit configured to output the second source driving signal in response to the second pull-up signal and the second pull-down signal;
a fourth switch circuit positioned between the second internal amplifier and the second output circuit, and configured to transfer the second pull-up signal or the first pull-up signal from the first source amplifier of the first source channel, to the second output circuit; and
a fifth switch circuit positioned between the second internal amplifier and the second output circuit, and configured to transfer the second pull-down signal or the first pull-down signal from the first source amplifier, to the second output circuit.

### Claim 8 (depends on 7)

The source driving circuit according to claim 7, wherein the fourth and fifth switch circuits perform switching operations according to change in a horizontal line of the display panel.

### Claim 9

A source driving circuit comprising:
a first gamma circuit configured to set first gamma values to values corresponding to red or green;
a second gamma circuit configured to set second gamma values to values corresponding to blue or green;
a first digital-analog converter configured to output one of the first gamma values of the first gamma circuit as a first gamma signal, and formed in a first source channel; and
a second digital-analog converter configured to output one of the second gamma values of the second gamma circuit as a second gamma signal, and formed in a second source channel,
wherein the first source channel comprises:
a first source amplifier configured to receive the first gamma signal, and output the first source driving signal in response to the first gamma signal or the second gamma signal, and
wherein the first gamma signal is a signal corresponding to red or green set by the first gamma circuit, and the second gamma signal is a signal corresponding to blue or green set by the second gamma circuit, and
wherein the second gamma signal is a signal from a second source amplifier of the second source channel.

### Claim 10 (depends on 9)

The source driving circuit according to claim 9, wherein the first gamma circuit sets the first gamma values to values corresponding to red or green depending on a first switching operation of a first demultiplexer of a display panel corresponding to the first source channel.

### Claim 11 (depends on 10)

The source driving circuit according to claim 10, wherein the second gamma circuit sets the second gamma values to values corresponding to blue or green depending on a second switching operation of a second demultiplexer of the display panel corresponding to the second source channel.

### Claim 12 (depends on 9)

The source driving circuit according to claim 9,
wherein the first source channel outputs a first source driving signal corresponding to ‘red and green’ or ‘blue and green’ by an internal switching operation of the first source amplifier according to change in a horizontal line of the display panel to implement rendering.

### Claim 13 (depends on 12)

The source driving circuit according to claim 12, wherein the second source channel outputs a second source driving signal corresponding to ‘blue and green’ or ‘red and green’ by an internal switching operation of the second source amplifier according to change in a horizontal line of the display panel to implement rendering.