Display source driver

Patent metadata

Field	Value
Publication number	US-10482804-B2
Application number	US-201715682021-A
Country	US
Kind code	B2
Filing date	Aug 21, 2017
Priority date	Apr 30, 2015
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A source driver for a display device includes a gamma voltage generation circuit, first through (2m)-th data driving circuits, and a switch circuit. The gamma voltage generation circuit generates R, G and B gamma voltages. The (2k−1)-th data driving circuits consecutively receive red image data and blue image data, and consecutively generate a R driving voltage and a B driving voltage using the R gamma voltages and B gamma voltages, respectively, during one horizontal period. The (2k)-th data driving circuits consecutively receive first green image data and second green image data, and consecutively generate a G1 driving voltage and a G2 driving voltage, respectively, using the G gamma voltages during the one horizontal period. The switch circuit outputs the R, B, G1, and G2 driving voltages through different data lines from each other based on a first selection signal and a second selection signal.

First claim

What is claimed is:

1. A gamma voltage generation circuit in a source driver for a display device, the gamma voltage generation circuit comprising:
a first gamma voltage generator configured to generate R gamma voltages and B gamma voltages alternately during one horizontal period based on a gamma selection signal, and to provide the R gamma voltages and the B gamma voltages to a first group of data driving circuits; and
a second gamma voltage generator configured to generate G gamma voltages, and to provide the G gamma voltages to a second group of data driving circuits different from the first group of data driving circuits.

2. The gamma voltage generation circuit of claim 1 , wherein the gamma selection signal has a first logic level during a first half of the one horizontal period, and has a second logic level during a second half of the one horizontal period.

3. The gamma voltage generation circuit of claim 1 , wherein the first group of data driving circuits correspond to (2k−1)-th data driving circuits, the second group of data driving circuits correspond to (2k)-th data driving circuits, k is all positive integers equal to or smaller than m, and m is a positive integer.

4. The gamma voltage generation circuit of claim 1 , wherein the second gamma voltage generator is configured to continuously generate the G gamma voltages during the one horizontal period.

5. A source driver for a display device, comprising:
a gamma voltage generation circuit configured to generate R gamma voltages, G gamma voltages, and B gamma voltages;
a first group of data driving circuits configured to consecutively receive both red image data and blue image data during one horizontal period, and to consecutively generate both a R driving voltage and a B driving voltage, which correspond to the red image data and the blue image data, using the R gamma voltages and the B gamma voltages, respectively, during the one horizontal period; and
a second group of data driving circuits configured to consecutively receive both first green image data and second green image data during the one horizontal period, and to consecutively generate both a G1 driving voltage and a G2 driving voltage, which correspond to the first green image data and the second green image data, respectively, using the G gamma voltages during the one horizontal period.

6. The source driver of claim 5 , wherein the first group of data driving circuits consecutively output the R driving voltage and the B driving voltage to switch circuit during an odd horizontal period and sequentially output the B driving voltage and the R driving voltage to switch circuit during an even horizontal period successive to the odd horizontal period.

7. The source driver of claim 5 , wherein the first group of data driving circuits consecutively output the R driving voltage and the B driving voltage to switch circuit during an odd horizontal period and consecutively output the R driving voltage and the B driving voltage to the switch circuit during an even horizontal period successive to the odd horizontal period.

8. The source driver of claim 5 , wherein the first group of data driving circuits correspond to (2k−1)-th data driving circuits, the second group of data driving circuits correspond to (2k)-th data driving circuits, k is all positive integers equal to or smaller than m, and m is a positive integer, and
wherein the order in which each of the (2k−1)-th data driving circuits receives the red image data and the blue image data during an odd horizontal period is opposite to the order in which each of the (2k−1)-th data driving circuits receives the red image data and the blue image data during an even horizontal period.

9. The source driver of claim 5 , wherein the first group of data driving circuits correspond to (2k−1)-th data driving circuits, the second group of data driving circuits correspond to (2k)-th data driving circuits, k is all positive integers equal to or smaller than m, and m is a positive integer, and
wherein the order in which each of the (2k−1)-th data driving circuits receives the red image data and the blue image data during an odd horizontal period is the same as the order in which each of the (2k−1)-th data driving circuits receives the red image data and the blue image data during an even horizontal period.

10. The source driver of claim 5 , wherein the gamma voltage generation circuit includes:
a first gamma voltage generator configured to generate R gamma voltages and B gamma voltages alternately during one horizontal period based on a logic level of a gamma selection signal, and to provide the R gamma voltages and the B gamma voltages to the first group of data driving circuits; and
a second gamma voltage generator configured to generate G gamma voltages, and to provide the G gamma voltages to the second group of data driving circuits.

11. The source driver of claim 5 , further comprising:
a data latch circuit configured to receive the red image data, the first green image data, the second green image data, and the blue image data, to consecutively provide the red image data and the blue image data to the first group of data driving circuits during the one horizontal period, and to consecutively provide the first green image data and the second green image data to the second group of data driving circuits during the one horizontal period.

12. A display device, comprising:
a display panel including red subpixels, green subpixels, and blue subpixels coupled to a plurality of gate lines and a plurality of data lines;
a gate driver configured to consecutively select the plurality of gate lines;
a source driver configured to provide a plurality of driving voltages to the plurality of data lines; and
a controller configured to control the gate driver and the source driver, and to provide image data to the source driver,
wherein the source driver includes a plurality of data driving circuits, the number of which is smaller than the number of the plurality of data lines,
a first group of data driving circuits of the plurality of data driving circuits generate both a R driving voltage and a B driving voltage, which correspond to red image data and blue image data, respectively, that are consecutively received during one horizontal period, consecutively during the one horizontal period, and provide the R driving voltage and the B driving voltage consecutively to first different data lines from each other, and
a second group of data driving circuits of the plurality of data driving circuits generate both a G1 driving voltage and a G2 driving voltage, which correspond to first green image data and second green image data, respectively, that are consecutively received during the one horizontal period, consecutively during the one horizontal period, and provide the G1 driving voltage and the G2 driving voltage consecutively to second different data lines from each other.

13. The display device of claim 12 , wherein the first group of data driving circuits consecutively output the R driving voltage and the B driving voltage to switch circuit during an odd horizontal period and sequentially output the B driving voltage and the R driving voltage to switch circuit during an even horizontal period successive to the odd horizontal period.

14. The display driver circuit of claim 12 , wherein the first group of data driving circuits consecutively output the R driving voltage and the B driving voltage to switch circuit during an odd horizontal period and consecutively output the R driving voltage and the B driving voltage to the switch circuit during an even horizontal period successive to the odd

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kong Ki-Ho
• Suh Dong-Wook
• Kim Hee-Jong
• Shin Chang-Hee
• Kwon Hyeok-Chul
• Yune Hong-Keun

Classifications

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2310/0297

  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 · CPC title

• G09G3/2003 Primary

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title