Display driving circuit and display device including the same

Patent metadata

Field	Value
Publication number	US-12451084-B2
Application number	US-202418741906-A
Country	US
Kind code	B2
Filing date	Jun 13, 2024
Priority date	Jun 28, 2023
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A display driving circuit includes a control logic, a source amplifier, and first and second switching elements. The source amplifier includes a first input terminal, a second input terminal, and an output terminal, and amplifies a pixel voltage for displaying an image on a display panel and provides the amplified pixel voltage to a pixel through a data line. The first switching element is connected between the first input terminal and the output terminal, and the second switching element is connected between the first input terminal and the sensing line. The control logic controls the first switching element and the second switching element such that the source amplifier compares a sample voltage that is input to the first input terminal through a sensing line with a comparison voltage input to the second input terminal and outputs comparison data based on the comparison.

First claim

What is claimed is:

1. A display driving circuit for driving a display panel including a data line, a sensing line, and a pixel connected to the data line and the sensing line, the display driving circuit comprising:
a control logic controlling an operation of the display driving circuit;
a source amplifier comprising a first input terminal, a second input terminal, and an output terminal, the source amplifier amplifying a pixel voltage for displaying an image on the display panel and providing the amplified pixel voltage to the pixel through the data line;
a first switching element connected between the first input terminal and the output terminal; and
a second switching element connected between the first input terminal and the sensing line,
wherein the control logic performs a first control to control the first switching element and the second switching element such that the source amplifier amplifies the pixel voltage, and performs a second control to control the first switching element and the second switching element such that the source amplifier compares a sample voltage that is input to the first input terminal through the sensing line with a comparison voltage input to the second input terminal and outputs comparison data based on a comparison result of the sample voltage with the comparison voltage.

2. The display driving circuit of claim 1 , further comprising a third switching element connected between an initialization power supply and the sensing line,
wherein in the second control, the control logic, in a reset period, turns on the first switching element and the third switching element and turns off the second switching element to apply an initialization voltage from the initialization power supply to the pixel through the third switching element and the sensing line.

3. The display driving circuit of claim 2 , wherein in the second control the control logic, in the reset period applies a test voltage to the pixel through the data line.

4. The display driving circuit of claim 3 , wherein in the second control the control logic, in a program period after the reset period, turns off the third switching element such that the sample voltage is output through the sensing line.

5. The display driving circuit of claim 4 , wherein in the second control the control logic, in a comparison period after the program period, turns off the first switching element and turns on the second switching element such that the source amplifier compares the sample voltage input to the first input terminal of the source amplifier with the comparison voltage input to the second input terminal, and outputs the comparison data.

6. The display driving circuit of claim 5 , wherein the comparison period comprises a first comparison period and a second comparison period,
the control logic, in the first comparison period, applies a first comparison voltage to the second input terminal of the source amplifier, and, in the second comparison period, applies a second comparison voltage to the second input terminal that is higher than the first comparison voltage, and
the source amplifier, in the first comparison period, compares the sample voltage with the first comparison voltage and outputs first comparison data based on a comparison result of the sample voltage with the first comparison voltage, and,
in the second comparison period, compares the sample voltage with the second comparison voltage and outputs second comparison data based on a comparison result of the sample voltage with the second comparison voltage.

7. The display driving circuit of claim 6 , wherein the control logic, based on the first comparison data and the second comparison data, determines whether an error has occurred in the pixel.

8. The display driving circuit of claim 1 , further comprising a fourth switching element connected between the sensing line and the output terminal,
wherein in the second control, the control logic, in a reset period, turns on the first switching element and the fourth switching element to apply an initialization voltage from the output terminal of the source amplifier to the pixel through the fourth switching element.

9. The display driving circuit of claim 8 , wherein in the second control, the control logic, in the reset period, applies a test voltage to the pixel through the data line.

10. The display driving circuit of claim 9 , wherein in the second control, the control logic, in the reset period, applies a preliminary initialization voltage to the second input terminal of the source amplifier such that the initialization voltage is output from the output terminal of the source amplifier.

11. The display driving circuit of claim 9 , wherein in the second control, the control logic, in a program period after the reset period, turns off the fourth switching element such that the sample voltage of the pixel is output through the sensing line.

12. The display driving circuit of claim 1 , further comprising:
a compensation capacitor that stabilizes the source amplifier when the source amplifier amplifies the pixel voltage; and
a fifth switching element connected between the compensation capacitor and an initialization power supply,
wherein in the second control, the control logic, in an offset correction period, controls the first switching element and the fifth switching element such that an offset voltage of the source amplifier is stored in the compensation capacitor.

13. The display driving circuit of claim 12 , wherein the control logic, in the offset correction period, turns on the first switching element to form a feedback loop connecting the first input terminal of the source amplifier to the output terminal of the source amplifier and turns on the fifth switching element to store the offset voltage in the compensation capacitor.

14. The display driving circuit of claim 1 , wherein the pixel comprises an emission switching element connected to a driving power supply, and
in the second control, the control logic applies a driving voltage from the driving power supply to the pixel through the emission switching element and applies an initialization voltage to the pixel.

15. The display driving circuit of claim 1 , further comprising a level shifter that shifts a level of the comparison data.

16. A display driving circuit for driving a display panel including a plurality of data lines, a plurality of sensing lines, and a plurality of pixels connected to the plurality of data lines and the plurality of sensing lines, the display driving circuit comprising:
a plurality of decoders that correspond respectively to the plurality of data lines, each decoder converting pixel data of a corresponding data line and outputting a pixel voltage;
a plurality of source amplifiers that correspond respectively to the plurality of decoders, each source amplifier comprising a first input terminal, a second input terminal and an output terminal, and amplifying a corresponding pixel voltage and providing the amplified pixel voltage to a corresponding pixel through the corresponding data line;
a plurality of first switching elements that correspond respectively to the plurality of source amplifiers, each first switching element connected between the first input terminal and the output terminal of a corresponding source amplifier; and
a plurality of second switching elements that corresponding respectively to the plurality of source amplifiers, each second switching element connected between the first input terminal of the corresponding source amplifier and a corresponding sensing line,
wherein each of the plurality of

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Heejin
• Kim Minsung
• Kim Sunkwon
• Ryu Seongyoung
• Song Uijong
• Lee Yilho
• Jo Yunrae

Classifications

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2300/0838

  with level shifting · CPC title

• G09G2330/12

  Test circuits or failure detection circuits included in a display system, as permanent part thereof · CPC title

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G2310/061

  for resetting or blanking · CPC title