Display device and method for driving the display device

Patent metadata

Field	Value
Publication number	US-9858862-B2
Application number	US-201514924348-A
Country	US
Kind code	B2
Filing date	Oct 27, 2015
Priority date	Dec 24, 2014
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A display device and a method of driving the display device are discussed. The display device includes a display panel which has subpixels disposed at points where data lines intersect gate lines. A data driver supplies a data voltage corresponding to specific input data to the data lines. An analog-to-digital converter (ADC) senses the data voltage supplied to at least one data line of the data lines, and converts the sensed data voltage to digital sensed data. A timing controller supplies compensation data compensated based on the digital sensed data to the data driver, thereby compensating for a deviation of the data driver.

First claim

What is claimed is:

1. A display device comprising:
a display panel on which subpixels are disposed;
a data driver including at least two data driving integrated circuits (ICs) adapted to supply a data voltage corresponding to a test pattern data to at least one data line connected to the at least two data driving ICs;
at least one analog-to-digital converter sensing at least one data voltage supplied to at least one data line, and converting the sensed data voltages to digital sensed data; and
a controller adapted to supply compensation data generated based on the digital sensed data to the data driver connected to at least one data line of the data lines,
wherein the controller includes a deviation compensation circuit compensating for a deviation of the data driver based on the digital sensed data,
wherein the display panel comprises at least one of sensing line for one or more subpixels, the sensing line being connected to the one or more subpixels, the one or more analog-to-digital converters concerting sensed voltages measured through one or more sensing channels corresponding to the sensing lines to the digital sensed data, and
wherein the controller is adapted to acquire average sensed data according to the data driver ICs by averaging a plurality of sensed data obtained from the one or more analog-to-digital converters, each of which is include in a corresponding data driver IC of the two or more data driver ICs, to perform an analog-to-digital converter compensation by updating a lookup table based on a difference between the average sensed data according to the data driver ICs for a same voltage and reference data according to the data driver ICs.

2. The display device as claimed in claim 1 ,
wherein the least one analog-to-digital converter is adapted to sense at least one data voltage of each of the at least two data driving ICs, and convert the sensed data voltages to digital sensed data.

3. The display device as claimed in claim 2 , wherein the same test pattern data is supplied to data lines connected to the at least two data driving ICs.

4. The display device according to the claim 3 , wherein at least one output terminal of each of the at least two data driver ICs is connected to the analog-to-digital converter of the data driver ICs.

5. The display device as claimed in claim 2 , wherein the analog-to-digital converter is included in one of the at least two data driving ICs or in the controller or each data driver IC includes one analog-to-digital converter.

6. The display device as claimed in claim 1 , wherein the test pattern data is supplied to one data line of first data driving ICs and to one data line of second data driving ICs,
wherein the two data lines are adjacent to each other and the first and second data driving ICs are adjacent to each other, and
wherein the least one analog-to-digital converter is adapted to sense the data voltages supplied to the adjacent data lines of the two adjacent data driving ICs.

7. The display device as claimed in claim 1 , wherein each data driving IC includes a plurality of digital-analog converters, corresponding to the number of data lines connected to a respective data driving IC.

8. The display device according to claim 7 , wherein the analog-to-digital converter is adapted to sense the data voltage supplied to at least one data line of the data lines connected to one digital-to-analog converter of the two or more digital-to-analog converters and/or is adapted to convert the sensed voltages into sensed data.

9. The display device according to the claim 1 , wherein at least one outermost output of each of the data driver ICs is connected to the one analog-to-digital converter or the two outermost outputs of data driver ICs are connected to the analog-to-digital converter included in the data driver IC, respectively.

10. The display device as claimed in the claim 1 , further comprising a memory,
wherein the controller is adapted to store a difference value indicating at least one of the sensed data, and a difference between a reference value based on the test pattern data and the sensed data in the memory, and
wherein the compensation data is calculated based on the difference value.

11. The display device according to claim 10 , wherein the controller is adapted to store output errors according to the data driver ICs in the memory, the output errors being differences between the reference data based on the test pattern data and the sensed data, and to supply compensation data produced by compensating for the sensed data with the output errors stored according to the data driver ICs to each of the data driver ICs.

12. The display device according to claim 10 , wherein the controller is adapted to store output errors for the data driver ICs in the memory, the output errors being differences between the sensed data of the data driver ICs and an average of the sensed data, and to supply compensation data produced by compensating for the sensed data with the output errors stored according to the data driver ICs to the data driver integrated circuits.

13. The display device according to claim 1 , wherein the controller is adapted to subsequently compensate for a threshold voltage of a transistor within each of the subpixels by referring to the updated lookup table after the analog-to-digital converter compensation.

14. The display device according to claim 1 , wherein the controller is adapted to compensate for a deviation in the data driver after the analog-to-digital converter compensation and/or during normal driving.

15. The display device according to claim 1 , wherein the test data pattern corresponds to a monochrome pattern.

16. A method for driving a display device including a display panel having a plurality of subpixels, at least one of sensing line being connected to the one or more subpixels and a data driver including at least two data driving integrated circuits (ICs) and an analog-to-digital converter and a controller, the method comprising:
supplying a data voltage corresponding to test pattern data to data lines connected to the at least two data driving ICs;
sensing a data voltage supplied to at least one data line of the data lines through one or more sensing channels corresponding to the sensing lines;
converting the sensed data voltage to digital sensed data; and
supplying compensation data compensated based on the digital sensed data to at least one data line of the data lines,
wherein, the supplying the compensation data includes:
acquiring average sensed data according to the data driver ICs by averaging a plurality of sensed data obtained from the one or more analog-to-digital converters, each of which is included in a corresponding data driver IC of the two or more data driver ICs; and
performing an analog-to-digital converter compensation by updating a lookup table based on a difference between the average sensed data according to the data driver ICs for a same voltage and reference data according to the data driver ICs.

Assignees

• Lg Display Co Ltd

Inventors

• Kwon Ohjong
• Park Sungwoo

Classifications

• G09G2310/0291

  Details of output amplifiers or buffers arranged for use in a driving circuit · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2330/12

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