DISPLAY DEVICE AND DRIVING METHOD THEREOF

• US 20200135113A1
• Filed: 08/15/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: BAIK, JOON SUK, RYU, JAE WOO, LEE, MYUNG HO, HAN, SANG SU
• Granted Patent: US 10,984,718 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0218 with collection of electrodes in groups for n-dimensional addressing
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 3/2007 Display of intermediate tones
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element

Abstract

A display device may include pixels coupled to scan lines and data lines, at least one scan driver for supplying a scan signal to the pixels through the scan lines, and a data driver for supplying a data signal and a bias signal to the pixels through the data lines. The pixels are supplied with the data signal when the scan signal is supplied during display periods, and are supplied with the bias signal when the scan signal is supplied during a bias period between the display periods. By the bias signal, a bias voltage is supplied to first group pixels that emit light with a preset grayscale during the display periods.

Claims

1. A display device comprising:

pixels coupled to scan lines and data lines;

at least one scan driver configured to supply a scan signal to the pixels through the scan lines; and

a data driver configured to supply a data signal and a bias signal to the pixels through the data lines,

wherein the pixels are supplied with the data signal when the scan signal is supplied during display periods, and are supplied with the bias signal when the scan signal is supplied during a bias period between the display periods, and

wherein, by the bias signal, a bias voltage is supplied to first group pixels that emit light with a preset grayscale during the display periods.

2. The display device of claim 1, wherein, by the bias signal, a predetermined voltage is supplied to second group pixels that do not emit light with the preset grayscale during the display periods.

3. The display device of claim 2, wherein the predetermined voltage is a voltage lower than the bias voltage.

4. The display device of claim 2, wherein the predetermined voltage is substantially the same voltage as that supplied by the data signal.

5. The display device of claim 2, wherein the predetermined voltage is the bias voltage.

6. The display device of claim 1, wherein the bias signal is supplied with respect to at least one pixel row selected during the display periods through the data lines when the scan signal is supplied during the bias period.

7. The display device of claim 1, further comprising a timing controller configured to supply image data to the data driver during the display periods and supply bias data to the data driver during the bias period.

8. The display device of claim 7, wherein the timing controller selects at least one pixel row to which the bias signal is to be supplied during the bias period.

9. The display device of claim 8, wherein the timing controller generates and stores the bias data, based on the image data supplied to the selected at least one pixel row.

10. The display device of claim 9, wherein the bias data is configured such that the bias voltage is supplied to the first group pixels during the bias period.

11. The display device of claim 8, wherein the timing controller supplies a start signal to each of the at least one scan driver.

12. The display device of claim 11, wherein, at a start time of the bias period, the timing controller supplies the start signal to a scan driver coupled to the selected at least one pixel row.

13. The display device of claim 12, wherein, at a start time of a reset period after the bias period, the timing controller supplies the start signal to the scan driver coupled to the selected at least one pixel row, and re-supplies the image data supplied during the display periods to the data driver.

14. A display device comprising:

pixels coupled to scan lines and data lines;

at least one scan driver configured to supply a scan signal to the pixels through the scan lines; and

a data driver configured to supply a data signal and a bias signal to the pixels through the data lines,

wherein the pixels are supplied with the data signal when the scan signal is supplied during display periods, and are supplied with the bias signal when the scan signal is supplied during a bias period between the display periods, and

wherein the bias signal is supplied with respect to at least one selected pixel row during the display periods.

15. The display device of claim 14, further comprising a timing controller configured to supply a start signal to each of the at least one scan driver.

16. The display device of claim 15, wherein, at a start time of the bias period, the timing controller supplies the start signal to a scan driver coupled to the at least one selected pixel row.

17. The display device of claim 16, wherein, by the bias signal, a bias voltage is supplied to first group pixels that emit light with a preset grayscale during the display periods on the at least one selected pixel row.

18. The display device of claim 17, wherein, by the bias signal, any one of a voltage lower than the bias voltage, the same voltage as that supplied by the data signal, and the bias voltage is supplied to second group pixels that do not emit light with the preset grayscale during the display periods.

19. The display device of claim 17, wherein, at a start time of a reset period after the bias period, the timing controller supplies the start signal to the scan driver coupled to the at least one selected pixel row, and re-supplies image data supplied during the display periods to the data driver.

20. A display device comprising:

pixels coupled to scan lines and data lines;

first through nth scan drivers configured to supply scan signals to the pixels through the scan lines;

a data driver configured to supply data signals and a bias signal to the pixels through the data lines; and

a timing controller configured to supply image data and bias data to the data driver, and to sequentially supply first through nth start signals to the first through nth scan drivers, respectively,

wherein the pixels are supplied with the data signals when the scan signals are supplied during display periods, and are supplied with the bias signal when the scan signals are supplied during a bias period between the display periods, and

wherein n is a natural number greater than one.