DISPLAY DEVICE, DRIVER CIRCUIT, AND DRIVING METHOD

• US 20170270866A1
• Filed: 10/27/2015
• Published: 09/21/2017
• Est. Priority Date: 12/22/2014
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asano, Mitsuru
• Granted Patent: US 10,621,917 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0871 with level shifting
• CPC Class Codes: G09G 2310/0213 controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/066 for control of contrast
• 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
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes

Abstract

A display device of the disclosure includes a plurality of pixels and a driver. The driver unit makes scanning of pixels that belong to a plurality of pixel lines out of the plurality of pixels, in units of pixel line groups each of which is constituted by a predetermined number of the pixel lines, in a scanning order indicated by scanning ordinal numbers associated with the respective pixel line groups, to perform a write drive that includes writing a pixel voltage to each pixel. The scanning ordinal numbers are set to allow a sum of the scanning ordinal numbers of any two adjacent pixel line groups to approximate to a predetermined value.

Claims

1. A display device, comprising:

a plurality of pixels; and

a driver unit that makes scanning of pixels that belong to a plurality of pixel lines out of the plurality of pixels, in units of pixel line groups each of which is constituted by a predetermined number of the pixel lines, in a scanning order indicated by scanning ordinal numbers associated with the respective pixel line groups, to perform a write drive that includes writing a pixel voltage to each pixel,

the scanning ordinal numbers being set to allow a sum of the scanning ordinal numbers of any two adjacent pixel line groups to approximate to a predetermined value.

2. The display device according to claim 1, wherein

the driver unit performs the write drive, after collectively performing a preparatory drive, with respect to the pixels that belong to the plurality of the pixel lines.

3. The display device according to claim 1, wherein

the driver unit makes the scanning in the scanning order, to perform the write drive and to perform a light emission drive that includes allowing each pixel to emit light on a basis of the pixel voltage.

4. The display device according to claim 1, wherein

the driver unit collectively performs a light emission drive, after the write drive, with respect to the pixels that belong to the plurality of the pixel lines, the light emission drive including allowing each pixel to emit light.

5. The display device according to claim 1, wherein

the driver unit

makes the scanning in the scanning order, to perform a preparatory drive and the write drive, and

subsequently, collectively performs the light emission drive, with respect to the pixels that belong to the plurality of the pixel lines, the light emission drive including allowing each pixel to emit light.

6. The display device according to claim 1, wherein

a sequence of the scanning ordinal numbers in the N pixel lines is a first sequence, a second sequence, a third sequence, or a fourth sequence of ordinal numbers NS, the first sequence of the ordinal numbers NS being given with utilization of Expression (1) below if N is an even number, or with utilization of Expression (2) below if N is an odd number, with i sequentially varied from 1 to N, the second sequence being in reverse to the first sequence, the third sequence being given with a predetermined number of the ordinal numbers from a head of the first sequence and remaining ordinal numbers changed over, and the fourth sequence being in reverse to the third sequence.

7. The display device according to claim 1, wherein

the plurality of the pixel lines includes an even number of the pixel lines.

8. The display device according to claim 1, wherein

the scanning order is a random scanning order.

9. The display device according to claim 1, wherein

the driver unit changes the scanning order for each frame.

10. The display device according to claim 9, wherein

the scanning order in any one frame is a scanning order in reverse to the scanning order in a frame preceding the relevant one frame.

11. The display device according to claim 1, wherein

the driver unit makes, in each frame, the scanning of the pixels that belong to the plurality of the pixel lines, in a same scanning order.

12. The display device according to claim 1, wherein

the predetermined number of the pixel lines includes a single pixel line.

13. The display device according to claim 1, wherein

the predetermined number of the pixel lines includes a plurality of the pixel lines.

14. The display device according to claim 1, wherein

each pixel includes:

a light emitting element;

a drive transistor that includes a gate and drives the light emitting element;

a capacitor coupled to the gate of the drive transistor; and

a write transistor that is turned on to set the pixel voltage to the capacitor, in the write drive.

15. The display device according to claim 1, wherein

the driver unit make sequential scanning of the plurality of the pixels on a plurality-of-pixel-line basis, while performing the write drive with respect to the pixels that belong to the plurality of the pixel lines.

16. A display device, comprising:

a plurality of pixels; and

a driver unit that makes scanning of pixels that belong to a plurality of pixel lines out of the plurality of pixels, in units of pixel line groups each of which is constituted by a predetermined number of the pixel lines, in a scanning order indicated by scanning ordinal numbers associated with the respective pixel line groups, to perform a write drive that includes writing a pixel voltage to each pixel,

the scanning ordinal numbers being set to allow a component at a high spatial frequency to become larger, in a sequence of the scanning ordinal numbers of the respective pixel line groups.

17. A drive circuit, comprising a driver unit that makes scanning of pixels that belong to a plurality of pixel lines, in units of pixel line groups each of which is constituted by a predetermined number of the pixel lines, in a scanning order indicated by scanning ordinal numbers associated with the respective pixel line groups, to perform a write drive that includes writing a pixel voltage to each pixel,

the scanning ordinal numbers being set to allow a sum of the scanning ordinal numbers of any two adjacent pixel line groups to approximate to a predetermined value.

18. A driving method, comprising:

setting scanning ordinal numbers of a plurality of respective pixel line groups, the plurality of pixel line groups being each constituted by a predetermined number of pixel lines, and the scanning ordinal numbers being set to allow a sum of the scanning ordinal numbers of any two adjacent pixel line groups to approximate to a predetermined value; and

making scanning of pixels that belong to a plurality of pixel lines, in units of the pixel line groups, in a scanning order indicated by the scanning ordinal numbers, to write a pixel voltage to each pixel,