Display substrate and driving method thereof, and display device

• US 10,209,601 B2
• Filed: 09/23/2016
• Issued: 02/19/2019
• Est. Priority Date: 01/08/2016
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Hou, Qingna, Yang, Weifan, Feng, Lan
• Primary Examiner(s): Ben, Loha
• Application Number:
  US15/508,817
• Publication Number:
  US 20180113367A1
• Time in Patent Office: 879 Days
• Field of Search: 359245, 359265, 359267, 359270, 359275, 345 48, 345 49, 345 55, 345 84, 345 87, 345 88, 345 92, 345105, 345212, 345215, 345690, 345691
• CPC Class Codes: G02F 1/15 based on an electrochromic effect
• CPC Class Codes: G02F 1/163 Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
• CPC Class Codes: G02F 2001/1635 the pixel comprises active switching elements, e.g. TFT
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3433 using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices using liquid crystal devices G09G3/36; using electrochromic devices G09G3/38
• CPC Class Codes: G09G 3/38 using electrochromic devices

Abstract

Disclosed are a display substrate and a driving method thereof, and a display device. The display substrate includes a plurality of pixels, a data signal chip and a control unit. Each of the pixels includes a white sub-pixel; the data signal chip is for transmitting a set of data signals to the pixels, the set of data signals including data signals transmitted to the white sub-pixel; and the control unit controls the white sub-pixel to be in a dark state when the data signal chip transmits a predetermined set of data signals to the pixels. When the data signal chip transmits the predetermined set of data signals to the pixels, the display substrate controls the white sub-pixel to be in a dark state.

Claims

1. A display substrate comprising:

a plurality of pixels, wherein each of the pixels comprises a white sub-pixel;

a data signal chip configured to transmit a set of data signals to the pixels, the set of data signals comprising a data signal transmitted to the white sub-pixel; and

a control unit which controls the white sub-pixel to be in a dark state upon the data signal chip transmitting a predetermined set of data signals to the pixels.

2. The display substrate according to claim 1, wherein each of the pixels further comprises a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the set of data signals further comprises data signals transmitted to the red sub-pixel, the green sub-pixel, and the blue sub-pixel.

3. The display substrate according to claim 2, wherein, upon the pixels receiving the predetermined set of data signals, the red sub-pixel, the green sub-pixel, and the blue sub-pixel emit mixed color light, and the white sub-pixel emits white light which causes the brightness of the mixed color light seen by a human eye to be less than an actual brightness of the mixed color light by a preset percentage.

4. The display substrate according to claim 3, wherein the preset percentage includes 5%.

5. The display substrate according to claim 2, wherein the red sub-pixel, the green sub-pixel, and the blue sub-pixel emit mixed color light including light green light, yellow light or light blue light upon the pixels receiving the predetermined set of data signals.

6. The display substrate according to claim 1, wherein the control unit comprises:

an electrochromic cell disposed corresponding to the white sub-pixel; and

a control chip for acquiring the set of data signals transmitted to the pixels by the data signal chip, and controlling the electrochromic cell to be in an opaque state if the set of data signals is the predetermined set of data signals.

7. The display substrate according to claim 6, wherein the electrochromic cell has a same shape and a same size as the white sub-pixel.

8. The display substrate according to claim 6, wherein the control unit controls the electrochromic cell to be in a transparent state if the acquired set of data signals transmitted to the pixels by the data signal chip is not the predetermined set of data signals after the electrochromic cell has been maintained to be in the opaque state for a predetermined period of time.

9. The display substrate according to claim 6, wherein the electrochromic cell comprises:

a first electrode layer;

an ion storage layer disposed on the first electrode layer;

an electrolyte layer disposed on the ion storage layer;

an electrochromic layer disposed on the electrolyte layer; and

a second electrode layer disposed on the electrochromic layer.

10. The display substrate according to claim 9, wherein,

upon the set of data signals transmitted to the pixels by the data signal chip being the predetermined set of data signals, the control unit applies a forward current to the first electrode layer and the second electrode layer so that the electrochromic layer is in an opaque state, and

upon the acquired set of data signals transmitted to the pixels by the data signal chip being not the predetermined set of data signals after the electrochromic layer has been maintained to be in the opaque state for a predetermined period of time, the control unit applies a reverse current to the first electrode layer and the second electrode layer so that the electrochromic layer is in a transparent state.

11. The display substrate according to claim 9, wherein the white sub-pixel comprises:

a pixel electrode and a common electrode,

wherein the ion storage layer is disposed on the pixel electrode, the electrolyte layer is disposed on the ion storage layer, the electrochromic layer is disposed on the electrolyte layer, and the common electrode is disposed on the electrolyte layer.

12. The display substrate according to claim 11, wherein the pixel electrode is also used as the first electrode layer, and the common electrode is also used as the second electrode layer.

13. The display substrate according to claim 6, wherein the control chip is integrated in the data signal chip.

14. The display substrate according to claim 1, wherein the control unit comprises:

a switch unit provided on a data line between the data signal chip and the white sub-pixel; and

a control chip configured for detecting the set of data signals transmitted to the pixels by the data signal chip, and controlling the switch unit to be turned off if the set of data signals is the predetermined set of data signals.

15. The display substrate according to claim 14, wherein the control unit controls the switch unit to be turned on if the set of data signals transmitted to the pixels by the data signal chip is not the predetermined set of data signals after the control unit has controlled the switch unit to be turned off for a predetermined period of time.

16. The display substrate according to claim 14, wherein the switch unit comprises:

a thin film transistor comprising a gate electrode, a source electrode and a drain electrode,

wherein the gate electrode is connected to the control chip, and the source electrode and the drain electrode are respectively connected to the white sub-pixel and the data signal chip.

17. A display device, comprising the display substrate according to claim 1.

18. A driving method of a display substrate, wherein the display substrate comprises:

a plurality of pixels, each of the pixels comprising a white sub-pixel;

a data signal chip for transmitting a set of data signals to the pixels; and

a control unit,

the driving method comprising controlling the white sub-pixel to be in a dark state by the control unit upon the data signal chip transmitting a predetermined set of data signals to the pixels.

19. The driving method according to claim 18, wherein, upon the pixels receiving the predetermined set of data signals, the pixels emit mixed color light, and the white sub-pixel emits white light which causes a brightness of the mixed color light seen by a human eye to be less than an actual brightness of the mixed color light by a preset percentage.

20. The driving method according to claim 19, wherein the preset percentage includes 5%.