Bendable display panel and display device

Patent metadata

Field	Value
Publication number	US-10380938-B2
Application number	US-201815866230-A
Country	US
Kind code	B2
Filing date	Jan 9, 2018
Priority date	Sep 4, 2017
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

Embodiments of the present disclosure provide a display panel and a display device to improve brightness difference between bending position and non-bending position of the display panel. The display panel includes an array substrate including a display area, the display area includes a non-bendable first display area in which a first driving transistor is arranged; a bendable second display area in which a second driving transistor is arranged, a width-length ratio of the first driving transistor being greater than that of the second driving transistor; a first organic light emitting diode arranged in the first display area and including an anode and a cathode, the anode being coupled to the first driving transistor; and a second organic light emitting diode arranged in the second display area and including an anode and a cathode, the anode of the second organic light emitting diode being coupled to the second driving transistor.

First claim

What is claimed is:

1. A display panel, comprising:
an array substrate having a display area and a non-display area surrounding the display area, wherein the display area comprises:
a first display area being non-bendable;
a second display area being bendable;
a plurality of first pixel diving circuits, each including a plurality of first driving transistors, arranged in the first display area; and
a plurality of second pixel diving circuits, each including a plurality of second driving transistors, arranged in the second display area;
wherein a first width-length ratio of each of the plurality of first driving transistors is greater than a second width-length ratio of each of the plurality of second driving transistors;
wherein a plurality of first organic light emitting diodes each corresponding to a respective first pixel driving circuit of the plurality of first pixel driving circuits is arranged in the first display area, wherein each of the plurality of first organic light emitting diodes comprises an anode and a cathode, wherein the anode is coupled to the plurality of first driving transistors in a respective first pixel driving circuit;
wherein a plurality of second organic light emitting diodes each corresponding to a respective second pixel driving circuit of the plurality of second pixel driving circuits is arranged in the second display area, wherein each of the plurality of second organic light emitting diodes comprises an anode and a cathode, wherein the anode of the second organic light emitting diode is coupled to the plurality of second driving transistors in a respective second pixel driving circuit;
wherein a difference between the first width-length ratio and the second width-length ratio is j, and a ratio of j to the first width-length ratio is k, and wherein k is smaller than 70%.

2. The display panel according to claim 1 ,
wherein a number of the transistors of the plurality of first driving transistors in one of the first pixel driving circuits is the same as a number of the transistors of the plurality of second driving transistors in one of the second pixel driving circuits.

3. The display panel according to claim 1 ,
wherein the first display area comprises a plurality of first pixel driving circuits, wherein each of the plurality of first pixel driving circuits includes one of the plurality of first driving transistors;
wherein the second display area comprises a plurality of second pixel driving circuits, wherein each of the plurality of second pixel driving circuits includes one of the plurality of second driving transistors; and
wherein a number of transistors of the plurality of first driving transistors in one of the first pixel driving circuits is different from a number of transistors of the plurality of second driving transistors in one of the second pixel driving circuits.

4. The display panel according to claim 3 ,
wherein the number of transistors of the plurality of first driving transistors in one of the first driving circuits is greater than the number of transistors of the plurality of second driving transistors in one of the second driving circuits.

5. The display panel according to claim 4 ,
wherein each of the plurality of first pixel driving circuits comprises six transistors of the plurality of second driving transistors and one capacitor; and
wherein each of the plurality of second pixel driving circuits comprises five transistors of the plurality of second driving transistors and one capacitor.

6. The display panel according to claim 4 ,
wherein each of the plurality of first pixel driving circuits comprises of six transistors of the plurality of first driving transistors and one capacitor; and
wherein each of the plurality of second pixel driving circuits comprises of two transistors of the plurality of second driving transistors and one capacitor.

7. The display panel according to claim 4 , further comprising:
a first pixel driving chip electrically connected to the plurality of first pixel driving circuits and the plurality of second pixel driving circuits.

8. The display panel according to claim 4 , further comprising:
a first pixel driving chip electrically connected to the plurality of first pixel driving circuits; and
a second pixel driving chip electrically connected to the plurality of second pixel driving circuits.

9. The display panel according to claim 1 , wherein
the display panel is a flexible display panel.

10. The display panel according to claim 9 , wherein
when the second display area is bent, the first display area and the second display area are not aligned in a same plane.

11. The display panel according to claim 1 , wherein
the display panel comprises a plurality of the first display areas and a plurality of the second display areas.

12. The display panel according to claim 1 , wherein
the first display area and the second display area each is stripe-shaped.

13. The display panel according to claim 12 , wherein
the first display area comprises a plurality of first display sub-areas, and the second display area comprises a plurality of second display sub-areas; and
wherein the plurality of first display sub-areas and the plurality of second display sub-areas are alternately arranged.

14. The display panel according to claim 1 , wherein the array substrate further comprises:
a third display area, wherein a third driving transistor is arranged in the third display area, wherein the second width-length ratio of the second driving transistor is greater than a width-length ratio of the third driving transistor.

15. A display device, comprising: a display panel, wherein the display panel comprises:
an array substrate having a display area and a non-display area surrounding the display area, wherein the display area comprises:
a first display area being non-bendable;
a second display area being bendable;
a plurality of first pixel diving circuits, each including a plurality of first driving transistors, arranged in the first display area; and
a plurality of second pixel diving circuits, each including a plurality of second driving transistors, arranged in the second display area;
wherein a first width-length ratio of each of the plurality of first driving transistors is greater than a second width-length ratio of each of the plurality of second driving transistors;
wherein a plurality of first organic light emitting diodes each corresponding to a respective first pixel driving circuit of the plurality of first pixel driving circuits is arranged in the first display area, wherein each of the plurality of first organic light emitting diodes comprises an anode and a cathode, wherein the anode is coupled to the plurality of first driving transistors in a respective first pixel driving circuit;
wherein a plurality of second organic light emitting diodes each corresponding to a respective second pixel driving circuit of the plurality of second pixel driving circuits is arranged in the second display area, wherein each of the plurality of second organic light emitting diodes comprises an anode and a cathode, wherein the anode of the second organic light emitting diode is coupled to the plurality of second driving transistors in a respective second pixel driving circuit;
wherein a difference between the first width-length ratio and the second width-length ratio is j, and a ratio of j to the first width-length ratio is k, and wherein k is smaller than 70%.

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Su Congyi

Classifications

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title