Pixel structure for OLED display panel

Patent metadata

Field	Value
Publication number	US-9922595-B2
Application number	US-201515308684-A
Country	US
Kind code	B2
Filing date	May 5, 2015
Priority date	May 5, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A pixel structure for use in a high-definition light-emitting display panel having a plurality of sub-pixels, comprising: a glass substrate; a backplane that is disposed on the glass substrate and includes a capacitive element having sufficiently high light transmittance to cause 50 percent or more of light to be transmitted therethrough; a frontplane that is disposed on the backplane and includes a light-emitting element disposed so as to radiate light towards the glass substrate and the backplane; an electrical connecting portion that provides an electrical connection between the frontplane and the backplane, three or fewer of such electrical connecting portions being provided on one of the sub-pixels; and a switching element that is provided on the backplane and controls electricity distribution to the light-emitting element, wherein an aperture ratio from which light is transmitted through the glass substrate is 20 percent or more.

First claim

The invention claimed is:

1. A pixel structure for use in a high-definition light-emitting display panel having a plurality of sub-pixels, comprising:
a glass substrate;
a backplane that is disposed on the glass substrate and includes at least one capacitor having sufficiently high light transmittance to cause 50 percent or more of light to be transmitted therethrough;
a frontplane that is disposed on the backplane, the frontplane including a light-emitting element disposed so as to radiate light towards the glass substrate and the backplane when current flows through the light-emitting element;
an electrical connecting portion that provides an electrical connection between the frontplane and the backplane, three or fewer of such electrical connecting portions being provided on one of the sub-pixels; and
a switching element that is provided on the backplane and can be selectively activated to control electricity distribution to the light-emitting element, the at least one capacitor being connected to the switching element so as to maintain current flow through the light-emitting element when the switching element becomes deactivated,
wherein an aperture ratio from which light is transmitted through the glass substrate is 20 percent or more, and
wherein at least one of the electrical connecting portions that provide an electrical connection between the frontplane and the backplane is disposed so as to connect one electrode of the switching element included in the backplane and a hole-injecting side electrode of the light-emitting element included in the frontplane.

2. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein
the capacitive element has a conductive layer;
the backplane includes at least one wire; and
the conductive layer is substantially polygonal and its side is in electrical contact with or integral with at least one of the wires.

3. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein
the capacitive element has an insulating layer;
at least one wire including the internal wire inside the backplane is located in a layer above the insulating layer of the capacitive element that causes light to be transmitted therethrough.

4. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein
the capacitive element has the conductive layer; and
at least one wire including the internal wire inside the backplane is integral with the conductive layer of the capacitive element.

5. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein the switch is a thin film transistor having an active layer of a silicon, metallic oxide, or organic matter.

6. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein the total number of photo masks and metal masks for use in a manufacturing process is 15 or fewer.

7. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein two of the electrical connecting portions that provide an electrical connection between the frontplane and the backplane are provided for one of the sub-pixels.

8. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein one of the electrical connecting portions that provide an electrical connection between the frontplane and the backplane is provided for one of the sub-pixels.

9. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein the capacitive element causes 50 percent or more of light to be transmitted therethrough in a visible light region.

10. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein 50 percent or more of an area occupied by the capacitive element is disposed so as to be overlapped with the light-emitting element, when viewed from one side of the glass substrate.

11. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein an insulating planarization layer is disposed on the backplane.

12. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein an electron injecting side electrode of the light-emitting element included in the frontplane is provided with a wire and does not include in one of the sub-pixels the electrical connecting portion that provides an electrical connection between the frontplane and the backplane.

13. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein the frontplane and the backplane respectively include at least one earth line.

14. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein one of the sub-pixels includes at least two switching elements, at least one capacitive element, and at least one light-emitting element.

15. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein one of the sub-pixels includes a wire for measurement of the voltage of one electrode of the light-emitting element.

16. The pixel structure for use in the high-definition light-emitting display panel according to claim 1 , wherein one of the sub-pixels includes a wire for adjustment of the voltage of one electrode of the capacitive element.

17. An organic electroluminescence display unit, including a high-definition light-emitting display panel having a pixel structure according claim 1 .

18. The pixel structure for use in the high-definition light-emitting display panel according to claim 5 , wherein
the backplane includes a linear wiring pattern extending in the pixel;
the switch is the thin film transistor; and
an end of the linear wiring pattern is applied as source and drain electrode terminals of the thin film transistor.

19. The pixel structure for use in the high-definition light-emitting display panel according to claim 5 , wherein four or fewer of the thin film transistors are provided for one of the sub-pixels.

20. A pixel structure for use in a high-definition light-emitting display panel having a plurality of sub-pixels, comprising:
a glass substrate;
a backplane that is disposed on the glass substrate and includes at least one capacitor having sufficiently high light transmittance to cause 50 percent or more of light to be transmitted therethrough;
a frontplane that is disposed on the backplane, the frontplane including a light-emitting element disposed so as to radiate light towards the glass substrate and the backplane when current flows through the light-emitting element;
an electrical connecting portion that provides an electrical connection between the frontplane and the backplane, three or fewer of such electrical connecting portions being provided on one of the sub-pixels; and
a switching element that is provided on the backplane and can be selectively activated to control electricity distribution to the light-emitting element, the at least one capacitor being connected to the switching element so as to maintain current flow through the light-emitting element when the switching element becomes deactivated,
wherein an aperture ratio from which light is transmitted through the glass substrate is 20 percent or more, and
wherein the light emitt

Assignees

• Commw Scient Ind Res Org

Inventors

• Hirai Tadahiko
• Ueno Kazunori

Classifications

• H01L27/326

  Electricity · mapped topic

• H01L27/3276

  Electricity · mapped topic

• 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

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2330/10

  Dealing with defective pixels · CPC title