Display substrate and manufacturing method thereof, display panel and mask

Patent metadata

Field	Value
Publication number	US-9831461-B2
Application number	US-201515038093-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Dec 30, 2014
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

The present invention provides a display substrate, which includes an anode layer, a cathode layer and a luminous layer that is provided between the anode layer and the cathode layer, the anode layer including a plurality of anodes and the luminous layer including a plurality of luminous regions, wherein the display substrate further includes at least one assisting electrode, the assisting electrode being insulated and spaced from the anode, and the assisting electrode contacting with the cathode layer in parallel, such that a total resistance of the assisting electrode and the cathode layer connected in parallel is smaller than a resistance of the cathode layer alone. The IR drop in the cathode of the display substrate provided by the present invention is relatively small, such that loss of electric signals is relatively small in the cathode layer and the assisting electrode, thereby obtaining a relatively higher image quality.

First claim

What is claimed is:

1. A display substrate, which includes an anode layer, a cathode layer and a luminous layer that is provided between the anode layer and the cathode layer, the anode layer including a plurality of anodes and the luminous layer including a plurality of luminous regions, wherein the display substrate further includes at least one assisting electrode, the at least one assisting electrode being insulated and spaced from the anodes, and the at least one assisting electrode contacting the cathode layer in parallel, such that a total resistance of the at least one assisting electrode and the cathode layer connected in parallel is smaller than a resistance of the cathode layer alone,
wherein the at least one assisting electrode and the anode layer are provided in a same layer, and
the display substrate further includes a spacer, insulation gaps are respectively formed at two sides of the at least one assisting electrode, a portion of the spacer being provided within the corresponding insulation gap and another portion of the spacer protruding from the anode layer, so as to space and insulate the at least one assisting electrode and the plurality of anodes,
wherein there are a plurality of pairs of spacers, and the plurality of pairs of spacers divide the display substrate into a plurality of anode regions and a plurality of assisting electrode regions, each of the anode regions being provided therein with at least one anode and luminous region, each of the assisting electrode regions being provided therein with at least one of the assisting electrodes, the assisting electrode region being provided around the anode regions, a width of the assisting electrode regions being smaller than a width of the anode regions, a portion of the cathode layer being located within gap between a pair of the spacers in the assisting electrode regions so as to electrically connect the cathode layer and the assisting electrodes, and
wherein shapes of the luminous regions formed in two anode regions at two sides of the assisting electrode are different.

2. The display substrate according to claim 1 , wherein the spacer includes a row spacer extending horizontally along the display substrate and a column spacer extending longitudinally along the display substrate.

3. A display panel, which includes the array substrate according to claim 1 .

4. A display substrate, which includes an anode layer, a cathode layer and a luminous layer that is provided between the anode layer and the cathode layer, the anode layer including a plurality of anodes and the luminous layer including a plurality of luminous regions, wherein the display substrate further includes at least one assisting electrode, the at least one assisting electrode being insulated and spaced from the anodes, and the at least one assisting electrode contacting the cathode layer in parallel, such that a total resistance of the at least one assisting electrode and the cathode layer connected in parallel is smaller than a resistance of the cathode layer alone,
wherein the at least one assisting electrode and the anode layer are provided in a same layer, and
the display substrate further includes spacers that divide the display substrate into a plurality of pixel units, a portion of the spacers penetrating through the anode layer and another portion of the spacers being located above the anode layer, and
wherein each of the assisting electrodes corresponds to one spacer, the assisting electrodes being connected in a mesh shape, insulation gaps being respectively formed at two sides of each of the assisting electrodes, each spacer including insertion parts being respectively provided within the insulation gaps at two sides of the corresponding assisting electrode and a connection part for connecting two insertion parts, the connection part of at least one spacer being provided with a via for exposing the assisting electrode, the cathode layer being connected with the assisting electrodes in parallel through the via.

5. The display substrate according to claim 4 , wherein the spacers define a plurality of regions and shapes of two adjacent regions are different, the luminous region being formed within the region.

6. A display panel, which includes the array substrate according to claim 1 .

7. A manufacturing method of a display substrate, which includes the following step of:
forming a luminous element array, and the step of forming the luminous element array including steps of:
forming an anode layer and at least one assisting electrode, the anode layer including a plurality of anodes, the at least one assisting electrode being insulated and spaced from the anodes;
forming a luminous layer, the luminous layer including a plurality of luminous regions; and
forming a cathode layer, the cathode layer contacting the at least one assisting electrode in parallel, such that a total resistance of the at least one assisting electrode and the cathode layer connected in parallel is smaller than a resistance of the cathode layer alone,
wherein the step of forming the anode layer and the at least one assisting electrode includes providing the anode layer and the at least one assisting electrode in a same layer,
wherein the step of forming the anode layer and the at least one assisting electrode includes steps of:
forming an anode material layer; and
forming a plurality of anode regions and a plurality of assisting electrode regions from the anode material layer, an insulation gap being formed between the at least one assisting electrode region and the anode region adjacent to the at least one assisting electrode region, at least one anode being included within each anode region, and the plurality of assisting electrodes being connected in a mesh shape;
between the step of forming the anode layer and the at least one assisting electrode and the step of forming the luminous layer, the manufacturing method further includes a step of:
forming a spacer within each insulation gap, a portion of the spacer being provided within the insulation gap and another portion of the spacer protruding from the anode layer; and
the step of forming the cathode layer includes depositing a material for forming the cathode layer within a gap between a pair of spacers, which have the at least one assisting electrode formed therebetween, such that the cathode layer connects with the at least one assisting electrode in parallel,
wherein the step of forming the luminous layer includes steps of:
disposing a mask above a base substrate formed thereon with the anode layer, wherein the mask includes a plurality of opening parts corresponding to the plurality of anode regions and a shielding part corresponding to the at least one assisting electrode; and
evaporating a material used for forming the luminous layer, so as to form the plurality of luminous regions above the plurality of anode regions by deposition,
wherein shapes of two anode regions at two sides of the assisting electrode are different, so that the luminous regions deposited within the two anode regions are different.

8. The manufacturing method according to claim 7 , wherein the plurality of anode regions are arranged in rows and columns.

9. A mask, which is used in the manufacturing method according to claim 7 , wherein the mask includes a plurality of opening parts and a shielding part corresponding to the at least one assisting electrode, the shielding part being used for spacing the adjacent opening parts.

10. A manufacturing method of a display substrate, which includes the following step of:
forming a luminous element array, and the step of forming the luminous element array including steps of:
forming an anode layer and at least one assi

Assignees

• Boe Technology Group Co Ltd

Inventors

• Song Young Suk
• Yoo Seong Yeol
• Choi Seung Jin
• Kim Hee Cheol

Classifications

• C23C14/04

  Coating on selected surface areas, e.g. using masks · CPC title

• H01L51/5228

  Electricity · mapped topic

• H01L51/5212 Primary

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H01L27/32

  Electricity · mapped topic