Display Substrate Grooves and Hollow Anodes for HPMJ Cleaning
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Solution Overview
Problem
The high pressure micro jet (HPMJ) technology used in manufacturing active matrix organic light emitting diode (AMOLED) panels frequently causes defective dark spots due to anode deformation and short circuits, resulting in a high reject ratio and slowed mass production.
Innovation Solution
A display substrate design featuring grooves and bosses in the flat layer, where anodes are formed on the bosses with hollow structures opposite to the grooves, allowing the grooves to accommodate anode deficiencies and relieve stress during high-pressure washing, preventing deformation and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high pressure micro jet (HPMJ) technology is used to clean particles on the glass substrate, then cleaning effectiveness is improved, but anode deformation and short circuits occur causing dark spots
Solution Approach 1:
The patent introduces a groove structure in the flat layer and a hollow structure in the anode before the HPMJ cleaning process. These pre-designed features act as cushioning elements that absorb and distribute the high pressure stress during cleaning, preventing the anode from deforming or causing short circuits while still allowing effective particle removal.
Solution Approach 2:
The patent applies local quality by creating specific groove patterns in the flat layer and hollow structures in the anode at strategic locations. These localized features concentrate the stress management capability where it is most needed during HPMJ cleaning, allowing the anode to withstand high pressure without deformation while maintaining overall structural integrity.
2Productivity
If HPMJ technology is used for cleaning, then particle removal is improved, but reject ratio increases due to dark spots
Solution Approach 1:
The groove and hollow structure designs are implemented before the HPMJ cleaning process to prevent anode deformation. This beforehand cushioning ensures that the high pressure cleaning can proceed effectively without causing the dark spot defects that would otherwise increase the reject ratio.
3Ease of manufacture
If HPMJ technology is used for cleaning, then cleaning capability is improved, but mass production speed slows down
Solution Approach 1:
By pre-designing the groove and hollow structures, the patent enables the use of HPMJ technology without the fear of causing anode deformation and dark spots. This eliminates the need for rework or rejection of defective panels, thereby maintaining high mass production speed while preserving excellent cleaning capability.
Data Source
AI summary
The application relates to the technical field of display, and discloses a display substrate, a method for preparing the same, and a display panel. The display substrate includes a base substrate, a pixel circuit layer and a flat layer sequentially arranged on the base substrate, and anodes located on a side, away from the base substrate, of the flat layer and corresponding to pixel units one by one, wherein a plurality of grooves of which openings are away from the base substrate are formed in the flat layer, a boss is formed between each two adjacent grooves, and an orthographic projection of each pixel unit on the base substrate is overlapped with an orthographic projection of a corresponding groove on the base substrate; and in each pixel unit: the anode is formed on the boss, a hollow structure is arranged at a part, opposite to a corresponding groove of the flat layer, of the anode, and an orthographic projection of the anode on the base substrate is located within an orthographic projection of the boss on the base substrate. The flat layer is provided with openings and thus can accommodate anode deficiencies generated by the anodes; and the hollow structures of the anodes can avoid dark spots finally caused by anode deformation generated by high-pressure washing, and therefore, the yield is increased.