OLED Pixel Structure Using Groove Definition
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Solution Overview
Problem
The existing OLED display manufacturing process is complex and environmentally polluting due to the need for a pixel defining layer, which requires coating, exposing, and curing processes, and uses organic materials that can contaminate the environment.
Innovation Solution
A pixel structure and manufacturing method that eliminates the need for a pixel defining layer by forming groove structures on the thin film transistor array layer, allowing for direct inkjet printing of the light-emitting layer into defined pixel regions, thereby simplifying the process and avoiding environmental pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pixel defining layer is prepared on the thin film transistor array layer to enable accurate light-emitting layer formation, then the light-emitting layer can be accurately formed at the corresponding position, but the manufacturing process becomes complex and requires additional coating, exposing, and curing steps
Solution Approach 1:
The patent extracts and removes the pixel defining layer from the manufacturing process. Instead of adding a separate pixel defining layer, the invention uses the existing thin film transistor array layer structure (specifically the protruding portion formed by the source/drain electrode and insulating layer) to directly define the pixel opening area, thereby eliminating unnecessary process steps while maintaining positioning accuracy
Solution Approach 2:
The patent makes the thin film transistor array layer structure serve multiple functions: it not only provides the transistor functionality but also defines the pixel opening area for light-emitting layer deposition. The protruding portion formed by the source/drain electrode and insulating layer simultaneously acts as both the electrical connection structure and the pixel boundary definition structure
2Manufacturing precision
If organic materials are used for the pixel defining layer to enable precise patterning, then the pixel opening area can be accurately defined, but environmental pollution occurs due to the use of organic materials
Solution Approach 1:
The patent extracts and eliminates the organic pixel defining layer material from the process. By using the inorganic thin film transistor array layer structure (metal electrodes and inorganic insulating layers) to define the pixel opening area, the invention removes the source of organic pollution while maintaining the ability to accurately define pixel boundaries
Solution Approach 2:
The patent changes the material parameter of the pixel defining structure from organic materials to inorganic materials. The pixel opening area is defined by the physical structure of the source/drain electrode and insulating layer, which are inorganic materials, thereby changing the chemical composition parameter to eliminate environmental pollution
Data Source
AI summary
The present disclosure relates to a pixel structure. The pixel structure may include a base substrate; a first insulating island on a side of the base substrate; a first electrode on a side of the first insulating island opposite front the base substrate; a second electrode on the base substrate and at a peripheral area of the first insulating island; an active layer electrically connected to the first electrode and the second electrode; a second insulating layer on a side of the active layer opposite from the base substrate; a gate electrode on a side of the second insulating layer opposite from the base substrate; and a third insulating layer on a side of the gate electrode opposite from the base substrate.