OLED Array Substrate Photolithography Resolution
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Solution Overview
Problem
Current OLED and QLED display technologies face limitations in resolution due to alignment accuracy issues in mask evaporation processes, leading to signal crosstalk and non-uniform film thickness problems, which hinder the improvement of display quality and material utilization.
Innovation Solution
An OLED array substrate with a light emitting layer that includes photocurable or photodegradable functional groups, eliminating the need for a pixel defining layer by using a photolithography process to form the light emitting layer, which wraps the first transport layer and covers the first electrode, thereby improving resolution and reducing signal crosstalk and non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If mask evaporation process is used for high-resolution OLED fabrication, then material utilization is improved, but alignment accuracy deteriorates and resolution is limited
Solution Approach 1:
The patent replaces the mechanical mask evaporation process with a photolithography-based solution. The light-emitting layer is formed using photomasks and light exposure, eliminating the need for complex alignment mechanisms in vacuum evaporation. This substitution resolves the contradiction by achieving high resolution through optical patterning rather than mechanical alignment, while maintaining material efficiency through the photopolymerization process.
2Object-generated harmful factors
If pixel defining layer is prepared to eliminate signal crosstalk, then signal crosstalk is reduced, but film uniformity deteriorates
Solution Approach 1:
The patent extracts and eliminates the pixel defining layer from the structure by directly forming the light-emitting layer in the desired pixel pattern through photolithography. This removes the source of film uniformity problems (the pixel defining layer's large height) while simultaneously eliminating signal crosstalk through the direct patterning approach. The light-emitting layer itself defines the pixel boundaries without requiring an additional defining layer.
Solution Approach 2:
Instead of using a pixel defining layer to prevent crosstalk (traditional approach), the patent inverts the approach by directly forming the light-emitting layer in the final pixel pattern through photolithography. This eliminates the need for the pixel defining layer entirely, resolving both the crosstalk and film uniformity issues simultaneously.
3Loss of substance
If vacuum evaporation technology is used for AMOLED manufacturing, then material utilization is improved, but equipment cost and maintenance cost increase
Solution Approach 1:
The patent replaces the expensive vacuum evaporation equipment with standard photolithography equipment. The light-emitting layer is formed through photomask exposure and photopolymerization, which uses conventional semiconductor manufacturing equipment rather than specialized vacuum evaporation systems. This substitution dramatically reduces equipment investment and maintenance costs while maintaining material utilization efficiency through the photopolymerization process.
4Loss of substance
If inkjet printing process is used for AMQLED fabrication, then material utilization is improved, but resolution is limited due to pixel defining layer requirements
Solution Approach 1:
The patent replaces the inkjet printing process with photolithography for light-emitting layer formation. By using photomasks and light exposure, the system achieves higher resolution than inkjet printing while eliminating the need for pixel defining layers. The photopolymerization process allows direct patterning of the light-emitting layer at the final resolution required, combining the material efficiency of solution processing with the high resolution of optical patterning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables high-resolution pixel structures without the need for expensive evaporation processes, reduces material waste, and enhances display quality by eliminating signal crosstalk and non-uniform film thickness issues, promoting industrialization and cost-effectiveness.
Implementation Method 1
the light emitting layer material for forming the light emitting layer comprises a photopolymerizable functional group
Implementation Method 2
the light emitting layer material for forming the light emitting layer comprises a photodegradable group
Data Source
AI summary
An OLED array substrate includes a plurality of pixel structure, including a plurality of pixel units, each of the plurality of pixel units including: a base substrate; a first electrode disposed above the base substrate; a light emitting layer disposed on a side of the first electrode facing away from the base substrate; a second functional layer disposed on a side of the light emitting layer facing away from the base substrate, wherein the second functional layer wraps the light emitting layer.