AMOLED Anode Segmentation for Light Confinement
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Solution Overview
Problem
Conventional AMOLED display panels suffer from color mixing issues due to light scattering between adjacent pixels, which affects image quality and resolution.
Innovation Solution
The solution involves a display panel manufacturing method that includes forming a substrate with a thin film transistor layer, a planarization layer, a pixel defining layer, and spacers, using a multi-transmittance mask for exposure and development, and creating an anode layer with at least two anodes per pixel unit, where each anode has portions contacting both the planarization and pixel defining layers, positioned between spacers, to focus and enhance light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional top light-emitting structure with resonant cavity is used to enhance light emission, then light intensity is improved, but light scattering occurs that enters adjacent pixels causing color mixing
Solution Approach 1:
The anode layer is segmented into multiple independent anodes, each corresponding to a specific pixel unit. This segmentation ensures that light from each pixel is confined to its own anode area, preventing light scattering into adjacent pixels and thus eliminating color mixing while maintaining high light intensity through the resonant cavity structure.
Solution Approach 2:
The anode layer is designed with different local structures: each anode has a first portion contacting the planarization layer and a second portion contacting the pixel defining layer, forming different angles with the substrate. This local quality variation allows precise control of light emission direction and confinement within each pixel area, preventing color mixing while enhancing light intensity.
2Manufacturing precision
If multiple layers (planarization layer, pixel defining layer, spacer) are formed separately to achieve precise structure control, then manufacturing precision is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The planarization layer, pixel defining layer, and spacer are merged into a single integrated structure formed by one exposure and development process using a multi-transmittance mask. This merging maintains precise structural control for light confinement while significantly reducing manufacturing complexity by eliminating multiple separate fabrication steps.
Solution Approach 2:
The multi-transmittance mask serves multiple functions simultaneously: it defines the planarization layer pattern, creates the pixel defining layer structure, and positions the spacers all in one exposure process. This multi-functionality achieves precise structural control without increasing manufacturing complexity, as a single mask design accomplishes what would otherwise require multiple separate processes.
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 reduces the risk of color mixing and enhances light intensity by ensuring each light-emitting unit is enclosed within the anode area, improving image quality and resolution.
Implementation Method 1
The emitted light is reflected from anode first, and thereafter, because being assisted by resonant cavity, light emitted from cathode is enhanced.
Implementation Method 2
because being assisted by resonant cavity, light emitted from cathode is enhanced
Data Source
AI summary
A display panel and a method for manufacturing the same are provided. According to the present disclosure, one mask is used to form the planarization layer and the pixel defining layer, or to form the planarization layer, the pixel defining layer, and the spacer. Thus, each of the light-emitting units is disposed within the area covered by the anode, and light emitted from the light-emitting unit can be reflected by the anode and be focused. Therefore, the risk where display panel has color mixing problem is decreased, and the intensity of light emitted therefrom is enhanced.