Transparent Photoresist Planarization for Display Resolution
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Solution Overview
Problem
Current display panels fail to meet increasing demands for high resolution and transmittance, particularly in larger displays, as they lack sufficient pixel density and power efficiency.
Innovation Solution
A display panel manufacturing method involving the use of a transparent photoresist material for both forming transparent filters and planarization layers, ensuring uniform thickness and improved flatness, which allows for higher resolution and transmittance by adjusting the transparent filter height to match other positions, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to improve resolution, then the pixel density increases, but the pixel size decreases making manufacturing more difficult
Solution Approach 1:
The filter layer is segmented into multiple color filter regions (red, green, blue, and transparent/white) corresponding to different sub-pixels. This segmentation allows each region to be optimized independently for its specific function while maintaining overall high resolution. The color filters are formed in discrete patterns that align with the pixel matrix, enabling precise control over light transmission characteristics for each sub-pixel.
Solution Approach 2:
Different regions of the filter layer have different optical properties: color filter regions provide wavelength selection while transparent regions provide high transmittance. The planarization layer is applied locally to flatten the surface irregularities caused by the color filter structures, ensuring uniform light transmission across the entire display while maintaining the specialized functions of each filter region.
2Measurement precision
If the pixel size is reduced to increase pixel density, then the resolution improves, but the transmittance decreases
Solution Approach 1:
The filter structure is segmented into color filter portions and transparent filter portions. The transparent filter portions (corresponding to white sub-pixels) have no color absorbing materials, providing high light transmittance. This segmentation allows the display to achieve high resolution through the color filters while maintaining high transmittance through the transparent regions, effectively doubling the light transmission efficiency compared to traditional RGB-only designs.
Solution Approach 2:
The planarization layer serves multiple functions: it flattens the surface irregularities caused by the color filter structures, provides a uniform base for subsequent electrode and connection layer formation, and ensures consistent light transmission across the entire display surface. This multi-functionality allows the layer to support both high resolution and high transmittance requirements simultaneously.
3Measurement precision
If the filter structure is added to achieve color display, then the image quality improves, but the surface flatness deteriorates
Solution Approach 1:
The planarization function is extracted as a separate layer formed over the color filter structure. This planarization layer is specifically designed to compensate for the surface irregularities introduced by the color filter patterns, providing a flat surface for subsequent processing steps while preserving the color filtering functionality of the underlying filter structure.
Solution Approach 2:
The display structure employs composite material layers including the color filter layer, transparent filter layer, and planarization layer. Each layer is designed with specific material properties that contribute to the overall performance: the color filters provide wavelength selection, the transparent filters provide high transmittance, and the planarization layer provides surface flatness. The composite structure allows all these functions to coexist without compromising each other.
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
The method achieves improved resolution and transmittance, resulting in more vivid and power-efficient display panels that can meet the requirements of high-definition displays like 4K UHD televisions.
Implementation Method 1
forming a transparent filter, wherein the same transparent photoresist material is used in the step of forming a transparent filter and the step of forming a planarization layer on the filter
Implementation Method 2
the step of exposing and developing the transparent photoresist layer by using a mask comprises baking the exposed and developed transparent photoresist layer
Data Source
AI summary
A display panel and a manufacturing method therefor are disclosed. The display panel includes a plurality of pixels and corresponding filters. A planarization layer is arranged on the filters. The planarization layer and a transparent filter are made of the same transparent photoresist material. The manufacturing method includes: preparing a filter; and forming a planarization layer on the filter, where preparing a filter includes forming a transparent filter, where the same transparent photoresist material is used in the operation of forming the transparent filter and in the operation of forming the planarization layer on the filter.