Step Structure Blue Color Filter for Display Panel
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Solution Overview
Problem
Large-sized liquid crystal display panels using negative vertical alignment technology suffer from significant color shift issues at different viewing angles, particularly with blue pixel subunits exhibiting faster brightness saturation, leading to bluish image quality defects, which existing solutions attempt to address by subdividing pixels and applying different driving voltages, increasing manufacturing costs and reducing transmittance.
Innovation Solution
The implementation of a step structure in the blue color filter of the third pixel subunit, with varying thicknesses, allows for adjustment of optical characteristics to compensate for short wavelength and high color shift conditions, eliminating the need for subdividing pixels and additional driving components, thereby maintaining transmittance and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blue color filter is formed to have a step structure, then the chromatic aberration and color shift problems are solved, but the manufacturing process becomes more complex
Solution Approach 1:
The blue color filter is segmented into multiple regions with different thicknesses (first thickness and second thickness), creating a step structure that differentially adjusts optical paths for different viewing angles. This segmentation allows the filter to compensate for chromatic aberration and color shift by providing varying optical delays to blue light depending on the viewing angle.
Solution Approach 2:
Different regions of the blue color filter are given different local qualities (thicknesses) to optimize performance for specific viewing conditions. The first thickness region addresses front-viewing performance while the second thickness region addresses side-viewing performance, ensuring optimal display quality across different viewing angles without requiring a complete redesign of the entire filter.
2Reliability
If additional metal trace or TFT components are designed for driving sub-pixels, then color shift defect is improved, but the transparent opening area is reduced and transmittance is affected
Solution Approach 1:
The patent replaces the mechanical/electrical approach of adding metal traces and TFT components with an optical approach using a stepped color filter structure. Instead of using additional driving components to correct color shift, the invention uses the physical structure of the blue color filter itself to optically compensate for chromatic aberration and color shift, thereby avoiding any reduction in transparent opening area.
3Reliability
If additional components are added for color shift correction, then display performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the color shift correction function into the existing blue color filter structure by adding a step structure, rather than requiring separate additional components. This integration allows the color filter to perform both its primary function of filtering blue light and the secondary function of compensating for chromatic aberration and color shift, thereby reducing manufacturing costs by eliminating the need for separate correction components.
Data Source
AI summary
Disclosed an array substrate and a display panel, wherein the array substrate comprises a substrate, a plurality of pixel units disposed on the substrate, wherein each of the pixel units comprises a first pixel subunit, a second pixel subunit and a third pixel subunit, and a color filter disposed on each of the pixel subunits, wherein the color filter is located between the substrate and the second substrate, and the color filter of the third pixel subunit has a step structure. The display panel comprises the array substrate above and a second substrate, wherein the second substrate being disposed opposite to the array substrate.