Color Filter Array on Pixel Substrate for LCD Alignment
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Solution Overview
Problem
Conventional LCD panels face misalignment issues during assembly, which can lead to decreased contrast and display quality due to the use of black matrix materials with slight light transmittance, affecting alignment accuracy and fabrication costs.
Innovation Solution
A color filter array on a pixel array substrate with a light-shielding patterned layer and color filter patterns that extend into a light-shielding region, forming a stacked structure to enhance alignment accuracy and light-shielding effect, using materials with relatively low optical density for improved recognition and reduced material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a black matrix material layer with slight light transmittance is used to capture alignment marks, then alignment accuracy is improved, but light-shielding effect deteriorates leading to decreased contrast
Solution Approach 1:
The invention divides the light-shielding region into two functional parts: a lower portion containing the black matrix material layer for alignment mark capture, and an upper portion with a stacked structure of color filter patterns that provide enhanced light-shielding. This segmentation allows each part to perform its specific function optimally without compromising the other.
Solution Approach 2:
The invention implements a nested structure where the black matrix material layer is positioned at the bottom and the stacked color filter patterns are arranged above it within the light-shielding region. This nested arrangement enables the alignment marks to be captured through the semi-transparent lower layer while the upper stacked structures provide the necessary light-shielding effect.
2Ease of manufacture
If conventional separate substrates are used for color filter and TFT array, then fabrication flexibility is improved, but misalignment problem occurs during assembly
Solution Approach 1:
The invention merges the color filter substrate and TFT array substrate into a single integrated substrate. The color filter patterns are directly formed on the same substrate that contains the TFT array, eliminating the need for separate substrate assembly and thereby preventing misalignment issues while maintaining fabrication flexibility.
3Object-affected harmful factors
If black matrix material with high light-shielding capability is used, then contrast is improved, but alignment mark recognition deteriorates
Solution Approach 1:
The invention segments the light-shielding function between two distinct structures: the black matrix material layer optimized for alignment mark recognition with its semi-transparent properties, and the stacked color filter patterns optimized for light-shielding. This segmentation resolves the contradiction by assigning each function to the most suitable structure.
Solution Approach 2:
The stacked color filter patterns act as an intermediary structure that provides the light-shielding function without interfering with the alignment mark capture process. The patterns are positioned and configured to shield light while allowing the underlying black matrix layer to maintain its alignment mark recognition capability.
Data Source
AI summary
A color filter array on pixel array substrate including a substrate, an active device array, a color filter array and a pixel electrode layer is provided. The substrate has a plurality of pixel regions and a light-shielding region. The active device array is disposed on the substrate. The color filter array is disposed on the substrate, and includes a light shielding patterned layer and a plurality of color filter patterns, wherein the light-shielding patterned layer is disposed in the light-shielding region. The color filter patterns are respectively disposed in the pixel regions and extend from the pixel regions into the light shielding regions, wherein the color filter patterns extending from adjacent pixel regions constitute a stacked structure within the light shielding regions. The pixel electrode layer is electrically connected to the active device array.