Active Device Array Substrate Transparent Pad Layer Black Matrix
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels suffer from display quality deterioration due to liquid crystal disclination caused by recesses between color filter patterns and black matrix layers, making it difficult to inspect defects in scan and data lines optically.
Innovation Solution
An active device array substrate with a transparent pad layer and a black matrix layer is introduced, where the black matrix layer is positioned above the transparent pad layer to cover pixel electrodes and fill recesses, reducing disclination and allowing for easier defect inspection by providing a planar surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the black matrix layer is disposed directly on the first passivation layer with color filter patterns, then the structure is simple and manufacturing is easier, but recesses are formed between color filter patterns causing liquid crystal disclination and display quality deterioration
Solution Approach 1:
A transparent pad layer is introduced as an intermediary between the first passivation layer and the black matrix layer. This transparent pad layer fills the recesses formed by the color filter patterns, creating a planar surface that prevents liquid crystal disclination while maintaining the simplicity of the manufacturing process. The transparent pad layer acts as a mediator that resolves the conflict between structural simplicity and display quality.
Solution Approach 2:
The solution adds a new layer (transparent pad layer) in the vertical dimension to fill the recesses created by the color filter patterns. This dimensional addition creates a planar surface for the black matrix layer, eliminating the harmful recesses without complicating the horizontal layout or manufacturing steps.
2Object-affected harmful factors
If the black matrix layer covers the entire surface including outer regions, then light shielding is improved, but defects in scan and data lines become difficult to inspect optically
Solution Approach 1:
The black matrix layer is segmented into different regions: a first black matrix layer that covers the pixel electrodes and color filter patterns for light shielding, and a transparent pad layer region that remains transparent for defect inspection. This segmentation allows different portions of the structure to serve different functions - light shielding where needed and optical access where required for quality control.
Solution Approach 2:
The transparent pad layer provides local transparency in specific regions (where defects need inspection) while the black matrix layer provides light shielding in other regions (pixel areas). This local differentiation of optical properties allows simultaneous achievement of light shielding and defect inspection capabilities.
Data Source
AI summary
An active device array substrate including a substrate, a plurality of scan lines, a plurality of data lines, a plurality of active devices, a first passivation layer, a transparent pad layer, a plurality of color filter patterns, a second passivation layer, a plurality of pixel electrodes, and a black matrix layer is provided. Each of the active devices is electrically connected to one of the scan lines and one of the data lines, respectively. The transparent pad layer having a plurality of openings for accommodating the color filter patterns is disposed on the first passivation layer located above the scan lines and the data lines. The first passivation layer, the color filter patterns and the second passivation layer have a plurality of contact windows therein. The black matrix layer is disposed above the transparent pad layer to cover a portion of the pixel electrodes.