Inorganic Step Difference Compensating Pattern for LCD Panel Surface Leveling
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Solution Overview
Problem
In liquid crystal display panels, the step height difference between the source and drain electrodes and the surrounding area leads to uneven liquid crystal thickness, causing stains and increased light transmittance and color dispersion due to the organic nature of the color filter layer.
Innovation Solution
A step difference compensating pattern formed on the base substrate using an inorganic material, such as silicon nitride or silicon oxide, is introduced to level the surface, reducing the step height difference and ensuring even liquid crystal thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color filter layer is formed using an organic material, then the color filter can be easily manufactured, but the step height difference causes uneven liquid crystal thickness leading to stains and increased light transmittance
Solution Approach 1:
A step difference compensating pattern is formed on the base substrate before forming the color filter layer. This preliminary structure compensates for the step height difference caused by the organic color filter material, ensuring that the liquid crystal layer maintains uniform thickness across the entire surface, thereby preventing stains and improving display quality
Solution Approach 2:
The patent combines an inorganic step difference compensating pattern with an organic color filter layer. The inorganic material provides structural support and surface leveling, while the organic material provides color filtering functionality. This composite structure allows the color filter to be easily manufactured while compensating for the step height difference that would otherwise cause liquid crystal thickness non-uniformity
2Reliability
If the organic layer is formed on the color filter, then the color filter structure is complete, but the step height difference remains causing uneven alignment liquid or liquid crystal thickness
Solution Approach 1:
The step difference compensating pattern is formed in advance on the base substrate before the color filter and organic layer are formed. This preliminary compensation ensures that even after the complete color filter structure is assembled, the surface remains level, allowing uniform injection and distribution of alignment liquid and liquid crystal without thickness variations
Solution Approach 2:
The step difference compensating pattern acts as an intermediary structure between the base substrate and the color filter assembly. It mediates the surface height variations caused by the organic color filter material, providing a level surface that ensures uniform liquid crystal injection and eliminates the need for additional surface flattening operations
Data Source
AI summary
A liquid crystal display panel includes a base substrate, a first step difference compensating pattern, a gate metal pattern, a semiconductor pattern, a source electrode, a drain electrode, a pixel electrode and a color filter. The first step difference compensating pattern is disposed on the base substrate and includes an inorganic material. The gate metal pattern is disposed on the first step difference compensating pattern and includes a gate electrode and a gate line electrically connected to the gate electrode. The semiconductor pattern is overlapped with the gate electrode. The source electrode is electrically connected to the semiconductor pattern. The drain electrode is electrically connected to the semiconductor pattern and is spaced apart from the source electrode. The pixel electrode is electrically connected to the drain electrode. The color filter is overlapped with the pixel electrode.