LCD Common Electrode Hollow Layout for Uniform RC Loading
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Solution Overview
Problem
Ununiform RC loadings in different areas of liquid crystal display panels cause varying charging rates, affecting display quality, especially in larger panels where signal delay and capacitance issues become more pronounced.
Innovation Solution
A liquid crystal display panel design featuring a hollow structure in the common electrode layer on the color filter substrate, where the area of the hollow structure increases along a direction from the array routing area to the display area, reducing capacitance and RC loadings uniformly across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a common electrode layer is laid on the whole surface of the color filter layer to achieve complete coverage, then the electrode coverage is improved, but the capacitance between the common electrode layer and signal lines increases, resulting in larger RC loadings
Solution Approach 1:
The patent applies local quality by creating different regions within the common electrode layer: a first region with full coverage and a second region with reduced coverage (hollow structure). This allows different areas to have different electrode densities, reducing capacitance in areas where signal lines are present while maintaining coverage where needed for liquid crystal control.
Solution Approach 2:
The patent extracts or removes portions of the common electrode layer to form hollow structures in the second region. By taking out material from specific areas, the capacitance between the common electrode and signal lines is reduced, thereby decreasing RC loadings while preserving electrode functionality in other regions.
2Area of stationary object
If the display panel size is increased to achieve larger display area, then the display area is improved, but the RC loadings become more severe due to increased capacitance, causing signal delay
Solution Approach 1:
The patent applies local quality by creating different regions within the common electrode layer: a first region with full coverage and a second region with reduced coverage (hollow structure). This allows different areas to have different electrode densities, reducing capacitance in areas where signal lines are present while maintaining coverage where needed for liquid crystal control.
Solution Approach 2:
The patent extracts or removes portions of the common electrode layer to form hollow structures in the second region. By taking out material from specific areas, the capacitance between the common electrode and signal lines is reduced, thereby decreasing RC loadings while preserving electrode functionality in other regions.
3Ease of manufacture
If the common electrode layer maintains uniform thickness and coverage across the display area, then the manufacturing simplicity is improved, but ununiform RC loadings are generated in different areas, causing different charging rates
Solution Approach 1:
The patent applies local quality by creating different regions within the common electrode layer: a first region with full coverage and a second region with reduced coverage (hollow structure). This allows different areas to have different electrode densities, reducing capacitance in areas where signal lines are present while maintaining coverage where needed for liquid crystal control.
Solution Approach 2:
The patent changes the geometric parameters of the common electrode layer by introducing hollow structures with varying sizes and distributions in different regions. By adjusting the area, shape, and distribution of these hollow structures, the patent optimizes RC loadings and charging rates across different areas of the display panel.
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
This design ensures uniform RC loadings and charging rates across the display area, thereby enhancing the display quality by reducing capacitance and signal delay, particularly in larger panels.
Implementation Method 1
capacitance is hence generated between the common electrode layer and the signal lines on the array substrate, thereby resulting in RC loadings
Implementation Method 2
the hollow structure is manufactured by lasering
Data Source
AI summary
The present disclosure provides a liquid crystal display panel and a display device. The liquid crystal display panel includes an array substrate. A hollow structure is defined in a common electrode layer. The hollow structure includes a first hollow structure corresponding to a display area. An area of the first hollow structure progressively increases along a direction from an array routing area to the display area, so that an area of the common electrode layer corresponding to the display area progressively decreases along the direction from the array routing area to the display area, thereby making RC loadings uniform and keeping charging rates in various areas same.