Transparent Electrode Shielding for Array Substrate Aperture Ratio
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Solution Overview
Problem
Liquid crystal display panels face issues with reduced aperture ratio and poor alignment accuracy due to the use of black matrices (BM) for shielding metal traces, leading to suboptimal display effects.
Innovation Solution
An array substrate design featuring a transparent electrode layer with electric field generating and shielding patterns that cover data lines, reducing the need for BM on the counter substrate, thereby improving alignment accuracy and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black matrix is used to shield metal traces on the array substrate, then the shielding effect is achieved, but the aperture ratio is reduced
Solution Approach 1:
The patent extracts the shielding function from the black matrix on the counter substrate and relocates it to the array substrate side through electric field shielding patterns. This allows the black matrix to be reduced or eliminated, thereby increasing the aperture ratio while maintaining the shielding effect against metal trace interference
Solution Approach 2:
The patent transitions the shielding approach from a planar black matrix structure to a three-dimensional electric field shielding structure using transparent electrode patterns. By creating electric field shielding zones through voltage application, the shielding function is achieved in a different dimensional approach that does not consume display area
2Object-affected harmful factors
If black matrix is used for shielding, then the shielding function is provided, but the alignment accuracy deteriorates
Solution Approach 1:
The patent replaces the mechanical/black matrix alignment system with an electric field-based shielding system. The electric field shielding patterns are formed through transparent electrode layers that can be precisely controlled through voltage application, eliminating the need for physical black matrix alignment and thereby improving manufacturing precision
Solution Approach 2:
The patent changes the shielding mechanism from a static physical barrier (black matrix) to a dynamic electric field control system. By adjusting voltage parameters applied to the transparent electrode patterns, the shielding effect can be precisely controlled without requiring high alignment precision of physical structures
3Area of moving object
If transparent electrode layer with electric field shielding pattern is used, then the aperture ratio is increased, but the device complexity increases
Solution Approach 1:
The patent makes the transparent electrode layer multi-functional by integrating both pixel electrode functions and electric field shielding functions into the same structure. The transparent electrode patterns serve dual purposes: forming pixel electrodes for display and creating electric field shielding zones for interference protection, thereby reducing the need for separate shielding structures
Solution Approach 2:
The patent merges the shielding function with the existing transparent electrode layer structure. By combining the pixel electrode pattern and electric field shielding pattern in the same transparent electrode layer, the patent eliminates the need for separate shielding layers or structures, thus managing device complexity while maintaining aperture ratio benefits
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
The solution enhances display panel manufacturing processes, improves panel quality, and increases the pixel aperture ratio by effectively shielding data lines using electric field shielding patterns, minimizing the reliance on BM for light shielding.
Implementation Method 1
the electric field shielding pattern is configured for writing the same common potential as the common electrode bar
Implementation Method 2
the liquid crystal layer is sandwiched between the array substrate and the counter to substrate
Data Source
AI summary
An array substrate includes a first substrate, a driver layer and a transparent electrode layer. The transparent electrode layer is provided at a side of the driver layer away from the first substrate in an insulating manner. The driver layer includes a data line. The transparent electrode layer includes a plurality of electric field generating patterns arranged in an array and an electric field shielding pattern located between adjacent two columns of electric field generating patterns. The electric field generating pattern includes a plurality of common electrode bars and a plurality of pixel electrode bars alternately arranged in a row direction and provided with a first gap therebetween. The electric field shielding pattern is spaced from the electric field generating pattern and is used for writing the same common potential as the common electrode bar. The electric field shielding pattern covers the data line.