Array Substrate Data Line Routing for Aperture Ratio
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Solution Overview
Problem
The existing technologies for liquid crystal display devices face challenges in improving the aperture ratio of pixel units due to the presence of black matrices, which affect light transmission and lead to issues like light leakage, insufficient data write capacity, and brightness uniformity problems.
Innovation Solution
The solution involves an array substrate design where data lines are arranged to run through the center of pixel units, eliminating the need for a black matrix by using a common electrode layer for light shielding, and a driving method that alternates polarities of driving signals between adjacent columns and frames to reduce vertical crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is provided on CF substrate for light shielding, then light leakage is prevented, but aperture ratio of pixel unit is seriously affected
Solution Approach 1:
The patent extracts the light shielding function from the traditional black matrix structure and relocates it to the common electrode layer. By removing the black matrix from the CF substrate and transferring the light shielding capability to the common electrode layer, the patent eliminates the harmful effect of light leakage while preserving the aperture ratio.
Solution Approach 2:
The common electrode layer is given multiple functions: it serves as both the common electrode for liquid crystal display operation and the light shielding structure. This multi-functionality eliminates the need for a separate black matrix, thereby maintaining aperture ratio while preventing light leakage.
2Area of stationary object
If black matrix is arranged on array substrate, then size of black matrix is reduced, but material limitations prevent widespread adoption
Solution Approach 1:
The patent makes the common electrode layer serve dual purposes: as the common electrode for electrical control and as the light shielding structure. This eliminates the need for separate black matrix materials and simplifies the manufacturing process, overcoming material limitation constraints.
3Area of stationary object
If wiring is thinned to reduce black matrix size, then aperture ratio improves, but data write capacity and in-plane DC deteriorate
Solution Approach 1:
The patent extracts the light shielding function from the wiring structure and assigns it to the common electrode layer. This allows wiring to be optimized for electrical performance (data write capacity and in-plane DC) while the common electrode layer handles light shielding, eliminating the trade-off.
4Area of stationary object
If data lines are arranged to run through pixel units, then aperture ratio is improved, but vertical crosstalk occurs
Solution Approach 1:
The patent introduces the common electrode layer as an intermediary structure that runs through the pixel units alongside data lines. This intermediary structure provides light shielding and electrical isolation, enabling data lines to pass through pixel units without causing vertical crosstalk while maintaining improved aperture ratio.
Data Source
AI summary
Disclosed is an array substrate, a liquid crystal display panel, and a driving method. The array substrate includes a plurality of pixel units, which is arranged in a pixel matrix; and a plurality of data lines, which is arranged to run through the pixel units. With respect to each of the data lines inside of boundary data lines of the pixel matrix, two pixel units electrically connected thereto in sequence are located in adjacent rows and at adjacent columns in the pixel matrix. The array substrate improves an aperture ratio of the pixel unit, which contributes to improvement of the quality of images.