Liquid Crystal Display Device Dual Gate Bus Line Black Matrix
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in reducing the number of data bus lines, which increases manufacturing costs and can lead to a decrease in pixel aperture ratio due to the need for additional gate bus lines and protruding structures.
Innovation Solution
A liquid crystal display device configuration with a dual scan line method, where two gate bus lines are provided for each row of pixels, and a black matrix is used to integrate light-shielding for TFTs and contact holes, reducing the number of data bus lines and maintaining a high pixel aperture ratio by overlapping gate bus lines with pixel electrodes and using a protruding structure for orientation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of data bus lines is reduced, then manufacturing cost decreases, but the number of gate bus lines must increase which complicates the wiring structure
Solution Approach 1:
The patent merges the light-shielding functions for TFTs and contact holes into a single integrated black matrix structure. This consolidation reduces the number of separate wiring and shielding elements needed, thereby simplifying the overall wiring structure while maintaining the reduced data bus line configuration that lowers manufacturing costs
2Ease of manufacture
If two gate bus lines are provided for each row of pixels, then the number of data bus lines can be reduced, but the pixel aperture ratio decreases due to additional wiring space requirements
Solution Approach 1:
The patent positions the black matrix in the vertical dimension to overlap with pixel electrodes in the horizontal dimension. This spatial arrangement in another dimension allows the black matrix to perform light-shielding without occupying additional horizontal space within the pixel area, thereby maintaining pixel aperture ratio while supporting the dual gate bus line configuration
Solution Approach 2:
The black matrix serves as an intermediary element that mediates between the gate bus lines and pixel electrodes. By positioning the black matrix to overlap pixel electrodes, it enables the gate bus lines to be routed without directly encroaching on pixel area, thus preserving aperture ratio while allowing reduced data bus line configuration
3Area of stationary object
If gate bus lines cross pixel electrodes, then wiring space is optimized, but light leakage occurs through the transistor and contact hole regions
Solution Approach 1:
The patent converts the potentially harmful effect of gate bus lines crossing pixel electrodes into a beneficial arrangement by introducing a black matrix that overlaps the pixel electrodes. This black matrix structure transforms the light leakage problem into an opportunity for integrated light-shielding that also optimizes wiring space, as the black matrix can be positioned to cover both TFTs and contact holes without requiring separate shielding structures
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 configuration effectively reduces the number of data bus lines, lowers manufacturing costs, and maintains a high pixel aperture ratio by integrating light-shielding and orientation control, resulting in improved display quality and reduced light leakage.
Implementation Method 1
a liquid crystal layer disposed between the thin film transistor substrate and the opposite substrate, the liquid crystal layer being formed of liquid crystal material having a negative dielectric anisotropy
Implementation Method 2
a black matrix disposed on an outside of the liquid crystal layer, the black matrix having light-shielding characteristics
Data Source
AI summary
The TFT substrate of this liquid crystal display device has: a first gate bus line and a second gate bus line; a first data bus line; a first TFT and second TFT that are respectively connected to the first and second gate bus line and are both connected to the first data bus line; and a first pixel electrode and second pixel electrode that are respectively connected to the first TFT and the second TFT through a contact hole. The first and second gate bus line traverse the first pixel electrode and the second pixel electrode, and a black matrix has a portion that integrally covers the first TFT and the contact hole, and a portion that integrally covers the second TFT and the contact hole.