Liquid Crystal Display Common Trunk Wiring Laminated Structure
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in miniaturization due to display defects such as flicker, caused by high electric resistance in the common trunk wiring, which is exacerbated by the reduction in width of the common trunk wiring for smaller frames.
Innovation Solution
The implementation of a laminated structure for the common trunk wiring using multiple conductive layers, including a transparent conductive layer and additional conductive layers, increases the cross-sectional area, thereby reducing electric resistance and enabling further miniaturization without increasing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the common trunk wiring is miniaturized to reduce frame size, then the display panel achieves miniaturization, but the electric resistance of the common trunk wiring increases causing display defects such as flicker
Solution Approach 1:
The patent transitions from a single-layer common trunk wiring to a multi-layer laminated structure. By stacking multiple conductive layers (first conductive layer, second conductive layer, third conductive layer) vertically, the effective cross-sectional area increases without expanding the horizontal footprint, thus reducing resistance while maintaining miniaturized frame dimensions.
Solution Approach 2:
The patent employs a composite laminated structure combining multiple conductive materials with different properties. The first conductive layer uses a material with specific sheet resistance, the second layer uses a different material, and the third layer uses yet another material. This composite approach optimizes the overall resistance characteristics while enabling miniaturization.
2Length of moving object
If the width of the common trunk wiring is reduced for miniaturization, then the frame size decreases, but the electric resistance increases leading to signal delay variation
Solution Approach 1:
The patent compensates for reduced wiring width by increasing the vertical dimension through multi-layer stacking. The laminated structure of three conductive layers provides sufficient total conductive cross-section to maintain low resistance even when each individual layer has reduced width, ensuring consistent signal delay across the miniaturized display.
Solution Approach 2:
The patent changes the electrical parameters of the wiring system by using multiple layers with different sheet resistance values. The first conductive layer has a first sheet resistance, the second layer has a second sheet resistance, and the third layer has a third sheet resistance. By carefully selecting these parameters, the overall resistance is optimized for miniaturized applications.
3Illumination intensity
If a transparent conductive film material is used for the signal supply electrode to prevent transmissivity reduction, then the display quality is maintained, but the electric resistance becomes larger compared to metal wiring
Solution Approach 1:
The patent creates a composite conductive structure combining multiple transparent conductive film layers. Each layer contributes to the overall conductivity, and the stacked configuration provides sufficient total conductance while maintaining transparency. This composite approach achieves low resistance without sacrificing transmissivity, unlike single-layer transparent conductors.
Solution Approach 2:
The patent reduces the resistance of transparent conductive electrodes by stacking multiple transparent conductive layers vertically. The increased total thickness of transparent conductive material provides lower resistance while maintaining optical transparency, solving the contradiction between transmissivity and electrical resistance.
Data Source
AI summary
The present invention provides a liquid crystal display device which can be miniaturized while preventing display defects such as flicker. The present invention relates to a liquid crystal display device including a wiring connected to an electrode to supply a common signal. The electrode includes a first electrode portion formed in a transparent conductive layer. The wiring is formed outside a display region and includes at least one of the first wiring portion and a second wiring portion and a third wiring portion facing the at least one of the first wiring portion and the second wiring portion. The first wiring portion, the second wiring portion, and the third wiring portion are respectively formed in a first conductive layer, a second conductive layer, and a third conductive layer.