TFT Substrate With Segmented Common Electrode Bridging
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Solution Overview
Problem
Liquid crystal display screens face issues with high RC constant and power consumption due to overlapping metal traces and capacitance between conductive layers, leading to image quality differences and increased power consumption.
Innovation Solution
A TFT substrate design with staggered scan and data lines, featuring a common electrode with bridging portions that connect adjacent common electrodes, reducing overlapping areas and capacitance between metal lines, thereby decreasing RC constant and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal traces are used for gate lines and data lines to ensure good conductivity, then electrical conductivity is improved, but overlapping regions with insulating layers create capacitance that increases RC constant and power consumption
Solution Approach 1:
The common electrode is segmented into multiple isolated common electrode units corresponding to different pixel units, with bridging portions connecting adjacent units. This segmentation reduces the overlapping area between the common electrode and metal traces, thereby reducing capacitance and power consumption while maintaining conductivity through the bridging connections.
2Reliability
If metal traces are used for gate lines and data lines, then good conductivity is achieved, but overlapping regions create capacitance that results in insufficient pixel charging and image quality differences
Solution Approach 1:
The common electrode is divided into multiple isolated units corresponding to different pixel units, reducing capacitance in overlapping regions. This improves pixel charging uniformity and eliminates image quality differences caused by RC constant variations across different regions of the display.
3Reliability
If the common electrode is continuously connected to cover all scan lines and data lines, then electrical connection is maintained, but overlapping area with metal traces increases capacitance and RC constant
Solution Approach 1:
The continuous common electrode is segmented into isolated units with bridging portions connecting adjacent units. This reduces the overlapping area with metal traces and decreases capacitance, while the bridging portions maintain electrical connection between units.
Solution Approach 2:
Bridging portions act as intermediary elements connecting adjacent common electrode units. These bridging portions are strategically positioned to minimize overlapping with metal traces while maintaining electrical connectivity, thus reducing capacitance without compromising electrical connection.
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 design effectively reduces capacitance and power consumption, improving image quality and charging rates, and lowering manufacturing costs by enhancing the connection between common electrodes and reducing the RC delay in the circuit.
Implementation Method 1
each bridging portion is connected with at least two adjacent common electrodes in order to make all of the common electrodes be electrically connected
Data Source
AI summary
The present invention discloses a TFT substrate and a display device. The TFT substrate comprises a scan line, a data line and a common electrode covering the scan line and the data line, wherein the data line and the scan line are disposed in a stagger, in order to divide the crosswise formed region into a plurality of pixel units; the common electrode comprises a plurality of common electrode units and a plurality of bridging portions overlapping with the scan lines and the data lines, wherein the common electrode unit and the pixel unit are correspondingly disposed, each bridging portion is connected with at least two adjacent common electrodes in order to make all of the common electrodes be electrically connected. Through the above ways, the present invention can reduce the RC constant and power consumption, thereby improving the product quality.