Liquid Crystal Display Common Electrode Signal Delay and Aperture Ratio
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Solution Overview
Problem
Liquid crystal displays face a decrease in aperture ratio and signal delay due to the arrangement of field generating electrodes on the same substrate, which affects the transmittance and efficiency of the display.
Innovation Solution
The design includes a first substrate with gate lines, data lines, thin film transistors, color filters, pixel electrodes, and a common electrode, where the common voltage line directly contacts the common electrode, and the pixel electrodes and common electrodes overlap each other, with at least one including a branch electrode, to reduce signal delay and increase aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are formed to connect common voltage line and common electrode, then electrical connection is achieved, but aperture ratio decreases
Solution Approach 1:
The patent extracts and eliminates the contact hole structure from the display panel. By making the common electrode extend directly to the edge of the substrate, the need for contact holes to connect the common voltage line is removed, thereby increasing the aperture ratio while maintaining electrical connection through the extended electrode itself
Solution Approach 2:
The common electrode is extended into a new spatial dimension by making it reach the edge of the substrate. This dimensional extension allows the common electrode to serve dual purposes: maintaining electrical connection and increasing the light transmission area, resolving the contradiction between connection reliability and aperture ratio
2Reliability
If common voltage line is extended to common electrode, then electrical connection is established, but signal delay increases
Solution Approach 1:
The patent removes the separate common voltage line from the structure by making the common electrode itself extend to the edge of the substrate. This eliminates the additional signal transmission path that would cause delay, while the common electrode maintains its electrical connection function directly
Solution Approach 2:
The patent merges the function of the common voltage line and common electrode by making the common electrode extend directly to the edge. This consolidation eliminates the separate voltage line and reduces signal transmission distance, thereby reducing signal delay while maintaining electrical connection
3Reliability
If light blocking members are added to prevent light leakage, then display quality improves, but aperture ratio decreases
Solution Approach 1:
The patent extracts and removes the light blocking members from the display structure. By making the common electrode extend to the substrate edge and properly configuring the pixel electrodes, light leakage is prevented without requiring additional blocking structures, thereby maintaining display quality while maximizing aperture ratio
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 enhances the aperture ratio and reduces signal delay by eliminating the need for contact holes and light blocking members, improving transmittance and manufacturing efficiency.
Implementation Method 1
applying a voltage to the field generating electrodes to generate an electric field on the liquid crystal layer, thereby determining the direction of liquid crystal molecules
Implementation Method 2
determining the direction of liquid crystal molecules of the liquid crystal layer, and controlling the polarization of incident light
Implementation Method 3
The liquid crystal display displays an image by applying a voltage to the field generating electrodes to generate an electric field on the liquid crystal layer, thereby determining the direction of liquid crystal molecules and controlling the polarization of incident light
Data Source
AI summary
A liquid crystal display in which the common voltage line is disposed directly on or directly under the common electrode directly contacts the common electrode such that a signal delay of the common voltage line may be reduced and simultaneously a reduction in the aperture ratio of the liquid crystal display may be prevented.