Liquid Crystal Display Gate and Common Voltage Line Routing
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Solution Overview
Problem
Conventional liquid crystal displays experience afterimage and remaining voltage issues due to non-uniform charge distribution across pixels, caused by delay errors in voltage application across the liquid crystal display panel.
Innovation Solution
The liquid crystal display employs a configuration where even and odd gate lines and common voltage lines are strategically routed to compensate for each other's delay times, ensuring uniform charge distribution across pixels by alternating the direction of voltage transfer along the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the common voltage is applied to both ends of the liquid crystal display by shorting both ends of the common voltage line, then the delay error is minimized at the first and last pixels, but the delay error occurs in the central column pixels and asymmetrical charge distribution occurs across all pixels
Solution Approach 1:
The common voltage line is divided into multiple segments (first common voltage line and second common voltage line) that extend in opposite directions from different ends of the liquid crystal display. This segmentation allows each segment to serve a specific region, compensating for signal propagation delays and achieving uniform charge distribution across all pixels.
Solution Approach 2:
The patent introduces asymmetrical routing of common voltage lines where the first common voltage line extends from the first end toward the center and the second common voltage line extends from the second end toward the center. This asymmetrical configuration compensates for the scanning delay by creating opposite-direction voltage propagation paths, ensuring uniform charge distribution even though the routing itself is asymmetrical.
2Productivity
If the gate voltage is scanned from left to right across the display panel, then the data voltage can be applied sequentially to all pixel electrodes, but delay error occurs causing non-uniform charge distribution especially at central column pixels
Solution Approach 1:
The patent applies preliminary action by pre-establishing multiple common voltage lines that extend in opposite directions before the gate voltage scanning begins. This preliminary configuration ensures that when the gate voltage is scanned, the common voltage is already available at multiple locations, compensating for the delay in voltage propagation and ensuring uniform charge distribution across all pixels.
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 prevents or reduces afterimage phenomena and remaining voltage by maintaining uniform charge in each pixel, thereby improving the display's performance and reducing asymmetrical charge-related issues.
Implementation Method 1
The liquid crystal element CLC controls the amount of light transmitted or shields light by changing the arrangement of liquid crystal molecules with an electric field in a liquid crystal layer therein
Data Source
AI summary
A liquid crystal display includes data lines extending in a first direction, gate lines extending in a second direction between a first side and a second side of the liquid crystal display and crossing the data lines, and common voltage lines crossing the data lines and parallel with the gate lines. The gate lines include even gate lines coupled to a gate driver at near the first side and odd gate lines coupled to the gate driver at near the second side. The common voltage lines include even common voltage lines coupled to a common voltage supplier at near the second side and odd common voltage lines coupled to the common voltage supplier at near the first side.