Liquid Crystal Display Common Voltage Regenerator
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Solution Overview
Problem
Liquid crystal displays suffer from impaired display quality due to ripples in the common voltage caused by coupling capacitances, leading to crosstalk and reduced image clarity.
Innovation Solution
A liquid crystal display with a common voltage regenerator that receives feedback voltage from storage electrodes, generates a regenerative voltage with opposite phase ripples to mitigate or eliminate voltage ripples, ensuring a stable 5v DC voltage is applied to the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common voltage generator is used to provide common voltage to the liquid crystal panel, then the liquid crystal display can function with basic voltage supply, but voltage ripples occur due to coupling capacitances which impairs display quality
Solution Approach 1:
The patent implements a feedback mechanism where the common voltage regenerator receives the common voltage from the common voltage generator, detects voltage ripples caused by coupling capacitances, and generates a compensating regenerative voltage to cancel out the ripples. This closed-loop feedback system actively maintains stable common voltage, thereby improving display quality by eliminating the harmful voltage fluctuations.
2Device complexity
If the common voltage is provided directly to the common electrode, then the circuit structure remains simple, but coupling capacitances cause voltage ripples leading to crosstalk
Solution Approach 1:
The patent introduces a common voltage regenerator as an intermediary component between the common voltage generator and the common electrode. This regenerator acts as a mediator that buffers and cleans the common voltage signal, removing harmful ripples and crosstalk components before delivering the voltage to the common electrode, thus preventing crosstalk without significantly complicating the overall circuit structure.
Data Source
AI summary
An exemplary liquid crystal display includes a liquid crystal panel, a common voltage generator, and a common voltage regenerator. The liquid crystal panel includes liquid crystal capacitors and storage capacitors. Each liquid crystal capacitor includes a common electrode. Each storage capacitor includes a storage electrode. The common voltage generator is configured to provide a common voltage to the storage electrode. The common voltage regenerator is configured to receive a common feedback voltage from the storage electrode, generate a common regenerative voltage according to the common feedback voltage, and provide the common regenerative voltage to the common electrode.