Liquid Crystal Display Driving Circuit Synchronizing Data Signals
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Solution Overview
Problem
Field sequential color liquid crystal displays experience brightness degradation and color mixing due to differences in the transfer times of data signals.
Innovation Solution
A circuit for driving liquid crystal displays is designed with high and low selection units, transfer units, and a reset unit, utilizing p-MOS and n-MOS transistors to manage data signal transfer and voltage distribution across storage and liquid crystal capacitors, ensuring synchronized and balanced signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data signals are transferred sequentially to liquid crystal capacitors, then the display can show color information, but brightness degradation and color mixing occur due to transfer time differences
Solution Approach 1:
The patent introduces storage capacitors that temporarily hold data signals before they are transferred to liquid crystal capacitors. This preliminary storage action allows the system to synchronize signal transfer times, ensuring that all liquid crystal capacitors receive their data signals simultaneously, thereby preventing brightness degradation and color mixing while maintaining color display capability
2Ease of manufacture
If data signals are transferred sequentially to liquid crystal capacitors, then color information can be displayed, but transfer time differences cause signal synchronization issues
Solution Approach 1:
Storage capacitors are used to preliminarily store data signals at a common node before simultaneous transfer to multiple liquid crystal capacitors. This preliminary storage eliminates transfer time differences by holding all signals until they can be transferred together, thus preventing synchronization issues while maintaining color display functionality
3Device complexity
If simple data signal transfer is used, then circuit complexity is low, but brightness degradation and color mixing occur
Solution Approach 1:
The patent introduces storage capacitors as intermediary elements between the data signal source and the liquid crystal capacitors. These intermediaries temporarily hold the data signals and enable synchronized transfer to all liquid crystal capacitors simultaneously, thereby preventing brightness degradation and color mixing while maintaining relatively simple circuit structure
Data Source
AI summary
A circuit for driving a liquid crystal display includes a high selection unit turned on by a high selection signal, a low selection unit turned on by a low selection signal and transferring a low data signal to one side of the first storage capacitor, a high transfer unit connected to one side of the first storage capacitor, turned on by a high transfer signal and transferring voltage, a low transfer unit connected to one side of the first storage capacitor, turned on by a low transfer signal and transferring the voltage stored at one side of the first storage capacitor to one side of the liquid crystal capacitor, and a reset unit connected to one side of the liquid crystal capacitor, turned on by a reset signal and transferring a center voltage to one side of the liquid crystal capacitor.