LCD Data Driver Voltage Difference Generator Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional MVA-LCDs experience color shift and increased complexity in driving circuits due to the need for additional data lines to maintain wide viewing angles, leading to higher production costs and circuit complexity.
Innovation Solution
The implementation of a voltage difference generator in the data driver that maintains a fixed voltage difference between pairs of data lines, allowing each pixel unit to display different luminance without the need for a look-up table, simplifying the driving circuit and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional data lines are added to each pixel unit to provide different electrical fields for reducing color shift, then color shift is reduced, but device complexity increases and production cost increases
Solution Approach 1:
The patent merges the functions of multiple data lines into a single data line by using a time-division multiplexing approach. The same data line is sequentially used to apply different voltages to different pixel electrodes within a pixel unit at different time periods, eliminating the need for separate physical data lines while still achieving the effect of providing different electrical fields to different liquid crystal domains.
Solution Approach 2:
The patent employs dynamic voltage switching where a single data line dynamically changes its voltage output over time to serve multiple pixel electrodes. The voltage on the data line is switched between different levels (e.g., first voltage level for first pixel electrode, second voltage level for second pixel electrode) based on timing signals, creating dynamic electrical fields that reduce color shift without requiring additional static circuit elements.
2Reliability
If the number of data lines is doubled to mitigate color shift, then color shift is reduced, but manufacturing cost increases
Solution Approach 1:
The patent combines the functionality of multiple data lines into one by using time-division multiplexing, where a single data line sequentially connects to different pixel electrodes at different times. This reduces the number of physical data lines required, simplifying the manufacturing process and reducing production costs while maintaining the color shift mitigation effect.
Solution Approach 2:
The single data line is designed to perform multiple functions by sequentially serving different pixel electrodes within a pixel unit. The same data line structure is used to provide different voltage levels to different liquid crystal domains at different times, making the circuit more universal and reducing the overall component count, which directly lowers manufacturing costs.
3Reliability
If additional data lines and doubled driver capacity are used to reduce color shift, then color shift is reduced, but signal transmission bandwidth requirements increase
Solution Approach 1:
The patent uses dynamic voltage switching on a single data line to create different electrical fields for different pixel electrodes at different times. By switching the voltage level on the same data line based on timing signals, the system achieves the effect of multiple data lines without increasing the physical bandwidth requirements, as only one data line needs to transmit signals at any given moment.
Solution Approach 2:
The patent employs periodic switching of voltage levels on the data line to sequentially address different pixel electrodes. The data line alternates between providing first voltage levels to first pixel electrodes and second voltage levels to second pixel electrodes in a periodic manner, allowing the same transmission channel to carry multiple types of signals over time without requiring increased bandwidth capacity.
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 solution effectively mitigates color shift and reduces the complexity of the driving circuit, lowering production costs and improving display quality by allowing for different electrical fields across display regions within each pixel unit.
Implementation Method 1
the voltages outputted by the two data lines of each of the pairs are maintained at a fixed voltage difference
Data Source
AI summary
A liquid crystal display (LCD) including an LCD panel, a gate driver and a data driver is provided. The LCD panel has pixel units, scan lines and several pairs of data lines. Each of the pixel units is electrically connected to a corresponding scan line and a corresponding pair of data lines and has two display regions respectively connected to different data lines. Besides, the gate driver is electrically connected to several scan lines. The data driver is electrically connected to several pairs of data lines. The data driver has a voltage difference generator electrically connected to several pairs of data lines such that the voltages outputted by the pair of data lines are maintained at a fixed voltage difference. Thus, the invention simplifies the complexity of circuit signal processing and lowers the production cost of circuits.