Liquid Crystal Driving Circuit Voltage Control
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Solution Overview
Problem
Existing liquid crystal devices face challenges in maintaining display quality and reducing power consumption, particularly due to irregularities in voltage characteristics among storage and pixel capacitors, which affect gray scale levels and are difficult to implement in IPS and FFS modes where pixel and common electrodes are on the same substrate.
Innovation Solution
A driving circuit that alternately supplies different voltages to common electrodes, setting them to a floating state, and synchronizes these voltages with scanning and data line driving circuits to prevent charge movement between storage and pixel capacitors, ensuring consistent voltage across all electrodes and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the voltage of capacitance lines is changed to reduce power consumption, then power consumption is reduced, but irregularity in voltage characteristics among storage and pixel capacitors causes display quality deterioration
Solution Approach 1:
The common electrodes are divided into first common electrodes and second common electrodes based on their connection to different capacitance lines. This segmentation allows independent voltage control for each group, enabling the system to change capacitance line voltages for power reduction while maintaining stable voltages for other regions, thus preventing display quality deterioration from voltage irregularities.
2Device complexity
If pixel and common electrodes are integrated on the same substrate, then device complexity is reduced, but voltage characteristics among capacitors become irregular and display quality deteriorates
Solution Approach 1:
Different voltage characteristics are applied to different regions of the common electrodes. First common electrodes connected to first capacitance lines receive different voltage treatment compared to second common electrodes connected to second capacitance lines. This local differentiation compensates for capacitor irregularities and maintains consistent gray scale levels across the display while preserving the integrated substrate design.
3Use of energy by stationary object
If the time to change common electrode voltages is reduced, then power consumption is reduced, but voltage stability may be compromised affecting display quality
Solution Approach 1:
The control circuit pre-determines which common electrodes should be connected to which capacitance lines based on their spatial positions and electrical characteristics. This preliminary configuration allows the system to change voltages efficiently without causing instability, as the electrode-capacitance mapping is optimized in advance to maintain voltage stability during rapid transitions.
Data Source
AI summary
A driving circuit for driving a liquid crystal device that has, a first substrate including a plurality of scanning lines, a plurality of data lines, and a plurality of pixel electrodes and a plurality of common electrodes, a second substrate disposed opposite the first substrate, and liquid crystal, the common electrodes being partitioned every horizontal line, the driving circuit includes: a control circuit that alternately supplies a first voltage and a second voltage being higher than the first voltage to the common electrodes and that sets the common electrodes to a floating state; a scanning line driving circuit that sequentially supplies a selection voltage to the plurality of scanning lines; and a data line driving circuit that alternately supplies a positive image signal having a potential higher than the first voltage and a negative image signal having a potential lower than the second voltage to the plurality of data lines.