Liquid Crystal Panel Common Electrode Voltage Adjustment
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Solution Overview
Problem
The instability and aging of thin film transistors in liquid crystal panels cause asymmetry in driving voltage relative to common voltage, leading to increased flicker and degraded display quality over time.
Innovation Solution
A device comprising a detection unit, data collection unit, process unit, and adjustment unit that detects flicker conditions, collects common voltage values, calculates a control signal to adjust the common voltage, and applies a second common voltage to maintain flicker within a predetermined range, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common voltage is set at the initial position (128th gray scale) to achieve symmetrical driving voltage, then the flicker is minimized initially, but the flicker increases over time due to transistor aging and voltage drift
Solution Approach 1:
The patent measures the common voltage at different gray scales before the liquid crystal panel is driven for an extended period, and determines an optimal common voltage position in advance. This preliminary measurement and determination of the compensation value allows the system to pre-correct for expected voltage drift, maintaining display quality over the lighting period without requiring real-time adjustments during operation.
Solution Approach 2:
The patent implements a feedback mechanism where the common voltage is measured at multiple gray scales (including 0th, 128th, and 255th gray scales), the measurements are processed to calculate a compensation value, and this compensation value is used to adjust the common voltage position. The detection unit detects flicker conditions, and the adjustment unit applies the compensation to maintain optimal display quality, creating a closed-loop system that compensates for transistor aging effects.
2Manufacturing precision
If the common voltage position is fixed initially, then the driving voltage is symmetrical and flicker is minimized at the start, but voltage asymmetry develops over time due to transistor aging
Solution Approach 1:
The system performs preliminary measurements of the common voltage at critical gray scales (0th, 128th, 255th) before extended operation, calculates the voltage drift characteristics in advance, and determines a compensation value that will maintain voltage symmetry over the lighting period. This upfront characterization allows the system to pre-establish the optimal common voltage position that accounts for expected aging effects.
Solution Approach 2:
The patent changes the parameter of common voltage position from a fixed initial value to a dynamically adjusted value based on measured drift characteristics. By measuring the common voltage at multiple gray scales and calculating a compensation value, the system adjusts the common voltage position parameter to compensate for transistor aging, thereby maintaining driving voltage symmetry and reducing flicker over time.
3Device complexity
If no voltage adjustment is made, then the device structure remains simple, but flicker increases and display quality degrades over time
Solution Approach 1:
The patent implements a voltage adjustment system that performs preliminary measurements of common voltage at multiple gray scales before extended operation, calculates compensation values based on these measurements, and applies the compensation to maintain display quality. This upfront characterization and compensation approach maintains relatively simple device structure while effectively preventing flicker and quality degradation over time.
Data Source
AI summary
The present invention provides a liquid crystal panel common electrode voltage adjustment device and a liquid crystal panel common electrode voltage adjustment method. The liquid crystal panel common electrode voltage adjustment device includes a detection unit, a data collection unit, a process unit and an adjustment unit, and the detection unit detects a flicker condition of the liquid crystal panel in an activation state, and the data collection unit collects a common voltage value as the flicker exceeds a predetermined range to obtain a first common voltage, and the process unit obtains a control signal according to the first common voltage, and the adjustment unit sends a corresponding adjustment signal, and the adjustment signal adjusts the common voltage to be a second common voltage, and as the second common voltage is applied to the liquid crystal panel, the flicker of the liquid crystal panel is controlled in the predetermined range.