Boost Voltage Maintaining Unit for LCD Crosstalk Reduction
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the voltage generated in the boost line is not properly restored after coupling with other signals, leading to crosstalk and image quality issues due to noise interference.
Innovation Solution
A display device and driving method that includes a boost voltage maintaining unit using a NAND operator and NOT operators to invert and control the boost signal, coupled with a transfer gate switch, to quickly restore the voltage in the boost lines through a clock or scan signal, minimizing crosstalk and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the boost line voltage is generated by coupling with scan and data lines, then the pixel voltage can be boosted to improve response speed, but noise is generated in the boost line causing crosstalk and image quality degradation
Solution Approach 1:
The patent extracts the harmful noise component from the boost line by introducing a separate restoring mechanism. The boost voltage maintaining unit selectively restores the boost line voltage to its initial state, separating the useful boosting function from the harmful noise generation, thereby eliminating crosstalk while preserving the response speed improvement benefit.
Solution Approach 2:
The patent converts the harmful noise generated during coupling into a beneficial restoring action. The noise that would normally degrade image quality is instead utilized as a trigger for the restoring mechanism, which actively corrects the voltage deviation and eliminates crosstalk, turning the harmful effect into a useful correction process.
2Object-generated harmful factors
If the boost line voltage is not restored until the gate voltage is off, then the coupling influence is reduced, but the output signal of the boost line increases and crosstalk is generated
Solution Approach 1:
The patent applies preliminary action by restoring the boost line voltage to its initial state before the gate voltage is completely turned off. The boost voltage maintaining unit activates during the transition period, proactively correcting voltage deviations before they can cause significant crosstalk or signal distortion, thereby ensuring signal accuracy while minimizing coupling influence.
3Productivity
If the boost voltage is applied to all pixels simultaneously, then the response speed is improved, but voltage deviations and crosstalk increase due to coupling effects
Solution Approach 1:
The patent segments the pixel array into rows and applies the boost voltage row-by-row rather than simultaneously to all pixels. The scan driver activates boost signals for specific rows during their respective scan periods, isolating the coupling effects to individual rows and preventing voltage deviations from propagating across the entire array, thereby maintaining voltage uniformity while preserving response speed improvement.
Data Source
AI summary
A display device includes: a plurality of pixels; a data driver connected to the plurality of pixels by a plurality of data lines and applying data signals to the plurality of pixels; a scan driver connected to the plurality of pixels by a plurality of scan lines and applying scan signals to the plurality of pixels for the data signals to be applied to the plurality of pixels; a boost driver connected to the plurality of pixels by a plurality of boost lines and applying boost signals, boosting the pixel voltage charged to the plurality of pixels by the data signals, to the plurality of pixels; and a boost voltage maintaining unit applying a restoring voltage restoring the voltage in the plurality of boost lines by the scan signal to the plurality of boost lines. The voltage generated in the boost line by the coupling may be quickly restored and the crosstalk may be minimized, thereby improving the image quality.