Display Storage Line AC Voltage Afterimage Reduction
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Solution Overview
Problem
Display apparatuses suffer from vertical line flicker due to kickback voltage, which degrades display quality, and increasing storage voltage to reduce flicker leads to afterimages.
Innovation Solution
A display apparatus with a storage line receiving an alternating current voltage and a data voltage polarity changed in each frame period, with specific voltage levels applied during charging and blank periods to minimize charge trapping and afterimages, while optimizing storage and data voltages based on image grayscale and luminance analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If storage voltage is increased to reduce kickback voltage and vertical line flicker, then display stability is improved, but afterimages are generated degrading display quality
Solution Approach 1:
The patent applies periodic AC voltage to the storage line instead of DC voltage, creating periodic charge discharge cycles that prevent charge accumulation and eliminate afterimages while maintaining display stability through controlled voltage fluctuations
Solution Approach 2:
The patent changes the voltage parameter from constant DC to time-varying AC with specific amplitude and frequency characteristics, transforming the storage line voltage profile to simultaneously reduce kickback effects and prevent afterimage formation through dynamic voltage modulation
2Loss of information
If data voltage is charged to pixel during gate signal high level, then image data is displayed, but kickback voltage is generated causing vertical line flicker
Solution Approach 1:
The storage line acts as an intermediary element between the data line and pixel, providing a charge storage mechanism that decouples the data writing process from the pixel voltage changes, thereby eliminating kickback voltage while preserving image data display functionality
Data Source
AI summary
A display apparatus includes a display panel which includes a gate line, a data line and a storage line, and displays an image, a gate driving part configured to output a gate signal to the gate line, a data driving part configured to output a data signal based on an image data of the image to the data line, and a voltage providing part configured to apply an alternating current voltage to the storage line.