Display Device Scan Start Signal Phase Adjustment for Threshold Voltage Sensing
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Solution Overview
Problem
Display devices face challenges in accurately sensing threshold voltage values due to overlapping supply time points of sensing data voltage and display data voltage, which affects the performance of driving transistors in pixels.
Innovation Solution
A display device and driving method that separate the supply time points of sensing data voltage and display data voltage by using a scan start signal adjusting unit to detect sensing target pixels and adjust the phase of the scan start signal, ensuring that sensing and display operations are performed at different times within an image frame period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensing data voltage and display data voltage are supplied at the same time, then the display operation is simplified, but the threshold voltage sensing accuracy deteriorates
Solution Approach 1:
The patent segments the data voltage supply into two distinct parts: sensing data voltage supplied to sensing target pixels and display data voltage supplied to display target pixels. By separating the supply destinations and timing of these voltages, the patent enables accurate threshold voltage sensing without compromising display operation simplicity.
2Productivity
If the supply time points of sensing data voltage and display data voltage are overlapped, then the driving timing is simplified, but the sensing operation reliability deteriorates
Solution Approach 1:
The patent implements periodic action by sequentially alternating between sensing operations and display operations within each frame period. The sensing data voltage is supplied during a dedicated sensing period, followed by display data voltage supply during a display period. This periodic separation ensures reliable sensing operations while maintaining efficient driving timing through structured time multiplexing.
3Speed
If sensing and display operations are performed simultaneously, then the overall processing speed is improved, but the sensing precision deteriorates
Solution Approach 1:
The patent applies preliminary action by completing all sensing operations before initiating display operations within each frame period. The sensing data voltage is supplied first to sense target pixels, and only after sensing is complete does the display data voltage get supplied to display pixels. This sequential arrangement ensures high sensing precision while maintaining overall processing speed through optimized time management.
Data Source
AI summary
Display device includes a scan driver to receive a scan start signal and to supply scan signals of a turn-on level to scan lines in response to the scan start signal; a data driver to receive grayscale values and to supply data voltages corresponding to the grayscale values and a reference data voltage to data lines; pixels connected to the scan lines and the data lines, the pixels including display target pixels configured to receive the data voltages and at least one sensing target pixel configured to receive the reference data voltage; and a scan start signal adjusting unit to detect the display target pixels among the pixels using the grayscale values and to adjust a phase of the scan start signal when at least one of the display target pixels comprises a sensing target pixel.