Display Device Sensing Frame Period Synchronization
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Solution Overview
Problem
Display devices with overlapping sensor and display units often experience aberrant visual effects, such as horizontal strip patterns, due to mismatched sensing and display frame rates, which degrade display quality.
Innovation Solution
The implementation of a display device with sensors configured to sense user inputs in sensing frame periods shorter than display frame periods, incorporating non-sensing periods that overlap with display frame periods to synchronize sensing and display operations, thereby reducing interference and aberrant effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sensing frame periods are used with different durations to synchronize with display frame periods, then aberrant visual effects are reduced, but device complexity increases
Solution Approach 1:
The sensing frame periods are dynamically adjusted with varying durations to match display frame periods. The synchronization controller modifies the timing of sensing operations adaptively, changing the duration of sensing frame periods based on the required synchronization with display refresh cycles, thereby eliminating horizontal strip patterns while maintaining manageable system complexity through intelligent temporal coordination.
2Object-affected harmful factors
If non-sensing periods are introduced to overlap with display frame periods, then interference between sensing and display signals is reduced, but productivity decreases
Solution Approach 1:
The sensing operations are structured into periodic cycles comprising sensing periods followed by non-sensing periods. These non-sensing periods are strategically positioned to overlap with display frame periods when signal interference would occur. This periodic alternation between sensing and non-sensing states eliminates horizontal strip patterns by ensuring sensing signals are not active during critical display refresh intervals, while still maintaining adequate sensing coverage during dedicated sensing windows.
Data Source
AI summary
A display device includes pixels to display one or more images in display frame periods and sensors overlapping with the pixels. The sensors sense one or more user inputs in sensing frame periods that are shorter in duration than the display frame periods. A first sensing frame period includes a first non-sensing period that substantially entirely overlaps with a first display frame period. A second sensing frame period includes a second non-sensing period that overlaps with a portion of the first display frame period and a portion of a second display frame period. The first non-sensing period and the second non-sensing period have different durations.