Scan Driver Timing for Display Luminance Consistency
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Solution Overview
Problem
Wearable display devices face challenges in maintaining display quality, particularly when switched between modes, as the driving of transistors in visible and non-visible areas can lead to luminance deviations and image sticking phenomena due to differences in driving characteristics.
Innovation Solution
A display device with a driving method that includes distinct pixel areas and scan drivers, where the second mode ensures the second scan lines are driven for a specific period, and the first and third scan lines are driven during this time, maintaining consistent driving characteristics across visible and non-visible areas to prevent luminance deviations and image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device switches between modes with different visible areas, then the display can adapt to different usage scenarios, but luminance deviations and image sticking occur due to different driving characteristics of transistors in visible and non-visible areas
Solution Approach 1:
The patent applies preliminary action by driving the transistors in the non-visible area (first and third pixel areas) before mode switching occurs. Specifically, when switching from first mode to second mode, the scan driver continues to drive scan lines in the first and third pixel areas during the transition period, ensuring that transistors are pre-charged and ready for immediate operation in the new mode, thereby preventing luminance deviations and image sticking
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the scanning sequence and timing of scan lines based on the current mode. The scan driver adaptively changes which pixel areas are actively scanned and at what timing, optimizing the driving characteristics for each mode while maintaining consistency across transitions. This dynamic adjustment ensures that transistors in all areas maintain uniform characteristics regardless of mode changes
2Productivity
If scan lines in all pixel areas are driven sequentially in the first mode, then the entire display area can be updated, but the driving time and complexity increase when switching to the second mode where only the second pixel area is visible
Solution Approach 1:
The patent applies segmentation by dividing the display area into three distinct pixel areas (first, second, and third) with separate scan line groups. This allows the scan driver to independently control and update different segments based on the current mode, enabling efficient updates of only the necessary areas in the second mode while maintaining the capability for full-area updates in the first mode
Solution Approach 2:
The patent implements partial action by driving only the necessary pixel areas in the second mode. When in the second mode, the scan driver focuses on updating the second pixel area (visible area) while minimally driving the first and third pixel areas (non-visible areas) just enough to maintain transistor characteristics, reducing unnecessary driving operations and improving efficiency
Data Source
AI summary
A display device includes a display area to display an image in different areas, the display area including first, second, and third pixel areas that are sequentially arranged, first pixels and first scan lines in the first pixel area, second pixels and second scan lines in the second pixel area, third pixels and third scan lines in the third pixel area, a first scan driver to drive the first scan lines, a second scan driver to drive the second scan lines, and a third scan driver to drive the third scan lines, wherein the second scan lines are sequentially driven, and the third scan lines are driven for a first period during which the second scan lines are driven, and the first scan lines are driven by the first scan driver for a second period, which is after the first period, during which the second scan lines are driven.