Gate Driver Progressive Interlaced Scanning VR Display
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Solution Overview
Problem
High-resolution display devices in VR or AR systems face challenges in maintaining high frame rates due to insufficient time for charging pixels with data voltage, exacerbated by increased RC loading as the number of pixels grows, leading to deteriorated image quality.
Innovation Solution
The display device employs a gate driver that outputs gate signals to pixels in a progressive scanning manner for the focus area and an interlaced scanning manner for the non-focus area, with a source driver refreshing data signals at different rates to optimize charging time and maintain high frame rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to achieve high resolution, then the display resolution is improved, but the RC loading increases leading to longer charging time and insufficient time to charge pixels with data voltage
Solution Approach 1:
The display area is segmented into a focus area (center region) and a non-focus area (peripheral region). Different scanning methods are applied to different segments: progressive scanning for the focus area and interlaced scanning for the non-focus area. This segmentation allows the system to maintain high resolution across the entire display while applying optimized charging strategies to different regions based on their importance and RC loading characteristics.
Solution Approach 2:
Different scanning modes are applied to different regions of the display. The focus area receives progressive scanning with higher refresh rates and sufficient charging time, while the non-focus area uses interlaced scanning with lower refresh rates. This local quality approach ensures that critical viewing areas maintain high image quality while peripheral areas use resource-efficient methods, resolving the time constraint problem.
2Speed
If the frame rate is increased to achieve smooth display, then the display smoothness is improved, but the time allocated for charging pixels with data voltage becomes insufficient
Solution Approach 1:
The system dynamically adjusts the scanning method and refresh rate based on the display region. The gate driver circuit switches between progressive scanning mode (for higher frame rates in focus area) and interlaced scanning mode (for lower frame rates in non-focus area). This dynamic adaptation allows the display to achieve high frame rates where needed while maintaining sufficient charging time through the use of interlaced scanning in less critical regions.
Solution Approach 2:
Interlaced scanning implements periodic action by displaying odd and even rows in alternating frames. This periodic pattern allows the system to refresh the display at high rates while providing extended charging time for pixels in the non-focus area, as not all pixels need to be updated every frame. This resolves the contradiction between high frame rate and sufficient charging time.
3Measurement precision
If the number of pixels is increased, then the display resolution is improved, but the RC loading for each row of pixels increases leading to longer charging period
Solution Approach 1:
The display is segmented into focus and non-focus areas with different scanning strategies. In the non-focus area, interlaced scanning is used where only odd rows are scanned in one frame and even rows in the next frame. This segmentation effectively halves the number of rows that need to be charged in each scanning period, reducing the RC loading impact and charging time while maintaining overall high resolution.
Solution Approach 2:
In the non-focus area, the system applies partial action by updating only half of the rows (odd or even) in each frame using interlaced scanning. This partial refresh approach reduces the total charging burden per frame, allowing sufficient charging time for each row despite the high overall pixel count, while still providing smooth display through rapid alternation between odd and even row frames.
Data Source
AI summary
Embodiments relate to a display device including an active display area with pixels arranged in rows and columns, where a focus area of the active display area is operated in a progressive scanning manner and a non-focus area of the active display area is operated in an interlaced scanning manner. The active display area is driven by a gate driver circuit that supplies gate signals the pixels. First stages of the gate driver circuit are coupled to first rows of the pixels that are in the focus area and output first gate signals in the progressive scanning manner. Second stages of the gate driver circuit are coupled to second rows of the pixels that are in the non-focus area and output second gate signals in the interlaced scanning manner.