VR Display Selective Scanning Reduces Power
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Solution Overview
Problem
Current virtual reality display devices inefficiently scan entire areas, including high-resolution foveal and low-resolution peripheral regions, leading to increased driving time and power dissipation without distinguishing between these areas.
Innovation Solution
A VR display device with a display panel divided into foveal, medial, and peripheral areas, where the foveal area displays high-resolution images and the medial and peripheral areas display lower-resolution images, using a gate driver to selectively scan rows of pixels in each area, reducing the number of scans and data output frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the entire display area is scanned sequentially without distinguishing between foveal and peripheral areas, then complete image coverage is achieved, but driving time increases and power consumption increases
Solution Approach 1:
The display area is segmented into three distinct regions: foveal area (first region), medial area (second region), and peripheral area (third region). Each region is assigned different resolution levels and scanning priorities. The gate driver selectively scans rows in the peripheral area with lower frequency compared to the foveal area, reducing overall driving time while maintaining acceptable image quality in less critical regions.
Solution Approach 2:
Different quality levels are applied to different regions of the display. The foveal area receives high-resolution images with frequent scanning, while the peripheral area receives lower-resolution images with reduced scanning frequency. This local differentiation optimizes the balance between image quality and driving efficiency based on human visual perception characteristics.
2Measurement precision
If high-resolution images are displayed in the foveal area, then image clarity is improved, but data processing load and transmission rate increase
Solution Approach 1:
High-resolution image processing is concentrated in the foveal area where users have the best visual acuity, while lower-resolution processing is applied to the medial and peripheral areas. This localized quality approach maintains image clarity where needed while significantly reducing the overall data processing load and transmission requirements.
Solution Approach 2:
Instead of processing the entire display area at high resolution, the system applies high-resolution processing only to the necessary foveal region. This partial action approach achieves the required image clarity for user perception while avoiding the excessive data processing and transmission costs of full high-resolution processing.
3Use of energy by moving object
If low-resolution images are displayed in the peripheral area, then data processing is reduced, but picture quality decreases
Solution Approach 1:
The peripheral area is intentionally assigned lower resolution and reduced scanning frequency, accepting lower picture quality in exchange for reduced data processing requirements. This is justified by human visual perception, which is less sensitive to image quality in peripheral vision compared to central vision.
Solution Approach 2:
The system applies minimal sufficient processing to the peripheral area - just enough to maintain basic image functionality while avoiding excessive processing that would not be perceptible to users. This partial action approach optimizes the trade-off between processing efficiency and perceived quality.
4Reliability
If the gate driver scans all rows in each frame, then complete image refresh is achieved, but power consumption increases
Solution Approach 1:
The scanning operation is segmented by region and priority. The gate driver scans all rows in the foveal area in each frame to ensure complete refresh, while in the peripheral area it selectively scans only a subset of rows. This segmented approach maintains reliable image refresh in critical regions while reducing power consumption through selective scanning in less critical regions.
Solution Approach 2:
In the peripheral area, the gate driver performs partial scanning - refreshing only a portion of the rows in each frame rather than all rows. This partial action reduces the power consumption of the gate driver while maintaining acceptable image refresh performance in the peripheral region where lower quality is already accepted.
Data Source
AI summary
A display device performs efficient driving by selectively scanning a peripheral area processed to have low resolution. The display device includes a gate driver that scans a first subset of pixel rows in a first scan block including only the peripheral area during a first frame and a second frame, and respectively scan during the first frame and the second frame a second subset of pixel rows and a third subset of pixel rows in a second scan block including the medial area and the peripheral area excluding the foveal area, and scan pixel rows of pixels in a third scan block including the foveal area, the medial area, and the peripheral area during the first frame and the second frame.