VR Display Scanning Active Regions to Reduce Screen-Door Artefacts
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Solution Overview
Problem
Current virtual reality displays suffer from 'screen-door' and spatial colour profile artefacts due to manufacturing constraints, such as conductive traces and thin film transistors, which detract from the immersive experience and limit resolution.
Innovation Solution
A head-mounted virtual reality display system with a display element featuring a smaller active region and larger non-active region, where the apparent position of the active region is scanned between sub-frames in a pre-determined fill pattern, synchronized by a processor to adapt colour and luminosity, and an optical element is used to offset the active region, reducing artefacts and increasing perceived resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an RGB display with sub-pixels is used to achieve colour display, then colour reproduction is improved, but screen-door artefacts and non-uniform colour profile appear due to the patterned arrangement of sub-pixels
Solution Approach 1:
The display region is divided into multiple sub-frames, each containing a different subset of pixels. By sequentially activating different pixel subsets in a scanning pattern, the system achieves full colour reproduction while the user perceives a uniform image without screen-door artefacts, as each sub-frame contributes to the overall uniform appearance.
Solution Approach 2:
The system uses periodic scanning of pixels through multiple sub-frames in a predetermined fill pattern. This periodic activation pattern allows the display to present colour information uniformly across the entire display region, eliminating the perception of individual sub-pixels and conductive trace patterns while maintaining full colour reproduction.
2Measurement precision
If the active region size is reduced to increase pixel density, then perceived resolution is improved, but the non-active region becomes larger and more visible, creating screen-door effects
Solution Approach 1:
The display region is segmented into multiple sub-frames with different pixel activation patterns. This segmentation allows the system to effectively utilize the entire display area for displaying image content, making the non-active regions less visible and reducing screen-door effects while maintaining high perceived resolution through the scanning pattern.
Solution Approach 2:
The system introduces a temporal dimension by scanning pixels through multiple sub-frames sequentially. This time-based approach allows the display to present information uniformly across the entire display region, effectively hiding the physical limitations of individual pixel structures and reducing the visibility of non-active regions.
3Adaptability or versatility
If conductive traces and thin film transistors are included in the display structure to drive pixels, then pixel control capability is improved, but these structures create visible patterns that detract from the immersive experience
Solution Approach 1:
The display region is divided into multiple sub-frames with different pixel activation patterns. By scanning through these sub-frames, the system achieves full pixel control capability while the conductive trace patterns remain hidden, as the scanning pattern prevents the user from perceiving the underlying structure.
Solution Approach 2:
The scanning mechanism acts as an intermediary that translates the controlled activation of individual pixels into a uniform visual output. This intermediary process hides the conductive trace patterns and thin film transistor structures from the user's view while maintaining full pixel control capability through the sub-frame scanning sequence.
4Illumination intensity
If a Bayer pattern arrangement is used for pixel placement, then colour information can be captured, but the active region of sub-pixels is smaller than the pixel cluster array, reducing uniformity and increasing artefacts
Solution Approach 1:
The display region is segmented into multiple sub-frames, each with a different pixel activation pattern. This segmentation allows the system to maintain colour information through the Bayer pattern while achieving uniformity by scanning through different pixel subsets, effectively compensating for the smaller active region size of individual sub-pixels.
Solution Approach 2:
The system changes the activation parameters of pixels by scanning through multiple sub-frames with different fill patterns. This dynamic parameter change allows the display to maintain uniform colour luminance profiles while preserving the colour information captured by the Bayer pattern arrangement, compensating for the limited active region size.
Data Source
AI summary
A head mounted virtual reality display system and method is provided. The invention includes a head mounted apparatus worn by a user and a display element having an array of display regions wherein said display region contains a smaller active region having an output aperture with at least one pixel of variable color and luminosity and larger non-active region adjacent to the active region. The invention further includes means for scanning the apparent position of the active region onto the user's eye in both horizontal and/or vertical directions between a plurality of sub-frames within the display region in a pre-determined fill pattern, wherein said sub-frames cover an area including the original position of the larger non-active region and active region on the display region. In addition, a processor is provided which is configured to synchronize activation and adapt the color and luminosity of said at least one pixel in each said active region when the apparent position of the active region is scanned between sub-frames in order to correspond with the desired resolution of a multimedia image to be viewed by the user's eye.