HMD Display with Offset High-Definition Foveal Region
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Solution Overview
Problem
Head mounted display devices face increased processing loads when striving for higher definition images and improved performance for moving and three-dimensional displays, particularly due to the large angular field of view provided, which demands higher resolution per pixel.
Innovation Solution
The implementation of a display device with a divided display region containing low-definition and high-definition sections, where the high-definition sections have pixels with smaller areas and are positioned offset from the center of the display region, aligning with the human eye's central fovea to reduce processing load by targeting high-resolution areas effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher definition is pursued in head mounted display devices, then image quality is improved, but processing load increases excessively
Solution Approach 1:
The patent applies local quality by dividing the display region into high-definition and low-definition areas. The high-definition display section uses smaller pixels with higher density specifically in regions where the human eye is most sensitive (central fovea area), while peripheral regions use larger pixels with lower density. This resolves the contradiction by providing high definition only where needed, reducing overall processing load while maintaining perceived image quality.
2Area of stationary object
If the screen size is increased to provide large angular field of view, then field of view is improved, but pixel density requirement increases
Solution Approach 1:
The patent implements local quality by creating a display structure where pixel density varies across different regions. The high-definition display section concentrated in the center provides high pixel density for the central viewing area, while the overall large screen area maintains the wide angular field of view. This resolves the contradiction by optimizing pixel distribution to match human visual characteristics.
Solution Approach 2:
The patent segments the display region into distinct high-definition and low-definition sections. This segmentation allows the device to achieve both large overall screen area for wide field of view and high pixel density in specific regions for high definition, resolving the contradiction between screen size and pixel density requirements.
3Measurement precision
If high-definition display is implemented across the entire screen, then image quality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies local quality by implementing high-definition pixel structures only in the high-definition display section rather than uniformly across the entire screen. This reduces manufacturing complexity and cost by limiting the use of more complex high-density pixel structures to only the regions where high definition is most beneficial, while using simpler low-definition structures in peripheral areas.
Data Source
AI summary
A display device includes a low-definition display section and a high-definition display section. An area of pixels of the high-definition display section is smaller than an area of pixels of the low-definition display section. The position of the center of the high-definition display section is shifted from the position of the center of the display region. Consequently, when the display device is worn on the head of a user and disposed in front of the eyes, it is possible to provide a high-definition image. It is possible to reduce a processing load of moving image processing.