Dual-Lens VR Display with Spatial Filter for Screen Door Effect
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Solution Overview
Problem
Current virtual reality display technologies suffer from the 'Screen Door Effect' due to the close proximity of the display screen to the eyes, resulting in a black mesh pattern and loss of detail, especially for distant objects, which high resolution alone cannot fully eliminate.
Innovation Solution
A display device comprising a display panel, a first lens with a specific focal length, and a spatial filtering component, such as an adjustable diaphragm, combined with a second lens of different focal length, arranged at the light exit side to filter and process light rays, alleviating the 'Screen Door Effect' by selectively blocking high-frequency spatial frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display screen is placed close to the eyes to achieve stereoscopic display, then the field of view and immersion are improved, but the pixel granular sensation and screen door effect worsen
Solution Approach 1:
The patent divides the optical path into multiple segments with different optical functions. The first lens segment creates a virtual image at a specific distance, while the second lens segment further processes the light to control the final image distance and viewing angle. This segmentation allows the display to achieve both close proximity for immersion and proper image formation to reduce pixel visibility.
Solution Approach 2:
The patent introduces an intermediary optical system consisting of two lenses with different focal lengths between the display screen and the user's eyes. This intermediary system transforms the direct view of the screen into a controlled virtual image, mediating the contradiction between close proximity and pixel visibility by creating an intermediate virtual image plane.
2Manufacturing precision
If high resolution display is used to reduce pixel visibility, then the screen door effect is partially alleviated, but it cannot totally eliminate the phenomenon
Solution Approach 1:
The patent replaces the purely mechanical/electrical solution of increasing display resolution with an optical solution using lens systems. By substituting the direct high-resolution display approach with an optical transformation system, the patent achieves a more effective elimination of the screen door effect through optical image formation and distance control.
Solution Approach 2:
The patent changes the optical parameters of the light path by using two lenses with different focal lengths. The first lens has a focal length of 50-70mm and the second lens has a different focal length, creating specific image distances and viewing angles. This parameter change transforms the optical characteristics to reduce pixel visibility without relying solely on increasing display resolution.
3Device complexity
If a single lens is used in the optical system, then the device complexity is reduced, but the ability to control image distance and viewing angle is insufficient
Solution Approach 1:
The patent creates a dynamic optical system where the two lenses with different focal lengths work together to provide adjustable image distance and viewing angle control. The first lens creates a virtual image that serves as the object for the second lens, creating a dynamic optical path that can be optimized for different viewing conditions, providing adaptability without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the viewing experience in virtual reality by reducing the pixel granular sensation and enhancing overall picture clarity, effectively minimizing the 'Screen Door Effect' and providing a more immersive stereoscopic display.
Implementation Method 1
a first lens having a first focal length, a spatial filtering component configured for filtering and a second lens having a second focal length which are arranged in order at a light exit side of the display panel
Implementation Method 2
a spatial filtering component configured for filtering... filtering a light ray emitted from the display panel by adjusting the spatial filtering component
Implementation Method 3
a second lens having a second focal length which are arranged in order at a light exit side of the display panel... transmitting the light ray to the second lens
Data Source
AI summary
Embodiments of the present disclosure disclose a display device, a display method and a head-mounted virtual display helmet. The display device includes: a display panel; and a first lens having a first focal length, a spatial filtering component configured for filtering and a second lens having a second focal length which are arranged in order at a light exit side of the display panel, wherein the second focal length is different from the first focal length.