VR Display Sub-Gratings for Light Ray Utilization
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Solution Overview
Problem
Virtual reality glasses have low light ray utilization due to the inefficient propagation of light rays from sub-pixels, with only a small portion reaching the user's eyes.
Innovation Solution
A display device with an array substrate featuring sub-gratings of different structures that adjust the propagation direction of light rays, ensuring they converge towards the user's eyes, thereby increasing light ray utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light rays are emitted from sub-pixels in conventional display devices, then light rays propagate in different directions, but only a small portion reaches the user's eyes, causing low light ray utilization
Solution Approach 1:
The grating is divided into multiple sub-gratings, each corresponding to a specific preset area on the array substrate. Each sub-grating independently adjusts the light rays from its corresponding sub-pixels, segmenting the light control function to achieve precise directional adjustment and improve light ray utilization.
Solution Approach 2:
Different sub-gratings are designed with different structures according to their respective preset areas. This local differentiation allows each sub-grating to optimally direct light rays from its corresponding sub-pixels toward the user's eyes, improving overall light utilization while maintaining ease of operation through localized optimization.
2Loss of energy
If sub-gratings with different structures are used to converge light rays to predetermined spatial positions, then light ray utilization increases, but device complexity increases
Solution Approach 1:
Multiple sub-gratings with different structures are integrated onto a single array substrate, merging their functions to collectively converge light rays from all sub-pixels to predetermined spatial positions. This consolidation achieves improved light ray utilization while managing device complexity through integrated design.
Solution Approach 2:
The grating structure serves multiple functions: it segments light from different sub-pixels, adjusts propagation directions independently for each sub-grating, and converges all light rays to predetermined spatial positions. This multi-functionality improves light ray utilization while the integrated design keeps device complexity manageable.
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
The solution effectively enhances the amount of light rays emitted from sub-pixels into predetermined spatial positions, such as the user's eyes, improving light ray utilization and providing a more immersive experience.
Implementation Method 1
The grating comprises a plurality of sub-gratings having different structures. Each sub-grating comprises an adjusting part for adjusting propagation direction of light rays, and light rays exiting from the adjusting part converge to a predetermined spatial position.
Implementation Method 2
The light rays emitted from the light source are parallel light, and the light rays are totally reflected in the array substrate except in regions where adjusting parts of sub-gratings are located.
Data Source
AI summary
Embodiments of the present disclosure provide a display device and virtual reality glasses. The display device comprises an array substrate, which comprises a base substrate, a plurality of sub-pixels arranged on the base substrate, and a grating arranged on the base substrate. The grating comprises a plurality of sub-gratings having different structures, and each sub-grating comprises an adjusting part for adjusting propagation direction of light rays, so that light rays exiting from the adjusting part converge to a predetermined spatial position. The array substrate further comprises a plurality of preset areas, and the plurality of sub-gratings correspond to sub-pixels located in different preset areas respectively. The display device further comprises a light source disposed beside the base substrate. The light rays emitted from the light source are parallel light. The light rays are totally reflected in the array substrate except in regions where the adjusting parts of sub-gratings are located.