Grating Layer Period Variation for Near-Eye Display Light Control
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Solution Overview
Problem
Current display devices, particularly near eye displays, struggle to effectively control light propagation using structures based on geometrical optics, leading to a decline in on-the-spot effect and viewer immersion.
Innovation Solution
Incorporating a grating layer with varying grating periods in a display device to control light propagation, utilizing principles of physical optics, ensuring that light emitted from different pixel colors is directed accurately to the viewer's eyes, enhancing the display's on-the-spot effect and immersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If structures based on geometrical optics principles are used to control light propagation, then the device complexity is reduced, but the light control precision and viewing experience deteriorate
Solution Approach 1:
The patent changes the fundamental optical parameter approach from geometrical optics to physical optics principles. By introducing a grating layer with specific periodic structures, the system utilizes diffraction effects to control light propagation, achieving precise directional control of light from different pixel colors to respective eyes while maintaining reasonable device complexity
Solution Approach 2:
The patent substitutes geometrical optics-based light control structures with physical optics-based diffraction gratings. This replacement enables more precise light manipulation through wave optics phenomena, improving the ability to direct light from different colored pixels to the correct eyes while enhancing viewing experience
2Manufacturing precision
If microprisms or microlenses are used to control light propagation, then the light direction control is improved, but the viewing angle and field of view are limited
Solution Approach 1:
The patent applies local quality by creating different grating regions with varying grating periods tailored to specific viewing zones. The first grating region has a first grating period for directing light to the first eye, while the second grating region has a second grating period for directing light to the second eye, enabling precise directional control adapted to different viewing positions and angles
Solution Approach 2:
The patent introduces a new dimension of control by using diffraction grating periods as the controlling parameter instead of relying solely on microlens curvature or microprism geometry. By varying the grating period spatially across different regions, the system achieves broader viewing angles and enhanced field of view while maintaining precise light direction control
3Manufacturing precision
If a grating layer with varying grating periods is introduced, then the light control precision is improved, but the device complexity increases
Solution Approach 1:
The patent segments the grating layer into distinct first and second grating regions, each with specific grating periods optimized for directing light to respective eyes. This segmentation enables precise light control for stereoscopic viewing while maintaining manageable device complexity through modular regional design rather than requiring continuous complex variations throughout the entire structure
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 significantly improves light control within the display device, enhancing the viewer's experience by providing a more real and comfortable viewing experience with better light distribution and immersion.
Implementation Method 1
a grating layer arranged inside or outside of the display panel... utilizing principles of physical optics... control light propagation
Data Source
AI summary
A display device comprises a display panel and a grating layer. From a center of a left-eye field-of-view central area of a left display area to a non left-eye field-of-view central area of the left display area, a grating period of a left-eye grating region of a first color, a grating period of a left-eye grating region of a second color, and a grating period of a left-eye grating region of a third color all decrease gradually. From a center of a right-eye field-of-view central area of a right display area to a non right-eye field-of-view central area of the right display area, a grating period of a right-eye grating region of the first color, a grating period of a right-eye grating region of the second color, and a grating period of a right-eye grating region of the third color all decrease gradually.