Waveguide Grating Display Device for Near-Eye 3D Light Extraction
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Solution Overview
Problem
Current display technologies face challenges in achieving high-resolution, near-to-eye 3D displays with efficient light extraction and accurate gray scale regulation, particularly in implementing three-dimensional (3D) image display using light field technology.
Innovation Solution
A display device comprising a liquid crystal layer between two base substrates, a waveguide grating, and a collimation light source, where the refractive index of the liquid crystal layer is controlled using an electric field to regulate light output from the waveguide grating, enabling gray scale display by varying the refractive index difference between the liquid crystal layer and the grating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light field technology is used for 3D display, then three-dimensional image display capability is improved, but light extraction efficiency deteriorates
Solution Approach 1:
The patent changes the refractive index parameter of the liquid crystal layer by applying voltage to control the orientation of liquid crystal molecules. This parameter change enables dynamic adjustment of light extraction efficiency from the waveguide grating, resolving the contradiction between maintaining 3D display capability and improving light extraction efficiency.
2Ease of manufacture
If conventional display technologies are used, then manufacturing simplicity is maintained, but gray scale regulation accuracy deteriorates
Solution Approach 1:
The patent uses voltage-controlled refractive index changes in the liquid crystal layer to achieve precise gray scale regulation. By adjusting the applied voltage, the refractive index difference between the liquid crystal layer and waveguide grating can be precisely controlled, enabling accurate gray scale display while maintaining a relatively simple manufacturing process.
3Adaptability or versatility
If color filters are used in display panels, then color display is achieved, but light transmittance deteriorates
Solution Approach 1:
The patent uses waveguide gratings with different local structures to generate different colors through diffraction rather than using color filters. Each grating region has specific local quality (grating period, depth, or orientation) that determines the diffracted color, eliminating the need for color filters and improving light transmittance while maintaining color display capability.
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 solution allows for precise control of light extraction efficiency, enabling high-resolution near-to-eye 3D displays without the need for color filters and improving light transmittance, thus enhancing display panel transparency and utilization.
Implementation Method 1
the refractive index of the liquid crystal layer is controlled using an electric field to regulate light output from the waveguide grating
Implementation Method 2
a light emitted by the collimation light source is coupled into the waveguide layer and output from the grating layer
Implementation Method 3
the waveguide grating comprises a waveguide layer and a grating layer on a side of the waveguide layer which faces the liquid crystal layer
Data Source
AI summary
A display device and a display method thereof are provided. The display device includes: a first base substrate (10) and a second base substrate (20) which are arranged oppositely and a liquid crystal layer (30) between the first base substrate (10) and the second base substrate (20), the display device further includes: a waveguide grating (40) between the liquid crystal layer (30) and the first base substrate (10), the waveguide grating (40) including a waveguide layer (401) and a grating layer (402) on one side of the waveguide layer (401) facing the liquid crystal layer (30), and the grating layer (402) being in contact with the liquid crystal layer (30); and a collimation light source (50) on a lateral surface of the waveguide layer (401), light emitted by the collimation light source (50) being coupled into the waveguide layer (401) and output from the grating layer (402). The display device can regulate an amount of the light output from the waveguide grating by controlling changes of the refractive index of the liquid crystal layer so as to implement gray scale display.