Naked-eye Stereoscopic Display Grating Light Recycling
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Solution Overview
Problem
Traditional naked-eye stereoscopic display devices face significant brightness loss due to the grating layer and have limitations in thickness, leading to issues with brightness and color crosstalk caused by environment light reflection.
Innovation Solution
A naked-eye stereoscopic display grating with a transparent and reflective region, where a metal grating layer with high reflectivity is used to reflect light back to the backlight system, and a metal oxide layer with low reflectivity is used to minimize color crosstalk and contrast ratio problems by reducing reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional absorption type polarized sheet is used in the grating layer, then the device structure is simple, but the thickness is about 100 μm which limits the development of naked-eye stereoscopic technology and causes significant brightness loss
Solution Approach 1:
The patent changes the optical properties of the grating layer by using a reflective metal grating layer instead of an absorption type polarized sheet. This parameter change transforms the light interaction mechanism from absorption to reflection, enabling light to be reflected back to the backlight system for reuse, thereby significantly reducing brightness loss while maintaining structural simplicity
Solution Approach 2:
The patent converts the harmful effect of light loss into a beneficial effect by using the reflective metal grating layer to reflect lost light back to the backlight system. The light that would otherwise be wasted is now reused, turning a negative factor (brightness loss) into a positive factor (increased light usage efficiency)
2Use of energy by moving object
If a metal grating layer with high reflectivity is used to reflect light back to the backlight system, then light usage efficiency increases, but environment light reflected by the metal grating layer causes color crosstalk and low contrast ratio problems
Solution Approach 1:
The patent applies local quality by creating alternating transparent regions and reflective regions in the grating layer. The reflective regions use high reflectivity metal grating to reflect light back to the backlight system, while the transparent regions allow light to pass through. This local differentiation enables the system to achieve high light usage efficiency in reflective areas while maintaining good contrast and avoiding color crosstalk in transparent areas
Solution Approach 2:
The patent segments the grating layer into multiple regions with different optical properties - transparent regions and reflective regions arranged periodically. This segmentation allows different parts of the display to serve different functions: transparent regions for normal light transmission and reflective regions for light recycling, thereby resolving the contradiction between light efficiency and image quality
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 increases light usage efficiency, enhances brightness, and reduces color crosstalk and contrast ratio issues by recycling light through the metal grating layer while minimizing reflections with the metal oxide layer.
Implementation Method 1
a metal grating layer with high reflectivity is used to reflect light back to the backlight system
Implementation Method 2
a metal oxide layer with low reflectivity is used to minimize color crosstalk and contrast ratio problems by reducing reflected light
Data Source
AI summary
A naked-eye stereoscopic display grating, manufacturing method and display device are disclosed. The method includes: preparing a transparent substrate; depositing a metal oxide layer on the transparent substrate; depositing a metal grating layer on the metal oxide layer, wherein, a reflectivity of the metal oxide layer is less than a reflectivity of the metal grating layer; and adopting a photolithography method to etch the metal oxide layer and the metal grating layer in order to expose a portion of the transparent substrate to form a transparent region and a reflective region arranged periodically. Accordingly, the present invention can increase the usage efficiency of the light, decrease a color crosstalk problem and low contrast ratio problem caused by an environment light reflected by the metal grating layer and the light in the panel.