Slit Grating Wire Grid Polarization Light Recycling
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Solution Overview
Problem
Autostereoscopic 3D displays using grating technology suffer from significant brightness loss due to light-shielding regions, which also decrease 2D image brightness in switchable displays.
Innovation Solution
A slit grating with light-shielding strips and a wire grid in the transmitting regions is used, where the wire grid transmits one polarized component and reflects another, allowing for light recycling, thereby enhancing display brightness without the need for brightness enhancement films or lower polarizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grating technology is used to achieve autostereoscopic 3D display, then image crosstalk among different views is effectively avoided, but brightness of the display is significantly reduced due to light shielding
Solution Approach 1:
The patent changes the optical parameters of the grating structure by introducing wire grids with specific polarization properties. The wire grids are designed to transmit one polarization component while reflecting another, transforming the grating from a purely light-shielding structure to a polarization-selective structure that preserves useful light
Solution Approach 2:
The patent creates a composite grating structure combining light-shielding strips with wire grids. This composite structure integrates the light-shielding function with the light-transmitting and polarization-selective function of the wire grids, allowing simultaneous achievement of crosstalk prevention and brightness maintenance
2Illumination intensity
If brightness enhancement film and lower polarizer are added to compensate for brightness loss, then display brightness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The wire grid in the patent performs multiple functions simultaneously: it acts as a polarization selector, a light reflector, and a structural component of the grating. This multi-functionality eliminates the need for separate brightness enhancement films and lower polarizers, reducing device complexity while maintaining brightness
Solution Approach 2:
The patent merges the functions of the wire grid with what would traditionally require separate components (brightness enhancement film and lower polarizer). The wire grid is integrated directly into the grating structure, combining light management functions into a single element and simplifying the overall device architecture
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 improves display brightness, reduces costs, and minimizes thickness by effectively recycling light and eliminating the need for additional optical components.
Implementation Method 1
the wire grid is used to transmitting a first polarized component of the incident light and then reflecting a second polarized component of the incident light; wherein, the second polarized component is perpendicular to the first polarized component
Implementation Method 2
the light-shielding strips further reflect the incident light
Data Source
AI summary
The present disclosure is to provide a slit grating applied in autostereoscopic display apparatus and autostereoscopic display apparatus. The slit grating includes a substrate and a plurality of light-shielding strips arranged in intervals on the substrate; the light-shielding strips is used to shielding incident light; the slit grating further includes a wire grid among a light-transmitting region between the light-shielding strips, and the wire grid is used to transmitting a first polarized component of the incident light and reflecting a second polarized component that is perpendicular to the first polarized component of the incident light. The autostereoscopic display apparatus includes a backlight module, a liquid crystal display and the slit grating. The present disclosure can improve brightness of display device, and achieve cost decreasing and thickness reducing at the same time.