Anisotropic Grating Liquid Crystal Display Light Efficiency
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Solution Overview
Problem
Conventional liquid crystal display apparatuses require high energy to achieve a certain brightness level due to the use of color filters, which result in significant light loss and inefficiency.
Innovation Solution
A liquid crystal display apparatus featuring an anisotropic grating with alternating barriers and slits, separating incident light into red, green, and blue colors and emitting them at different angles, eliminating the need for a color filter and optimizing light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used to separate light into different colors, then color display is achieved, but significant light loss occurs and high energy consumption is required
Solution Approach 1:
The patent replaces the mechanical color filter system with an optical grating system that uses diffraction and interference effects to separate light into different colors. The anisotropic grating structure with alternating high and low refractive index regions directs different wavelengths of light at different angles, eliminating the need for absorptive color filters and significantly reducing light loss.
Solution Approach 2:
The patent changes the optical parameters of the light guide plate by incorporating an anisotropic grating structure with spatially varying refractive indices. This allows the system to manipulate light propagation based on wavelength, separating colors through angular dispersion rather than absorption, thereby improving light efficiency while maintaining color display capability.
2Illumination intensity
If color filters are used to achieve color separation, then color display is possible, but light transmission efficiency decreases
Solution Approach 1:
The patent substitutes the color filter mechanism with a diffraction-based optical grating system. The anisotropic grating in the light guide plate separates incident white light into different color components by directing them at different exit angles, achieving color separation without absorbing light, thus maintaining high transmission efficiency.
Solution Approach 2:
The patent introduces an anisotropic grating structure as an intermediary element within the light guide plate. This grating acts as a mediator that separates light into different color paths before the light reaches the liquid crystal layer, enabling color display while preserving light transmission efficiency by avoiding direct absorption by color filters.
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 reduces light loss and energy requirements by separating and directing light colors efficiently, enhancing brightness without the need for color filters, thereby improving display efficiency.
Implementation Method 1
the anisotropic grating is configured to selectively diffract the transverse magnetic component of the incident light into the liquid crystal layer
Implementation Method 2
the anisotropic optical material has a first refractive index for a transverse magnetic component of the incident light and a second refractive index for a transverse electric component of the incident light
Implementation Method 3
the anisotropic grating is configured to selectively block the transverse electric component of the incident light from entering into the liquid crystal layer
Data Source
AI summary
The present application discloses a liquid crystal display apparatus and a fabricating method thereof, a back light and a fabricating method thereof. The liquid crystal display apparatus includes a base substrate; a liquid crystal layer; and an anisotropic grating on a side of the liquid crystal layer distal to the base substrate. The anisotropic grating includes a plurality of barriers and a plurality of slits arranged alternately. The anisotropic grating is configured to separate incident light into light of a first color, light of a second color, and light of a third color, and configured to emit the light of the first color, the light of the second color, and the light of the third color at different exit angles, respectively.