Color Filter Substrate Using Photonic Crystal and Waveguide Grating
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Solution Overview
Problem
Liquid Crystal Display (LCD) panels face low transmittance due to the absorption of white light by color filter components, which filters light into only one color, resulting in inefficient color rendering and display performance.
Innovation Solution
A color filter substrate with a photonic crystal layer and arrayed waveguide grating layer is used, featuring alternating color resistance areas and gratings of different angles to control light incidence, allowing for improved light transmission and color separation without additional light loss, and a wave separating layer to enhance transmission and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional color filter components are used to filter white light into three colors, then color separation is achieved, but transmittance is reduced due to light absorption by the filter components
Solution Approach 1:
The patent changes the working principle of color filtering from absorption-based to diffraction-based. By using arrayed waveguide gratings with specific grating equations and periodic structures, light is separated by wavelength through diffraction rather than absorption, fundamentally changing the parameter of light-matter interaction from absorptive to diffractive
Solution Approach 2:
The patent replaces the traditional absorptive color filter mechanism with a diffractive optical system. Instead of using materials that absorb specific wavelengths, the system uses waveguide gratings that physically diffract light based on the grating equation, substituting an absorptive mechanism with a diffractive one
2Measurement precision
If color filter components absorb majority of white light to transmit only one color, then color purity is improved, but overall light transmission is reduced
Solution Approach 1:
The patent changes the color separation mechanism from absorption to diffraction. The arrayed waveguide gratings use the grating equation to separate wavelengths, and the photonic crystal layer with its periodic structure modifies the dispersion characteristics, achieving color purity through constructive and destructive interference rather than absorption
Solution Approach 2:
The patent introduces angular dimension to color separation. By using arrayed waveguide gratings that diffract light at different angles for different wavelengths, and combining this with a photonic crystal layer that modifies dispersion, the system achieves color separation in the angular domain rather than just through wavelength filtering
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 enhances transmittance and display performance by controlling light angles and colors, enabling efficient light transmission and improved resolution without additional light consumption, thus addressing the low transmittance issue in LCD panels.
Implementation Method 1
a photonic crystal layer formed on a side of the base substrate, wherein color resistance areas corresponding to sub-pixel elements in a one-to-one manner are arranged at the photonic crystal layer, and color resistance areas in different colors are arranged alternately so that there is a one-dimensional complex-periodic photonic crystal structure
Implementation Method 2
there is a one-dimensional complex-periodic photonic crystal structure of the photonic crystal layer
Implementation Method 3
an arrayed waveguide grating layer arranged on a side of the photonic crystal layer facing away from the base substrate, wherein there are different angles of gratings at the arrayed waveguide grating layer to control output light rays to be irradiated onto different color resistance areas
Implementation Method 4
a wave separating layer formed on a side of the arrayed waveguide grating layer facing away from the base substrate
Data Source
AI summary
The disclosure discloses a color filter substrate, a method for fabricating the same, and a liquid crystal display panel, the color filter substrate includes: a base substrate; a photonic crystal layer formed on a side of the base substrate, wherein color resistance areas corresponding to sub-pixel elements in a one-to-one manner are arranged at the photonic crystal layer and color resistance areas in different colors are arranged alternately; an arrayed waveguide grating layer arranged on a side of the photonic crystal layer facing away from the base substrate, wherein there are different angles of gratings at the arrayed waveguide grating layer to control output light rays to be irradiated onto different color resistance areas of the photonic crystal layer at different incident angles; and a wave separating layer formed on a side of the arrayed waveguide grating layer facing away from the base substrate.