Color Filter Substrate Light Anti-Reflection Layer Optical Loss
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Solution Overview
Problem
Liquid crystal display (LCD) systems using white light emitting diodes and RGB color filters suffer from significant light loss due to refractive index differences, leading to decreased light transmission rates and limited color gamut.
Innovation Solution
A color filter substrate with a light anti-reflection layer arranged on the base substrate or on the light emergent side of color filter units, designed to increase light transmission rates by utilizing thin film anti-reflection principles, where the thickness of the anti-reflection layer corresponds to specific wavelengths of red, green, and blue light, enhancing the transmission of corresponding colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white light LED backlight coordinates with RGB color filter to realize pixel coloring, then the display device can achieve color display function, but light transmission rate decreases due to optical loss at interfaces
Solution Approach 1:
The patent introduces a light anti-reflection layer as an intermediary substance between the color filter units and the base substrate (or between the color filter units and the external environment). This intermediate layer has specific optical properties that mediate the light transmission, reducing reflection losses at the interfaces. The anti-reflection layer acts as a buffer that optimizes the optical coupling between different media with different refractive indices, thereby increasing the light transmission rate and reducing optical loss.
Solution Approach 2:
The patent applies parameter changes by controlling the thickness of the light anti-reflection layer to be nλ/4 (where n is an odd number and λ is the wavelength of light). By changing the physical parameter of layer thickness to match specific optical wavelength conditions, the anti-reflection layer creates destructive interference for reflected light and constructive interference for transmitted light. This parameter optimization directly addresses the optical loss problem by minimizing reflection at specific wavelengths corresponding to the color filter transmission bands.
2Ease of manufacture
If light transmits through color filter with refractive index difference between photo resist and glass, then color filtering is achieved, but light reflection occurs at interfaces causing optical loss
Solution Approach 1:
The light anti-reflection layer serves as an intermediary between the photo resist color filter and the glass base substrate. This intermediate layer has optical properties that are intermediate between the two materials, creating a gradual transition in refractive index. This reduces the abrupt refractive index difference that causes reflection, thereby minimizing optical loss while preserving the color filtering function of the photo resist layer.
Solution Approach 2:
The patent employs composite material structure by combining the color filter layer (photo resist), the anti-reflection layer, and the base substrate (glass) into a multi-layer composite system. Each layer has specific optical properties optimized for its function: the color filter layer provides spectral selection, while the anti-reflection layer provides impedance matching for light transmission. This composite structure allows simultaneous achievement of color filtering and reduced reflection loss.
3Adaptability or versatility
If light transmits through color filter, then color selection is achieved, but selectivity is comparatively low which decreases color gamut
Solution Approach 1:
The patent optimizes the thickness parameter of the anti-reflection layer to nλ/4, where λ corresponds to the peak transmission wavelength of each color filter. This parameter optimization enhances the transmission efficiency at the desired wavelengths by minimizing reflection losses. By improving the transmission rate at the color filter's passband wavelengths, the effective color selectivity is enhanced, and the color gamut is expanded because more of the filtered light reaches the viewer without being lost to reflection.
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 implementation of the light anti-reflection layer significantly increases the light transmission rate and color gamut of the display device by minimizing optical losses and improving color selectivity.
Implementation Method 1
a light anti-reflection layer arranged on the base substrate and on a light emergent side of the color filter units, the light anti-reflection layer being capable of increasing a light transmission rate
Implementation Method 2
Because there is a refractive index difference between photo resist and glass, when light transmits through an interface between the two, partial light will be reflected
Implementation Method 3
a thickness of the light anti-reflection layer is relevant to a wavelength of color light corresponding to at least one color filter unit
Data Source
AI summary
A color filter substrate and a manufacturing method thereof, and a display device are disclosed. The color filter substrate includes: a base substrate, a plurality of color filter units of different colors arranged on a side of the base substrate, and a light anti-reflection layer arranged on the base substrate and on a light emergent side of the color filter units. The light anti-reflection layer is capable of increasing a light transmission rate of at least one color filter unit. The effect of improving the light transmission rate can be realized.