Color Filter Light Shielding Structure for High-Density LCD Pixels
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Solution Overview
Problem
Existing liquid crystal display (LCD) technologies face challenges in achieving high pixel density due to light absorption by RGB color films, material limitations, and issues with cross-color between pixels during dielectric film processing, leading to inefficiencies in light utilization and product resolution.
Innovation Solution
A color filter design featuring filter units with a light shielding layer on the third surface between adjacent units, utilizing a protective layer to prevent damage during processing and form a light shielding layer, thereby simplifying the preparation process and reducing light crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If RGB color films are used for color separation, then color display function is achieved, but light absorption increases and light utilization rate decreases
Solution Approach 1:
The patent changes the fundamental parameter of color separation from absorption-based (organic dye films) to interference-based (inorganic dielectric thin films). By adjusting film thickness and refractive index parameters, the dielectric films achieve wavelength-selective reflection without absorbing light, thereby improving light utilization while maintaining manufacturability through established PVD/CVD processes
Solution Approach 2:
The patent employs composite inorganic dielectric thin film structures consisting of multiple layers with different refractive indices (high refractive index layers and low refractive index layers). This composite structure enables precise control of optical interference effects to achieve color separation without light absorption, resolving the contradiction between energy efficiency and manufacturing complexity
2Manufacturing precision
If dielectric thin film filter is patterned to form R/G/B dielectric film, then pixel density can be improved, but cross-color between pixels occurs
Solution Approach 1:
The patent segments the color filter into independently patterned R/G/B dielectric film regions, each with its own optical cavity structure. This segmentation allows precise spatial control of color emission from each pixel without interference from adjacent pixels, achieving high pixel density while preventing cross-color contamination
Solution Approach 2:
The patent applies local quality by tailoring the thickness and refractive index of dielectric films specifically for each color region (R, G, B). Each pixel's dielectric film structure is locally optimized to reflect only its designated wavelength range, ensuring color purity and preventing cross-color effects even at high pixel densities
3Ease of manufacture
If laminated structure of R/G/B dielectric films is processed successively, then color filter functionality is achieved, but damage to previous layer occurs in subsequent processing
Solution Approach 1:
The patent applies preliminary action by forming a protective film layer before subsequent processing steps. This protective layer is deposited in advance to shield previously formed dielectric film layers from damage during etching, deposition, or other manufacturing processes, ensuring layer integrity while maintaining processing complexity at acceptable levels
Solution Approach 2:
The patent implements beforehand cushioning through the protective film that acts as a cushioning layer between processing steps. This protective film absorbs or mitigates potential damage to underlying sensitive dielectric layers during subsequent manufacturing operations, preserving the reliability of the laminated structure
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 light utilization and prevents damage to previously formed filter units, allowing for improved pixel density and reduced cross-color issues, thus increasing the energy efficiency and resolution of LCD products.
Implementation Method 1
Dielectric thin film filter is a kind of laminated film composed of two or more films with low refractive index and high refractive index by using the interference principle of light in medium
Data Source
AI summary
A color filter, a preparation method therefore, an array substrate and a display device are provided. The color filter includes a plurality of filter units (20) provided on a base substrate (10) for transmitting light of different colors, and a light shielding layer (30) located between adjacent filter units (20) for transmitting light of different colors. The filter unit (20) includes a first surface facing the base substrate (10), a second surface facing away from the base substrate, and a third surface connecting the first surface and the second surface. The light shielding layer (30) is provided on the third surface of at least one of two adjacent filter units (20) transmitting light of different colors.