Color Filter Refractive Index Matching for Low-Reflection Displays
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Solution Overview
Problem
Current display devices suffer from poor anti-reflection effects and decreased contrast due to strong ambient light, as the reflectivity of different regions cannot be locally improved, leading to vision interference.
Innovation Solution
Incorporation of a refractive index-matching layer between the substrate and the color filter layer, with specific regions of the layer having different refractive indices to match those of the substrate, light shielding unit, and color filter units, thereby reducing surface reflectivity and enhancing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional display device structure is used, then the device can function normally, but strong reflected light causes vision interference and contrast decrease when used outdoors
Solution Approach 1:
The patent applies local quality by creating a refractive index-matching layer with specific optical properties only in the region where the light shielding unit and color filter units are located. This layer has a refractive index between 1.52 and 1.75, which is specifically optimized to reduce reflected light from these particular components, rather than attempting to modify the entire display surface uniformly.
Solution Approach 2:
The refractive index-matching layer acts as an intermediary between the substrate and the color filter layer. This intermediate layer with its specific refractive index (1.52-1.75) serves as an optical mediator that reduces the reflection at the interface between the substrate and color filter layer, thereby reducing harmful reflected light while maintaining the functional integrity of the display device.
2Object-affected harmful factors
If the reflectivity of different regions cannot be locally improved, then the device structure remains simple, but the anti-reflection effect is poor and contrast is affected
Solution Approach 1:
The patent segments the refractive index-matching layer into a patterned structure with openings that align with the light shielding unit and color filter units. This segmentation allows the anti-reflection function to be applied specifically to the regions where reflected light causes problems, while leaving other areas of the display unaffected. The segmented pattern matches the underlying color filter unit arrangement, enabling localized optical optimization.
Solution Approach 2:
The refractive index-matching layer is designed with spatially varying properties through its patterned opening structure. The regions with the matching layer material provide optical interference to reduce reflectivity, while the opening regions allow light to pass through to the color filter units. This local differentiation of optical properties enables targeted anti-reflection where needed without uniformly complicating the entire device 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 effectively reduces surface reflectivity and improves contrast by matching refractive indices, addressing the issues of vision interference and contrast decrease in display devices under strong ambient light conditions.
Implementation Method 1
a first refractive index-matching layer disposed between the substrate and the color filter layer, wherein the first refractive index-matching layer comprises an opening, and the opening and at least one of the light shielding unit, the first color filter unit, the second color filter unit and the third color filter unit are overlapped in a top view of the substrate
Data Source
AI summary
An electronic device includes: a substrate; a color filter layer disposed on the substrate, wherein the color filter layer includes a light shielding unit and a plurality of color filter units adjacent to the light shielding unit, and the plurality of color filter units includes a first color filter unit, a second color filter unit and a third color filter unit; and a first refractive index-matching layer disposed between the substrate and the color filter layer, wherein the first refractive index-matching layer comprises an opening, and the opening and at least one of the light shielding unit, the first color filter unit, the second color filter unit and the third color filter unit are overlapped in a top view of the substrate.