Peripheral Color Filter for Display Border Reflection Reduction
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Solution Overview
Problem
Traditional liquid crystal displays face challenges in minimizing reflections in the inactive peripheral region due to differences in refractive indices between the glass layer, color filter elements, and black masking layers, making it difficult to reduce contrast between the active and inactive areas.
Innovation Solution
A peripheral color filter ring formed from a single color photoresist, such as blue, is interposed between the opaque masking layer and the transparent rigid layer in the inactive border region, covering the surface of the inactive area to reduce reflections by matching the refractive indices and creating a seamless appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional display designs are used with glass layer, color filter elements, and black masking layers, then the display can be manufactured with standard materials, but reflections arise at the interfaces due to differences in refractive indices making the inactive peripheral region stand out in contrast
Solution Approach 1:
The patent applies local quality by introducing a peripheral color filter specifically in the inactive border region, which has different optical properties (refractive index) than the standard color filter elements in the active region. This localized modification matches the refractive index of the black masking layer in the peripheral area, reducing reflections at the interface without affecting the active display region.
Solution Approach 2:
The patent changes the optical parameter (refractive index) of the color filter material in the inactive peripheral region by using a different material composition or formulation. This parameter change allows the peripheral color filter to match the refractive index of adjacent layers (glass and black masking layer), thereby minimizing reflections at the interfaces in the border region.
2Device complexity
If the inactive peripheral region is left with standard materials, then the manufacturing process remains simple, but the contrast between active and inactive portions is high due to visible reflections
Solution Approach 1:
The patent introduces a peripheral color filter specifically in the inactive border region with different optical properties from the standard color filter elements. This localized modification reduces the visual contrast between active and inactive regions by matching refractive indices, without significantly increasing overall device complexity.
Solution Approach 2:
The patent applies the color filter material excessively in the inactive region, covering the entire peripheral area rather than just specific zones. This partial application (only in inactive region) is sufficient to reduce reflections and visual contrast without requiring modification of the entire display 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
This configuration effectively minimizes reflections in the inactive border region, providing a seamless display appearance by matching the refractive indices of the black masking material and color filter elements, thus enhancing the visual integrity of the display.
Implementation Method 1
reflections are caused by differences in the indices of refraction of the glass layer, the color filter elements and the black masking layer
Data Source
AI summary
An electronic device may have a display such as a liquid crystal display. A color filter layer may be formed on a display layer such as a transparent substrate layer. The color filter layer may include an array of color filter elements on a central portion of a surface of the transparent substrate layer. The color filter layer may include a peripheral color filter of a single color that at least partially surrounds the color filter elements on the central portion of the inner surface. In an inactive portion of the display, an opaque masking material may be formed over the peripheral color filter. In an active portion of the display the opaque masking material may form a grid that covers interfaces between adjacent color filter elements. The peripheral color filter may completely cover the surface of the substrate in the entire inactive portion of the display.