Display Border Reflectance Reduction via Refractive Index Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic device displays with opaque masking borders often suffer from excessive reflectance and unwanted color issues due to discontinuities in the indices of refraction, affecting their appearance and usability.
Innovation Solution
The implementation of a transparent conductive layer and index-of-refraction matching layers, combined with an opaque masking layer containing carbon black and titanium oxide particles, is used to reduce reflectance and adjust color in the inactive border area, with the matching layers interposed between the masking layer and the display to minimize reflections and achieve a desired color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an opaque masking layer with carbon black particles is used in the inactive border area, then the display can hide internal components effectively, but the reflectance increases and color appearance deteriorates
Solution Approach 1:
The patent changes the physical parameters of the masking layer by adjusting particle size (using larger particles) and index of refraction (matching to surrounding materials). This reduces reflectance while maintaining the opaque masking function, resolving the contradiction between hiding components and minimizing reflections.
Solution Approach 2:
The patent uses a composite masking layer combining carbon black particles with binder materials having specific refractive indices. This composite structure maintains the light-blocking function while controlling reflectance through refractive index matching, addressing both the masking and reflectance issues.
2Object-generated harmful factors
If carbon black particles are used to create a dark opaque masking layer, then internal components are hidden, but the color becomes unwanted and non-matching
Solution Approach 1:
The patent adjusts the refractive index parameter of the masking layer material to match surrounding display materials. This color matching approach maintains the dark appearance needed for component hiding while achieving visual harmony with the active display area, resolving the color matching issue.
3Object-generated harmful factors
If the opaque masking layer has high opacity to hide components, then internal structures are concealed, but light reflections increase
Solution Approach 1:
The patent changes the index of refraction parameter of the masking layer to match adjacent materials, which reduces light reflections at interfaces. Simultaneously, the layer maintains sufficient opacity through appropriate particle selection, resolving both the reflection and masking requirements.
Solution Approach 2:
The patent introduces an intermediary layer with intermediate refractive index between the opaque masking layer and surrounding materials. This intermediary layer acts as a transition that reduces reflections while allowing the masking layer to maintain its light-blocking function.
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 reduces reflectance and stabilizes the color of the opaque masking layer, enhancing the appearance and usability of electronic device displays by minimizing light reflections and matching the color with the active display area.
Implementation Method 1
The opaque masking layer may include particles such as carbon black particles to provide the opaque masking layer with a dark appearance
Implementation Method 2
Index-of-refraction matching layers may be interposed between the transparent conductive layer and the transparent display layer
Implementation Method 3
The color of the opaque masking layer may be adjusted by incorporating additional particles such as titanium oxide particles
Implementation Method 4
Particle size for the carbon black particles and the index of refraction of the opaque masking layer may be adjusted to reduce reflectance
Data Source
AI summary
A display may have an active area in which pixels display images through a transparent display layer. An opaque masking material may be formed in an inactive border area adjacent to the active area. The opaque masking layer may include particles such as carbon black particles to provide the opaque masking layer with a dark appearance. The color of the opaque masking layer may be adjusted by incorporating additional particles such as titanium oxide particles. Particle size for the carbon black particles and the index of refraction of the opaque masking layer may be adjusted to reduce reflectance in the inactive border area. A transparent conductive layer may be supported by the transparent display layer. Index-of-refraction matching layers may be interposed between the transparent conductive layer and the transparent display layer. The opaque masking layer may be interposed between the matching layers in the inactive border area.