Bendable Display Low-Reflection Structure for Uniform Reflectance
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Solution Overview
Problem
Bendable display devices experience reduced display quality due to significant differences in light reflectance between intimate-contact and non-intimate-contact portions, leading to non-uniform lighting and degraded visual experience.
Innovation Solution
A display device design featuring a bendable portion with variable relative positions of first and second low-reflection layers, incorporating asperity patterns and moth-eye structures on the surfaces of these layers, ensuring a consistent light reflectance across the display surface by aligning the asperity pattern pitch with pixel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is formed between the display device body and the cover member to avoid break during bending, then reliability is improved, but light reflectance uniformity deteriorates
Solution Approach 1:
The invention applies different surface structures (asperity patterns and moth-eye structures) to different regions of the low-reflection layers. The asperity patterns are formed with specific pitch relationships to pixel widths, and moth-eye structures are added in regions where gaps occur during bending. This local differentiation allows the surface to maintain low reflectance both in contact and non-contact regions, resolving the uniformity issue while preserving the gap structure for reliability.
Solution Approach 2:
The invention changes the physical parameters of the surface structures by controlling the pitch of asperity patterns to be equal to or less than the pixel width, and by forming moth-eye structures with specific depth and diameter ratios. These parameter optimizations ensure that the surface maintains anti-reflective properties across varying gap conditions, addressing both reliability and display uniformity requirements.
2Illumination intensity
If intimate contact between display device body and cover member is maintained, then light reflectance uniformity is improved, but reliability during bending deteriorates
Solution Approach 1:
The invention creates different surface characteristics in different regions: asperity patterns are formed across the entire surface with pitch ≤ pixel width, while moth-eye structures are specifically added in non-contact regions. This localized structural differentiation ensures that contact regions maintain their optical properties through asperity patterns alone, while non-contact regions benefit from both asperity and moth-eye structures to achieve uniform low reflectance.
Solution Approach 2:
The invention segments the low-reflection layer into multiple functional zones with different surface structures. The asperity patterns provide baseline anti-reflective functionality across all regions, while moth-eye structures are segmented to specifically address the optical issues in gap regions. This segmentation allows each zone to be optimized for its specific operational condition.
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 achieves high display quality by minimizing the difference in light reflectance between contact and non-contact areas, resulting in uniform lighting and improved visual experience.
Implementation Method 1
a main low-reflection structure has, on a surface facing a secondary low-reflection structure, a first asperity pattern and a first moth-eye structure provided on a surface of the first asperity pattern
Implementation Method 2
first low-reflection layer constituting the display surface; and a cover member covering the display surface, and having a second low-reflection layer facing the first low-reflection layer
Data Source
AI summary
The relative positions of a first low-reflection layer and a second low-reflection layer are variable in a bendable portion. A main low-reflection structure has, on a surface facing a secondary low-reflection structure, an asperity pattern and a moth-eye structure. The asperity pattern has a sine-wave shaped surface in a sectional view. A single period of a sine wave constituting the sine-wave shaped surface is equal to an integral multiple of the width of a single pixel of a display device in a direction where the asperity pattern is arranged.