Substrate Edge Structure for Display Light Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with narrow bezels experience light leakage at their edges due to the reflection and refraction of light, which is not effectively addressed by current technologies.
Innovation Solution
The display device incorporates a first substrate with a vertical and inclined portion on its sides, where the inclined portion has an angle greater than 90 degrees and less than 180 degrees with the lower surface, and a rougher surface than the vertical portion, to guide light away from the display surface, reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel width is reduced to achieve large screens and narrow borders, then the display area and modern design are improved, but light leakage at the edges occurs due to reflection and refraction
Solution Approach 1:
The patent applies local quality by creating a specific rough surface structure only at the edge region of the substrate, while maintaining smooth surfaces in the display area. This localized treatment targets the light leakage problem at edges without affecting the overall display quality. The roughness parameter is specifically controlled in the edge region to scatter light effectively.
Solution Approach 2:
The patent employs curvature by forming a convex curved surface at the edge of the substrate. This curved structure with a specific radius of curvature helps to redirect light paths and reduce edge light leakage. The combination of curvature and roughness creates an effective optical structure that addresses the light leakage issue while maintaining the narrow bezel design.
2Object-generated harmful factors
If a rough surface is applied to reduce light leakage, then light scattering is improved, but the manufacturing precision and surface uniformity may be compromised
Solution Approach 1:
The patent precisely controls where the rough surface is formed, limiting it to a specific edge region with defined dimensions. The roughness is quantified with specific parameters (Ra value range) to ensure manufacturing precision. This localized approach maintains surface uniformity in the display area while achieving light leakage reduction at edges through controlled roughness.
Solution Approach 2:
The patent specifies precise parameter ranges for the rough surface, including arithmetic mean roughness (Ra) between 0.1-10 μm and specific edge region dimensions. These controlled parameters ensure that the rough surface effectively scatters light while maintaining manufacturability and surface uniformity in other areas. The curvature radius is also controlled within specific ranges to balance optical performance and manufacturing feasibility.
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 design effectively reduces light leakage by guiding light emitted from the substrate in a direction away from the display surface, improving the visibility and reducing the occurrence of light leakage observed by the observer.
Implementation Method 1
light leakage by guiding light emitted from the substrate in a direction away from the display surface
Implementation Method 2
light leakage by guiding light emitted from the substrate in a direction away from the display surface
Data Source
AI summary
A display device is provided, including a substrates, a circuit board, and a plurality of wires. The substrates has an upper surface, a lower surface opposite to the upper surface, and a first side connecting the upper surface and the lower surface. The circuit board is disposed on the upper surface, and the plurality of wires is disposed on the upper surface and electrically connects the circuit board. The first side has a vertical portion and a first inclined portion, the vertical portion is substantially vertical to the upper surface and a portion is concave in a cross-sectional view. An included angle between the first inclined portion and the lower surface is greater than 90 degrees and less than 180 degrees, and the first inclined portion is greater than the vertical portion in roughness.