Light Guide Module Side Surface Roughness for Narrow Bezel Light Leakage
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Solution Overview
Problem
Narrow bezel display modules suffer from light leakage at the edges due to excessive surface roughness of the light guide plate, which affects the display effect and cannot be effectively addressed by existing technologies.
Innovation Solution
A light guide module with a surface roughness of the side surfaces ranging from 300 nm to 400 nm, integrated with a light-shielding layer of less than 4 mm width, reduces light diffusion and reflection, ensuring uniform brightness across the light-exiting surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel width is reduced to achieve narrow bezel architecture, then the display appearance and visible area are improved, but light leakage occurs at the edge of the visible area
Solution Approach 1:
The patent applies different surface roughness values to different regions of the light guide plate. Specifically, the edge region adjacent to the light-shielding layer has a surface roughness of 300-400nm, while the central region has a different roughness value. This local differentiation allows the edge region to control light propagation and prevent leakage, while the central region maintains overall light uniformity, thus resolving the contradiction between narrow bezel and light leakage prevention.
Solution Approach 2:
The patent changes the surface roughness parameter of the light guide plate to specific values (300-400nm at edges) to control light behavior. By precisely controlling this physical parameter, the patent achieves effective light leakage prevention at the edges while maintaining the narrow bezel design, demonstrating how parameter optimization can resolve technical contradictions.
2Illumination intensity
If the surface roughness of the light guide plate edges is increased to improve optical effect, then light diffusion is enhanced, but light leakage in the visible area cannot be effectively solved
Solution Approach 1:
The patent applies different surface roughness values to different regions of the light guide plate. Specifically, the edge region adjacent to the light-shielding layer has a surface roughness of 300-400nm, while the central region has a different roughness value. This local differentiation allows the edge region to control light propagation and prevent leakage, while the central region maintains overall light uniformity, thus resolving the contradiction between narrow bezel and light leakage prevention.
Solution Approach 2:
The patent changes the surface roughness parameter of the light guide plate to specific values (300-400nm at edges) to control light behavior. By precisely controlling this physical parameter, the patent achieves effective light leakage prevention at the edges while maintaining the narrow bezel design, demonstrating how parameter optimization can resolve technical contradictions.
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 prevents light leakage at the edges of the visible area, providing a more uniform brightness and improved display effect without local bright spots, while maintaining the narrow bezel architecture.
Implementation Method 1
the diffusion and reflection of the light propagating in the light guide plate at the edges can be reduced
Implementation Method 2
the diffusion and reflection of the light propagating in the light guide plate at the edges can be reduced
Data Source
AI summary
A light guide module includes a cover plate, a light-shielding layer, a light guide plate, and at least one light source. The light-shielding layer is disposed under the cover plate and has a width less than about 4 mm. The light guide plate is disposed under the cover plate. The light guide plate has a reflective surface and a light-exiting surface opposite to each other, and a light-incident surface and three side surfaces connected between the reflective surface and the light-exiting surface. The light source is configured to emit light toward the light-incident surface. A surface roughness of the three side surfaces ranges from about 300 nm to about 400 nm, so that a change rate of brightness measured by any adjacent two of measuring points evenly distributed on the light-exiting surface is between about 8% and about 12%.