Sharp-Edged Prism Light Guide Plate for LCD Wet-Out Suppression
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Solution Overview
Problem
The existing side-edge type surface-emission optical apparatuses for LCD units face issues with the 'wet-out phenomenon' due to the broad contact area between the light guide plate and the flexible reflective sheet, which degrades light distribution characteristics and luminous intensity.
Innovation Solution
The light guide plate design features triangular prism sequences with asymmetrical structures, including a rising sloped surface and two straight-type falling sloped surfaces, where the slope angle of the first falling sloped surface is larger than the second, forming a sharper edge and reducing the contact area with the reflective sheet, thereby suppressing the wet-out phenomenon and enhancing light distribution control efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light guide plate uses a single falling sloped surface structure, then the manufacturing process is simple, but the contact area with the reflective sheet is large causing wet-out phenomenon
Solution Approach 1:
The single falling sloped surface is segmented into two distinct falling sloped surfaces (first and second falling sloped surfaces) with different slope angles. This segmentation reduces the contact area between the light guide plate and the reflective sheet, preventing the wet-out phenomenon while maintaining manufacturing feasibility through injection molding.
Solution Approach 2:
The patent introduces asymmetry by designing the two falling sloped surfaces with different slope angles (α1 and α2 where α1 > α2). This asymmetric structure creates a sharper edge that reduces contact area with the reflective sheet, eliminating the wet-out phenomenon while preserving the light guiding function.
2Illumination intensity
If the slope angle of the falling sloped surface is reduced to enhance luminous intensity, then the light distribution control improves, but the contact area with the reflective sheet increases causing wet-out phenomenon
Solution Approach 1:
The falling sloped surface is divided into two segments with different angles. The first falling sloped surface has a smaller angle to enhance luminous intensity and light distribution control, while the second falling sloped surface has a larger angle to reduce contact area and prevent wet-out phenomenon.
Solution Approach 2:
Different regions of the falling sloped surface are assigned different slope angles to fulfill different functions. The first falling sloped surface (with smaller angle) is optimized for light distribution control and luminous intensity, while the second falling sloped surface (with larger angle) is optimized for reducing contact area and preventing wet-out.
3Object-affected harmful factors
If the prism structure uses a sharper edge design, then the contact area with the reflective sheet is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for the slope angles (45° ≤ α1 < α2 ≤ 60°) to balance the sharpness of the edge with manufacturing feasibility. These parameter specifications ensure the prism structure achieves sufficient sharpness to reduce contact area while remaining manufacturable through conventional injection molding processes.
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 reduces the contact area between the light guide plate and the reflective sheet, effectively suppressing the wet-out phenomenon and improving the luminous intensity and spatial light distribution characteristics, resulting in enhanced performance compared to prior art.
Implementation Method 1
Each of the triangular prism sequences 12 includes a plurality of equidistantly-arranged triangular prisms for bending the path of light. In this case, the farther from the light incident surface Sin a location of the triangular prism sequences 12, the larger the width of the triangular prism sequences 12 at that location. Thus, much more light is totally reflected by the triangular prism sequences 12
Implementation Method 2
Each prism of the prism sequence has a rising sloped surface opposing the light incident surface, a first falling sloped surface connected to the rising sloped surface, and a second falling sloped surface connected to the first falling sloped surface. A slope of the first falling sloped surface is larger than a slope of the second falling sloped surface.
Data Source
AI summary
In a light guide plate having a light incident surface, a light distributing control surface perpendicular to the light incident surface and a light emitting surface opposing the light distributing control surface, a flat mirror-finish portion is provided on a first area of the light distributing control surface, and a prism sequence is provided on a second area of the light distributing control surface where the flat mirror-finish portion is not provided. The prism sequence is protruded with respect to the flat mirror-finish portion. Each prism of the prism sequence has a rising sloped surface opposing the light incident surface, a first falling sloped surface connected to the rising sloped surface, and a second falling sloped surface connected to the first falling sloped surface, A slope of the first falling sloped surface is larger than a slope of the second falling sloped surface.