Light Guide Plate Microstructure Inclination for Crosstalk Reduction
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Solution Overview
Problem
Current light source modules experience crosstalk phenomena where one optical pattern is faintly visible when another pattern is intended, due to light reflection from microstructures designed for different orientations.
Innovation Solution
A light guide plate with first and second microstructures on its surface, where the microstructures have inclined edge portions that divert light not intended for the main optical surface, reducing crosstalk by adjusting the included angles between these edges and the plate surface, allowing clear switching and display of different optical patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple microstructures are configured on the LGP surface to present different optical patterns, then the lighting effect and display capability are improved, but crosstalk phenomenon occurs where one pattern is faintly visible when another pattern is intended
Solution Approach 1:
The patent applies local quality by creating different microstructure types (first and second microstructures) with distinct optical properties on different regions of the LGP surface. The first microstructures have first optical surfaces optimized for receiving light from first light sources, while the second microstructures have second optical surfaces optimized for second light sources. This localized optimization reduces crosstalk by ensuring that each region primarily responds to its designated light source.
Solution Approach 2:
The patent employs asymmetry by designing the first and second microstructures with non-identical geometries and optical surface configurations. The first microstructures have specific edge portions with particular inclination angles relative to the first light incident surface, while the second microstructures have corresponding edges with different inclination angles relative to the second light incident surface. This asymmetric design prevents symmetric crosstalk patterns and optimizes light directionality for each pattern type.
2Ease of operation
If optical microstructures are formed on the LGP surface to provide pattern lighting effect, then the lighting functionality is improved, but light reflection from unused microstructures causes crosstalk
Solution Approach 1:
The patent converts the harmful light reflection from unused microstructures into a beneficial directional control mechanism. By carefully designing the edge portions of the microstructures with specific inclination angles, the patent ensures that light incident on unused microstructures is reflected away from the viewing angle rather than toward it. This transforms the previously harmful crosstalk reflection into a useful light directionality control feature.
Solution Approach 2:
The patent applies parameter changes by adjusting the inclination angles of the edge portions of the microstructures. The first edge portions have specific inclination angles relative to the first light incident surface, while the second edge portions have different inclination angles relative to the second light incident surface. By optimizing these angular parameters, the patent controls the reflection characteristics to minimize crosstalk while maintaining pattern display functionality.
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 configuration effectively deviates unwanted light from the viewer's perspective, minimizing crosstalk and enabling clear display of distinct optical patterns.
Implementation Method 1
a part of the light is still reflected to human eyes through optical surfaces of the microstructures used for presenting the pattern B
Data Source
AI summary
A light guide plate (LGP) and a light source module are provided. The LGP includes a plate body, first microstructures and second microstructures. The plate body has a first light incident surface, a second light incident surface adjacent to the first light incident surface and a first surface connected thereto. The first microstructures are located on the first surface, and each has a first optical surface facing the first light incident surface. Two sides of each first microstructure respectively have a first edge portion. One of the first edge portions faces and is inclined relative to the second light incident surface, and there is a first included angle between the first edge portion facing the second light incident surface and the first surface. The second microstructures are located on the first surface, and each second microstructure has a second optical surface facing the second light incident surface.