Light Guide Plate V-Groove Pattern for Thin Surface Light Source
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Solution Overview
Problem
Surface light source devices face challenges in achieving thinness and high light-use efficiency due to light leakage and the restricted thickness of light guide plates, which limits their application in portable devices.
Innovation Solution
The surface light source device incorporates a light guide plate with a thicker light introducing portion and a directivity converting pattern featuring V-shaped groove structures, which redirects light to minimize leakage and enhance efficiency, allowing for a thinner light guide plate while maintaining high luminance and reducing dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the light guide plate is made thinner than the height of the light exit window of the point light source, then the device achieves thinness, but light not entering the light guide plate increases and light-use efficiency is reduced
Solution Approach 1:
The invention introduces a light introducing portion that extends in the thickness direction (z-direction) to create a three-dimensional light collection structure. This allows the light guide plate body to remain thin while the light introducing portion captures light from the point light source at a greater thickness, effectively solving the contradiction between thinness and light-use efficiency by utilizing the thickness dimension for light collection.
Solution Approach 2:
The light introducing portion is integrated within or adjacent to the light guide plate body, with the light guide plate body being thinner than the light introducing portion. This nested configuration allows the thinner light guide plate body to be supported by the thicker light introducing portion that performs the light collection function, enabling both thinness and high light-use efficiency to coexist.
2Length of moving object
If a tapered portion is provided at the end portion of the light guide plate to enable light entry, then the thickness can be reduced, but light leakage occurs and display quality deteriorates
Solution Approach 1:
The invention applies different structural characteristics to different portions of the light guide plate: the light introducing portion has a larger thickness and specific shape optimized for light collection, while the light guide plate body has a uniform, thinner structure optimized for light guidance and emission. This local differentiation allows the thin body to avoid light leakage while the thicker introducing portion ensures efficient light capture.
3Length of moving object
If the light guide plate body is made much thinner than the tapered portion, then thinness is achieved, but the light-emitting area is reduced
Solution Approach 1:
The invention divides the light guide plate into two functional segments: the light introducing portion responsible for light collection and the light guide plate body responsible for light guidance and emission. This segmentation allows the light-emitting area of the thin body to be maximized while the light introducing portion compensates for thickness requirements, preventing reduction in effective light-emitting area.
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 configuration significantly reduces light leakage, improves light-use efficiency, and increases the light-emitting area, making it suitable for thinner, more efficient surface light source devices.
Implementation Method 1
light entering through the end face of the tapered portion is totally reflected by front and back faces of the tapered portion to be guided into the light guide plate body
Data Source
AI summary
A light guide plate includes a light introducing portion which is positioned facing a point light source and which confines light, and a light guide plate body which is thinner than a maximum thickness of the light introducing portion and which causes a light exit means to emit the confined light outward. The light introducing portion has an inclined face which is inclined from a portion having the maximum thickness to a surface of the light guide plate body. The inclined face includes a directivity converting pattern for converting a directional characteristic of the light that has entered the light introducing portion. The directivity converting pattern's structure includes a plurality of V-shaped grooves. An inscribed circle of the directivity converting pattern passes through both ends of a light exit window of the point light source.