Light Guide Plate With Polygonal Microstructures For Light Concentration
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Solution Overview
Problem
Conventional light guide plates suffer from unsatisfactory light emission efficiency and directivity due to non-uniform light paths and poor light concentration caused by plano-convex microdots, which restrict the adjustment of emission angles and light utilization.
Innovation Solution
A light guide plate with a light guide layer and a first microstructure layer featuring polygonal planar bases and inclined faces, allowing for adjustable angles of light concentration and exit, enhancing light uniformity and collimation through controlled reflection and refraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional plano-convex microdots with curved surfaces are used, then light can be reflected to the light exit surface, but the light reflected is of diffusion type and cannot be concentrated, resulting in poor light concentration and unsatisfactory directivity
Solution Approach 1:
The microdot structure is segmented into multiple flat inclined faces (first and second inclined faces) instead of a continuous curved surface. Each inclined face reflects light in a specific direction, and by arranging multiple such faces around the microdot, light from different angles can be controlled and concentrated toward the light exit surface, improving both light concentration and directivity.
Solution Approach 2:
Instead of using a curved concave surface that diffuses light, the invention inverts the approach by using multiple flat inclined faces that actively direct and concentrate light. The flat surfaces with specific inclination angles redirect light paths to achieve concentration rather than diffusion, fundamentally changing the light control mechanism.
2Adaptability or versatility
If conventional microdots with fixed curved surfaces are used, then light reflection occurs, but the reflection angle cannot be adjusted, making it impossible to control the emission angle and improve light utilization rate
Solution Approach 1:
The microdot structure transitions from a static curved surface to a dynamic configuration of multiple flat inclined faces with adjustable inclination angles. By modifying the angles of the first and second inclined faces, the reflection angles can be tuned to control emission angles, enabling adaptability in light direction and improving light utilization rate through optimized angular control.
Solution Approach 2:
The invention changes the geometric parameters of the microdot by defining specific inclination angles for the first and second inclined faces relative to the base. These parameter changes allow precise control over light reflection angles and emission directions, enabling optimization of light paths and reduction of energy loss through adjusted angular configurations.
3Productivity
If conventional microdots are used, then some light paths reach the microdots after total reflection, but non-uniform light paths result in unsatisfactory light emission efficiency
Solution Approach 1:
The microdot structure employs local quality variations through multiple flat inclined faces with different orientations. Each inclined face is positioned and angled to handle specific incident light paths, creating localized light control zones. This allows uniform distribution of light reflection across different incident angles, converting non-uniform light paths into uniform light emission and improving overall light emission efficiency.
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 improves light emission efficiency and directivity by allowing for precise control of light angles and concentration, achieving higher light collimation and uniformity, even when combined with a prism sheet.
Implementation Method 1
Each of the first microstructures has two first inclined faces and two second inclined faces... The first inclined faces of each of the first microstructures are arranged along a first direction that is parallel to the light incidence surface... The second inclined faces of each of the first microstructures are arranged along the first direction
Implementation Method 2
According to Snell's law, the light emitted from the light source 12, after entering the light guide plate 11 through the light incidence surface 111 thereof, is supposed to undergo total reflection in the light guide plate 11
Implementation Method 3
the light emitted from the light source 12, after entering the light guide plate 11 through the light incidence surface 111 thereof, is supposed to undergo total reflection in the light guide plate 11 since the refraction index of the light guide plate 11 is larger than that of air
Data Source
AI summary
A light guide plate includes a light guide layer and a first microstructure layer. The light guide layer has a light exit surface, a back surface, and a light incidence surface interconnecting the light exit surface and the back surface. The first microstructure layer is disposed on the back surface, and includes a plurality of first microstructures spaced apart from one another. Each first microstructure has a polygonal planar base, and two first inclined faces and two second inclined faces which extend from the planar base, and which are proximal and distal to the light incidence surface, respectively. Each first inclined face intersects the respective second inclined face at a respective first ridge. Each first ridge cooperates with the planar base to form a first angle that ranges from 5 to 70 degrees.