Light Guide Plate Inclined Surface Viewing Angle Brightness
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Solution Overview
Problem
Conventional front-light display devices suffer from low light-emitting brightness due to divergent light angles exceeding 10 degrees, which results in inefficient light reception within the normal viewing angle of ±15 degrees.
Innovation Solution
A light guide plate with an inclined surface structure and multiple light guide structures that refract and reflect light rays with greater incident angles, improving light utilization efficiency and emitting brightness within the desired viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the included angle between optical axis and light direction is increased to expand viewing angle, then the light-emitting angle increases, but the light cannot be efficiently received by user's eyes within normal viewing angle of ±15 degrees, causing low brightness
Solution Approach 1:
The light guide plate incorporates different surface structures at different locations: a first surface with microstructures for light extraction and a second surface with inclined surfaces for angle correction. This local differentiation allows the plate to simultaneously manage light distribution and viewing angle control, resolving the contradiction between broad adaptability and focused brightness.
Solution Approach 2:
The inclined surfaces on the second surface of the light guide plate create curved/reflected light paths that redirect divergent rays back toward the normal viewing angle. This geometric curvature approach transforms the divergent light distribution into a concentrated beam within the ±15 degree range, improving brightness while maintaining acceptable viewing angle coverage.
2Productivity
If conventional light guide plate structure is used, then device complexity is low, but light utilization efficiency is poor due to divergent light angles
Solution Approach 1:
The light guide plate is segmented into distinct functional zones: a first surface with light-extraction microstructures and a second surface with angle-correcting inclined surfaces. This segmentation allows each zone to perform its specific function optimally, improving overall light utilization efficiency while keeping the overall structure relatively simple and manufacturable.
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 light guide plate enhances light-emitting brightness by efficiently redirecting and refracting light rays with larger incident angles, resulting in improved light utilization and increased brightness within the normal viewing angle, as demonstrated by a 17% to 69% improvement in light-emitting energy.
Implementation Method 1
After reflected by the inclined surface structure, the rays with greater incident angle can be reflected toward the bottom side of the light guide plate at a better angle
Implementation Method 2
Through further reflection by the display panel and guidance by the light guide structures, the rays can be emitted at a smaller angle of refraction
Data Source
AI summary
A light guide plate has a top side and a bottom side that are opposite to each other, and has a light-incident surface, a light-emitting surface, multiple light guide structures, and an inclined surface structure. The light-incident surface is located at an end of the light guide plate. The light-emitting surface is located on the top side of the light guide plate and is connected to the light-incident surface. The light guide structures are disposed on the light-emitting surface, and each one of the light guide structures has a light-facing surface and an opposite light-facing surface connected to a side of the light-facing surface away from the light-incident surface. The inclined surface structure is connected to the light-incident surface and the bottom side of the light guide plate. A front light module having the light guide plate and a display device having the front light module are also provided.