Light Guide Plate Hole and Saw-Toothed Prism for Compact Backlight
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Solution Overview
Problem
Conventional surface light source apparatuses require a V-shaped end for the light guide plate to efficiently reflect light from a point light source, increasing the apparatus size and leading to high-brightness regions escaping without propagation, thus necessitating a larger frame to prevent light leakage.
Innovation Solution
A surface light source apparatus featuring a light guide plate with a hole for the point light source and a saw-toothed prism on one side surface, which refracts light to enhance in-plane brightness uniformity and light utilization efficiency without increasing the frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a V-shaped end is formed in the light guide plate to totally reflect light from a point light source, then light reflection efficiency is improved, but the distance from the point light source to the end of the light guide plate increases, leading to increased frame size
Solution Approach 1:
The patent applies local quality by forming a V-shaped groove only at the specific location where light from the point light source needs to be reflected, rather than making the entire light guide plate structure larger. This localized modification achieves total reflection of light while maintaining a compact overall frame size, resolving the contradiction between reflection efficiency and frame size.
2Object-generated harmful factors
If a reflector is added to block light and prevent high-brightness regions from exiting without propagation, then light leakage is prevented, but the device complexity and frame size increase
Solution Approach 1:
The patent merges the reflection function into the light guide plate itself by forming a V-shaped groove directly on the light guide plate structure. This integration eliminates the need for a separate reflector component, thereby preventing light leakage while avoiding increased device complexity and maintaining a compact frame size.
3Illumination intensity
If the light guide plate structure is modified to improve in-plane brightness uniformity, then brightness uniformity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the light guide plate by introducing a V-shaped groove with specific dimensions and angles. This parameter modification alters the light propagation characteristics to improve in-plane brightness uniformity. The groove can be formed using standard manufacturing processes, balancing improved optical performance with manufacturing feasibility.
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 saw-toothed prism configuration effectively refracts light, improving in-plane brightness uniformity and light utilization efficiency while maintaining a compact apparatus size by preventing light leakage and optimizing light propagation within the light guide plate.
Implementation Method 1
a prism having a saw-toothed shape in a cross-section thereof parallel to a front surface of the light guide plate... a light having reached the one side surface can be refracted by the prism
Implementation Method 2
an end of the light guide plate is formed into a V-like shape in order to totally reflect a light emitted from a point light source
Data Source
AI summary
A surface light source apparatus capable of keeping a high in-plane brightness uniformity and a high light utilization efficiency without increasing the size of a frame, and also to provide a display apparatus including the surface light source apparatus. The surface light source apparatus includes a point light source, and a light guide plate having a hole formed near first side surface that is one side surface thereof, the hole being formed at a position where the point light source is to be arranged. The first side surface of the light guide plate has, in a portion thereof near the hole, a prism having a saw-toothed shape in a cross-section thereof parallel to a front surface of the light guide plate.