Light Guide Plate Dimple Optical Controllers for Uniform Brightness
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Solution Overview
Problem
Existing light guide type backlight apparatuses face challenges in achieving uniform brightness distribution and efficient light transmission, particularly in thin displays, due to limitations in power consumption and light source arrangement, and require complex structures to diffuse light effectively.
Innovation Solution
A light guide plate with dimple type optical controllers formed on its surfaces, which have reflective surfaces that incline to reflect light between the surfaces, allowing for improved light distribution and efficiency without the need for additional optical films, and can be fabricated using a simple lithography process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light sources are arranged on the edge of the light guide plate, then the apparatus can be made thin, but the brightness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating regions with different optical properties within the light guide plate. Specifically, it uses a first light guide plate with a first refractive index and a second light guide plate with a second refractive index different from the first, forming distinct optical zones that locally control light distribution to achieve uniform brightness while maintaining thin profile
Solution Approach 2:
The patent employs composite materials by combining light guide plates with different refractive indices. The first and second light guide plates are made of different materials or have different refractive indices, creating a composite structure that optimizes both thickness and brightness uniformity through the synergistic optical properties of the combined materials
2Illumination intensity
If multiple light sources are arranged to improve brightness, then brightness increases, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by varying the refractive index parameter across different regions of the light guide plate. By adjusting the refractive index of the first and second light guide plates, the system optimizes light distribution efficiency, achieving high brightness with reduced power consumption through improved optical parameter management
3Volume of moving object
If the light guide plate thickness is reduced for thin displays, then the apparatus becomes thinner, but light diffusion capability deteriorates
Solution Approach 1:
The patent applies local quality by creating functionally distinct regions within the thin light guide plate structure. The first and second light guide plates with different refractive indices form local optical zones that perform different light diffusion functions, enabling effective light distribution even in the reduced thickness of modern flat panel displays
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 enables a thin, lightweight, and cost-effective lighting apparatus with enhanced light-use efficiency, suitable for both backlight and front light applications, including flexible displays, by distributing light uniformly and reducing external light reflection.
Implementation Method 1
a plurality of dimple type optical controllers formed beneath at least one of the first surface and the second surface and having reflective surfaces that reflect light proceeding between the first and second surfaces of the body toward at least one of the first and second surfaces
Data Source
AI summary
Provided are a light guide member, a lighting apparatus including the light guide member, and a method of fabricating the light guide member. The light guide member comprises: a body, which is formed as a transparent plate, including a first surface and a second surface facing the first surface; and a plurality of dimple type optical controllers formed beneath at least one of the first surface and the second surface and having reflective surfaces that reflect light proceeding between the first and second surfaces of the body toward at least one of the first and second surfaces.