Tapered Light Guide Plate for Reducing Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses with edge-illumination type backlight units face challenges in achieving improved display quality and light utilization efficiency due to light leakage and manufacturing defects, particularly in the coupling of light guide plates with different materials and refractive indices.
Innovation Solution
A display apparatus is designed with a light guide plate comprising a first material and a second material with a higher refractive index and hardness, where the second material forms a tapered shape coupled to the first material, reducing light leakage and manufacturing defects through separate formation processes such as injection molding, imprinting, inkjet, or gravure printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light guide plate with multiple materials and tapered shape is used, then light utilization efficiency and display quality are improved, but manufacturing complexity increases
Solution Approach 1:
The light guide plate is divided into multiple light guide parts with different materials and optical properties. Each part is formed through separate manufacturing processes (injection molding, imprinting, inkjet, or gravure printing) and then coupled together. This segmentation allows optimization of each part's light guiding characteristics while managing manufacturing complexity through modular assembly.
Solution Approach 2:
The light guide plate employs composite structure with first and second light guide parts made of different materials. The second light guide part has a tapered shape with varying thickness. This composite material approach enables improved light utilization efficiency by combining materials with different refractive indices and optical properties to reduce light leakage and enhance light extraction.
2Manufacturing precision
If separate formation processes are used for different light guide parts, then manufacturing precision and defect reduction are improved, but manufacturing time increases
Solution Approach 1:
Different light guide parts are formed through separate preliminary processes (injection molding for structural parts, imprinting for surface patterns, inkjet or gravure printing for optical patterns) before final assembly. This preliminary action allows each part to be optimized for its specific manufacturing requirements, improving overall manufacturing precision and reducing defects in the final light guide plate assembly.
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 enhances display quality by reducing light leakage and improving light utilization efficiency, while also increasing manufacturing yield by using materials with distinct properties and forming techniques to minimize defects in the light guide plate assembly.
Implementation Method 1
a refractive index of the second material may be greater than a refractive index of the first material
Data Source
AI summary
A display apparatus includes a display panel, a light source, a light guide plate, and a receiving part. The display panel is configured to receive light to display an image. The light source is configured to emit the light. The light guide plate is configured to receive and guide the light to the display panel. The receiving part is configured to hold the light source and the light guide plate. The light guide plate includes a first light guide part and a second light guide part. The first light guide part includes a first material. The second light guide part includes a second material different from the first material. The second light guide part has a tapered shape and is coupled to the first light guide part.