Light Guide Plate With Embedded Refractive Beads
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Solution Overview
Problem
Existing display devices face challenges in reducing manufacturing costs and overall thickness while maintaining efficient light distribution, particularly in backlight units.
Innovation Solution
A backlight unit incorporating a light guide plate with a base layer, a light transmitting layer, and light transmitting particles of higher refractive index, which emits light uniformly to the display panel, reducing the need for additional optical sheets and simplifying manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additional optical sheets and patterns are used to achieve uniform light distribution, then light uniformity is improved, but device thickness and manufacturing complexity increase
Solution Approach 1:
The patent combines the light guide plate base layer and the light diffusing layer into a single integrated structure. The base layer contains light transmitting particles (beads) with higher refractive index embedded within it, eliminating the need for separate optical sheets and reducing manufacturing steps while achieving uniform light distribution.
Solution Approach 2:
The light guide plate uses a composite material structure where light transmitting particles (with refractive index 1.4-2.0) are embedded in a base layer material (with refractive index 1.1-1.3). This composite structure enables effective light diffusion and uniformity without requiring additional optical components.
2Illumination intensity
If additional optical sheets are added to improve light distribution, then light uniformity is improved, but overall device thickness increases
Solution Approach 1:
The patent merges the base layer and light diffusing layer into one integrated light guide plate structure. The light transmitting particles are embedded directly within the base layer, eliminating the need for separate optical sheets and thereby reducing the overall device thickness while maintaining light uniformity.
3Illumination intensity
If complex patterns are used on the light emission surface, then light uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by embedding light transmitting particles (beads) with specific refractive indices within the base layer at strategic positions. This localized modification of optical properties achieves uniform light distribution without requiring complex surface patterns, thereby reducing manufacturing precision requirements.
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 achieves reduced manufacturing costs and a thinner display device with improved light uniformity and luminance, without the need for separate patterns or additional optical sheets.
Implementation Method 1
The light transmitting particle has a refractive index higher than a refractive index of the light transmitting layer
Data Source
AI summary
A backlight unit and a display device includes a light source which generates light used by a display panel to display an image; and a light guide plate which receives the light from the light source and emits the light through a light emission surface thereof. The light guide plate includes: a base layer; a light transmitting layer on the base layer and defining the light emission surface of the light guide plate; and a light transmitting particle provided in plurality between the base layer and the light transmitting layer. The light transmitting particle has a refractive index higher than a refractive index of the light transmitting layer.