Light Guide Panel Intaglio Pattern for Backlight Efficiency
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in adjusting light emission angles due to the large difference in refractive indices between the light guide panel and air, leading to difficulties in light distribution adjustment, increased costs, and thickness of the backlight unit, especially with the need for diffusion and prism sheets.
Innovation Solution
A light guide panel with an intaglio-patterned lower surface and a lenticular-shaped upper pattern is formed using laser machining, where the lower pattern has inclined planes at 45-55° and a smooth surface, and the upper pattern is perpendicular to the length direction, allowing for improved light reflection and refraction without the need for additional sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If diffusion sheet and prism sheet are added to adjust light distribution, then light emission angle adjustment is improved, but device complexity and thickness increase
Solution Approach 1:
The patent combines the light distribution adjustment function into the light guide panel itself by forming patterns directly on its surface, merging the functions of the light guide panel with what would traditionally require separate diffusion sheets and prism sheets. This integration eliminates the need for multiple separate components while maintaining the desired light distribution characteristics.
Solution Approach 2:
The patent extracts the light distribution adjustment function from separate sheets and embeds it directly into the light guide panel structure through surface patterns. By taking out the adjustment capability and integrating it into the panel itself, the design reduces overall component count while preserving functionality.
2Ease of operation
If diffusion sheet and prism sheet are added to adjust light distribution, then light emission angle adjustment is improved, but manufacturing cost increases
Solution Approach 1:
By merging the light distribution adjustment function into the light guide panel through direct surface patterning, the patent eliminates the need to manufacture and assemble separate diffusion sheets and prism sheets. This integration reduces the total number of manufacturing steps and component assembly operations, thereby lowering overall manufacturing cost.
3Device complexity
If ink pattern with small dimensions is used, then light guide panel structure is simplified, but light emission angle adjustment becomes difficult
Solution Approach 1:
The patent applies local quality by creating patterns with specific geometric characteristics (inclined planes with 45-55° angles) at specific locations on the light guide panel surface. These locally optimized patterns provide the necessary light emission angle control while maintaining overall structural simplicity. The patterns are strategically positioned to address light distribution issues without complicating the overall panel design.
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
This configuration enhances light efficiency and brightness by up to 15% compared to traditional systems, reducing the need for diffusion and prism sheets, resulting in a thinner and lighter liquid crystal display device with cost savings.
Implementation Method 1
a lower pattern which is formed on a backside of the light guide panel for reflecting or refracting the light
Implementation Method 2
a lower pattern which is formed on a backside of the light guide panel for reflecting or refracting the light
Implementation Method 3
The lower pattern is formed to have a smooth and flat surface by directing a laser beam to an extrusion plate
Implementation Method 4
The ink pattern scatters the light totally reflected at, and traveling in, an inside of the light guide panel
Data Source
AI summary
The present invention relates to an apparatus for fabricating a light guide panel which can improve light efficiency and brightness, and a backlight unit having the light guide panel. The backlight unit includes a light source for generating a light, and a light guide panel for guiding the light incident thereon from the light source, the light guide panel having an upper pattern which is formed on a front side thereof for emitting the light guided thus to upward and a lower pattern which is formed on a backside thereof for reflecting or refracting the light, wherein the lower pattern of the light guide panel is formed in an intaglio pattern having a vertical angle at which two inclined planes meet, and one of the two inclined planes the light from the light source incident thereon has an angle of 45˜55°.