Inverted Prism Patterns for Display Light Efficiency
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Solution Overview
Problem
Display apparatuses experience significant light loss due to inefficient light distribution from backlight units, particularly in edge-type configurations where light is not effectively directed to the display panel, leading to reduced brightness and efficiency.
Innovation Solution
The implementation of prism patterns with specific inverted triangular shapes and refractive indices between the light guide plate and the display panel, including a first pattern with a higher refractive index and a second pattern with a lower refractive index, strategically positioned to refract light and minimize side leakage, enhancing light transmission to the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional prism sheet is used to concentrate light upwardly, then light concentration toward the display panel is improved, but light leakage to the side surface increases causing light loss
Solution Approach 1:
The patent applies local quality by creating two distinct pattern regions within the prism sheet: a first pattern region with higher refractive index and a second pattern region with lower refractive index. This local differentiation allows different parts of the prism sheet to perform different functions - the first pattern for light concentration and the second pattern for light reflection, thereby resolving the contradiction between light concentration and light leakage reduction.
Solution Approach 2:
The patent uses composite materials by combining regions with different refractive indices within the same prism sheet structure. The first pattern region and second pattern region are made of materials or structures with different optical properties, creating a composite optical system that simultaneously achieves light concentration and minimizes side leakage through the complementary actions of the two regions.
2Ease of manufacture
If the prism sheet structure is simplified, then manufacturing ease is improved, but light efficiency and brightness are reduced
Solution Approach 1:
The patent applies segmentation by dividing the prism sheet into multiple functional regions - the first pattern region and the second pattern region - each with specific geometric configurations and refractive index characteristics. This segmentation allows the complex optical function to be achieved through modular regional design rather than requiring a completely new complex structure, balancing manufacturing feasibility with optical performance.
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 significantly reduces light loss and improves light efficiency by ensuring that more light is directed to the display panel, resulting in enhanced brightness and reduced side leakage, as illustrated by the comparison with conventional prism patterns.
Implementation Method 1
a plurality of prism patterns disposed between the display panel and the light guide plate, and each of which has a shape of an inverted triangle in a cross-section... the second pattern having a refractive index less than that of the first pattern... to refract light and minimize side leakage
Data Source
AI summary
A display apparatus includes a plurality of prism patterns disposed between a display panel and a light guide plate and having a shape of an inverted triangle, each of the plurality of prism patterns including a first pattern including a first side having a shape of an inverted triangle, which faces the display panel, a second side connecting one end of the first side to a vertex of the inverted triangle disposed under the first side, and a third side connecting the other end of the inverted triangle to the vertex and a second pattern having a refractive index less than that of the first pattern and disposed in the first groove that is defined in the second side to extend in a direction crossing the second side.