Illumination Device Light Diffusion Distance Maintaining Layer
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving uniform brightness and preventing bright spots from light emitting elements, which can lead to non-uniform illumination and decreased display quality.
Innovation Solution
The illumination device comprises a wiring board with light emitting elements, a light diffusion distance maintaining layer, a wavelength conversion layer, and a prism sheet. The light emitting elements are independently driven in segment regions, and the light diffusion distance maintaining layer is designed to diffuse light effectively, ensuring uniform brightness across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are disposed directly under a liquid crystal panel with a light guide interposed therebetween to increase brightness, then illumination intensity is improved, but bright spots appear and illumination uniformity deteriorates
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the light emitting elements and the liquid crystal panel. The light guide plate diffuses and redirects light from the LEDs, transforming direct point-source illumination into uniform area illumination, thereby eliminating bright spots while maintaining high brightness levels.
Solution Approach 2:
The patent optimizes the thickness and refractive index parameters of the light guide plate to control light diffusion characteristics. By adjusting these physical parameters, the system achieves optimal balance between brightness enhancement and illumination uniformity, preventing bright spot formation while maximizing luminous output.
2Length of moving object
If the light diffusion distance maintaining layer is made thinner to reduce device thickness, then device compactness is improved, but light diffusion effectiveness deteriorates leading to non-uniform brightness
Solution Approach 1:
The light diffusion distance maintaining layer is constructed from composite materials with specific optical properties, including materials with controlled refractive indices and light scattering characteristics. This composite structure enables effective light diffusion within a thin profile, achieving both device compactness and brightness uniformity simultaneously.
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 illumination quality by preventing bright spots and ensuring uniform brightness, thereby improving the overall display quality and contrast ratio of the liquid crystal display device.
Implementation Method 1
a light diffusion distance maintaining layer that is provided above the light emitting elements
Implementation Method 2
a wavelength conversion layer that is provided above the light diffusion distance maintaining layer
Data Source
AI summary
According to one embodiment, an illumination device comprises a plurality of light emitting elements that are disposed on a main surface of a wiring board, a light diffusion distance maintaining layer, a wavelength conversion layer, and a prism sheet, wherein the main surface of the wiring board is divided into a plurality of segment regions, n (n>1) light emitting elements are provided in each of the segment regions, the light emitting elements are independently driven in units of the segment regions, and a thickness of the light diffusion distance maintaining layer is ½ times or more a pitch of the segment regions adjacent to each other.