Concave-Pattern Light Guide Plate for Thin Uniform Backlights
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight units suffer from increased thickness, manufacturing costs, and optical inefficiencies due to the use of multi-layer diffuser and prism sheets, and are prone to image defects like rainbow patterns and searchlight phenomena without proper light guide plate design.
Innovation Solution
A light guide member with concave patterns on its surface, featuring specific angles and curvatures, eliminates the need for diffuser and prism films by optimizing pattern design and refractive index, enhancing manufacturing productivity and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-layer diffuser and prism sheets are used in conventional backlight units, then image defects such as rainbow patterns and searchlight phenomena can be reduced, but the thickness of the backlight unit increases and manufacturing costs increase
Solution Approach 1:
The patent combines the functions of the light guide plate, diffuser, and prism into a single integrated structure. The light guide plate includes both light guiding functionality and surface patterns that perform diffusing and directing functions, eliminating the need for separate multi-layer sheets and reducing overall thickness.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: guiding light from the edge, creating uniform illumination, and controlling light emission angles through its surface patterns. This multi-functional design replaces multiple specialized components with a single versatile element.
2Reliability
If multi-layer diffuser and prism sheets are used in conventional backlight units, then image defects can be reduced, but manufacturing costs increase
Solution Approach 1:
The patent combines the functions of the light guide plate, diffuser, and prism into a single integrated structure. The light guide plate includes both light guiding functionality and surface patterns that perform diffusing and directing functions, eliminating the need for separate multi-layer sheets and reducing overall thickness.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: guiding light from the edge, creating uniform illumination, and controlling light emission angles through its surface patterns. This multi-functional design replaces multiple specialized components with a single versatile element.
3Illumination intensity
If conventional light guide plate patterns are used, then light can be emitted from the light guide plate, but image defects such as rainbow patterns and searchlight phenomena occur
Solution Approach 1:
The patent applies different pattern characteristics to different regions or aspects of the light guide plate. The surface patterns have specific geometric configurations with controlled parameters (depth, spacing, shape) that create localized light scattering and directing effects to eliminate rainbow patterns and searchlight phenomena while maintaining overall light emission.
Solution Approach 2:
The patent optimizes specific parameters of the surface patterns including depth, spacing, shape, and distribution to control light emission characteristics. By carefully adjusting these parameters, the design achieves uniform light emission while eliminating image defects such as rainbow patterns and searchlight effects.
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 effectively reduces image defects and lowers production costs by using a single plate structure with optimized patterns, ensuring uniform light emission and improved optical efficiency.
Implementation Method 1
a specific light component is incident at a narrow angle due to refractive index properties when light from a LED light source is incident to an incident surface of the light guide plate
Implementation Method 2
a plurality of patterns configured to reflect light incident through the incident surface
Data Source
AI summary
A light guide member includes: an incident surface; a pattern arrangement surface on which a plurality of patterns configured to reflect light incident through the incident surface are formed; and a light emitting surface through which the light reflected from the plurality of patterns is emitted. Each of the patterns is a concave pattern and defined by a plurality of surfaces formed on the pattern arrangement surface, the plurality of surfaces include a first surface that is convex in a direction toward the incident surface and a second surface that faces the first surface and is convex/concave in the direction toward the incident surface, an angle between the pattern arrangement surface and a cross-section obtained by cutting the first surface in a direction perpendicular to the incident surface is an obtuse angle, and an angle between the pattern arrangement surface and a cross-section obtained by cutting the second surface.