Light Guide Plate Stripe Microstructures for Backlight Uniformity
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Solution Overview
Problem
Conventional light guide plates in backlight modules often experience non-uniform brightness and hotspot phenomena due to direct contact with light-emitting diodes, leading to optical appearance issues and inadequate light distribution.
Innovation Solution
A light guide plate with multiple types of stripe microstructures on its optic surface, including first, second, and third stripe microstructures, which are designed to mix light, control optical trends, and enhance light-emitting efficiency and uniformity by varying shapes, heights, and arrangements, thereby improving luminance and luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light-incident surface of the light guide plate contacts the light-emitting surface of light-emitting diodes, then light efficiency is improved, but non-uniform brightness and hotspot phenomena occur
Solution Approach 1:
The patent applies local quality by introducing different types of microstructures (first, second, and third stripe microstructures) at different locations on the optic surface. The first stripe microstructures are positioned near the light incidence surface to address hotspot issues, while the second and third stripe microstructures are positioned at different depths to control light distribution and improve overall brightness uniformity.
Solution Approach 2:
The patent segments the optic surface into multiple regions with different microstructure types. The first area contains first stripe microstructures, the second area contains second stripe microstructures, and the third area contains third stripe microstructures. This segmentation allows each region to perform specific functions for light distribution and uniformity control.
2Illumination intensity
If prism microstructures are disposed on the light-emitting surfaces to mix light uniformly, then light distribution is improved, but too much light concentration and strong light directivity occur
Solution Approach 1:
The patent uses local quality by employing different microstructure types at different locations. The first stripe microstructures have different inherent types than the second stripe microstructures, allowing each to provide specific light control functions. This prevents excessive light concentration and directivity while maintaining uniform distribution.
Solution Approach 2:
The patent changes parameters such as the width, height, and depth of the stripe microstructures to optimize light distribution. The second stripe microstructures have widths that vary along their length, and the third stripe microstructures have different inherent types, allowing precise control over light concentration and directivity to avoid harmful 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 use of these microstructures effectively addresses non-uniform brightness and hotspot issues, enhancing light distribution and luminance uniformity across the light guide plate, resulting in improved optical performance.
Implementation Method 1
The first stripe microstructures are disposed on the first area of the optic surface, and each of the first stripe microstructures extends along a direction which is vertical to the light incidence surface. The second stripe microstructures are disposed on the second area of the optic surface, and each of the second stripe microstructures extends along the direction which is vertical to the light incidence surface
Implementation Method 2
the light guide plate has plural stripe microstructures, thereby solving the problem of the non-uniform brightness phenomenon generated on the light guide plate and increasing illumination uniformity
Data Source
AI summary
A light guide plate, a backlight module and a display device are provided. The light guide plate includes a main body, first stripe microstructures, second stripe microstructures and third stripe microstructures. The main body includes a light incidence surface and an optic surface having a first area and a second area. The first area is disposed nearer the light incidence surface. The first stripe microstructures and the second stripe microstructures are respectively disposed on the first area and the second area. Each of the first stripe microstructures and the second stripe microstructures extends along the direction vertical to the light incidence surface. A width of one end of each second stripe microstructure near the light incidence surface is smaller than a width of the other end away from the light incidence surface. The third stripe microstructures are distributed on a partial or the whole region of the optic surface.