Light Guide Plate Stripe Microstructures for Backlight Brightness Uniformity
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Solution Overview
Problem
Conventional backlight modules with point light sources, such as LEDs, suffer from light leakage and uneven brightness due to the directional nature of the light-emitting diodes, leading to poor appearance brightness uniformity and hot spots on the light incidence side.
Innovation Solution
A light guide plate with first and second stripe microstructures on its light-emitting surface, where the first microstructures scatter incident light in the non-visible region and the second microstructures vary in shape, angle, height, or arrangement to enhance luminance and uniformity, effectively addressing light leakage and brightness issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If point light sources (LEDs) are used to replace linear light sources, then energy efficiency and lifespan are improved, but brightness uniformity deteriorates due to directional light emission causing hot spots and light leakage
Solution Approach 1:
The light guide plate incorporates different microstructure regions with distinct functions: a first microstructure region near the light incidence surface scatters light to eliminate hot spots, while a second microstructure region farther from the incidence surface guides and distributes light to improve uniformity. This local differentiation of optical properties resolves the brightness uniformity issue while maintaining LED energy efficiency
Solution Approach 2:
The light guide plate acts as an intermediary between the directional LED light sources and the display panel, using microstructures to transform and redistribute the directional light into uniform illumination across the display area, thereby mediating between the point source nature of LEDs and the requirement for uniform backlight
2Ease of manufacture
If the cover's covering range is reduced to improve assembly ease, then manufacturing complexity is reduced, but light leakage increases in the non-visible region
Solution Approach 1:
The patent converts the previously harmful light leakage in the non-visible region into a beneficial effect by introducing scattering microstructures in the first microstructure region. These microstructures intentionally scatter light that would otherwise leak, transforming it into useful illumination that contributes to overall brightness uniformity and eliminates hot spots
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 significantly improves brightness uniformity and reduces light leakage, resulting in a more uniform and aesthetically pleasing light distribution across the backlight module.
Implementation Method 1
The first stripe microstructures can scatter incident light of a non-visible region, so that leakage light on the non-visible region can be effectively blurred
Implementation Method 2
Light 110 emitted by the light-emitting diodes 108 enters the light guide plate 102 through the light incidence surface 106, and is emitted out of the light guide plate 102 through the light-emitting surface 104 of the light guide plate 102 after being guided by the light guide plate 102
Data Source
AI summary
A light guide plate and a light source module are described. The light guide plate includes a main body, first stripe microstructures and second stripe microstructures. The main body includes a light incidence surface, a light-emitting surface and a light reflective surface opposite to the light-emitting surface. The light incidence surface is connected between the light-emitting surface and the light reflective surface. The light-emitting surface includes a first microstructure region and a second microstructure region arranged sequentially, and the first microstructure region is near the light incidence surface. The first stripe microstructures are disposed in the first microstructure region and extending along a direction from one side near the light incidence surface to the other side away from the light incidence surface. The second stripe microstructures are disposed in the second microstructure region along the direction. A gradient of each second stripe microstructure is gradually varied along the direction.