Light Guide Plate Periodic Microstructure Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing backlight modules for small-sized devices face challenges in controlling optical crosstalk between areas when using 1D local dimming techniques, which affects the convergence and contrast of high-dynamic range (HDR) image synthesis.
Innovation Solution
A light guide plate with a light waveguide layer and periodic microstructures on its emission surface is used to change the direction of light beams, improving convergence and reducing crosstalk by configuring transparent media layers with gradually increasing refractive indexes and incorporating a collimation structure to enhance light collimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If 1D local dimming technique is adopted in small-sized devices, then device size is reduced, but optical crosstalk between areas cannot be controlled
Solution Approach 1:
The light guide plate is divided into multiple light guiding areas with independent light incident surfaces, allowing separate control of light entry for each area. This segmentation enables independent optical control of different regions, reducing crosstalk while maintaining compact device size.
Solution Approach 2:
Different regions of the light guide plate are assigned different optical properties through localized microstructures and waveguide layers. Each light guiding area has tailored optical characteristics that control light distribution specifically for that region, minimizing interference with adjacent areas.
2Manufacturing precision
If light waveguide layer and periodic microstructures are configured, then light convergence characteristics are improved, but device complexity increases
Solution Approach 1:
Periodic microstructures are introduced on the light emission surface to systematically control light extraction and convergence. These repeating patterns provide predictable optical behavior that improves light convergence characteristics while maintaining manufacturability through standardized fabrication processes.
Solution Approach 2:
The refractive indexes of transparent media layers are gradually changed to create optimal light convergence. By adjusting material parameters rather than complex geometric configurations, the patent achieves improved light control with relatively simple structural changes.
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 reduces crosstalk between areas and improves light convergence characteristics, achieving better contrast and image synthesis for HDR images in small-sized devices.
Implementation Method 1
a light waveguide layer is configured within the transmission layer to change a transmission direction of at least a portion of light beams entered from the light incident surface to a direction perpendicular to the light emission surface
Implementation Method 2
at least one periodic microstructure is configured on the light emission surface
Data Source
AI summary
The present disclosure relates to a light guide plate and a backlight module thereof, wherein the light guide plate includes: a light incident surface, a transmission layer, and a light emission surface. Wherein a light waveguide layer is configured within the transmission layer to change a transmission direction of at least a portion of light beams entered from the light incident surface along a direction perpendicular to the light emission surface. At least one periodic microstructure is configured on the light emission surface. The present disclosure may improve convergence characteristics of the light beams entered the light guide plate and may reduce the crosstalk between areas.