Two-Stage Wedge Light Guide Plate for Thin Backlight Modules
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Solution Overview
Problem
Conventional edge type backlight modules face reduced light guide efficiency when the thickness of the light guide plate decreases or the wedge width is reduced, leading to suboptimal performance in achieving both thinness and high light guide efficiency simultaneously.
Innovation Solution
A two-stage wedge structure is introduced in the light guide plate, featuring a first incline and a second incline with distinct slopes, where the inner angle between the second incline and the plate surface is greater than 18 degrees, allowing light to be reflected and travel in directions approximately parallel to each other, enhancing light guide efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the light guide plate is reduced to achieve thinner design, then the slimness is improved, but the light guide efficiency deteriorates
Solution Approach 1:
The wedge structure is divided into two distinct stages: a first wedge portion with a first wedge angle and a second wedge portion with a second wedge angle. This segmentation allows each portion to optimize light guidance at different thickness regions, maintaining high light guide efficiency even when the overall plate thickness is reduced to 0.2mm or less.
Solution Approach 2:
Different wedge angles are applied at different locations within the light guide plate. The first wedge portion has a smaller wedge angle optimized for light entry, while the second wedge portion has a larger wedge angle optimized for light extraction. This local differentiation of structural properties ensures optimal light guidance throughout the thin plate structure.
2Length of moving object
If the wedge width is reduced to achieve thinner design, then the slimness is improved, but the light guide efficiency deteriorates
Solution Approach 1:
The wedge structure is divided into two distinct stages: a first wedge portion with a first wedge angle and a second wedge portion with a second wedge angle. This segmentation allows each portion to optimize light guidance at different thickness regions, maintaining high light guide efficiency even when the overall plate thickness is reduced to 0.2mm or less.
Solution Approach 2:
Different wedge angles are applied at different locations within the light guide plate. The first wedge portion has a smaller wedge angle optimized for light entry, while the second wedge portion has a larger wedge angle optimized for light extraction. This local differentiation of structural properties ensures optimal light guidance throughout the thin plate structure.
3Length of moving object
If the thickness of the light guide plate is reduced, then the slimness is improved, but the uniformity of light distribution deteriorates
Solution Approach 1:
The wedge structure is divided into two distinct stages: a first wedge portion with a first wedge angle and a second wedge portion with a second wedge angle. This segmentation allows each portion to optimize light guidance at different thickness regions, maintaining high light guide efficiency even when the overall plate thickness is reduced to 0.2mm or less.
Solution Approach 2:
Different wedge angles are applied at different locations within the light guide plate. The first wedge portion has a smaller wedge angle optimized for light entry, while the second wedge portion has a larger wedge angle optimized for light extraction. This local differentiation of structural properties ensures optimal light guidance throughout the thin plate structure.
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 proposed solution significantly improves light guide efficiency and reduces hot spot defective rates, achieving up to 68.9% light guide efficiency with a hot spot defective rate of 3.27%, while maintaining a thin and efficient design.
Implementation Method 1
the lower light travels in the light guide plate along a first travelling direction after being reflected by the first incline; and the upper light travels in the light guide plate along a second travelling direction after being reflected by the second incline
Data Source
AI summary
A light guide plate includes a plate body and a light incident portion, wherein the plate body has a top plate surface. The light incident portion is formed on a side of the plate body and has a thickness increasing as the light incident portion extends away from a center of the plate body. In addition, the light incident portion has a top surface connected to the top plate surface and lifted from the top plate surface to include an angle with the top plate surface. The top surface includes a first incline and a second incline, wherein the first incline connects to a side of the top plate surface and has a first average slope. The second incline has a side connected to a side of the first incline opposite to the top plate surface and has a second average slope larger than the first average slope.