Light Guide Plate Folded Surfaces Eliminate Firefly Phenomenon
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Solution Overview
Problem
Existing light guide plates in LCD devices suffer from the 'firefly phenomenon' due to less light sources, resulting in uneven light intensity and complex, costly solutions that fail to completely eliminate the issue.
Innovation Solution
A light guide plate design featuring folded surfaces with obtuse angles and strategically positioned light sources, increasing coupling efficiency and eliminating firefly phenomenon with uniform light intensity, while simplifying structure and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of light sources is reduced, then cost and energy consumption are reduced, but the firefly phenomenon becomes more apparent due to insufficient light mixing
Solution Approach 1:
The patent changes the geometric parameters of the light guide plate by introducing folded surfaces with obtuse angles, which alters the light propagation paths and improves light mixing efficiency, allowing fewer light sources to achieve uniform illumination
Solution Approach 2:
The patent introduces folded surfaces that add dimensional complexity to the light incident surfaces, creating multiple reflection and refraction paths that enhance light mixing without requiring additional light sources
2Illumination intensity
If conventional solutions are added to eliminate firefly phenomenon, then uniformity of light is improved, but structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent achieves uniform light distribution by changing the geometric parameters of the light guide plate structure (introducing folded surfaces with obtuse angles) rather than adding complex optical elements, thereby maintaining structural simplicity while improving illumination uniformity
3Illumination intensity
If conventional solutions are added to eliminate firefly phenomenon, then uniformity of light is improved, but manufacturing process becomes difficult and cost increases
Solution Approach 1:
The patent modifies the geometric parameters of the light guide plate (adding folded surfaces) which can be manufactured using standard molding processes, avoiding the need for complex assembly steps or specialized manufacturing techniques required by conventional solutions
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 provides uniform emergent light without firefly phenomenon, even with fewer light sources, reducing costs and energy consumption, and is suitable for large-size LCD devices.
Implementation Method 1
the refraction angle is smaller than the incident angle when the light 9 is emitted from the light sources into the light guide plate 1
Implementation Method 2
Light 9 is emitted from the light source 2 into the light guide plate 1, and subjected to series of reflections and refractions
Data Source
AI summary
A light guide plate, a backlight module and a display device both comprising the light guide plate are disclosed. The light guide plate comprises a light emitting surface and multiple side surfaces perpendicular to and connected to the light emitting surface, the side surfaces including at least one first side surface and at least one second side surface. The light guide plate further comprises at least one set of folded surfaces perpendicular to and connected to the light emitting surface. Each set of folded surfaces is connected between a pair of first side surface and second side surface which are adjacent with each other. Each set of folded surfaces includes multiple light incident surfaces which are connected one by one. In the light incident surfaces in same set of folded surfaces, any two adjacent light incident surfaces form an acute angle opened toward inside of the light guide plate.