Stacked Light Guide Plates for Bright, Ripple-Free Backlighting
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Solution Overview
Problem
Conventional backlight modules suffer from low efficiency, insufficient brightness, excessive power consumption, and the occurrence of projected water ripple phenomena, particularly in automotive and industrial displays, due to large light exit angles and low light utilization.
Innovation Solution
A backlight module design utilizing multiple stacked light guide plates with V-cut structures and a deflecting film, where light-emitting elements are aligned along the light-incident surfaces, allowing controlled light exit angles and enhanced directionality through prisms and microstructures, combined with a deflecting film to guide light towards a normal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional architecture with diffusion sheet, prism sheet, and anti-peeping sheet is used, then viewing angle convergence and anti-peeping effects are achieved, but light utilization is low and brightness is insufficient
Solution Approach 1:
The patent divides the light guide plate into multiple sections with different light guide structures (V-cut structures, prism structures, microstructures) at different regions. This segmentation allows different parts of the light guide plate to control light in different ways, improving overall light utilization while maintaining brightness and anti-peeping effects.
Solution Approach 2:
The patent applies different light guide structures (V-cut, prism, microstructures) at different locations on the light guide plate. Each structure is optimized for its specific location to control light direction and distribution, thereby improving light utilization efficiency while maintaining the required brightness and viewing angle properties.
2Ease of operation
If light guide plates with V-cut are used, then light directionality is improved, but projected water ripple phenomenon occurs on the light entry side
Solution Approach 1:
The patent combines multiple light guide structures (V-cut structures, prism structures, and microstructures) into a single integrated light guide plate design. This merging of different structural elements allows the system to achieve good light directionality while eliminating the projected water ripple phenomenon that occurs with V-cut alone.
Solution Approach 2:
The patent uses a composite light guide structure incorporating different types of optical elements (V-cut grooves, prism structures, microstructures) within the same light guide plate. This composite approach leverages the advantages of each structure type while mitigating their individual disadvantages, particularly eliminating water ripple effects.
3Loss of energy
If multiple light guide plates with complex structures are used, then light utilization and directionality are improved, but device complexity increases
Solution Approach 1:
The patent designs the light guide plate structures (V-cut, prism, microstructures) to serve multiple functions simultaneously: controlling light direction, distributing light uniformly, and eliminating optical defects like water ripple phenomena. This multi-functionality reduces the need for separate components, thereby improving light utilization without proportionally increasing device complexity.
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 design achieves high light utilization, maintains brightness, and eliminates projected water ripple phenomena while providing viewing angle convergence and anti-peeping capabilities.
Implementation Method 1
each light guide plate includes a light-incident surface, a light exit surface, a bottom surface, and a light guide structure. The light guide structure is formed on the bottom surface.
Implementation Method 2
The plurality of light guide plates are stacked, and each light guide plate includes a light-incident surface, a light exit surface, a bottom surface, and a light guide structure.
Implementation Method 3
The deflecting film is disposed on the plurality of light guide plates.
Data Source
AI summary
A backlight module includes stacked light guide plates, a light source module, and a deflecting film. Each light guide plate has a light-incident surface, a light exit surface, a bottom surface, and a light guide structure. The light exit surface and the bottom surface are placed on two opposite sides of the light guide plate and both connected to the light-incident surface, and the light guide structure is formed on the bottom surface. The light-incident surfaces are placed on a light entry side and arranged along a stacking direction. The light source module is disposed on the light entry side and includes light-emitting elements. The light-emitting elements are arranged in a single line along the light-incident surface of each light guide plate, and each light-emitting element has a light emitting surface facing the light-incident surfaces of the plurality of light guide plates.