Backlight Module with Absorptive Polarizer for View Angle Switching
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Solution Overview
Problem
Conventional LCDs with switchable view angles often compromise on luminance, image contrast, or image quality during the switching process, and have unsatisfactory optical efficiency.
Innovation Solution
A light source module comprising a first and second backlight module, a turning film with reverse prisms, and an absorptive polarizer film, where the included angle between the polarizing transmission axes of the absorptive polarizer and polarizer films ranges from 0 to 60 degrees, allowing for effective stray light filtration and maintaining light emitting quality across different view angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LCDs use switchable view angle technology, then the view angle can be adjusted between wide and narrow modes, but the luminance, image contrast, or image quality is compromised during switching
Solution Approach 1:
The backlight unit is divided into multiple independent backlight modules (first backlight module with first light source and first LGP, second backlight module with second light source and second LGP), each capable of independent operation. This segmentation allows selective activation of different modules to achieve different view angle modes without compromising overall image quality or luminance stability.
Solution Approach 2:
An absorptive polarizer film is introduced as an intermediary component between the backlight modules and the display panel. This polarizer film with specific polarizing transmission axis orientation acts as a mediator to control light polarization and filter stray light, ensuring stable image quality and contrast during view angle switching while maintaining luminance levels.
2Adaptability or versatility
If conventional LCDs implement view angle switching, then adaptability between wide and narrow view modes is improved, but optical efficiency remains unsatisfactory
Solution Approach 1:
By segmenting the backlight into multiple independent modules, the system can activate only the necessary modules for each viewing mode, reducing unnecessary light emission and improving overall optical efficiency while maintaining view angle adaptability.
Solution Approach 2:
The absorptive polarizer film converts potentially harmful stray light into a beneficial control mechanism. By selectively absorbing unwanted polarization directions and transmitting only the desired light paths, the system improves optical efficiency while enabling view angle switching capability.
3Object-affected harmful factors
If the polarizing transmission axis angle is set to a specific range (0-60 degrees), then stray light filtration is improved, but device complexity increases
Solution Approach 1:
The absorptive polarizer film is designed with a specific parameter range for its polarizing transmission axis orientation (0-60 degrees relative to the light incident surface). This parameter optimization enables effective stray light filtration while maintaining manageable device complexity through standardized angular specifications.
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 ensures favorable light emitting quality and image quality in both narrow-view-angle and wide-view-angle display modes by minimizing the impact of stray light, without sacrificing luminance or image contrast.
Implementation Method 1
The first absorptive polarizer film has a first polarizing transmission axis... allows for effective stray light filtration
Implementation Method 2
The first absorptive polarizer film has a first polarizing transmission axis... included angle between an axial direction of the first polarizing transmission axis and an axial direction of the second polarizing transmission axis
Implementation Method 3
The first turning film includes a plurality of reverse prisms... extend along an extension direction
Data Source
AI summary
A light source module including a first backlight module, a second backlight module, a turning film, and a first absorptive polarizer film is provided. The first backlight module has a first side and a second side. The first backlight module includes a first light guide plate (LGP) having a first light incident surface and a first light source disposed beside the first light incident surface. The second backlight module is arranged at the second side. The second backlight module includes a second LGP having a second light incident surface and a second light source disposed beside the second light incident surface. The turning film is arranged at the first side. The turning film includes a plurality of reverse prisms. The reverse prisms extend along an extension direction. The first absorptive polarizer film is disposed between the first backlight module and the second backlight module. A display device is also provided.