Optical Multilayer Film for Backlight Module Assembly
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Solution Overview
Problem
Conventional backlight modules face issues with unstable optical characteristics and complex assembly due to the lack of structural support between brightness enhancement and diffuser films, leading to variable air gaps and potential dust ingress, which degrades optical performance.
Innovation Solution
An optical multilayer film comprising first and second optical layers with a refracting layer in between, made from transparent materials with specific refractive indices, providing a stable and integrated structure that enhances luminance brightness by converging off-axis light beams and simplifies assembly by eliminating the need for separate film handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a tiny air gap is left between the brightness enhancement film and the diffuser film to enhance light directing ability, then the refraction characteristic is improved, but the air gap width varies easily due to film deformation and the assembly becomes complex
Solution Approach 1:
The patent merges the brightness enhancement film and diffuser film into a single integrated optical multilayer film structure. The diffuser layer and brightness enhancement layer are combined with a refracting layer between them, eliminating the need for separate assembly and maintaining a stable air-like gap while improving luminance brightness through integrated light directing and diffusing functions.
2Ease of manufacture
If no structural support or coupling means is present between the films, then the assembly is simple, but the air gap width varies easily due to film deformation
Solution Approach 1:
The patent combines multiple optical films into a single integrated structure where the refracting layer is formed between the diffuser layer and brightness enhancement layer. This integration provides structural support that maintains stable air gap width while keeping the manufacturing process simple through one-step formation of the complete optical assembly.
Solution Approach 2:
The refracting layer acts as an intermediary between the diffuser layer and brightness enhancement layer, providing both structural support to maintain stable air gap width and optical function to enhance light directing. This intermediary layer prevents direct contact between the optical films while maintaining positional stability.
3Adaptability or versatility
If the films are assembled separately in different steps, then the assembly flexibility is maintained, but dust can enter the air gap and degrade optical characteristics
Solution Approach 1:
The patent merges the assembly process into a single step where the integrated optical multilayer film is formed as one complete unit. This eliminates multiple assembly steps and prevents dust from entering the air gap between optical layers, while the integrated structure maintains the necessary optical functions and adaptability.
4Volume of moving object
If the air gap disappears due to direct contact between films, then the structure becomes more compact, but the refraction characteristic deteriorates
Solution Approach 1:
The refracting layer serves as an intermediary that maintains a stable air-like gap between the diffuser layer and brightness enhancement layer. This prevents direct contact that would eliminate the air gap, thereby preserving the refraction characteristic necessary for light directing, while the integrated structure keeps the overall module compact.
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 optical multilayer film stabilizes optical characteristics, increases luminance brightness, and simplifies the assembly process by maintaining a consistent air-like refracting layer, preventing dust ingress and enhancing the overall performance of the backlight module.
Implementation Method 1
The refracting layer is disposed between and is in contact with the first and second optical layers, is made from a transparent material, and has a refractive index that is smaller than that of the second optical layer
Data Source
AI summary
An optical multilayer film includes first and second optical layers, and a refracting layer. The first optical layer has a light-exit surface. The second optical layer has a light-incoming surface facing the light-exit surface of the first optical layer, and a light-outgoing surface opposite to the light-incoming surface and formed with a light-converging structure. The refracting layer is disposed between and is in contact with the first and second optical layers, is made from a transparent material, and has a refractive index that is smaller than that of the second optical layer.