Optical Film Assembly with Light Conversion Layer for Wide Viewing Angle
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Solution Overview
Problem
Liquid crystal displays (LCDs) suffer from limited wide viewing angles, causing color shifts and potential black or white images when viewed from different positions, especially as screen size increases.
Innovation Solution
An optical film assembly with a light conversion layer containing quantum dot and/or phosphor materials, laminated to a first optical film with a functional layer, enhances light scattering to increase the light emission angle of the backlight module, achieving a wider viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional backlight module is used, then the display device can be manufactured with standard components, but the viewing angle is limited and color shifts occur when viewed from different positions
Solution Approach 1:
The patent changes the physical parameters of the light conversion layer by optimizing the concentration of quantum dot material (0.1-10 wt%) and film thickness (50-200 μm) to enhance light scattering and achieve wide viewing angle performance while maintaining color consistency across different viewing positions
Solution Approach 2:
The patent uses composite light conversion materials including quantum dot materials and/or phosphor materials combined with specific resins to create a light conversion layer that provides both wide viewing angle and accurate color representation, resolving the contradiction between adaptability and manufacturing precision
2Area of stationary object
If the screen size of LCD increases, then the display area is enlarged, but the possibility of laterally watching the screen increases and viewing angle problems become more prominent
Solution Approach 1:
The patent optimizes the light conversion layer parameters (material concentration and film thickness) to enhance light scattering effects, which effectively widens the viewing angle and maintains color consistency even for large-sized displays where lateral viewing is more common
3Power
If the concentration of quantum dot material and/or phosphor material is increased, then the light conversion efficiency is improved, but the film thickness and material distribution control becomes more difficult
Solution Approach 1:
The patent establishes optimized parameter ranges for quantum dot material concentration (0.1-10 wt%) and film thickness (50-200 μm) that achieve high light conversion efficiency while remaining manufacturable, balancing performance requirements with manufacturing precision capabilities
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 improves the display device's viewing angle, maintaining original color representation across various positions and enhancing display quality with a contrast ratio greater than 1500:1 and a color temperature under 16000K.
Implementation Method 1
The light conversion layer receives a first light and converts the first light to at least a second light to emit. The light conversion layer includes a quantum dot material and/or a phosphor material
Implementation Method 2
the light conversion layer could enhance the light scattering to increase the light emission angle of the backlight module, such that the display device with the backlight module could achieve the wide viewing angle
Data Source
AI summary
The invention provides an optical film assembly, a backlight module, and a display device. The backlight module includes a light source emitting at least a first light, a first optical film, and a second optical film laminated to the first optical film, wherein the first optical film includes a base film and a functional layer stacking up to the base film, the functional layer is a diffusion film, a brightness enhancement film, a reflection film, or a prism film, the second optical film is a light conversion layer, the light conversion layer receives the first light and converts the first light to a second light to emit, such that a light emission angle of the backlight module matches a requirement of wide viewing angle. The invention could broaden the light emitting angle of the backlight module to make the display device with the backlight module achieve wide viewing angle.