Integrated Polarizer Film with Embedded Diffusion Layer for Thin LCDs
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face challenges in achieving a thinner thickness while maintaining even luminance and preventing defects like moiré and rainbow mura patterns due to the thickness of optical sheets and air layers, which degrade light efficiency and cause uneven brightness.
Innovation Solution
An ultra-thin LCD structure is achieved by embedding a light diffusion layer into the lower polarizer film and laminating a prism sheet with varying pitch patterns, eliminating the need for separate diffusion films and air layers, and integrating the polarizer and prism sheets as a single optical sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If separate diffusion films and air layers are used in the LCD structure, then light diffusion function is provided, but the thickness of the LCD increases and light efficiency degrades
Solution Approach 1:
The patent combines the light diffusion layer with the lower polarizer film into a single integrated structure. The lower polarizer film serves dual functions: polarizing light and diffusing light through embedded diffusion particles. This merging eliminates the need for separate diffusion films and air layers, thereby reducing overall LCD thickness while maintaining light diffusion functionality and improving light efficiency by removing unnecessary interfaces that cause reflection and scattering.
2Illumination intensity
If optical sheets are combined to enhance uniformity and convergence, then luminance uniformity is improved, but the thickness of the LCD increases
Solution Approach 1:
The patent integrates the light diffusion function into the lower polarizer film itself, eliminating the need for separate diffusion sheets. The lower polarizer film contains embedded diffusion particles that provide light scattering functionality. Additionally, the prism sheet is designed with varying pitch patterns to enhance light convergence and uniformity. This integration approach achieves improved luminance uniformity while minimizing thickness increase.
Solution Approach 2:
The patent employs a prism sheet with non-uniform pitch distribution, where the pitch varies in different regions to optimize light convergence characteristics. The varying pitch allows for localized control of light paths, enhancing luminance uniformity across different viewing angles and positions without requiring additional thick optical layers.
3Loss of energy
If air layers are maintained between optical sheets, then light scattering is reduced, but thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent eliminates air layers by integrating the light diffusion layer directly into the lower polarizer film structure. The diffusion particles are embedded within the polarizer film matrix, creating a solid-state diffusion mechanism that eliminates the need for air gaps. This integration simplifies the manufacturing process by reducing the number of assembly steps and interfaces, while maintaining effective light diffusion without excessive scattering losses.
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
This approach results in a significantly thinner LCD with improved light diffusion and reduced defects, enhancing luminance uniformity and preventing moiré and rainbow mura patterns, while maintaining high light efficiency.
Implementation Method 1
embedding a light diffusion layer into the lower polarizer film
Implementation Method 2
laminating the prism sheet onto the lower polarizer film
Data Source
AI summary
The present disclosure relates to an integrated polarizer film and a liquid crystal display integrated with the same polarizer film. The liquid crystal panel according to the present disclosure comprises: a liquid crystal panel; an upper polarizer film having a first light transmission axis and disposed on a top surface of the liquid crystal panel; a light diffusion layer embedded lower polarizer film having a second light transmission axis and disposed on a bottom surface of the liquid crystal panel; and an upper prism sheet laminated under the bottom surface of the light diffusion layer embedded lower polarizer film by a low refractive adhesive layer, and including a prism pattern having a first prism pattern and a second prism pattern smaller than the first prism pattern, wherein topmost portions of the first prism pattern are immersed into the low refractive adhesive layer, wherein the upper prism sheet is combined with the light diffusion layer embedded lower polarizer film, and wherein an air layer is inserted between the low refractive adhesive layer and the second prism pattern.