Integrated Optical Sheet Member for Display Brightness and Color
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Solution Overview
Problem
Current optical sheet members for liquid crystal display devices face challenges in reducing manufacturing costs, integrating functions to enhance light utilization rate and color reproducibility, while minimizing the number of components and interface reflection losses, and eliminating defects due to foreign substances.
Innovation Solution
An optical sheet member configuration incorporating a polarizing plate, an optical conversion member, and a brightness enhancement film with a reflection polarizer, utilizing quantum dots or phosphor materials to convert blue light into green and red light, and UV light into blue, green, and red, with a narrowband emission peak, to improve front brightness, contrast, and color reproduction while reducing color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical members (polarizing plate, brightness enhancement film, optical conversion member) are combined to improve light utilization and color reproduction, then brightness and color reproducibility are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the optical conversion member and brightness enhancement film into a single integrated optical sheet member. The optical conversion member contains quantum dots or phosphors for wavelength conversion, while the brightness enhancement film includes reflection polarizers and light scattering particles. By merging these functions into one component, the patent reduces the total number of optical members in the display stack, simplifying manufacturing and reducing assembly complexity while maintaining improved brightness and color reproduction performance.
2Loss of energy
If multiple optical members are combined to enhance light utilization rate, then brightness is improved, but manufacturing cost increases due to more members
Solution Approach 1:
The patent integrates multiple optical functions into a single optical sheet member, combining the optical conversion member (with quantum dots or phosphors for wavelength conversion) and the brightness enhancement film (with reflection polarizers and light scattering particles). This integration reduces the number of separate components that need to be manufactured and assembled, thereby lowering manufacturing costs while maintaining high light utilization rates through the combined optical effects.
3Illumination intensity
If multiple optical members are laminated to improve optical performance, then brightness and color reproduction are enhanced, but the thickness of the optical sheet member increases
Solution Approach 1:
The patent merges the optical conversion member and brightness enhancement film into a single integrated optical sheet member with total thickness of 10 μm or less. The optical conversion member layer (5-15 μm thick containing quantum dots or phosphors) is combined with the brightness enhancement film layer (5-20 μm thick containing reflection polarizers and light scattering particles). This integration achieves high brightness and color reproduction performance while controlling the overall thickness to meet miniaturization requirements for modern displays.
4Manufacturing precision
If multiple optical members are combined to improve color reproducibility, then color accuracy is enhanced, but the number of interfaces increases causing more reflection losses
Solution Approach 1:
The patent combines the optical conversion member and brightness enhancement film into one integrated optical sheet member, reducing the number of interfaces between separate optical components. The integrated structure includes an optical conversion member layer with quantum dots or phosphors for accurate wavelength conversion, and a brightness enhancement film layer with reflection polarizers and light scattering particles for enhanced brightness. By eliminating the interface between these two separate members, the patent reduces reflection losses while maintaining improved color reproducibility.
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 enhances front brightness, contrast, and color reproduction while reducing color unevenness and the thickness of the optical sheet member, making it suitable for use in image display devices with UV or B narrowband backlights, and minimizes defects from foreign substances.
Implementation Method 1
utilizing quantum dots or phosphor materials to convert blue light into green and red light, and UV light into blue, green, and red
Implementation Method 2
utilizing quantum dots or phosphor materials to convert blue light into green and red light
Implementation Method 3
an optical sheet member in which, among incident light rays while vibrating in all directions, only light rays vibrating in a specific polarization direction are transmitted, and light rays vibrating in the other polarization direction are reflected
Data Source
AI summary
An optical sheet member includes a polarizing plate including a polarizer (A); an optical conversion member (D); and a brightness enhancement film including a reflection polarizer (B), wherein the brightness enhancement film has a reflection center wavelength range of 300 nm to 430, and the optical conversion member (D) converts a part or all of UV light which is transmitted through polarizer (B) and is incident on the optical conversion member (D), and has an emission center wavelength range of 300 nm to 430 nm and which has an emission center wavelength range of 430 nm to 480 nm, green light which has an emission center wavelength range of 500 nm to 600 nm, and red light which has an emission center wavelength range of 600 nm to 700 nm.