Backlight Optical Sheet with Shape Memory Material for Wrinkle Control
Solution Overview
Problem
Display apparatuses face issues with wrinkling of optical sheets due to external factors like temperature and humidity, affecting the uniformity and quality of light transmission.
Innovation Solution
Incorporating shape memory materials, such as shape memory alloys or polymers, into the optical sheets of the backlight unit to prevent wrinkling by utilizing materials like Nitinol, which can recover their original shape when heated, thus maintaining optimal light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical sheets are used in the backlight unit, then the structure is simple and cost-effective, but the optical sheets become wrinkled due to external factors such as temperature or humidity, affecting light transmission uniformity
Solution Approach 1:
The patent applies parameter changes by utilizing the phase transition properties of shape memory materials. When temperature changes occur, the shape memory material transitions between martensitic and austenitic phases, automatically adjusting its shape to counteract wrinkles caused by thermal or humidity variations. This dynamic parameter adjustment resolves the contradiction by maintaining optical sheet flatness without adding complex mechanical structures.
Solution Approach 2:
The patent employs composite materials by integrating shape memory alloys or polymers with the optical sheet material. This composite structure combines the optical properties of the sheet material with the shape recovery capabilities of the shape memory material, creating a unified component that resists wrinkling while maintaining simplicity in overall device structure.
2Adaptability or versatility
If shape memory materials are incorporated into optical sheets to prevent wrinkling, then resistance to temperature and humidity changes is improved, but material selection and manufacturing complexity increase
Solution Approach 1:
The patent utilizes parameter changes by selecting shape memory materials with specific transition temperatures matched to the operating conditions. By controlling the phase transition parameters of the shape memory material, the optical sheet can adapt to temperature changes within a specific range, providing targeted adaptability without requiring complex manufacturing processes for broader temperature ranges.
3Reliability
If shape memory materials are used in the optical sheet, then wrinkling phenomenon is reduced, but the cost of materials and manufacturing increases
Solution Approach 1:
The patent applies local quality by strategically positioning shape memory materials only in specific regions of the optical sheet where wrinkling is most likely to occur, such as edges or areas prone to thermal stress. This localized application reduces the overall amount of expensive shape memory material required, thereby lowering manufacturing costs while maintaining optical sheet stability in critical areas.
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 use of shape memory materials effectively reduces wrinkling of optical sheets, ensuring uniform light distribution and maintaining image quality by adjusting to temperature changes, preventing visual abnormalities on the display screen.
Implementation Method 1
the optical sheet includes a plurality of sheets, and includes a shape memory material on at least one of the plurality of sheets
Implementation Method 2
Incorporating shape memory materials, such as shape memory alloys or polymers, into the optical sheets of the backlight unit to prevent wrinkling by utilizing materials like Nitinol, which can recover their original shape when heated
Data Source
AI summary
An aspect of the present disclosure provides a backlight unit with improved wrinkled phenomenon of optical sheet due to external factors such as temperature or humidity, and a display apparatus including the same. The display apparatus according to an embodiment includes: a backlight unit comprising an optical sheet; and an image forming unit configured to generate an image by transmitting or blocking light emitted from the backlight unit, and the optical sheet includes a plurality of sheets, and comprises a shape memory material in at least one of the plurality of sheets.