Base Film-Free Optical Sheet for High-Temperature Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid-crystal display devices rely on backlights and optical members with base films that deteriorate at high temperatures, leading to reduced luminance uniformity and efficiency in light emission.
Innovation Solution
An optical member comprising a light guide plate with an optical sheet having a first pattern and an adhesive layer, where the optical sheet is directly formed on the adhesive layer without a base film, enhancing light refraction and emission while maintaining luminance uniformity even in high temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an optical member with a base film is used to improve light directionality, then light emission efficiency is improved, but haze increases and luminance uniformity deteriorates due to base film deterioration at high temperatures
Solution Approach 1:
The patent removes the base film from the optical member structure. The optical sheet is directly formed on the adhesive layer without requiring a base film for support, thereby eliminating the source of haze and luminance uniformity deterioration while preserving the light directionality improvement function
Solution Approach 2:
Instead of using a base film to support the optical sheet (conventional approach), the patent inverts the structure by having the optical sheet directly adhere to the adhesive layer, which then bonds to the light guide plate. This inversion eliminates the base film while maintaining structural integrity
2Use of energy by moving object
If an optical member with a base film is used to improve light directionality, then light emission efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The base film is extracted from the manufacturing process. The optical sheet is directly formed and bonded to the adhesive layer without the intermediate base film step, simplifying the manufacturing process while maintaining light emission efficiency
Solution Approach 2:
The patent merges the optical sheet and adhesive layer into a directly bonded structure, eliminating the separate base film component. This consolidation reduces the number of manufacturing steps and simplifies the overall process
3Use of energy by moving object
If an optical member with a base film is used to improve light directionality, then light emission efficiency is improved, but material costs and manufacturing costs increase
Solution Approach 1:
The base film material is extracted from the composition. By eliminating this unnecessary material layer, the patent reduces material costs while preserving the light directionality function through the direct bonding of optical sheet to adhesive layer
Solution Approach 2:
The patent eliminates the need for expensive base film materials by using a simpler direct bonding structure. The adhesive layer itself serves the bonding function without requiring additional costly base film materials
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 light emission efficiency and maintains luminance uniformity by eliminating the base film, simplifying the manufacturing process and reducing costs, and effectively addressing the issue of film deterioration at high temperatures.
Implementation Method 1
the optical pattern may refract the light traveling by total reflection within the light guide plate and the optical sheet so that it travels toward the display panel
Implementation Method 2
the optical pattern may refract the light traveling by total reflection within the light guide plate and the optical sheet
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided are an optical member, a display device including the same, and method for fabricating the optical member. The optical sheet includes an adhesive layer; and an optical pattern in contact with a first surface of the adhesive layer; and a release film in contact with a second surface of the adhesive layer, opposite to the first surface, wherein the optical pattern comprises a first pattern extending in a first direction, and a plurality of second patterns formed on the first pattern, wherein the first pattern comprises peak portions having a largest thickness and depressed portions having a smallest thickness, and the adhesive layer comprises a third pattern of recesses respectively aligned with the depressed portions of the first pattern, and a fourth pattern of recesses respectively aligned with the plurality of second patterns.