Optical Laminated Sheet with Adhesive Roughness for Backlight Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing laminated optical sheets used in backlight units for LCD panels face challenges in reducing thickness while minimizing the occurrence of interference fringes and rainbow-like colors, which are exacerbated by the use of multiple condensing films with prism rows that increase thickness and complexity, and previous solutions involving light transmission diffusion layers with fine particles are costly and prone to damage.
Innovation Solution
A laminated optical sheet with a smooth surface and a rough surface featuring spherical convex portions formed by an adhesive layer, where the rough surface is bonded to the prism rows, diffuses light to prevent interference fringes and rainbow-like colors without using fine particles, thereby reducing thickness and improving handling and cost efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple condensing films with prism rows are laminated to improve brightness, then luminance is enhanced, but the total thickness of the backlight unit increases
Solution Approach 1:
The invention integrates two condensing films with different prism row orientations (first condensing film with vertical prism rows, second condensing film with horizontal prism rows) into a single laminated structure. This merging approach consolidates the light-collecting functions of multiple films while maintaining a controlled total thickness through the use of thin adhesive layers, thereby enhancing luminance without proportionally increasing overall thickness.
2Illumination intensity
If multiple condensing films are laminated to improve brightness, then luminance is enhanced, but the number of assembly steps increases and handling becomes more difficult
Solution Approach 1:
The invention combines two condensing films into a single laminated unit that can be handled and assembled as one integrated component. This reduces the number of separate assembly steps required compared to installing multiple independent condensing films, thereby improving ease of operation and reducing the risk of damage during assembly while maintaining the brightness enhancement benefits.
3Object-generated harmful factors
If a light transmission diffusion layer with fine particles is used to suppress interference fringes, then rainbow-like colors are reduced, but cost increases and the structure becomes more fragile
Solution Approach 1:
The invention extracts and eliminates the need for light transmission diffusion layers containing fine particles by using an alternative approach: laminating two condensing films with different prism row orientations. This structural solution suppresses interference fringes and rainbow-like colors through optical geometry rather than particle-based diffusion, thereby reducing manufacturing cost and avoiding the fragility associated with particle-containing layers.
Solution Approach 2:
The invention replaces expensive and fragile particle-based diffusion layers with a more economical and durable solution using standard condensing film materials and adhesive layers. This substitution maintains the optical function of suppressing interference fringes while using simpler, more cost-effective, and more robust materials that are easier to manufacture and handle.
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 effectively eliminates or reduces interference fringes and rainbow-like colors while maintaining brightness enhancement and improving handling ability, simplifying the manufacturing process and reducing costs.
Implementation Method 1
the rough surface is shaped by transferring... diffuses light to prevent interference fringes and rainbow-like colors
Implementation Method 2
the area by which the light incident from the lower surface is refracted and condensed, reducing the brightness enhancement effect
Data Source
AI summary
The present invention provides a thin optical laminated sheet with little or no interference fringes or rainbow-like colors, and a method of manufacturing the optical laminated sheet. An optical laminated sheet is integrally formed by laminating a plurality of optical films having an adhesive layer interposed therebetween, the optical laminated sheet including an adhesive layer A wherein one surface is a flat and smooth surface and the opposite surface has an unevenness shaped by a transfer. The optical laminated sheet may include an integrally formed laminate wherein one surface of the adhesive layer A is planarly bonded to one surface of the optical film and an uneven surface that is the other surface of the adhesive layer A is linearly and/or intermittently bonded to the prism edges of a light collecting film made up of prism rows. The optical laminated sheet may be used in a backlight unit.