Optical Sheet with Adhesive Protrusions for LCD Backlight Uniformity
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Solution Overview
Problem
Conventional backlight modules for liquid crystal displays (LCDs) face challenges in achieving uniform luminance and enhancing optical properties, leading to unsatisfactory light collection efficiency and surface defects.
Innovation Solution
An optical sheet comprising a first prism sheet with parallel prisms, a diffusion sheet with protrusions, and a second prism sheet with orthogonal prisms, where the second protrusions are taller and narrower, forming an air layer and minimizing contact area to enhance light diffusion and luminance, and featuring adhesive irregularities for improved adhesion and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional diffusion sheet and prism sheet structure is used, then light diffusion is achieved, but luminance is insufficient and surface spots appear
Solution Approach 1:
The optical sheet is segmented into multiple functional layers: a first prism sheet with first prisms, a diffusion sheet with first protrusions, and a second prism sheet with second prisms. Each layer performs a specific optical function (light collection, diffusion, and light collection in orthogonal direction), allowing the system to achieve high luminance while maintaining structural organization and managing complexity through functional decomposition.
2Reliability
If the diffusion sheet contacts the prism sheet directly, then adhesion is achieved, but surface stains and spots occur
Solution Approach 1:
A second protrusion made of adhesive material serves as an intermediary between the diffusion sheet and the first prism sheet. This adhesive protrusion provides reliable adhesion while minimizing the contact area, thereby preventing surface stains and spots from forming on the optical sheet while maintaining the bond between layers.
3Strength
If contact area between diffusion sheet and prism sheet is increased, then adhesion strength is improved, but surface uniformity deteriorates
Solution Approach 1:
The adhesive material is applied in a localized second protrusion rather than across the entire contact surface. This local quality approach provides sufficient adhesion strength at the specific adhesive contact points while maintaining surface uniformity and preventing stains in the non-contact areas, thus resolving the contradiction between adhesion strength and surface uniformity.
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 significantly increases luminance, minimizes surface stains, and enhances optical properties by optimizing light collection and diffusion, while preventing bending of the prism sheet and reducing contact area for improved uniformity and efficiency.
Implementation Method 1
An air layer is formed in a gap between the first protrusion and the first prism sheet, between the diffusion sheet and the first prism sheet
Implementation Method 2
a first prism sheet which has a plurality of prisms parallel in a first direction formed on one surface thereof; and a second prism sheet which is positioned at a surface side to which the light of the first prism sheet is emitted, and has a plurality of prisms parallel in a second direction crossing the first direction
Implementation Method 3
a diffusion sheet which is positioned at a surface side into which light of the first prism sheet is incident, and has a plurality of protrusions formed on a surface facing the first prism sheet
Implementation Method 4
The second protrusion is made of an adhesive material and is formed to adhere and fix the first prism sheet and the diffusion sheet
Data Source
AI summary
The present disclosure relates to an optical sheet having improved optical properties and minimized surface spots. According to one aspect of the present disclosure, provided is an optical sheet comprising: a first prism sheet which has a plurality of prisms parallel in a first direction formed on one surface thereof; and a diffusion sheet which is positioned at the surface side into which light of the first prism sheet is incident and has a plurality of protrusions formed on the surface facing the first prism sheet.