Dual-Layer Prism Sheet for LCD Luminance
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Solution Overview
Problem
Existing liquid crystal displays face a challenge in maintaining luminance and contrast due to the removal of optical sheets from the backlight unit, which leads to deteriorated light rectilinear propagation and reduced image quality.
Innovation Solution
A dual-layer prism sheet with a polymeric adhesive and lubricant is introduced, featuring patterns on each sheet that are bonded at a specific angle to enhance light transmission and reduce surface damage, thereby improving luminance and contrast in liquid crystal displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical sheets are removed from the backlight unit to reduce manufacturing cost, then manufacturing cost decreases, but rectilinear propagation property of light deteriorates resulting in drop in luminance or contrast
Solution Approach 1:
The optical sheet is divided into two separate prism sheets with different patterns (first pattern and second pattern) that are bonded together. This segmentation allows each sheet to perform specific optical functions while maintaining overall performance, resolving the contradiction between cost reduction and optical performance maintenance
Solution Approach 2:
The invention uses a composite structure of two different prism sheets bonded together with an adhesive layer. This composite material approach creates a new optical system that maintains superior light rectilinear propagation properties while being more cost-effective than using a single complex optical sheet
2Object-affected harmful factors
If adhesive layer contains lubricant to prevent surface damage, then surface damage decreases, but adhesion strength may be compromised
Solution Approach 1:
The adhesive layer's composition parameters are precisely controlled, containing lubricant in a specific amount (greater than 0 wt% and equal to or less than 30 wt%). This parameter optimization ensures sufficient lubrication to prevent surface damage while maintaining adequate adhesion strength between the prism sheets
Solution Approach 2:
The adhesive layer acts as an intermediary between the two prism sheets, containing lubricant that prevents direct contact and potential damage between the sheets while still providing sufficient bonding. The lubricant mediates the interaction to be gentle yet effective
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 dual-layer prism sheet structure enhances light rectilinear propagation, increasing luminance and contrast by minimizing surface damage and optimizing light alignment with the liquid crystal panel, resulting in improved image quality.
Implementation Method 1
an adhesive layer interposed between the upper prism sheet and the lower prism sheet to bind the upper prism sheet and the lower sheet with each other
Implementation Method 2
The adhesive layer includes a polymeric adhesive and an amount more than 0 wt % and equal to or less than 30 wt % of a lubricant
Implementation Method 3
a prism sheet includes an upper prism sheet having a first pattern on one surface thereof, a lower prism sheet having a second pattern on one surface thereof
Implementation Method 4
The first pattern and the second pattern may be formed to have various shapes. For example, the patterns include a plurality of vertically and horizontally arranged quadrangular pyramids
Data Source
AI summary
Disclosed is a dual layer prism sheet including two patterned prism sheets adhered to each other with an adhesive layer interposed therebetween. The adhesive layer includes a polymeric adhesive and a lubricant. A liquid crystal display including the dual layer prism sheet is also disclosed. Each pattern on the prism sheet is arranged to make a predetermined angle with a liquid crystal panel.