Composite Prism Gap and Reflecting Layer for Backlight Brightening
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Solution Overview
Problem
Conventional composite prisms in backlight structures face issues with light refraction and convergence due to direct contact or small refractive index differences, leading to suboptimal brightening effects.
Innovation Solution
A composite prism design featuring a first and second prism sheet superimposed with a reflecting layer between them, allowing light to travel through a gap and be reflected back for effective convergence, enhanced by protrusions and an adhesive layer for stability and brightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two independent prisms are used in conventional backlight structure, then light refraction and convergence can be achieved, but the thickness becomes too large
Solution Approach 1:
The patent combines two independent prisms into a single composite prism structure where the first and second prism sheets are integrally formed as one piece. This merging reduces the overall thickness while maintaining the light refraction and convergence functions that would otherwise require separate prisms.
Solution Approach 2:
The composite prism is segmented into multiple functional regions: a first prism sheet with first protrusions, a second prism sheet with second protrusions, and a reflecting layer. This segmentation allows each region to perform specific optical functions while maintaining overall structural integration and reducing total thickness.
2Stability of the object's composition
If the first prism sheet and second prism sheet are in direct contact, then structural stability is improved, but light refraction effectiveness decreases due to small refractive index difference
Solution Approach 1:
The patent introduces a reflecting layer as an intermediary between the first and second prism sheets. This layer has a refractive index different from both prism sheets, creating effective refraction at the interfaces. The reflecting layer also reflects light back into the prism structure, enhancing light utilization while maintaining structural stability through adhesive bonding.
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 achieves high light use efficiency and brightness by ensuring effective light refraction and convergence, improving the overall brightening effect and stability of the composite prism.
Implementation Method 1
a reflecting layer disposed between a surface of the second prism sheet contacting the first prism sheet and configured to allow light irradiated from the second prism sheet to the first prism sheet to travel through the gap
Data Source
AI summary
A composite prism, a manufacturing method thereof, a backlight unit and a display device are provided. The composite prism includes: a first prism sheet and a second prism sheet superimposed on each other, a part of a first surface of the second prism sheet near the first prism sheet contacting the first prism sheet; a gap being formed between the other part of the first surface and the first prism sheet; and a reflecting layer disposed on the surface of the second prism sheet contacting the first prism sheet and configured to allow light irradiated from the second prism sheet to the first prism sheet to travel through the gap.