Quantum Rod Sheet for Backlight Unit Cost Reduction
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Solution Overview
Problem
The high manufacturing costs of display devices, particularly due to the expensive optical sheets used in backlight units, which are necessary for improving luminance and uniform light distribution, need to be reduced.
Innovation Solution
A quantum rod sheet is introduced, comprising a support layer with grooves and quantum rods arranged in a predetermined direction, which acts as a polarizing element to replace the expensive optical sheets, utilizing a light source that emits specific wavelengths such as ultraviolet or blue light, and optionally includes protective layers and crystalline polymer layers to enhance light polarization and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If expensive optical sheets are used to improve luminance and uniform light distribution in backlight units, then light distribution quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the polarization function from traditional expensive optical sheets and implements it using quantum rods embedded in a polymer matrix. This creates a cost-effective alternative that maintains the essential light distribution functionality while eliminating the need for costly conventional optical components.
Solution Approach 2:
The invention uses a composite material system consisting of quantum rods dispersed in a polymer matrix. This composite structure combines the optical polarization properties of quantum rods with the structural benefits of the polymer, creating a functional material that replaces multiple separate optical components and reduces overall manufacturing cost.
2Stability of the object's composition
If multiple optical sheets are used to achieve uniform light distribution, then light distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple optical functions (polarization, light distribution) into a single integrated quantum rod sheet component. This consolidation eliminates the need for stacking multiple separate optical sheets, thereby reducing device complexity while maintaining uniform light distribution through the quantum rods' inherent optical properties.
3Illumination intensity
If traditional phosphor-based LED light sources are used to generate white light, then white light output is achieved, but manufacturing cost and energy efficiency are reduced
Solution Approach 1:
The patent changes the fundamental parameter of light generation from phosphor-based wavelength conversion to direct quantum rod emission. By utilizing quantum rods' size-tunable optical properties, the system can generate desired wavelengths directly, eliminating the need for phosphor materials and associated manufacturing complexities while improving energy efficiency and reducing costs.
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
This solution reduces manufacturing costs by eliminating the need for expensive optical sheets and enhances light polarization efficiency, allowing for effective light distribution and image display in display devices like LCDs, while maintaining transparency and light transmittance.
Implementation Method 1
a quantum rod sheet which receives and polarizes the light provided from the light source
Data Source
AI summary
A quantum rod sheet includes: a first support layer including a plurality of grooves which extends substantially in a predetermined direction; a plurality of quantum rods arranged substantially in the predetermined direction along the grooves of the first support layer; and a second support layer which covers the first support layer and the quantum rods.