Wavelength Conversion Layer with Impact Absorption for Slim Displays
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Solution Overview
Problem
Conventional backlight units in LCDs face challenges in achieving high brightness uniformity and image quality due to thickness constraints and susceptibility to damage, particularly in direct-illumination types.
Innovation Solution
Incorporation of a wavelength conversion layer with impact-absorbing properties, utilizing quantum dots and acryl or urethane resins, to convert light wavelengths and provide protection against external impacts, allowing for improved optical characteristics and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-illumination type backlight unit is used to achieve high brightness, then brightness can be improved, but thickness increases to ensure brightness uniformity
Solution Approach 1:
The patent combines the wavelength conversion function and impact absorption function into a single integrated layer. The wavelength conversion layer contains quantum dots for color conversion while simultaneously incorporating impact-absorbing resins (acryl or urethane) to provide mechanical protection. This merging eliminates the need for separate protective layers, thereby reducing overall thickness while maintaining both optical performance and durability.
Solution Approach 2:
The wavelength conversion layer is designed to perform multiple functions simultaneously: (1) converting blue LED light to white light through quantum dots, (2) absorbing external impacts through elastic resins, and (3) preventing scratches on the display surface. This multi-functionality allows the single layer to replace what would traditionally require multiple separate components, thus reducing thickness while achieving high brightness and uniformity.
2Length of stationary object
If the wavelength conversion layer is made thinner to reduce display device thickness, then thickness is improved, but susceptibility to damage increases
Solution Approach 1:
The wavelength conversion layer employs a composite material structure combining quantum dots (for wavelength conversion) with impact-absorbing resins such as acryl or urethane (for mechanical protection). This composite formulation enables the thin layer to simultaneously achieve optical functionality and mechanical durability, preventing damage without requiring increased thickness.
Solution Approach 2:
The impact-absorbing resins are incorporated into the wavelength conversion layer in advance to provide proactive protection against external impacts and scratches. This beforehand cushioning mechanism allows the thin layer to resist damage before it occurs, maintaining reliability without compromising thickness reduction goals.
3Ease of manufacture
If conventional backlight units are used, then manufacturing is simpler, but image quality deteriorates due to thickness constraints and susceptibility to damage
Solution Approach 1:
By merging wavelength conversion and impact absorption into a single layer, the patent maintains manufacturing simplicity (avoiding assembly of multiple separate layers) while achieving superior image quality through reduced thickness and enhanced protection against damage that would degrade display performance.
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 enhances image quality by converting light wavelengths, providing high scratch resistance, and enabling a slim, cost-effective display device design while preventing damage and image degradation.
Implementation Method 1
a wavelength conversion layer to convert a wavelength of an incident light
Implementation Method 2
a quantum dot bar having a plurality of quantum dots, which can convert blue light into red light or green light when receiving the blue light
Data Source
AI summary
A display device has a backlight unit and a display panel on the backlight unit. The backlight unit has a bottom cover, a light guide plate on the bottom cover, a reflective sheet under the light guide plate, a printed circuit board disposed at one lateral side of the light guide plate, a plurality of light emitting diodes mounted on the printed circuit board, and two or more optical sheets including a wavelength conversion sheet, wherein the wavelength conversion sheet has a lower substrate, an upper substrate on the lower substrate, a wavelength conversion layer between the lower substrate and the upper substrate, a lower anti-reflective layer under the wavelength conversion layer, a lower impact absorbing layer under the lower substrate, and an upper impact absorbing layer on the upper substrate.