Display Device Chip Cover with Quantum Dot Light Conversion
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Solution Overview
Problem
Current display devices with backlight units face limitations in increasing the number of local dimming blocks and contrast ratio due to the expansion of the optical diffusion area, and they also suffer from increased thickness and production costs associated with using quantum dot sheets for improved color reproducibility.
Innovation Solution
A display device structure that incorporates a light source plate with quantum dot particles integrated into chip covers, which include a cover layer, a light conversion member, and a Distributed Bragg reflector (DBR) layer to convert light wavelengths without a quantum dot sheet, enhancing color reproducibility and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens is provided to cover a light source to widen the optical diffusion area, then the light distribution is improved, but the number of local dimming blocks is reduced
Solution Approach 1:
The patent divides the light source plate into multiple independently controllable light source regions instead of using a single lens-covered light source. This segmentation allows each region to function as a separate local dimming block, increasing the number of controllable zones while eliminating the need for a lens that would otherwise reduce the block count.
2Manufacturing precision
If a quantum dot sheet is provided at the rear of the display panel to improve color reproducibility, then the color accuracy is enhanced, but the thickness of the display device increases
Solution Approach 1:
The patent merges the quantum dot light conversion function directly into the light source plate structure by providing quantum dot layers on the light-emitting surfaces of the light emitting diodes. This integration eliminates the need for a separate quantum dot sheet, maintaining color reproducibility while reducing overall device thickness.
3Manufacturing precision
If a quantum dot sheet is used to improve color reproducibility, then the color accuracy is enhanced, but the production cost increases
Solution Approach 1:
The patent integrates the quantum dot light conversion function directly into the light source plate structure by providing quantum dot layers on the light-emitting surfaces of the light emitting diodes. This integration eliminates the need for a separate quantum dot sheet, maintaining color reproducibility while reducing overall device thickness.
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 increases the number of local dimming blocks, improves contrast ratio, maintains color reproducibility with reduced quantum dot usage, and decreases the display device's thickness and production costs by eliminating the need for a quantum dot sheet.
Implementation Method 1
a light conversion member, including light conversion material, configured to convert a wavelength of light emitted from the LED chip
Implementation Method 2
a Distributed Bragg reflector (DBR) layer configured to transmit long-wavelength based light and reflect short-wavelength based light to improve light conversion efficiency of the light conversion member
Data Source
AI summary
A display device may have a reduced thickness while having enhanced color reproducibility by having an improved structure. The display device may include: a liquid crystal panel; a light source plate which is arranged at the rear of the liquid crystal panel to provide light to the liquid crystal panel, and which includes a printed circuit board and an LED chip mounted on the printed circuit board; and a chip cover which is provided to cover a light-emitting surface of the LED chip, and which changes the wavelength of the light emitted from the LED chip, wherein the chip cover includes: a cover layer having a first surface arranged to face the light-emitting surface of the LED chip, a second surface opposite to the first surface, and an accommodating groove provided on the second surface; a light conversion member which changes the wavelength of the light emitted from the LED chip, and which is accommodated in the accommodating groove; and a barrier layer for covering the second surface to cover the light conversion member from the outside.