Quantum Dot Light Guide Layout for Thinner Local Dimming Displays
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Solution Overview
Problem
Conventional display apparatuses face limitations in improving contrast ratio and color reproducibility due to the expansion of the optical diffusion area caused by lenses, which reduces the number of local dimming blocks and increases thickness, and the use of quantum dot sheets for color improvement adds thickness and production costs.
Innovation Solution
A display apparatus design that includes a light source module with a light guide body, a light conversion member containing quantum dots, and a distributed Bragg reflector layer on a printed circuit board, which guides and converts light without the need for an additional quantum dot sheet, enhancing color reproducibility and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a lens is provided to cover a light source to widen an optical diffusion area, then the optical diffusion area is improved, but the number of local dimming blocks is reduced
Solution Approach 1:
The light guide body is divided into multiple light guide portions, each corresponding to a specific local dimming block. This segmentation allows the optical diffusion area to be expanded while maintaining the ability to independently control light emission in different regions, thus preserving the number of local dimming blocks despite the increased diffusion area.
2Illumination intensity
If a quantum dot sheet is provided at the rear of the display panel to improve color reproducibility, then color reproducibility is improved, but the thickness of the display apparatus is increased
Solution Approach 1:
The quantum dot layer is integrated directly onto the light guide body, merging the light conversion function with the light guiding structure. This eliminates the need for a separate quantum dot sheet at the rear of the display panel, thereby improving color reproducibility while avoiding the increase in overall thickness that would result from adding a separate layer.
Solution Approach 2:
Instead of placing the quantum dot sheet in the thickness dimension (at the rear of the panel), the quantum dot layer is positioned in the planar dimension on the light guide body surface. This dimensional repositioning allows color conversion functionality to be achieved without increasing the overall thickness of the display apparatus.
3Illumination intensity
If a quantum dot sheet is used to improve color reproducibility, then color quality is improved, but production cost is increased
Solution Approach 1:
The quantum dot layer is combined with the light guide body in a single integrated structure, eliminating the need for a separate quantum dot sheet and its associated mounting, alignment, and encapsulation processes. This integration simplifies the manufacturing process and reduces production costs while maintaining the color reproducibility improvements provided by the quantum dot material.
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 design increases the number of local dimming blocks, improves contrast ratio, maintains color reproducibility, reduces the amount of quantum dot material needed, and extends the lifespan of the light conversion member by dissipating heat and protecting it from direct light.
Implementation Method 1
The light conversion member may include a quantum dot particle provided to convert a wavelength of light emitted from the light source module
Implementation Method 2
a distributed Bragg reflector (DBR) layer disposed on the other surface of the light guide body and provided to improve a light conversion efficiency of the light conversion member
Implementation Method 3
a light guide body (e.g., a light guide) provided to guide the light emitted from the LED chip
Data Source
AI summary
An example display apparatus includes a liquid crystal panel; a light source plate including a printed circuit board disposed behind the liquid crystal panel, and a light source module mounted on the printed circuit board to supply light to the liquid crystal panel. The light source module includes a light emitting diode (LED) chip; a light guide provided to guide the light emitted from the LED chip; a light converter provided to convert a wavelength of light guided through the light guide, and disposed on a first surface of the light guide and attached to the printed circuit board; and a distributed Bragg reflector (DBR) layer disposed on a second surface of the light guide body and provided to improve a light conversion efficiency of the light conversion member.