Wavelength Conversion Member With Convex-Concave Geometry
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Solution Overview
Problem
Conventional backlight units in LCDs face challenges in achieving brightness uniformity and high color reproduction, particularly with the direct-illumination type backlight units requiring increased thickness to ensure brightness uniformity, and existing quantum dot solutions do not fully optimize light conversion efficiency.
Innovation Solution
A display device incorporating a light guide plate with a wavelength conversion member featuring a convex part facing the light source and a concave part facing the light guide plate, which includes a host with wavelength conversion particles, allowing for improved light incidence and conversion, thereby enhancing color reproduction.
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 increased, but the thickness must be increased to ensure brightness uniformity
Solution Approach 1:
The receiving part of the wavelength conversion member is designed with a convex shape facing the light source, and the host is positioned in a concave region. This curved geometry focuses the divergent light from the LED onto the host, improving light incidence efficiency without requiring increased backlight unit thickness, thus resolving the contradiction between achieving high brightness and maintaining thin profile.
2Illumination intensity
If quantum dot bar is used to convert blue light into red and green light for high color reproduction, then color reproduction is improved, but light conversion efficiency is not fully optimized
Solution Approach 1:
The wavelength conversion member features a non-uniform structure with a convex receiving part and a concave host region. This local variation in geometry creates optimal light incidence angles at different positions, ensuring that blue light from the LED is efficiently converted to red and green light by the quantum dots, thereby improving both color reproduction and light conversion efficiency.
Solution Approach 2:
The invention changes the geometric parameters of the wavelength conversion member, specifically introducing convex and concave features. This parameter modification optimizes the path and angle of light incident on the quantum dots, enhancing the conversion efficiency from blue light to red and green light while maintaining high color reproduction quality.
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 convex and concave design ensures that light is incident substantially perpendicular to the host, effectively converting wavelengths and improving color reproduction in the display device, addressing the limitations of existing backlight units.
Implementation Method 1
a quantum dot bar having a plurality of quantum dots, which can convert blue light into red light or green light, is positioned in front of a blue LED that emits the blue light. Thus, as the blue light is irradiated onto the quantum dot bar, the blue light, the red light and the green light are mixed and the mixed light is incident into the light guide plate, thereby generating white light.
Implementation Method 2
The optical member and the display device according to the embodiment include the convex part and the concave part. Thus, the light emitted from the light source can be incident substantially perpendicular to the host.
Data Source
AI summary
Disclosed are an optical member and a display device. The display device includes a light guide plate; a light source on a lateral side of the light guide plate; and a wavelength conversion member between the light source and the light guide plate. The wavelength conversion member includes a receiving part between the light source and the light guide plate; a host in the receiving part; and a plurality of wavelength conversion particles in the host. The receiving part includes a convex part between the light source and the host; and a concave part between the light guide plate and the host.