Light Conversion Member for Uniform Color Reproduction in LED Displays
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Solution Overview
Problem
Current LED-based display devices face challenges in achieving high image quality with uniform color reproduction due to light loss and color uniformity issues in backlight units.
Innovation Solution
A light conversion member is introduced, comprising light conversion particles and a sealing member with specific reflection parts, which converts the wavelength of light emitted from a light source, allowing for uniform mixing of blue, green, and red lights to produce white light with consistent divergence angles, thereby enhancing color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used to emit red and green light from a blue LED, then high brightness and superior color reproduction are achieved, but light loss and color uniformity issues occur in backlight units
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the blue LED and the display panel. The light guide plate receives blue light from the LED, guides it through its internal structure, and extracts light at multiple positions along its length. This intermediary structure enables uniform light distribution and color consistency across the backlight while maintaining high brightness, resolving the contradiction between brightness and light loss/uniformity
Solution Approach 2:
The invention transitions from a simple linear light path to a three-dimensional light guiding structure. The light guide plate uses its thickness and lateral dimensions to control light propagation, with light entering at one end and being extracted through its sides at multiple positions. This dimensional approach allows uniform color reproduction across the entire backlight area while minimizing light loss
2Illumination intensity
If quantum dots are used to emit red and green light from a blue LED, then superior color reproduction is achieved, but color uniformity issues occur in backlight units
Solution Approach 1:
The light guide plate serves as a mediator that uniformizes the light distribution from the blue LED. By extracting light at multiple predetermined positions along its length, it ensures consistent color characteristics across different regions of the backlight, achieving superior and uniform color reproduction throughout the display area
Solution Approach 2:
The light guide plate is designed with different extraction characteristics at different positions. Light is extracted at multiple predetermined positions along the length of the plate, with each position optimized to contribute to uniform overall color distribution. This local variation in light extraction ensures that each region of the backlight maintains consistent color 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 solution enables uniform color reproduction and improved image quality by ensuring that blue, green, and red lights are emitted at the same divergence angle, effectively addressing light loss and color uniformity issues in LED-based display devices.
Implementation Method 1
a light conversion member adjacent to the light source... a plurality of light conversion particles to convert a wavelength of a light emitted from the light source
Implementation Method 2
a sealing member to receive the light conversion particles... a reflection part connected to the incident part and the exit part... guide emitted light through the reflection part
Data Source
AI summary
Disclosed are a light conversion member and a display device having the same. The display device includes a light source, and a light conversion member adjacent to the light source. The light conversion member includes a plurality of light conversion particles to convert a wavelength of a light emitted from the light source, and a sealing member to receive the light conversion particles. The sealing member includes an incident part facing an exit surface of the light source, an exit part facing the incident part while the light conversion particles are interposed between the exit part and the incident part, and a reflection part connected to the incident part and the exit part.