LED Backlight Module with Quantum Dot Film for HDR Brightness
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Solution Overview
Problem
Conventional liquid crystal display (LCD) backlight modules fail to support wide color gamut and high dynamic range imaging (HDR) requirements, resulting in imperfect color representation and brightness, especially at high resolutions like 8K.
Innovation Solution
A light emitting diode (LED) backlight module incorporating a quantum dot enhancement film, a diffuser plate, and a blue light reflector/filter to optimize blue light utilization, enhancing the emission of red and green lights and improving brightness and color gamut performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional liquid crystal display backlight modules are used, then the display can achieve basic brightness and color requirements, but the color gamut and brightness performance are insufficient to support wide color gamut and high dynamic range imaging (HDR)
Solution Approach 1:
The patent combines the blue light reflector and blue light filter into a single integrated component that performs both functions. The blue light reflector reflects blue light from the LED toward the quantum dot enhancement film, while the blue light filter blocks excess blue light that would otherwise reduce color gamut performance. This merging of functions into one component achieves HDR brightness requirements while avoiding the complexity of separate reflector and filter assemblies.
Solution Approach 2:
The patent employs a quantum dot enhancement film that converts blue light to red and green light wavelengths, creating a composite optical system that generates wide color gamut. The quantum dots are embedded in a resin matrix, forming a composite material that transforms the spectral output of the blue LED into a full-spectrum white light with enhanced color properties, thereby achieving both high brightness and wide color gamut simultaneously.
2Measurement precision
If the resolution of liquid crystal displays is increased to 8K, then higher resolution images are achieved, but the color and brightness performance becomes insufficient to accurately present high resolution images
Solution Approach 1:
The patent changes the spectral parameters of the backlight by using quantum dots with specific size distributions that emit at precise red and green wavelengths. By controlling the quantum dot size and composition, the system optimizes the spectral power distribution to match the human visual system's color perception, thereby enhancing both brightness and color accuracy for high-resolution displays.
Solution Approach 2:
The patent applies local quality optimization by using a blue light reflector with specific reflectivity characteristics at different angles and positions. The reflector is designed to redirect blue light efficiently toward the quantum dot enhancement film while the filter selectively blocks blue light in specific spectral regions. This localized optimization of optical properties ensures that the backlight delivers enhanced brightness and color performance specifically where needed for accurate high-resolution image presentation.
3Illumination intensity
If blue light is increased to improve brightness, then brightness performance improves, but color gamut performance deteriorates due to excessive blue light
Solution Approach 1:
The patent implements an optical feedback mechanism where the blue light reflector redirects blue light that would otherwise be wasted back toward the quantum dot enhancement film. This creates a feedback loop that maximizes the utilization of blue light for generating red and green wavelengths through quantum dot conversion, thereby improving brightness while maintaining color gamut balance through the simultaneous action of the filter.
Solution Approach 2:
The quantum dot enhancement film acts as an intermediary that transforms blue light into red and green light wavelengths. By positioning the quantum dot film between the blue LED and the display panel, the system uses this intermediary material to convert excess blue light energy into the complementary red and green wavelengths needed for wide color gamut, thereby resolving the contradiction between brightness and color gamut 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 significantly improves the luminous efficiency, brightness, and color gamut performance of the LED backlight module, achieving up to 7-10% increase in brightness and meeting HDR brightness requirements of 2000 nits, providing more accurate and immersive high-resolution image presentation.
Implementation Method 1
The quantum dot enhancement film is excited by the blue lights emitted by the blue light emitting diodes so as to emit red lights and green lights
Implementation Method 2
The blue light reflector is disposed at a side, opposite to the quantum dot enhancement film, of the diffuser plate to reflect a part of the blue lights reflected by the diffuser plate to the quantum dot enhancement film
Implementation Method 3
The blue light filter and reflector is disposed between the diffuser plate and the quantum dot enhancement film to guide the blue lights emitted by the blue light emitting diodes to the quantum dot enhancement film and reflect a part of blue lights reflected by the quantum dot enhancement film to the quantum dot enhancement film again
Implementation Method 4
The light emitting diode light source has a plurality of blue light emitting diodes
Data Source
AI summary
A light emitting diode (LED) backlight module includes an LED light source, a quantum dot enhancement film, a diffuser plate, a blue light reflector, and a blue light filter and reflector. The LED light source includes a plurality of blue LEDs formed therein, the quantum dot enhancement film is excited by blue lights emitted by the blue LEDs to emit red lights and green lights, and the diffuser plate is disposed between the LED light source and the quantum dot enhancement film, and the blue light reflector is disposed on one side, opposite to the quantum dot enhancement film, of the diffuser plate to reflect a part of the blue lights reflected by the diffuser plate to the quantum dot enhancement film. In addition, the blue light filter and reflector is disposed between the diffuser plate and the quantum dot enhancement film.