Quantum Dot Backlight for LCD Light Utilization
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Solution Overview
Problem
Liquid crystal displays suffer from significant light loss due to color filters, requiring high-brightness backlights that increase power consumption and production costs.
Innovation Solution
A display device incorporating a liquid crystal panel with a blue light source and quantum dot phosphors in a light emitting layer, eliminating the need for color filters by emitting light of different wavelengths, thereby improving light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used in liquid crystal display to display color images, then color display capability is improved, but light loss increases to 66.6% of incident white light
Solution Approach 1:
The patent extracts and removes the color filters from the liquid crystal display structure, replacing them with a quantum dot phosphor layer that directly converts blue light to full-spectrum visible light, thereby eliminating the 66.6% light loss caused by traditional color filters while maintaining color display capability
Solution Approach 2:
The patent changes the optical parameters by using quantum dot phosphors with specific size distributions (2-50 nm) that exhibit size-dependent emission wavelengths, transforming the backlight emission spectrum from narrow-band blue to broad-spectrum visible light, thereby improving both color display and light utilization efficiency
2Illumination intensity
If high brightness backlight device is used to compensate for light loss, then display brightness is improved, but power consumption increases
Solution Approach 1:
The patent converts the harmful light loss through color filters into a beneficial process by using quantum dot phosphors that absorb the previously wasted blue light and convert it to useful full-spectrum visible light, thereby improving display brightness while reducing the power consumption of the backlight device
Solution Approach 2:
The patent changes the emission spectrum parameter of the backlight by using quantum dot phosphors with controlled size distribution, enabling the backlight to emit broad-spectrum visible light directly, which improves display brightness without requiring increased power consumption
3Illumination intensity
If traditional color filters are used, then color display is achieved, but light utilization efficiency decreases
Solution Approach 1:
The patent extracts and removes the traditional color filter layer from the display structure, replacing it with a quantum dot phosphor layer that converts blue light to full-spectrum visible light, thereby achieving color display without the 66.6% light loss inherent in color filter-based systems
Solution Approach 2:
The patent uses composite quantum dot phosphor materials with different size distributions (2-50 nm) that exhibit complementary emission spectra, creating a material system that converts blue light to broad-spectrum visible light with high efficiency, thereby improving both color display and light utilization efficiency
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 enhances light utilization efficiency and reduces power consumption by using quantum dot phosphors as a backlight, achieving higher brightness without damaging the liquid crystal layer.
Implementation Method 1
a light emitting layer disposed on the liquid crystal panel and excited by the blue light exiting through the liquid crystal panel to emit a light having a longer wavelength than the blue light... The first, second, and third color light emitting layers include quantum dot phosphors having different sizes from each other
Data Source
AI summary
In a display device, first and second substrates parallel to each other are arranged between first and second polarizers that are parallel to each other. A liquid crystal layer is arranged between the first and second substrates, and a light emitting layer having a quantum dot structure is arranged on the first polarizer. Also, a light source that emits a blue light is arranged under the second polarizer. Thus, the display device may improve a light utilizing efficiency, thereby improving a display quality.