Quantum Dot Film for OLED Color Gamut and Energy Efficiency
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Solution Overview
Problem
Current OLED displays using a white organic light emitting diode (WOLED) and color filter structure suffer from limited color gamut, low energy utilization, and high power consumption due to the wider spectrum of red and green light, which results in lower color purity and increased energy loss.
Innovation Solution
Incorporating a quantum dot photoluminescence film with red and green quantum dots excited by white light from the WOLED layer, followed by a color filter film to enhance color saturation and energy utilization, specifically arranging red and green quantum dots corresponding to their respective sub-pixels to emit high-purity red and green light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white organic light emitting diode (WOLED) with a two-layer or three-layer laminated structure is used to realize white light, then the white light spectrum is wider, but the color purity of red light and green light is lower and the color gamut is not wide enough
Solution Approach 1:
The patent introduces a quantum dot photoluminescence film as an intermediary component between the WOLED and the color filter. This film converts the broad-spectrum white light from the WOLED into narrow-band red and green light through quantum dot photoluminescence, thereby improving color purity while maintaining the simplicity of the WOLED structure
Solution Approach 2:
The patent utilizes the size-dependent optical properties of quantum dots by adjusting particle size to control emission wavelengths. This parameter change approach enables precise control over the spectral characteristics of red and green light, achieving high color purity without changing the fundamental WOLED structure
2Ease of operation
If a color filter is used to separate white light into red light and green light, then red light and green light can be obtained, but the energy loss of blue light is large and the energy utilization rate is low
Solution Approach 1:
The patent converts the previously wasted blue light energy into a useful resource by using quantum dots to absorb blue light and convert it into red and green light through photoluminescence. This transforms the energy loss into a beneficial effect, improving overall energy utilization
Solution Approach 2:
The quantum dot photoluminescence film serves as an intermediary that captures blue light energy and transforms it into red and green light, mediating the energy conversion process to eliminate direct energy loss while maintaining color separation functionality
3Manufacturing precision
If a quantum dot photoluminescence film is introduced to improve color purity, then color saturation increases, but the device structure becomes more complex
Solution Approach 1:
The quantum dot photoluminescence film performs multiple functions simultaneously: it improves color purity, converts blue light energy to red and green light, and maintains compatibility with existing WOLED and color filter structures. This multi-functionality reduces the need for additional separate components
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 configuration increases color saturation, broadens the color gamut, and reduces power consumption by fully utilizing short-wavelength light, resulting in improved energy efficiency and lower operating current density.
Implementation Method 1
a quantum dot photoluminescence film disposed on one side of the thin film transistor substrate away from the white organic light emitting diode layer
Data Source
AI summary
Provided is an organic light emitting diode display. The OLED display includes a thin film transistor substrate, a white OLED layer, a quantum dot photoluminescence film and a color filter film. The OLED display includes sub-pixels, which are sequentially disposed. The sub-pixels include a red sub-pixel, a green sub-pixel and a blue sub-pixel. A region of the quantum dot photoluminescence film corresponding to the red sub-pixel is provided with red quantum dots, and a region corresponding to the green sub-pixel is provided with green quantum dots. The red quantum dots and the green quantum dots are excited by white light emitted by the WOLED layer to emit high-purity red light and green light, respectively, and then filtered by the color filter film to be emitted. Thus, the OLED display has higher color saturation, which effectively broadens color gamut and can fully utilize the short-wavelength light.