Quantum Dot Filter Layer for WOLED Light Utilization
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Solution Overview
Problem
Existing WOLED display devices have a low light utilization rate and a narrow color gamut due to the inefficiencies in the color filter technology used in conjunction with WOLEDs.
Innovation Solution
A display substrate with a filter layer comprising red and green quantum dot materials that emit light when excited by blue light, combined with a blue-light transmission unit that allows direct transmission of blue light, replacing traditional color filters and enhancing light utilization and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional color filters are used in WOLED display devices, then the device structure is simple, but the light utilization rate is low and color gamut is narrow
Solution Approach 1:
The patent changes the optical parameters of the filter layer by replacing traditional color filters with quantum dot materials that have different emission characteristics. The quantum dots convert blue light to red and green light with high efficiency, fundamentally changing how the display layer handles light conversion and transmission.
Solution Approach 2:
The patent uses composite material structures including quantum dot materials combined with specific resin matrices, and multi-layer filter configurations (red filter layer with green light transmission, green filter layer with red light transmission, blue light transmission layer). These composite structures achieve both high light utilization and narrow color gamut expansion.
2Ease of manufacture
If traditional color filters are used in WOLED display devices, then the device structure is simple, but the color gamut is narrow
Solution Approach 1:
The patent changes the spectral emission parameters by using quantum dots with specific size-controlled emission wavelengths. The red quantum dots emit at 610-650nm and green quantum dots emit at 520-540nm, expanding the color gamut beyond traditional filter capabilities while maintaining structural simplicity.
Solution Approach 2:
The patent applies different filter characteristics to different regions of the display: the red filter layer allows green and blue transmission, the green filter layer allows red and blue transmission, and the blue layer transmits blue light directly. This localized optimization of optical properties expands overall color gamut.
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 significantly improves the light utilization rate and color gamut of the display device, reducing power consumption while maintaining better color purity.
Implementation Method 1
The red-light emission unit includes a red quantum dot material capable of emitting red light when it is irradiated by blue light
Implementation Method 2
the green-light emission unit includes a green quantum dot material capable of emitting green light when it is irradiated by the blue light
Implementation Method 3
a blue backlight module arranged at a side of a further substrate away from a display substrate and configured to emit blue light toward a filter layer
Data Source
AI summary
The present disclosure provides a display substrate, a display panel and a display device. The display substrate includes a first base substrate and a filter layer arranged on the first base substrate. The filter layer includes a red-light emission unit, a green-light emission unit and a blue-light transmission unit. The red-light emission unit includes a red quantum dot material capable of emitting red light when it is irradiated by blue light, the green-light emission unit includes a green quantum dot material capable of emitting green light when it is irradiated by the blue light, and the blue-light transmission unit is not covered with a quantum dot material and the blue light is transmitted through the blue-light transmission unit.