OLED Panel Blue Light Red Shift Mitigation via White OLED and Color Filter
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Solution Overview
Problem
Existing OLED panels using Side-By-Side (SBS) technology suffer from red shift due to the short lifespan of blue organic light emitting materials, leading to reduced color saturation and a pinkish display over time.
Innovation Solution
Incorporating a color filter layer to filter out blue light from the light emitting units, specifically using a white OLED+blue CF structure where the blue light is generated by a white organic light emitting unit and a color filter, and optionally adding a second blue color filter layer on the green light emitting unit to maintain blue light quantity and adjust white light coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If blue organic light emitting materials are used in SBS technology, then blue light emission is achieved, but the lifespan is short causing red shift and color saturation loss
Solution Approach 1:
The invention separates the blue light generation function from the blue organic light emitting material. Instead of relying solely on the short-lived blue OLED material, the patent divides the system into: (1) the original blue light emitting unit, and (2) a new blue light generating path using a white light emitting unit combined with a blue color filter layer. This segmentation allows the system to bypass the lifespan limitation of blue organic materials while maintaining blue light output.
Solution Approach 2:
The blue color filter layer acts as an intermediary to generate blue light. Instead of directly relying on the unstable blue organic light emitting material, the patent introduces a color filter layer that converts white light into blue light. This intermediary mechanism provides a stable, long-lived blue light source that does not suffer from the degradation issues of organic blue materials.
2Reliability
If a color filter layer is added to filter blue light, then blue light quantity is maintained, but device structure becomes more complex
Solution Approach 1:
The white light emitting unit serves multiple functions: it provides white light for the white sub-pixel and simultaneously serves as a light source for the blue color filter layer to generate blue light. This multi-functionality reduces the need for separate blue light emitting units, thereby limiting the increase in device complexity while achieving reliable blue light output.
Solution Approach 2:
The patent utilizes color conversion through the blue color filter layer, which transforms white light into blue light. This approach allows the system to achieve stable blue light emission without requiring separate blue organic light emitting materials, thereby maintaining color saturation while avoiding the lifespan issues of traditional blue OLED materials.
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 solution effectively addresses the red shift issue by maintaining blue light color saturation and extending the lifespan of blue light emission, thereby improving the overall color accuracy and longevity of the OLED panel.
Implementation Method 1
a color filter layer, wherein the color filter layer is disposed on a light exit side of the white light emitting unit and filters out blue light from all white light emitted by the white light emitting unit
Implementation Method 2
a second blue color filter layer disposed on a light exit side of the green light emitting unit to filter out blue light from a part of green light emitted by the green light emitting unit
Implementation Method 3
each of the light emitting units includes an anode, a cathode and a light emitting layer between the anode and the cathode
Data Source
AI summary
The present disclosure relates to an organic light emitting diode panel and a method for manufacturing the same, and a display device. The organic light emitting diode panel includes a light emitting function layer disposed on a substrate, wherein the light emitting function layer includes a first light emitting unit, a second light emitting unit, and a third light emitting unit, the first light emitting unit, the second light emitting unit, and the third light emitting unit emit light of three colors, a light exit side of at least one of the light emitting units is provided with a color filter layer that filters out blue light from light emitted by the at least one of the light emitting units.