OLED Display Device Resonance Auxiliary Layers
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Solution Overview
Problem
Current OLED display devices face challenges in achieving optimal light emission efficiency and display quality due to issues like shadow phenomena and color abnormalities, particularly at the blue pixel area, which affect the driving voltage and light emission efficiency of blue light.
Innovation Solution
The OLED display device incorporates a substrate with specific pixel areas for red, green, and blue light emission, featuring a multilayer structure including a hole transport layer, charge generation layers, resonance auxiliary layers, and buffer layers, with tailored distances and materials to optimize light resonance and emission, and includes a p-type doped charge generation layer to prevent exciton dissipation and leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform distance between first and second electrodes is used across all pixel areas, then the device structure is simple, but light emission efficiency and display quality deteriorate due to shadow phenomena and color abnormalities
Solution Approach 1:
The patent applies local quality by setting different electrode distances for different pixel areas. Specifically, the distance between the first and second electrodes in the blue pixel area is greater than in the red and green pixel areas. This localized differentiation resolves the shadow phenomena and color abnormalities specific to the blue pixel area while maintaining optimal performance for red and green areas.
2Reliability
If the electrode distance at blue pixel area is increased, then light emission efficiency improves, but device structure becomes more complex
Solution Approach 1:
The patent implements local quality by selectively increasing the electrode distance only in the blue pixel area where shadow phenomena occur, while maintaining the original distance in red and green pixel areas. This targeted approach improves blue light emission efficiency without unnecessarily complicating the entire device structure.
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 enhances light emission efficiency and display quality by adjusting resonance distances and preventing color abnormalities, thereby improving the overall performance of the OLED display device.
Implementation Method 1
a first charge generation layer and a first resonance auxiliary layer between the hole transport layer and the blue light emitting layer, a second resonance auxiliary layer between the hole transport layer and the red light emitting layer
Implementation Method 2
a first charge generation layer and a first resonance auxiliary layer between the hole transport layer and the blue light emitting layer
Data Source
AI summary
An OLED display device includes a substrate including red, green, and blue pixel areas, a first electrode at each of the red pixel area, the green pixel area, and the blue pixel area on the substrate, a hole transport layer on the first electrode, a light emission portion on the hole transport layer, the light emission portion including a red light emitting layer at the red pixel area, a green light emitting layer at the green pixel area, and a blue light emitting layer at the blue pixel area, a first charge generation layer and a first resonance auxiliary layer between the hole transport layer and the blue light emitting layer, a second resonance auxiliary layer between the hole transport layer and the red light emitting layer, an electron transport layer on the light emission portion, and a second electrode on the electron transport layer.