OLED Insulating Barriers Block Carrier Diffusion
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Solution Overview
Problem
In AMOLED displays, electron diffusion between adjacent subpixels causes light emission crosstalk and abnormal color shifts due to weak electric fields during low grayscale displays, leading to color coordinate shifts.
Innovation Solution
An insulating barrier is provided between adjacent OLED subpixels with different colors to block carrier diffusion, preventing electron and hole migration into adjacent subpixels and thus reducing light-emitting crosstalk and color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrons are allowed to diffuse freely in the electron transport layer, then the device structure remains simple, but carrier diffusion between adjacent subpixels causes light emission crosstalk and color coordinate shifts
Solution Approach 1:
The patent divides the electron transport layer into separate regions for each subpixel by introducing insulating barriers. These barriers segment the continuous electron transport layer into isolated segments, preventing electron diffusion between adjacent subpixels while maintaining the electron transport function within each subpixel region.
Solution Approach 2:
The patent introduces an insulating barrier as an intermediary element between adjacent subpixels. This barrier acts as a mediator that blocks electron diffusion from one subpixel to another, resolving the crosstalk issue without affecting the normal electron transport within each subpixel.
2Manufacturing precision
If insulating barriers are added between adjacent subpixels to block carrier diffusion, then color coordinate accuracy improves, but device structure and manufacturing complexity increase
Solution Approach 1:
The patent uses thin film insulating barriers to prevent carrier diffusion between subpixels. These thin film structures provide effective electrical isolation while occupying minimal space and adding minimal structural complexity to the device.
Solution Approach 2:
The patent employs porous insulating barrier materials that allow for effective carrier blocking while maintaining structural integrity. The porous structure provides sufficient electrical isolation with reduced material usage and minimized impact on device architecture.
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 barriers effectively prevent carrier diffusion, maintaining accurate color coordinates and reducing emission crosstalk between adjacent subpixels, thereby enhancing display performance by preventing color shifts.
Implementation Method 1
the barrier is configured to block a carrier diffusion between the two adjacent OLED subpixels
Implementation Method 2
Electron migration is under the effect of electric field, from the electron transport layer 13 to the organic light-emitting layers 141 to 143
Implementation Method 3
the luminescent molecules emit visible light after radiation relaxation
Implementation Method 4
the electrons and holes migrate to the organic light-emitting layers 141 to 143 through the electron transport layer 13 and the hole transport layer 15, respectively, and meet in the organic light-emitting layers 141 to 143 to form excitons
Data Source
AI summary
An OLED device is provided, including a substrate and a plurality of OLED subpixels arranged on the substrate. An insulating barrier is provided between every two adjacent OLED subpixels with different colors, and the barrier is configured to block a carrier diffusion between the two adjacent OLED subpixels. The disclosure further provides a display apparatus including the OLED device, which can prevent the light emission crosstalk between the adjacent OLED subpixels and avoid the color coordinate shift of the OLED subpixels.