Display Pixel Charge Generation Layout to Prevent Leaky Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices experience leaky emission between neighboring pixels of different colors, leading to image quality degradation.
Innovation Solution
The display device is designed with a specific pixel configuration where each pixel includes a first electrode, a first sub-light emitting portion, a charge generation layer, a second sub-light emitting portion, and a second electrode, with the hole transport layer of one pixel overlapping and contacting the charge generation layer of an adjacent pixel, and the charge generation layers of adjacent pixels being separated, ensuring alignment and separation of charge generation layers to prevent current flow between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If charge generation layers of adjacent pixels are continuously formed to simplify manufacturing, then manufacturing precision is improved, but image quality deteriorates due to leaky emission between neighboring pixels
Solution Approach 1:
The charge generation layer is segmented into discrete regions corresponding to each pixel, with intentional gaps between adjacent pixels. This segmentation prevents electrical connection between neighboring pixels while maintaining manufacturing simplicity through a standardized layer formation process.
Solution Approach 2:
The harmful electrical connection between adjacent pixel charge generation layers is extracted and removed by creating separation regions. This allows the charge generation layer to be continuously formed over the substrate while selectively removing or isolating the portions that would cause leaky emission between pixels.
2Reliability
If hole transport layer completely covers charge generation layer to ensure proper charge transport, then reliability is improved, but device complexity increases due to overlapping structures between adjacent pixels
Solution Approach 1:
The hole transport layer is extended to overlap adjacent pixels, merging the charge transport function across pixel boundaries. This overlapping structure simplifies the overall device configuration by using a continuous layer rather than discrete segmented layers, while the charge generation layer separation prevents actual electrical merging.
3Productivity
If pixels are arranged with adjacent charge generation layers to maximize display area, then productivity is improved, but image quality deteriorates due to color mixing from leaky emission
Solution Approach 1:
The charge generation layers of adjacent pixels are segmented with separation regions between them, preventing electrical connection while allowing tight pixel spacing. This enables maximum display area utilization without color mixing from leaky emission between neighboring pixels of different colors.
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 effectively prevents leaky emission between neighboring pixels, enhancing image quality by maintaining color accuracy and reducing unintended light emission.
Implementation Method 1
a hole transport layer disposed on the first charge generation layer
Implementation Method 2
An electron injected from one electrode and a hole injected from another electrode may be combined in an organic emission layer to form an exciton. As the exciton changes from an exited state to a ground state, it can emit energy and emit light.
Data Source
AI summary
A display device includes a first pixel, a second pixel, and a third pixel each of which includes a first electrode on a substrate, a first sub-light emitting portion on the first electrode, a first charge generation layer on the first sub-light emitting portion, a second sub-light emitting portion on the first charge generation layer, and a second electrode on the second sub-light emitting portion. The second sub-light emitting portion includes a hole transport layer on the first charge generation layer and an emission layer on the hole transport layer. The hole transport layer of the first pixel is on the first charge generation layer of the first pixel and completely covers the first charge generation layer of the first pixel. A part of an edge of the hole transport layer of the first pixel overlaps the first charge generation layer of the second pixel.