Emission Area Electrode Layout for Dark-Spot-Free Display Alignment
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Solution Overview
Problem
Current display devices face challenges in improving luminance and preventing dark spots in emission areas, particularly due to the inefficient arrangement and alignment of light emitting elements.
Innovation Solution
The display device incorporates a bank on a substrate with distinct emission areas, where alignment electrodes provide alternating AC and ground signals to light emitting elements, ensuring proper alignment and preventing overlap, thereby enhancing luminance and preventing dark spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light emitting elements are arranged in emission areas without proper alignment control, then the emission area can be fully utilized, but dark spots occur due to abnormal placement
Solution Approach 1:
Alignment electrodes are introduced as intermediary components between the emission areas and light emitting elements. These electrodes generate electric fields that act as mediators to guide and align light emitting elements during the inkjet printing process, ensuring precise positioning without compromising emission area utilization
Solution Approach 2:
Alignment electrodes are pre-configured in the emission areas before light emitting elements are deposited. The electrodes establish predetermined electric field patterns that guide the alignment of light emitting elements during the manufacturing process, preventing dark spots before they occur
2Illumination intensity
If alignment electrodes are placed close to emission areas to improve alignment precision, then luminance can be enhanced, but electrode complexity increases
Solution Approach 1:
The alignment electrodes serve multiple functions: they align light emitting elements during deposition, define emission area boundaries, and can potentially serve as electrical contacts. This multi-functionality reduces the need for separate alignment structures, thereby limiting the increase in device complexity
Solution Approach 2:
The alignment electrode structure is merged with the existing electrode patterns in the display device. By combining alignment functionality with existing electrode layers, the patent avoids adding separate complex alignment mechanisms, thus enhancing luminance while controlling device complexity
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 improves light emission efficiency and luminance by ensuring precise alignment of light emitting elements and preventing abnormal placement, thus minimizing dark spots in the emission areas.
Implementation Method 1
first alignment electrodes, at least a number of the first alignment electrodes being disposed in the first emission area; second alignment electrodes, at least a number of the second alignment electrodes being disposed in the second emission area... each of the first alignment electrodes may alternately provide an AC signal and a ground signal in case that the light emitting element is aligned
Data Source
AI summary
A display device includes a bank disposed on a substrate, the bank surrounding at least a portion of each of a first emission area and a second emission area in a plan view; first alignment electrodes, at least a number of the first alignment electrodes being disposed in the first emission area; second alignment electrodes, at least a number of the second alignment electrodes being disposed in the second emission area; and a light emitting element disposed in each of the first emission area and the second emission area. An electrode most adjacent to the second emission area among the first alignment electrodes and an electrode most adjacent to the first emission area among the second alignment electrodes are spaced apart from each other with a dividing line disposed therebetween, and the dividing line overlaps the bank in a plan view.