Inkjet Display Intermediate Layer Drying With Peripheral Dummy Lines
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Solution Overview
Problem
Existing display device manufacturing methods face challenges in achieving uniform drying of intermediate layers, leading to potential spot generation issues across the display area.
Innovation Solution
A manufacturing method involving the use of dummy lines with specific solvents of varying vapor pressures, formed using a dispenser and inkjet printing, ensures uniform drying of intermediate layers by controlling the volatilization rates of solvents in the peripheral areas, thereby maintaining consistent thickness and preventing spot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used to form intermediate layers, then the manufacturing process is simple, but uniform drying cannot be achieved leading to spot generation
Solution Approach 1:
Dummy lines are formed in advance in the peripheral area surrounding the display area. These dummy lines contain solvents with higher vapor pressure that evaporate first during the drying process, creating a controlled vapor environment that prevents spot generation in the display area before the actual functional layers are dried.
Solution Approach 2:
The dummy lines act as intermediary elements that mediate the drying process. By containing solvents with different vapor pressures than the functional layers, they serve as a buffer zone that controls the overall drying environment, ensuring uniform evaporation across the display area without directly affecting the functional performance of the device.
2Manufacturing precision
If solvents with different vapor pressures are used in dummy lines, then uniform drying is achieved, but the number of materials and process steps increases
Solution Approach 1:
The invention changes the vapor pressure parameter of solvents by selecting different solvent types for dummy lines compared to functional layers. Dummy line solvents have higher vapor pressure (1-100 Torr range) while functional layer solvents have lower vapor pressure (10^-3 to 10^-6 Torr range), creating a staged evaporation process that ensures uniform drying without requiring complex process control.
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 approach allows for the production of display devices with controlled spot generation, ensuring uniformity and quality across the entire display area by synchronizing the drying rates of solvents in the dummy lines and functional layers.
Implementation Method 1
a vapor pressure of the first solvent may be higher than that of the second solvent
Implementation Method 2
A vapor pressure of the second solvent may be lower than that of the first solvent. The second solvent may have a range of 1 to 10−6 Torr at room temperature (25° C.) and atmospheric pressure.
Implementation Method 3
A volatilization rate of the first solvent may be greater than that of the second solvent
Data Source
AI summary
An embodiment of the present invention provides a manufacturing method of a display device, including: forming a pixel circuit portion overlapping a display area on a substrate; forming a first electrode that is electrically connected to the pixel circuit portion; forming a partition wall overlapping a portion of the first electrode; forming a dummy line overlapping a peripheral area surrounding the display area by using a dispenser; and forming at least a portion of an intermediate layer in the partition wall by an inkjet process.