Display Substrate Cleaning With Electric-Field Element Fixing
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Solution Overview
Problem
Current display device manufacturing methods fail to effectively remove foreign substances from substrates during the cleaning process, which can lead to misalignment and damage of light emitting elements.
Innovation Solution
A method and apparatus that involves applying a first electric field to fix light emitting elements on a substrate, using a cleaning device with gas spraying and suction to remove foreign substances, and then releasing the electric field to align the elements using a second electric field, while also controlling the inkjet head to ensure proper coverage based on reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cleaning process is performed to remove foreign substances from the substrate, then cleaning effectiveness is improved, but light emitting elements may be damaged or misaligned
Solution Approach 1:
The patent applies a first electric field to the substrate before the cleaning process to fix the light emitting elements in their discharged positions. This preliminary action prevents the elements from moving or being damaged during subsequent cleaning operations, allowing effective removal of foreign substances without compromising the integrity of the light emitting elements.
2Stability of the object's composition
If the electric field is maintained during cleaning to protect light emitting elements, then element stability is improved, but foreign substance removal efficiency deteriorates
Solution Approach 1:
The patent divides the electric field application into two distinct segments: a first electric field applied during cleaning to stabilize light emitting elements, and a second electric field applied after cleaning to align the elements. This segmentation allows the cleaning process to proceed efficiently with the first electric field providing necessary stability, while the alignment function is handled separately by the second electric field, thus resolving the contradiction between stability and removal efficiency.
3Quantity of substance
If ink is discharged onto the substrate to deposit light emitting elements, then element coverage is improved, but foreign substance contamination increases
Solution Approach 1:
The patent converts the harmful effect of foreign substance contamination into a beneficial cleaning opportunity. By discharging ink containing light emitting elements onto the substrate and then performing a controlled cleaning process with electric field application, the method removes foreign substances while preserving the deposited light emitting elements. The cleaning process, which would normally remove all particles, is modified by the electric field to selectively retain the light emitting elements while removing contaminants.
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 ensures the effective removal of foreign substances without damaging the substrate or misaligning the light emitting elements, allowing for precise alignment and efficient manufacturing of display devices.
Implementation Method 1
an inkjet head discharging ink including light emitting elements onto the substrate
Implementation Method 2
an electric field applying device applying a first electric field to the substrate to fix the light emitting elements
Implementation Method 3
a cleaning device removing foreign substances from the substrate in a state in which the first electric field is applied to the substrate
Data Source
AI summary
A method of manufacturing a display device includes discharging ink including light emitting elements onto a substrate; applying a first electric field to the substrate to fix the light emitting elements; removing foreign substances from the substrate by using a cleaning device in a state in which the first electric field is applied to the substrate; and releasing application of the first electric field after the removing of the foreign substances from the substrate by using the cleaning device.