US12274154B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12274154-B2 |
| Application number | US-202418605154-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 14, 2024 |
| Priority date | Jun 17, 2019 |
| Publication date | Apr 8, 2025 |
| Grant date | Apr 8, 2025 |
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An ink droplet volume measuring apparatus including: a substrate on which an ink droplet is dropped; a chromatic confocal sensor irradiating light having a plurality of wavelengths to the ink droplet dropped on the substrate and scanning the ink droplet; and a controller calculating a three-dimensional shape of the ink droplet from a signal scanned by the chromatic confocal sensor.
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What is claimed is: 1. A method of manufacturing a display apparatus, the method comprising: forming a plurality of emission devices on a first substrate; forming a plurality of quantum dot thin-film layers on a second substrate; and sealing the first substrate and the second substrate such that the plurality of emission devices and the plurality of quantum dot thin-film layers correspond to each other, wherein the forming of the quantum dot thin-film layers comprises: dropping ink droplet for forming the quantum dot thin-film layer on a test substrate by using a nozzle of an inkjet head, scanning and irradiating light having a plurality of wavelengths by a chromatic confocal sensor on the ink droplet dropped on the test substrate; obtaining a three-dimensional shape of the ink droplet from a signal scanned by the chromatic confocal sensor to feedback-control an ejection amount of the nozzle; and dropping the feedback-controlled ink droplet on the second substrate to be the quantum dot thin-film layer. 2. The method of claim 1 , wherein a plurality of the nozzles are provided to drop a plurality of ink droplets on the test substrate. 3. The method of claim 2 , wherein the chromatic confocal sensor scans the plurality of ink droplet to obtain a three-dimensional shape for each of the plurality of ink droplets and feedback-controls an ejection amount of each of the plurality of nozzles. 4. The method of claim 1 , wherein the ink droplet comprises nanoparticles. 5. The method of claim 1 , wherein the second substrate and the test substrate are respectively mounted on different stages.
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