Apparatus and method for measuring thickness of ink layer in pixel
AssigneeSamsung Electronics Co., Ltd.
InventorsSang-il Kim, Tae-gyun Kim, Tae-woon Cha, Sang-kwon Wee
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Abstract
Provided are an apparatus and method for measuring the thickness of an ink layer in a pixel and a method of controlling nozzles of an inkjet head using the apparatus and method. The apparatus includes: a substrate; a plurality of pixels disposed on the substrate and filled with ink due to a printing operation; first and second electrodes corresponding to the pixels, the first and second electrodes disposed on opposite sides of each of the pixels; and a capacitance measurement circuit electrically connected to the first and second electrodes to measure the capacitance of each of the pixels.
Claims11
An apparatus for measuring a thickness of an ink layer, the apparatus comprising:
- a substrate;
- a plurality of pixels disposed on the substrate and filled with ink due to a printing operation;
- first and second electrodes corresponding to each of the pixels, the first and second electrodes disposed on opposite sides of each of the pixels;
- and
- a capacitance measurement circuit electrically connected to the first and second electrodes to measure the capacitance of each of the pixels.
A method of measuring a thickness of an ink layer using an apparatus comprising a substrate, a plurality of pixels disposed on the substrate and filled with ink due to a printing operation, first and second electrodes corresponding to each of the pixels, the first and second electrodes disposed on opposite sides of each of the pixels, and a capacitance measurement circuit electrically connected to the first and second electrodes to measure the capacitance of each of the pixels, the method comprising:
- measuring an initial capacitance of each of the pixels when the pixels are not filled with ink;
- filling the pixels with the ink due to the printing operation;
- measuring the capacitance of each of the pixels using the capacitance measurement circuit;
- and
- calculating the thickness of an ink layer filled in each of the pixels.
A method of controlling nozzles of an inkjet head using an apparatus comprising a substrate, a plurality of pixels disposed on the substrate and filled with ink due to a printing operation, first and second electrodes corresponding to each of the pixels, the first and second electrodes disposed on opposite sides of each of the pixels, and a capacitance measurement circuit electrically connected to the first and second electrodes to measure the capacitance of each of the pixels, wherein the printing operation is performed using an inkjet technique, and the pixels correspond respectively to nozzles of the inkjet head, the method comprising:
- measuring an initial capacitance of each of the pixels when the pixels are not filled with the ink;
- filing the pixels corresponding to the nozzles with the ink by applying voltages having preset waveforms to the respective nozzles of the inkjet head;
- measuring the capacitances of the pixels using the capacitance measurement circuit;
- calculating the thickness of an ink layer filled in each of the pixels;
- and
- setting waveforms of voltages corresponding to target thicknesses of ink layers to be formed in the nozzles of the inkjet head.
Dependencies are inferred from the claim text.