Apparatus and method for dispensing liquid crystal
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B65B-001/30
B65B-031/00
B67C-003/02
출원번호
US-0421714
(2003-04-24)
우선권정보
KR-0042725 (2002-07-20)
발명자
/ 주소
Ryu, Joung-Ho
Kweon, Hyug-Jin
Son, Hae-Joon
Bang, Kyu-Yong
Kim, Joon-Young
An, Man-Ho
Seo, Yong-Kyu
출원인 / 주소
LG Philips LCD Co., Ltd.
Top Engineering Co., Ltd.
대리인 / 주소
Morgan, Lewis &
인용정보
피인용 횟수 :
10인용 특허 :
41
초록▼
A liquid crystal dispensing apparatus dispenses liquid crystal onto a substrate. The liquid crystal dispensing apparatus includes a frame, a table, at least one liquid crystal discharge device, and a liquid crystal amount inspecting portion. The table is installed on the frame to have the substrate
A liquid crystal dispensing apparatus dispenses liquid crystal onto a substrate. The liquid crystal dispensing apparatus includes a frame, a table, at least one liquid crystal discharge device, and a liquid crystal amount inspecting portion. The table is installed on the frame to have the substrate to be mounted thereon. The liquid crystal discharge device adjustably discharges an amount of liquid crystal, and the liquid crystal amount inspecting portion inspects a liquid crystal dispensing amount by comparing an actual amount of liquid crystal discharged from the liquid crystal discharge device with a preset liquid crystal amount. The liquid crystal discharge device includes a piston to perform ascending motions to draw in the liquid crystal and descending motions to discharge the liquid crystal with an angle of at least a portion of the liquid crystal discharge device determining a magnitude of the ascending/descending motion to control an amount of liquid crystal discharged.
대표청구항▼
1. A liquid crystal dispensing apparatus for dispensing liquid crystal onto a substrate, comprising:a frame; a table installed on the frame to have the substrate to be mounted thereon; at least one liquid crystal discharge device to adjustably discharge an amount of liquid crystal, the liquid crysta
1. A liquid crystal dispensing apparatus for dispensing liquid crystal onto a substrate, comprising:a frame; a table installed on the frame to have the substrate to be mounted thereon; at least one liquid crystal discharge device to adjustably discharge an amount of liquid crystal, the liquid crystal discharge device including a piston to perform ascending motions to draw in the liquid crystal and descending motions to discharge the liquid crystal with an angle of at least a portion of the liquid crystal discharge device determining a magnitude of the ascending/descending motion to control an amount of liquid crystal discharged; and a liquid crystal amount inspecting portion to inspect a liquid crystal dispensing amount by comparing an actual amount of liquid crystal discharged from the liquid crystal discharge device with a preset liquid crystal amount. 2. The apparatus according to claim 1, wherein a plurality of absorption holes are defined on the table to fix the substrate on the table.3. The apparatus according to claim 1, wherein the table is movably installed on the frame to coordinate liquid crystal dispensing positions on the substrate with respect to discharging of the liquid crystal discharge device.4. The apparatus according to claim 1, wherein the liquid crystal discharge device further includes a rotatable body and an arm member, the arm member projected from the piston and mated with the rotatable body so that the arm member pulls/pushes the piston in accordance with a rotation of the rotatable body to effect the ascending/descending motion.5. The apparatus according to claim 4, wherein the piston performs a rotation motion together with the ascending/descending motion.6. The apparatus according to claim 4, wherein an end of the arm member is inserted into a hole in the rotatable body.7. The apparatus according to claim 1, wherein the liquid crystal discharge device further includes:a syringe unit to contain the liquid crystal; a cylinder having a liquid crystal suction hole for receiving the liquid crystal from the syringe unit and a liquid crystal discharge hole for discharging the liquid crystal; and a nozzle unit to dispense the liquid crystal discharged from the discharge hole of the cylinder onto the substrate, wherein the piston is inserted into the cylinder to perform rotation and ascending/descending motions such that the liquid crystal is drawn through the suction hole and discharged through the discharge hole. 8. The apparatus according to claim 7, wherein the liquid crystal discharge device includes:a first motor to provide a driving force to the piston; a second motor to provide a driving force for adjusting the angle of the cylinder; a rotational shaft connected to the second motor and having a screw thread thereon; and a capacity adjustment bracket to adjust a capacity of the cylinder by varying the angle of the cylinder according to the rotation of the rotational shaft, the capacity adjustment bracket having a first side coupled with the rotational shaft and a second side connected to the cylinder. 9. The apparatus according to claim 8, wherein the liquid crystal discharge device further includes a LVDT (linear variable differential transformer) to measure a displacement of the capacity adjustment bracket.10. The apparatus according to claim 7, wherein the liquid crystal discharge device includes:a pad installed on the syringe unit; an injector needle inserted into the syringe unit through the pad; and a connection pipe combined with the injector needle to guide the liquid crystal from the syringe unit via the injector needle to the nozzle unit. 11. The apparatus according to claim 10, wherein the pad includes at least one of a silicone and a butyl rubber group.12. The apparatus according to claim 10, wherein the liquid crystal discharge device further includes an air bubble sensor respectively formed at ends of the connection pipe to sense occurrences of air bubbles in the liquid crystal flowing through the connection pipe.13. The apparatus according to claim 7, wherein the liquid crystal discharge device further includes a protection cap to protect the nozzle unit.14. The apparatus according to claim 1, wherein the liquid crystal amount inspecting portion includes:a measuring cup to receive and contain the liquid crystal discharged from the liquid crystal discharge device; and an electronic scale to determine an amount of the liquid crystal contained in the measuring cup. 15. The apparatus according to claim 14, wherein the measuring cup is respectively installed at the both sides of the frame.16. A method of manufacturing a liquid crystal display device using the liquid crystal dispensing apparatus according to claim 1, comprising the steps of:dispensing liquid crystal from the liquid crystal dispensing apparatus onto a first substrate; and attaching a second substrate with the first substrate so that the dispensed liquid crystal is disposed between the first and second substrates. 17. A method of manufacturing a liquid crystal display device using the liquid crystal dispensing apparatus according to claim 4, comprising the steps of:dispensing liquid crystal from the liquid crystal dispensing apparatus onto a first substrate; and attaching a second substrate with the first substrate so that the dispensed liquid crystal is disposed between the first and second substrates. 18. A liquid crystal dispensing method, comprising the steps of:calculating a liquid crystal dispensing amount by comparing an actual amount of liquid crystal dispensed from a liquid crystal discharge device with a preset liquid crystal amount, the liquid crystal discharge device including a piston to perform ascending motions to draw in the liquid crystal and descending motions to discharge the liquid crystal with an angle of at least a portion of the liquid crystal discharge device determining a magnitude of the ascending/descending motion to control an amount of liquid crystal discharged; adjusting the liquid crystal dispensing amount to be substantially equal to the preset liquid crystal amount by adjusting the angle; moving a substrate mounted on a table relative to liquid crystal discharge device so that the liquid crystal discharge device is positioned relative to an initial dispensing position; descending the liquid crystal discharge device to a first set distance above the substrate; dispensing the liquid crystal dispensing amount onto the substrate; ascending the liquid crystal discharge device to a second set distance above the substrate; and removing the substrate from the table. 19. The method according to claim 18, wherein the calculating step includes the steps of:determining the preset liquid crystal amount; dispensing liquid crystal into a measuring cup; determining an amount of liquid crystal dispensed into the measuring cup; comparing the determined liquid crystal amount with the preset liquid crystal amount; and calculating a difference value when the determined liquid crystal amount is different from the preset liquid crystal amount. 20. The method according to claim 19, wherein the adjusting step includes the step of controlling a liquid crystal capacity of the liquid crystal discharge device using a motor according to the difference value.21. The method according to claim 18, wherein the liquid crystal discharge device further includes a rotatable body and an arm member, the arm member projected from the piston and mated with the rotatable body, wherein the dispensing step includes rotating the rotatable body so that the arm member pulls/pushes the piston in accordance with a rotation of the rotatable body to effect the ascending/descending motion.22. A liquid crystal dispensing method, comprising the steps of:calculating a liquid crystal dispensing amount by comparing an actual amount of liquid crystal dispensed from a liquid crystal discharge device with a preset liquid crystal amount, the liquid crystal discharge device having a piston to perform a pumping action; moving a substrate mounted on a table relative to liquid crystal discharge device so that the liquid crystal discharge device is positioned relative to an initial dispensing position; descending the liquid crystal discharge device to a first set distance above the substrate; dispensing the liquid crystal dispensing amount onto the substrate by performing a pumping with the piston; ascending the liquid crystal discharge device to a second set distance above the substrate; and unloading the substrate from the table. 23. The method according to claim 22, further comprising the step of adjusting the liquid crystal dispensing amount to be substantially equal to the preset liquid crystal amount by adjusting the angle of a portion of the liquid crystal discharge device.24. The method according to claim 22, wherein the pumping of the piston forms a four stage motor such that a suction hole is opened and a discharge hole is closed when the piston is disposed at a first position, the suction hole and the discharge hole are closed when the piston is disposed at a second position, the suction hole is closed and the discharge hole is opened when the piston is disposed at a third position, and the suction hole and the discharge hole are closed when the piston is disposed at a fourth position.25. The method according to claim 22, wherein the piston performs ascending motions to draw in the liquid crystal and descending motions to discharge the liquid crystal with an angle of at least a portion of the liquid crystal discharge device determining a magnitude of the ascending/descending motion to control an amount of liquid crystal discharged.26. The method according to claim 25, wherein the liquid crystal discharge device further includes a rotatable body and an arm member, the arm member projected from the piston and mated with the rotatable body, wherein the dispensing step includes rotating the rotatable body so that the arm member pulls/pushes the piston in accordance with a rotation of the rotatable body to effect an ascending/descending motion.27. A liquid crystal discharging device, comprising:a syringe to contain liquid crystal; a cylinder having a liquid crystal suction hole for drawing in the liquid crystal from the syringe and a liquid crystal discharge hole for discharging the liquid crystal; a piston inserted into the cylinder to perform rotation and ascending/descending motions and having a suction-discharge groove at the outer circumference thereof to draw the liquid crystal through the suction hole and to discharge the liquid crystal through the discharge hole; a connection unit to guide the liquid crystal discharged through the discharge hole of the piston; and a nozzle to dispense the liquid crystal received from the connection unit onto the substrate. 28. The device according to claim 27, further comprising:a first motor to drive the piston; a second motor; a rotational shaft connected to the second motor and having a screw thread thereon; and a capacity adjustment bracket to adjust a capacity of the cylinder by varying an angle of the cylinder according to the rotation of the rotational shaft, the capacity adjustment bracket having a first side coupled with the rotational shaft and a second side connected to the cylinder. 29. The device according to claim 28, wherein a manual lever is installed at the end of the rotational shaft to manually adjust the capacity adjustment bracket.30. The device according to claim 28, further comprising a LVDT (linear variable differential transformer) to measure a displacement of the capacity adjustment bracket.31. The device according to claim 27, wherein a pad is installed at a lower portion of the syringe, wherein the connection unit includes an injector needle, the injector needle being inserted into the syringe through the pad such that the liquid crystal flows from the syringe unit to the nozzle via the connection unit.32. The device according to claim 31, wherein the pad includes at least one of a silicone and a butyl rubber group.33. The device according to claim 27, further comprising a protection cap to protect the nozzle.34. A method of manufacturing a liquid crystal display device using the liquid crystal discharging device according to claim 27, comprising the steps of:dispensing liquid crystal from the liquid crystal dispensing device onto a first substrate; and attaching a second substrate with the first substrate so that the dispensed liquid crystal is disposed between the first and second substrates.
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