Liquid crystal dispensing apparatus
View Patent ↗A liquid crystal dispensing apparatus for dispensing liquid crystal onto a substrate includes a liquid crystal container, a nozzle structure, and a valve structure. The liquid crystal container contains the liquid crystal to be dispensed. The nozzle structure is disposed at a lower portion of the liquid crystal container, and the liquid crystal is dispensed through the nozzle structure onto the substrate. The valve structure is disposed to control flow of the liquid crystal from the liquid crystal container to the nozzle structure in accordance with a gas pressure provided from a gas input of the liquid crystal container. The liquid crystal container may be formed of substantially entirely of metal. An inside surface of the liquid crystal container may include a fluorine resin.
1. A liquid crystal dispensing apparatus for dispensing liquid crystal onto a substrate, comprising:
a liquid crystal container for containing the liquid crystal to be dispensed, the liquid crystal container being formed substantially entirely of a metal with a first fluorine resin film being formed on an inside surface of the liquid crystal container such that the liquid crystal directly contacts the liquid crystal container;
a gas supply connected to the container to provide a gas pressure to provide a driving force for dispensing the liquid crystal;
a needle sheet formed of a metal and disposed at a lower portion of the liquid crystal container, the needle sheet defining a discharging hole through which the liquid crystal is dispensed to the substrate; and
a needle member formed substantially entirely of a ferromagnetic metal with a second fluorine resin film being formed on a surface of the needle member, the needle member being disposed in the liquid crystal container moveable between an open position and a closed position;
a biasing member to bias the needle member toward the closed position in contact with the needle sheet to prevent flow of the liquid crystal though discharging hole of the needle sheet; a solenoid disposed to provide a magnetic field such that the needle member is moved by a magnetic force to the open position such that flow of the liquid crystal through the discharging hole of the needle sheet is permitted; and
a nozzle structure defining a discharging passage therein to dispense liquid crystal drops onto the substrate, the nozzle structure being formed substantially entirely of a metal with a third fluorine resin film formed on the surface of the discharging passage.
2. The liquid crystal dispensing apparatus for dispensing liquid crystal onto a substrate according to claim 1 , wherein the solenoid includes a magnetic bar disposed above the needle member, a magnetic field being generated by the solenoid in the magnetic bar to magnetically attract the needle member and to move the needle member to the open position.