Apparatus for manufacturing bonded substrate

A liquid crystal drip device used in manufacture of a bonded substrate from a first substrate and a second substrate, the liquid crystal drip device comprising:

• a dispenser configured to drip a liquid crystal on at least either one of the first and second substrates;
• a measurement device configured to measure a drip amount of the liquid crystal dripped from the dispenser;
• a drip controller configured to control the drip amount of the liquid crystal dripped on said at least either one of first and second substrates based on a measurement result of the measurement device;
• a syringe configured to discharge the liquid crystal from the dispenser when pressurized, wherein the syringe includes a rotary valve body arranged in the syringe at a location between an upper section of the syringe and a nozzle of the syringe, the rotary valve body including a valve hole having a hole diameter substantially equal to an inner diameter of the syringe, and the rotary valve body is configured to open and close a liquid crystal passage in the syringe at the location between the upper section and the nozzle to selectively block a movement of the liquid crystal.

A liquid crystal drip device used in manufacture of a bonded substrate from a first substrate and a second substrate, the liquid crystal drip device comprising a dispenser configured to drip a liquid crystal on at least either one of the first and second substrates, wherein the dispenser includes:

• a syringe configured to retain the liquid crystal;
• a plunger configured to pressurize the liquid crystal;
• a discharge nozzle through which the liquid crystal is discharged;
• a rotary valve body arranged in the syringe at a location between the plunger and the discharge nozzle, the rotary valve body including a valve hole having a hole diameter substantially equal to an inner diameter of the syringe, and wherein the rotary valve body is rotated to open and close a liquid crystal passage in the syringe at the location between the plunger and the discharge nozzle to control a flow of the liquid crystal between the plunger and the discharge nozzle;
• and
• a drip controller configured to control a drip amount of the liquid crystal by controlling a displacement of the plunger.