Fluid injection method and apparatus and display panel

1. A fluid injection apparatus comprising:

a fluid supply apparatus including a thread grooved shaft, a rotation transmission unit, and a suction port, said rotation transmission unit being operable to rotate said thread grooved shaft about a center axis of said thread grooved shaft, and said suction port being provided for introducing a fluid; and

a piston portion including a piston, an axial driving unit, and a discharge port, said piston being disposed in a housing, said axial driving unit being operable to move said piston relative to said housing in an axial direction, and said discharge port being provided for discharging the fluid,

wherein said fluid supply apparatus is connected to said piston portion through a flow passage,

wherein a clearance is formed between said piston and a face opposing said piston, said face having a protruding portion,

wherein a longitudinal axis of said thread grooved shaft is slanted with respect to a longitudinal axis of said piston,

wherein said fluid supply apparatus is configured to supply a continuous flow of the fluid to said piston portion,

wherein said piston portion is configured to convert the continuous flow to an intermittent flow by utilizing a pressure change caused by moving said piston in the axial direction during continuous injection, and

wherein a discharge quantity of the intermittent flow is adjustable by adjusting a number of revolutions of said thread grooved shaft of said fluid supply apparatus.

2. The fluid injection apparatus of claim 1 , wherein said housing includes said face opposing said piston.

3. The fluid injection apparatus of claim 1 , further comprising:

a fluid resistance portion disposed in said flow passage,

wherein a volume of said flow passage between said fluid resistance portion and said piston together with a volume enclosed by said fluid resistance portion is less than a volume of said flow passage between said fluid supply apparatus and said fluid resistance portion together with a volume of a portion of said fluid supply apparatus filled with the fluid, and

wherein said piston portion is configured to continuously inject the fluid from said discharge port to a discharge target by utilizing a pressure change caused by moving said piston in the axial direction during continuous injection.

4. The fluid injection apparatus of claim 1 , wherein said piston is disposed in a cylinder, and wherein an end of said piston nearest said discharge port is a tapered end and said cylinder includes a recess configured to receive said tapered end of said piston.

5. The fluid injection apparatus of claim 4 , wherein said discharge port is disposed in said cylinder at a side of said cylinder which is opposite said tapered end of said piston.

6. The fluid injection apparatus of claim 1 , wherein said piston is disposed in a cylinder, said cylinder including said face opposing said piston, and wherein said protruding portion is disposed in said clearance so as to form a fluid resistance portion.

7. The fluid injection apparatus of claim 1 , wherein said piston is disposed in a cylinder, said cylinder including said face opposing said piston such that said clearance is formed between said cylinder and said piston, wherein said flow passage connects said clearance and said fluid supply apparatus, and wherein a fluid resistance portion is disposed in said flow passage and on a side of said flow passage nearest said clearance.

8. The fluid injection apparatus of claim 1 , further comprising:

a fluid resistance portion,

wherein a minimum clearance formed in said fluid resistance portion is more than five times greater than a diameter of particles contained in the fluid.

9. The fluid injection apparatus of claim 1 , wherein said housing includes a cylinder, said piston being disposed in said cylinder, said cylinder including said face opposing said piston such that said clearance is formed between said cylinder and said piston, and

wherein said protruding portion extends into said clearance in a direction toward said piston.

10. The fluid injection apparatus of claim 1 , wherein said housing includes a cylinder, said piston being disposed in said cylinder, said cylinder including said face opposing said piston such that said clearance is formed between said cylinder and said piston,

wherein said protruding portion extends into said clearance in a direction toward said piston, and

wherein a distance between said piston and said face at a region below said protruding portion is greater than a distance between said protruding portion and said piston.

11. The fluid injection apparatus of claim 1 , wherein said housing includes a cylinder, said piston being disposed in said cylinder, said cylinder including said face opposing said piston such that said clearance is formed between said cylinder and said piston,

wherein said protruding portion extends into said clearance in a direction toward said piston,

wherein said flow passage penetrates said cylinder at a region above said protruding portion, and

wherein a distance between said piston and said face at a region below said protruding portion is greater than a distance between said protruding portion and said piston, and a distance between said piston and said face at said region above said protruding portion is greater than a distance between said protruding portion and said piston.