Organic light emitting display apparatus and method of manufacturing the same

1. An organic light emitting display apparatus comprising:

a base substrate;

a light emitting unit on the base substrate and comprising an organic light emitting element;

a driving unit on the base substrate;

a sealing substrate opposite from the base substrate; and

a sealing unit between the base and sealing substrates and enclosing the light emitting unit, the sealing unit being at least partially on the driving unit,

wherein the sealing unit comprises a low melting inorganic material having a low temperature phase transition (LPT) characteristic,

wherein the sealing unit further comprises a dam unit at both sides of the sealing unit, and

wherein the dam unit comprises a glass tube.

2. The organic light emitting display apparatus according to claim 1 , wherein a phase transition temperature of the low melting inorganic material is a temperature at which the low melting inorganic material is fluid.

3. The organic light emitting display apparatus according to claim 1 , wherein a phase transition temperature of the low melting inorganic material is lower than a temperature at which electrical characteristics of elements of the driving unit are changed.

4. The organic light emitting display apparatus according to claim 1 , wherein a phase transition temperature of the low melting inorganic material is lower than a temperature at which physical and chemical characteristics of a material of the light emitting unit are changed.

5. The organic light emitting display apparatus according to claim 1 , wherein a phase transition temperature of the low melting inorganic material is from about 80° C. to about 120° C.

6. The organic light emitting display apparatus according to claim 1 , wherein the low melting inorganic material comprises at least one of tin oxide, stannous fluoride, phosphorous oxide, niobium oxide, boron phosphate, zinc oxide, or tungsten oxide.

7. The organic light emitting display apparatus according to claim 1 , wherein the sealing unit directly contacts the driving unit.

8. An organic light emitting display apparatus comprising:

a base substrate;

a light emitting unit on the base substrate and comprising an organic light emitting element;

a driving unit on the base substrate;

a sealing substrate opposite from the base substrate; and

a sealing unit between the base and sealing substrates and enclosing the light emitting unit, the sealing unit being at least partially on the driving unit,

wherein the sealing unit comprises a low melting inorganic material having a low temperature phase transition (LPT) characteristic, and

wherein the sealing unit further comprises frit at a side of the sealing substrate stacked with the low melting inorganic material, the low melting inorganic material being at a side of the base substrate.

9. The organic light emitting display apparatus according to claim 1 , wherein the base substrate and the sealing substrate comprise a glass material.

10. A method of manufacturing an organic light emitting display apparatus, the method comprising:

forming a light emitting unit comprising an organic light emitting element on a base substrate, and forming a driving unit located outside the light emitting unit on the base substrate;

forming a sealing unit comprising a low melting inorganic material having a low temperature phase transition (LPT) characteristic to enclose the light emitting unit on a sealing substrate;

aligning the base and sealing substrates so that the sealing unit at least partially overlaps the driving unit; and

bonding the base and sealing substrates such that the low melting inorganic material is at least partially directly joined to the driving unit by heating the low melting inorganic material to a phase transition temperature,

wherein the forming of the sealing unit comprises:

forming a dam unit comprising two sides of the sealing unit; and

filling an inside of the dam unit with the low melting inorganic material, and

wherein the forming of the dam unit comprises welding a glass tube on the sealing substrate.

11. A method of manufacturing an organic light emitting display apparatus, the method comprising:

forming a light emitting unit comprising an organic light emitting element on a base substrate, and forming a driving unit located outside the light emitting unit on the base substrate;

forming a sealing unit comprising a low melting inorganic material having a low temperature phase transition (LPT) characteristic to enclose the light emitting unit on a sealing substrate;

aligning the base and sealing substrates so that the sealing unit at least partially overlaps the driving unit; and

bonding the base and sealing substrates such that the low melting inorganic material is at least partially directly joined to the driving unit by heating the low melting inorganic material to a phase transition temperature,

wherein the forming of the sealing unit comprises:

forming frit on the sealing substrate;

forming a pyrolysis adhesive on the frit; and

forming a pallet including the low melting inorganic material on the pyrolysis adhesive.

12. The method of manufacturing an organic light emitting display apparatus according to claim 11 , wherein the forming of the sealing unit comprises irradiating the frit with a laser, decomposing the pyrolysis adhesive with heat, and laminating the frit and low melting inorganic material to directly contact each other.

13. The method of manufacturing an organic light emitting display apparatus according to claim 11 , wherein the pyrolysis adhesive comprises at least one of ethyl cellulose, polyimide, or a polyvinyl adhesive.

14. A method of manufacturing an organic light emitting display apparatus, the method comprising:

forming a light emitting unit comprising an organic light emitting element on a base substrate, and forming a driving unit located outside the light emitting unit on the base substrate;

forming a sealing unit comprising a low melting inorganic material having a low temperature phase transition (LPT) characteristic to enclose the light emitting unit on a sealing substrate;

aligning the base and sealing substrates so that the sealing unit at least partially overlaps the driving unit; and

bonding the base and sealing substrates such that the low melting inorganic material is at least partially directly joined to the driving unit by heating the low melting inorganic material to a phase transition temperature;

etching a recess unit in the sealing substrate to face the light emitting unit;

forming a protruding unit protruding from an edge of the sealing substrate, before the forming of sealing unit; and

forming a pallet comprising the low melting inorganic material on the protruding unit after the forming of the sealing unit.

15. The method of manufacturing an organic light emitting display apparatus according to claim 10 , wherein the phase transition temperature of the low melting inorganic material is a temperature at which fluidity occurs in the low melting inorganic material.

16. The method of manufacturing an organic light emitting display apparatus according to claim 10 , wherein in the heating of the low melting inorganic material to a phase transition temperature, the phase transition temperature of the low melting inorganic material is lower than a temperature at which electrical characteristics of elements of the driving unit change.

17. The method of manufacturing an organic light emitting display apparatus according to claim 10 , wherein in the heating of the low melting inorganic material to a phase transition temperature, the phase transition temperature of the low melting inorganic material is lower than a temperature at which physical and chemical characteristics of a material of the light emitting unit change.

18. The method of manufacturing an organic light emitting display apparatus according to claim 10 , wherein in the heating of the low melting inorganic material to a phase transition temperature, the phase transition temperature of the low melting inorganic material is from about 80° C. to about 120° C.

19. The method of manufacturing an organic light emitting display apparatus according to claim 10 , wherein the low melting inorganic material comprises at least one of tin oxide, stannous fluoride, phosphorous oxide, niobium oxide, boron phosphate, zinc oxide, or tungsten oxide.