Flat fluorescent lamp and method of manufacturing the same

Abstract

Various structures are disclosed to provide flat fluorescent lamps adapted to provide improved optical characteristics by reducing sodium elution from one or more glass plates. Related methods of manufacture are also provided. In one example, a flat fluorescent lamp includes a first plate and a second plate adapted to form a plurality of discharge chambers in combination with the first plate. A first elution preventive layer is provided on an inner surface of the second plate. A first fluorescent layer is provided above an inner surface of the first plate. A second fluorescent layer is provided above the first elution preventive layer. In another example, the first and second plates comprise sodalime glass. In another example, the elution preventive layer is adapted to prevent sodium eluted from the second plate from exceeding a predetermined sodium elution amount.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a flat fluorescent lamp in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along the line I-I′ of the flat fluorescent lamp of FIG. 1 in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along the line II-II′ of the flat fluorescent lamp of FIG. 1 in accordance with an embodiment of the present invention;

FIG. 4 is a cross-sectional view of another flat fluorescent lamp in accordance with an embodiment of the present invention;

FIGS. 5 and 6 are cross-sectional views showing process steps for forming a flat fluorescent lamp in accordance with an embodiment of the present invention; and,

FIG. 7 is an exploded perspective view of a LCD in accordance with an embodiment of the present invention.

Claims

1. A flat fluorescent lamp comprising: a first plate;a second plate adapted to form a plurality of discharge chambers in combination with the first plate;a first elution preventive layer on an inner surface of the second plate;a first fluorescent layer above an inner surface of the first plate; anda second fluorescent layer above the first elution preventive layer.

2. The flat fluorescent lamp of claim 1, wherein the first elution preventive layer comprises at least one selected from the group consisting of: silicon oxide, silicon nitride, and aluminum oxide.

3. The flat fluorescent lamp of claim 1, wherein the first and second plates comprise sodalime glass.

4. The flat fluorescent lamp of claim 1, wherein the second plate comprises: chamber portions separated apart from the first plate to form the discharge chambers;partition portions adapted to separate the discharge chambers; andsealing portions at edges of the second plate.

5. The flat fluorescent lamp of claim 1, further comprising a reflective layer between the first plate and the first fluorescent layer.

6. The flat fluorescent lamp of claim 5, further comprising a second elution preventive layer between the first plate and the reflective layer.

7. The flat fluorescent lamp of claim 5, further comprising: a first protective layer between the reflective layer and the first fluorescent layer; anda second protective layer between the first elution preventive layer and the second fluorescent layer.

8. A flat fluorescent lamp comprising: a first plate;a second plate adapted to form a plurality of discharge chambers in combination with the first plate; anda first elution preventive layer on an inner surface of the second plate and adapted to prevent sodium eluted from the second plate from exceeding a predetermined sodium elution amount.

9. The flat fluorescent lamp of claim 8, wherein the sodium elution amount is in a range of about 0 wt % to about 10 wt %.

10. The flat fluorescent lamp of claim 8, wherein the first elution preventive layer comprises at least one selected from the group consisting of: silicon oxide, silicon nitride, and aluminum oxide.

11. The flat fluorescent lamp of claim 8, further comprising: a first fluorescent layer above an inner surface of the first plate; anda second fluorescent layer above the first elution preventive layer.

12. A liquid crystal display (LCD) device comprising: a LCD panel adapted to display images;a driving circuit adapted to provide a plurality of data signals and gate signals to the LCD panel;a flat fluorescent lamp configured to provide light to the LCD panel, wherein the flat fluorescent lamp comprises: a first plate,a second plate adapted to form a plurality of discharge chambers in combination with the first plate,a first elution preventive layer on an inner surface of the second plate and adapted to prevent sodium eluted from the second plate from exceeding a predetermined sodium elution amount,a first fluorescent layer above an inner surface of the first plate, anda second fluorescent layer above the first elution preventive layer; andan inverter adapted to provide a discharge voltage to the flat fluorescent lamp.

13. A method for manufacturing a flat fluorescent lamp, the method comprising: forming a first fluorescent layer above an inner surface of a first plate;molding a second plate to have a desired shape;forming a first elution preventive layer on an inner surface of the second plate;forming a second fluorescent layer above the first elution preventive layer; andcombining the first and second plates to form a plurality of discharge chambers, wherein the inner surfaces of the first and second plates face each other.

14. The method of claim 13, wherein the first elution preventive layer comprises at least one selected from the group consisting of: silicon oxide, silicon nitride, and aluminum oxide.

15. The method of claim 13, wherein the first and second plates comprise sodalime glass.

16. The method of claim 13, wherein the first elution preventive layer is formed by a chemical vapor deposition (CVD) process.

17. The method of claim 13, further comprising forming a reflective layer between the first plate and the first fluorescent layer.

18. The method of claim 17, further comprising forming a second elution preventive layer between the first plate and the reflective layer.

19. The method of claim 17, further comprising: forming a first protective layer between the reflective layer and the first fluorescent layer; andforming a second protective layer between the first elution preventive layer and the second fluorescent layer.

20. The method of claim 13, further comprising preventing sodium eluted from the second plate from exceeding a predetermined sodium elution amount.