Display substrate, method of manufacturing the same and display device having the same

• US 20070081106A1
• Filed: 06/23/2006
• Published: 04/12/2007
• Est. Priority Date: 06/23/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choo, Dae-Ho, Cho, Sung-Hwan, Yum, Ho-Nam
• Granted Patent: US 8,169,428 B2
• Time in Patent Office: Days
• US Class Current: 349/41
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making

Abstract

A display device includes silver-molybdenum alloy electrodes having high reflectivity despite annealing temperatures. The display may have a first display substrate, a second display substrate and a liquid crystal layer. The first display substrate includes signal-applying modules (e.g., TFTs) disposed on a first substrate each including an output terminal configured to output a data signal, a patterned insulation layer having contact holes that expose the output terminals, and silver-molybdenum alloy electrodes (made of silver and molybdenum) electrically connected to the output terminals. The silver-molybdenum alloy electrode is employed in the display device, thereby increasing reflectivity of the display device and improving display quality of an image displayed by the display device.

Claims

1. A display substrate comprising:

a signal-applying module disposed on a substrate and having an output terminal configured to output a data signal;

a patterned insulation layer having a contact hole that exposes the output terminal; and

a silver-molybdenum alloy electrode, comprising silver and molybdenum, electrically connected to the output terminal.

2. The display substrate of claim 1, wherein the signal-applying module further comprises:

a transistor-gate electrode protruding from a gate line that receives a timing signal;

a gate insulation layer configured to insulate the transistor-gate electrode;

a transistor channel in a semiconductor layer disposed on the gate insulation layer over the gate electrode; and

a transistor-source electrode protruding from a data line to input the data signal to the transistor channel,

wherein the output terminal is a transistor-drain terminal.

3. The display substrate of claim 1, wherein a textured pattern is formed on the patterned insulation layer.

4. The display substrate of claim 3, wherein the textured pattern is an embossed pattern.

5. The display substrate of claim 1, wherein the silver-molybdenum alloy electrode has about 99 percent by weight to about 95 percent by weight of silver (Ag) and about 1 percent by weight to about 5 percent by weight of molybdenum (Mo).

6. The display substrate of claim 1, wherein the silver-molybdenum alloy electrode has a plurality of openings having a polygon shape.

7. The display substrate of claim 6, wherein a transparent and conductive electrode is formed between the patterned insulation layer and the silver-molybdenum alloy electrode.

8. The display substrate of claim 7, wherein the transparent and conductive electrode includes at least one of indium tin oxide and indium zinc oxide.

9. A method of manufacturing a display substrate, comprising:

forming a signal-applying module on a substrate, the signal-applying module comprising an output terminal configured to output a data signal;

forming a patterned insulation layer covering the signal-applying module except for a contact hole that exposes a portion of the output terminal;

forming a silver-molybdenum alloy layer on the patterned insulation layer to be electrically connected, through the contact hole, to the output terminal; and

patterning the silver-molybdenum alloy layer to form a silver-molybdenum alloy electrode.

10. The method of claim 9, wherein the silver-molybdenum alloy layer has about 99 percent by weight to about 95 percent by weight of silver (Ag) and about 1 percent by weight to about 5 percent by weight of molybdenum (Mo).

11. The method of claim 9, wherein forming the patterned insulation layer further comprises embossing a pattern on the insulation layer.

12. The method of claim 9, further comprising forming a transparent and conductive electrode layer on the patterned insulation layer, after forming the patterned insulation layer and before forming the silver-molybdenum alloy layer.

13. The method of claim 12, wherein the silver-molybdenum alloy electrode has a plurality of openings.

14. The method of claim 9, further comprising, after forming the silver-molybdenum alloy electrode:

forming an alignment layer on the patterned insulation layer so as to cover the silver-molybdenum alloy electrode; and

baking the alignment layer at a temperature of about 150°

C. to about 250°

C.

15. The method of claim 9, further comprising, after forming the silver-molybdenum alloy electrode:

forming an alignment layer on the patterned insulation layer so as to cover the silver-molybdenum alloy electrode; and

baking the alignment layer at a temperature selected so as to prevent the silver-molybdenum alloy electrode from yellowing.

16. A display device comprising:

a first display substrate comprising;

a signal-applying module disposed on a first substrate and having an output terminal configured to output a data signal;

a patterned insulation layer having a contact hole that exposes the output terminal; and

a silver-molybdenum alloy electrode electrically connected to the output terminal.

17. The display device of claim 16, further comprising:

a second display substrate comprising a common electrode that is disposed on a second substrate facing the first substrate, the common electrode facing the silver-molybdenum alloy electrode; and

a liquid crystal layer disposed between the first and second display substrates.

18. The display device of claim 17, wherein the silver-molybdenum alloy electrode has about 99 percent by weight to about 95 percent by weight of silver (Ag) and about 1 percent by weight to about 5 percent by weight of molybdenum (Mo).

19. The display device of claim 17, wherein a transparent electrode is disposed in contact with the silver-molybdenum alloy electrode and the patterned insulation layer.

20. The display device of claim 19, wherein the transparent electrode is disposed between the silver-molybdenum alloy electrode and the patterned insulation layer.

21. The display device of claim 19, wherein the transparent electrode includes at least one of indium tin oxide and indium zinc oxide.