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

• US 8,169,428 B2
• Filed: 06/23/2006
• Issued: 05/01/2012
• Est. Priority Date: 06/23/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Sung-Hwan, Yum, Ho-Nam, Choo, Dae-Ho
• Primary Examiner(s): Lao, Lun-Yi
• Assistant Examiner(s): Suteerawongsa, Jarurat
• Application Number:
  US11/474,112
• Publication Number:
  US 20070081106A1
• Time in Patent Office: 2,139 Days
• Field of Search: 349/56, 349/113, 359/237, 359/245, 359265-274, 359290-295, 359/315, 345/55, 345204-206
• US Class Current: 345/205
• 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 device comprising:

a first substrate; and

a second substrate combined with the first substrate to face the first substrate, the second 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;

a single layer silver-molybdenum alloy electrode as a reflective electrode, comprising silver and molybdenum, that both reflects light and receives the data signal through the output terminal to change arrangement of liquid crystal molecules interposed between the first and second substrates; and

a transparent and conductive electrode formed between the patterned insulation layer and the single layer silver-molybdenum alloy electrode,

wherein the single layer silver-molybdenum alloy electrode avoids hillocks and galvanic corrosion between the reflective electrode and the transparent and conductive electrode.

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

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

5. The display device of claim 1, wherein the single layer 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 device of claim 1, wherein the single layer silver-molybdenum alloy electrode has a plurality of openings having a polygon shape.

7. The display device of claim 1, wherein the transparent and conductive electrode includes at least one of indium tin oxide and indium zinc oxide.

8. A method of manufacturing a display device, comprising:

forming a first substrate; and

forming a second substrate combined with the first substrate to face the first substrate, forming, forming the second 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 transparent and conductive electrode on the patterned insulation layer;

forming a single layer silver-molybdenum alloy layer on the transparent and conductive electrode to be electrically connected, through the contact hole, to the output terminal; and

patterning the single layer silver-molybdenum alloy layer to form a single layer silver-molybdenum alloy electrode as a reflective electrode that both reflects light and receives the data signal through the output terminal to change arrangement of liquid crystal molecules between the first and second substrates,

wherein the single layer silver-molybdenum alloy electrode avoids hillocks and galvanic corrosion between the reflective electrode and the transparent and conductive electrode.

9. The method of claim 8, wherein the single layer 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).

10. The method of claim 8, wherein forming the patterned insulation layer further comprises embossing a pattern on the insulation layer.

11. The method of claim 8, wherein the single layer silver-molybdenum alloy electrode has a plurality of openings.

12. The method of claim 8, further comprising, after forming the single layer silver-molybdenum alloy electrode:

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

baking the alignment layer at a temperature of about 150°

C. to about 250°

C.

13. The method of claim 8, further comprising, after forming the single layer silver-molybdenum alloy electrode:

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

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