Liquid crystal display units with data line being formed of molybdenum alloy having chromium content

• US 6,707,512 B2
• Filed: 02/11/2003
• Issued: 03/16/2004
• Est. Priority Date: 11/10/2000
• Status: Expired due to Term

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi, Ltd.
• Inventors: Tamura, Katsumi, Onisawa, Kenichi, Takahashi, Takuya, Kawamura, Tetsuya, Ishii, Masahiro, Kasai, Tsutomu, Kaneko, Toshiki
• Primary Examiner(s): CHOWDHURY, TARIFUR RASHID
• Application Number:
  US10/361,630
• Publication Number:
  US 20030147020A1
• Time in Patent Office: 399 Days
• Field of Search: 349/42, 349/43, 349/139, 349/147, 257/59, 257/72
• US Class Current: 349/43
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes

Abstract

A liquid crystal display unit having one pair of substrates, a liquid crystal layer held between the pair of substrates, a plurality of scanning lines formed on one of the pair of substrates, a plurality of data lines which cross the scanning lines in matrix form, thin film transistors formed near the crossing points of the scanning lines and data lines, and pixel electrodes connected to the thin film transistors. A source electrode and a drain electrode of each thin film transistor, and each data line, are made of a molybdenum alloy having a chromium content in a range of 1.5 weight % to 5 weight %.

Claims

1. A liquid crystal display unit comprising one pair of substrates, a liquid crystal layer held between said pair of substrates, a plurality of scanning lines formed on one of said pairs of substrates, a plurality of data lines which cross said scanning lines in matrix form, thin film transistors formed near the crossing points of said scanning lines and data lines, and pixel electrodes connected to said thin film transistors, wherein a source electrode and a drain electrode of each thin film transistor, and each data line, are made of a molybdenum alloy having a chromium content in a range of 1.5 weight % to 5 weight %.

2. A liquid crystal display unit according to claim 1, wherein said liquid crystal display unit is constructed so as to bring said molybdenum alloy and an anisotropic conductive film into direct contact at a terminal portion of each data line.

3. A liquid crystal display unit according to claim 1, wherein each scanning line includes aluminum or an aluminum alloy and each pixel electrode is constructed using an indium tin oxide or indium zinc oxide composed mainly of an amorphous phase.

4. A liquid crystal display unit according to claim 1, wherein each scanning line is constructed into a film lamination having a lower layer which consists of aluminum or an aluminum alloy and an upper layer which consists of a molybdenum alloy having a zirconium content of at least 5 weight %, or a chromium content of at least 1.5 weight %, and each pixel electrode is constructed using an indium tin oxide or indium zinc oxide composed mainly of an amorphous phase.

5. A liquid crystal display unit comprising one pair of substrates, a liquid crystal layer held between said pair of substrates, a plurality of scanning lines formed on one of said pair of substrates, a plurality of data lines which cross said scanning signal lines in matrix form, thin film transistors formed near the crossing points of said scanning lines and data lines, and pixel electrodes connected to said thin film transistors, wherein a source electrode and drain electrode of each thin film transistor, and each data line, are each constructed into a film lamination consisting of a first electroconductive film and a second electroconductive film, wherein said first electroconductive film is an alloy composed mainly of molybdenum alloy having a chromium content in a range of 1.5 weight % to 5 weight %, and wherein said second electroconductive film is a molybdenum alloy located above said first electroconductive film and having a chromium content which is lower than the chromium content of said first electroconductive film.

6. A liquid crystal display unit according to claim 5, wherein said liquid crystal display unit is constructed so as to bring said molybdenum alloy and an anisotropic conductive film into direct contact at a terminal portion of each data line.

7. A liquid crystal display unit according to claim 5, wherein each scanning line includes aluminum or an aluminum alloy and each pixel electrode is constructed using an indium tin oxide or indium zinc oxide composed mainly of an amorphous phase.

8. A liquid crystal display unit according to claim 5, wherein each scanning line is constructed into a film lamination having a lower layer which consists of aluminum or an aluminum alloy and an upper layer which consists of a molybdenum alloy with a zirconium content of at least 5 weight %, or a chromium content of at least 1.5 weight %, and each pixel electrode is constructed using an indium tin oxide or indium zinc oxide composed mainly of an amorphous phase.

9. A liquid crystal display unit comprising one pair of substrates, a liquid crystal layer held between said pair of substrates, a plurality of scanning lines formed on one of said pair of substrates, a plurality of data lines which cross said scanning lines in matrix form, thin film transistors formed near the crossing points of said scanning lines and data lines, and at least one pair of pixel electrodes and opposed electrodes formed on one of said pair of substrates in a plurality of pixels in an area enclosed with said scanning lines and data lines, said pixel electrodes being supplied with data signals via said thin film transistors driven in accordance with scanning signals supplied from the scanning signal lines, and said opposed electrodes being supplied with reference voltages via opposed voltage signal lines formed over said pixels, wherein the data lines and the pixel electrodes are each made of an alloy consisting mainly of molybdenum alloy with a chromium content in a range of 1.5 weight % to 5 weight %.

10. A liquid crystal display unit according to claim 9, wherein each of said scanning lines includes aluminum or an aluminum alloy.

11. A liquid crystal display unit according to claim 9, wherein each scanning line is constructed into a film lamination having a lower layer which consists of aluminum or an aluminum alloy and an upper layer which consists of a molybdenum alloy with a zirconium content of at least 5 weight %, or a chromium of at least 1.5 weight %, and each pixel electrode is constructed using an indium tin oxide or indium zinc oxide composed mainly of an amorphous phase.

12. A liquid crystal display unit comprising one pair of substrates, a liquid crystal layer held between said pair of substrates, a plurality of scanning lines formed on one of said pair of substrates, a plurality of data lines which cross said scanning lines in matrix form, thin film transistors formed near the crossing points of said scanning lines and data lines, and at least one pair of pixel electrodes and opposed electrodes formed on one of said pair of substrates in a plurality of pixels in an area provided between said scanning lines and data lines, said pixel electrodes being supplied with data signals via said thin film transistors driven in accordance with scanning signals supplied from the scanning lines, and said opposed electrodes being supplied with reference voltages via opposed voltage signal lines formed over said pixels, wherein the data lines and the pixel electrodes are each constructed into a film lamination consisting of a first electroconductive film and a second electroconductive film, said first electroconductive film is an alloy consisting mainly of molybdenum alloy with a chromium content in a range of 1.5 weight % to 5 weight %, and said second electroconductive film is a molybdenum alloy located above said first electroconductive film and having a chromium content which is lower than the chromium content of said first electroconductive film.

13. A liquid crystal display unit according to claim 12, wherein each of said scanning lines includes aluminum or an aluminum alloy.

14. A liquid crystal display unit according to claim 12, wherein each scanning signal line is constructed into a film lamination having a lower layer which consists of aluminum or an aluminum alloy and an upper layer which consists of a molybdenum alloy with a zirconium content of at least 5 weight %, or a chromium content of at least 1.5 weight %, and each pixel electrode is constructed using an indium tin oxide or indium zinc oxide composed mainly of an amorphous phase.