Array substrate and display unit using it and production method for array substrate

• US 20080198108A1
• Filed: 01/23/2008
• Published: 08/21/2008
• Est. Priority Date: 06/19/2000
• Status: Abandoned Application

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Aoki, Hironori
• Application Number:
  US12/011,194
• Publication Number:
  US 20080198108A1
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/13458 Terminal pads
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52

Abstract

The present invention provides an array substrate in which delay in signal transmission is reduced and provides a display device in which superior display quality is achieved, by using wirings of low resistivity, and moreover, by suppressing increase in wiring resistance caused by contact resistance. A display area in which pixel electrodes (5) are formed, a gate line (2) arranged between the pixel electrodes, a data line (4) crossing over the gate line, a terminal to which a scanning signal for the gate line is applied, an extended scanning line (14), formed from a conductive film of different layer from that for the gate line, for connecting the collected auxiliary capacitance line with the terminal, an auxiliary capacitance line (11) arranged in parallel to the gate line, a collected auxiliary capacitance line (13) arranged in parallel to the signal line and electrically connected to the auxiliary capacitance line, a terminal to which a common signal is applied, and an extended auxiliary capacitance line (15), formed from a conductive film of different layer from that for the collected auxiliary capacitance line, for connecting the collected auxiliary capacitance line with the terminal are formed.

Claims

1. An array substrate comprising:

a display area in which pixel electrodes are formed,

a scanning line formed of a low resistivity metal, said scanning line being arranged between the pixel electrodes,

a signal line formed of a high melting point metal selected from the group consisting of chrome, molybdenum, tantalum and alloys thereof, said signal line crossing over the scanning line interposing an insulating layer therebetween,

a first terminal to which a scanning signal is applied,

an extended scanning line formed from a conductive film for connecting the scanning line with the first terminal, said extended scanning line being formed only of the same conductive film as for said signal line,

an auxiliary capacitance line arranged parallel to the scanning line,

a collected auxiliary capacitance line arranged in parallel to the signal line and electrically connected to the auxiliary capacitance line,

a second terminal to which a common signal is applied, and

an extended auxiliary capacitance line for connecting the collected auxiliary capacitance line with the second terminal for the common signal, said extended auxiliary capacitance line being formed only of the same conductive film as for said signal line, wherein the auxiliary capacitance line, the collected auxiliary capacitance line and the scanning line are formed from the conductive film of the same layer.

5. The array substrate of claim 1, wherein the extended scanning line is formed only of a same conductive film for the pixel electrodes, instead of a same conductive film for the signal line.

6. The array substrate of claim 1, wherein the extended scanning line is electrically connected to the scanning line at the neighborhood of the display area and electrically connected to the first terminal for the scanning signal at the neighborhood of the first terminal.

8. The array substrate of claim 1, wherein the extended auxiliary capacitance line is formed only of a same conductive film for the and the pixel electrodes, instead of a same conductive film for the signal line.

9. The array substrate of claim 8, wherein the extended auxiliary capacitance line is electrically connected to the collected auxiliary capacitance line at the neighborhood of the display area and electrically connected to the second terminal for the common signal at the neighborhood of the second terminal.

11. The array substrate of claim 1, wherein the collected auxiliary capacitance line and the extended scanning line are crossing, interposing an insulating layer therebetween.

12. The array substrate of claim 1, wherein aluminum or aluminum alloy is used for material of the scanning line.

13. The array substrate of claim 1, wherein partly or wholly nitridated aluminum or partly or wholly nitridated aluminum alloy is used for material of the scanning line.

15. The array substrate of claim 1, wherein the scanning line and the extended scanning line are electrically connected via a conductive film of the same layer as that for the pixel electrode.

16. The array substrate of claim 1, wherein the collected auxiliary capacitance line and the extended auxiliary capacitance line are electrically connected via a conductive film of the same layer as that for the pixel electrode.

17. The array substrate of claim 1, wherein either of the scanning line or the extended scanning line is formed in a grid or ladder like shape at a region in which the scanning line and the extended scanning line are overlapped within a connecting portion between the scanning line and the extended scanning line.

18. The array substrate of claim 1, wherein either of the collected auxiliary capacitance line or the extended auxiliary capacitance line is formed in a grid or ladder like shape at a region in which the collected auxiliary capacitance line and the extended auxiliary capacitance line are overlapped within a connecting portion between the collected auxiliary capacitance line and the extended auxiliary capacitance line.

2. (canceled)

3. An array substrate comprising:

a display area in which pixel electrodes are formed,

a scanning line formed of a low resistivity metal, said scanning line being arranged between the pixel electrodes,

an auxiliary capacitance line arranged in parallel to the scanning line,

a signal line formed of a high melting point metal selected from the group consisting of chrome, molybdenum, tantalum and alloys thereof, said signal line crossing over the scanning line and the auxiliary capacitance line interposing an insulating layer therebetween,

a collected auxiliary capacitance line arranged in parallel to the signal line and electrically connected to the auxiliary capacitance line,

a terminal to which a common signal is applied, and

an extended auxiliary capacitance line formed from a conductive film for connecting the collected auxiliary capacitance line with the terminal, said extended auxiliary capacitance line being formed only of the same conductive film as for said signal line.

4. (canceled)

7. (canceled)

10. (canceled)

14. (canceled)

19. (canceled)

20. (canceled)

21. (canceled)

22. An array substrate comprising:

a display area in which pixel electrodes are formed,

a scanning line formed of a low resistivity metal, said scanning line being arranged between the pixel electrodes,

a signal line formed of a high melting point metal selected from the group consisting of chrome, molybdenum, tantalum and alloys thereof, said signal line crossing over the scanning line interposing an insulating layer therebetween,

a terminal to which a scanning signal is applied, and

an extended scanning line for connecting the scanning line with the terminal, said extended scanning line being formed only of the same conductive film as for said signal line, wherein either of the scanning line or the extended scanning line is formed in a grid or ladder like shape at a region in which the scanning line and the extended scanning line are overlapped within a connecting portion between the scanning line and the extended scanning line.

23. An array substrate comprising:

a display area in which pixel electrodes are formed,

a scanning line formed of low resistivity metal, said scanning line being arranged between the pixel electrodes,

a signal line formed of high melting point metal selected from the group consisting of chrome, molybdenum, tantalum and alloys thereof, said signal line crossing over the scanning line interposing an insulating layer therebetween,

a terminal to which a scanning signal is applied,

an extended scanning line for connecting the scanning line with the terminal, said extended scanning line being formed only of the same conductive film as for said signal line, and

a connecting portion in which the scanning line and the extended scanning line are overlapped, wherein the connecting portion comprises at least two sets of contact holes, wherein each set of contact holes comprise a first contact hole and a second contact hole for contacting either the scanning line or the extended scanning line, and a third contact hole disposed between the first contact hole and the second contact hole for contacting either of the scanning line or the extended scanning line not contacted by the first contact hole and the second contact hole.

24. An array substrate comprising:

a display area in which pixel electrodes are formed,

a scanning line formed of low resistivity metal, said scanning line being arranged between the pixel electrodes,

an auxiliary capacitance line arranged in parallel to the scanning line,

a signal line formed of a high melting point metal selected from the group consisting of chrome, molybdenum, tantalum and alloys thereof, said signal line crossing over the scanning line and the auxiliary capacitance line interposing an insulating layer therebetween,

a collected auxiliary capacitance line arranged in parallel to the signal line and electrically connected to the auxiliary capacitance line,

a terminal to which a common signal is applied,

an extended auxiliary capacitance line for connecting the collected auxiliary capacitance line with the terminal, said extended auxiliary capacitance line being formed only of the same conductive film as for said signal line, and

a connecting portion in which the collected auxiliary capacitance line and the extended auxiliary capacitance line are overlapped, wherein the connecting portion comprises at least two sets of contact holes,

wherein each set of contact holes comprise a first contact hole and a second contact hole for contacting either the collected auxiliary capacitance line or the extended auxiliary capacitance line, and a third contact hole disposed between the first contact hole and the second contact hole for contacting either of the collected auxiliary capacitance line or the extended auxiliary capacitance line not contacted by the first contact hole and the second contact hole.