Liquid crystal display device and fabrication method thereof

• US 6,310,667 B1
• Filed: 02/23/1999
• Issued: 10/30/2001
• Est. Priority Date: 02/23/1998
• Status: Expired due to Term

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi, Ltd.
• Inventors: Ono, Kikuo, Nakayoshi, Yoshiaki
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): NGUYEN, DUNG T
• Application Number:
  US09/256,461
• Time in Patent Office: 980 Days
• Field of Search: 349/42, 349/54, 349/55, 349/138, 349/149, 349/152, 349/192, 349/154, 349/43, 324/770
• US Class Current: 349/42
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/136204 Arrangements to prevent high voltage or static electricity failures
• CPC Class Codes: G02F 1/136254 Checking; Testing
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• 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

A method and apparatus for suppressing errors in a disconnecting inspection of wiring lines formed over a TFT substrate utilized for a liquid crystal display panel due to a defective contact between an inspection probe and an inspection terminal. A liquid crystal display has a liquid crystal display panel including a pair of substrates and a liquid crystal layer with a plurality of gate lines and a plurality of data lines formed on a main surface of one of the substrates adjacent to the liquid crystal layer. The plurality of gate lines extend in one direction, and the plurality of data lines extend in another direction transverse to the one direction and are spaced from the plurality of gate lines by a first insulating film. Switching elements and pixel electrodes are formed on the main surface. At least one of at least one of the plurality of data lines and at least one of the plurality of gate lines is electrically connected with an inspection terminal, and the inspection terminal extends at least partially over a second insulating film covering at least two other data lines disposed at one side of the at least one data line or at least two other gate lines disposed at one side of the at least one gate line.

Claims

1. A liquid crystal display substrate having a main surface, on which:

a plurality of gate lines extend in one direction;

a plurality of data lines extend in another direction transverse to the one direction and are spaced from the plurality of gate lines by a first insulating film;

switching elements are disposed to be turned ON with scanning signals fed through the gate lines;

pixel electrodes for feeding video signals from the data lines through the ON switching elements are disposed;

a second insulating film covers at least partially both the plurality of gate lines and the plurality of data lines;

wherein at least one of at least two adjacent data lines and at least two adjacent gate lines are electrically connected by at least one wiring line; and

at least one of the adjacent data lines and the adjacent gate lines connected by the wiring line has an inspection terminal connected thereto which has a portion provided on said second insulating film so as to extend at least partially over at least one of at least two other data lines disposed at one side of the at least one data line and at least two other gate lines disposed at one side of the at least one gate line.

2. A liquid crystal display substrate according to claim 1,

wherein the at least one wiring line is disposed at an end portion of said liquid crystal display substrate outside of substrate cutting lines.

3. A liquid crystal display device having the liquid crystal substrate of claim 1,

wherein the main surface of the liquid crystal display is disposed so as to confront another substrate through a liquid crystal layer to form a liquid crystal display panel.

4. A liquid crystal display device comprising a liquid crystal display panel including:

a pair of substrates and a liquid crystal layer, the pair of substrate being arranged to confront one another with the liquid crystal layer disposed therebetween;

a plurality of gate lines and a plurality of data lines, both of the plurality of gate lines and the plurality of data lines being formed on a main surface of one of the substrates adjacent to the liquid crystal layer and spaced from each other by a first insulating film, the plurality of gate lines extending in one direction and being juxtaposed along another direction transverse to the one direction, and the plurality of data lines extending in the another direction and being juxtaposed along the one direction;

switching elements formed on the main surface to be turned ON with scanning signals fed through the plurality of gate lines;

pixel electrodes formed on the main surface for receiving video signals from the plurality of data lines through the ON switching elements; and

a second insulating film formed over the plurality of gate lines, the plurality of data lines and the first insulating film;

wherein at least one of at least one of the plurality of data lines is electrically connected with an inspection terminal, and the inspection terminal extends at least partially over the second insulating film covering at least one of at least two of the plurality of data lines other than the at least one of the plurality of data lines disposed at one side of the plurality of data lines.

5. A liquid crystal display device comprising:

a pair of substrates facing one another with a predetermined distance therebetween, at least one of the pair of substrates having a region provided for displaying an image therein;

a liquid crystal layer sealed between the pair of substrates;

a plurality of first conductive members disposed on one of the pair of substrates to extend along a first direction from a display region on the one of the pair of substrates to a periphery thereof and juxtaposed along a second direction transverse to the first direction;

a first insulating layer covering the first conductive members other than at least one recess exposing a portion of at least one of the first conductive members at the periphery of the display region; and

at least one first terminal layer electrically connected with the at least one of the first conductive members at the portion thereof exposed by the at least one recess and extending from the at least one recess at least partially over the first insulating layer above another of the first conductive members adjacent to the at least one of the first conductive members.

6. The liquid crystal display device according to claim 5, wherein the first insulating layer has a plurality of the recesses for exposing a predetermined number of the first conductive members disposed at a predetermined interval therein respectively, and a plurality of the first terminal layers are formed corresponding to and extending from the respective recesses.

7. The liquid crystal display device according to claim 6, wherein the recesses and the first terminal layers extending therefrom respectively are formed on one side at a periphery of the display region.

8. The liquid crystal display device according to claim 7, further comprising another group of terminals disposed on another side at the periphery of the display region, wherein the first conductive members are extended throughout the display region, and each terminal of the another group is electrically connected with respective one of the first conductive members corresponding thereto.

9. The liquid crystal display device according to claim 7, wherein the first conductive members are extended throughout the display region, and at least one of the first conductive members connected with at least one of the first terminal layers and another of the first conductive members adjacent thereto extend to an opposite edge of the one of the substrates to the periphery at which the first terminal layer is disposed.

10. The liquid crystal display device according to claim 7, wherein the first terminal layers adjacent to one another are disposed alternatively in the first direction.

11. The liquid crystal display device according to claim 6, wherein the plurality of the recesses are formed as respective openings separated from each other by the first insulating layer.

12. The liquid crystal display device according to claim 6, wherein the plurality of the first recesses and the plurality of the terminal layers are formed for every two or more of the first conductive members.

13. The liquid crystal display device according to claim 12, wherein the plurality of the recesses and the plurality of the first terminal layers are formed for every two of the first conductive members, and the first conductive members disposed adjacent to one another are provided for different purpose in the liquid crystal display.

14. The liquid crystal display device according to claim 6, further comprising a plurality of pixel electrodes in the display region with respect to one of the first conductive members, wherein the pixel electrodes are formed on the first insulating layer.

15. The liquid crystal display device according to claim 6, further comprising a plurality of second conductive members other than the first conductive members formed on the one of the pair of substrates, wherein the plurality of second conductive members are substantially parallel to one another and extend in second direction transverse to the first direction and are spaced from the plurality of first conductive members by a second insulating layer.

16. The liquid crystal display device according to claim 15, wherein the plurality of second conductive members are disposed below the plurality of first conductive members, at least one of the second conductive members is connected with a second terminal layer, and the second terminal layer extends over the first insulating layer.

17. The liquid crystal display device according to claim 16, wherein the second terminal layer is connected with a portion of the at least one of the second conductive members exposed by a second recess, and the second recess is formed through the first and second insulating layers so as to extend the second terminal layer at least partially over the first insulating layer above another of the second conductive members adjacent to the at least one of the second conductive members.

18. The liquid crystal display device according to claim 5, wherein the at least one first terminal layer has a surface housing a step with respect to the at least one recess.

19. The liquid crystal display device according to claim 5, wherein the at least one terminal layer extends at least partially over the first insulating layer above at least two other of the first conductive members juxtaposed on one side of the at least one of the first conductive members.

20. The liquid crystal display device according to claim 19, wherein the at least one recess is filled with a material of the terminal layer.

21. A process for fabricating a liquid crystal display panel for a liquid crystal display device comprising the steps of:

preparing a first substrate;

forming a plurality of gate lines and a plurality of data lines disposed on a first main surface of the first substrates so that the plurality of gate lines extend in a first direction, and the plurality of data lines extend in a second direction transverse to the first direction and are spaced from the plurality of gate lines by a first insulating film;

forming at least one wiring line on the first main surface for electrically connecting at least one of at least two adjacent ones of the plurality of data lines and the plurality of gate lines;

forming switching elements on the first main surface to be turned ON with scanning signals fed through the plurality of gate lines;

forming pixel electrodes on the first main surface for feeding video signals from the plurality of data lines through the ON switching elements;

arranging at least one inspection terminal for at least one of the plurality of data lines and the plurality of gate lines so as to extend at least partially over a second insulating film formed above at least one of at least two of the plurality of data lines and at least two of the plurality of gate lines;

arranging the first substrate and a second substrate so as to confront the first main surface to a second main surface of the second substrate with a space therebetween; and

sealing a liquid crystal layer in the space between the first and second main surfaces.

22. The liquid crystal display device fabricating process according to claim 21,

wherein the at least one wiring line is disposed at an end portion of the first liquid crystal display substrate outside of a substrate cutting line thereof.

23. The liquid crystal display device fabricating process according to claim 21, further comprising the step of:

inspecting disconnection of the at least one of the plurality of data lines and the plurality of gate lines utilizing the at least one inspection terminal.

24. The liquid crystal display device fabricating process according to claim 23, further comprising the step of:

cutting the first substrate and the at least one wiring line after the inspection of disconnection of the at least one of the plurality of data lines and the plurality of gate lines.

25. A process for fabricating a liquid crystal display device comprising the steps of:

preparing a first substrate having a first main surface including a display region provided for displaying an image therein;

forming a plurality of first conductive members on the first main surface so as to be extend along a first direction from the display region to a periphery thereof and to be juxtaposed along a second direction transverse to the first direction;

forming a first insulating film over the plurality of first conductive members;

forming a plurality of openings in the first insulating film, each of the openings being provided in at least one of the display region and a periphery of the display region and each of the openings formed in the periphery exposes a portion of at least one of the plurality of first conductive members;

forming a conductive film on the insulating film including the openings; and

removing portions of the conductive film so that the conductive film extending from the opening in the display region forms a pixel electrode on the first insulating film and the conductive film extending from the opening in the periphery of the display region extends at least partially over the first insulating film formed above another of the first conductive members adjacent to the at least one of the first conductive members.

26. The process for fabricating the liquid crystal display device according to claim 25, wherein the plurality of openings on the first insulating film are formed by photolithography using a mask having patterns for both the display region and the periphery thereof.

27. The process for fabricating the liquid crystal display device according to claim 25, wherein the portions of the conducive film are removed by photolithography using a mask having patterns corresponding to both the pixel electrode and the terminal in the periphery of the display region.

28. A liquid crystal display device comprising a liquid crystal display panel including:

a pair of substrates and a liquid crystal layer, the pair of substrates being arranged to confront one another with the liquid crystal layer disposed therebetween;

a plurality of gate lines and a plurality of data lines, both of which are formed on a main surface of one of the substrates adjacent to the liquid crystal layer and spaced from each other by a first insulating film, the plurality of gate lines extending in one direction and being juxtaposed along another direction transverse to the one direction, and the plurality of data lines extending in the another direction and being juxtaposed the one direction;

switching elements formed on the main surface to be turned ON with scanning signals fed through the plurality of gate lines;

pixel electrodes formed on the main surface for receiving video signals from the plurality of data lines through the ON switching elements; and

a second insulating film formed over the plurality of gate lines, the plurality of data lines, and the first insulating film;

wherein at least one of at least one of the plurality of gate lines is electrically connected with an inspection terminal, and the inspection terminal extends at least partially over the second insulating film covering at least one of at least two of the plurality of gate lines other than the at least one of the plurality of gate lines disposed at one side of the plurality of gate lines.