Liquid crystal display device

• US 9,411,466 B2
• Filed: 05/01/2015
• Issued: 08/09/2016
• Est. Priority Date: 06/08/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Matsumoto, Shuuichirou
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): Rosario, Nelson
• Application Number:
  US14/702,619
• Publication Number:
  US 20150234532A1
• Time in Patent Office: 466 Days
• Field of Search: 345/38, 345/50, 345 87-104, 345/156, 345173-179, 178 1801- 1809, 178/18.11, 178 1901- 1907
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

In a liquid crystal display device, a second substrate includes a detection electrode of a touch panel, pixels include pixel electrodes and counter electrodes, the counter electrodes are divided into a plurality of blocks, the counter electrodes of the divided blocks are provided in common to the pixels on a plurality of display lines being side by side, the counter electrodes of the divided blocks are used as scanning electrodes of the touch panel as well, the liquid crystal display device includes a semiconductor chip configured to supply a counter voltage and a touch panel scanning voltage to the counter electrodes of the divided blocks, the semiconductor chip includes a first terminal group formed on a side of a display area side configured by the plurality of pixels.

Claims

1. A liquid crystal display device comprising:

a first substrate including a plurality of pixel electrodes and a plurality of common electrodes;

a second substrate including a plurality of detection electrodes of a touch panel;

a plurality of pixels including the pixel electrode and common electrode, and forming a display area;

a plurality of video lines extending along a first direction and formed above the first substrate; and

a semiconductor chip configured to supply a common voltage and a touch panel scanning voltage to the common electrodes, and a video signal to the plurality of video lines,

wherein

the common electrode is overlapped to the pixel electrode of the pixels on the plurality of video lines, and used as a scanning electrodes of the touch panel,

the semiconductor chip includes a first long side and a second long side opposed to the first long side,

the first long side extends along a second direction intersected with the first direction, and is located closer to the display area than the second long side,

a plurality of first terminals of the semiconductor chip electrically connect with the plurality of common electrodes respectively,

a plurality of second terminals of the semiconductor chip electrically connect with the plurality of video lines respectively, and

the plurality of first terminals is located closer to an end of the first long side than the plurality of second terminals.

2. The liquid crystal display device according to claim 1,

further comprising a plurality of scanning lines for inputting a scanning voltage to the pixels and formed above the first substrate,

a scanning line driving circuit configured to supply the scanning voltage to the plurality of scanning lines,

and

a plurality of scanning line driving circuit wirings electrically connecting with the scanning line driving circuit.

3. The liquid crystal display device according to claim 2,

wherein

a plurality of third terminals of the semiconductor chip electrically connect with the plurality of scanning line driving circuit wirings respectively.

4. The liquid crystal display device according to claim 3,

wherein

the plurality of third terminals is disposed above a portion where is closer to the second long side than the first long side.

5. The liquid crystal display device according to claim 1, further comprising

a plurality of dummy electrodes formed above the second substrate, wherein

a pair of the dummy electrodes are formed both sides of the detection electrode.

6. The liquid crystal display device according to claim 5, further comprising

a main flexible printed circuit board and a sub flexible printed circuit board,

wherein

the main flexible printed circuit board electrically connects with the semiconductor chip, and

the sub flexible printed circuit board electrically connects with the detection electrode.

7. The liquid crystal display device according to claim 6,

wherein

the detection electrode has a T-shaped detection terminal,

the T-shaped detection terminal is electrically connected with the sub flexible printed circuit board and expands from the detection electrode to the dummy electrode.

8. A liquid crystal display device comprising:

a first substrate including a plurality of pixel electrodes and a plurality of counter electrodes;

a second substrate including a plurality detection electrodes of a touch panel;

a plurality of pixels including the pixel electrode and the counter electrode, and arranged in a matrix shape for forming a display area;

a plurality of video lines extending along a first direction; and

a semiconductor chip configured to supply a common voltage and a touch panel scanning voltage to the counter electrodes, and a video signal to the plurality of video lines,

wherein

the counter electrode is overlapped to the pixel electrode of the pixels on the plurality of video lines, and used as a scanning electrodes of the touch panel,

the semiconductor chip includes a first long side and a second long side opposed to the first long side,

the first long side extends along a second direction intersected with the first direction, and is disposed nearer to the display area than the second long side,

a plurality of first terminals of the semiconductor chip electrically connect with the counter electrodes respectively,

a plurality of second terminals of the semiconductor chip electrically connect with the plurality of video lines respectively,

the plurality of second terminal is disposed above a portion where is nearer to the first long side than the second long side, and

the plurality of first terminals is disposed nearer to an end of the first long side than the plurality of second terminals.

9. The liquid crystal display device according to claim 8,

further comprising a plurality of scanning lines for inputting a scanning voltage to the pixels and formed above the first substrate,

a scanning line driving circuit configured to supply the scanning voltage to the plurality of scanning lines,

and

a plurality of scanning line driving circuit wirings electrically connecting with the scanning line driving circuit.

10. The liquid crystal display device according to claim 9,

wherein

a plurality of third terminals of the semiconductor chip electrically connects with the plurality of scanning line driving circuit wirings respectively.

11. The liquid crystal display device according to claim 10,

wherein

the plurality of third terminals is disposed above a portion where is nearer to the second long side than the first long side.

12. The liquid crystal display device according to claim 8, further comprising

a plurality of dummy electrodes formed above the second substrate, wherein

a pair of the dummy electrodes are formed both sides of the detection electrode.

13. The liquid crystal display device according to claim 12, further comprising

a main flexible printed circuit board and a sub flexible printed circuit board,

wherein

the main flexible printed circuit board electrically connects with the semiconductor chip, and

the sub flexible printed circuit board electrically connects with the detection electrode.

14. The liquid crystal display device according to claim 12,

wherein

the detection electrode has a T-shaped detection terminal,

the T-shaped detection terminal expands from the detection electrode to the dummy electrode.