Liquid crystal display device

• US 9,052,774 B2
• Filed: 06/07/2013
• Issued: 06/09/2015
• 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:
  US13/912,242
• Publication Number:
  US 20130328807A1
• Time in Patent Office: 732 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;

a second substrate including a detection electrode of a touch panel;

liquid crystal held between the first substrate and the second substrate;

pixel electrodes and counter electrodes configured to control orientation of the liquid crystal in each of a plurality of pixels arranged in a matrix shape; and

a semiconductor chip configured to supply a counter voltage and a touch panel scanning voltage to the counter electrodes, wherein

the counter electrodes are divided into a plurality of blocks, common to the pixels on a plurality of display lines being side by side, and used as scanning electrodes of the touch panel as well, and

in the semiconductor chip, terminals for supplying the counter voltage and the touch panel scanning voltage to the counter electrodes of the divided blocks are a plurality of terminals arranged on both sides of the semiconductor chip in a first terminal group formed on a side of a display area side, which is configured by the plurality of pixels, of the semiconductor chip.

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

when the number of divisions of the counter electrodes is represented as M (1≦

M≦

24), the plurality of terminals arranged on both the sides of the semiconductor chip are M terminals A1 arranged at one end and M terminals A2 arranged at the other end, and

the semiconductor chip can be switched to a mode for supplying, from each of the plurality of terminals A1 and the plurality of terminals A2, the touch panel scanning voltage to the counter electrodes sequentially selected among the counter electrodes of the divided blocks and supplying the counter voltage to the counter electrodes other than the selected counter electrodes and a mode for outputting the counter voltage from first to Nth (1≦

N<

24) terminals among the M terminals A1 and the M terminals A2 and outputting the touch panel scanning voltage from the remaining Nth to Mth terminals.

3. The liquid crystal display device according to claim 2, wherein the N is N=M/2.

4. The liquid crystal display device according to claim 2, wherein

the first substrate includes:

a plurality of scanning lines for inputting a scanning voltage to the pixels; and

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

the scanning line driving circuit is a circuit incorporated in an inside of the liquid crystal display panel and configured using only either n-type or p-type transistor, and

the semiconductor chip supplies, from each of the plurality of terminals A1 and the plurality of terminals A2, the touch panel scanning voltage to the counter electrodes sequentially selected among the counter electrodes of the divided blocks and supplies the counter voltage to the counter electrodes other than the selected counter electrodes.

5. The liquid crystal display device according to claim 2, wherein

the first substrate includes:

a plurality of scanning lines for inputting a scanning voltage to the pixels;

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

a counter electrode selecting circuit configured to select the counter electrodes of the divided blocks,

the counter electrode selecting circuit is arranged between the scanning line driving circuit and a display area,

the counter electrode selecting circuit is a circuit incorporated in the inside of the liquid crystal display panel and having a CMOS circuit configuration, and

the semiconductor chip supplies, to the counter electrode selecting circuit, the counter voltage from first to Nth (1≦

N<

24) terminals among the M terminals A1 and the M terminals A2 and supplies the touch panel scanning voltage from the remaining Nth to Mth terminals.

9. The liquid crystal display device according to claim 5 or 8, wherein

the first counter electrode selecting circuit and the second counter electrode selecting circuit include:

address decoder circuits configured to select the counter electrodes of the blocks; and

selection circuits configured to supply the touch panel scanning voltage to the counter electrodes of the blocks selected by the address decoder circuits and supply the counter voltage to the counter electrodes of the blocks not selected by the address decoder circuits.

12. The liquid crystal display device according to claim 1, 6, or 10, wherein

the counter electrodes are provided in common to the pixels on one display line on the first substrate, and

the counter electrodes on a plurality of display lines being side by side configure the counter electrodes electrically connected on the first substrate and divided in a unit of the block.

6. A liquid crystal display device comprising:

a first substrate;

a second substrate including a detection electrode of a touch panel;

liquid crystal held between the first substrate and the second substrate;

pixel electrodes and counter electrodes configured to control orientation of the liquid crystal in each of a plurality of pixels arranged in a matrix shape;

a plurality of scanning lines for inputting a scanning voltage to the pixels;

a first scanning line driving circuit and a second scanning line driving circuit arranged on both side of a display area, which is configured by the plurality of pixels, on an inside of the liquid crystal display panel and configured to supply the scanning voltage to the plurality of scanning lines; and

a semiconductor chip configured to supply a counter voltage and a touch panel scanning voltage to the counter electrodes of the divided blocks and supply a display control signal to the first scanning line driving circuit and the second scanning line driving circuit, wherein

the counter electrodes are divided into a plurality of blocks, common to the pixels on a plurality of display lines being side by side, and used as scanning electrodes of the touch panel as well,

the semiconductor chip includes a second terminal group formed on a side on an opposite side of the display area configured by the plurality of pixels,

a plurality of terminals arranged at one end of the semiconductor chip in the second terminal group are terminals B1 for supplying the display control signal to the first scanning line driving circuit, and

a plurality of terminals arranged at the other end of the semiconductor chip in the second terminal group are terminals B2 for supplying the display control signal to the second scanning line driving circuit.

7. The liquid crystal display device according to claim 6, wherein a type of the display control signal supplied from the plurality of terminals B1 to the first scanning line driving circuit and a type of the display control signal supplied from the plurality of terminals B2 to the second scanning driving circuit are different on the basis of data set in a register on the inside of the semiconductor chip.

8. The liquid crystal display device according to claim 6, further comprising a first counter electrode selecting circuit and a second counter electrode selecting circuit arranged on both sides of the display area, which is configured by the plurality of pixels, and configured to select the counter electrodes of the divided blocks, wherein

the first counter electrode selecting circuit and the second counter electrode selecting circuit are circuits incorporated in the inside of the liquid crystal display panel, and

the plurality of terminals B1 and the plurality of terminals B2 also include terminals for supplying an address signal to the first counter electrode selecting circuit and the second counter electrode selecting circuit.

10. A liquid crystal display device comprising:

a first substrate;

a second substrate including a detection electrode of a touch panel;

liquid crystal held between the first substrate and the second substrate;

pixel electrodes and counter electrodes configured to control orientation of the liquid crystal in each of a plurality of pixels arranged in a matrix shape; and

a semiconductor chip configured to supply a counter voltage and a touch panel scanning voltage to the counter electrodes of the divided blocks, wherein

the counter electrodes are divided into a plurality of blocks, common to the pixels on a plurality of display lines being side by side, and used as scanning electrodes of the touch panel as well,

the semiconductor chip includes a second terminal group formed on a side on an opposite side of a display area configured by the plurality of pixels,

a plurality of terminals arranged in a center of the semiconductor chip in the second terminal group are terminals D to which an input signal group from an outside is input,

a plurality of terminals arranged at one end of the semiconductor chip in the second terminal group are terminals B1 for supplying the display control signal to the first scanning line driving circuit and a plurality of terminals arranged at the other end of the semiconductor chip in the second terminal group are terminals B2 for supplying the display control signal to the second scanning line driving circuit, and

terminals C arranged between the terminals D and the terminals B1 and terminals C2 arranged between the terminals D and the terminals B2 are terminals to which a detection voltage from the detection electrode is input.

11. The liquid crystal display device according to claim 10, wherein only either the terminals C1 or the terminals C2 are used.