Liquid crystal display device with touch panel

• US 9,459,482 B2
• Filed: 06/25/2014
• Issued: 10/04/2016
• Est. Priority Date: 06/25/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Abe, Hiroyuki, Sato, Hideo, Suzuki, Takayuki
• Primary Examiner(s): Spar, Ilana
• Assistant Examiner(s): RAYAN, MIHIR K
• Application Number:
  US14/314,345
• Publication Number:
  US 20140375606A1
• Time in Patent Office: 832 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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

A liquid crystal display device with a touch panel includes: display drive circuits that are disposed respectively at the outsides of the sides opposing to a display region, and that apply sequential scanning signal potentials to scanning signal lines; touch panel drive circuits that are disposed respectively further to the outsides of the display drive circuits, and that apply sequential drive pulses to a plurality of drive electrodes among common electrodes; and switching circuits that are disposed respectively at insides of the display drive circuits, and that switch between applying common electric potentials for controlling the alignment of the liquid crystal composition and applying a touch drive pulse that detects the touching to the display surface.

Claims

1. A liquid crystal display device with a touch panel comprising:

a first substrate;

a second substrate opposing to the first substrate, and forming an overlapped area with the first substrate;

a liquid crystal composition sandwiched between the first substrate and second substrate;

a display region formed in the overlapped area;

a frame region formed in the overlapped area and outside of the display region;

a plurality of pixels arranged in a matrix shape for forming the display region, the pixel including a pixel transistor and a pixel electrode electrically connected to the pixel transistor;

a plurality of scanning signal lines extended in a first direction, the scanning signal line being connected in common to gates of the pixel transistors of the pixels arranged in the first direction;

a plurality of common electrodes extended in the first direction, the plurality of common electrodes being applied a common voltage so as to control an alignment of the liquid crystal composition by forming an electric field in combination with the pixel electrode;

a plurality of detection electrodes extended in a second direction intersecting with the first direction;

a drive integrated circuit disposed outside of the overlapped area and along the first direction, and outputting a first selection signal;

a display drive circuit disposed in the frame region and along the second direction, and applying sequential scanning signal potentials to the scanning signal lines;

a touch panel drive circuit disposed in the frame region and further than the display drive circuit from a standpoint of the display region, and outputting second selection signals corresponding with the common electrodes respectively;

a switching circuit disposed in the frame region and between the display drive circuit and the display region, and electrically connecting to the plurality of common electrodes;

a touch panel pulse signal line connecting to the switching circuit, and supplying a touch panel pulse signal; and

a common voltage line connecting to the switching circuit, and supplying a common voltage,

wherein the switching circuit selects the common electrode on the basis of the second selection signal and switches a connection to the selected common electrode between the touch panel pulse signal line and the common voltage line by the first selection signal, and

wherein the display drive circuit is sandwiched between the switching circuit and the touch panel drive circuit.

2. The liquid crystal display device with a touch panel according to claim 1,

wherein the touch panel drive circuit and the display drive circuit are configured with only single channel transistors of any of n channel or p channel.

3. The liquid crystal display device with a touch panel according to claim 1,

wherein the touch panel drive circuit operates using a two-phase clock.

4. The liquid crystal display device with a touch panel according to claim 1,

wherein the display region is sandwiched between two frame regions,

each frame region of the two frame regions has the display drive circuit,

one of the display drive circuits disposed in one of the frame regions applies the scanning signal potential only to even-numbered scanning signal lines among the scanning signal lines and the other display drive circuit applies the scanning signal potential only to odd-numbered scanning signal lines among the scanning signal lines.

5. A liquid crystal display device with a touch panel comprising:

a rectangular display region on which an image is displayed, and has a first side and a second side adjacent to the first side;

a drive IC disposition region where a drive IC is disposed at an outside of the first side of the rectangular display region;

a plurality of scanning signal lines disposed in the rectangular display region and extended in a first direction;

a plurality of common electrodes disposed at the rectangular display region and extended in the first direction;

a display drive circuit disposed at an outside of the second side and along a second direction intersecting with the first direction, and connecting to the plurality of scanning signal lines;

a touch panel drive circuit disposed further than the display drive circuit from a standpoint of the rectangular display region and along the second direction, and connecting to selecting signal lines;

a switching circuit disposed between the display drive circuit and the second side of the rectangular display region, and connecting to the common electrodes,

a first clock signal line connecting between the touch panel drive circuit and the driving IC,

a second clock signal line connecting between the display drive circuit and the driving IC, and

a switching signal line connecting between the switching circuit and the driving IC,

wherein the switching signal line, the second clock signal line and the first clock signal line are arranged in this order in the first direction at the drive IC disposition region, and

wherein the display drive circuit is sandwiched between the switching circuit and the touch panel drive circuit.

6. The liquid crystal display device with a touch panel according to claim 5,

wherein the touch panel drive circuit and the display drive circuit are configured with only single channel transistors of any of n channel or p channel.

7. The liquid crystal display device with a touch panel according to claim 5,

wherein the touch panel drive circuit operates using a two-phase clock.

8. The liquid crystal display device with a touch panel according to claim 5, further comprise another display drive circuit disposed at an outside of a third side opposed to the second side,

wherein, the display drive circuit disposed at the outside of the second side applies a scanning signal potential only to even-numbered scanning signal lines among the scanning signal lines, and

the display drive circuit disposed at the outside of the third side applies a scanning signal potential only to odd-numbered scanning signal lines among the scanning signal lines.