LIQUID CRYSTAL DISPLAY DEVICE WITH TOUCH PANEL

• US 20140375606A1
• Filed: 06/25/2014
• Published: 12/25/2014
• 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
• Granted Patent: US 9,459,482 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 plurality of scanning signal lines that are extended and apposed so as to be commonly connected to a gate of each pixel transistor of pixels arranged in one direction, in a display region where the pixels are arranged in a matrix shape;

common electrodes that are a plurality of electrodes extended so as to horizontally cross the display region in the one direction, and that control an alignment of liquid crystal composition by forming an electric field in combination with pixel electrodes connected to the pixel transistors;

detection electrodes that are a plurality of electrodes extended so as to horizontally cross the display region in a different direction from the one direction, and that detect a contact position on a panel;

display drive circuits that are disposed respectively at the outsides of the sides opposing the one direction of the display region, and that apply sequential scanning signal potentials to the scanning signal lines;

touch panel drive circuits that are disposed respectively at further outsides of the display drive circuits and at the outsides of the sides opposing to the one direction of the display region, and that apply sequential drive pulses to a plurality of drive electrodes among the common electrodes; and

switching circuits that are disposed respectively at insides of the display drive circuits and at the outsides of the sides opposing the one direction of the display region, and that switch between applying a common electric potential for controlling the alignment of the liquid crystal composition with respect to the plurality of drive electrodes and applying a touch drive pulse that detects the touching to the display surface.

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, in the display drive circuit, one of the display drive circuits disposed at the outside of each sides applies a scanning signal potential only to the even-numbered scanning signal lines among the scanning signal lines and the other display drive circuit applies a scanning signal potential only to the 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

a drive IC disposition region where a drive IC is disposed at the outside of one side of the rectangular display region,

wherein wirings extended to the outside of the display region from the drive IC so as not to cross the one side are arranged in line in an order of far side from the display region, which are a clock signal line for driving the touch panel, a clock signal line for driving a display panel, and a switching signal line for selecting which to apply a touch panel drive signal or a display panel drive signal.