Touch panel equipped display device and driving method for the same

• US 9,342,183 B2
• Filed: 02/23/2012
• Issued: 05/17/2016
• Est. Priority Date: 03/01/2011
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Sugita, Yasuhiro, Yamagishi, Shinji, Kida, Kazutoshi
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Rodriguez, Joseph G
• Application Number:
  US14/001,544
• Publication Number:
  US 20130335374A1
• Time in Patent Office: 1,545 Days
• Field of Search: 345/173
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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 3/044 by capacitive means
• 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 touch panel includes a plurality of drive lines and a plurality of sense lines, a sampling switch connected to the sense lines, and an integral circuit connected to the sense lines through the sampling switch. The sampling switch is arranged to keep an on- or off-state for a certain time from a moment at which a voltage of a source bus line is changed.

Claims

1. A touch panel equipped display device comprising:

a display panel and a capacitance-type touch panel arranged on an observer-facing surface of the display panel or disposed in the display panel,

the display panel including;

a plurality of data signal lines and a plurality of scan signal lines, which are arranged to extend perpendicularly or substantially perpendicularly to each other; and

a data signal line driving circuit arranged to successively supply a voltage to the plurality of data signal lines one by one,

the touch panel including;

a plurality of transmission electrodes and a plurality of reception electrodes, which are arranged to extend perpendicularly or substantially perpendicularly to each other;

an integral circuit;

a switching element arranged to connect any one of the plurality of reception electrodes to the integral circuit; and

a controller arranged and programmed to change over on- and off-states of the switching element at least one or more times during a period in which the voltage is supplied to the plurality of data signal lines;

wherein

the controller is arranged and programmed to keep the on- or off-state of the switching element for a certain time from a moment at which the data signal line driving circuit changes the voltage;

the controller is further arranged and programmed to change the on- and off-state of the switching element more than once during one horizontal scan period; and

the display panel further includes an SSD switch and the controller is arranged and programmed to change the on- and off-state of the switching element more than once during a period within the one horizontal scan period, the period within the one horizontal scan period corresponding to a time during which the SSD switch is connected to one of the plurality of data signal lines which corresponds to a particular one of different colors of the display device.

2. The touch panel equipped display device according to claim 1, wherein the certain time is previously set depending on a period during which radiation noise is generated from the display panel.

3. The touch panel equipped display device according to claim 1, wherein the certain time is about 2 s to about 4 s.

4. The touch panel equipped display device according to claim 1, wherein

the display panel further includes a generating device arranged to generate a synchronizing signal;

and

the touch panel is operated in accordance with the synchronizing signal.

5. The touch panel equipped display device according to claim 1, wherein the touch panel is a touch panel of mutual capacitance-type.

6. The touch panel equipped display device according to claim 1, further comprising a voltage applying device arranged to apply a DC voltage to an opposed electrode of the display panel.

7. A driving method for a touch panel equipped display device including a display panel and a capacitance-type touch panel arranged on an observer-facing surface of the display panel or disposed in the display panel,

the display panel including:

a plurality of data signal lines and a plurality of scan signal lines, which are arranged to extend perpendicularly or substantially perpendicularly to each other; and

a data signal line driving circuit arranged to successively supply a voltage to the plural data signal lines one by one,

the touch panel including;

a plurality of transmission electrodes and a plurality of reception electrodes, which are arranged to extend perpendicularly or substantially perpendicularly to each other;

an integral circuit;

a switching element arranged to connect any one of the plural reception electrodes to the integral circuit; and

a controller arranged and programmed to change over on- and off-states of the switching element at least one or more times during a period in which the voltage is supplied to the plural data signal lines;

wherein

the controller is arranged and programmed to keep the on- or off-state of the switching element for a certain time from a moment at which the data signal line driving circuit changes the voltage;

the controller is further arranged and programmed to change the on- and off-state of the switching element more than once during one horizontal scan period; and

the display panel further includes an SSD switch and the controller is arranged and programmed to change the on- and off-state of the switching element more than once during a period within the one horizontal scan period, the period within the one horizontal scan period corresponding to a time during which the SSD switch is connected to one of the plurality of data signal lines which corresponds to a particular one of different colors of the display device.