DISPLAY DEVICE WITH TOUCH SENSOR, POTENTIAL CONTROL METHOD AND PROGRAM

• US 20130127752A1
• Filed: 11/13/2012
• Published: 05/23/2013
• Est. Priority Date: 11/22/2011
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Takeuchi, Takeya, Mizuhashi, Hiroshi, Katsuta, Tadayoshi, Shima, Takehiro
• Granted Patent: US 9,207,481 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display device with a touch sensor includes: plural display pixel electrodes; a common electrode arranged opposite to the display pixel electrodes; a display function layer having an image display function; a display control circuit performing image display control so as to fulfill the display function of the display function layer by applying a voltage for display between the display pixel electrodes and the common electrode based on an image signal; and a touch detection electrode provided opposite to the common electrode and forming capacitance between the touch detection electrode and the common electrode, wherein a drive voltage for display applied to the common electrode by the display control circuit is used as a drive signal for the touch sensor, and a gate potential of TFT circuits included in the display pixel electrodes is increased during a period when the drive signal for the touch sensor is applied.

Claims

1. A display device with a touch sensor comprising:

plural display pixel electrodes;

a common electrode arranged opposite to the display pixel electrodes;

a display function layer having an image display function;

a display control circuit performing image display control so as to fulfill the display function of the display function layer by applying a voltage for display between the display pixel electrodes and the common electrode based on an image signal; and

a touch detection electrode provided opposite to the common electrode and forming capacitance between the touch detection electrode and the common electrode,

wherein a drive voltage for display applied to the common electrode by the display control circuit is used as a drive signal for the touch sensor, and

a gate potential of TFT circuits included in the display pixel electrodes is increased during a period when the drive signal for the touch sensor is applied.

2. The display device with the touch sensor according to claim 1,

wherein the gate potential is in a high state during a vertical blanking period and a horizontal blanking period.

3. The display device with the touch sensor according to claim 2,

wherein the gate potential becomes in the high state in synchronized with the drive signal for the touch sensor.

4. The display device with the touch sensor according to claim 1,

wherein the gate potential becomes in a high state when writing in a positive polarity display voltage is performed.

5. A potential control method of a display device with a touch sensor including

plural display pixel electrodes,

a common electrode arranged opposite to the display pixel electrodes,

a display function layer having an image display function,

a display control circuit performing image display control so as to fulfill the display function of the display function layer by applying a voltage for display between the display pixel electrodes and the common electrode based on an image signal, and

a touch detection electrode provided opposite to the common electrode and forming capacitance between the touch detection electrode and the common electrode, the method comprising:

using a drive voltage for display applied to the common electrode by the display control circuit as a drive signal for the touch sensor; and

increasing a gate potential of TFT circuits included in the display pixel electrodes is increased during a period when the drive signal for the touch sensor is applied.

6. A program for by a computer controlling a display device with a touch sensor including plural display pixel electrodes,

a common electrode arranged opposite to the display pixel electrodes,

a display function layer having an image display function,

a display control circuit performing image display control so as to fulfill the

display function of the display function layer by applying a voltage for display between the display pixel electrodes and the common electrode based on an image signal, and

a touch detection electrode provided opposite to the common electrode and forming capacitance between the touch detection electrode and the common electrode, the program allowing the computer to execute processing of

using a drive voltage for display applied to the common electrode by the display control circuit as a drive signal for the touch sensor, and

increasing a gate potential of TFT circuits included in the display pixel electrodes is increased during a period when the drive signal for the touch sensor is applied.

7. A display device with a touch sensor comprising:

plural display pixel electrodes;

a common electrode arranged opposite to the display pixel electrodes;

a display function layer having an image display function;

a display control circuit performing image display control so as to fulfill the display function of the display function layer by applying a voltage for display between the display pixel electrodes and the common electrode based on an image signal; and

a touch detection electrode provided opposite to the common electrode and forming capacitance between the touch detection electrode and the common electrode,

wherein a drive voltage for display applied to the common electrode by the display control circuit is used as a drive signal for the touch sensor, and

a signal supplied to gates of TFT circuits included in the display pixel electrodes is a signal in which different three potentials are switched at given timings.

8. The display device with the touch sensor according to claim 7,

wherein the three potentials includes a first potential to be a reference, a second potential for turning on the TFT circuits and a third potential at the time of supplying the drive signal for the touch sensor.

9. The display device with the touch sensor according to claim 8,

wherein a potential of the signal supplied to gates of the TFT circuits in a vertical blanking period and in a horizontal blanking period is the third potential.

10. The display device with the touch sensor according to claim 7,

wherein the signal supplied to gates of the TFT circuits is a signal synchronized with the drive signal for the touch sensor, in which the first potential and the third potential are repeated.

11. The display device with the touch sensor according to claim 7,

wherein the signal supplied to gates of the TFT circuits is a signal in which different three potentials are switched at given timings when writing in a positive polarity display voltage is performed, and is a signal in which two potentials of the different three potentials are switched at given timings when writing in a negative polarity display voltage is performed.

12. A potential control method of a display device with a touch sensor including

plural display pixel electrodes,

a common electrode arranged opposite to the display pixel electrodes,

a display function layer having an image display function,

a display control circuit performing image display control so as to fulfill the display function of the display function layer by applying a voltage for display between the display pixel electrodes and the common electrode based on an image signal, and

a touch detection electrode provided opposite to the common electrode and forming capacitance between the touch detection electrode and the common electrode, the method comprising:

using a drive voltage for display applied to the common electrode by the display control circuit as a drive signal for the touch sensor; and

allowing a signal supplied to gates of TFT circuits included in the display pixel electrodes to be a signal in which different three potentials are switched at given timings.

13. A program for a computer controlling a display device with a touch sensor including

plural display pixel electrodes,

a common electrode arranged opposite to the display pixel electrodes,

a display function layer having an image display function,

a display control circuit performing image display control so as to fulfill the display function of the display function layer by applying a voltage for display between the display pixel electrodes and the common electrode based on an image signal, and

a touch detection electrode provided opposite to the common electrode and forming capacitance between the touch detection electrode and the common electrode, the program allowing the computer to execute processing of

using a drive voltage for display applied to the common electrode by the display control circuit as a drive signal for the touch sensor, and

allowing a signal supplied to gates of TFT circuits included in the display pixel electrodes to be a signal in which different three potentials are switched at given timings.