Display device with input system and method for driving the same

Patent metadata

Field	Value
Publication number	US-9329718-B2
Application number	US-201213728047-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Jun 29, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A display device with an input system and a method of driving the same are provided. The method for driving a display device with an input system includes: receiving touch information, including electromagnetic touch information or capacitive touch information, by alternately performing electromagnetic touch sensing and capacitive touch sensing, if the touch information is the electromagnetic touch information: performing the electromagnetic touch sensing for a first period, and performing the capacitive touch sensing after the first period, and if the touch information is the capacitive touch information, performing the capacitive touch sensing for the first period.

First claim

What is claimed is:

1. A method for driving a display device with an input system, comprising:
in an idle mode, receiving touch information, comprising electromagnetic touch information or capacitive touch information, by alternately performing an electromagnetic touch sensing and capacitive touch sensing, the electromagnetic touch sensing and capacitive touch sensing being performed at different times;
if the received touch information is the electromagnetic touch information, entering an electromagnetic touch sensing mode comprising:
performing a plurality of electromagnetic touch sensings for a first period; and
performing the capacitive touch sensing in a second period after the first period;

if the received touch information is the capacitive touch information, entering a capacitive touch sensing mode comprising:
performing a plurality of capacitive touch sensings for the first period; and
performing the electromagnetic touch sensing in a second period after the first period; and

returning to the idle mode after the second period.

2. The method of claim 1 , further comprising:
alternately performing the capacitive touch sensing and electromagnetic touch sensing in the idle mode if:
the touch information is not the capacitive touch information; and
the touch information received for the second period after the first period is not the electromagnetic touch information; and

performing the electromagnetic touch sensing for a predetermined period after the second period if the touch information inputted for the second period is the electromagnetic touch information.

3. The method of claim 1 , further comprising:
if the touch information is the capacitive touch information, performing the capacitive touch sensing for the first period, and performing the electromagnetic touch sensing in the second period after the first period; and
based on the electromagnetic touch sensing, if the touch information is the electromagnetic touch information, performing the electromagnetic touch sensing for the first period.

4. The method of claim 3 , further comprising:
alternately performing the capacitive touch sensing and electromagnetic touch sensing if the touch information is not the electromagnetic touch information based on the electromagnetic touch sensing, and the touch information inputted for the second period is not the capacitive touch information; and
performing the capacitive touch sensing for a predetermined period after the second period if the touch information inputted for the second period is the capacitive touch information.

5. The method of claim 1 , wherein, in alternately performing the capacitive touch sensing and electromagnetic touch sensing, there is a switching blank when the capacitive touch sensing is changed into the electromagnetic touch sensing or the electromagnetic touch sensing is changed into the capacitive touch sensing.

6. The method of claim 1 , wherein:
performing the electromagnetic touch sensing for the first period is performed by a plurality of electromagnetic touch sensing signals which are divided; and
there is an interstitial blank between each of the electromagnetic touch sensing signals which are divided.

7. The method of claim 1 , wherein:
performing the capacitive touch sensing for the first period is performed by a plurality of capacitive touch sensing signals which are divided; and
there is an interstitial blank between each of the capacitive touch sensing signals which are divided.

8. A display device with an input system, comprising:
an idle sensor configured to, in an idle mode, alternately perform an electromagnetic touch sensing and a capacitive touch sensing, the electromagnetic touch sensing and capacitive touch sensing being performed at different times;
a touch information determiner configured to determine that touch information received from the idle sensor corresponds to electromagnetic touch information or capacitive touch information;
an electromagnetic touch sensor configured to, if the received touch information is the electromagnetic touch information, enter an electromagnetic touch sensing mode comprising:
performing a plurality of electromagnetic touch sensings for a first period; and
performing the capacitive touch sensing in a second period after the first period;

a capacitive touch sensor configured to, if the received touch information is the capacitive touch information, entering a capacitive touch sensing mode comprising:
performing a plurality of capacitive touch sensings for the first period, if the touch information is the capacitive touch information; and
performing the electromagnetic touch sensing in a second period after the first period,

wherein, after the second period, the idle sensor is further configured to return to the idle mode.

9. The display device of claim 8 , wherein:
the idle sensor is further configured to alternately perform the capacitive touch sensing and electromagnetic touch sensing in the idle mode if the touch information is not the capacitive touch information based on the capacitive touch sensing; and
the touch information received for the second period is not the electromagnetic touch information.

10. The display device of claim 8 , wherein:
the electromagnetic touch sensor is further configured to perform the electromagnetic touch sensing for the first period if the touch information is not the capacitive touch information based on the capacitive touch sensing; and
the touch information received for the second period is the electromagnetic touch information.

11. The display device of claim 8 , wherein:
the capacitive touch sensor is further configured to perform the capacitive touch sensing for the first period if the touch information is the capacitive touch information; and
the electromagnetic touch sensor is further configured to perform the electromagnetic touch sensing for the first period, if the touch information is the electromagnetic touch information, based on the electromagnetic touch sensing, through the electromagnetic touch sensing in the second period after the first period.

12. The display device of claim 11 , wherein:
the idle sensor is further configured to alternately perform the capacitive touch sensing and electromagnetic touch sensing if the touch information is not the electromagnetic touch information based on the electromagnetic touch sensing; and
the touch information inputted for the second period is not the capacitive touch information.

13. The display device of claim 11 , wherein:
the capacitive touch sensor is further configured to perform the capacitive touch sensing for the first period if the touch information is not the electromagnetic touch information based on the electromagnetic touch sensing; and
the touch information inputted for the second period is the capacitive touch information.

14. A method for a display device performing capacitive and electromagnetic touch sensing, the method comprising:
in an idle operation, alternating between capacitive touch sensing and electromagnetic touch sensing to determine whether touch information is received, the received touch information corresponding to capacitive touch information after capacitive touch sensing or electromagnetic touch information after electromagnetic touch sensing;
in response to touch information being received, determining whether the received touch information corresponds to the capacitive touch information or electromagnetic touch information;
if the input touch information is the electromagnetic touch information, performing an electromagnetic touch sensing operation, comprisin

Assignees

• Lg Display Co Ltd

Inventors

• Kim Kyounghwan

Classifications

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/046

  by electromagnetic means · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/04166 Primary

  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 title