Display device and method of driving the same for alternately applying a reset voltage to row and column sensor data lines

• US 8,896,572 B2
• Filed: 06/24/2013
• Issued: 11/25/2014
• Est. Priority Date: 12/26/2007
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Joo-Hyung, Uh, Kee-Han, Cho, Man-Seung
• Primary Examiner(s): Cheng, Joe H
• Assistant Examiner(s): CRAWLEY, KEITH L
• Application Number:
  US13/925,153
• Publication Number:
  US 20130278559A1
• Time in Patent Office: 519 Days
• Field of Search: 345173-178, 341/5, 341/20, 341/33, 323/904
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• 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 3/0445 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

Abstract

In a touch sensible display device, a first sensing unit is connected to a row sensor data line and outputs a first sensing signal according to a touch, and a second sensing unit is connected to a column sensor data line and outputs a second sensing signal according to the touch. A sensing signal processor alternately applies a reset voltage to the row sensor data line and the column sensor data line and generates a sensing data signal according to the first sensing signal and the second sensing signal, and a touch determiner processes a sensing data signal to generate touch information.

Claims

1. A display device, comprising:

a first sensor data line extending in a row direction and configured to transmit a first sensing signal, according to a touch to a first output unit, via a first sensing switching element;

a second sensor data line extending in a column direction and configured to transmit a second sensing signal, according to a touch to a second output unit, via a second sensing switching element;

a first reset switching element connected between the first sensor data line and a reset voltage;

a second reset switching element connected between the second sensor data line and the reset voltage,

wherein the first sensing switching element and the second reset switching element are simultaneously turned on during a first period, and

wherein the second sensing switching element and the first reset switching element are simultaneously turned on during a second period,

wherein the first output unit comprises;

a first amplifier including a first inversion terminal and a first output terminal;

a first capacitor connected between the first inversion terminal and the first output terminal of the first amplifier; and

a third reset switching element connected in parallel to the first capacitor, and

wherein the second output unit comprises;

a second amplifier including a second inversion terminal and a second output terminal;

a second capacitor connected between the second inversion terminal and the second output terminal of the second amplifier; and

a fourth reset switching element connected in parallel to the second capacitor,

wherein the first sensor switching element and the third reset switching element are simultaneously turned off during a third period between the first period and the second period, and the first output voltage is processed during the third period, and

wherein the second sensor switching element and the fourth reset switching element are simultaneously turned off during a fourth period between the second period and the first period, and the second output voltage is processed during the fourth period.

2. The display device of claim 1, further comprising:

a reference capacitor disposed between the first sensor data line and the second sensor data line;

a first variable capacitor connected to a first terminal of the reference capacitor in series and having a variable capacitance according to the touch; and

a second variable capacitor connected to a second terminal of the reference capacitor in series and having a variable capacitance according to the touch.

3. The display device of claim 2, wherein,

the first output unit generates a first output voltage by integrating the first sensing signal during the first period, and

the second output unit generates a second output voltage by integrating the second sensing signal during the second period.

4. The display device of claim 3, wherein,

the third reset switching element is turned on during the second period to initialize the first output terminal to a reference voltage, and

the fourth reset switching element is turned on during the first period to initialize the second output terminal to the reference voltage.

5. The display device of claim 1, wherein,

the first output unit generates a first output voltage by integrating the first sensing signal during the first period, and

the second output unit generates a second output voltage by integrating the second sensing signal during the second period.

6. The display device of claim 1, wherein,

the third reset switching element is turned on during the second period to initialize the first output terminal to a reference voltage, and

the fourth reset switching element is turned on during the first period to initialize the second output terminal to the reference voltage.