Display device and method of driving the same

• US 10,133,384 B2
• Filed: 10/28/2016
• Issued: 11/20/2018
• Est. Priority Date: 06/09/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Pak, Sang-Jin, Cho, Man-Seung, Uh, Kee-Han, Lee, Joo-Hyung
• Primary Examiner(s): MARINELLI, PATRICK
• Application Number:
  US15/337,893
• Publication Number:
  US 20170045975A1
• Time in Patent Office: 753 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• 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: 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 3/0443 using a single layer of sensing electrodes
• 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 2310/061 for resetting or blanking
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display device includes a display panel, a source driving part, a gate driving part, a readout part and a pulse generating part. The display panel includes an array substrate on which a source line and a gate line are formed, and an opposite substrate on which a common electrode is formed. The readout part is electrically connected with at least one of the lines of the array substrate and the common electrode of the opposite substrate, and reads out a detection signal during an elimination period of a frame period. The pulse generating part outputs a control pulse for driving the readout part during the elimination period. Accordingly, a detection signal is read out through lines or a common electrode that are/is formed for displaying an image, so that an aperture ratio may be increased, and a manufacturing process thereof may be simplified.

Claims

1. A display device comprising:

a display panel comprising an array substrate and an opposite substrate;

the array substrate including a detecting element to detect a touch position and having a source line and a gate line formed thereon,

the opposite substrate having a common electrode formed thereon;

a source driving part outputting a data signal to the source line during a display period of a frame period;

a gate driving part outputting a gate signal to the gate line during the display period;

a readout part reading out one or more detection signals during an elimination period of the frame period, the readout part being electrically connected with at least one of the lines of the array substrate and the common electrode of the opposite substrate, wherein the elimination period is separate from the display period;

a pulse generating part outputting a control pulse for operating the readout part during the elimination period;

and

a voltage generator that provides a constant voltage value to the common electrode during the elimination period, and provides a swing voltage to the common electrode during the display period.

2. The display device of claim 1, wherein the readout part comprises:

a first readout part reading out a first detection signal from the source line, the first readout part being connected to a terminal of the source line; and

a second readout part reading out a second detection signal from the gate line, the second readout part being connected to a terminal of the gate line.

3. The display device of claim 2, wherein light is incident onto the opposite substrate of the display panel, and an upper surface of the array substrate is adapted to be touched by an object.

4. The display device of claim 3, further comprising a control part that provides a control signal to the voltage generator to apply a direct current voltage having the constant voltage value to the common electrode during the elimination period.

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

a sampling part that receives the one or more detection signals from the readout part and generates a sample signal to determine coordinates of positions of a display area touched by an object.

5. A method of driving a display device including an array substrate on which a source line and a gate line are formed and an opposite substrate on which a common electrode is formed, comprising:

displaying an image at the display device by outputting driving signals to the source line and the gate line during a display period of a frame period; and

reading out one or more detection signals detected at the display device from at least one of the lines of the array substrate and the common electrode of the opposite substrate during an elimination period of the frame period, wherein the elimination period is separate from the display period,

sampling coordinates of positions of the array substrate touched by an object in response to reading out the one or more detection signals during the elimination period,

wherein a constant voltage value is provided to the common electrode during the elimination period, and

wherein a swing voltage is provided to the common electrode during the display period.

6. The method of claim 5, wherein reading out the one or more detection signals comprises reading out a first detection signal from the source line and reading out a second detection signal from the gate line.

7. The method of claim 6, wherein reading out the one or more detection signals further comprises applying a direct current voltage to the common electrode to maintain a constant voltage of a parasitic capacitor formed between the common electrode and the source line during the elimination period when light is incident onto a bottom surface of the opposite substrate.

9. The method of claim 5, wherein the sampling coordinates of positions of the array substrate touched by an object includes generating a sample signal in response to reading out the one or more detection signals.

10. A display device comprising:

a display panel comprising an array substrate including a detecting element to detect contact with an object and having at least a source line and a gate line formed thereon;

an opposite substrate having a common electrode formed thereon;

a source driving circuit that outputs a data signal to the source line during a display period of a frame period;

a gate driving circuit that outputs a gate signal to the gate line during the display period;

a memory having digital data stored therein;

a control circuit configured to read the digital data stored in the memory and provide the digital data to the source driving circuit;

a pulse generator that outputs a control pulse in response to receiving a control signal from the control circuit; and

a readout part electrically connected with at least one of the lines of the array substrate and the common electrode of the opposite substrate, the readout part reads out one or more detection signals in response to receiving the control pulse from the pulse generator,

wherein the control circuit controls a voltage output to the common electrode at a constant value during an elimination period of the frame period that is separate from the display period, and controls a swing voltage that is output to the common electrode during the display period.