Touchscreen, Driving Method Thereof, and Touchscreen Module

• US 20130257798A1
• Filed: 03/12/2013
• Published: 10/03/2013
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tamura, Hikaru, Kurokawa, Yoshiyuki, Hamada, Toshiki, Imada, Jiro
• Granted Patent: US 9,898,133 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Malfunction of a large-sized touchscreen is prevented. In particular, malfunction of a large-sized touchscreen is prevented by reduction of wiring delay between a detection region and a controller. In a touchscreen, in which a detection area is divided, including a plurality of detection regions and a plurality of sensors, controllers are provided for the respective divided detection regions, and all the controllers are electrically connected to one central control device. It is preferable that a wiring between each of the divided detection regions and the corresponding controller be shorter than a wiring between the controller and the central control device.

Claims

1. A touchscreen comprising:

a plurality of detection regions;

a plurality of controllers; and

a central control device,

wherein each of the plurality of controllers is electrically connected to corresponding one of the plurality of detection regions, and

wherein the plurality of controllers are electrically connected to the central control device.

2. The touchscreen according to claim 1, wherein a wiring between each of the plurality of detection regions and corresponding one of the plurality of controllers is shorter than a wiring between the corresponding one of the plurality of controllers and the central control device.

3. The touchscreen according to claim 1,

wherein the touchscreen includes a plurality of sensors in the plurality of detection regions, and

wherein the touchscreen is a capacitive touchscreen in which a capacitor is provided for each of the plurality of sensors.

4. The touchscreen according to claim 1, wherein the number of the controllers is 4.

5. A display device comprising the touchscreen according to claim 1.

6. A touchscreen comprising:

a plurality of detection regions;

a plurality of controllers; and

a central control device,

wherein each of the plurality of detection regions comprises;

a first substrate;

a switching element over the first substrate;

a pixel electrode over the first substrate; and

a sensor portion over the first substrate,

wherein each of the plurality of controllers is electrically connected to corresponding one of the plurality of detection regions, and

wherein the plurality of controllers are electrically connected to the central control device.

7. The touchscreen according to claim 6, wherein a wiring between each of the plurality of detection regions and corresponding one of the plurality of controllers is shorter than a wiring between the corresponding one of the plurality of controllers and the central control device.

8. The touchscreen according to claim 6, wherein the touchscreen is a capacitive touchscreen in which a capacitor is provided for the sensor portion.

9. The touchscreen according to claim 6, further comprising a second substrate between the first substrate and the sensor portion.

10. The touchscreen according to claim 6, further comprising a second substrate over the sensor portion.

11. The touchscreen according to claim 6, further comprising a black matrix over the first substrate.

12. The touchscreen according to claim 6, wherein the number of the controllers is 4.

13. A display device comprising the touchscreen according to claim 6.

14. A method for driving a touchscreen, the touchscreen comprising:

a plurality of detection regions;

a plurality of controllers; and

a central control device,

wherein each of the plurality of controllers is electrically connected to corresponding one of the plurality of detection regions,

wherein the plurality of controllers are electrically connected to the central control device,

the method comprising the steps of;

starting up the touchscreen;

sending a first command which is a startup command to the plurality of controllers until all the plurality of controllers respond;

initializing all the plurality of controllers in the case where all the plurality of controllers respond;

sending a second command to start detection of touch operation to the plurality of controllers;

in the case where touch operation is detected, obtaining identification data of the controller corresponding to a touch position and coordinate data of the corresponding detection region;

determining the touch position on the entire touchscreen by using the identification data and the coordinate data; and

in the case where the identification data and the coordinate data are obtained or in the case where touch operation is not detected, resending the second command.