TOUCH DEVICE AND TOUCH POSITION LOCATING METHOD THEREOF

• US 20120127120A1
• Filed: 02/18/2011
• Published: 05/24/2012
• Est. Priority Date: 11/22/2010
• Status: Abandoned Application

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Chang, Yaw-Guang, MIAO, YUNG-KUANG
• Application Number:
  US13/030,473
• Publication Number:
  US 20120127120A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 3/044 by capacitive means
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch device and a touch position locating method thereof are provided. The touch position locating method includes the following steps. A plurality of target blocks are selected from a plurality of sensing blocks of a touch panel. The target blocks are detected at the same time to obtain a plurality of touch sensing data. Reference data is obtained according to the touch sensing data. Subtraction operations between the reference data and the touch sensing data are performed respectively, so as to obtain a plurality of adjusted touch sensing data. A location of a touch point on the touch panel is calculated according to the adjusted touch sensing data.

Claims

1. A touch device, comprising:

a touch panel, having a plurality of sensing blocks;

a touch detecting module, coupled to the touch panel, for selecting a plurality of target blocks from the sensing blocks, and detecting the target blocks at the same time to obtain a plurality of touch sensing data; and

a processing module, coupled to the touch detecting module, for performing subtraction operations between the touch sensing data and a reference data to obtain a plurality of adjusted touch sensing data, and calculating a location of a touch point on the touch panel according to the adjusted touch sensing data, wherein the reference data is obtained according to the touch sensing data.

2. The touch device as claimed in claim 1, wherein the reference data is a touch sensing data having a minimum value in the plurality of touch sensing data of the target blocks.

3. The touch device as claimed in claim 1, wherein the reference data is an average of a part of or all of the plurality of touch sensing data of the target blocks.

4. The touch device as claimed in claim 1, wherein the touch panel is a capacitive touch panel or a resistive touch panel.

5. The touch device as claimed in claim 1, wherein the touch sensing data are current signals or voltage signals.

6. A touch position locating method of a touch device, wherein the touch device comprises a touch panel having a plurality of sensing blocks, the touch position locating method comprising:

selecting a plurality of target blocks from the sensing blocks;

detecting the target blocks at the same time to obtain a plurality of touch sensing data;

obtaining reference data according to the touch sensing data;

performing subtraction operations between the touch sensing data and the reference data to obtain a plurality of adjusted touch sensing data; and

calculating a location of a touch point on the touch panel according to the adjusted touch sensing data.

7. The touch position locating method as claimed in claim 6, wherein the step of obtaining the reference data according to the touch sensing data comprises:

comparing the plurality of touch sensing data to obtain a minimum value from the plurality of touch sensing data; and

taking the minimum value as the reference data.

8. The touch position locating method as claimed in claim 6, wherein the step of obtaining the reference data according to the touch sensing data comprises:

selecting a plurality of key data from the plurality of touch sensing data;

calculating an average of the key data; and

taking the average as the reference data.

9. The touch position locating method as claimed in claim 6, wherein the touch panel is a capacitive touch panel or a resistive touch panel.

10. The touch position locating method as claimed in claim 6, wherein the touch sensing data are current signals or voltage signals.