TOUCH SCREEN DEVICE AND METHOD OF ELIMINATING NOISE THEREOF, AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME

• US 20070262969A1
• Filed: 05/10/2007
• Published: 11/15/2007
• Est. Priority Date: 05/11/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PAK, Sang Jin
• Application Number:
  US11/747,017
• Publication Number:
  US 20070262969A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment

Abstract

A touch screen device, a method of eliminating a noise thereof and a liquid crystal display having the same include converting an analog signal inputted from a plurality of sensors of a touch screen into digital raw data, aligning the digital raw data on a frame basis, eliminating an offset noise from the digital raw data aligned on a frame basis, and identifying a sensor signal within the digital raw data by comparing a variation of the digital raw data in a previous frame to a variation of the digital raw data in a current frame.

Claims

1. A method of eliminating noise of a touch screen, the method comprising:

generating digital raw data by converting an analog signal inputted from a plurality of sensors of the touch screen;

aligning the digital raw data on a frame basis;

eliminating an offset noise from the digital raw data aligned on a frame basis; and

identifying a sensor signal within the digital raw data by comparing a variation of the digital raw data in a previous frame to a variation of the digital raw data in a current frame.

2. The method of claim 1, wherein the digital raw data comprises the sensor signal, the offset noise and a random noise.

3. The method of claim 1, wherein the aligning the digital raw data on a frame basis comprises sampling the digital raw data to extract desired data from the digital raw data aligned on a frame basis.

4. The method of claim 1, wherein the eliminating the offset noise comprises subtracting the offset noise corresponding to an average of the digital raw data received from the plurality of sensors over time.

5. The method of claim 2, further comprising eliminating the random noise from the digital raw data.

6. The method of claim 5, wherein the eliminating the random noise from the digital raw data comprises subtracting a random noise component of the previous frame from the digital raw data in the current frame.

7. A touch screen device comprising:

a touch screen having a plurality of sensors;

an analog-to-digital converting unit which generates digital raw data by converting an analog signal measured by the plurality of sensors; and

a digital signal processing unit which aligns the digital raw data on a frame basis, eliminates an offset noise from the digital raw data aligned on a frame basis, and identifies a sensor signal within the digital raw data by comparing a variation of the digital raw data in a previous frame to a variation of the digital raw data in a current frame.

8. The touch screen device of claim 7, wherein the digital signal processing unit further eliminates a random noise from the digital raw data by subtracting a random noise component of the previous frame from the digital raw data in the current frame.

9. A liquid crystal display device, comprising:

a liquid crystal display;

a touch screen having a plurality of sensors;

an analog-to-digital converting unit which generates digital raw data by converting an analog signal measured by the plurality of sensors into digital data; and

a digital signal processing unit which aligns the digital raw data on a frame basis, eliminates an offset noise from the digital raw data aligned on a frame basis, identifies a sensor signal within the digital raw by comparing a variation of the digital raw data in a previous frame to a variation of the digital raw data in a current frame, and outputs the identified sensor signal to the liquid crystal display.

10. The liquid crystal display device of claim 9, wherein the digital signal processing unit further eliminates a random noise from the digital raw data by subtracting a random noise component of the previous frame from the digital raw data in the current frame.