COMPUTER SYSTEM AND RELATED METHOD FOR CALIBRATING A DIGITIZER WITHOUT UTILIZING CALIBRATION SOFTWARE

• US 20050093831A1
• Filed: 03/30/2004
• Published: 05/05/2005
• Est. Priority Date: 10/29/2003
• Status: Active Grant

• Current Assignee: IEI Integration Corp.
• Original Assignee: IEI Integration Corp.
• Inventors: Wang, Han-Che
• Granted Patent: US 7,327,353 B2
• 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
• CPC Class Codes: H04N 17/04 for receivers

Abstract

A computer system includes a screen for displaying images, a central processing unit (CPU) for controlling the operation of the computer system, an on-screen display (OSD) circuit electrically connected to the CPU and the screen for controlling the screen to display a plurality of test marks according to a plurality of predetermined coordinate values, a touch panel installed parallel to the display face of the screen for generating a plurality of test sensing signals according to positions at which it is triggered, and a control circuit electrically connected to the touch panel and the CPU for calibrating the coordinate values converted by the control circuit from the sensing signals generated by triggering the touch panel, according to the plurality of predetermined coordinate values and the plurality of test sensing signals.

Claims

1. A computer system, comprising:

a screen for displaying images;

a central processing unit (CPU) for controlling the operation of the computer system;

an on-screen display (OSD) circuit electrically connected to the CPU and the screen, for controlling the screen to display a plurality of test marks according to a plurality of predetermined coordinate values;

a touch panel installed parallel to the display face of the screen, for generating a plurality of test sensing signals according to positions at which it is triggered; and

a control circuit electrically connected to the touch panel and the CPU, for calibrating the coordinate values converted by the control circuit from the sensing signals generated by triggering the touch panel, according to the predetermined coordinate values and the test sensing signals.

2. The computer system of claim 1, further comprises a display drive circuit electrically connected to the CPU and the OSD circuit for generating video drive signals to drive the screen, wherein the OSD circuit controls the video drive signals to drive the screen to display the test marks.

3. The computer system of claim 2, wherein the video drive signals are used for driving the screen to display a predetermined image, and the OSD circuit controls the video drive signals to overlay the test marks on the predetermined image.

4. The computer system of claim 2, wherein the control circuit reads signals from the display drive circuit to determine the resolution of the screen and controls the predetermined coordinate values according to the resolution of the screen.

5. The computer system of claim 1, wherein the control circuit utilizes a universal serial bus (USB) to transmit the sensing signals generated by triggering the touch panel to the CPU.

6. The computer system of claim 1, wherein the touch panel is an electro-resistive touch panel.

7. The computer system of claim 1, wherein the touch panel is an electromagnetic touch panel.

8. The computer system of claim 1, wherein the control circuit converts the test sensing signals into a plurality of test coordinate values, and calibrates the coordinate values converted by the control circuit from the sensing signals generated by triggering the touch panel, according to the predetermined coordinate values and the test coordinate values.

9. The computer system of claim 1, wherein the control circuit outputs test display data to the OSD circuit, and the OSD circuit generates the predetermined coordinate values according to the test display data.

10. A method for calibrating coordinate values generated by a touch panel, comprising:

(a) utilizing a plurality of predetermined coordinate values by means of the on-screen display (OSD) to control a screen to display a plurality of test marks;

(b) generating a plurality of test coordinate values according to positions at which a touch panel is triggered; and

(c) calibrating the coordinate values of sensing signals generated by triggering the touch panel according to the predetermined coordinate values and the test coordinate values.

11. The method of claim 10, wherein Step (a) further comprises a step of

receiving video drive signals corresponding to a predetermined image, and controlling the video drive signals to overlay the test patterns on the predetermined image.

12. The method of claim 10, wherein Step (c) utilizes the interpolation method to calibrate the coordinate values generated by triggering the touch panel.

13. The method of claim 10, wherein Step (a) further comprises a step of

receiving video drive signals corresponding to a predetermined image in order to determine the resolution of the screen, and controlling the predetermined coordinate values according to the resolution of the screen.