Electronic device having touch panel and operating control method

1. An electronic device comprising:

a touch panel to be operated by a pointing means;

a position detecting portion that detects, when sensing that the pointing means comes close to a first position away from the touch panel by a first distance, a first coordinate on the touch panel corresponding to the first position, and detects, when sensing that the pointing means comes close to a second position lying closer to the touch panel than the first position, a second coordinate on the touch panel corresponding to the second position;

an operating control portion that controls an operation of a controlled portion based on the first coordinate and the second coordinate; and

a detection sensitivity control portion that switches, after the position detecting portion senses that the pointing means comes close to the first position, detection sensitivity of the position detecting portion from first sensitivity to the second sensitivity, wherein the position detecting portion is capable of sensing that the pointing means comes close to the first position in the first sensitivity, and the position detecting portion is capable of sensing that the pointing means comes to close the second position in the second sensitivity.

2. The electronic device according to claim 1 , wherein the operating control portion controls the operation of the controlled portion based on an X difference value between an X coordinate value of the first coordinate and an X coordinate value of the second coordinate or a Y difference value between a Y coordinate value of the first coordinate and a Y coordinate value of the second coordinate.

3. The electronic device according to claim 1 , wherein the operating control portion calculates an X difference value between an X coordinate value of the first coordinate and an X coordinate value of the second coordinate and a Y difference value between a Y coordinate value of the first coordinate and a Y coordinate value of the second coordinate, compares an absolute value of the X difference value with an absolute value of the Y difference value, selects either one of the X difference value and the Y difference value according to the comparison result, and controls the operation of the controlled portion based on the selected difference value.

4. The electronic device according to claim 1 , wherein the operating control portion calculates an angle between a line connecting a point indicated by the first coordinate to a point indicated by the second coordinate and a certain line on an operation surface of the touch panel, and controls the operation of the controlled portion based on the calculated angle.

5. The electronic device according to claim 1 , further comprising a display portion that is arranged to correspond to the touch panel and displays a different image thereon depending on a visual angle.

6. An operating control method for controlling an operation of an electronic device having a touch panel to be operated by a pointing means, the method comprising:

detecting, when sensing that the pointing means comes close to a first position away from the touch panel by a first distance, a first coordinate on the touch panel corresponding to the first position under a situate where detection sensitivity is set to first sensitivity;

switching, after sensing that the pointing means comes close to the first position, the detection sensitivity from the first sensitivity to second sensitivity capable of sensing that the pointing means comes to close a second position lying closer to the touch panel than the first position;

detecting, when sensing that the pointing means comes close to the second position, a second coordinate on the touch panel corresponding to the second position; and

controlling an operation of an controlled portion of the electronic device based on the first coordinate and the second coordinate.