Remote-controllable electronic device

1. A remote-controllable electronic device, comprising:

a casing with a hole;

a filter having a U-shape cross-section with an inner edge and an outer edge, a flat surface area of said outer edge of said filter being substantially the same size of and being embedded to said hole of said casing, wherein said flat surface area of said outer edge of said filter is substantially coplanar with an outer surface of said casing;

a sensor disposed within said casing and configured to receive a light signal filtered by said filter; and

a shielding element disposed on said inner edge of said filter by at least portion of the outer rim of said shielding element wedged with said inner edge of said filter and disposed in front of said sensor so as to specify a receiving range for said light signal received by said sensor in a specific direction;

wherein an open angle is defined as the maximum angle of said light signal filtered by said filter and received by said sensor while in the absence of said shielding element in the specific direction, and a specific open angle of the specified receiving range is defined as the maximum angle of said light signal passed through said shielding element and received by said sensor in the specific direction, wherein said specific open angle is smaller than said open angle.

2. The remote-controllable electronic device of claim 1 , wherein said casing further comprises a protrusion, said filter comprises a cavity, and wherein said protrusion is engaged with said cavity when said filter is embedded to said hole of said casing.

3. The remote-controllable electronic device of claim 1 , wherein said light signal comprises a light signal emitted by a remote control.

4. The remote-controllable electronic device of claim 1 , wherein said shielding element is disposed between said filter and said sensor so as to hinder a portion of said filtered light signal from being received by said sensor.

5. The remote-controllable electronic device of claim 1 , wherein said shielding element is adhered to said filter.

6. The remote-controllable electronic device of claim 1 , wherein said shielding element is a coating material coated on said filter.

7. The remote-controllable electronic device of claim 6 , wherein said shielding element is disposed to define a portion of said filter as being a predetermined geometric shape.

8. The remote-controllable electronic device of claim 7 , wherein said predetermined geometric shape comprises a circle, an oval, and a rectangle.

9. The remote-controllable electronic device of claim 1 , wherein said receiving range comprises a horizontal receiving range and a vertical receiving range, and said shielding element is disposed so that said horizontal receiving range is larger than said vertical receiving range.

10. The remote-controllable electronic device of claim 1 , wherein said receiving range comprises a horizontal receiving range and a vertical receiving range, and said shielding element is disposed so that said horizontal receiving range is substantially equal to said vertical receiving range.

11. The remote-controllable electronic device of claim 1 , wherein said shielding element is movable along said inner edge of said filter so as to adjust said receiving range for said light signal.

12. The remote-controllable electronic device of claim 11 , wherein said receiving range for said light signal is increased when said shielding element moves toward said sensor.

13. The remote-controllable electronic device of claim 11 , wherein said receiving range for said light signal is decreased when said shielding element moves away from said sensor.

14. A remote-controllable electronic device, comprising:

a casing with a hole;

a filter having a U-shape cross-section with an outer edge, a flat surface area of said outer edge of said filter being substantially the same size of and being embedded to said hole of said casing, wherein said flat surface area of said outer edge of said filter is substantially coplanar with an outer surface of said casing;

a sensor disposed within said casing and configured to receive a light signal filtered by said filter; and

a shielding element directly coated on an inner surface of said filter so as to specify a receiving range for said light signal received by said sensor in a specific direction;

wherein an open angle is defined as the maximum angle of said light signal filtered by said filter and received by said sensor while in the absence of said shielding element in the specific direction, and a specific open angle of the specified receiving range is defined as the maximum angle of said light signal passed through said shielding element and received by said sensor in the specific direction, wherein said specific open angle is smaller than said open angle.

15. A remote-controllable electronic device, comprising:

a casing with a hole;

a filter having a U-shape cross-section with an outer edge, a flat surface area of said outer edge of said filter being substantially the same size of and being embedded to said hole of said casing, wherein said flat surface area of said outer edge of said filter is substantially coplanar with an outer surface of said casing;

a sensor disposed within said casing and configured to receive a light signal filtered by said filter; and

a shielding element adhered to an inner surface of said filter so as to specify a receiving range for said light signal received by said sensor in a specific direction;

wherein an open angle is defined as the maximum angle of said light signal filtered by said filter and received by said sensor while in the absence of said shielding element in the specific direction, and a specific open angle of the specified receiving range is defined as the maximum angle of said light signal passed through said shielding element and received by said sensor in the specific direction, wherein said specific open angle is smaller than said open angle.