MOBILE TERMINAL KEY INPUT DEVICE AND METHOD

Abstract

A mobile terminal keypad is provided having a plurality of key switches on the keypad that provides a first signal or a second signal according to the pressure applied to the key switch. In each of the plurality of key switches, a plate is provided to sequentially contact with a first contact and a second contact according to the applied pressure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be described in detail with reference to the following drawings in which like numerals refer to like elements.

FIG. 1 is a block diagram of a mobile terminal according to one embodiment of the present invention.

FIG. 2 is a flowchart for providing a signal from a keypad of the mobile terminal of FIG. 1.

FIG. 3 is a flowchart for processing a key input by the mobile terminal according to one embodiment of the present invention.

FIG. 4A is an exploded perspective view of a key switch of a keypad according to one embodiment of the present invention.

FIG. 4B is a side sectional view of the key switch of FIG. 4A.

FIGS. 5A to 5B are side sectional views of a key switch according to one embodiment of the present invention.

FIGS. 6A to 6C are side sectional views of a key switch according to another embodiment of the present invention.

FIGS. 7A to 7C are side sectional views of a key switch according to yet another embodiment of the present invention.

FIGS. 8A to 8C are side sectional views of a key switch according to still another embodiment of the present invention.

FIGS. 9A to 9C are front views of the external appearance of the mobile terminal according to the present invention, in which examples of the functions of the mobile terminal keypad according to the present invention are illustrated.

FIG. 10 is a front view of the external appearance of a mobile terminal from which a feedback signal is provided according to an embodiment of the present invention.

Claims

1. A mobile terminal comprising: a key input device comprising a plurality of key switches, each key switch comprises at least two contact points, a plate formed over the contact points, and a key button formed over the plate, wherein pressing the key button urges the plate to sequentially contact each of the at least two contact points, wherein the plate sequentially contacts each of the at least two contact points according to the pressure applied to the key button, anda controller providing control signals in accordance with the sequential contacts of the plate with the at least two contact points.

2. The mobile terminal of claim 1, wherein one of the control signals is a number key signal in accordance with a first contact of the plate and one of the at least two contact points, and another of the control signals is a navigation key signal in accordance with a next contact of the plate and another of the at least two contact points.

3. The mobile terminal of claim 1, wherein one of the control signals is a number key signal in accordance with a first contact of the plate and one of the at least two contact points, and another of the control signals is a hot key signal in accordance with a next contact of the plate and another of the at least two contact points.

4. The mobile terminal of claim 3, wherein the hot key signal is one of “send”, “start” and “end”.

5. The mobile terminal of claim 1, wherein the controller feeds back at least one of the control signals to provide a feedback signal for checking user input.

6. The mobile terminal of claim 1, further comprising a display for displaying the result of processing the control signals.

7. The mobile terminal of claim 1, wherein the plate is concave, convex, or concavo-convex.

8. The mobile terminal of claim 7, wherein each of the at least two contact points is formed on a protrusion in accordance with the shape of the plate.

9. The mobile terminal of claim 1, wherein the key button comprises: a first jaw for urging the plate into contract with a first protrusion when a first pressure is applied to the key button; anda second jaw for urging the plate into contact with a second protrusion when a second pressure is applied to the key button,wherein the second pressure is greater than the first pressure.

10. The mobile terminal of claim 1, wherein the plate is dome-shaped having an outer circumference and a central point, and wherein the dome-shaped plate is curved to the key button,wherein the at least two contact points comprise a first contact point that contacts the outer circumference of the dome shaped plate and a second contact point that contacts a central point of the dome shaped plate, andwherein a first and second jaw are formed on the surface of the key button,wherein the first jaw urges the outer circumference of the dome shaped plate to the first contact point in accordance with the applied pressure,wherein the second jaw urges the central point of the dome shaped plate to the second contact point in accordance with an applied pressure greater than that required to urge the circumference of the dome shaped plate to the first contact point.

11. The mobile terminal of claim 10, wherein, with increasing pressure applied to the key button, the central point of the dome shaped plate contacts a first protrusion formed in a substrate to establish a first contact, and subsequently the outer circumference of the dome shaped plate contacts a second protrusion formed on the substrate thereby establishing a second contact.

12. The mobile terminal of claim 11wherein concavo-convex regions having different distances to the at least two contact points are formed on the plate, andwherein jaws formed on a lower surface of the key button correspond to the at least two contact points for urging the plate to the contact points.

13. A key input device comprising a plurality of key switches, the key input device comprising: at least two contact points formed in a substrate;a plate formed over the at least two contact points; anda key button formed over the plate for urging the plate into sequential contact with the at least two contact points according to pressure applied to the key button.

14. The key input device of claim 13, wherein the plate has concave, convex, or concavo-convex regions corresponding to different distances between the key button and the at least two contact points.

15. The key input device of claim 13, wherein each of the at least two contact points is formed on a protrusion having a height in accordance with the shape of the plate.

16. The key input device of claim 15, wherein the at least two contact points comprise: a first contact point for contacting a region of the plate responsive to a first pressure applied to the key button to provide a first signal; anda second contact point for contacting another region of the plate responsive to a second pressure applied to the key button to provide a second signal,wherein the second pressure is greater than the first pressure.

17. The key input device of claim 16, wherein the key button comprises: a first jaw for urging the plate a predetermined distance to the first contact point responsive to the first pressure applied to the key button; anda second jaw for urging the plate a further distance to the second contact point responsive to the second pressure applied to the key button.

18. The key input device of claim 13, wherein the plate is dome-shaped having an outer circumference and a central point, and wherein the dome-shaped plate is curved to the key button,wherein the at least two contact points comprise a first contact point that contacts the outer circumference of the dome shaped plate and a second contact point that contacts the central point of the dome shaped plate, andwherein a first and second jaw are formed on the surface of the key button,wherein the first jaw urges the outer circumference of the dome shaped plate to the first contact point in accordance with the applied pressure,wherein the second jaw urges the central point of the dome shaped plate to the second contact point in accordance with an applied pressure greater than that required to urge the circumference of the dome shaped plate to the first contact point.

19. The key input device of claim 13, wherein jaws formed on the lower surface of the key button correspond to the at least two contact points for urging the plate to the at least two contact points.

20. The key input device of claim 13, wherein the plate is dome shaped having an outer circumference and a central point, and wherein the dome-shaped plate is to be curved to the substrate, andwherein, with increasing pressure applied to the key button, the central point of the dome shaped plate contacts a first protrusion formed in the substrate to establish a first contact, and subsequently the circumference of the dome shaped plate contacts a second protrusion formed on the substrate thereby establishing a second contact.

21. A method for processing a key input device of a mobile terminal, the method comprising: receiving a key switch signal from the key input device that sequentially generates at least two signals in accordance with the pressure applied to the key input device;determining whether the key switch signal is a first signal or a second signal in accordance with a pressure applied to the key input device; andprocessing a function according to whether the key switch signal is the first or the second signal.

22. The method of claim 21, wherein receiving the key switch signal comprises receiving a first signal from a first contact point according to a first pressure, and a second signal from a second contact point according to a second pressure, wherein the second pressure is greater than the first pressure, andwherein processing a function comprises processing a first function when the first signal is provided and processing a second function with the second signal is provided.

23. The method of claims 22, wherein the first function is processing a number key corresponding to key input device, and wherein the second function is processing a navigation function corresponding to key input device.

24. The method of claim 211 further comprising feeding back at least one of the first signal and the second signal to display the input.