Finally, the keyboard microcontroller stores the current state of the identified keys in memory In one embodiment, if the state of any key in row of a keyswitch matrix is different from the corresponding state of the keys in that row that was previously stored in memory , then the keyboard microcontroller outputs the state of the keys in that row.
By outputting the state if and only if the above condition is true, then transmissions are reduced. Thus, the power required to operate the keyboard is also reduced. In one embodiment, the keyboard will output scan codes of the depressed keys. However, in other embodiments the outputted state of the identified keys need not include scan codes. The outputted state of the identified keys need only include information that is sufficient to allow the host computer microcontroller , or possibly the host computer microprocessor, to determine the state of the identified keys.
In another embodiment, the keyboard microcontroller may perform additional scans of the keyswitch matrix to distinguish between a current change that results from a depressed key and an aberrant current fluctuation. Only current changes that last for two or more scans would be considered to result from one or more depressed keys. In another embodiment, the switched power supply will receive electrical power from a battery In still another embodiment, the switched power supply may receive power from one or more solar cells In yet still another embodiment, the switched power supply may receive power from a RF signal.
This RF signal may be transmitted from the host computer RF transmitter or another RF transmitter that may or may not be coupled to the host computer In still another embodiment, the switched power supply may receive power from a plurality of the above sources.
For example, power may be supplied to the switched supply from a battery that is recharged by solar cells Alternatively, power may be supplied to the switched supply from a battery that is recharged by a RF signal. In another embodiment, the switched power supply will switch off a predetermined time after switching on. Alternatively, the switch power supply will switch off after one or more events.
For example, the switched power supply may switch off after the keyboard RF transmitter completes transmitting. In another embodiment, the keyboard does not have a power switch. In this embodiment, when the host computer is powered down, then the keyboard will be inactive.
In another embodiment, the RF transmitters and and receivers and may be replaced with infrared transmitters and receivers. In another embodiment, the data input into the RF transmitters and may be encoded for reliability. One primary advantage of the invention is that it reduces the power consumption of the keyboard. In particular, an embodiment of the invention that utilizes a serial-to-parallel register and a parallel-to-serial register has minimal power consumption.
The significant power reduction results from the fact that the keyboard's active electrical components are powered only during the time that they are actually in use. When the active electrical components are not in use, they are powered down. By reducing the power consumption, the battery life of the keyboard will be significantly extended.
Another advantage of the invention is that it allows a keyboard to be located remotely from a host computer. Because no keyboard cable is required to connect the keyboard to the host computer, remotely locating the keyboard will be possible. It will be appreciated by those of ordinary skill in the art having the benefit of this disclosure that numerous variations from the foregoing illustration will be possible without departing from the inventive concept described therein.
Accordingly, it is the claims set forth below, and not merely the foregoing illustration, which are intended to define the exclusive rights claimed in this application program. What is claimed is: 1. A method of determining the state of a keyboard key comprising: a transmitting a wireless first signal that identifies at least one keyboard key;.
The method of claim 1 wherein the step of transmitting a first signal that identifies the at least one keyboard key includes transmitting a RF signal that identifies the at least one keyboard key.
The method of claim 1 wherein the step of transmitting a first signal that identifies at least one keyboard key includes transmitting an infrared signal that identifies the at least one keyboard key.
The method of claim 1 wherein the step of transmitting a first signal that identifies at least one keyboard key includes transmitting a signal that identifies a row of a keyswitch matrix. The method of claim 1 wherein the step of transmitting a first signal that identifies at least one keyboard key includes transmitting a signal that identifies at least one row of a keyswitch matrix. The method of claim 6 wherein the step of transmitting the first signal that identifies at least one keyboard key includes transmitting a RF signal that identifies the at least one keyboard key.
The method of claim 6 wherein the step of transmitting the first signal that identifies at least one keyboard key includes transmitting an infrared signal that identifies the at least one keyboard key. The method of claim 6 wherein the step of transmitting the first signal that identifies at least one keyboard key includes transmitting a signal that identifies a row of a keyswitch matrix.
The method of claim 6 wherein the step of transmitting the first signal that identifies at least one keyboard key includes transmitting a signal that identifies at least one row of a keyswitch matrix. The method of claim 6 wherein the step of determining the state of the at least one keyboard key includes scanning at least one key circuit in the keyswitch matrix.
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