Extension keyboard, electronic device and keyboard extension system

Abstract

The invention provides an extension keyboard which comprises a plurality of keys and a plurality of conductive contacts. Each key is electrically connected with one or more conductive contacts in an only corresponding mode. The conductive contacts are arranged on the back of the extension keyboard, exposed and used for making contact with a multi-point touch screen of an electronic device when the extension keyboard is arranged on the electronic device with the multi-point touch screen. When one key is operated, the conductive contact which only corresponds and is electrically connected with the key transmits the operation to the multi-point touch screen to touch the position, connected with the conductive contact, of the key. The invention provides the electronic device using the extension keyboard and a keyboard extension system with the extension keyboard and the electronic device; the structure is simple, the cost is low, and great influence on original display of the touch screen is avoided.

Description

technical field [0001] The invention relates to a keyboard, in particular to an extended keyboard applied to a multi-point touch screen device, an electronic device using the extended keyboard and a keyboard extended system. Background technique [0002] Currently, portable electronic devices with touch screens are becoming more and more common. When performing key input, the current touch screen usually displays a virtual keyboard for the user to input. However, when the electronic device displays the virtual keyboard, it generally occupies nearly half of the display area of ​​the touch screen of the electronic device, so that the displayed content is greatly reduced, which is not conducive to the user's operation. Now, extended keyboards for portable devices have also appeared. However, the current extended keyboards are usually connected to electronic devices through interfaces such as a USB interface. The structure of the extended keyboard is complicated, requiring corr...

AI Technical Summary

Problems solved by technology

However, when an electronic device displays a virtual keyboard, it generally occupies nearly half of the display area of ​​the touch screen of the electronic device, making the displayed content greatly reduced, which is not conducive to the user's operation.

Now, extended keyboards for portable devices have also appeared. However, the current extended keyboards are usually connected to electronic devices through interfaces such as USB interfaces. The structure of extended keyboards is complicated, requiring corresponding keyboard processing circuits and chips, and the price is relatively expensive.

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