The present invention relates to terminal technologies, and particularly to a multimedia terminal and a method for switching a state of the multimedia terminal.
In recent years, multimedia terminals have been applied widely. Besides being applied in personal entertainments and business meetings, some multimedia terminals emerge in public places, e.g., for playing advertisements in buses, elevators and office buildings. In addition, some multimedia terminals with self-service functions come into use in some banks and government departments, these multimedia terminals can provide multimedia information to various users.
At present, most multimedia terminals in public places do not take special care for a case that nobody is around the multimedia terminal. Usually, the multimedia terminal keeps in operation round-the-clock. For example, a multimedia terminal used for playing advertisements will keep playing continuously whether there is an audience around or not; and an Automatic Teller Machine (ATM) or other multimedia terminals with the self-service functions will also keep in operation whether there is a user. However, there may be nobody for a rather long time. For example, it is quite possible that nobody is there for the whole night. Keeping in operation shortens lifetime of the multimedia terminal, especially a display device such as Cathode Ray Tube (CRT) and Thin-Film Transistor (TFT). Display circuit of the display device has high voltage circuits and light emitting devices such as filaments, tubes. Long time operation dramatically shortens the lifetime of the display device. Since the display device and a processor take a large part of power consumption of the multimedia terminal, the long time operation also wastes power, harms environment and wastes money.
In the prior art, there are some multimedia terminals capable of switching to a power-saving state automatically;
The multimedia terminal capable of automatically switching to the power-saving state can turn off automatically, but cannot turn on automatically. If not knowing the multimedia terminal, the public may think that the multimedia terminal goes wrong, which influence the normal use of the multimedia terminal.
Embodiments of the present invention provide a multimedia terminal and a method for switching a state of the multimedia terminal, so that the multimedia terminal may return to an operating state without a human operation.
According to one aspect of the present invention, a method for switching a state of a multimedia terminal includes: detecting for an infrared signal emitted by a human body around a multimedia terminal; and processing the infrared signal into a trigger signal, inputting the trigger signal into the multimedia terminal, and switching the multimedia terminal from a power-saving state to an operating state according to the trigger signal.
According to another aspect of the present invention, an infrared signal detection unit, configured to detect an infrared signal emitted by a human body around the multimedia terminal, convert the infrared signal into an electrical signal, and input the electrical signal to an infrared signal processing unit;
the infrared signal processing unit, configured to receive the electrical signal from the infrared signal detection unit, process the electrical signal into a trigger signal and input the trigger signal to a Central Processing Unit (CPU);
the CPU, configured to switch the multimedia terminal from a power-saving state to the operating state after receiving the trigger signal.
According to another aspect of the present invention, a multimedia terminal includes: a display and a power supply circuit for the display;
an infrared signal detection unit, configured to detect an infrared signal emitted by a human body around the multimedia terminal, convert the infrared signal into an electrical signal and input the electrical signal to an infrared signal processing unit;
the infrared signal processing unit, configured to receive the electrical signal from the infrared signal detection unit, process the electrical signal into a trigger signal and output the trigger signal to a controllable switch; and
the controllable switch, configured in the power supply circuit, connected between the display and a power supply and configured to put through the display with the power supply according to the trigger signal.
According to embodiments of the present invention, an infrared signal detection unit and an infrared signal processing unit are added to the existing multimedia terminal to make the multimedia terminal have an infrared signal detection function and thus capable of converting the infrared signal emitted by a human body around the multimedia terminal into a trigger signal and inputting the trigger signal to the multimedia terminal; once the multimedia terminal detects that a person moves around it, the multimedia terminal automatically switches to the operating state. Embodiments of the present invention prolong the lifetime of the multimedia terminal, reduce power consumption of the multimedia terminal and upgrade the multimedia terminal.
The present invention is hereinafter described in details with reference to accompanying drawings and embodiments to make the technical solution, objective and merits of the present invention more apparent.
As shown in
The infrared signal detecting unit is set on the surface of the multimedia terminal, includes a thermoelectrical infrared sensor and an optical lens; wherein the optical lens is used for enlarging a detection scope of the thermoelectrical infrared sensor. The thermoelectrical infrared sensor is configured to face to objects to be detected. The optical lens is configured in front of the thermoelectrical infrared sensor and usually adopts a Fresnel lens. Thus, the infrared signal emitted by the surroundings may be infracted to the thermoelectrical infrared sensor by the Fresnel lens. The thermoelectrical infrared sensor determines whether there is a person around the multimedia terminal by sensing a difference between the infrared signal emitted by the human body and that emitted by the surroundings. The thermoelectrical infrared sensor includes two thermoelectrical units in series or parallel connection. Electric polarization directions of two thermoelectrical units are opposite to each other. The infrared signal emitted by the surroundings produces almost the same effect on two thermoelectrical units, thus thermoelectrical effects generated by two thermoelectrical units counteract each other and no electrical signal is outputted. Once a person enters into the detection area, the infrared signal emitted by the human body is focused by the Fresnel lens and received by the thermoelectrical units. In this case, quantities of heats received by two thermoelectrical units are different. Therefore the thermoelectrical quantities are different and cannot counteract each other, thereby there is an electrical signal outputted. If the detection scope is not required to be very large, the infrared signal detection unit may also not include the optical lens.
The infrared signal processing unit may be installed on a single board inside the multimedia terminal, usually implemented by an infrared sensor signal processor. The infrared sensor signal processor includes an amplifying circuit, a comparing circuit and a filter circuit connected in series. After receiving the electric signal from the thermoelectrical infrared sensor, the infrared sensor signal processor processes the electric signal including amplifying, comparing and filtering in successive. After processing the electrical signal, the infrared sensor signal processor outputs a trigger signal to an interrupt pin or an I/O pin of the CPU. The CPU receives the trigger signal through an interrupt manner or a query manner. After receiving the trigger signal, the CPU switches the multimedia terminal from the power-saving state to the operating state if the multimedia terminal is in the power-saving state, or keeps the multimedia terminal in the operating state if the multimedia terminal is in the operating state.
As shown in
Different types of multimedia terminals enter into the power-saving state in different ways. For the multimedia terminal whose CPU and display support the power-saving state, if the multimedia terminal is in the operating state and does not receive the trigger signal after the preconfigured time interval, both the CPU and the display of the multimedia terminal enter into the power-saving state. For the multimedia terminal whose CPU supports the power-saving state but the display does not support the power-saving state, a controllable switch may by added to a power supply circuit of the display. The controllable switch may be a relay or a controllable silicon switch. Hereinafter the relay is taken as an example. An appropriate control voltage may be applied to a control end of the relay to open or close the relay, thereby control the power supply of the display. Preferably, the relay is normally closed, i.e., without an action in a control circuit, the relay is put through in default. Thus, even if a process circuit is down, the display can be supplied with power normally.
As shown in
An example is hereinafter given to further describe effects brought by the embodiments of the present invention. The solution provided by the embodiments of the present invention may be used in a videophone. Besides functions of the traditional videophone, the videophone in this example may have a function of playing advertisements after subscribing for an advertisement service by cooperating with a network provider. In the advertisement service, the advertisements are sent to the videophone by a server. By applying the solution provided by the embodiments of the present invention, when a person passes by the videophone, screen of the videophone will automatically turn on to display the advertisements. After being displayed, the advertisements may be saved locally for future query or erased by an owner. Even though the videophone will stop playing after a time period without human operation, the videophone is able to play the advertisements automatically once a person passes by, which enhanced effects for playing advertisements and avoids waste of resources brought by continuous playing.
The solution of the present invention can be modified appropriately during the detailed implementation, to meet the detailed requirements of the specific cases. It is thereby understood that the specific embodiments according to the present invention are just demonstrative, and are not for use in limiting the protection scope of the present invention.
Number | Date | Country | Kind |
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200510059604.4 | Mar 2005 | CN | national |
This application is a continuation of International Patent Application No. PCT/CN2006/000503, filed Mar. 24, 2006, which claims priority to Chinese Patent Application No. 200510059604.4, filed Mar. 29, 2005, both of which are hereby incorporated by reference.
Number | Date | Country | |
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Parent | PCT/CN2006/000503 | Mar 2006 | US |
Child | 11862826 | US |