Patent Application
20140117869
This application claims priority to Taiwan Application Serial Number 101140112, filed Oct. 30, 2012, which is herein incorporated by reference.
1. Field of Invention
The disclosure relates to a display device. More particularly, the disclosure relates to an electrical signal transmission method on a display device.
2. Description of Related Art
With the fast development of display technology, a digital display device has become popular in recent year. Most high-end display devices currently in the market are developed to have large screens, high resolutions and compact sizes. A traditional power supply module disposed in the display device usually includes a rectifier/stabilizer, a voltage converter and a voltage isolation structure. In general, the power supply module of the display device is connected via a power cable to an outlet of mains-electricity (e.g., household-electricity). The voltage converter is configured to convert an AC input (e.g., a three-phase AC voltage from 110 Volt. to 220 Volt.) provided by the outlet of mains-electricity into different system voltages and provide the voltages to other components (e.g., a display panel, a backlight source, a display processing circuit, a remote control signal receiving circuit, etc.) in the display device.
In order to save the power consumption during the stand-by period of the display device, the power supply module in the traditional display device must includes multiple voltage converters with different specifications (such as different sizes and different turns of windings) to convert the AC input into an operation voltage (e.g., 20 Volt., 30 Volt., 50 Volt. and other system operation voltages) or a stand-by voltage (such as 5 Volt.) However, in order to generate various power signals at different voltage levels, multiple voltage converters (each of which includes a magnetic core, a cable reel, coils on both sides and peripheral circuits) must be implemented in the traditional display device, such that the voltage converters will occupy extra space, increase the manufacturing cost and increase the electromagnetic interference (EMI) of the power supply module in the traditional display device. In addition, and the traditional power supply module requires a complex control circuit for providing a standby power, in order to save the energy consumption during the stand-by period.
Recently, parts of the display devices are capable of receiving their power signal wirelessly. However, aforementioned issues related to the traditional power supply module and the voltage converters are still existed in the display devices with wireless power transmission.
An aspect of the disclosure provides a display device with wireless power supply from power transmission means. The display device includes a display module, a system controlling module and a wireless power receiving module. The system controlling module is electrically connected to the display module. The wireless power receiving module is electrically connected to the system controlling module. The wireless power receiving module includes a plurality of near-field coil units. Each of the near-field coil units has an individual receiving frequency and an individual output power. The near-field coil units are configured to resonate with a transmission coil of the power transmission means. According to a transmission frequency on the transmission coil, the near-field coil unit with the corresponding receiving frequency generates an electricity supply with the corresponding output power to the system controlling module.
Another aspect of the disclosure provides a wireless power transmission system, including power transmission means and a display device. The power transmission means include a transmission coil and a frequency control module. The frequency controlling module is configured to adjust a transmission frequency on the transmission coil. The display device includes a display module, a system controlling module and a wireless power receiving module. The system controlling module is electrically connected to the display module. The wireless power receiving module is electrically connected to the system controlling module. The wireless power receiving module includes a plurality of near-field coil units. The near-field coil units have individual receiving frequencies and individual output powers. The near-field coil units include at least one first near-field coil unit and a second near-field coil unit. Each of the first near-field coil units has a first receiving frequency and a first output power corresponding to an operation power of the display device. The second near-field coil unit has a second receiving frequency and a second output power corresponding to a stand-by power of the display device. The near-field coil units are configured to resonate with a transmission coil of the power transmission means. According to the transmission frequency on the transmission coil, the first near-field coil unit or the second near-field coil unit with the corresponding frequency generates an electricity supply corresponding to the operation power or the stand-by power to the system controlling module. The wireless power receiving module feeds back and controls the transmission frequency of the power transmission means so as to make the display device operate with the operation power or the stand-by power.
In order to make the foregoing as well as other aspects, features, advantages, and embodiments of the disclosure more apparent, the accompanying drawings are described as follows:
In order to solve the aforesaid problem, a display device and a wireless power transmission system are provided by the disclosure. A wireless power receiving module of the display device has multiple near-field coil units. Each of the near-field coil units has an individual receiving frequency and an individual output power. According to a transmission frequency of a wireless-transmitted electrical signal, one of the near-field coil units with the corresponding receiving frequency may resonate with the wireless-transmitted electrical signal, such that the corresponding near-field coil unit will generate an electricity supply with a specific output power (e.g., with a specific output voltage).
In this case, the display device does not require any voltage converter for converting voltage into different levels. Various output powers can be formed on the display device by changing the transmission frequency of the wireless-transmitted electrical signal provided from the power transmission means. In addition, the display device can generate the electricity supplies including an electricity signal at an operation power and another electricity signal at a stand-by power, by implementing multiple passive near-field coil units without adding extra active components.
Referring to
As shown in
The display device 120 comprises a wireless power receiving module 122, a system controlling module 124 and a display module 126. The system controlling module 124 is electrically connected to the display module 126. The wireless power receiving module 122 is electrically connected to the system controlling module 124. The wireless power receiving module 122 comprises a plurality of near-field coil units, for example including three near-field coil units N1, N2 and N3 in the embodiment of
The near-field coil units N1, N2 and N3 are configured to resonate with the transmission coil 142 of the power transmission means 140. In this embodiment, each of the near-field coil units N1, N2 and N3 has individual receiving frequencies and individual output powers, which are different from each others. When the transmission frequency on the transmission coil 142 is changed, only one of the near-field coil units N1, N2 or N3 with the corresponding receiving frequency (i.e., the most approaching receiving frequency relative to the transmission frequency of the transmission coil 142) is triggered to resonate with the transmission coil 142 at highest degree among all of the near-field coil units N1, N2 or N3, because the receiving frequencies of the near-field coil units N1, N2 and N3 are different.
For example, when the transmission frequency on the transmission coil 142 is the most approached to the receiving frequency of the near-field coil unit N1, the near-field coil unit N1 generates an electricity supply V1 with the first output power to the system controlling module 124. At the same time, the near-field coil units N2 and N3 only have a little partial resonance with the transmission coil 142, and only a few electricity outputs may be generated.
Similarly, when the transmission frequency on the transmission coil 142 is nearest to the receiving frequency of the near-field coil unit N2 or N3, the near-field coil unit N2 or N3 generates an electricity supply V2 with a second output power or an electricity supply V3 with a third output power to the system controlling module 124 respectively. At the same time, the other two sets of near-field coil units only have a little partial resonance with the transmission coil 142, and only a few electricity outputs may be generated.
Referring to
As shown in
In this embodiment, the near-field coils NFC1, NFC2 and NFC3 are designed (e.g., with different turns of coils, different coil sizes or different coil materials, etc.) to have individual inductance values. Because of the aforesaid individual inductance values, the near-field coils NFC1, NFC2 and NFC3 may have individual output powers, such that the near-field coils NFC1, NFC2 and NFC3 generate the electricity supply V1 with the first output power, the electricity supply V2 with the second output power and the electricity supply V3 with the third output power respectively. In other words, the output powers of the near-field coil units N1, N2 and N3 can be determined by the inductance values of the near-field coils NFC1, NFC2 and NFC3.
In addition, the capacitors C1, C2 and C3 in the near-field coil units N1, N2 and N3 have individual capacitance values. The values of the resonance frequencies (i.e., the receiving frequencies) of the near-field coil units N1, N2 and N3 are determined by a reciprocal of a product of multiplying the inductance values of the near-field coil units N1, N2 and N3 (determined by the aforesaid near-field coils NFC1, NFC2 and NFC3) by the capacitance values of the near-field coil units N1, N2 and N3 (i.e., the capacitance values of the capacitors C1, C2 and C3).
Therefore, when the capacitance values of the aforesaid near-field coils NFC1, NFC2 and NFC3 are fixed, the values of the receiving frequencies of the near-field coil units N1, N2 and N3 can be designed by adjusting the capacitance values of the capacitors C1, C2 and C3 in the near-field coil units N1, N2 and N3. In other words, the near-field coil units N1, N2 and N3 have individual receiving frequencies which are determined by different capacitance values of the capacitors C1, C2 and C3.
As described above, through the inductance values of the near-field coils NFC1, NFC2 and NFC3 and the capacitance values of the capacitors C1, C2 and C3, the near-field coil units N1, N2 and N3 have individual receiving frequencies and individual output powers.
In this embodiment, the electricity supply V1 with the first output power (e.g., with a first output voltage level as 50 Volt.) generated by the near-field coil unit N1 and the electricity supply V2 with the second output power (e.g., with a second voltage level as 30 Volt.) generated by the near-field coil unit N2 can correspond to the operation powers required for the operation of the display device 120.
The electricity supply V3 with the third output power (e.g., with a third voltage level as 5 Volt.) generated by the near-field coil unit N3 corresponds to the stand-by power of the display device 120.
By changing the transmission frequency on the transmission coil 142 of the power transmission means 140, the individual output powers/output voltage levels can be generated by the induction effect on the display device 120, and the different operation powers required during an operating period the display device 120 or stand-by powers required during a stand-by period of the display device 120 can be further generated.
Reference is made to
As shown in the embodiment of
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The arrangement manners of the near-field coils NFC1, NFC2 and NFC3 in the aforesaid embodiments are all suitable to achieve the effect of the disclosure. Since not all the arrangement manners of the near-field coils can be described in the aforesaid embodiments, all the equivalent arrangement manners with similar structures or capable to achieve the same effect, should fall into the scope of the disclosure.
The wireless power receiving module 122 of the display device 120 having three sets of near-field coil units N1, N2 and N3 is described exemplarily in the aforesaid embodiments. The display device 120 of the disclosure comprises at least two sets of near-field coil units for generating the electricity supplies corresponding to the operation power and the stand-by power. In practical use, if there are more different powers/voltage levels are required by the display unit 120, more near-field coil units also can be disposed in the display unit 120 to generate more varied operation powers/voltage levels, and the disclosure is not limited to the three sets of near-field coil units.
With the wireless power transmission system 100 of the disclosure, the display device 120 does not required to implement additional transformers, and the electricity supplies with individual powers can be generated to the system controlling module 124 by utilizing the near-field coil units, which have simple structures and can be realized by passive components.
As shown in
In practical use, the remote control signal receiving circuit 124c may be an infrared signal receiver or other remote control signal receivers with the equivalent effect. The remote control signal receiving circuit 124c is configured to receive an external remote control instruction so as to switch the display device 120 between an operation state and a stand-by state.
The processing unit 124b is electrically connected to the system power conversion circuit 124a and the remote control signal receiving circuit 124c. According to the external remote control instruction received by the remote control signal receiving circuit 124c, the processing unit 124b generates a control signal Ctrl to a controller 122a in the wireless power receiving module 122.
According to the control signal Ctrl generated by the processing unit 124b, the controller 122a of the wireless power receiving module 122 transmits a feedback signal Sfb to the power transmission means 140 wirelessly, to feed back and control the transmission frequency on the transmission coil 142.
In this embodiment, the system power conversion circuit 124a is electrically connected to the near-field coil units N1 and N2.
For example, under the stand-by state, the transmission frequency on the transmission coil 142 corresponds to the receiving frequency of the near-field coil unit N3, and the near-field coil unit N3 generates the electricity supply V3 corresponding to the stand-by power. The electricity is supplied to the controller 122a, the remote control signal receiving circuit 124c and the processing unit 124b directly without using the system power conversion circuit 124a. Basic stand-by functions on the display device 120 (e.g., a remote control function, a stand-by lamp signal display and/or other basic functions) are active. In addition, under the stand-by state, the electricity supply V3 generated by the near-field coil unit N3 is not transmitted to the system power conversion circuit 124a and the display module 126, thereby saving the electricity consumption under the stand-by state.
When the remote control signal receiving circuit 124c receives the external remote control instruction representing “device on”, the remote control signal receiving circuit 124c transmits the control signal Ctrl to the controller 122a, and the controller 122a transmits the feedback signal Sfb to the power transmission means 140 wirelessly. At this time, according to the feedback signal Sfb, the frequency control module 144 of the power transmission means 140 can adjust the transmission frequency on the transmission coil 142 to correspond to the receiving frequency of the near-field coil unit N1 or the near-field coil unit N2, so as to switch the display device 120 from the stand-by state to the operation state.
In addition, as shown in
Referring to
The frequency control module 144 comprises a switching circuit 144a and a controlling circuit 144b. The switching circuit 144a is coupled with the transmission coil 142, including a plurality of switching units Q1-Q4 which are switched in an order. In this embodiment, the switching circuit 144a is a full-bridge inversion switching circuit, but the disclosure is not limited to this.
The controlling circuit 144b of the frequency control module 144 is configured to receive the feedback signal Sfb from the display device. According to the feedback signal Sfb, the controlling circuit 144b of the frequency control module 144 adjusts a switching frequency of the switching units Q1-Q4 so as to adjust the transmission frequency on the transmission coil 142.
Under the operation state, the transmission frequency on the transmission coil 142 corresponds to the receiving frequency of the near-field coil unit N1 or the near-field coil unit N2. The near-field coil unit N1 or the near-field coil unit N2 generates the electricity supply V1 or V2 corresponding to the operation power to the system power conversion circuit 124a, so that the system power conversion circuit 124a generates a system voltage signal Vs to supply power to the controller 122a, the remote control signal receiving circuit 124c, the processing unit 124b and the display module 126, thereby supplying the electricity under the normal operation state.
Under the operation state, the system controlling module 124 also can detect the operation voltage values of the near-field coil units N1, N2 and N3 to generate a voltage detecting signal Vdet to the controller 122a. The controller 122a can transmit the feedback signal Sfb to the power transmission means 140 wirelessly according to the voltage detecting signal Vdet. At this time, according to the feedback signal Sfb, the frequency control module 144 of the power transmission means 140 finely adjusts the transmission frequency on the transmission coil 142 (for example finely adjusting near the transmission frequency corresponding to the near-field coil unit N1) or switches the transmission frequency of the transmission coil 142 to transmission frequencies with different frequency bands (for example switching from the transmission frequency corresponding to the near-field coil unit N1 to the transmission frequency corresponding to the near-field coil unit N2).
Additionally, when the remote control signal receiving circuit 124c receives the external remote control instruction representing “device off”, the remote control signal receiving circuit 124c also can transmit the corresponding control signal Ctrl to the controller 122a, and the controller 122a transmits the feedback signal Sfb to the power transmission means 140 wirelessly. At this time, according to the feedback signal Sfb, the frequency control module 144 of the power transmission means 140 can adjust the transmission frequency on the transmission coil 142 to the receiving frequency of the corresponding near-field coil unit N3, so as to switch the display device 120 from the operation state to the stand-by state.
In view of the above, a display device and a wireless power transmission system are provided by the disclosure. The wireless power receiving module of the display device has multiple near-field coil units. The near-field coil units have individual receiving frequencies and individual output powers. According to the transmission frequency of the electrical signal which is transmitted wirelessly, the near-field coil unit with the corresponding receiving frequency resonates with the electrical signal so as to generate the electricity supply with a certain output power (e.g., with a certain output voltage). In this way, the display device may not need the voltage converter to perform the voltage conversion. The power transmission means can be configured to change the transmission frequency of the wireless transmission, so as to form various output powers on the display device. In addition, the display device can conveniently generate the electricity supply with an operation power and a stand-by power by only configuring multiple passive near-field coil units, without using additional active components.
Although the disclosure has been disclosed with reference to the above embodiments, these embodiments are not intended to limit the disclosure. Those of skills in the art can make various modifications and changes without departing from the spirit and scope of the disclosure. Therefore, the scope of the disclosure shall be defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 101140112 | Oct 2012 | TW | national |
