CN101505338B - Mobile phone, interface converter thereof and method for outputting VGA signal - Google Patents
Mobile phone, interface converter thereof and method for outputting VGA signal Download PDFInfo
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- CN101505338B CN101505338B CN2009100783049A CN200910078304A CN101505338B CN 101505338 B CN101505338 B CN 101505338B CN 2009100783049 A CN2009100783049 A CN 2009100783049A CN 200910078304 A CN200910078304 A CN 200910078304A CN 101505338 B CN101505338 B CN 101505338B
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Abstract
The invention discloses a mobile phone, an interface convertor and a method for outputting a VGA signal. The mobile phone is additionally provided with a video and VGA coder, a VGA matching circuit and a VGA signal outputting interface; a digital tricolor signal output by a central processor of the mobile phone is processed by the video and VGA coder and the VGA matching circuit into the VGA signal; the VGA signal is sent to a display device connected with the interface convertor through the VGA signal outputting interface and the interface convertor externally connected with the mobile phone so as to realize the output of the VGA signal by the mobile phone; contents displayed in the mobile phone can be put in externally-connected display equipment and are displayed; a user only needs to carry the mobile phone and the interface convertor without carrying a heavy notebook computer and can conveniently demonstrate on a projector and other equipment with a standard VGA interface for clients and other people with the requirement and improves the efficiency of mobile work.
Description
Technical field
The present invention relates to the video signal treatment technique field, relate in particular to the method for a kind of mobile phone and interface convertor thereof and its outputting VGA signal.
Background technology
Increasing along with the mobile office demand, it is extremely important that the mobile office function of mobile phone becomes, and common this mobile phone all is equipped with office software, can realize individual's mobile office.Yet present mobile phone is not supported the function (VGA is a kind of display standard of analog video signal) of outputting VGA (Video GraphicsArray shows the drawing array) signal, and user's mobile office generally need be carried heavy notebook computer.Therefore, content displayed can not be placed on the external display device and show on the present mobile phone, has the personage who needs to do demonstration with the convenient client of giving or other, improves the efficient of mobile office.
Summary of the invention
The invention provides the method for a kind of mobile phone and interface convertor thereof and its outputting VGA signal; To realize the mobile phone outputting VGA signal; Content displayed can be placed on the external display device to be shown; There is the personage who needs to do demonstration with the convenient client of giving or other, improves the efficient of mobile office.
For achieving the above object, one aspect of the present invention provides a kind of mobile phone, comprises central processing unit, LCD, power management module and power circuit;
Said central processing unit is used for transmitting digital tricolor signal to said LCD, and transmits the power supply steering order to said power management module;
Said power management module is used for controlling according to said power supply steering order the state of said power circuit, and gives said central processing unit with the feedback of status of said power circuit;
Said power circuit is used for respectively to said central processing unit and said LCD power supply;
Said mobile phone also comprises video and VGA scrambler, VGA match circuit and VGA signal output interface;
Said video and VGA scrambler are used under the control of said central processing unit, detecting said mobile phone and whether are circumscribed with display; If be circumscribed with display; Then receive the digital tricolor signal that said central processing unit transmits, and convert said digital tricolor signal to the simulation tricolor signal;
Said VGA match circuit is used for said simulation tricolor signal is matched to the VGA signal;
Said VGA signal output interface is used for said VGA signal output;
Said power circuit is respectively to said video and VGA scrambler, VGA match circuit and the power supply of VGA signal output interface.
Mobile phone of the present invention, said VGA signal output interface are one of USBMINI10PI/O interface, USBMINI8PI/O interface, USBMINI12PI/O interface, blue tooth interface, WIFI interface, WIMAX interface.
Mobile phone of the present invention, said central processing unit is made up of cpu chip MCIMX31VKN5B and peripheral circuit thereof, and said video and VGA scrambler are made up of VGA coding chip CHRONTEL CH7026 and peripheral circuit thereof;
The P21 pin of said cpu chip MCIMX31VKN5B; The N20 pin; The N21 pin; The R26 pin; The N25 pin; The H25 pin; The J24 pin; The V20 pin; The AA26 pin; The W24 pin; The AA25 pin; The V21 pin; The Y26 pin; The Y25 pin; The V24 pin; The W26 pin; The U21 pin; The W25 pin; Pin; The U24 pin; The V26 pin; The T20 pin; The V25 pin; The T21 pin; Corresponding successively the 6th pin with said VGA coding chip CHRONTEL CH7026 of U26 pin and T24 pin; The 80th pin; The 50th pin; The 79th pin; The 78th pin; The 38th pin; The 39th pin; The 75th pin; The 74th pin; The 73rd pin; The 72nd pin; The 71st pin; The 70th pin; The 65th pin; The 64th pin; The 63rd pin; The 62nd pin; The 61st pin; The 60th pin; The 57th pin; The 56th pin; The 55th pin; The 54th pin; The 53rd pin is connected with the 52nd pin.
Mobile phone of the present invention, said video and VGA scrambler detect said mobile phone and whether are circumscribed with display under the control of said central processing unit, comprising:
Said central processing unit is sent to said video and VGA scrambler with reset signal, clock signal and I2C control signal, said video of initialization and VGA scrambler,
Said video and VGA scrambler send said I2C control signal to said VGA match circuit,
Said VGA match circuit sends said I2C control signal to said VGA signal output interface,
Said VGA signal output interface sends testing result to said VGA match circuit,
Said VGA match circuit sends said testing result to said video and VGA scrambler,
Said video and VGA scrambler send said testing result to said central processing unit;
Said video and VGA scrambler receive the digital tricolor signal that said central processing unit transmits, and convert said digital tricolor signal to the simulation tricolor signal, comprising:
Said video receives digital tricolor signal with the VGA scrambler and becomes simulation tricolor signal and analogue synchronization signal with digital synchronization signal and with said digital tricolor signal with the digital synchronization signal corresponding conversion, and said simulation tricolor signal and analogue synchronization signal are delivered to said VGA match circuit;
Said VGA match circuit is used for said simulation tricolor signal is matched to the VGA signal, comprising:
Said VGA match circuit carries out level conversion, impedance matching and Filtering Processing with said simulation tricolor signal and analogue synchronization signal, generates said VGA signal.
Mobile phone of the present invention, said VGA match circuit comprises level shifting circuit, impedance matching circuit and filtering circuit;
The input end of said level shifting circuit is connected with said cpu chip MCIMX31VKN5B, and the output terminal of said level shifting circuit is connected with said VGA signal output interface;
The input end of said impedance matching circuit is connected the output head grounding of said impedance matching circuit with said cpu chip MCIMX31VKN5B;
The input end of said filtering circuit is connected with said cpu chip MCIMX31VKN5B, and the output terminal of said filtering circuit is connected with said VGA signal output interface.
Mobile phone of the present invention; Said level shifting circuit is made up of two SN74ACT08D logical AND gates and electrostatic discharge protection circuit resonant filtering circuit separately thereof; The input end of each said SN74ACT08D logical AND gate is connected with said cpu chip MCIMX31VKN5B, and the output terminal of each said SN74ACT08D logical AND gate is connected with said VGA signal output interface through its electrostatic discharge protection circuit resonant filtering circuit separately successively;
Said filtering circuit is made up of LC filtering circuit and electrostatic discharge protection circuit thereof; The input end of said LC filtering circuit is connected with said cpu chip MCIMX31VKN5B, and the output terminal of said LC filtering circuit is connected with said VGA signal output interface through its electrostatic discharge protection circuit.
On the other hand, the present invention also provides a kind of interface convertor, comprises USBMINII/O interface and standard VGA interface, and said USBMINII/O interface is connected with said standard VGA interface through data line.
Interface convertor of the present invention, said USBMINII/O interface are one of USBMINI10PI/O interface, USBMINI8PI/O interface or USBMINI12PI/O interface.
On the one hand, the present invention also provides a kind of method of mobile phone outputting VGA signal, may further comprise the steps again:
S1), the central processing unit of mobile phone is delivered to the video and the VGA scrambler of mobile phone, said video of initialization and VGA scrambler with reset signal, clock signal and I2C control signal;
S2), whether said video and VGA scrambler detection of handset under the control of said central processing unit is circumscribed with display, and testing result is delivered to said central processing unit, if be circumscribed with display, then execution in step 3, otherwise, execution in step 6;
S3), said central processing unit transmits digital tricolor signal and digital synchronization signal to said video and VGA scrambler; Said video and VGA scrambler become simulation tricolor signal and analogue synchronization signal with said digital tricolor signal with the digital synchronization signal corresponding conversion, and said simulation tricolor signal and analogue synchronization signal are delivered to the VGA match circuit of said mobile phone;
S4), said VGA match circuit carries out level conversion, impedance matching and Filtering Processing with said simulation tricolor signal and analogue synchronization signal; Generate the VGA signal, and said VGA signal is delivered to the interface convertor that docks with said VGA signal output interface through the VGA signal output interface of said mobile phone;
S5), said interface convertor is delivered to display with said VGA signal;
S6), said central processing unit selects said video of signal at stop and VGA scrambler to said video and VGA scrambler transmission sheet.
Have additional video and VGA scrambler, VGA match circuit and VGA signal output interface in the mobile phone of the present invention; The digital tricolor signal of the central processing unit output of this mobile phone becomes the VGA signal after video and VGA scrambler and the processing of VGA match circuit; Again through the VGA signal output interface with the external interface convertor of this mobile phone with the display that the VGA signal is delivered to interface convertor is connected on; Thereby realized the mobile phone outputting VGA signal; Content displayed can be placed on the external display device to be shown; Make the user can carry heavy notebook computer, as long as, improved the efficient of mobile office just can have the personage who needs to do demonstration on the equipment such as projector that the standard VGA interface is arranged, for easily client or other with this mobile phone and interface convertor.
Description of drawings
Fig. 1 is the part-structure block diagram of mobile phone of the present invention;
Fig. 2 is the synoptic diagram that is electrically connected of the cpu chip MCIMX31VKN5B of mobile phone of the present invention and VGA coding chip CHRONTEL CH7026;
Fig. 3 is the VGA coding chip CHRONTEL CH7026 of mobile phone of the present invention and the circuit theory diagrams of peripheral circuit thereof;
Fig. 4 is the circuit theory diagrams of the VGA match circuit of mobile phone of the present invention;
Fig. 5 is the circuit theory diagrams of the USBMINI10PI/O interface of mobile phone of the present invention;
Fig. 6 is the circuit theory diagrams of the USBMINI8PI/O interface of mobile phone of the present invention;
Fig. 7 is the circuit theory diagrams of the USBMINI12PI/O interface of mobile phone of the present invention;
Fig. 8 is the circuit theory diagrams of the power circuit of mobile phone of the present invention;
Fig. 9 is the circuit theory diagrams of interface convertor of the present invention;
Figure 10 is the method flow diagram of mobile phone outputting VGA signal of the present invention.
Embodiment
Be described in detail below in conjunction with the accompanying drawing specific embodiments of the invention:
With reference to figure 1; Mobile phone of the present invention; Comprise central processing unit 1, LCD (Liquid Crystal Display, LCDs) 2, power management module 3 and power circuit 7, wherein; Central processing unit 1 is used for transmitting digital tricolor signal to LCD 2, and transmits the power supply steering order to power management module 3.Power management module 3 is used for the state according to power supply steering order control power circuit 7, and gives central processing unit 1 with the feedback of status of power circuit 7.Power circuit 7 is used for respectively to central processing unit 1 and LCD 2 power supplies.
Mobile phone of the present invention also comprises video and VGA scrambler 4, VGA match circuit 5 and VGA signal output interface 6.Wherein, Video and VGA scrambler 4 are used for whether detection of handset is circumscribed with display under the control of central processing unit 1; If be circumscribed with display, then receive the digital tricolor signal that central processing unit 1 transmits, and convert digital tricolor signal to the simulation tricolor signal.VGA match circuit 5 is used for the simulation tricolor signal is matched to the VGA signal.VGA signal output interface 6 is used for the VGA signal is exported.And power circuit 7 is respectively to video and VGA scrambler 4, VGA match circuit 5 and 6 power supplies of VGA signal output interface.
Concrete, the central processing unit 1 of above-mentioned mobile phone is sent to video and VGA scrambler 4 with reset signal, clock signal and I2C control signal, initialization video and VGA scrambler 4;
Video and VGA scrambler 4 send the I2C control signal to VGA match circuit 5;
VGA signal output interface 6 sends testing result to VGA match circuit 5;
Video and VGA scrambler 4 send testing result to central processing unit 1;
When VGA signal output interface 6 is circumscribed with display; Central processing unit 1 transmits digital tricolor signal and digital synchronization signal to video and VGA scrambler 4; Otherwise central processing unit 1 selects signal at stop video and VGA scrambler 4 to video and VGA scrambler 4 transmission sheets;
Video and VGA scrambler 4 become simulation tricolor signal and analogue synchronization signal with digital tricolor signal with the digital synchronization signal corresponding conversion, and will simulate tricolor signal and analogue synchronization signal is delivered to VGA match circuit 5;
VGA signal output interface 6 is exported the VGA signal.
Referring to figs. 2 and 3, in the present embodiment, the central processing unit of mobile phone of the present invention adopts cpu chip MCIMX31VKN5BU1, and the video of mobile phone of the present invention and VGA scrambler adopt CHRONTEL CH7026U12 and peripheral circuit thereof.Wherein, the P21 pin of cpu chip MCIMX31VKN5B U1 is connected with the 6th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting reset signal.The N20 pin of cpu chip MCIMX31VKN5B U1 is connected with the 80th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting chip selection signal.The N21 pin of cpu chip MCIMX31VKN5B U1 is connected with the 50th pin of VGA coding chip CHRONTEL CH7026U12, is used for the transmission clock signal.The R26 pin of cpu chip MCIMX31VKN5BU1 is connected with the 79th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting synchronizing signal MONVSYNC.The N25 pin of cpu chip MCIMX31VKN5B U1 is connected with the 78th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting synchronizing signal MONHSYNC.The H25 pin of cpu chip MCIMX31VKN5B U1 is connected with the 38th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting the I2C_DATA control signal.The J24 pin of cpu chip MCIMX31VKN5B U1 is connected with the 39th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting the I2C_CLK control signal.The V20 pin of cpu chip MCIMX31VKN5B U1, AA26 pin, W24 pin, AA25 pin, V21 pin, Y26 pin are corresponding successively to be connected with the 75th pin, the 74th pin, the 73rd pin, the 72nd pin, the 71st pin, the 70th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting the digital red original signal.The Y25 pin of cpu chip MCIMX31VKN5B U1, V24 pin, W26 pin, U21 pin, W25 pin, U24 pin are corresponding successively to be connected with the 65th pin, the 64th pin, the 63rd pin, the 62nd pin, the 61st pin, the 60th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting digital green original signal.The V26 pin of cpu chip MCIMX31VKN5B U1, T20 pin, V25 pin, T21 pin, U26 pin, T24 pin are corresponding successively to be connected with the 57th pin, the 56th pin, the 55th pin, the 54th pin, the 53rd pin and the 52nd pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting digital blue original signal.
With reference to figure 4, the VGA match circuit of mobile phone of the present invention further comprises level shifting circuit 51, impedance matching circuit 52 and filtering circuit 53.Wherein, level shifting circuit 51 comprises two SN74ACT08D logical AND gate U16A and U16B and electrostatic discharge protection circuit resonant filtering circuit separately thereof.The 1st of SN74ACT08D logical AND gate U16A is connected with the 2nd pin of the 2nd pin with VGA coding chip CHRONTEL CH7026U12; The 4th of SN74ACT08D logical AND gate U16B is connected with the 1st pin of the 5th pin with VGA coding chip CHRONTEL CH7026U12; The 3rd pin of SN74ACT08D logical AND gate U16A is connected with the VGA signal output interface through electrostatic discharge protection circuit (diode D16) the resonant filtering circuit (inductance L 39 and capacitor C 338) of self successively; Be used for transmitting the analogue synchronization signal MONHSYNC of the requirement that meets the VGA signal to this VGA signal output interface; The 6th pin of SN74ACT08D logical AND gate U16B is connected with the VGA signal output interface through electrostatic discharge protection circuit (diode D17) the resonant filtering circuit (inductance L 38 and capacitor C 339) of self successively, is used for transmitting to this VGA signal output interface the analogue synchronization signal MONVSYNC of the requirement that meets the VGA signal.Above-mentioned level shifting circuit 51 change-over circuits are used for converting the 3.3V analogue synchronization signal to the 5V analogue synchronization signal to meet the requirement of VGA signal.
With reference to figure 4, the impedance matching circuit 52 of mobile phone of the present invention is made up of resistance R 219, R220 and R221, wherein; One end of resistance R 219 is connected with the 25th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting the analog blue original signal, its other end ground connection; One end of resistance R 221 is connected with the 27th pin of VGA coding chip CHRONTEL CH7026U12; Be used for transmitting the green original signal of simulation, its other end ground connection, an end of resistance R 220 is connected with the 29th pin of VGA coding chip CHRONTELCH7026U12; Be used for transmitting the analog red original signal, its other end ground connection.
With reference to figure 4, the filtering circuit 53 of mobile phone of the present invention comprises a LC filtering circuit (capacitor C 340, inductance L 44, capacitor C 341, inductance L 43, capacitor C 351) and electrostatic discharge protection circuit (diode D10), the 2nd LC filtering circuit (capacitor C 352, inductance L 36, capacitor C 353, inductance L 37, capacitor C 354) and electrostatic discharge protection circuit (diode D11) thereof and the 3rd LC filtering circuit (capacitor C 355, inductance L 45, capacitor C 356, inductance L 46, capacitor C 357) and electrostatic discharge protection circuit (diode D12) thereof.Wherein, The input end of the one LC filtering circuit is connected with the 29th pin of VGA coding chip CHRONTEL CH7026U12; Be used for transmitting the analog red original signal, its output terminal is connected with the VGA signal output interface, is used for transmitting the analog red original signal that meets the VGA standard.The input end of the 2nd LC filtering circuit is connected with the 27th pin of VGA coding chip CHRONTEL CH7026U12, is used for transmitting the green original signal of simulation, and its output terminal is connected with the VGA signal output interface, is used for transmitting the green original signal of the simulation that meets the VGA standard.The input end of the 3rd LC filtering circuit is connected with the 25th pin of VGA coding chip CHRONTELCH7026U12, is used for transmitting the analog blue original signal, and its output terminal is connected with the VGA signal output interface, is used for transmitting the analog blue original signal that meets the VGA standard.
With reference to figure 5, the VGA signal output interface of mobile phone of the present invention is specially the USBMINI10PI/O interface.Wherein, The 2nd pin of USBMINI10PI/O interface 6a connects the USB_5V_IN end (when mobile phone does not use VGA signal output function through a LC filtering circuit; The USB_5V_IN end can be used as general VGA signal output interface and uses); The 4th pin of USBMINI10PI/O interface connects the USB_OTG_D_MINUS end; The 6th pin of USBMINI10PI/O interface 6a connects the USB_OTG_D_PLUS end; The 8th pin of USBMINI10PI/O interface 6a connects the USB_OTG_D_UID end; The 1st pin of USBMINI10PI/O interface 6a is connected with the MONHSYNC output terminal (see figure 4) of the VGA match circuit of mobile phone of the present invention; The 3rd pin of USBMINI10PI/O interface 6a is connected with the MONVSYNC output terminal (see figure 4) of the VGA match circuit of mobile phone of the present invention; The 5th pin of USBMINI10PI/O interface 6a is connected with the MONRED output terminal (see figure 4) of the VGA match circuit of mobile phone of the present invention, and the 7th pin of USBMINI10PI/O interface 6a is connected with the MONGREEN output terminal (see figure 4) of the VGA match circuit of mobile phone of the present invention, and the 9th pin of USBMINI10PI/O interface 6a is connected with the MONBLUE output terminal (see figure 4) of the VGA match circuit of mobile phone of the present invention; The 10th pin of USBMINI10PI/O interface 6a, the 11st pin, the 12nd pin, the 13rd pin and the 14th pin ground connection, the 15th pin of USBMINI10PI/O interface 6a and the 16th pin is unsettled need not.
With reference to figure 6, in another embodiment of the present invention, the VGA signal output interface of mobile phone of the present invention can be USBMINI8PI/O interface 6b.Wherein, The 2nd pin of USBMINI8PI/O interface 6b is connected with the MONHSYNC output terminal of the VGA match circuit of mobile phone of the present invention; The 3rd pin of USBMINI8PI/O interface 6b is connected with the MONVSYNC output terminal of the VGA match circuit of mobile phone of the present invention; The 5th pin of USBMINI8PI/O interface 6b is connected with the MONRED output terminal of the VGA match circuit of mobile phone of the present invention; The 6th pin of USBMINI8PI/O interface 6b is connected with the MONGREEN output terminal of the VGA match circuit of mobile phone of the present invention; The 7th pin of USBMINI8PI/O interface 6b is connected with the MONBLUE output terminal of the VGA match circuit of mobile phone of the present invention; The 1st pin of USBMINI8PI/O interface 6b, the 4th pin, the 8th pin, the 9th pin, the 11st pin and the 12nd pin pin ground connection, the 13rd pin of USBMINI8PI/O interface 6b and the 14th the pipe unsettled need not.
With reference to figure 7, in another embodiment of the present invention, the VGA signal output interface of mobile phone of the present invention can be USBMINI12PI/O interface 6c.Wherein, The 2nd pin of USBMINI12PI/O interface 6c is connected with the MONHSYNC output terminal of the VGA match circuit of mobile phone of the present invention; The 3rd pin of USBMINI12PI/O interface 6c is connected with the MONVSYNC output terminal of the VGA match circuit of mobile phone of the present invention; The 5th pin of USBMINI12PI/O interface 6c is connected with the MONRED output terminal of the VGA match circuit of mobile phone of the present invention; The 6th pin of USBMINI12PI/O interface 6c is connected with the MONGREEN output terminal of the VGA match circuit of mobile phone of the present invention; The 7th pin of USBMINI12PI/O interface 6c is connected with the MONBLUE output terminal of the VGA match circuit of mobile phone of the present invention, the 1st pin of USBMINI12PI/O interface 6c, the 4th pin, the 8th pin, the 9th pin, the 10th pin, the 11st pin, the 12nd pin, the 13rd pin, the 14th pin, the 15th pin and the 16th pin pin ground connection.
The VGA signal output interface of the mobile phone of the invention described above is and adopts wired output interface; It will be appreciated by those skilled in the art that; The VGA signal output interface of mobile phone of the present invention also can adopt wireless output interface; Realize like wave points such as blue tooth interface, WIFI (WirelessFidelity, Wireless Fidelity) interface or WIMAX (World Interoperability for Microwave Access, World Interoperability for Microwave Access, WiMax) interfaces.
With reference to figure 8, the power circuit of mobile phone of the present invention comprises the first power circuit 7a, second source circuit 7b, the 3rd power circuit 7c, the 4th power circuit 7d, the 5th power circuit 7e, the 6th power circuit 7f and the 7th power circuit 7g.Wherein, the input end of the first power circuit 7a is EXT_3V3, and its output terminal is connected with the 8th pin, the 12nd pin, the 37th pin and the 49th pin of VGA coding chip CHRONTEL CH7026U12 respectively.The input end of second source circuit 7b is EXT_3V3, and its output terminal is connected with the 51st pin of VGA coding chip CHRONTEL CH7026U12.The input end of the 3rd power circuit 7c is EXT_3V3, and the electrostatic discharge protection circuit of filtering circuit 53 is connected (see figure 4) in the 28th pin of its output terminal and VGA coding chip CHRONTEL CH7026U12 and the VGA match circuit.The input end of the 4th power circuit 7d is 5V_5BOOST, and the electrostatic discharge protection circuit of level shifting circuit 51 is connected (see figure 4) in its output terminal and the VGA match circuit.The input end of the 5th power circuit 7e is VCC_2V5, and its output terminal is connected with the 14th pin, the 44th pin and the 45th pin of VGA coding chip CHRONTEL CH7026U12.The input end of the 6th power circuit 7f is VCC_2V5, and its output terminal is connected with the 18th pin with the 10th pin of VGA coding chip CHRONTEL CH7026U12 respectively.The input end of the 7th power circuit 7g is EXT_1V8, and its output terminal is connected with the 33rd pin of VGA coding chip CHRONTEL CH7026U12.
With reference to figure 9, interface convertor of the present invention comprises USBMINI10PI/O interface 91 and standard VGA interface 92.Wherein, USBMINI10PI/O interface 91 is connected with standard VGA interface 92 through data line.Interface convertor of the present invention and the supporting use of mobile phone of the present invention realize that mobile phone is connected with the communication of the display device that has the VGA input interface such as computer, projector etc., thereby the VGA signal of mobile phone output is delivered to these equipment.Wherein, The 5th pin of USBMINI10PI/O interface 91 is connected with the 1st pin of standard VGA interface 92; The 7th pin of USBMINI10PI/O interface 91 is connected with the 2nd pin of standard VGA interface 92; The 9th pin of USBMINI10PI/O interface 91 is connected with the 3rd pin of standard VGA interface 92; The 1st pin of USBMINI10PI/O interface 91 is connected with the 13rd pin of standard VGA interface 92; The 3rd pin of USBMINI10PI/O interface 91 is connected with the 14th pin of standard VGA interface 92, the 10th pin of USBMINI10PI/O interface 91, the 11st pin, the 12nd pin, the 13rd pin and the 14th pin ground connection, the 15th pin of USBMINI10PI/O interface 91 and the 16th pin is unsettled need not.And the 5th pin of standard VGA interface 92, the 6th pin, the 7th pin, the 8th pin, the 10th pin and its earthing of casing, the 4th pin of standard VGA interface 92, the 9th pin, the 11st pin, the 12nd pin and the 15th pin is unsettled need not.
Certainly; The present invention does not limit the type of the USBMINII/O interface of interface convertor; If the VGA signal output interface of mobile phone of the present invention is the USBMINI8PI/O interface, then the USBMINII/O interface of corresponding interface convertor also should be the USBMINI8PI/O interface, and it is similar with being connected of standard VGA interface with the USBMINI8PI/O interface with being connected of standard VGA interface; Repeat no more at this; In like manner, if the VGA signal output interface of mobile phone of the present invention is the USBMINI12PI/O interface, then the USBMINII/O interface of corresponding interface convertor also should be the USBMINI12PI/O interface.
With reference to Figure 10, the method for a kind of mobile phone outputting VGA signal of the present invention specifically may further comprise the steps:
Step S1, the central processing unit of mobile phone deliver to reset signal, clock signal and I2C control signal video and VGA scrambler, initialization video and the VGA scrambler of mobile phone.
Step S2, whether said video and VGA scrambler detection of handset under the control of central processing unit is circumscribed with display, and testing result is delivered to central processing unit, if be circumscribed with display, execution in step S3 then, otherwise, execution in step S6.
Step S3, central processing unit transmit digital tricolor signal and digital synchronization signal to video and VGA scrambler; Video and VGA scrambler become simulation tricolor signal and analogue synchronization signal with digital tricolor signal with the digital synchronization signal corresponding conversion, and will state the VGA match circuit that simulation tricolor signal and analogue synchronization signal are delivered to mobile phone.
Step S4, VGA match circuit will simulate tricolor signal and analogue synchronization signal carries out level conversion, impedance matching and Filtering Processing; Generate the VGA signal, and the VGA signal is delivered to the interface convertor that docks with the VGA signal output interface through the VGA signal output interface of mobile phone.
Step S5, interface convertor are delivered to display with the VGA signal.
Step S6, central processing unit select signal at stop video and VGA scrambler to video and VGA scrambler transmission sheet.
Have additional video and VGA scrambler, VGA match circuit and VGA signal output interface in the mobile phone of the present invention; The digital tricolor signal of the central processing unit output of this mobile phone becomes the VGA signal after video and VGA scrambler and the processing of VGA match circuit; Again through the VGA signal output interface with the external interface convertor of this mobile phone with the display that the VGA signal is delivered to interface convertor is connected on; Thereby realized the mobile phone outputting VGA signal; Content displayed can be placed on the external display device to be shown; Make the user can carry heavy notebook computer, as long as, improved the efficient of mobile office just can have the personage who needs to do demonstration on the equipment such as projector that the standard VGA interface is arranged, for easily client or other with this mobile phone and interface convertor.
Above embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (5)
1. a mobile phone comprises central processing unit, LCD, power management module and power circuit;
Said central processing unit is used for transmitting digital tricolor signal to said LCD, and transmits the power supply steering order to said power management module;
Said power management module is used for controlling according to said power supply steering order the state of said power circuit, and gives said central processing unit with the feedback of status of said power circuit;
Said power circuit is used for respectively to said central processing unit and said LCD power supply;
It is characterized in that said mobile phone also comprises video and VGA scrambler, VGA match circuit and VGA signal output interface;
Said video and VGA scrambler are used under the control of said central processing unit, detecting said mobile phone and whether are circumscribed with display; If be circumscribed with display; Then receive the digital tricolor signal that said central processing unit transmits, and convert said digital tricolor signal to the simulation tricolor signal;
Said VGA match circuit is used for said simulation tricolor signal is matched to the VGA signal;
Said VGA signal output interface is used for said VGA signal output;
Said power circuit is respectively to said video and VGA scrambler, VGA match circuit and the power supply of VGA signal output interface; Wherein, the VGA signal output interface is one of USBMINI10P I/O interface, USBMINI8P I/O interface, USBMINI12P I/O interface, blue tooth interface, WIFI interface, WIMAX interface;
Said central processing unit is made up of cpu chip MCIMX31VKN5B and peripheral circuit thereof, and said video and VGA scrambler are made up of VGA coding chip CHRONTEL CH7026 and peripheral circuit thereof; The P21 pin of said cpu chip MCIMX31VKN5B; The N20 pin; The N21 pin; The R26 pin; The N25 pin; The H25 pin; The J24 pin; The V20 pin; The AA26 pin; The W24 pin; The AA25 pin; The V21 pin; The Y26 pin; The Y25 pin; The V24 pin; The W26 pin; The U21 pin; The W25 pin; Pin; The U24 pin; The V26 pin; The T20 pin; The V25 pin; The T21 pin; Corresponding successively the 6th pin with said VGA coding chip CHRONTEL CH7026 of U26 pin and T24 pin; The 80th pin; The 50th pin; The 79th pin; The 78th pin; The 38th pin; The 39th pin; The 75th pin; The 74th pin; The 73rd pin; The 72nd pin; The 71st pin; The 70th pin; The 65th pin; The 64th pin; The 63rd pin; The 62nd pin; The 61st pin; The 60th pin; The 57th pin; The 56th pin; The 55th pin; The 54th pin; The 53rd pin is connected with the 52nd pin.
2. mobile phone according to claim 1 is characterized in that, said video and VGA scrambler detect said mobile phone and whether be circumscribed with display under the control of said central processing unit, comprising:
Said central processing unit is sent to said video and VGA scrambler with reset signal, clock signal and I2C control signal, said video of initialization and VGA scrambler,
Said video and VGA scrambler send said I2C control signal to said VGA match circuit,
Said VGA match circuit sends said I2C control signal to said VGA signal output interface,
Said VGA signal output interface sends testing result to said VGA match circuit,
Said VGA match circuit sends said testing result to said video and VGA scrambler,
Said video and VGA scrambler send said testing result to said central processing unit;
Said video and VGA scrambler receive the digital tricolor signal that said central processing unit transmits, and convert said digital tricolor signal to the simulation tricolor signal, comprising:
Said video receives digital tricolor signal with the VGA scrambler and becomes simulation tricolor signal and analogue synchronization signal with digital synchronization signal and with said digital tricolor signal with the digital synchronization signal corresponding conversion, and said simulation tricolor signal and analogue synchronization signal are delivered to said VGA match circuit;
Said VGA match circuit is used for said simulation tricolor signal is matched to the VGA signal, comprising:
Said VGA match circuit carries out level conversion, impedance matching and Filtering Processing with said simulation tricolor signal and analogue synchronization signal, generates said VGA signal.
3. mobile phone according to claim 2 is characterized in that, said VGA match circuit comprises level shifting circuit, impedance matching circuit and filtering circuit;
The input end of said level shifting circuit is connected with said cpu chip MCIMX31VKN5B, and the output terminal of said level shifting circuit is connected with said VGA signal output interface;
The input end of said impedance matching circuit is connected the output head grounding of said impedance matching circuit with said cpu chip MCIMX31VKN5B;
The input end of said filtering circuit is connected with said cpu chip MCIMX31VKN5B, and the output terminal of said filtering circuit is connected with said VGA signal output interface.
4. mobile phone according to claim 3; It is characterized in that; Said level shifting circuit is made up of two SN74ACT08D logical AND gates and electrostatic discharge protection circuit resonant filtering circuit separately thereof; The input end of each said SN74ACT08D logical AND gate is connected with said cpu chip MCIMX31VKN5B, and the output terminal of each said SN74ACT08D logical AND gate is connected with said VGA signal output interface through its electrostatic discharge protection circuit resonant filtering circuit separately successively;
Said filtering circuit is made up of LC filtering circuit and electrostatic discharge protection circuit thereof; The input end of said LC filtering circuit is connected with said cpu chip MCIMX31VKN5B, and the output terminal of said LC filtering circuit is connected with said VGA signal output interface through its electrostatic discharge protection circuit.
5. a method that is applied to the mobile phone outputting VGA signal of claim 1 is characterized in that, may further comprise the steps:
S1), the central processing unit of mobile phone is delivered to the video and the VGA scrambler of mobile phone, said video of initialization and VGA scrambler with reset signal, clock signal and I2C control signal;
S2), whether said video and VGA scrambler detection of handset under the control of said central processing unit is circumscribed with display, and testing result is delivered to said central processing unit, if be circumscribed with display, then execution in step 3, otherwise, execution in step 6;
S3), said central processing unit transmits digital tricolor signal and digital synchronization signal to said video and VGA scrambler; Said video and VGA scrambler become simulation tricolor signal and analogue synchronization signal with said digital tricolor signal with the digital synchronization signal corresponding conversion, and said simulation tricolor signal and analogue synchronization signal are delivered to the VGA match circuit of said mobile phone;
S4), said VGA match circuit carries out level conversion, impedance matching and Filtering Processing with said simulation tricolor signal and analogue synchronization signal; Generate the VGA signal, and said VGA signal is delivered to the interface convertor that docks with said VGA signal output interface through the VGA signal output interface of said mobile phone;
S5), said interface convertor is delivered to display with said VGA signal;
S6), said central processing unit selects said video of signal at stop and VGA scrambler to said video and VGA scrambler transmission sheet.
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| TWI490850B (en) * | 2013-08-02 | 2015-07-01 | Univ Asia | Large dynamic tiled display system and method thereof |
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| CN101882056B (en) * | 2010-06-29 | 2012-05-23 | 中国联合网络通信集团有限公司 | iPhone large screen touch system and debugging method thereof |
| CN102333215A (en) * | 2011-09-15 | 2012-01-25 | 盛乐信息技术（上海）有限公司 | Handheld mobile device and method interactive with projection apparatus |
| CN102436797A (en) * | 2011-12-30 | 2012-05-02 | 福建省冠林科技有限公司 | Digital TFT (thin film transistor) screen driver board circuit of video intercom system |
| CN104571996A (en) * | 2015-01-05 | 2015-04-29 | 山东超越数控电子有限公司 | Domestically-produced computer platform based split-screen achievement method |
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| CN201191892Y (en) * | 2008-04-01 | 2009-02-04 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal |
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| CN201191892Y (en) * | 2008-04-01 | 2009-02-04 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal |
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| TWI490850B (en) * | 2013-08-02 | 2015-07-01 | Univ Asia | Large dynamic tiled display system and method thereof |
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