CN201215981Y - Control circuit and television having the control circuit - Google Patents
Control circuit and television having the control circuit Download PDFInfo
- Publication number
- CN201215981Y CN201215981Y CNU2008200238607U CN200820023860U CN201215981Y CN 201215981 Y CN201215981 Y CN 201215981Y CN U2008200238607 U CNU2008200238607 U CN U2008200238607U CN 200820023860 U CN200820023860 U CN 200820023860U CN 201215981 Y CN201215981 Y CN 201215981Y
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- CN
- China
- Prior art keywords
- signal port
- hdmi
- hdmi signal
- control switch
- main control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a control circuit and a television with the control circuit, which comprise an HDMI signal port and a main control chip which is connected with the HDMI signal port, and also comprises a control switch circuit, wherein a control switch can be an NPN triode or an N channel MOS tube, an output signal of a feedback signal pin is controlled by the control switch, the control switch is controlled by an IO port of the main control chip, when an HDMI source device and a receiving device have data transmission abnormity, system software can pull down the feedback signal pin through IO control, thereby triggering the HDMI source device to start data recognition and transmission process again. Furthermore, the control circuit and the television have simple structure, low cost and ingenious concept, and are suitable for large scale expansion and application.
Description
Technical field
The utility model relates to the TV set circuit technical field, specifically, relates in particular to a kind of control circuit and has the television set of described control circuit.
Background technology
HDMI uses digital audio/video external terminal very widely at present, especially television set must possess external terminal, and the HDMI agreement is supported in a cable transmission digital video and audio signal simultaneously, has very high signal bandwidth, and supporting the hot plug function, is the transmit port of plug and play.In working order, the HDMI source device is after DDC and TMDS signal are ready, and source output terminal promptly provides+the 5V power supply signal.The receiving equipment end is ready to should give HPD (Hot Plug Detect) a high level (Min2.4V after the E-EDID data, Max5.3V) (this high level just often keeps in transfer of data always, if the step-down source device is thought no receiving equipment), after then the source end is received the HPD high level signal, begin to read the E-EDID data of receiving terminal, transmit the audio, video data form that receiving equipment is supported subsequently.
The common practice of receiving equipment is to link together by a resistance handle+5V Power and HPD at present, this is not a good mode, because this is equivalent to state at the source end+5V after, receiving terminal has provided the effective high level of HPD immediately, but at this moment receiving equipment may not be ready to, it is undesired to cause source end and receiving terminal to transmit data, and occurs also effectively not recovering controlling mechanism after the mistake for transfer of data.
The utility model content
Main purpose of the present utility model provides a kind of control response circuit of HDMI signal, does not have under the situation of bigger change by increasing local circuit and software, has solved the fast quick-recovery problem of HDMI signal transmission abnormality.Make at HDMI receiving equipments such as television sets and can receive high-quality digital audio-video signal by the HDMI port reliably.
The utility model adopts following technical scheme to realize goal of the invention:
A kind of control circuit comprises HDMI signal port and the main control chip that is connected with the HDMI signal port, in addition, also comprises the control switch circuit, and described control switch circuit is connected with described main control chip with described HDMI signal port respectively.
Preferably, described control switch circuit comprises NPN type triode, and the base stage of described NPN type triode connects described main control chip, and collector electrode connects the interface pin of HDMI signal port, grounded emitter.The HDMI signal port comprises power pins and feedback signal pin, is connected to the collector electrode of described NPN type triode after described two pins serial connection.
According to another embodiment of the present utility model, described control switch circuit comprises the N-channel MOS pipe, and the grid of described N-channel MOS connects described main control chip, and drain electrode connects the interface pin of HDMI signal port, source ground respectively.The HDMI signal port comprises power pins and feedback signal pin, is connected to the drain electrode of described N-channel MOS after described two pins serial connection.
Another one technical scheme of the present utility model is: a kind of television set, comprise HDMI signal port and the main control chip that is connected with the HDMI signal port, in addition, also comprise the control switch circuit, described control switch circuit is connected with described main control chip with described HDMI signal port respectively.
Preferably, described control switch circuit comprises NPN type triode, and the base stage of described NPN type triode connects described main control chip, and collector electrode connects the interface pin of HDMI signal port, grounded emitter.The HDMI signal port comprises power pins and feedback signal pin, is connected to the collector electrode of described NPN type triode after described two pins serial connection.
According to another embodiment of the present utility model, described control switch circuit comprises the N-channel MOS pipe, and the grid of described N-channel MOS connects described main control chip, and drain electrode connects the interface pin of HDMI signal port, source ground respectively.The HDMI signal port comprises power pins and feedback signal pin, is connected to the drain electrode of described N-channel MOS after described two pins serial connection.
Compared with the prior art, advantage of the present utility model with good effect is: the utility model with the feedback signal pin of receiving equipment except with the power supply signal pin is connected, also connect control switch, control switch can be NPN type triode or N-channel MOS pipe, output signal by control switch Control and Feedback signal pins, control switch is by an IO mouth control of main control chip, when between HDMI source device and receiving equipment, data transmission exception occurring like this, systems soft ware can be drop-down to the feedback signal pin by IO control, thereby trigger identification and the transmission course that the HDMI source device restarts data.In addition, the utility model is simple in structure, and is with low cost, is skillfully constructed, and is fit to large-scale promotion application.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model preferred embodiment.
Fig. 2 is the HDMI source device and the receiving equipment syndeton schematic diagram of the utility model preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the utility model is done further to describe in detail.These accompanying drawings are the schematic diagram of simplification, basic structure of the present utility model only is described in a schematic way, so it only show the formation relevant with the utility model.
The utility model with the feedback signal pin of receiving equipment except with the power supply signal pin is connected, also connect control switch, output signal by control switch Control and Feedback signal pins, control switch is by an IO mouth control of main control chip, when between HDMI source device and receiving equipment, data transmission exception occurring like this, systems soft ware can come the Control and Feedback signal by IO, thereby triggers identification and transmission course that the HDMI source device restarts data.
In order to save television set complete machine cost, simplify circuit structure, the utility model adopts the described control switch circuit of discrete component assembly, and its circuit structure is referring to Fig. 1, Fig. 2.
The HDMI source device is the HDMI port with exact function definition with being connected of receiving equipment, as shown in Figure 1, comprise data-signal (TMDS), communication signal and handshake, data-signal is connected the main control chip of source device and receiving equipment with communication signal, data-signal transmits the minimum differential signal (TMDS) that comprises audio-video frequency content, and communication signal is responsible for information interchange and protocol validation.Up-to-date agreement is HDMI1.3 at present.
Referring to Fig. 2, the utility model comprises HDMI signal source equipment, HDMI signal receiver, control switch circuit and main control chip, the main control chip of this preferred embodiment can be MCU, it also can be the SOC processor, GPIO_HPT is the IO mouth control signal by system for TV set CPU output, HDMI5V is the 5V signal of HDMI source device output, and HOTPLUG is the feedback signal that outputs to the HDMI port.Described control switch is NPN type triode Q1 or P channel MOS tube, Figure 1 shows that and adopt the physical circuit annexation of NPN type triode as switch element, the base stage of triode Q1 connects the GPIO_HPT pin of CPU by divider resistance R1, collector electrode connects the 5V power pins of HDMI port by divider resistance R2, the HOTPLUG pin that also connects the HDMI port simultaneously, grounded emitter.
The operation principle of this circuit is: generally HDMI5V and HOTPLUG can support the handshake procedure of normal HDMI equipment room, carrying out the Control Software of the transfer of data .CPU between normal HDMI source device and the receiving equipment subsequently also can monitor this process, in signal normal transmission process HOTPLUG as feedback signal always for high level. when the signal transmission occurs normally shaking hands or Control Software detects when occurring situation such as unusual in the data transmission procedure, GPIO_HPT provides high level pulse by system software controls, triode Q1 conducting, control HOTPLUG give low level pulse of source device, this moment, the HDMI source device just thought there has not been receiving equipment, thereby stop the transmission of data, main control chip control simultaneously triggers the identification again and the transfer of data of HDMI equipment room.
The utility model is not only applicable to technical field of television sets, be applicable to that also all have the audio ﹠ video equipment of HDMI transfer of data, in addition, should be appreciated that, foregoing description only is in order to set forth the utility model, and those skilled in the art can make multiple replacement form and modification not breaking away under the situation of the present utility model.Therefore, the utility model is intended to all these replacement forms, the modification modification is included in the protection range of the present utility model.
Claims (10)
1, a kind of control circuit comprises HDMI signal port and the main control chip that is connected with the HDMI signal port, and it is characterized in that: also comprise the control switch circuit, described control switch circuit is connected with described main control chip with described HDMI signal port respectively.
2, control circuit according to claim 1, it is characterized in that: described control switch circuit comprises NPN type triode Q1, the base stage of described NPN type triode connects described main control chip, and collector electrode connects the interface pin of HDMI signal port, grounded emitter.
3, control circuit according to claim 2 is characterized in that: described HDMI signal port comprises power pins and feedback signal pin, is connected to the collector electrode of described NPN type triode after described two pins serial connection.
4, control circuit according to claim 1 is characterized in that: described control switch circuit comprises the N-channel MOS pipe, and the grid of described N-channel MOS connects described main control chip, and drain electrode connects the interface pin of HDMI signal port, source ground.
5, control circuit according to claim 4 is characterized in that: described HDMI signal port comprises power pins and feedback signal pin, is connected to the drain electrode of described N-channel MOS pipe after described two pins serial connection.
6, a kind of television set comprises HDMI signal port and the main control chip that is connected with the HDMI signal port, and it is characterized in that: also comprise the control switch circuit, described control switch circuit is connected with described main control chip with described HDMI signal port respectively.
7, television set according to claim 6 is characterized in that: described control switch circuit comprises NPN type triode, and the base stage of described NPN type triode connects described main control chip, and collector electrode connects the interface pin of HDMI signal port, grounded emitter.
8, television set according to claim 7 is characterized in that: described HDMI signal port comprises power pins and feedback signal pin, is connected to the collector electrode of described NPN type triode after described two pins serial connection.
9, television set according to claim 6 is characterized in that: described control switch circuit comprises the N-channel MOS pipe, and the grid of described N-channel MOS connects described main control chip, and drain electrode connects the interface pin of HDMI signal port, source ground.
10, television set according to claim 9 is characterized in that: described HDMI signal port comprises power pins and feedback signal pin, is connected to the drain electrode of described N-channel MOS after described two pins serial connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200238607U CN201215981Y (en) | 2008-06-16 | 2008-06-16 | Control circuit and television having the control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200238607U CN201215981Y (en) | 2008-06-16 | 2008-06-16 | Control circuit and television having the control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201215981Y true CN201215981Y (en) | 2009-04-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200238607U Expired - Fee Related CN201215981Y (en) | 2008-06-16 | 2008-06-16 | Control circuit and television having the control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201215981Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105635802A (en) * | 2015-12-31 | 2016-06-01 | 浙江大华技术股份有限公司 | Transmission method of digital media data and device |
| CN108233957A (en) * | 2017-12-01 | 2018-06-29 | 天地融科技股份有限公司 | Data transmission method for uplink |
| CN110493551A (en) * | 2019-09-12 | 2019-11-22 | 青岛海信电器股份有限公司 | A kind of display device, mainboard and control method |
| CN111613161A (en) * | 2020-05-19 | 2020-09-01 | 深圳Tcl数字技术有限公司 | Display data transmission method, display device and storage medium |
-
2008
- 2008-06-16 CN CNU2008200238607U patent/CN201215981Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105635802A (en) * | 2015-12-31 | 2016-06-01 | 浙江大华技术股份有限公司 | Transmission method of digital media data and device |
| CN108233957A (en) * | 2017-12-01 | 2018-06-29 | 天地融科技股份有限公司 | Data transmission method for uplink |
| CN108233957B (en) * | 2017-12-01 | 2020-06-26 | 天地融科技股份有限公司 | Data transmitting method |
| CN110493551A (en) * | 2019-09-12 | 2019-11-22 | 青岛海信电器股份有限公司 | A kind of display device, mainboard and control method |
| CN110493551B (en) * | 2019-09-12 | 2021-11-16 | 海信视像科技股份有限公司 | Display device, main board and control method |
| CN111613161A (en) * | 2020-05-19 | 2020-09-01 | 深圳Tcl数字技术有限公司 | Display data transmission method, display device and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090401 Termination date: 20120616 |