CN211481395U - Television board miniLVDS signal detection circuit and device - Google Patents
Television board miniLVDS signal detection circuit and device Download PDFInfo
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- CN211481395U CN211481395U CN202020273084.7U CN202020273084U CN211481395U CN 211481395 U CN211481395 U CN 211481395U CN 202020273084 U CN202020273084 U CN 202020273084U CN 211481395 U CN211481395 U CN 211481395U
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Abstract
A detection circuit and a device for a television board miniLVDS (mini Low-Voltage Differential Signaling) are provided, wherein a first signal conversion circuit, a second signal conversion circuit and a main control circuit are added to collect the miniLVDS of the television board to be detected, and the signals are converted into target LVTTL (Low Voltage Transistor Logic) signals and then converted into HDMI signals which are easy to identify and detect by the main control circuit, so that the main control circuit detects whether the HDMI signals are standard signals to judge whether the miniLVDS of the television board to be detected is correct, and the problems of easy misjudgment and Low efficiency caused by the adoption of a manual detection mode in the traditional technical scheme are solved.
Description
Technical Field
The application belongs to the technical field of miniLVDS signal detection, and particularly relates to a television board miniLVDS signal detection circuit and device.
Background
At present, the television board card compatible with the TCON board module generally adopts a miniLVDS interface to connect with a display screen interface, and whether a miniLVDS signal of the traditional television board card is correct or not is generally: the television board card to be tested is connected with the matched display screen, whether the miniLVDS signal of the television board card is correct or not is judged in a mode of manually judging whether the picture of the display screen is qualified or not, however, the mode of manually judging is low in efficiency, and the problem of misjudgment is easy to occur.
Therefore, the conventional technical scheme has the problems of easy misjudgment and low efficiency.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a television board miniLVDS signal detection circuit and device, and aims to solve the problems of easiness in misjudgment and low efficiency in the traditional technical scheme.
A first aspect of the embodiments of the present application provides a television board miniLVDS signal detection circuit, including:
the first signal conversion circuit is used for being connected with a miniLVDS interface of a television board to be tested and converting a miniLVDS signal of the television board to be tested into a target LVTTL signal;
the second signal conversion circuit is connected with the first signal conversion circuit and is used for converting the target LVTTL signal into an HDMI signal; and
and the master control circuit is connected with the second signal conversion circuit and is used for acquiring and detecting the HDMI signals.
In one embodiment, the first signal conversion circuit includes:
the input circuit is used for accessing the miniLVDS signal;
a switch switching circuit for generating a control signal; and
and the conversion circuit is connected with the input circuit and the switch switching circuit, and is used for converting the miniLVDS signal into a target LVTTL signal under the control of the control signal.
In one embodiment, the input circuit includes:
and the input end of the electrostatic impedor is connected with the miniLVDS interface, and the output end of the electrostatic impedor is connected with the conversion circuit.
In one embodiment, the switch switching circuit includes: and the common end of the multi-channel analog selector switch is connected with an external power supply, and each branch end of the multi-channel analog selector switch is connected with each enable end of the conversion circuit respectively.
In one embodiment, the conversion circuit comprises an FPGA XC6SLX16 chip.
In one embodiment, the second signal conversion circuit includes an IT66121FN chip.
In one embodiment, the second signal conversion circuit further comprises a microprocessor, the microprocessor is connected with the IT66121FN chip, and the microprocessor controls HDCP communication of the HDMI signal of the second signal conversion circuit.
In one embodiment, the master control circuitry comprises:
the controller is used for converting the target LVTTL signal into the HDMI signal and detecting whether the HDMI signal is a standard HDMI signal; and
the sampling control circuit, the control end of sampling control circuit with the controller is connected, the output of sampling control circuit with second signal conversion circuit connects, the sampling control circuit is used for under the control of controller, control second signal conversion circuit output the HDMI signal arrives the controller.
In one embodiment, the sampling control circuit includes: the sampling circuit comprises a first resistor, a second resistor, a third resistor and a first switching tube, wherein the first end of the first resistor and the first end of the second resistor are connected in common to serve as the input end of the sampling control circuit, the second end of the first resistor is connected with the control end of the first switching tube, the second end of the second resistor and the first end of the third resistor are connected in common to a power supply, the second end of the third resistor and the high-potential end of the first switching tube are connected in common to serve as the output end of the sampling control circuit, and the low-potential end of the first switching tube is grounded.
A second aspect of the embodiment of the present application provides a television board miniLVDS signal detection apparatus, including the television board miniLVDS signal detection circuit according to the first aspect of the embodiment of the present application.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: according to the television board miniLVDS signal detection circuit, the miniLVDS signal of the television board to be detected is collected by adding the first signal conversion circuit, the second signal conversion circuit and the main control circuit, the miniLVDS signal is converted into the target LVTTL signal and then converted into the HDMI signal which is easy to recognize and detect by the main control circuit, and therefore the main control circuit detects whether the HDMI signal is the standard HDMI signal or not so as to judge whether the miniLVDS signal of the television board to be detected is correct or not, and therefore the problems of easy misjudgment and low efficiency due to the adoption of an artificial detection mode in the traditional technical scheme are solved.
Drawings
Fig. 1 is a schematic structural circuit diagram of a television board miniLVDS signal detection circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of an example of a first signal conversion circuit in the television board miniLVDS signal detection circuit shown in fig. 1;
fig. 3 is a schematic circuit diagram of an example of a main control circuit in the television board miniLVDS signal detection circuit shown in fig. 1;
fig. 4 is an exemplary circuit schematic of the sampling control circuit in the master control circuit shown in fig. 3.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a circuit schematic diagram of a television board miniLVDS signal detection circuit provided in a preferred embodiment of the present application (fig. 1 shows a first embodiment of the present application), and for convenience of description, only the portions related to the present embodiment are shown, and the detailed description is as follows:
the television board miniLVDS signal detection circuit in this embodiment includes: the system comprises a first signal conversion circuit 100, a second signal conversion circuit 200 and a main control circuit 300, wherein the first signal conversion circuit 100 is used for being connected with a miniLVDS interface 11 of a television board card 10 to be tested, the second signal conversion circuit 200 is connected with the first signal conversion circuit 100, and the main control circuit 300 is connected with the second signal conversion circuit 200; the first signal conversion circuit 100 is configured to convert a miniLVDS signal of the television board card 10 to be tested into a target LVTTL signal; the second signal conversion circuit 200 is configured to convert the target LVTTL signal into an HDMI signal; the main control circuit 300 is used for collecting and detecting the HDMI signal.
It should be understood that the first signal conversion circuit 100 may be formed by a chip having a function of converting miniLVDS signals into LVTTL signals; the second signal conversion circuit 200 may be formed of a chip having a function of converting LVTTL signals into HDMI signals; the main control circuit 300 may be formed by a chip having functions of comparing and analyzing audio and video signals, for example, an audio and video processing chip.
The target LVTTL signal is a type of LVTTL signal that should be converted when the miniLVDS signal is received by the display screen corresponding to the television board 10 to be tested.
It should be understood that, in this embodiment, the master control circuit may compare the acquired HDMI signal with the standard HDMI signal, so as to determine whether the acquired HDMI signal is consistent with the standard HDMI signal within an allowable error value, and thus determine whether the acquired miniLVDS signal is qualified.
In the television board miniLVDS signal detection circuit in this embodiment, by adding the first signal conversion circuit 100, the second signal conversion circuit 200, and the main control circuit 300, a miniLVDS signal of the television board 10 to be detected is acquired, the miniLVDS signal is converted into a target LVTTL signal and then converted into an HDMI signal that is easily recognized and detected by the main control circuit 300, so that the main control circuit 300 detects whether the HDMI signal is a standard HDMI signal to determine whether the miniLVDS signal of the television board 10 to be detected is correct, thereby solving the problems of easy misjudgment and low efficiency due to the adoption of an artificial detection mode in the conventional technical scheme.
Referring to fig. 2, in one embodiment, the first signal conversion circuit 100 includes: the input circuit 110, the switch switching circuit 120 and the conversion circuit 130, wherein the input circuit 110 is used for being connected with the miniLVDS interface 11 of the television board card 10 to be tested, and the conversion circuit 130 is connected with the input circuit 110 and the switch switching circuit 120; the input circuit 110 is used for accessing miniLVDS signals; the switch switching circuit 120 is used for generating a control signal; the conversion circuit 130 is configured to convert the miniLVDS signal into a target LVTTL signal under the control of the control signal.
It should be understood that the miniLVDS signal is a differential pair signal, and may include two input circuits 110, each receiving one of the differential signals of the differential pair signal; when the miniLVDS signals include a miniLVDS LEFT signal and a miniLVDS RIGHT signal, two first signal conversion circuits 100 may be included to convert the miniLVDS LEFT signal and the miniLVDS RIGHT signal, respectively.
It should be understood that the input circuit 110 may be comprised of one or more of a filtering device, an anti-jamming device, etc.; the switch switching circuit 120 may be constituted by a multiplexer, a multi-channel switch, or a plurality of electronic switching devices; the conversion circuit 130 may be formed of a chip having a function of converting the miniLVDS signal into the LVTTL signal.
It should be understood that the control signal generated by the switching circuit 120 in this embodiment is a signal combined by multiple high and low levels, for example, 0001, 0010, 0100, and the like.
In one embodiment, the input circuit 110 includes: the input end of the electrostatic impeder is connected to the miniLVDS interface 11, and the output end of the electrostatic impeder is connected to the conversion circuit 130.
The electrostatic resistor in this embodiment is a PESD2510AQ1 type electrostatic resistor, but other types of electrostatic resistors may be used in other embodiments.
In one embodiment, the switch switching circuit 120 includes: the common end of the multi-channel analog selector switch is connected to the external power supply, and each branch end of the multi-channel analog selector switch is connected to each enable end of the conversion circuit 130.
It should be understood that the switch switching circuit 120 in other embodiments may also be constituted by a dial switch.
In one embodiment, the translation circuit 130 includes an FPGA XC6SLX16 chip.
In one embodiment, the second signal conversion circuit 200 includes an IT66121FN chip. It should be understood that in other embodiments, other types of chips may be included.
In one embodiment, the second signal conversion circuit 200 further comprises a microprocessor, which is connected to the IT66121FN chip and controls HDCP communication of the HDMI signal of the second signal conversion circuit 200.
Referring to fig. 3, in one embodiment, the master circuit 300 includes: the controller 310 and the sampling control circuit 320, the control end of the sampling control circuit 320 is connected with the controller 310, and the output end of the sampling control circuit 320 is connected with the second signal conversion circuit 200; the controller 310 is configured to convert the target LVTTL signal into an HDMI signal and detect whether the HDMI signal is a standard HDMI signal; the sampling control circuit 320 is used to control the second signal conversion circuit 200 to output the HDMI signal to the controller 310 under the control of the controller 310.
It should be understood that the controller 310 may be formed by a device or a chip having audio and video signal processing and analyzing functions, such as an audio and video processing chip, and the controller 310 in this embodiment adopts an audio and video processing chip with a model of MSD3553NUA, and in other embodiments, other models of audio and video processing chips may be adopted. The sampling control circuit 320 may be formed by a controllable switch, such as a switch tube.
Referring to fig. 4, in one embodiment, the sampling control circuit 320 includes: the sampling circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first switch tube Q1, wherein the first end of the first resistor R1 and the first end of the second resistor R2 are connected in common to serve as the input end of the sampling control circuit 320, the second end of the first resistor R1 is connected with the control end of the first switch tube Q1, the second end of the second resistor R2 and the first end of the third resistor R3 are connected in common to a power supply V1, the second end of the third resistor R3 and the high-potential end of the first switch tube Q1 are connected in common to serve as the output end of the sampling control circuit 320, and the low-potential end of the first switch tube Q1 is grounded.
It should be understood that the voltage of the power source V1 is 5V in this embodiment, and in other embodiments, other low voltage power sources may be used; in this embodiment, the first switch Q1 is an NPN transistor, wherein a base of the NPN transistor is a control terminal of the first switch Q1, a collector of the NPN transistor is a high potential terminal of the first switch Q1, and an emitter of the NPN transistor is a low potential terminal of the first switch Q1, and in other embodiments, the first switch Q1 may adopt other switch transistors, such as a PMOS transistor, an NMOS transistor, and a PNP transistor.
A second aspect of this embodiment provides a television board miniLVDS signal detection device, which includes the television board miniLVDS signal detection circuit described in the first aspect of this embodiment.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A kind of television integrated circuit miniLVDS signal detection circuit, characterized by, including:
the first signal conversion circuit is used for being connected with a miniLVDS interface of a television board to be tested and converting a miniLVDS signal of the television board to be tested into a target LVTTL signal;
the second signal conversion circuit is connected with the first signal conversion circuit and is used for converting the target LVTTL signal into an HDMI signal; and
and the master control circuit is connected with the second signal conversion circuit and is used for acquiring and detecting the HDMI signals.
2. The television board miniLVDS signal detection circuit of claim 1, wherein the first signal conversion circuit includes:
the input circuit is used for accessing the miniLVDS signal;
a switch switching circuit for generating a control signal; and
and the conversion circuit is connected with the input circuit and the switch switching circuit, and is used for converting the miniLVDS signal into a target LVTTL signal under the control of the control signal.
3. The television board miniLVDS signal detection circuit of claim 2, characterized in that the input circuit comprises:
and the input end of the electrostatic impedor is connected with the miniLVDS interface, and the output end of the electrostatic impedor is connected with the conversion circuit.
4. The television board miniLVDS signal detection circuit of claim 2, characterized in that the switch switching circuit comprises: and the common end of the multi-channel analog selector switch is connected with an external power supply, and each branch end of the multi-channel analog selector switch is connected with each enable end of the conversion circuit respectively.
5. The television board miniLVDS signal detection circuit of claim 2, characterized in that the conversion circuit comprises an FPGA XC6SLX16 chip.
6. The television board miniLVDS signal detection circuit of claim 1, characterized in that the second signal conversion circuit includes an IT66121FN chip.
7. The television board miniLVDS signal detection circuit of claim 6, wherein the second signal conversion circuit further includes a microprocessor, the microprocessor is connected with the IT66121FN chip, and the microprocessor controls HDCP communication of HDMI signals of the second signal conversion circuit.
8. The television board miniLVDS signal detection circuit of claim 1, wherein the main control circuit includes:
the controller is used for converting the target LVTTL signal into the HDMI signal and detecting whether the HDMI signal is a standard HDMI signal; and
the sampling control circuit, the control end of sampling control circuit with the controller is connected, the output of sampling control circuit with second signal conversion circuit connects, the sampling control circuit is used for under the control of controller, control second signal conversion circuit output the HDMI signal arrives the controller.
9. The television board miniLVDS signal detection circuit of claim 8, wherein the sampling control circuit includes: the sampling circuit comprises a first resistor, a second resistor, a third resistor and a first switching tube, wherein the first end of the first resistor and the first end of the second resistor are connected in common to serve as the input end of the sampling control circuit, the second end of the first resistor is connected with the control end of the first switching tube, the second end of the second resistor and the first end of the third resistor are connected in common to a power supply, the second end of the third resistor and the high-potential end of the first switching tube are connected in common to serve as the output end of the sampling control circuit, and the low-potential end of the first switching tube is grounded.
10. A television board miniLVDS signal detection device, characterized in that it comprises a television board miniLVDS signal detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020273084.7U CN211481395U (en) | 2020-03-06 | 2020-03-06 | Television board miniLVDS signal detection circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020273084.7U CN211481395U (en) | 2020-03-06 | 2020-03-06 | Television board miniLVDS signal detection circuit and device |
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| CN211481395U true CN211481395U (en) | 2020-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113870747A (en) * | 2021-09-24 | 2021-12-31 | 惠州视维新技术有限公司 | Adapter plate and point screen system |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113870747A (en) * | 2021-09-24 | 2021-12-31 | 惠州视维新技术有限公司 | Adapter plate and point screen system |
| CN113870747B (en) * | 2021-09-24 | 2023-11-14 | 惠州视维新技术有限公司 | Adapter plate and point screen system |
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