This application claims priority to Chinese Patent Application No. 201510123407.8 filed on Mar. 20, 2015, the contents of which are incorporated by reference herein.
The subject matter herein generally relates to detecting circuits, and particularly to a detecting circuit for detecting a signal wire of a display.
A desktop computer often includes a host computer and a display connected to the host computer by a signal wire. The host computer sends video signal to the display, and the display shows corresponding information on its screen. Sometime, the screen can not be lighted on because the host computer can not outputs the video signal or the screen breaks down, or some other reason, such as the signal wire being loose with the display or the host computer. It is often difficult for user to clarify that it is what reasons causes the screen can not be lighted on. For example, if the the signal wire is loose to cause the screen to be blank screen and the user does not clarify the reasons, the users may considers the screen being broken down and buys a new display, which causes waste. Thus, there is room for improvement in the art.
Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.
A detecting and indicating circuit 40 is set in the host computer 10. The detecting and indicating circuit 40 is connected to the first port 11.
Referring to
To work, when the signal wire 20 connects the first port 11 and the second port 31 well, the first display mark bit pin ID1 is connected to ground and outputs a low level voltage signal to the detecting pin 411. Thus, the control pin 412 outputs a low level voltage signal to the gate of the transistor Q to turn off the transistor Q. The LED L does not lights.
When the signal wire 20 does not connects the first port 11 and the second port 31 well, the first display mark bit pin ID1 is not connected to ground. The power source V provides a high level voltage signal to the detecting pin 411. The control pin 412 outputs a high level voltage signal to the gate of the transistor Q to turn on the transistor Q. The LED L lights to indicates that the signal wire 20 is loose.
The embodiments shown and described above are only examples. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size, and arrangement of the parts within the principles of the present disclosure, up to, and including, the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.
Number | Date | Country | Kind |
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201510123407.8 | Mar 2015 | CN | national |