Detection circuit and detection system for detecting pin abnormality of differential pair in display interface
A technology of display interface and detection system, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as difficulty in detecting differential signal air welding or short circuit, high maintenance cost, poor signal quality, etc., and achieve good signal quality. quality, maintain signal quality, and reduce production costs
Inactive Publication Date: 2014-11-05
CHROMA ATE
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Problems solved by technology
In addition, even if there is an empty welding or short circuit of a differential signal in the production of HDMI or DVI interface, because the judgment ability of the demodulation IC of the DUT is strong enough, it is still possible to output the signal normally.
[0004] However, when the HDMI interface is widely used, it is difficult for major manufacturers to detect the empty soldering or short circuit of the differential signal in production.
Problems are often discovered only in the second half of the production test, or even when the signal source with poor signal quality is encountered after shipment, so a higher maintenance cost must be attached
As a result, serious losses will be caused regardless of cost or customer perception
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[0047] see figure 1 and figure 2 . figure 1 It is a schematic diagram showing a display interface soldered on the circuit board B according to a specific embodiment of the present invention. figure 2 It is a schematic diagram showing the simple structure of the SINK side of the HDMI interface according to a specific embodiment of the present invention. Such as figure 1 As shown, the display interface A of this embodiment is described as HDMI Type A, but the definition of the pins will not be repeated here. In addition, the present invention detects the problems often encountered in the production of the HDMI interface, such as TMDS empty soldering or short circuit, through figure 2 You can understand the simple structure of the SINK end of HDMI, where the differential signal (positive or negative pin) is connected to a terminal resistor R T , and is loaded to the internal bias A Vcc , to take advantage of this feature for detection. The above-mentioned simplified str...
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The invention discloses a detection circuit and a detection system for detecting the pin abnormality of a differential pair in a display interface. The detection circuit comprises a first abnormal alarming module, two first light-emitting diodes and two first current-limiting resistors. After being commonly and electrically connected with a first common junction, the two first light-emitting diodes are respectively connected with two first current-limiting resistors in series and connected with a first anode junction and a first cathode junction. The detection circuit provided by the invention has a simple integral structure, and can be directly combined with an HDMI (high-definition multimedia interface) or a DVI (digital video interface) so as to reduce the integral production cost and maintain good signal quality.
Description
technical field [0001] The invention relates to a detection circuit and a detection system thereof, in particular to a detection circuit and a detection system thereof for detecting an abnormality of a differential pair pin position of a display interface. Background technique [0002] At present, most of the video products on the market, such as TVs, monitors or computers, have been equipped with high definition multimedia interface (High Definition Media Interface, HDMI) or digital signal transmission using TMDS (Transition Minimized Differential Signaling) technology to achieve video and audio transmission. Video interface (Digital Visual Interface, DVI). [0003] Since the TMDS technology uses several sets of differential signals for transmission, the HDMI and DVI interfaces have the advantages of anti-interference ability, effective suppression of electromagnetic interference (EMI) and accurate timing positioning compared with the interface of single signal transmission...
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IPC IPC(8): G01R31/02
Inventor 徐建明张皓柏
Owner CHROMA ATE