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A crash-proof external image source interface circuit

An external image and signal source technology, applied in image communication, color TV parts, TV system parts, etc., can solve problems such as display device crashes and failures, and achieve the effect of convenient upgrade and debugging

Active Publication Date: 2020-05-22
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the definition of the image source interface of the user equipment may be a non-standardized interface, the terminals corresponding to the two free terminals of the external image source interface in the image source interface of the user equipment may be defined as other network or ground interfaces. When the user uses After the standard cable connects the user equipment to the display device, the input terminal RX and output terminal TX of the serial port communication of the display device may be connected to other networks or short-circuited to the ground, causing the display device to crash or fail to power on

Method used

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  • A crash-proof external image source interface circuit
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  • A crash-proof external image source interface circuit

Examples

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Effect test

Embodiment 1

[0023] Taking the VGA interface as an example, the anti-crash external image source interface circuit provided by the embodiment of the present invention is described.

[0024] Such as image 3 As shown, the embodiment of the present invention provides an anti-crash VGA interface circuit, the input terminal of the isolation detection module 10 is electrically connected to the fifth terminal 011 of the VGA interface, and the output terminal is connected to the enable control terminal of the signal switching switch 20 electrical connection.

[0025] The isolation detection module 10 in the embodiment of the present invention uses an NPN transistor to realize its isolation detection function, specifically, as image 3 As shown, the isolation detection module 10 includes: a first NPN transistor V1, wherein the base of the first NPN transistor V1 is electrically connected to the cable detection terminal of the VGA interface through the first current limiting resistor R2, and the f...

Embodiment 2

[0032] The difference from Embodiment 1 is that the isolation detection module 10 uses a program controller MCU to realize its isolation detection function, specifically, as Figure 4 As shown, the isolation detection module 10 includes an MCU111.

[0033] The power input terminal of the MCU 111 is electrically connected to the first working power VCC1 , and the first working power VCC1 provides power for the MCU 111 .

[0034] The signal input end of the MCU111 is electrically connected to the cable detection terminal of the VGA interface through the first current limiting resistor R2, and the signal input end of the MCU111 is also electrically connected to the first working power supply through the first current limiting resistor R2 and the first pull-up resistor R1 VCC1.

[0035] In order to facilitate the timely reset of the MCU, the circuit also includes a reset sub-circuit, the reset terminal of the MCU 111 is electrically connected to the first working power supply VCC...

Embodiment 3

[0043] The anti-crash external image source interface circuit provided by the embodiment of the present invention, such as Figure 5 As shown, the difference with Embodiment 1 is that, on the one hand, the isolation detection module 10 in the anti-crash external image source interface circuit provided by the embodiment of the present invention adopts a microprogram controller MCU111; on the other hand, the present invention The signal switch 20 in the anti-crash external image source interface circuit provided by the embodiment includes a high-level signal switch chip 21 .

[0044] Such as Figure 5 As shown, the embodiment of the present invention provides another anti-crash VGA interface circuit, and the input end of the isolation detection module 10 is electrically connected to the fifth terminal 011 of the VGA interface.

[0045] The power input terminal of the MCU 111 is electrically connected to the first working power VCC1 , and the first working power VCC1 provides po...

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PUM

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Abstract

The invention discloses an external image signal source interface circuit capable of preventing system halt. The external image signal source interface circuit capable of preventing system halt comprises a signal switching switch and an isolation detection module; two input ends of the signal switching switch are electrically connected with a first idle terminal and a second idle terminal of the external image signal source interface respectively; two output ends are electrically connected with the input end and output end of a main chip communication module of a display device respectively; and input end of the isolation detection module is electrically connected with a cable detection terminal of the external image signal source interface while the output end thereof is electrically connected with an enabling control end of the signal switching switch. According to the external image signal source interface circuit capable of preventing system halt, provided by the embodiment, not only convenience is brought to upgrade debugging for the main chip of the display device in a development process, but also the phenomenon that the display device is in system halt or cannot be started up cannot happen when the display device is connected with user equipment through a standard cable.

Description

technical field [0001] The invention relates to the technical field of an external image source interface circuit, in particular to a crash-proof external image source interface circuit. Background technique [0002] In the field of video image display, a standard cable such as a VGA (Video Graphics Array, Video Graphics Array) cable or a DVI (Digital Visual Interface, Digital Visual Interface) cable is generally used to connect the user equipment to a display device such as a TV or a monitor. When in use, one end of the standard cable is electrically connected to the user equipment through the image source interface of the user equipment, and the other end is electrically connected to the display device through an external image source interface set on the display device, such as a VGA interface or a DVI interface, so as to establish The display data channel between the display device and the user device displays the content that the user needs to display on the display dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/268H04N5/765
CPCH04N5/268H04N5/765
Inventor 骆俊谕洪胜峰
Owner HISENSE VISUAL TECH CO LTD