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Switching circuit based on hdmi interface

A technology of HDMI interface and switching circuit, which is applied in the field of bus line switching circuit, can solve problems such as the impact of upgrading measures, achieve serial port debugging and software upgrading, and realize the effect of high-definition video signal transmission

Active Publication Date: 2018-03-16
SHENZHEN TALENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then in the era of digital TV, HDMI interface (high-definition multimedia interface) became the standard configuration, and output devices with VGA interface were gradually replaced by HDMI interface, such as graphics cards, projectors, etc., and the TV industry also eliminated VGA interface and replaced it. Replaced by HDMI interface, but this has an impact on the current upgrade measures

Method used

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  • Switching circuit based on hdmi interface

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Embodiment Construction

[0013] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0014] see figure 1 The switching circuit based on the HDMI interface provided by the embodiment of the present invention mainly includes a main chip, a control circuit 2, and an HMDI interface module, and the HDMI interface module includes an HDMI socket 3, an HDMI interface circuit 4, and a hot plug interface HOT PLUG. Several device modules, the hot-swappable interface HOT PLUG is an interface used to connect with an HDMI cable. When an HDMI cable is connected to the hot-swappable interface HOT PLUG, the switching circuit of this embodiment realizes its original The function is to transmit high-frequency audio and video signals. When no HDMI cable is connected, it can realize the serial port debugging and upgrading of the main chip 1 through the switching circuit without opening the back cover of the TV for operation.

[0015] Specifically, the main...

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Abstract

The present invention relates to a switching circuit based on an HDMI interface, which includes a main chip, a control circuit, and an HMDI interface module, and the HDMI interface module includes an HDMI socket, an HDMI interface circuit, and a hot-swappable interface for connecting with an HDMI cable; The main chip has a first I / O port, a second I / O port, a first UART port, a second UART port and a hot plug port, the first UART port is connected with an output port, and the second UART port is connected with a receiving port The HDMI interface circuit includes resistor R1, resistor R2, resistor R3 and transistor Q1, the control circuit includes resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, transistor Q2, transistor Q3 and transistor Q4, Its implementation can realize the effects of serial port debugging and software upgrading without affecting the original normal functions.

Description

technical field [0001] The invention relates to a bus wire switching circuit, in particular to a switching circuit based on an HDMI interface. Background technique [0002] In the TV industry, due to the loopholes in the firmware released during the production of boards, customers may request to upgrade the firmware to solve the loopholes after the boards are produced and assembled into a complete machine. This requires the board card supplier to use the serial port tool board to upgrade the main board without dismantling the back cover of the TV. In the previous era of analog TV, the main board will be equipped with a VGA interface as standard, which is used to connect VGA signal output devices such as computer hosts. Moreover, this port is exposed behind the back cover of the TV without removing the back cover, which solves the upgrade problem very well. Then in the era of digital TV, HDMI interface (high-definition multimedia interface) became standard configuration, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/765
Inventor 齐永林冯加勤巫丙亮
Owner SHENZHEN TALENT TECH
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