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A circuit for eliminating water ripples of a VGA display interface and a working method thereof

A display interface and water ripple technology, which is applied in the direction of digital output to display devices, TVs, electrical components, etc., can solve the problems of embedded product power supply quality and harsh use environment, poor VGA display effect, and inability to eliminate water ripples. Achieve the effect of improving the display effect, eliminating water ripples, and wide application range

Inactive Publication Date: 2019-06-07
XIAN MICROELECTRONICS TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, products based on VGA interface are widely used in embedded products, but because embedded products do not use point-to-point connection methods like general-purpose computers when using VGA interfaces, they often use multi-level transfer methods to connect VGA interfaces, and The power supply quality and operating environment of embedded products are relatively harsh, and the digital ground and the chassis ground are often in an isolated state, which may easily cause poor VGA display effects, and often display water ripples and other phenomena, resulting in poor display effects. The VGA interface circuit is generally integrated in the VGA display interface part of the computer. In the case of embedded applications, this part of the circuit is often unable to eliminate the phenomenon of water ripples on the display.

Method used

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  • A circuit for eliminating water ripples of a VGA display interface and a working method thereof
  • A circuit for eliminating water ripples of a VGA display interface and a working method thereof
  • A circuit for eliminating water ripples of a VGA display interface and a working method thereof

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Embodiment

[0035] see figure 2 , between the red signal of the VGA interface and the corresponding red analog ground, the common-mode interference and differential-mode interference signals on the red signal are eliminated through common-mode inductors and double π-type filter circuits; the common-mode inductor uses TFQ0403 EMI filter inductors, π The type filter is composed of 60@100MHz magnetic beads and two 10pF capacitors;

[0036] see figure 2 , between the green signal of the VGA interface and the corresponding green analog ground, the common-mode interference and differential-mode interference signals on the green signal are eliminated through common-mode inductors and double π-type filter circuits; the common-mode inductor uses TFQ0403 EMI filter inductors, π The type filter is composed of 60@100MHz magnetic beads and two 10pF capacitors;

[0037] see figure 2 , between the blue signal of the VGA interface and the corresponding blue analog ground, the common mode interferen...

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Abstract

The invention discloses a circuit for eliminating water ripples of a VGA (Video Graphics Array) display interface and a working method of the circuit. Perform special common mode and differential modefiltering on the analog signals of red, green and blue of the VGA display interface, and filter and shape the digital signals H-SYNC and V-SYNC to remove various interference signals loaded into theVGA display signal. The signal at the VGA receiving end reaches the display signal that can be normally collected by the display, thereby eliminating the interference caused by the VGA display cable,and eliminating the water ripple on the VGA display.

Description

technical field [0001] The invention belongs to the technical field of embedded systems, and in particular relates to a circuit for eliminating water ripples of a VGA display interface and a working method thereof. Background technique [0002] At present, products based on VGA interface are widely used in embedded products, but because embedded products do not use point-to-point connection methods like general-purpose computers when using VGA interfaces, they often use multi-level transfer methods to connect VGA interfaces, and The power supply quality and operating environment of embedded products are relatively harsh, and the digital ground and the chassis ground are often in an isolated state, which may easily cause poor VGA display effects, and often display water ripples and other phenomena, resulting in poor display effects. The VGA interface circuit is generally integrated in the VGA display interface part of the computer. In the case of embedded applications, this p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/765G06F3/14
Inventor 许军贺占庄李灏赵瑞丹
Owner XIAN MICROELECTRONICS TECH INST
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