DVI-I and VGA interface circuit

A VGA interface, DVI-I technology, applied in the field of high-definition display, can solve the problems such as no public reports, and achieve the effect of simple structure

Inactive Publication Date: 2009-04-08
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Through literature search, there is no public report identical with the present invention

Method used

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  • DVI-I and VGA interface circuit
  • DVI-I and VGA interface circuit

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Embodiment 1

[0017] It is suitable for systems where the output signal of the media processor is 1.8V level. Such as figure 1 Shown: The circuit consists of TFP410 DVI transmitter chip 1, THS8135 three-way video DAC conversion chip 2, 74AVC2T45 1.8V to 3.3V level conversion chip 3, VGA output socket 4, DVI-I output socket 5 and reference voltage divider resistors 6 composition. The 1.8V level signal R, G, B data lines and VCLK video clock lines from the media processor are respectively connected to the data input pins and clock input of TFP410 DVI transmitter chip 1 and THS8135 three-way video DAC conversion chip 2 pins; the video data enable signal DE is connected to the DE input pin of TFP410; the horizontal and vertical synchronization signals HSYNC and VSYNC are connected to the horizontal and vertical synchronization signal pins of TFP410 at the same time, and the 1.8V level is converted to meet the VGA interface through 74AVC2T45 After the required 3.3V level, connect to VGA output...

Embodiment 2

[0019] It is suitable for systems where the output signal of the media processor is 3.3V level. Such as figure 2 As shown: the circuit is composed of TFP410 DVI transmitter chip 1, THS8134 three-way video DAC conversion chip 2, VGA output socket 4 and DVI-I output socket 5. Since the digital signal to be processed is a 3.3V level signal, at this time, the three-way video DAC conversion chip adopts THS8134 to directly process the 3.3V level signal; the line and field synchronization signals HSYNC and VSYNC do not need to be level converted, and are directly connected to the VGA socket and DVI-I socket; the VREF pin of TFP410 does not need to be divided by a voltage divider resistor, and is directly connected to the 3.3V voltage.

[0020] Use shows: a kind of DVI-I of the present invention and VGA interface circuit, structure is simple, support bandwidth is high, support high-definition resolution, support DVI and VGA dual-port display output on the same screen, and debugging ...

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Abstract

The present invention relates to a DVI-I and VGA interface circuit, in particular to the design of a DVI and VGA output circuit for an embedded system, which belongs to the technical field of high vision display. The DVI-I and VGA interface circuit is a processing circuit which can be applied to an embedded system, can be based on a digital medium processor and can output DVI and VGA at the same time. The interface circuit of the invention comprises a DVI transmitter chip (1), a three-channel video DAC conversion chip (2), a 1.8V to 3.3V of level conversion chip (3), a VGA output socket (4), a DVI-I output socket (5) and a reference voltage division resistor (6). The interface circuit has simple structure, practicability and high efficiency, stability and reliability. Being used as the reference design of the DVI and VGA output circuit in an embedded video decoding playing device, the interface circuit can be widely applied to the embedded fields of digital monitoring systems, IP machine top boxes, KTV machine top boxes and multimedia information issuing systems.

Description

Technical field: [0001] The invention relates to a DVI-I and VGA interface circuit, in particular to the design of an embedded system DVI and VGA output circuit, and belongs to the technical field of high-definition display. Background technique: [0002] At present, the reference designs provided by most media processor manufacturers only involve component and composite video output interfaces, and do not provide DVI and VGA interface design solutions. Compared with the relatively rich DVI and VGA input circuit designs in display devices, the corresponding output circuit designs in embedded video decoding and playback devices are relatively scarce. With the increasing demand for high-definition display devices and embedded browser applications, this problem has become more prominent. [0003] Through document search, do not see the public report identical with the present invention. Invention content: [0004] The purpose of the present invention is to overcome the defi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/00
Inventor 王耀希周永录代红兵姚寒冰王丽清
Owner YUNNAN UNIV
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