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Virtual differential analog front end circuit and image processing apparatus

A technology for simulating front-end circuits and image processing devices, which is applied in the direction of logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, instruments, etc., and can solve problems such as signal distortion and excessive number of pins. Achieve the effects of reducing power consumption and area, optimizing image quality, and improving quality characteristics

Active Publication Date: 2009-06-10
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] In view of the above problems, the purpose of the present invention is to provide a virtual differential analog front-end circuit to solve the problems of signal distortion, number of components and too many pins of IC caused by single-ended conversion

Method used

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  • Virtual differential analog front end circuit and image processing apparatus
  • Virtual differential analog front end circuit and image processing apparatus
  • Virtual differential analog front end circuit and image processing apparatus

Examples

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Embodiment Construction

[0038] Figure 5A It is a schematic diagram of the structure of the virtual differential analog front-end circuit of the present invention. reference Figure 5A The virtual differential analog front-end circuit 590 of the present invention includes at least one conversion circuit (510, 520, 530) for receiving at least one image analog signal (A1, A2, A3), and generating at least one digital signal (D1, D2) , D3). Each conversion circuit includes a clamp (111, 121, 131), an input buffer (112, 122, 132), and an analog-to-digital converter (113, 123, 133). Taking the conversion circuit 510 as an example, the clamper 111 receives the analog image signal A1 and reconstructs the DC level of the analog image signal A1 to generate a reconstructed signal E1. The reconstructed signal E1 is input to the buffer 112 and then outputs a buffered signal B1. The analog-to-digital converter 113 includes positive and negative input terminals, one of which receives the aforementioned buffer signal B...

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Abstract

The invention provides an image processing device, which comprises a virtual differential analog front end circuit. The front end circuit is used for receiving at least one image analog signal, and generates at least one digital signal. The virtual differential analog front end circuit comprises at least one conversion circuit, each conversion circuit comprises a clamper, an input buffer and an analog-to-digital converter, wherein when the number of the conversion circuits is larger than 1, various analog-to-digital converters receive the same comparative voltage.

Description

Technical field [0001] The present invention relates to a display system, in particular to an image processing device used in the display system, and more particularly to an image processing device with a virtual differential analog front-end circuit. Background technique [0002] Many computer system display cards (VGA cards) can only output analog image signals, so LCDs must convert analog signals to digital signals before they can be displayed. The liquid crystal display uses an analog front end circuit (Analog Front End, AFE) to do the work of signal conversion. The analog image signal is composed of red (R), green (G), and blue (B) signals. Therefore, the analog front-end circuit includes three groups of circuits to process these three signals separately. The liquid crystal display controller mainly includes an analog front-end circuit, a digital scaling circuit (scalar) and some other peripheral circuits. With the improvement of chip integration, the current trend is to int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20H03K19/0185
Inventor 蔡瑞原
Owner REALTEK SEMICON CORP
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