KR20030044632A - Apparatus for processing input signal of lcd monitor - Google Patents

Abstract

PURPOSE: An apparatus for processing an input signal of an LCD monitor is provided to prevent analog devices from affecting a digital dot clock so as to minimize deterioration of quality. CONSTITUTION: An apparatus for processing an input signal of an LCD monitor includes the first and second signal input units(100,300), a receiver(200), a multiplexer(400), a video signal processor(500), and a microcomputer(600). The first signal input unit receives a digital video signal. The receiver receives the digital video signal and separates horizontal/vertical synchronous signals and dot clock from the signal. The second signal input unit receives an analog video signal and separates horizontal/vertical synchronous signals and dot clock from the analog video signal. The multiplexer accepts the horizontal and vertical synchronous signals and dot clock from the receiver or the second signal input unit to selectively output the signals. The video signal processor receives the selected signal to process the signal into a signal to be displayed on an LCD module. The microcomputer outputs a control signal to the multiplexer to select the horizontal/vertical synchronous signals or dot clock.

Description

Apparatus for processing input signal of LCD monitor}

The present invention relates to a monitor, and more particularly, to an input signal processing apparatus of an LCD monitor.

With the development of display technology, digital LCD monitors that are lighter and have higher image quality than conventional CRT methods are being commercialized.

Unlike the conventional analog CRT, which has one video signal input source, such a digital LCD monitor supports more than one video signal input and thus has a plurality of input ports, and generally processes two video signal inputs. It is equipped with two input ports.

That is, the analog signal and the digital signal can be divided into input through each input port, the analog signal is applied to the analog R / G / B signal, the digital signal is a Transition Minimized Differential Signal (TMDS) ) Or Low Voltage Differential Signal (LVDS).

Hereinafter, an input signal processing apparatus of an LCD monitor according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram illustrating an input signal processing apparatus of an LCD monitor according to the prior art.

The input signal processing apparatus of the LCD monitor according to the prior art includes a first signal input unit 10 for receiving a digital image signal and a TMDS receiver 20 for receiving a digital signal input through the first signal input unit 10. ), A second signal input unit 30 for receiving an analog image signal, and a multiplexer for selecting an image signal input through the TMDS receiver 20 or the second signal input unit 30 according to a control signal. 40, a dot clock output from the TMDS receiver 20 or the second signal input unit 30, and an image signal output from the multiplexer 40 are received and displayed on an LCD module (not shown). The image signal processor 50 for processing the signal as possible and the output of the RMDS receiver 20 or the second signal input unit 30 can be selected according to the user's request. Control signal to It consists of a microcomputer 60 that force.

Here, the first signal input unit 10 is DVI-D, and the second signal input unit 30 is D_SUB.

The input signal processing apparatus of the LCD monitor according to the related art, configured as described above, receives a horizontal / vertical synchronization signal (H / V Sync) from the TMDS receiver 20 receiving the digital signal input through the first signal input unit 10. And the multiplexer 30 is an analog horizontal / vertical sync inputted through the digital horizontal / vertical sync signal (H / V sync) separated from the TMDS receiver 20 and the second signal input unit 30. It receives the signal (H / V Sync) and selectively outputs it.

As such, the horizontal / vertical sync signal (H / V Sync) is separated when the analog and digital video signals are input, and only the horizontal / vertical sync signal input to the multiplexer 40 is selected and the video signal processor 50 is used. As it is input to, it does not give any interference with each other.

However, since a bead, a register, and the like are connected to the dot clock terminal of the second signal input unit 30, the bead, the register, etc., output a digital dot clock when the TMDS receiver 20 is digitally output. This can affect timing delays and the like.

As described above, the input signal processing apparatus of the LCD monitor according to the related art is an image signal processing unit that is integrated through one line without separately separating the dot clocks generated when the analog and digital image signals are input through a plurality of ports. There was a problem that caused an important quality defect of the LCD monitor by generating a vertical line glitter noise when outputting the screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an input signal processing apparatus of an LCD monitor which separates horizontal / vertical sync signals and dot clocks and inputs multiplexers at the same time when analog and digital video signals are simultaneously input. The purpose is to provide.

1 is a block diagram showing an input signal processing apparatus of an LCD monitor according to the prior art;

2 is a block diagram showing an input signal processing apparatus of an LCD monitor according to the present invention;

Explanation of symbols for main parts of the drawings

100: first signal input unit 200: receiver

300: second signal input unit 400: multiplexer

500: video signal processing unit 600: microcomputer

In order to achieve the above object, an input signal processing apparatus for an LCD monitor according to the present invention includes a first signal input unit for receiving a digital image signal, and a digital signal input through the first signal input unit in an LCD monitor having an LCD module. A receiver for receiving a video signal and separating and outputting a horizontal / vertical synchronizing signal and a dot clock; a second signal input unit for receiving an analog video signal and separating and outputting a horizontal / vertical synchronizing signal and a dot clock; A multiplexer for receiving and selectively outputting a horizontal / vertical sync signal and a dot clock input through the receiver or the second signal input unit, and a horizontal / vertical sync signal and a dot clock of an image signal selected by the multiplexer An image signal processing unit for receiving an input and processing the signal as displayable on the LCD module, and according to a user's request And a microcomputer for outputting a control signal to the multiplexer so that a horizontal / vertical synchronization signal and a dot clock input through the first signal input unit or the second signal input unit can be selected.

Hereinafter, an input signal processing apparatus of an LCD monitor according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing an input signal processing apparatus of an LCD monitor according to the present invention.

As shown in FIG. 2, an input signal processing apparatus of an LCD monitor according to the present invention includes a first signal input unit 100 receiving a digital image signal, and a digital image signal input through the first signal input unit 100. TMDS receiver 200 for receiving the horizontal / vertical sync signal (H / V Sync) and the dot clock (Dot Clock) separately and receiving the analog video signal, and receiving the horizontal / vertical sync signal (H / V Sync). And a horizontal / vertical synchronization signal H input through the second signal input unit 300 and the second signal input unit 300 according to a control signal according to a control signal. / V Sync) and a dot clock (Dot Clock) to receive and selectively output, and a horizontal / vertical synchronization signal (H / V Sync) of the video signal selected by the multiplexer 400 And dot clock input to display on LCD module (not shown) A video signal processor 500 for processing a signal, and a horizontal / vertical sync signal (H / V Sync) and a dot clock input through the TMDS receiver 200 or the second signal input unit 300 according to a user's request. The microcomputer 600 outputs a control signal to the multiplexer 400 so that (Dot Clock) can be selected.

The first signal input unit 100 is DVI_D, and the second signal input unit 200 is D_SUB.

Referring to the operation of the input signal processing apparatus of the LCD monitor according to the present invention configured as described above are as follows.

First, the TMDS receiver 200 separates a horizontal / vertical sync signal (H / V Sync) and a dot clock from a digital image signal input through the first signal input unit 100.

In addition, the horizontal / vertical sync signal (H / V Sync) and the dot clock (Dot Clock) separated from the TMDS receiver 200 and the (H / V Sync) and dot separated through the second signal input unit 300 are included. A clock is input to the multiplexer 400, respectively.

Then, the multiplexer 400 is input through the (H / V Sync) and the dot clock (Dot Clock) or the second signal input unit 300 input through the TMDS receiver 200 according to a user's request. Any one of a video signal, a horizontal / vertical sync signal (H / V Sync), and a dot clock is selected and output.

The video signal, the horizontal / vertical sync signal (H / V Sync), and the dot clock selected by the multiplexer 400 are input to the video signal processor 500 and displayed on the LCD module (not shown). Is processed into possible signals.

Therefore, a dot clock is separately input to the multiplexer 400 for analog and digital inputs, and a horizontal / vertical synchronization signal (H / V Sync) is selected when a corresponding video signal is selected according to the control signal of the microcomputer 600. ) And the dot clock are also selected at the same time.

Accordingly, by separating the analog dot clock and the digital dot clock, the beads, registers, and the like on the analog side do not interfere with the digital dot clock.

As described above, the input signal processing apparatus of the LCD monitor according to the present invention does not interfere with the digital dot clock so that the analog devices do not interfere with the digital dot clock, and therefore, even in high resolutions such as 1600 * 1200, the quality defect rate is minimized. It can be effective.

Claims (2)

In an LCD monitor with an LCD module, A first signal input unit configured to receive a digital video signal; A receiver for receiving a digital video signal input through the first signal input unit and separating and outputting a horizontal / vertical synchronization signal and a dot clock; A second signal input unit which receives an analog video signal and separates the horizontal / vertical synchronization signal and the dot clock and outputs the separated analog clock signals; A multiplexer for selectively receiving a horizontal / vertical synchronization signal and a dot clock inputted through the receiver or the second signal input unit according to a control signal; An image signal processor for receiving a horizontal / vertical synchronization signal and a dot clock of the image signal selected by the multiplexer and processing the signal into a displayable signal on the LCD module; And, And a microcomputer for outputting a control signal to the multiplexer so that a horizontal / vertical synchronization signal and a dot clock input through the receiver or the second signal input unit can be selected according to a user's request. Input signal processing device. The method of claim 1, The multiplexer According to the control signal of the microcomputer, either the horizontal / vertical synchronization signal (H / V Sync) of the signal input through the receiver or the second signal input unit is selected, and the corresponding dot clock is also selected. Input signal processing device of the LCD monitor.