KR100379417B1 - Method and apparatus for controlling selection input signal of LCD monitor - Google Patents

Abstract

An apparatus and method for selecting and controlling an input signal of an LCD monitor, the LCD monitor including a key input unit comprising: a first input unit for receiving an analog image signal, a second input unit for receiving an analog image signal and a digital image signal; An input selector for selecting one of the analog video signals output from the first and second input parts according to the signal, a digital signal converter for converting the analog video signal output from the input selector into a predetermined level digital video signal; A receiver for receiving a digital video signal output from the second input unit, a digital video processor for receiving a digital video signal output from the digital signal converter or receiver and converting the digital video signal into a video format displayable on a screen; Analyze frequency information of horizontal / vertical sync signal from negative or receiver And a microcomputer to determine the display format of the input image and output a control signal for controlling the OSD and the screen state according to a user's request input through the key input unit. By processing a video signal that can be displayed on the screen, it is possible to realize more various images on the screen and to expand the user range of the input signal.

Description

Method and apparatus for controlling selection input signal of LCD monitor

TECHNICAL FIELD The present invention relates to a monitor, and more particularly, to an apparatus and a method for controlling input signal selection 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.

Such a digital LCD monitor is configured to process an analog video signal input from the outside, that is, from a PC through digital conversion, and, unlike the conventional analog CRT having one video signal input source, one or more video signals. As it supports input, it has a plurality of input ports, and generally has two input ports to process two video signal inputs.

Hereinafter, an LCD monitor according to the related art will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an LCD monitor according to the prior art.

As shown in FIG. 1, the LCD monitor according to the related art includes first and second input units 1 and 2, and first and second input units 1 and 2 for inputting respective analog image signals. An input selector 3 for selecting one of the analog video signals input through the preamplifier, a preamplifier 4 for amplifying a predetermined level of the analog video signal selected by the input selector 3, and the preamplifier 4; A PLL (Phase Locked Loop) 5 generating a sampling clock for digital conversion of an analog video signal amplified by the PLL 5, and an analog selected by the input selector 3 using the sampling clock generated by the PLL 5. A / D converter 6 for converting video signals into digital video signals, and frame memory for temporarily storing digital R / G / B video signals output from the A / D converter 6 in units of frames. (7), output of the A / D converter 6 to the LCD panel 7 A digital video processor 8 for converting to a displayable image format, the digital video processor (LCD panel 9 for displaying a real image, a key input unit 10 for inputting an operation command of a user), and the key input unit The input selector 3 is controlled to output one of the analog video signals inputted through the first and second input units 1 and 2 according to a user's operation command or a predetermined algorithm. And a microcomputer 11 for setting the sampling clock frequency of the PLL 5.

Referring to the operation of the monitor according to the prior art configured as described above are as follows.

First, different analog video signals are inputted through the first and second input units 1 and 2.

Subsequently, the microcomputer 9 controls the input selection unit 3 according to a user's operation command input through the key input unit 10 or a preset algorithm to control the input unit 3 through the first and second input units 1 and 2. One of the inputs is output, and the frequency for the sampling clock of the PLL 5 is set so that the output signal can be converted to digital.

Therefore, the PLL 5 generates a sampling clock corresponding to the frequency set by the microcomputer 11, and the A / D converter 6 uses the sampling clock supplied from the PLL 5 to select the input selector 3. Converts the selected analog video signal into a digital video signal.

The digital video processor 8 then converts the digital video signal output from the A / D converter 6 into an image format displayable by the LCD module 9 and transmits it to the LCD module 9. The LCD module 9 displays the digital video signal transmitted from the digital video processor 8 on the screen.

As described above, the LCD monitor according to the related art is capable of coping with an analog signal input from a PC, but there is a problem in that there is no countermeasure for processing a digital video signal.

Disclosure of Invention The present invention has been made to solve such a problem, and an object of the present invention is to provide an apparatus and method for selecting an input signal of an LCD monitor to selectively process analog video signals and digital video signals to improve a user's selection range. There is this.

1 is a block diagram showing the configuration of an LCD monitor according to the prior art;

Figure 2 is a block diagram showing an input signal selection control device of the LCD monitor according to the present invention

3 is a flowchart illustrating a method of controlling an input signal selection of an LCD monitor according to the present invention.

Explanation of symbols for main parts of the drawings

100: first input unit 101: second input unit

102: input selection unit 103: receiver

104: preamplifier 105: PLL

106: A / D converter 107: digital video processor

108: memory 109: display data transmitter

110: LCD module 111: microcomputer

112: key input unit

The input signal selection control apparatus of the LCD monitor according to the present invention for achieving the above object comprises a first input unit for receiving an analog image signal, an analog image signal and a digital image signal in the LCD monitor having a key input unit; A second input unit, an input selection unit for selecting one of the analog image signals output from the first and second input units according to a control signal, and an analog image signal output from the input selection unit by a predetermined level amplification and sampling at a predetermined period A digital signal converter for converting a digital video signal, a receiver for receiving the digital video signal when the second input unit is output, and a digital video signal output from the digital signal converter or the receiver can be displayed on the screen. A digital video processor for converting to an image format and selecting the input Or a microcomputer analyzing the frequency information of the horizontal / vertical synchronization signal from the receiver to determine the display format of the input image, and outputting a control signal for controlling the OSD and the screen state according to a user's request input through the key input unit. It is composed by its features.

In accordance with an aspect of the present invention, there is provided a method for controlling selection of an input signal of an LCD monitor, the method comprising: an input signal selection control method of an LCD monitor including a first input unit, a second input unit, and a receiver; Setting an operation mode according to whether the horizontal / vertical synchronization signal is input from the first input unit, and determining whether the horizontal / vertical synchronization signal is input from the receiver if the user does not select the first input unit. And when the horizontal / vertical synchronizing signal is input from the receiver, processing the digital image signal input from the second input unit as a displayable image signal on a screen and setting it to a normal mode, and setting the horizontal / vertical signal from the receiver. If the synchronization signal is not input, whether the horizontal / vertical synchronization signal from the second input unit is input Depending makin comprises the step of setting the operation mode has its features.

Hereinafter, an input signal selection control apparatus and method of an LCD monitor according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating an input signal selection control apparatus of an LCD monitor according to the present invention, and FIG. 3 is a flowchart illustrating an input signal selection control method of the LCD monitor according to the present invention.

As shown in FIG. 2, the apparatus for selecting an input signal of the LCD monitor according to the present invention includes a first input unit 100 for receiving an analog image signal and a second input unit 110 for receiving an analog image signal and a digital image signal. And an input selector 120 for selecting one of the analog image signals output from the first and second input units 100 and 110 according to a control signal, and an analog image output from the input selector 120. A digital signal converter 130 for amplifying a predetermined level of a signal, sampling the signal at a predetermined period, and converting the signal into a digital video signal, and a memory 140 for storing the digital video signal output from the digital signal converter 130 in units of frames. And a receiver 150 for receiving the digital video signal from the second input unit 110 and receiving the digital video signal output from the digital signal converter 130 or the receiver 150. A digital video processor 160 for converting the image format into a video format displayable on a screen, an LCD module 180 for outputting a digital video signal output from the digital video processor 160, and the digital video processor 160. And display data Tx 170 for matching to a panel link form such as TTL or LVDS according to the interface form of the LCD module 180, a key input unit 190 for inputting a user request command, and the input selector 120. Or to analyze the frequency information of the horizontal / vertical synchronization signal from the receiver 150 to determine the display format of the input image, and to control the OSD and the screen state according to a user's request input through the key input unit 190. The microcomputer 200 outputs a control signal.

Here, the digital signal converter 130 may include a preamplifier 131 for amplifying a predetermined level of the analog image signal output from the input selector 120, and a video signal amplified by the preamplifier 131. And a PLL 132 for generating a predetermined sampling clock to be converted into a digital signal, and an A / D converter 133 for converting a digital video signal according to the sampling clock generated in the PLL 132.

The operation of the input signal selection control device of the LCD monitor according to the present invention configured as described above is as follows.

First, different analog video signals and digital video signals are inputted through the first and second input units 100 and 110.

Subsequently, the microcomputer 200 controls the input selection unit 120 according to a user's operation command or a predetermined algorithm input through the key input unit 190 to control the input selection unit 120 through the first and second input units 100 and 110. One of the inputs is output, and the frequency for the sampling clock of the PLL 132 is set so that the output signal can be converted to digital.

Therefore, the PLL 132 generates a sampling clock corresponding to the frequency set by the microcomputer 200, and the A / D converter 133 uses the sampling clock supplied from the PLL 132 to select the input selector 120. ) Converts the selected analog video signal into a digital video signal.

Subsequently, the digital video processor 160 converts the digital video signal output from the A / D converter 133 into an image format displayable by the LCD module 180 and transmits the converted video format to the LCD module 180. The LCD module 180 displays the digital video signal transmitted from the digital video processor 160 on the screen.

Meanwhile, when a digital video signal is input from the second input unit 110, the digital video signal is input to the receiver 150, and the horizontal / vertical synchronization signal of the digital video signal input to the receiver 150 is the microcomputer ( The microcomputer 200 recognizes this and operates in the normal mode.

Accordingly, the digital video signal input from the second input unit 110 is input to another port of the digital video processor 160 and processed as a video signal that can be displayed on the screen.

As described above, the control method of the input signal selection control apparatus of the LCD monitor according to the present invention will be described with reference to FIG.

Referring to FIG. 3, first, it is determined whether the user selects the first input unit (S1).

Subsequently, if the user does not select the first input unit as a result of the determination (S1), it is determined whether the horizontal / vertical synchronization signal is input from the receiver (S2).

As a result of the determination (S2), when the horizontal / vertical synchronization signal is input from the receiver, it is determined that the digital video signal is input and set to the digital normal mode (S3-S4).

In the meantime, if the horizontal / vertical synchronization signal is not input from the receiver (S2), the second input unit is selected (S5).

In operation S6, it is determined whether a horizontal / vertical synchronization signal is input from the second input unit.

Subsequently, if the horizontal / vertical synchronizing signal is not input from the second input unit (S6), it is determined whether a predetermined set time has elapsed (S7).

As a result of the determination (S7), if the preset time has elapsed, it is set to the power saving mode (S8).

On the other hand, if the horizontal / vertical synchronization signal is input from the second input unit as a result of the determination (S6), it is determined that the analog signal is input through the second input unit and set to the analog normal mode (S9-S10).

In addition, when the user selects the first input unit as a result of the determination (S1), it is determined whether a horizontal / vertical synchronization signal is input from the first input unit (S11).

Subsequently, if the horizontal / vertical synchronization signal is not input from the first input unit, the determination result 11 determines whether a predetermined set time has elapsed (S12).

As a result of the determination (S12), if the preset time has elapsed, it is set to the power saving mode (S13).

On the other hand, if the horizontal / vertical synchronization signal is input from the first input unit as a result of the determination (S11), the analog video signal input from the first input unit is processed as a displayable video signal on the screen and set to a normal mode (S14-). S15).

As described above, the apparatus and method for selecting an input signal of an LCD monitor according to the present invention may select an analog image signal desired by a user through an input selector and convert the image signal into a displayable image signal on a screen. When a digital video signal is input, the digital video signal is directly input to a digital video processor through a receiver and converted into a video signal that can be displayed on a screen.

As described above, the apparatus and method for controlling selection of an input signal of an LCD monitor according to the present invention implements a variety of images on a screen by selectively receiving analog video signals and digital video signals and processing them into image signals that can be displayed on a screen. At the same time, the user range of the input signal can be expanded.

Claims (4)

delete In the input signal selection control method of the LCD monitor having a first input unit, a second input unit and a receiver, Setting an operation mode according to whether a horizontal / vertical synchronization signal is input from the first input unit when a user selects the first input unit; Determining whether a horizontal / vertical synchronization signal is input from the receiver when the user has not selected the first input unit; When the horizontal / vertical synchronization signal is input from the receiver, processing the digital video signal input from the second input unit as a video signal displayable on the screen and setting the signal to a normal mode; And, And setting an operation mode according to whether the horizontal / vertical synchronization signal is input from the second input unit if the horizontal / vertical synchronization signal is not input from the receiver. Way. The method of claim 2, Setting an operation mode according to whether the horizontal / vertical synchronization signal from the first input unit is input When the horizontal / vertical synchronization signal is input from the first input unit, processing the analog image signal input from the first input unit as a displayable image signal on the screen and setting the signal to a normal mode; And setting a power saving mode after a set time has elapsed if a horizontal / vertical synchronization signal is not input from the first input unit. The method of claim 2, The setting of the operation mode according to whether the horizontal / vertical synchronization signal is input from the second input unit When the horizontal / vertical synchronization signal is input from the second input unit, converting an analog image signal input from the second input unit into a video signal displayable on the screen and setting the normal mode; And setting a power saving mode after a preset time has elapsed if a horizontal / vertical synchronization signal is not input from the second input unit.