KR20010060463A - Method and apparatus controlling screen of LCD Monitor - Google Patents

Abstract

The present invention relates to a display device and a method for adjusting an LCD monitor to enable a user to easily set a clock, a clock phase, and a horizontal / vertical position on a window. A PLL for generating a sampling clock signal synchronized with the < RTI ID = 0.0 >), an A / D converter for converting an R / G / B video signal input to the digital R / G / B video signal according to the sampling clock signal, and the A / D A scaler for converting the digital R / G / B image signal converted by the converter into a displayable frame unit on the LCD module and transmitting it according to the signal input timing of the LCD module; and extracting and storing screen adjustment data from the output of the scaler. If the user selects the screen adjustment mode and the R / G / B data interface unit determines whether the output of the R / G / B data interface unit is normal, the PLL, the A / D converter and the scaler are determined. It is configured to include a microcomputer to control the output of the screen that the user can recognize the adjustment state has the effect that it is easier to set the optimal screen state on the window.

Description

Screen control device and method of LCD monitor {Method and apparatus controlling screen of LCD Monitor}

The present invention relates to a monitor, and more particularly, to an apparatus and a method for adjusting a screen of an LCD monitor.

In general, a monitor is a device that displays a video signal of a predetermined format transmitted from an internal video card on a screen through a series of signal processing such as digital sampling and scaling. Starting with a small monitor using a cathode ray tube, the development of modern technology In accordance with the trend toward larger display devices, digital displays using LCDs are commercially available, which are suitable for large monitors.

Hereinafter, a monitor according to the prior art will be described with reference to the accompanying drawings.

1 is a view schematically showing an LCD monitor according to the prior art.

As shown in FIG. 1, the LCD monitor according to the related art recognizes an input video format according to a horizontal / vertical synchronization signal (H-Sync / V-Sync) transmitted from a video card, and displays a display suitable for the corresponding format. A microcomputer (1) for outputting a control signal, a PLL (Phase Locked Loop) (2) for generating a clock pulse for a selected mode according to the control signal of the microcomputer (1), and the PLL (2) An A / D converter 3 for sampling and converting an R / G / B video signal transmitted from a main body according to a clock pulse into a digital signal; and a frame buffer memory for temporarily storing the video signal in units of frames. And the digital R, G, and B video signals output from the A / D converter 3 in frame units displayable on the LCD module 7 according to the control signal of the microcomputer 1. Scale to transmit according to signal input timing of 7) (4), an LCD module (7) for compressing and transmitting the output signal of the scaler (4) and the LCD module (7) for receiving and restoring the compressed signal through the Tx (6) and driving a liquid crystal to display a screen. It is composed of

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

First, the microcomputer 1 determines the resolution of the input video signal when the horizontal / vertical synchronization signal transmitted from the video card is input.

Subsequently, the microcomputer 1 sets the sampling clock of the A / D converter 3 such that the resolution of the input video signal corresponds to the resolution supported by the flat panel display and the resolution set by the user. The control signal is applied to the PLL 2.

The PLL 2 sets a sampling clock for each mode according to a control signal output from the microcomputer 1, and the A / D converter 3 transmits the main body according to a clock pulse supplied from the PLL 2. The analog R, G, and B video signals are sampled and converted into digital R, G, and B video signals.

For example, in the case of an XGA video signal, a 65 MHz sampling clock for sampling the XGA video signal is generated to match the horizontal synchronization signal timing to perform digital sampling, thereby outputting 8-bit digital R, G, and B video signals.

The scaler 4 performs signal processing on a digital R, G, B image signal output from the A / D converter 3 in units of frames according to the control signal of the microcomputer 1, and the frame The buffer memory 5 stores the output of the scaler 4 in units of frames.

The Tx 6 compresses and transmits digital R, G, and B video signals stored in the frame buffer memory 5. The LCD module 7 receives a signal output from the scaler 4 to drive a liquid crystal to display a screen.

To adjust the screen in the LCD monitor configured as described above, there are adjustments of clock, clock phase and horizontal / vertical position. This adjusts the clock, clock phase and horizontal / vertical position on the currently viewed screen.

As described above, the LCD monitor according to the related art has the following problems.

First, it is difficult to set the best clock setting on the actual screen even if the clock is changed according to the screen type during clock adjustment.

Second, it is difficult to set the ideal state except for the special screen when adjusting the clock phase.

Third, when adjusting the horizontal / vertical position, the user cannot know the start and end positions of the left and right lines accurately, the user cannot exactly know the start and end positions of the vertical lines, and the start and end positions of the vertical lines cannot be known correctly.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object thereof is to provide an apparatus and method for adjusting an LCD monitor so that a user can easily set a clock, a clock phase, and a horizontal / vertical position on a window.

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

2 is a block diagram showing an apparatus for adjusting a screen of an LCD monitor according to the present invention.

3 is a waveform diagram showing an embodiment of clock adjustment according to an input signal;

4A and 4B are views illustrating a screen according to clock adjustment of an LCD monitor according to the present invention.

5A and 5B are screens showing horizontal / vertical position adjustment of the LCD monitor according to the present invention.

6 is a flow chart showing a screen adjustment method of the LCD monitor according to the present invention.

Explanation of symbols for main parts of the drawings

11: Micom 12: PLL

13: A / D Converter 14: Scaler

15: frame buffer memory 16: Tx

17: LCD module 18: R / G / B data interface

In accordance with one aspect of the present invention, there is provided a screen adjusting apparatus for an LCD monitor, comprising: a PLL for generating a sampling clock signal synchronized with a received horizontal / vertical synchronization signal (H / V-Sync); An A / D converter for converting an R / G / B video signal input according to a clock signal into a digital R / G / B video signal, and a digital R / G / B video signal converted by the A / D converter A scaler for converting the frame unit into a displayable frame on the LCD module and transmitting it to match the signal input timing of the LCD module, an R / G / B data interface unit for extracting and storing screen adjustment data from the output of the scaler, And extracting data stored in the R / G / B data interface unit to determine whether or not normal data is extracted to control the PLL, the A / D converter and the scaler. It has those features.

According to an aspect of the present invention, there is provided a method for adjusting a screen of an LCD monitor, the method including: changing a state variable according to a button input by a user in an LCD monitor having first to third buttons; According to an aspect of the present invention, the method includes configuring a screen for a corresponding screen adjustment mode and outputting a corresponding adjustment mode description text on the configured screen.

Hereinafter, an apparatus and method for adjusting a screen of an LCD monitor according to the present invention will be described with reference to the accompanying drawings.

2 is a view showing the screen adjustment apparatus of the LCD monitor according to the present invention, Figure 3 is a view showing a waveform diagram of the clock pulse, Figures 4a and 4b, 5a and 5b of the LCD monitor according to the present invention 6 illustrates a screen adjustment screen, and FIG. 6 is a flowchart illustrating a screen adjustment method of the LCD monitor according to the present invention.

As shown in Fig. 2, the LCD monitor adjusting device according to the present invention grasps the input image format according to the horizontal / vertical synchronization signal (H-Sync / V-Sync) transmitted from the video card and fits the format. The microcomputer 11 outputs a control signal for display and outputs a screen adjustment signal according to a user's request, and a PLL (Phase Locked) for generating a clock pulse for a selected mode according to the control signal of the microcomputer 11. Loop) 12, an A / D converter 13 for sampling and converting an R / G / B video signal transmitted from a main body into digital according to a clock pulse supplied from the PLL 12, and converting the video signal. The frame buffer memory 15 for temporarily storing the frame unit and the digital R / G / B video signal output from the A / D converter 13 according to the control signal of the microcomputer 11 are LCD modules. In frame units displayable on (17) A scaler 14 for converting and transmitting the signal according to the signal input timing of the LCD module 17, a Tx 16 for compressing and transmitting the output of the scaler 14, and a signal compressed through the Tx 16. LCD module 17 for restoring and driving the liquid crystal to display a screen, and an R / G / B data interface 18 for receiving the output of the scaler 14 and feeding it back to the microcomputer 11. .

Referring to the operation of the screen adjustment device of the LCD monitor configured as described above in detail.

First, the microcomputer 1 determines the resolution of the input video signal when the horizontal / vertical synchronization signal transmitted from the video card is input.

Subsequently, the microcomputer 1 sets the sampling clock of the A / D converter 3 such that the resolution of the input video signal corresponds to the resolution supported by the flat panel display and the resolution set by the user. In order to apply the control signal to the PLL (2).

The PLL 2 sets a sampling clock for each mode according to a control signal output from the microcomputer 1, and the A / D converter 3 transmits the main body according to a clock pulse supplied from the PLL 2. The analog R, G, and B video signals are sampled and converted into digital R, G, and B video signals.

For example, in the case of an XGA video signal, a 65 MHz sampling clock for sampling the XGA video signal is generated to match the horizontal synchronization signal timing to perform digital sampling, thereby outputting 8-bit digital R, G, and B video signals.

The scaler 4 performs signal processing on a digital R, G, B image signal output from the A / D converter 3 in units of frames according to the control signal of the microcomputer 1, and the frame The buffer memory 5 stores the output of the scaler 4 in units of frames.

The Tx 6 compresses and transmits digital R, G, and B video signals stored in the frame buffer memory 5. The LCD module 7 receives a signal output from the scaler 4 to drive a liquid crystal to display a screen.

In addition, the R / G / B data interface 18 receives a digital R / G / B image signal output from the scaler 14 and feeds it back to the microcomputer 11, and the microcomputer 11 receives the digital feedback. It determines whether the clock, clock phase and horizontal / vertical position are set properly by receiving the R / G / B video signal.

First, the clock adjustment mode is to provide a reference frequency of the A / D converter 13 and is generated by the PLL 12 and varies the number of clocks generated in one horizontal period so that the A / D converter ( 13) is a method of setting the clock value that can operate most accurately. When the user selects the clock adjustment mode, the white line and the black line repeatedly output the screen as shown in FIG. 4A.

Meanwhile, as shown in FIG. 3, when the user changes the clock, a gray line is added in addition to the white line and the black line as shown in FIG. 4B, and the microcomputer 11 has an R / G / B data interface. It is possible to determine whether an error of clock generation occurs based on whether the black / white is repeatedly outputted or the gray lines are mixed correctly.

In addition, the clock phase adjustment mode is operated at a specific position of the clock inputted to the A / D converter 13 after the clock is set correctly, and the R / G / B input signal and the sampling position of the clock do not coincide correctly. If not, this mode adjusts clock phase.

That is, as shown in Fig. 3, the phase adjustment is to adjust the delay time, that is, the phase difference with respect to the original video signal in a state where the number of original clocks is set to 800 accurately during one horizontal period.

When sampling at the correct position, such as the original clock source, the output is in the order of black and white, as shown in FIG. 4A. However, when accurate sampling is not performed, the result values of gray, not black and white, as shown in FIG. Is output.

Therefore, as in the clock adjustment mode, the microcomputer 11 extracts a horizontal line through the R / G / B data interface unit 18 to determine whether the correct phase is set according to whether black and white values are regularly output. Will be judged.

On the other hand, the screen configuration of the horizontal / vertical position adjustment mode, as shown in Figure 5a, only the first line and the last line of the horizontal line is displayed by one line with white lines, only the first line and the last line is the same line A specific video pattern, indicated by, is input.

That is, when the user adjusts the horizontal / vertical position, the start line and the end line of each of the horizontal and vertical lines of the video pattern are displayed and disappeared.

First, as shown in FIG. 5B, when the horizontal position is shifted to the left, the first vertical line is not displayed, and the end vertical line appears on the right part of the screen, and when the horizontal position is shifted to the right, the first vertical line is reversed. It is displayed on the left side of the screen and the end vertical line is not displayed. Therefore, when the horizontal position is correct, both the first vertical line and the end vertical line are correctly displayed.

In the same way, if the vertical position is correct, both the first horizontal line and the last horizontal line will be displayed correctly.

Therefore, when the user changes the horizontal / vertical position, the microcomputer 11 changes the value of the scaler 14 to perform horizontal / vertical movement, and the changed data is transmitted to the R / G / B data interface unit ( 18) is used to read the beginning and end of the horizontal and vertical lines. That is, the white signal must be displayed on the first and last lines, and the correct position is set when the R / G / B data signal displays a value of 255.

The screen adjustment method of the LCD monitor configured as described above will be described with reference to FIG. 3.

Referring to FIG. 3, first, it is determined whether a screen adjustment mode is selected (S1).

Subsequently, when the screen adjustment mode is selected as a result of the determination (S1), it is determined whether a first button ('Exit' button) is input (S2).

As a result of the determination (S2), when the first button ('Exit' button) is input, the screen returns to the original screen (S3).

On the other hand, if the determination result (S2), the first button ('Exit' button) is not input, the window state value (Counter) is changed according to the input button (S4).

In the screen adjustment mode, an initial screen for clock, clock phase, and horizontal / vertical position adjustment is configured (S5).

Subsequently, it is determined whether the changed state variable Counter is '0' (S6).

As a result of the determination (S6), when the changed state variable (Counter) is '0', a description is given of configuring a screen for the clock adjustment mode, outputting a title indicating the clock adjustment mode, and adjusting the clock adjustment mode. The phrase is output (S7).

On the other hand, if it is determined in step S6 that the changed state variable Counter is not '0', it is determined whether the state variable Counter is '1' (S8).

Subsequently, when the determination result S8 indicates that the changed state variable Counter is '1', a screen for the clock phase adjustment mode is configured, a title indicating the phase adjustment mode is output, and the adjustment method of the phase adjustment mode is explained. A description sentence is output (S9).

On the other hand, if it is determined in step S8 that the changed state variable Counter is not '1', it is determined whether the state variable Counter is '2' (S10).

As a result of the determination (S10), when the changed state variable (Counter) is '2', a screen for the horizontal / vertical position adjustment mode is configured, a title indicating the horizontal / vertical position adjustment mode is output, and the horizontal / vertical position is displayed. An explanation sentence for explaining the adjustment method of the adjustment mode is output (S11).

As described above, the screen adjusting apparatus and method of the LCD monitor according to the present invention is optimal by operating in the order of clock adjustment mode, clock phase adjustment mode, horizontal / vertical position adjustment mode when the screen adjustment mode is selected according to a user's request. You can set the screen status.

As described above, the screen adjusting apparatus and method of the LCD monitor according to the present invention outputs a screen that allows the user to recognize the user's adjustment status when the user selects the screen adjustment mode. There is.

Claims (8)

In the monitor, A PLL for generating a sampling clock signal synchronized with a received horizontal / vertical synchronization signal (H / V-Sync); An A / D converter for converting an R / G / B video signal input according to the sampling clock signal into a digital R / G / B video signal; A scaler for converting the digital R / G / B image signal converted by the A / D converter into a frame unit that can be displayed on the LCD module and transmitting the frame to match the signal input timing of the LCD module; An R / G / B data interface unit for extracting and adjusting screen adjustment data from an output of the scaler; And, When the user selects the screen adjustment mode, the LCD monitor, characterized in that it comprises a microcomputer to control the PLL, A / D converter and scaler by determining whether the output of the R / G / B data interface unit normal Device. In the LCD monitor with first to third buttons for adjusting the screen state, Changing a state variable according to a button input by a user; Constructing a screen for a corresponding screen adjustment mode according to the changed state variable; And, And outputting a corresponding adjustment mode description text on the configured screen. The method of claim 2, The step of changing the state variable When the user inputs the first button, returning to the original screen; Decreasing a state value of a current window when a user inputs the second button; And when the user inputs the third button, increasing the state value of the current window. The method of claim 2, Configuring a screen for the corresponding screen adjustment mode Configuring an initial screen of the screen adjustment mode; And configuring a screen for adjusting a clock, phase, and horizontal / vertical position according to a button input by a user on the initial screen. The method of claim 4, wherein Configuring the initial screen is Measuring the width and height of the screen, Blacking the background color of the screen, And adjusting the coordinate position to the initial position (0,0). The method of claim 4, wherein Comprising the screen adjustment screen according to the state variable Configuring the clock adjustment screen when the state variable is '0'; Configuring the clock phase adjusting screen when the state variable is '1'; If the state variable is '2', forming a horizontal / vertical position adjustment screen. The method of claim 6, Configuring the clock adjustment and clock phase adjustment screen And displaying white on odd vertical lines and black on even vertical lines. The method of claim 2, The step of outputting the corresponding adjustment mode description sentence is Outputting a title indicating each corresponding adjustment mode; And a step of outputting an explanatory text indicating an adjustment method of each corresponding adjustment mode.