KR19990056838A - Screen control device and method at power on / off - Google Patents

Abstract

The present invention relates to an apparatus and a method for controlling a screen when power is turned on / off of a display monitor. The present invention relates to a device for controlling a screen when power is turned on and off of a display monitor. A microcomputer that outputs a second switch signal for turning on / off a power by receiving a signal, and outputs horizontal and vertical size signals and a luminance signal for varying screen size and brightness, and generates the first switch signal And a switch unit for turning on / off power by receiving the second switch signal, so that a user can stably check a process of turning on / off power of the display monitor.

Description

Screen control device and method at power on / off

The present invention relates to an apparatus and a method for controlling a screen during power on / off of a display monitor. Particularly, the present invention relates to a process of displaying a process of powering on / off when a user turns on / off a power of a display monitor. An apparatus and method are provided.

In general, the display monitor receives and displays a video signal generated from a host. At this time, the power is turned on / off to use or stop the display monitor. When the display monitor is powered on / off, the user generally sees the screen without looking at the display device indicating the power on / off. That is, in order to confirm the power on / off, the user first checks the screen to recognize the power on / off. For this reason, it is required to make the process of turning on / off the display monitor by the user more stable and sure.

Accordingly, the present invention provides an apparatus and method for varying the screen size and brightness at the time of power on / off of the display monitor to display on the screen so that the user can recognize the power on / off process of the display monitor more stably and reliably. By providing it.

In order to achieve the above object, the present invention provides a device for controlling a screen when power is turned on or off of a display monitor, the second switch signal being turned on / off by receiving a first switch signal according to power on / off. And a microcomputer for outputting horizontal and vertical size signals and luminance signals for varying the screen size and luminance, and generating the first switch signal and applying the second switch signal to turn on / off power. It is characterized by consisting of a switch unit.

According to another aspect of the present invention, there is provided a method of controlling a screen when power is turned on or off of a display monitor, the method comprising: determining whether power on is selected; It is composed of a step of expanding or increasing step by step, and the step of reducing or decreasing the screen size and the brightness of the raster step by step when the power on is not selected and off is selected in the step.

1 is a block diagram showing the internal circuit configuration of a display monitor to which the screen control device is applied when the power on / off according to the present invention;

2 is a view showing a screen control state according to the present invention;

3 is a state diagram showing screen switching when power on / off according to the present invention;

4 is a flowchart illustrating a sub routine of the screen enlargement step illustrated in FIG. 3;

5 is a flowchart showing a subroutine of the luminance increasing step shown in FIG. 3;

6 is a flowchart showing a subroutine of the screen reduction step shown in FIG. 3;

7 is a flowchart illustrating a subroutine of the luminance reduction step illustrated in FIG. 3.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the screen control apparatus when power on / off according to the present invention receives a first switch signal according to power on / off, outputs a second switch signal for power on / off, and displays a screen size. ) And a microcomputer 11 for outputting horizontal and vertical size signals H / V_SIZE and luminance signals CONTRAST for varying luminance, generating the first switch signal and applying the second switch signal. The switch unit 12 for receiving power on / off and the horizontal and vertical size signals H / V_SIZE output from the microcomputer 11 are applied to convert the digital signal into an analog signal. A digital to analog converter (abbreviated to DAC) 13 to output and an analog horizontal and vertical size signal (H / V_SIZE) output from the DAC 13 are applied and applied. Analog horizontal and vertical size In order to control the screen size displayed on the CRT according to H / V_SIZE, horizontal and vertical deflection circuits 14 for generating a deflection current in the deflection yoke DY, and the luminance signal CONTRAST output from the microcomputer 11. ) And a video preamplifier 15 for amplifying and outputting the raster luminance to a predetermined level according to the applied luminance signal CONTRAST, and from the video preamplifier 14 to a predetermined level. It is composed of a video main amplifier (16) that is amplified and output raster (Raster) is amplified and fully amplified and then applied to the CRT.

Such a method of controlling the device of the present invention may include confirming that power of the display monitor 10 (shown in FIG. 1) is turned on / off, as shown in FIG. 3, and confirming that the power is turned on / off. In step S10, when it is confirmed that the power is turned on / off, a step of determining whether the power is selected is selected (S20) and the step of determining whether the power on is selected (S20). In the step S30 and S40 of increasing the size and the brightness of the raster step by step, and in the step S20 of determining whether to turn on the power, the screen power and the size of the raster are not selected. It consists of the steps (S50, 60) to reduce or decrease the brightness of the raster step by step.

Looking at the present invention having such a configuration in more detail with reference to the accompanying drawings as follows.

The user turns on / off the power supply circuit 17 of the display monitor 10 (S10). That is, the user selects the first switch SW1 of the switch unit 12 for use or after use of the display monitor 10. First, a case in which the user turns on the power supply circuit 17 to use the display monitor 10 will be described. In order to use the display monitor 10, the user turns on the first switch SW1 attached to the front case of the display monitor 10 as shown in FIG. 2. The first switch SW1 turns on / off a wakeup voltage (not shown) supplied to the microcomputer 11. The microcomputer 10 determines whether a first switch signal for turning on the power generated from the first switch SW1 is generated (S20).

As a result, when the first switch signal according to the power-on is applied to the microcomputer 11, a second switch signal for turning on the power is generated and applied to the second switch SW2 of the switch unit 12. The second switch SW2 operates to input AC input from the outside into the power supply circuit 17. That is, as the second switch SW2 is configured as a relay switch, the power supply circuit 17 is turned on according to the second switch signal according to the power-on output from the microcomputer 11. As the power supply circuit 17 is turned on, the power supply circuit 17 supplies various driving voltages required in the display monitor 10.

The microcomputer 11 increases the screen size and increases the brightness at the same time as generating the second switch signal according to the power-on (S30 and S40). That is, when the power is turned on, the screen size is enlarged step by step (S30), and at the same time, the brightness of the raster displayed on the enlarged screen is increased step by step (S40).

More specifically, as shown in FIGS. 4 to 5, in order to enlarge the screen size displayed on the screen of the display monitor 10 step by step, the microcomputer 11 performs the step-by-step of the pre-stored horizontal and vertical size signals H / V_SIZE. Increase the output. The horizontal and vertical size signals H / V_SIZE that are incremented and output in steps are converted from digital to analog through the DAC 13 and output. That is, in order to increase the horizontal and vertical sizes, the DAC level value output through the DAC 13 is increased and output (S31). When the DAC level value is increased and output, it is checked whether the DAC level value is the maximum value displayed at the maximum size on the screen of the display monitor 10 (S32).

When the value of the DAC level is maximum, the maximum screen size III displayed on the screen of the display monitor 10 is obtained as shown in FIG. 2. Therefore, when the maximum DAC level is reached, the screen size is increased, and in the opposite case, the DAC level is increased to increase the screen size step by step (I → II → III). In this way, the horizontal and vertical deflection circuit 14 receives the DAC level value output through the step bell. The horizontal and vertical deflection circuit 14 receives the horizontal and vertical output signals H / V_OUT output from the microcomputer 11 and deflects the deflection yoke DY to increase the screen size according to the applied DAC level value. Occurs in At this time, the horizontal and vertical output signals H / V_OUT output from the microcomputer 11 are generated according to the horizontal and vertical synchronization signals H / V_SYNC received from the host (not shown).

As described above, the screen size is increased step by step, and the brightness of the raster displayed on the screen size of the step is increased (S40). More specifically, the microcomputer 11 increases and outputs the prestored luminance signal CONTRAST step by step in order to increase the luminance of the raster to the step bell (S41). It is checked whether the output luminance signal CONTRAST has reached the maximum value (S42). As a result, the increase in the luminance signal CONTRAST is terminated when the maximum value is reached.

For example, the microcomputer 11 has a low level luminance signal CONTRAST when the screen size is I, and a normal level luminance signal CONTRAST corresponding to the case where the screen sizes are II and III, and a high level. Raster brightness is increased step by step to configure the raster so as to increase with the luminance signal CONTRAST. The luminance signal CONTRAST according to each level is applied by the video preamplifier 15, adjusts the luminance gain of the raster, amplifies it to a predetermined level, and applies it to the video main amplifier 16. The video main amplifier 16 amplifies the raster with the applied brightness gain sufficiently amplified and applied to the CRT for display. That is, when the screen size is I, a raster having low luminance is configured, and in case of II and III, the raster is configured and displayed so as to have normal luminance and high luminance so as to correspond to each.

As such, the process of turning on the power can be stably displayed to the user by configuring and displaying a raster having a brightness distinguished by the screen size and each screen size. Through this process, the display monitor 10 is turned on to process and display the image signals R, G, and B and the horizontal and vertical synchronization signals H / V_SYNC output from the host. When the general operation of displaying the image signals R, G, and B is completed, the user turns off the display monitor 10 again.

When the user selects the first switch SW1 to turn off the display monitor, the first switch SW1 generates the first switch signal according to the power off. The microcomputer 11 receiving the first switch signal according to the power-off generates a second switch signal according to the applied first switch signal. At this time, the microcomputer 11 generates a second switch signal after a predetermined time delay. That is, the display monitor 10 is completely turned off after displaying a process of turning off the power. When the second switch signal is applied to the second switch SW2, the second switch SW2 is configured as a relay switch to block AC from being input to the power path 17.

The screen size displayed on the screen of the display monitor 10 shown in FIG. 2 is reduced in steps (III → II → I) in the reverse order of the on process for a predetermined time until the power supply circuit 17 is completely shut off. In addition, the luminance level is also displayed on each screen size in a reverse order from the high level to the normal level, and then the raster is displayed. That is, the microcomputer 11 reduces or decreases the screen size and brightness step by step according to the first switch signal according to the applied power-off (S50 and S60).

More specifically, in order to reduce the screen size in stages, the horizontal and vertical size signals H / V_SIZE are reduced in stages and output (S50). In order to reduce the screen size step by step, as shown in FIG. 6, the horizontal and vertical size signals H / V_SYNC are reduced step by step in the microcomputer 11 and applied to the DAC 13. The DAC 13 reduces and outputs the DAC level value step by step according to the applied horizontal and vertical size signals H / V_SYNC (S52). Check if the output DAC level value is reduced to the minimum value, and if it is confirmed to the minimum value, complete the reduction of the DAC level value. In addition, the microcomputer 11 decreases the level of the luminance signal CONTRAST step by step and outputs the result (S61). It is checked whether the luminance signal CONTRAST reduced and outputted in steps is a minimum value (S62). If the minimum value, the stepwise reduction of the luminance signal CONTRAST is completed.

When the DAC level value is reduced and output from the DAC 13 step by step, and the luminance signal CONTRAST is reduced and output step by step, it is applied to each of the horizontal and vertical deflection circuits 14 to the video preamplifier 15. . The horizontal and vertical deflection circuits 14 and the video preamplifier 15 display a process of turning off the power according to the applied DAC level value and the luminance signal CONTRAST. The raster is configured and displayed on the screen of the display monitor 10 with the minimum screen size and low luminance, and at the same time, the microcomputer 11 applies the second switch signal to the second switch SW2 to completely cut off the power.

As described above, in the power on / off process of the display monitor 10, the display time may be set differently depending on the programming of the microcomputer 11.

As described above, the present invention provides an effect that the display monitor can more stably check on / off by checking a process of turning on / off the power of the display monitor.

Claims (12)

An apparatus for controlling a screen when a display monitor is powered on / off, The microcomputer outputs a second switch signal for turning on / off the power by receiving the first switch signal according to the power on / off, and outputs a horizontal and vertical size signal and a luminance signal for varying the screen size and brightness. and, And a switch unit generating the first switch signal and receiving the second switch signal to turn on / off power. The method of claim 1, The microcomputer, If the first switch signal is a signal according to power on, the horizontal and vertical size signal and the luminance signal are enlarged or increased in steps, and if the first switch signal is a signal according to power off, the horizontal and vertical size signal and The screen control device when the power on / off, characterized in that for outputting by reducing or decreasing the luminance signal step by step. The method of claim 1, The microcomputer, And outputting after delaying the second switch signal for a predetermined time when the first switch signal is a signal according to power-off. The method of claim 1, The switch unit, A first switch outputting a first switch signal according to power on / off and applying to the microcomputer; And a second switch configured to receive the second switch signal output from the micom according to the first switch signal and to turn on / off power. The method of claim 4, wherein The second switch, And a relay switch configured to turn on / off the input of the commercial AC according to the second switch signal. In the method of controlling the screen when the display monitor is powered off / off, Determining that power on is selected, Increasing or increasing the screen size and the brightness of the raster step by step when the power on is selected; And if the power is not selected in the step and the off is selected, the screen size and the brightness of the raster are reduced or reduced in stages. The method of claim 6, In the step of increasing or increasing the screen size and the brightness of the raster step by step, If power on is selected, increasing the screen size step by step, And increasing the brightness of the raster displayed in the screen step by step while simultaneously expanding the screen size step by step in the step. The method of claim 7, wherein The step of enlarging the screen size step by step, Increasing the horizontal and vertical size DAC values step by step to enlarge the screen size step by step, And determining whether the horizontal and vertical size DAC values are converted to a maximum value that can be increased when the horizontal and vertical size DAC values are increased step by step in the step. The method of claim 7, wherein Increasing the brightness step by step, Increasing the brightness step by step, And checking whether the brightness is increased in stages to reach a maximum value. The method of claim 6, Reducing or decreasing the screen size and the brightness of the raster step by step, If power on is selected, reducing the screen size step by step, And reducing the brightness of the raster displayed in the screen step by step while simultaneously reducing the screen size step by step. The method of claim 10, Reducing the screen size step by step, Reducing the horizontal and vertical size DAC values step by step, And determining whether the horizontal and vertical size DAC values are converted into minimum values that can be reduced when the horizontal and vertical size DAC values are reduced in steps in the step. The method of claim 10, Reducing the brightness step by step, Reducing the brightness step by step, And determining whether or not the brightness is reduced in stages to reach a minimum value.