KR20010091233A - Apparatus for controlling brightness of monitor - Google Patents

Abstract

PURPOSE: An apparatus for controlling a luminance of a monitor is provided to increase a luminance of whole screen by amplifying a video signal after overlaying a horizontal/vertical fly-back pulse with a contrast signal, and then overlaying the video signal with the overlaid signal. CONSTITUTION: A PC(10) transmits a R/G/B video signal or a moving picture signal. A microcomputer senses the video signal transmitted from the PC(10) and controls it so that a square wave pulse or a horizontal/vertical fly-back pulse is selected according to the relevant video signal. When the moving picture signal is inputted from the PC(10), an image signal processor(20) senses moving picture signal and generates the square wave pulse, and it overlays the generated square wave pulse through a predetermined signal process to the contrast signal inputted from the outside, and outputs it. A first amplifying unit(30) performs a first amplification of the video signal after overlaying it transmitted from the PC(10) to the contrast signal or performs a first amplification of the output of the image processor(20) . A second amplifying unit(40) performs a second amplification by being inputted the signal(V1) amplified from the first amplifying unit(30). A CRT(cathode ray tube)(50) is inputted the signal amplified from the second amplifying unit(40) into a cathode end and outputs it to the screen.

Description

Apparatus for controlling brightness of monitor}

TECHNICAL FIELD The present invention relates to a monitor, and more particularly, to an apparatus for controlling brightness of a monitor.

In general, the monitor is a series of signals to the video signal of the video mode such as SVGA (800 × 600), XGA (1024 × 768), SXGA (1280 × 1024) transmitted from the video card of the PC or workstation connected It is a device that displays on the screen after processing.

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

1 is a view showing the configuration of a brightness control device of a monitor according to the prior art.

As shown in FIG. 1, a brightness control apparatus for a monitor according to the prior art includes a PC 1 for transmitting an image signal and an image transmitted from the PC 1 to a contrast signal output from a main board (not shown). A first amplifier 2 for superimposing the signals and performing first amplification; and a second amplifier 3 for amplifying the output of the first amplifier 2 and outputting the second amplification to the CRT 4. do. In this case, the first amplifier 2 is a pre-amp and the second amplifier 3 is a main amplifier.

Referring to the operation of the brightness control device of the monitor according to the prior art configured as described in detail as follows.

First, the video signal transmitted from the PC 1 is applied to the first amplifier 2 through a cable line, and then the first amplifier 2 receives the video signal input from the PC 1 into the main board. It superimposes on the contrast signal output from (not shown), and outputs the 1st amplified signal V1.

Subsequently, the signal V1 amplified by the first amplifier 2 is input to the second amplifier 3 to perform secondary amplification and output the amplified signal V2 to the cathode terminal of the CRT 4. do.

As described above, the brightness control apparatus of the monitor according to the related art may determine that the brightness of the screen is determined according to the level of the amplified image signal.

As described above, the brightness control apparatus of the monitor according to the prior art has a problem in that the brightness on the screen is lowered because the original signal level is low even when amplifying when a video signal having a low signal level is transmitted from the PC.

Therefore, the present invention has been made to solve the above problems, the brightness control device of the monitor so that the brightness of the screen can be increased by amplifying and outputting the signal level above a certain signal level when the video signal is transmitted from the PC The purpose is to provide.

1 is a block diagram showing the configuration of a brightness control apparatus for a monitor according to the prior art;

2 is a diagram showing the configuration of a brightness control apparatus for a monitor according to the present invention;

3 is a circuit diagram illustrating in more detail the luminance control device of the monitor shown in FIG.

4A to 4D are waveform diagrams showing the output of each unit according to the first embodiment of the brightness control apparatus of the monitor according to the present invention.

5A to 5D are waveform diagrams showing the output of each unit according to the second embodiment of the brightness control apparatus of the monitor according to the present invention.

Explanation of symbols for main parts of the drawings

10: PC 20: video signal processing unit

21: square wave generator 22: switching unit

23: inversion portion 24: overlapping portion

25: voltage section 30: first amplifier section

40: second amplifier 50: CRT

In accordance with an aspect of the present invention, a brightness control apparatus for a monitor according to an embodiment of the present invention monitors an image signal transmitted from a PC and controls a square wave pulse or a horizontal / vertical flyback pulse to be selected according to the image signal. A video signal processor for superposing a micom, a square wave pulse selected by the control of the microcomputer, or a horizontal / vertical flyback pulse superimposed on a contrast signal, and outputting the superimposed signal to the video signal transmitted from the PC; And a first amplifier for performing amplification and a second amplifier for amplifying the signals firstly amplified by the first amplifier and inputting them to the cathode of the monitor.

Hereinafter, the brightness control device of the monitor according to the present invention with reference to the accompanying drawings in more detail.

2 is a view showing a schematic configuration of the brightness control apparatus of the monitor according to the present invention, Figure 3 is a circuit diagram showing the configuration of the brightness control apparatus of the monitor according to the present invention in detail.

As shown in FIG. 2, the brightness control apparatus of the monitor according to the present invention senses a PC 10 transmitting an R / G / B video signal or a video signal and a video signal transmitted from the PC 10. A microcomputer (not shown) for controlling a square wave pulse or a horizontal / vertical flyback pulse to be selected according to the video signal, and detecting a video signal from the PC 10 to generate a square wave pulse. Is superimposed on the contrast signal input from the outside through a predetermined signal processing and the video signal processor 20 and the video signal transmitted from the PC 10 on the contrast signal to amplify the first, or the video signal The first amplifier 30 receives the output of the processor 20 to perform the first amplification, and the second amplifier receives the signal V1 amplified by the first amplifier 30 and performs the second amplification. Amplification The unit 40 and the CRT 50 for receiving the signal amplified by the second amplifying unit 40 to the cathode terminal and outputting it on the screen.

Herein, the configuration of the video signal processor 20 will be described with reference to FIG. 3.

As shown in FIG. 3, the video signal processing unit 20 detects a video signal transmitted from the PC 10 and detects the video signal, and the same position in the horizontal / vertical period of the video signal corresponding to the point where the video is displayed on the screen. A square wave generator 21 for generating a square wave pulse Va in the horizontal direction and a horizontal wave output from the square wave pulse output from the square wave generator 21 or a main board (not shown) according to a control signal of a microcomputer (not shown). And a switching unit 22 for selecting one of the vertical flyback signals, an inverting unit 23 for inverting and outputting a phase of the signal output from the switching unit 22, and an inverting unit in the inverting unit 23. The superimposed signal is superimposed on the contrast signal input from the main board (not shown), and is output to the first amplifier 30 and a voltage unit for applying a driving voltage to the inverting unit 23 ( 25).

In this case, the switching unit 22 receives a control signal of a microcomputer (not shown) as a base and is connected to a first transistor Q1 in which driving is determined and a first transistor connected in parallel to the collector of the first transistor Q1. The output of the square wave generator 21 or the main board (not shown) is connected to the resistor R1 and to the collector of the first transistor Q1 according to whether the first transistor Q1 is driven. It is composed of a switch (S / W1) for.

The inverting unit 23 passes through a first capacitor C1 and a second resistor R2 connected in parallel to the switch S / W1, and the first capacitor C1 and a second resistor R2. A third transistor (Q3) for receiving a signal to be received as a base, and inverting the third signal; a third resistor (R3) connected to a collector of the third transistor (Q3); a collector of the third transistor (Q3); One end is connected to the connection portion of the third resistor (R3), the other end is composed of a fourth resistor (R4) is connected to the ground, and the second capacitor (C2), one end is connected to the fourth resistor (R4).

The overlapping part 24 receives a conventional contrast (DC voltage) signal input from a main board (not shown) as a base, and determines whether to drive the fourth transistor Q4 and the Emmy of the fourth transistor Q4. One end is connected to the rotor, and the other end is composed of a fifth resistor R5 grounded.

The voltage unit 25 receives a enable signal input from the outside as a base and is connected to the second transistor Q2 and the base of the second transistor Q2 which is determined to be driven or driven in series. The sixth resistor R6, the third capacitor C3 and the seventh resistor R7 connected in series to the base of the second transistor Q2 in parallel, and the third resistor R3 are connected to the second transistor. It is connected to the emitter of Q2), one end is connected to the corresponding connection portion and the other end is composed of a fourth capacitor (C4) is grounded.

The operation of the brightness control device of the monitor configured as described above is as follows.

First, the video signal transmitted from the PC 10 is simultaneously input to the first amplifier 30 and the video signal processor 20.

If the video signal is output from the PC 10, the square wave generator 21 in the video signal processor 20 detects a video signal input and the video signal is input at the same position as that on the monitor screen. Generate a square wave signal.

In addition, the switching unit 22 outputs a low signal at a microcomputer (not shown) to increase the luminance of a specific portion on the screen according to a user's request to the base of the first transistor Q1. Since the first transistor Q1 is turned off, the switch S / W1 switches the square wave pulse generated by the square wave generator 21.

In addition, when a user wants to increase the brightness of the entire screen, a high signal is output from the microcomputer (not shown) and applied to the base of the first transistor Q1. Q1) is turned on to switch the horizontal / vertical flyback signal input from the main board (not shown).

Accordingly, when the microcomputer (not shown) inputs a video signal or increases the luminance of a specific part of the screen according to a user's request, the microcomputer applies a low signal to the base of the first transistor Q1. Selecting a square wave pulse increases the luminance of a specific portion where the video signal will be displayed on the monitor.

In addition, when a still image signal is input or a user desires to increase the brightness of the entire screen, a high / low signal is output from the microcomputer (not shown) to output from the main board (not shown). Switching the flyback signal increases the brightness of the entire portion of the monitor screen.

As described above, when the square wave signal Va is switched by the switching unit 22, the inverting unit 23 receives the square wave signal Va and increases the first capacitor C1 and the second resistance ( The signal is input to the base of the third transistor Q3 via R2), and the corresponding signal is inverted and output by the third transistor Q3.

Here, when the enable signal applied to the base of the second transistor Q2 is 'high', the voltage transistor 25 turns on the second transistor Q2 to turn on the third of the inverter 23. The driving voltage is applied to the collector of the transistor Q3, and when it is 'low', the driving voltage is turned off to stop the driving of the inverting unit 23.

On the other hand, the enable signal applied to the base of the second transistor (Q2) can be implemented as a switch capable of 12V switch that the user (User) can be adjusted from the outside.

Subsequently, when the contrast signal is input from the main board (not shown), the fourth transistor Q4 of the overlapping part 24 outputs a DC voltage, and the DC voltage is output by overlapping with the output signal of the inverting part 23. .

When the video signal is input, the first amplifier 30 superimposes the video signal transmitted from the PC 10 with the contrast signal and amplifies the video signal in the same manner as the conventional method. The output signal V0 of the video signal processor 20 is first amplified.

Subsequently, the signal amplified by the first amplifying unit 30 is output to the second amplifying unit 40 to perform a second amplification and is input to the cathode of the CRT 50.

Example 1

An embodiment of a method of increasing the luminance of a specific portion on a monitor screen when a video signal is input in the brightness control apparatus of the monitor according to the present invention using the above method will be described with reference to FIGS. 4A to 4D. .

First, when a video signal is input from the PC 10, the square wave generator 21 outputs a square wave pulse Va as shown in FIG. 4A. If the luminance control of a specific portion on the monitor screen is set according to a user's request, the microcomputer Since the low signal is output (not shown), the square wave pulse Va output from the square wave generator 21 is selected to overlap the contrast signal input from the main board (not shown) as shown in FIG. 4B. Outputs (V0).

The superimposed signal V0 is inputted to the first amplifier 30 and superimposed with the R / G / B video signal input from the PC 10 to firstly amplify the waveform V1 as shown in FIG. 4C. The signal amplified by the first amplification unit 30 is input to the second amplification unit 40 to perform a second amplification to output a waveform V2 as shown in FIG. 4D.

Therefore, the square wave pulses carried in the contrast signal are amplified together with the image R / G / B signal to increase the R / G / B image signal level at the position where the moving image is displayed and at the same time increase the luminance.

Example 2

Meanwhile, an embodiment of a method for increasing the brightness of the entire monitor screen when a video signal is input in the brightness control apparatus of the monitor according to the present invention using the above method will be described with reference to FIGS. 5A to 5D. .

On the other hand, when the user wants to increase the brightness of the entire screen, a high signal is output from the microcomputer (not shown), the switch (S / W1) as shown in Figure 5a the main board (shown) Selects the horizontal and vertical flyback pulses.

Subsequently, the inversion unit 23 receives a horizontal / vertical flyback pulse and superimposes the contrast signal input from the main board (not shown) to output a waveform V0 as shown in FIG. 5B to the first amplifier 30. .

The first amplifier 30 receiving the waveform as shown in FIG. 5B superimposes the first R / G / B image signal transmitted from the PC 10 and amplifies the waveform V1 as shown in FIG. 5C. The second amplifier 40 receives the second amplification and outputs the waveform V2 as shown in FIG. 5D to the cathode of the CRT 50.

Therefore, when the horizontal / vertical flyback pulse is loaded on the contrast signal and subjected to the first and second amplification, the entire active section of the horizontal / vertical period of the R / G / B video signal except the blanking section is not specified. Since the signal level is increased, the brightness of the entire screen is brightened. This method can be applied to both a video signal and a still image signal.

As described above, the brightness control apparatus of the monitor according to the present invention is to amplify the video signal level transmitted from the PC by more than the reference brightness level of the monitor to increase the brightness of not only a specific portion of the monitor screen but also the entire portion.

As described above, the brightness control apparatus of the monitor according to the present invention has the following effects.

First, the luminance of a specific region on the screen can be selectively increased by superimposing a square wave pulse on the contrast signal and amplifying the superimposed video signal on the overlapped signal.

Second, the brightness of the entire screen can be increased by superimposing a horizontal / vertical flyback pulse on the contrast signal and amplifying the superimposed video signal on the overlapped signal.

Third, the luminance of a specific portion of the screen or the entire screen may be selectively controlled according to a user's request.

Claims (6)

In the monitor, A microcomputer that senses an image signal transmitted from a PC and outputs a control signal to select a square wave pulse or a horizontal / vertical flyback pulse according to the image signal; A moving picture signal processing unit outputting a square wave pulse or a horizontal / vertical flyback pulse selected according to the control signal of the microcomputer by superimposing it on a contrast signal; A first amplifier for performing first-order amplification by superimposing the video signal transmitted from the PC on the output of the video signal processor; And, And a second amplifier configured to secondly amplify the first amplified signal from the first amplifier and input the second amplified signal to the cathode of the monitor. The method of claim 1, The video signal processor A square wave generator for detecting a change in an image signal transmitted from the PC and outputting a square wave pulse; A switching unit for selecting any one of a square wave pulse generated by the square wave generator and a horizontal / vertical flyback signal input from the outside according to the control signal of the microcomputer; An inverting unit inverting and outputting a phase of the signal selected by the switching unit; An overlapping portion for superposing the output of the inverting portion on a contrast signal, and And a voltage unit configured to apply a driving voltage to the inversion unit according to the control signal of the microcomputer. The method of claim 2, The switching unit A first transistor configured to be driven according to the control signal of the microcomputer; A first resistor connected to the collector of the first transistor, A switch connected to the collector of the first transistor and configured to select a square wave pulse or a horizontal / vertical flyback pulse output from the square wave generator according to whether the first transistor is driven or not; Device. The method of claim 2 or 3, The inversion unit A first capacitor and a second resistor connected in parallel to the switch; A third transistor which receives the signal passing through the first capacitor and the second resistor as a base and inverts and outputs the signal; A third resistor connected to the collector of the third transistor, A fourth resistor having one end connected to a connection portion between the collector of the third transistor and the third resistor and the other end grounded; And a second capacitor having one end connected to the fourth resistor. The method of claim 2, The voltage unit A second transistor configured to receive an enable signal as a base and determine whether to drive; A sixth resistor connected in series with the base of the second transistor; A third capacitor and a seventh resistor connected to the base of the second transistor in parallel; And a fourth capacitor having one end connected to the emitter of the second transistor and one end connected to the ground. The method of claim 2, The overlap portion A fourth transistor configured to receive the contrast signal from the outside as a base and determine whether to drive the same; And a fifth resistor having one end connected to the emitter of the fourth transistor and one end connected to the ground.