KR970004870Y1 - Display unit of power management status on power saving monitor - Google Patents

Abstract

None.

Description

Power Management Status Display Circuit in Power-Saving Monitors

1 is a circuit diagram showing a power management status in a conventional power saving monitor.

2 is a circuit diagram showing a power management status in a power saving monitor according to the present invention.

3 is a table showing a driving state of the display element of FIG.

* Explanation of symbols for main parts of the drawings

H-Sync: Horizontal Sync Signal V-Sync: Vertical Sync Signal

R1-R13: resistor Q1-Q5: transistor

LED1-LED4: Light Emitting Diode MB1, MB2: Multi Vibrator

D1-D4: Diode C1-C3: Capacitor

The present invention relates to a power management status display circuit in a display power management signaling (DPMS) monitor, and more specifically, to display power management statuses corresponding to the usage status of a computer system. The present invention relates to a power management status display circuit in a power saving type monitor that displays each of the power management states easily by using an LED (Emitted Diode).

Here, the DPMS is a function that can save power by managing the power of the monitor, which is a computer peripheral device, in response to the use state of the computer system, and is proposed by the United States Video Electronics Standards Association (VESA).

That is, according to the VESA proposal, the computer selectively supplies or blocks the horizontal synchronizing signal and the vertical synchronizing signal to the monitor in order to realize different power management states in response to the use state of the computer system, and the monitor provides the horizontal synchronizing signal from the computer. And a power management state corresponding to a state in which the vertical synchronization signal is input.

In this case, the power management state is divided into a normal state, a standby state, a standby state, a suspend state, and a power off state.

Here, in the steady state, both pulse outputs of the horizontal synchronization signal and the vertical synchronization signal appear, and in the standby state, only the pulse output of the vertical synchronization signal appears. In addition, in the suspend state, only the pulse output of the horizontal synchronizing signal appears, and in the power off state, neither the horizontal synchronizing signal nor the pulse output of the vertical synchronizing signal appears.

These power management states sequentially transition from a normal state to a standby state to a suspend state and a power off state in response to the continuous passage of time when the computer system is not in use.

At this time, in order to facilitate the user's convenience, the respective power management states can be displayed by displaying the LED color from the outside.

1 is a circuit diagram of a power management state display in such a conventional economy type monitor.

Referring to FIG. 1, the computer selectively supplies or cuts off the horizontal synchronizing signal and the vertical synchronizing signal to the microcomputer 10 of the monitor in order to realize different power management states in response to the use state of the computer system. In operation 10), high and low toggle signals are output to the transistor Q1 at high, low, or predetermined intervals in accordance with the horizontal and vertical synchronization signals input from the computer.

At this time, the collector terminal of the transistor Q1 is connected to the LED (LED1) of two colors (for example, green, yellowish brown) in parallel with the 24V line through the resistor (R1) and the diode (D1).

Accordingly, the LED LED1 is turned on and then turned yellowish brown by turning on / off the transistor Q1. In addition, when the transistor Q1 toggles turn on / off, green and yellow brown repeatedly blink on and off.

However, FIG. 1 shows two power management states by using two LEDs, so that different power management states are not accurately distinguished when performing DPMS functions. LED control is possible only by the signal controlled by the, so there was a problem that can not be applied to some common circuits.

This invention is to solve the above problems, the purpose of this invention is to determine the corresponding power management state according to whether the horizontal and vertical synchronization signal input, and the power management state to the outside using four LEDs The present invention provides a power management status display circuit in a power saving monitor in which a simple circuit configuration is compatible with some commonly used circuits and facilitates external identification of different power management states.

A feature of the power management status display circuit in the power saving monitor according to the present invention for achieving the above object is a synchronization discrimination that checks whether a horizontal synchronization signal and a vertical synchronization signal are input and determines a corresponding power management state. Means and display means for turning on / off in accordance with the power management state determined by the synchronization determining means, and displaying means for notifying the determined power management state to the outside.

Hereinafter, a preferred embodiment of a power management state display circuit in a power saving monitor according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a power management status display circuit diagram in the power saving monitor according to the present invention.

2, the A input terminal of the first multi-vibrator MB1 is connected to the collector terminal of the inverter transistor Q1 which is inverted and outputted when the horizontal synchronization signal H-Sync is input.

At this time, since the B input terminal of the first multi-vibrator MB1 is connected to the A input terminal through the resistor R2 and simultaneously to the power supply terminal Vcc, a high signal is always input to the B input terminal.

The clear terminal and the power supply terminal of the first multivibrator MB1 are also connected to the main power supply terminal Vcc, and the time constant elements C1 and R3 for controlling the output time of the multivibrator are also connected to the power supply terminal Vcc.

At this time, the first LED (LED1) is connected to the power supply terminal (Vcc) always maintains the on state unless the main power is off.

In addition, the output terminal Q of the first multi-vibrator MB1 is connected to the base terminal of the transistor Q2 through the diode D1 and the resistor R4, and the second LED is connected to the collector terminal of the transistor Q2. (LED2) is connected.

On the other hand, when the vertical synchronization signal V-Sync is input, the A input terminal of the second multivibrator MB2 is connected to the collector terminal of the inverter transistor Q2 which is inverted and output.

At this time, since the B input terminal of the second multivibrator MB2 is connected to the A input terminal through the resistor R8 and simultaneously to the power supply terminal Vcc, a high signal is always input to the B input terminal.

The clear terminal and the power supply terminal of the second multivibrator MB2 are also connected to the main power supply terminal Vcc, and the time constant elements C2 and R9 controlling the output time of the multivibrator are also connected to the power supply terminal Vcc.

That is, the time constant elements C1 and R3 of the first multivibrator MB1 adjust the on / off time of the second LED LED2 and the time constant elements C2 and R9 of the second multivibrator MB2. ) Adjusts the on / off time of the third LED (LED3).

The output terminal Q of the second multivibrator MB2 is connected to the base terminal of the transistor Q4 through the diode D2 and the resistor R10, and a third LED is connected to the collector terminal of the transistor Q4. (LED3) is connected.

Meanwhile, a base terminal of the transistor Q5 is connected to the inverting output terminal Q of the first and second multivibrators MB2 through a diode D3, a resistor R12, and a capacitor C3 in common. The fourth LED LED4 is connected to the collector terminal of the transistor Q5 in parallel with the power supply terminal Vcc through a resistor R13 and a diode D4.

This scheme configured in this way maintains the first LED LED1 always lit through the resistor R6 unless the main power supply Vcc is turned off.

Next, the power management states of the four steps will be described in sequence.

1) steady state

In the steady state, since the pulse waveforms of both the horizontal sync signal (H-Sync) and the vertical sync signal (V-Sync) are shown, the transistors Q1 and Q3 are connected to the horizontal and vertical sync signals (H-Sync and V-Sync). The inversion is made to output to the A input terminals of the first and second multivibrators MB1 and MB2, and the output Q of the first and second multivibrators MB1 and MB2 becomes high.

At this time, since the output Q of the first multi-vibrator MB1 is high, a high signal through the diode D1 and the bias resistor R4 turns on the transistor Q2 to turn on the second LED LED2.

In addition, since the output Q of the second multivibrator MB2 is also high, a high signal through the diode D2 and the bias resistor R10 turns on the transistor Q4 to turn on the third LED LED3.

In addition, since the inverting outputs Q of the first and second multivibrators MB1 and MB2 are low, the transistor Q5 is turned off, and thus, the main power supply Vcc is connected to the fourth LED through the resistor R13. Turn on (LED4).

Therefore, in the normal state, all of the first to fourth LEDs LED1 to LED4 are turned on as in the third degree.

ii) standby state

In the standby state, since the pulse waveform of the horizontal synchronization signal H-Sync does not appear and only the pulse waveform of the vertical synchronization signal V-Sync appears, the output of the transistor Q1 is low and the output of the first multivibrator MB1 ( Q) also goes low.

When the output Q of the first multi-vibrator MB1 is low, the transistor Q2 is turned off, so the second LED LED2 is turned off.

On the other hand, since the pulse waveform of the vertical synchronizing signal V-Sync appears, the transistor Q3 inverts the vertical synchronizing signal V-Sync and outputs it to the A input terminal of the second multivibrator MB2, and the second multi The output Q of the vibrator MB2 goes high.

Since the output Q of the second multivibrator MB2 is high, a high signal through the diode D2 and the bias resistor R10 turns on the transistor Q4 to turn on the third LED LED3.

In addition, when the output Q of the first multi-vibrator MB1 is changed from high to low, the inverting output Q is changed from low to high, so that the transistor Q5 is formed by the diode D3 and the resistor R12. Is turned on.

When the transistor Q5 is turned on, since the low signal is applied to the anode of the fourth LED LED4, the 4 LEDs LED4 are turned off.

Therefore, in the standby state, the first and third LEDs LED1 and LED3 are turned on as in the third degree, and both the second and fourth LEDs LED2 and LED4 are turned off.

iii) suspend status

In the suspend state, the pulse waveform of the horizontal synchronizing signal (H-Sync) appears but the pulse waveform of the vertical synchronizing signal (V-Sync) does not appear. Therefore, the transistor Q1 inverts the horizontal synchronizing signal (H-Sync). It outputs to the A input terminal of one multivibrator MB1, and the output Q of 1st multivibrator MB1 becomes high.

At this time, when the output Q of the first multi-vibrator MB1 is high, a high signal through the diode D1 and the bias resistor R4 turns on the transistor Q2 to turn on the second LED ELD2.

On the other hand, since there is no pulse waveform of the vertical synchronization signal V-Sync, the output of the transistor Q3 is low. If the output of the transistor Q3 is low, the output Q of the second multivibrator MB2 is also low. do.

When the output Q of the second multivibrator MB2 is low, the transistor Q4 is turned off, so the third LED LED3 is turned off.

In addition, when the output Q of the second multivibrator MB2 is changed from high to low, the inversion output Q is changed from low to high, so that the transistor Q5 is turned on by the diode D3 and the resistor R12. Is turned on.

When the transistor Q5 is turned on, since the low signal is applied to the anode of the fourth LED LED4, the fourth LED LED4 is turned off.

Therefore, in the suspended state, the first and second LEDs LED1 and LED2 are turned on as in the third degree, and both the third and fourth LEDs LED3 and LED4 are turned off.

iv) power off state

In the power-off state, the pulse waveforms of both the horizontal and vertical sync signals do not appear.

Therefore, the outputs of the transistors Q1 and Q3 go low, and the outputs Q of the first and second multivibrators MB1 and MB2 also go low.

At this time, if the output Q of the first multi-vibrator MB1 is low, the transistor Q2 is turned off to turn off the second LED LED2, and if the output Q of the second multi-vibrator MB2 is low, Transistor Q4 is turned off to turn off third LED LED3.

In addition, since the outputs Q of the first and second multivibrators MB1 and MB2 are low, the inverted output Q becomes high. Therefore, transistor Q5 is turned on by diode D3 and resistor R12. When the transistor Q5 is turned on, since the low signal is applied to the anode of the fourth LED LED4, the fourth LED LED4 is turned off.

At this time, the condenser C3 delays the fourth LED (LED4) when there are no horizontal and vertical synchronization signals (H-Sync, V-Sync), thereby facilitating four-step LED control.

Therefore, in the power-off state, only the first LED LED1 is turned on as in the third degree, and all the second to fourth LEDs LED2-LED4 are turned off.

In addition, the on / off time of the second LED (LED2) can be adjusted by using the time-correcting elements C1 and R3 of the first multi-vibrator MB1, and the time-correcting element C2 of the second multi-vibrator MB2. , R9) may be used to adjust the on / off time of the third LED (LED3).

As described above, according to the power management state display circuit of the power-saving monitor according to the present invention, it is possible to determine whether the horizontal and vertical synchronization signals are input by using the transistor and the multivibrator, and to determine the power management state corresponding to the predetermined LEDs. By informing the outside, it is effective to make it easy to identify different power management states from the outside while being compatible with the common circuit in a simple circuit configuration without a microcomputer.

Claims (3)

Synchronization determination means for checking whether the horizontal synchronization signal and the vertical synchronization signal are input and determining a power management state corresponding thereto; A power management state display circuit of a monitor comprising light emitting elements turned on / off in accordance with the power management state determined by the synchronization determining means, The light emitting device is composed of four LEDs on a predetermined front surface of the monitor, so that the user can easily recognize the current power management state of the monitor by turning on / off the corresponding light emitting device according to the determination result of the synchronization determining means. Power management status display circuit in power-saving monitors. The method of claim 1, The synchronization determining unit determines whether the pulse waveform of the horizontal synchronization signal is turned on according to whether the first transistor Q1 and the first transistor Q1; A first multi-vibrator MB1 differently representing output signals of the output terminal Q and the inverted output terminal Q depending on whether the first transistor Q1 is turned on; Whether the first time constant circuit elements C1 and R3 connected to the other input terminal of the first multivibrator MB1 to control the output time of the first multivibrator MB1 and the pulse waveform of the vertical synchronization signal are inputted or not. A second transistor Q3 whose turn-on is determined by A second multivibrator MB2 which separately represents output signals of the output terminal Q and the inverted output terminal Q according to whether the second transistor Q3 is turned on; In the power saving type monitor, characterized in that the second time constant circuit device (C2, R9) is connected to the other input terminal of the second multi-vibrator (MB2) to control the output time (MB2) of the second multi-vibrator (MB2) Power Management Status Display Circuit. The method according to claim 1 or 2, The display means includes a first light emitting diode LED1 which is always turned on when main power is supplied; A third transistor Q2 that is turned on / off by an output of the first multi-vibrator according to whether a horizontal synchronization signal is input; A second light emitting diode LED2 whose lighting is determined according to whether the third transistor Q2 is turned on; A fourth transistor Q4 turned on / off by an output of the second multivibrator MB2 according to whether a vertical synchronization signal is inputted; A third light emitting diode LED3 whose lighting is determined according to whether the fourth transistor Q4 is turned on; A fifth transistor Q5 turned on / off by an inverting output of the first or second multivibrator, A power management state display circuit in a power saving type monitor comprising a fourth light emitting diode (LED4) which is turned on only when the fifth transistor (Q5) is turned off.