KR19980036412A

KR19980036412A - DPMS drive device using external sensor

Info

Publication number: KR19980036412A
Application number: KR1019960054977A
Authority: KR
Inventors: 손영기
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1996-11-18
Filing date: 1996-11-18
Publication date: 1998-08-05

Abstract

The present invention relates to a DPMS driving apparatus, and more particularly, to a DPMS driving apparatus using an external sensor capable of preventing a user from being left in a blanking state and wasting electric power by recognizing the execution state of a power saving mode (DPMS) .

An optical sensor that is switched in accordance with the brightness of the room in a display device having a DPMS mode implementing function for switching the power supply state of the display device to the power saving mode,

A microcomputer for outputting a signal for controlling the DPMS driving of the display device according to the switching result of the optical sensor, and a switching circuit for switching the power source applied to the display device according to the control signal of the microcomputer, The main power is cut off by the light sensing of the optical sensor 100 to prevent unnecessary power consumption even if the user does not perform the power-off by mistakenly assuming that the screen of the display device is in the black state .

Description

DPMS drive device using external sensor

In general, a computer peripheral device refers to various input and output devices such as a monitor, a printer, and a plotter connected to a computer system. Typically, such computer peripheral devices are supplied with power by supplying power to the computers, and power may be supplied by separate power on / off switches. Since each peripheral device is required to perform initializing operation and preheating operation when power is applied, it is not possible to use these devices at the same time as the voltage is applied, and these peripheral devices are not used by the user for a while Even if it does not interrupt the power supply, the power supply has been maintained continuously.

In particular, a monitor widely used as a display device of a computer is a device that receives an input signal from a computer and converts it into a video signal so that a user can visually check the operation of the computer. Is also determined.

In other words, when combined with a computer, it operates by receiving a signal from a computer using a cable for signal transmission. When there is no signal from the computer, the basic operation is lost, but the purpose of the device is lost.

A commonly used method for controlling this is to blank the data image that was being displayed on the monitor if the computer user did not use the computer to exceed the set time. If the user presses the key again while the screen blanking function is being performed, the blanking function of the computer monitor is released to display the previously displayed data image again.

In this method, only the data image being displayed on the monitor is blanked, so that the monitor is still supplied with the power even during the blanking period, so that the power consumption is almost the same as that during normal operation.

As a solution to this problem, VESA (Video Electronics Standards Association) proposes a DPMS (Display Power Management System) that can save power by managing the power of a monitor which is a peripheral device of a computer in response to the use state of a computer system.

According to the DPMS mode, the vertical synchronizing signal of the horizontal synchronizing signal is selectively supplied to or disconnected from the monitor in order to realize different power management states corresponding to the use state of the computer system. In the monitor, the horizontal synchronizing signal and the vertical synchronizing signal The power management state corresponding to the input state is performed.

At this time, the power management state is classified into On, Stand-by, Suspend, and Off states. The horizontal synchronization signal and the vertical synchronization signal The supply status of the signal is shown in Table 1 below.

Power Management Status Synchronous signal Horizontal Perpendicular ON state U U STAND-BY state radish U Suspended (SUSPEND) state U radish OFF state radish radish

In other words, only the pulse output of the vertical synchronizing signal is present in the standby state and only the pulse output of the horizontal synchronizing signal is present in the on state, and only the pulse output of the vertical synchronizing signal is present in the on state. The pulse outputs of the vertical synchronizing signal and the horizontal synchronizing signal do not appear.

Therefore, the power management state can be distinguished according to the pulse output states of the horizontal synchronous signal and the vertical synchronous signal, and these power management states can be switched from the on state to the on state in accordance with the continuous passage of time during which the computer system is not used The apparatus is switched from the standby state to the suspended state to the off state.

In the table (1), the absence and the absence states of each signal means the presence or absence of a normal synchronizing signal frequency of each signal, And the vertical synchronizing signal is 40 Hz or more.

At this time, the duty ratio of the vertical and horizontal pulses should be less than 25%.

In the monitor connected to the computer and displaying various information, when the user does not use the computer, the power consumption mode is operated by the power saving mode by DPMS.

At this time, when the display mode is changed from the normal display state to the power saving (DPMS) mode, the monitor state is displayed as a black state. Accordingly, the user recognizes power off (power is completely turned off) There is a problem in that the display device being turned on may be left on for a long time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a DPMS driving apparatus using an external sensor capable of realizing DPMS drive control of a microcomputer in accordance with recognition of a light amount of an optical sensor provided outside a display device.

According to an aspect of the present invention, there is provided a display device having a DPMS mode implementing function for switching a power supply state of a display device to a power saving mode when a computer user leaves a seat or does not use a computer for a long time,

A microcomputer for outputting a signal for controlling the DPMS driving of the display device according to the switching result of the optical sensor; and a controller for switching the power applied to the display device according to a control signal of the microcomputer, And a switching circuit which is connected to the input / output terminal.

The microcomputer may further include a counter for counting a time of receiving the switching result of the optical sensor and providing a timing to switch to a standby state, a pause state, and an off state with the lapse of time, It is in point.

1 is a block diagram of a DPMS driving apparatus using an external sensor according to an embodiment of the present invention.

Fig.

The structure and operation of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a configuration diagram of a DPMS display device showing an embodiment of the present invention.

A microcomputer 200 for generating a DPMS mode implementation signal according to the switching result of the optical sensor 100 and a DPMS control module 200 for generating a DPMS mode implementation signal according to the switching result of the optical sensor 100, A switching device 300 for determining whether the power source driving circuit 10 and the constant voltage circuit 20 are turned on or off according to a signal received from the microcomputer 200, And a counter 400 for counting time and providing timing to switch to a standby state, a pause state, and an off state with the passage of time.

The present invention configured as above operates as follows.

The light sensor 100 is turned on according to the amount of ambient light. When the light sensor 100 receives light of a predetermined light amount or more, the light sensor 100 is maintained in a turn-off state.

The switching signal is transmitted to the microcomputer 200 so that the user can finish the computer operation and can be regarded as having turned off the interior lamp.

The power off control signal of the microcomputer 200 is controlled by the counter 400. The control signal is transmitted to the microcomputer 200 from the optical sensor 100 when the switching signal is transmitted to the microcomputer 200, And counts the elapsed time when the horizontal and vertical synchronizing signals are interrupted.

At this time, the microcomputer 200 confirms whether the DPMS mode is being realized according to the horizontal and vertical synchronization signals transmitted from the computer.

If there is no synchronizing signal transmitted from the computer and the display device is operating in the DPMS mode, the microcomputer 200 outputs a power-off control signal for power-off, and this signal is transmitted to the base end of the switching transistors Q2 and Q3 do.

When the switching transistors Q2 and Q3 are turned on, the input power of the display device is switched to be applied to the power source driving circuit 10 and the constant voltage circuit 20, thereby shutting off the power supply from the input power source.

Accordingly, even if the display of the display device is black due to the implementation of the DPMS mode and the user does not perform the power-off by mistaking the power-off state, the main power is cut off by the light sensing of the optical sensor 100, It is possible to prevent an unnecessary power waste.

Claims

A display device having a DPMS mode implementing function for switching a power supply state of a display device to a power saving mode when a computer user leaves the room or does not use the computer for a long time, the display device comprising:

An optical sensor switched according to the intensity of the room,

A microcomputer for outputting a signal for controlling the DPMS driving of the display device according to the switching result of the optical sensor;

And a switching circuit for switching a power source applied to the display device according to a control signal of the microcomputer.

The method according to claim 1,

And a counter for counting the time of receiving the switching result of the optical sensor and counting the DPMS driving elapsed time and providing a power shutoff signal to the microcomputer when the DPMS driving elapsed time exceeds a predetermined time. Improved DPMS drive with sensor.