KR100195618B1 - Power managememt mode transforming method - Google Patents

Abstract

The present invention relates to an image display apparatus having a power management system for power saving. In particular, a control method performed according to a user's operation is embedded in a microcomputer in an image display apparatus, and an external key mounted on the computer image display apparatus is used. When pressed, the microcomputer switches the power management status of the computer video display device from the normal mode, the standby mode, the pause mode to the stop mode, and converts the image display device converted using the communication port mounted on the computer image display device. It is possible to control the power management state of the computer main body according to the mode, and also to automatically return to the normal mode according to the output signal of the computer main body in the stop mode.

Description

How to switch the power management mode of the computer video display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer image display apparatus, and in particular, various power management systems (DPMSs) are controlled by a microcomputer control in a computer image display apparatus according to a user's operation using an external key. The present invention relates to a method for switching a power management mode of a computer image display apparatus which manages power of a computer main body using a communication port in an image display apparatus.

The power management system (DPMS) is a function that can reduce power consumption by managing the power of a video display device, which is a computer peripheral device, according to the usage state of a computer system, and is proposed by the US Video Electronics Standard Association (VESA).

According to the proposal of VESA, the computer main body selectively outputs or blocks the horizontal synchronizing signal and the vertical synchronizing signal to the computer image display device according to the usage state of the computer system, and in the computer image display device, Power management corresponding to a state in which a synchronization signal is input is performed.

The power management is divided into a normal mode (On state), a standby mode (Stand-by state), a suspend mode (Suspend state) and a stop mode (Power-off state).

Here, in the normal mode, both pulse outputs of the horizontal synchronization signal and the vertical synchronization signal are input, and in the standby mode, only the vertical synchronization signal is input. In the pause mode, only the horizontal synchronization signal is input, and in the stop mode, neither the horizontal synchronization signal nor the vertical synchronization signal is input.

In this power management state, the computer system sequentially switches from the normal mode to the standby mode, the pause mode, and the stop mode in response to the elapsed time when the computer system is not in use. ], It is 65 [W] or less in the standby mode, 25 [W] or less in the pause mode, and 5 [W] or less in the stop mode. I have decided.

1 is a block diagram showing an example of the DPMS implementation of such a conventional video display device, its configuration and operation principle are as follows.

When AC input power is applied from the outside and the power switch of the computer image display device is turned on, and the power circuit unit 14 normally supplies power to each part of the circuit, the system starts operation, and the horizontal synchronous signal ( H-SYNC) and the vertical synchronization signal V-SYNC are applied to the microcomputer unit 10, and an image signal composed of red (R), green (G), and blue (B) colors is applied to the image circuit unit 11. do. The input image signals R, G, and B are amplified and synthesized by the image circuit unit 11 including the image signal input unit, the image signal driver, and the image signal output unit to be implemented as an image through the cathode ray tube image display device 12. . The horizontal synchronizing signal and the vertical synchronizing signal are applied to the deflection circuit and the high voltage circuit unit 13 including the synchronous signal processing unit, the horizontal / vertical oscillation circuit unit, the vertical output circuit unit, the horizontal deflection output circuit unit, etc. through the microcomputer unit 10, The deflection circuit and the high voltage circuit unit 13 supply a deflection current to the horizontal / vertical deflection coil for realizing the image by the cathode ray tube 12, and apply a high voltage to the anode of the cathode ray tube 12. The heater voltage supply unit 15 receives a control signal from the microcomputer unit 10 and a constant voltage from the power supply circuit unit 14 to provide a voltage for heater heating of the cathode ray tube 12. The microcomputer unit 10 performs a DPMS that manages power consumed by the computer image display apparatus according to a synchronization signal state from the computer main body. In the standby mode, the microcomputer unit 10 does not implement an image and is in a pause mode. In this case, the heater heating power of the cathode ray tube 12 is stopped except for the power supply, and the power consumption is minimized by supplying power only to the microcomputer unit 10 in the stop mode. The supply of power to the microcomputer section 10 continues as long as the main power supply of the apparatus is not turned off, and may or may not be restored depending on the state of the horizontal / vertical synchronization signal.

2 is a flowchart illustrating an example of a method of implementing DPMS by the microcomputer 10 of FIG. 1.

When the DPMS start program is executed by the microcomputer, the horizontal synchronizing signal and the vertical synchronizing signal input from the computer main body 16 are detected by the counter, and only the vertical synchronizing signal is input according to the presence or absence of the horizontal / vertical synchronizing signal after the detection. When the horizontal sync signal is input, it is in the pause mode. When both horizontal and vertical sync signals are not input, the mode is changed to the stop mode. Done. And when both sync signals are input, it maintains normal mode continuously.

The conventional method for implementing DPMS by a microcomputer of the above-described configuration and method has reduced power consumption than when power management is not performed by DPMS. However, power management of a computer image display device is not independent, As a subordinate operation, the user cannot arbitrarily set the computer image display device to a stop mode in a normal mode, a standby mode and a pause mode in order to reduce power consumption.

Accordingly, an object of the present invention is to switch to the stop mode according to the user's operation in the normal mode, the standby mode and the pause mode, and to control the power management state of the computer main body by using the communication port installed in the computer image display device. The present invention provides a method of switching a power management mode of a computer image display device.

It is another object of the present invention to provide a method for switching a power management mode of a computer image display device which can automatically return to a normal mode after a stop mode.

1 is a block diagram showing an example of a power management system of a conventional video display device;

2 is a flowchart illustrating an example of a method of implementing a power management system of FIG. 1;

3 is a block diagram showing an embodiment of a computer image display device to which the present invention is applied;

4 is a block diagram showing an embodiment of a power supply circuit of a computer image display device to which the present invention is applied;

5 is a detailed circuit diagram illustrating an embodiment of a main power control unit of FIG. 4;

6 is a detailed circuit diagram illustrating an embodiment of the heater voltage supply unit of FIG. 4;

7 is a flowchart illustrating an embodiment of performing a power management method to which the present invention is applied;

8 is a flowchart illustrating an embodiment of an automatic return routine for performing automatic return after a stop mode in the method for switching a power management mode to which the present invention is applied.

Explanation of symbols used in the main part of the drawing

S71: Sync signal detection and mode switching process

S72: Mode switching process according to user's operation

S73: Communication process to the computer body

S74: Automatic return routine

S81: Sync signal detection process

S82: Mode Return Process

A characteristic of the method for switching the power management mode of the computer image display device according to the present invention for achieving the above object is to wait the power management state of the computer image display device according to the user's operation using an external key, etc. It can convert from the mode or the pause mode to the stop mode, and can control the power management state of the computer main body by using the communication port installed in the computer image display device, and automatically return to the normal mode after the stop mode. Power management method.

Hereinafter, a preferred embodiment of a method for switching a power management mode of a computer image display device according to the present invention will be described in detail with reference to FIGS. 3 to 8.

3 is a block diagram showing an embodiment of a computer image display device to which the present invention is applied and its configuration and operation principle are as follows.

When AC input power is applied from the outside and the power switch of the image display device is turned on, and the power circuit unit 34 supplies power to each part of the circuit normally, the system starts operation and the horizontal synchronizing signal H- The SYNC and the vertical synchronizing signal V-SYNC are applied to the microcomputer unit 30, and the image signals R, G, and B are applied to the image circuit unit 31 of the image display device. The input image signal is amplified and synthesized by the image circuit unit 31 including the image signal input unit, the image signal driver, and the image signal output unit to be implemented as an image through the cathode ray tube image display device 32. The horizontal synchronizing signal and the vertical synchronizing signal are applied to the deflection circuit and the high voltage circuit unit 33 including the synchronizing signal processing unit, the horizontal / vertical oscillation circuit unit, the vertical output circuit unit and the horizontal deflection output circuit unit through the microcomputer unit 30, The deflection circuit and the high voltage circuit unit 33 flow a deflection current to the horizontal / vertical deflection coils for realizing the image by the cathode ray tube 32, and apply a high voltage to the anode of the cathode ray tube 32. The heater voltage supply unit 35 receives a control signal from the microcomputer unit 10 and a constant voltage from the power supply circuit unit 34 to provide a voltage for heating the heater of the cathode ray tube 32. The microcomputer unit 30 performs a DPMS for managing the power consumed by the computer image display apparatus according to the synchronization signal state from the computer main body. In the standby mode, the microcomputer unit 30 does not implement an image and is in the pause mode. In this case, other than the heater preheating power of the cathode ray tube 32, the operation is stopped, and in the stop mode, power is supplied only to the microcomputer unit 30 to minimize power consumption. The supply of power to the microcomputer unit 30 is continued as long as the main power supply of the apparatus is not turned off, and may or may not be restored depending on the state of the horizontal / vertical synchronization signal.

The above description of FIG. 3 is the same as that of FIG. 1, which is a block diagram showing an example of a DPMS implementation of a conventional image display apparatus, and a component for applying the present invention generates an input signal according to a user's operation. As a means for giving, in this example, a power saving mode setting key 38 is provided which shares its function with a push switch which is a main power switch of a computer image display device and is installed at a predetermined place outside the computer image display device. The external key input signal can be applied to the microcomputer 30, and the mode control signal can be sent from the microcomputer 30 to the power saving circuit section 37 in the computer main body 36 using the communication port.

4 is a block diagram showing an embodiment of a power circuit of a computer image display device to which the present invention is applied, and its configuration and operation are as follows.

When the AC input power is applied to the AC power input unit 40, shielding against external noise and internal noise carried on the input power is made and applied to the degaussing unit 41 and the rectifier circuit unit 42. All. The degaussing unit 41 neutralizes the magnetic field of the shadow mask of the cathode ray tube. The degaussing unit 41 performs a degaussing operation in response to a signal from the degaussing control unit of the microcomputer when a key is input by a user or when the power is turned on. The rectifier circuit 42 converts AC input power from the outside into direct current and outputs it to the auxiliary power supply 47 and the PFC unit 43. The power factor control (PFC) unit 43 boosts the DC voltage input from the rectifying circuit unit 42 to 400 [V], thereby maintaining a balance between power supply and power consumption, thereby reducing power consumption. And the output is supplied to the juice switching power supply 44. The juice switching power supply 44 generally generates one or more secondary powers using a switching transformer to supply the necessary power to each load through the circuit voltage supply 45. The main power control unit 46 controls the PFC unit 43 and the juice switching power supply unit 44 in the pause mode or the stop mode according to the main power control signal output from the microcomputer. The auxiliary power supply 47 receives power from the rectifier circuit 42 and continues to supply a small amount of power to the microcomputer power supply 48 and the heater voltage supply 49. The heater voltage supply unit 49 supplies a voltage for heating the heater of the cathode ray tube and off-controls the heater supply voltage according to a control signal output from the heater voltage controller of the microcomputer. At this time, the voltage supply to the microcomputer or the heater may be supplied from the juice switching power supply 45 instead of the auxiliary power supply 47 according to the circuit configuration.

FIG. 5 illustrates an embodiment of the main power supply control unit 46 of the power supply circuit of FIG. 4 in detail. The main power supply control signal of the microcomputer falling from the high potential to the low potential generated during the mode conversion to the pause mode and the stop mode state is shown. The transistor Q52 is driven by the power supply Vcc and a current flows through the photocoupler PT. The photocoupler drives another transistor Q51 by the voltage of the PFC unit 53 while separating the primary and secondary of the power supply. When the transistor Q51 is driven, the PFC unit 53 and the juice switching power supply unit 54 are off-controlled through two resistors R51 and R52.

FIG. 6 is a detailed view of one embodiment of the heater voltage supply unit 49 of the power circuit of FIG. 4, and the circuit unit may supply or cut off power to the heater of the cathode ray tube. The reason for controlling the heater voltage in this way is that when the new power is supplied to the cathode ray tube that is turned off, it takes time for the heater to be preheated. It is for preheating by continuously supplying power.

When the heater voltage is supplied from the auxiliary power supply 47 to the heater voltage supply unit 60 and a control signal output from the heater voltage control unit of the microcomputer is applied, the transistor Q61 is driven through the resistor R62, and the transistor ( The output signal of Q61 again controls another transistor Q62 to interrupt the flow of current to the heater 61 of the cathode ray tube 62. That is, when the high potential heater voltage control signal is supplied from the microcomputer in the stop mode, no current is supplied to the heater 61. When the low voltage heater voltage control signal is supplied from the microcomputer in the non-stop mode, the heater Current is supplied to 61 to preheat.

FIG. 7 is a flowchart illustrating an embodiment of a method for switching a power management mode to which the present invention is applied, and performs power management of a computer image display device, and includes a synchronization signal detection and mode switching process (S71) and a mode switching process according to a user's operation. (S72), a communication process to the computer main body (S73), and an automatic return routine (S74).

The operation of the power management mode switching method of the computer image display device having the above configuration is as follows.

In the synchronizing signal detection and mode switching process (S71), the horizontal and vertical synchronizing signals input from the computer main body are detected. When only the vertical synchronizing signal is input according to the detection result, the computer image display device enters the temporary pause mode and the horizontal synchronizing signal is detected. When only the input mode is input, the state is changed to the pause mode. If neither the horizontal or vertical synchronization signal is input, the mode is changed to the stop mode.

In the mode switching unit S72 according to the user's operation, the mode switching unit S72 switches to the stop mode according to the user's operation by the external key in the normal mode, the standby mode or the pause mode switched in the synchronization signal detection and mode switching process S71. Will be.

The communication process (S73) to the computer main body transmits the state of the computer image display device switched from the normal mode, the standby mode or the pause mode to the normal mode to the computer body in the mode switching process (S72) according to the user's operation. Let it be.

The automatic return routine (S74) automatically returns the power management state of the computer image display device including the stop mode to the normal mode according to the presence or absence of a synchronization signal from the computer main body by performing the automatic return routine shown in FIG. .

8 is a flowchart showing an embodiment of an automatic return routine for performing an automatic return after a stop mode in the method of switching a power management mode of a computer image display device to which the present invention is applied, and a synchronization signal detection process (S81) and a mode return process. (S82) and the mode return only when both the horizontal and vertical synchronization signals are inputted by sequentially detecting the horizontal synchronization signal and the vertical synchronization signal input from the computer main body in the synchronization signal detection process (S81) by the start of the automatic return routine. Enter the process (S82). In the mode return process (S81), only when both horizontal and vertical sync signals are detected according to the result of the sync signal detection process (S81), the mode returns to the normal mode. At this time, if one or more of the horizontal synchronizing signal and the vertical synchronizing signal are not detected, the previous mode is maintained without changing to the normal mode.

According to the power management mode switching method of the computer image display device according to the present invention as described above, according to the user's operation by an external key or the like

By switching the computer video display device from the normal mode, the standby mode and the pause mode to the stop mode, the power consumption can be reduced, and the power of the computer video display device can be managed independently. It can control the power management state of the computer main body by using the communication port, and it can reduce the inconvenience of the user by automatically returning to the normal mode after the stop mode.

Claims (2)

A synchronization signal detection and mode switching process for switching the power management mode to the normal mode, the standby mode, the pause mode or the stop mode according to the detection result of the horizontal and vertical synchronization signals input from the computer main body; A mode switching process according to the user's operation of switching to the stop mode according to the user's operation in the normal mode, the standby mode or the pause mode among the states switched in the synchronization signal detection and mode switching process; A communication process to the computer main body which transmits the change to the stop mode to the computer main body when it is switched to the stop mode in the mode switching process according to the user's operation; Power management of the computer image display device, characterized in that controlled by an automatic return routine to return to the normal mode when the horizontal and vertical synchronization signals from the computer main body are input in the pause, pause and stop modes. How to switch modes. The method of claim 1, wherein the automatic return routine, A synchronization signal detection process of sequentially detecting a horizontal synchronization signal and a vertical synchronization signal input from the computer main body by the start of the automatic return routine after the stop mode; And a mode return process for returning to the normal mode only when both horizontal and vertical synchronization signals are detected according to the detection result of the synchronization signal detection process.