KR200215118Y1 - Liquid crystal display monitor and computer system having the same - Google Patents

Abstract

In the disclosed LCD monitor (Liquid Crystal Display Monitor) is back light (Back Light) on / off control by the host. When the display mode is changed, the host temporarily turns off the backlight of the LCD monitor so that noise generated by the mode change is not displayed on the screen of the LCD monitor. In addition, when the system is powered on, the backlight of the LCD monitor is turned off even during a period in which the display information is not provided to the LCD monitor so that noise that may be generated at the initial stage of driving is not displayed on the screen of the LCD monitor. In addition, the LCD monitor has a built-in backlight initialization circuit, and the backlight is turned off at the initial stage when the LCD monitor is powered on. If the LCD monitor is not connected to the host, the backlight is not turned on.

Description

LCD monitor and computer system with same {LIQUID CRYSTAL DISPLAY MONITOR AND COMPUTER SYSTEM HAVING THE SAME}

The present invention relates to a display monitor and a computer system, and more particularly, to a liquid crystal display monitor (LCD) for displaying images by inputting digital display information from a host and a computer system having the same. It is about.

Until recently, CRT monitors were mainly used as display devices of computer systems. However, as LCD panel technology has advanced, LCD monitors have been provided for desktop computers as well as portable computers. Early products of LCD monitors were equipped with analog / digital conversion circuitry to input and display analog video signals from the host. Recently, LCD monitors for inputting and displaying digital video signals from a host and video cards for providing digital video signals have been provided.

1 is a block diagram showing a circuit configuration of a video card to which a general CRT monitor and an LCD monitor can be connected. Referring to FIG. 1, the video card 10 mounted in the host 5 may include a video controller 11, a RAMDAC 12, a digital transmitter 14, and a CRT monitor 20 for connection. It comprises a PIN connector 13 and a 26 PIN MDR connector 15 for connecting the LCD monitor 30.

As is well known, the video controller 11 is connected to the system bus 7 and reads image data from the video memory 16 and outputs it to the RAMDAC 12 and the digital transmitter 14. The RAMDAC 12 converts the digital video signal output from the video controller 11 into an analog video signal and outputs the analog video signal to the CRT monitor 20 through the CRT monitor connecting cable 21 connected to the 15 PIN connector 13. . The digital transmitter 14 converts a parallel digital video signal provided from the video controller 11 in series for each of R (Red), G (Green), and B (Blue). The digital display information including the converted signal, the control signal, and the clock signal is transmitted to the LCD monitor 30 through the LCD monitor cable 31 connected to the 26 PIN MDR connector 15. The digital transmitter 14 includes a PanelLink Transmitter Family of Silicon Image, Inc. 2 is a view showing the pin configuration of the 26PIN MDR connector 15 for connecting the LCD monitor 30.

3 is a block diagram showing a circuit configuration of a general LCD monitor. Referring to FIG. 3, the LCD monitor 30 has a 26 PIN MDR connector 32, a digital receiver 33, and a back light 35 for connecting the connecting cable 31. LCD panel 34, DC / AC inverter 36 and AC adapter 37. The digital receiver 33 restores the digital display information transmitted from the digital transmitter 14 to the original signal and provides it to the LCD panel 34. The digital receiver 33 includes a PanelLink Receiver Family of Silicon Image, Inc. The DC / AC inverter converts the DC voltage input from the AC adapter 37 into a high voltage AC voltage for operating the backlight 35 and provides the same to the backlight 35.

In the conventional LCD monitor as described above, noise is displayed on the LCD monitor when the display mode is changed or when the computer system is powered on. However, if you can turn off the backlight of the LCD monitor for a certain period of time when the display mode is changed or when the computer system is powered on (because the displayed screen is not shown to the user when the backlight is turned off), noise may appear on the LCD screen. You can prevent it from being displayed.

Accordingly, an object of the present invention is to provide an LCD monitor and a computer system suitable for turning off the backlight of the LCD monitor in a host as proposed to solve the above-mentioned problems.

1 is a block diagram showing a circuit configuration of a video card capable of connecting a general CRT monitor and an LCD monitor;

2 shows a pin configuration of a 26PIN MDR connector for connecting an LCD monitor;

3 is a block diagram showing the circuit configuration of a typical LCD monitor;

4 is a block diagram showing a circuit configuration of a video card according to a preferred embodiment of the present invention;

5 is a view showing the pin configuration of the 26PIN MDR connector according to an embodiment of the present invention;

6 is a block diagram illustrating a circuit configuration of an LCD monitor having a configuration of receiving a backlight on / off control signal from a host as an embodiment of the present invention;

7 is a block diagram showing a circuit configuration of an LCD monitor including a backlight initialization circuit as another embodiment of the present invention;

8 is a circuit diagram showing a detailed configuration of a backlight initialization circuit; And

FIG. 9 is a circuit diagram equivalently showing a state in which the switches are connected such that the backlight initialization circuit shown in FIG. 8 is suitable for the polarity of the backlight control signal and the operating characteristics of the DC / AC inverter.

* Description of the symbols for the main parts of the drawings *

10: video card 13: 15PIN connector

14: digital transmitter 15: 26PIN MDR connector

20: CRT monitor 30: LCD monitor

33: digital receiver

According to an aspect of the present invention for achieving the object of the present invention as described above, the LCD monitor for receiving the digital display information from the host to display the image: connected between the host and the LCD monitor and the digital display information and from the host; A connection cable for inputting a backlight control signal for backlight on / off control to the LCD monitor; A connector coupled with the connection cable; A digital receiver for receiving display information through the connection cable; An LCD panel having a backlight and inputting the received digital display information to display an image; A backlight initialization circuit for inputting the backlight control signal to convert the DC / AC inverter to suit the polarity and turning off the DC / AC inverter at an initial stage when power is supplied to the LCD monitor; And a DC / AC inverter for supplying power to the backlight.

In this embodiment, the backlight initialization circuit may include: a first inverter for inputting and inverting the backlight control signal; A second inverter inverting the output of the first inverter; A first resistor having one end connected to an output terminal of the second inverter and the other end connected to an on / off control terminal of the DC / AC inverter; One end is connected to an on / off control terminal of the DC / AC inverter, and the other end is connected to a power supply voltage to include a second resistor for turning off the DC / AC inverter at an initial stage when the LCD monitor is powered on.

The backlight initialization circuit may include: an inverter configured to input and invert the backlight control signal; A first resistor having one end connected to an output terminal of the inverter and the other end connected to an on / off control terminal of the DC / AC inverter; One end is connected to an on / off control terminal of the DC / AC inverter, and the other end is connected to a power supply voltage to include a second resistor for turning off the DC / AC inverter at an initial stage when the LCD monitor is powered on.

According to another aspect of the invention, in a computer system having an LCD monitor:

The LCD monitor comprises: a) a connection cable connected between a system main body and an LCD monitor to input digital display information and a backlight control signal for backlight on / off control from the system main body to the LCD monitor; b) a first connector coupled with the connection cable; c) a digital receiver for receiving display information via the connection cable; d) an LCD panel having a backlight and inputting the received digital display information to display an image; e) a backlight initialization circuit for inputting the backlight control signal to convert the DC / AC inverter to suit the polarity and turning off the DC / AC inverter at an initial stage when power is supplied to the LCD monitor; f) a DC / AC inverter for powering the backlight;

The system body of the computer system includes: g) a second connector coupled with the connection cable; h) control signal generating means for generating said backlight control signal; i) a transmission buffer connected between said control signal generating means and said second connector, for transmitting a backlight control signal generated by said control signal generating means to said LCD monitor via said connection cable.

In this embodiment, the control signal generating means outputs a control signal for turning off the backlight at the start of display mode conversion when the display mode is switched, and controls to turn on the backlight when conversion of the display mode is completed. Output the signal.

In this embodiment, the control signal generating means is a video controller.

According to the above proposal, the back light on / off control is performed by the host (system main body), and when the display mode is changed, the backlight of the LCD monitor is temporarily turned off to be generated according to the mode change. Possible noises are not displayed on the screen of the LCD monitor. In addition, when the system is powered on, the backlight of the LCD monitor is turned off even during a period in which the display information is not provided to the LCD monitor, so that noise that may be generated at the initial stage of operation may not be displayed on the screen of the LCD monitor.

(Example)

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

The novel LCD monitor of the present invention has a back light on / off control by a host. When the display mode is changed, the host temporarily turns off the backlight of the LCD monitor so that noise generated by the mode change is not displayed on the screen of the LCD monitor. In addition, when the system is powered on, the backlight of the LCD monitor is turned off even during a period of time when the display information is not provided to the LCD monitor, so that noise that may be generated at the initial stage of operation is not displayed on the screen of the LCD monitor. In addition, the LCD monitor has a built-in backlight initialization circuit so that the backlight is turned off when the LCD monitor is powered on. The backlight is not turned on even when the LCD monitor is powered on when not connected to the host.

4 is a block diagram showing a circuit configuration of a video card according to a preferred embodiment of the present invention. In FIG. 4, circuit blocks that perform the same functions as the circuit blocks shown in FIG. 1 are denoted by the same reference numerals.

Referring to FIG. 4, the video card 40 mounted on the host 5 is connected to the video controller 41, the RAMDAC 12, the digital transmitter 14, and the CRT monitor 20. It comprises a PIN connector 13, a 26 PIN MDR connector 43 for connection of the LCD monitor 50 and a transmission buffer 42 for transmitting the backlight control signal BLON #.

As is well known, the video controller 41 is connected to the system bus 7 and reads image data from the video memory 16 and outputs it to the RAMDAC 12 and the digital transmitter 14. The RAMDAC 12 converts the digital video signal output from the video controller 41 into an analog video signal and outputs the analog video signal to the CRT monitor 20 through the CRT monitor cable 21 connected to the 15 PIN connector 13. The digital transmitter 14 converts a parallel digital video signal provided from the video controller 41 in series for each of R (Red), G (Green), and B (Blue), and includes a control signal and a clock signal. The digital display information is transmitted to the LCD monitor 50 via the LCD monitor cable 51 connected to the 26 PIN MDR connector 43. The digital transmitter 14 includes a PanelLink Transmitter Family of Silicon Image, Inc. The backlight control signal BLON # output from the video controller 41 is input to the transmission buffer 42 to the LCD monitor 50 through the LCD monitor cable 51 connected to the 26 PIN MDR connector 43. Is sent.

5 is a view showing the pin configuration of the 26PIN MDR connector according to a preferred embodiment of the present invention. As shown in FIG. 5, pin 26 is allocated to the backlight control signal BLON #.

6 is a block diagram illustrating a circuit configuration of an LCD monitor having a configuration of receiving a backlight on / off control signal from a host as an embodiment of the present invention, and FIG. 7 is a backlight initialization circuit as another embodiment of the present invention. Each of the block diagrams showing the circuit configuration of the LCD monitor provided with is shown. In Figs. 6 and 7, circuit blocks which perform the same functions as those shown in Fig. 2 are denoted by the same reference numerals.

Referring to FIG. 6, the LCD monitor 50 has a 26 PIN MDR connector 52, a digital receiver 33, and a back light 35 for connecting the connecting cable 51. LCD panel 34, DC / AC inverter 36 and AC adapter 37. The digital receiver 33 restores the digital display information transmitted from the digital transmitter 14 to the original signal and provides it to the LCD panel 34. The digital receiver 33 includes a PanelLink Receiver Family of Silicon Image, Inc. The DC / AC inverter 36 converts the DC voltage input from the AC adapter 37 into a high voltage AC voltage for operating the backlight 35 and provides the same to the backlight 35. In particular, the backlight control signal BLON # provided from the host 5 is provided to the DC / AC inverter 36 and is turned on by the backlight control signal BLON #. On / off is controlled.

The video controller 41 outputs a backlight control signal BLON # for turning off the backlight at the start of display mode conversion when the display mode is switched, and turns on the backlight when the display mode is changed. Outputs the write control signal BLON #.

The LCD monitor 50a shown in FIG. 7 has a configuration in which the backlight initialization circuit 53 is further included in the above-described configuration of the LCD monitor 50. Referring to FIG. 7, the backlight initialization circuit 53 inputs the backlight control signal BLON # to convert the backlight control signal according to the polarity of the DC / AC inverter 36 and supplies power to the LCD monitor 50a. The DC / AC inverter 36 is turned off during this initial schedule.

8 is a circuit diagram showing the detailed configuration of the backlight initialization circuit. As shown in FIG. 8, the backlight initialization circuit 53 includes first and second inverters IV10 and IV12, first to fourth resistors R10, R11, R12, and R13, and first to fourth switches. (S1, S2, S3, S4). The first and second switches S1 and S2 are adapted to suit the polarity of the backlight control signal BLON #, and the third and fourth switches S3 and S4 are connected to the DC / AC inverter 36. It is for making it suitable for operation characteristics.

FIG. 9 is a circuit diagram equivalently showing a state in which the switches are connected such that the backlight initialization circuit shown in FIG. 8 is suitable for the polarity of the backlight control signal and the operating characteristics of the DC / AC inverter. In the case illustrated in FIG. 9A, the backlight control signal BLON # has a low active characteristic and the DC / AC inverter 36 is turned on when the backlight control signal having a low voltage level is input. The circuit configuration for the case having is shown. 9B, the backlight control signal BLON has a high active characteristic and the DC / AC inverter 36 is turned on when the backlight control signal having a high voltage level is input. The circuit configuration for the case having is shown. The third resistor R12 and the fourth resistor R13 are pull up and pull down resistors, respectively.

In the above, the configuration and operation of the circuit according to the present invention is shown in accordance with the above description and drawings, but this is merely an example, and various changes and modifications are possible without departing from the technical spirit of the present invention. .

According to the present invention as described above, in a computer system having an LCD monitor, it is possible to prevent noise from being displayed on the screen of the LCD monitor at the initial change of the display mode or when the system is powered on.

Claims (6)

LCD monitors that display images by receiving digital display information from a host: A connection cable connected between a host and an LCD monitor to input digital display information and a backlight control signal for backlight on / off control from the host to the LCD monitor; A connector coupled with the connection cable; A digital receiver for receiving display information through the connection cable; An LCD panel having a backlight and inputting the received digital display information to display an image; A backlight initialization circuit for inputting the backlight control signal to convert the DC / AC inverter to suit the polarity and turning off the DC / AC inverter at an initial stage when power is supplied to the LCD monitor; And a DC / AC inverter for supplying power to the backlight. The method of claim 1, The backlight initialization circuit is: A first inverter configured to input and invert the backlight control signal; A second inverter inverting the output of the first inverter; A first resistor having one end connected to an output terminal of the second inverter and the other end connected to an on / off control terminal of the DC / AC inverter; One end is connected to the on / off control terminal of the DC / AC inverter, and the other end is connected to a power supply voltage, characterized in that it comprises a second resistor for turning off the DC / AC inverter in the initial stage when the LCD monitor is powered on; LCD monitor. The method of claim 1, The backlight initialization circuit is: An inverter for inputting and inverting the backlight control signal; A first resistor having one end connected to an output terminal of the inverter and the other end connected to an on / off control terminal of the DC / AC inverter; One end is connected to the on / off control terminal of the DC / AC inverter, and the other end is connected to a power supply voltage, characterized in that it comprises a second resistor for turning off the DC / AC inverter in the initial stage when the LCD monitor is powered on; LCD monitor. In a computer system with an LCD monitor: The LCD monitor is: a connection cable connected between a system main body and an LCD monitor to input digital display information and a backlight control signal for backlight on / off control from the system main body to the LCD monitor; b) a first connector coupled with the connection cable; c) a digital receiver for receiving display information via the connection cable; d) an LCD panel having a backlight and inputting the received digital display information to display an image; e) a backlight initialization circuit for inputting the backlight control signal to convert the DC / AC inverter to suit the polarity and turning off the DC / AC inverter at an initial stage when power is supplied to the LCD monitor; f) a DC / AC inverter for powering the backlight; The system body of the computer system is: g) a second connector coupled with the connection cable; h) control signal generating means for generating said backlight control signal; i) a transmission buffer connected between said control signal generating means and said second connector, said transmission buffer for transmitting a backlight control signal generated by said control signal generating means to said LCD monitor via said connecting cable; system. The method of claim 4, wherein The control signal generating means And a control signal for turning off the backlight at the start of display mode conversion when the display mode is switched, and outputting a control signal for turning on the backlight when conversion of the display mode is completed. The method of claim 5, And said control signal generating means is a video controller.