KR100910910B1 - Display Data Processor Of Monitor - Google Patents

Abstract

The present invention relates to a display data processing apparatus of a monitor.

The display data processing apparatus for a monitor according to the present invention receives a digital or analog video signal from a PC, and outputs a digital / analog video input / output unit for outputting the display related information to the PC, and for storing the analog display related information. A second memory unit for storing a first memory unit and digital display related information, a switching unit for connecting any one of the first and second memory units to the digital / analog video input / output unit, and the digital / In order to determine the format of the video signal inputted through the analog video input / output unit, a synchronization signal detection unit for detecting and recognizing a horizontal synchronization signal (H-sync) and an output of the synchronization signal detection unit are input to check whether the horizontal synchronization signal is input. Display-related information according to the video format is output to the PC It is configured to include a switching control unit for controlling the switching unit.

Monitor, DDC, DVI-I, EDID, Video Signal Format

Description

Display Data Processor of Monitor

1 is a block diagram of a display data processing apparatus of a monitor according to the prior art;

2 is a block diagram of a display data processing apparatus of a monitor according to the present invention;

3 is a signal waveform diagram of each circuit part in a display data processing apparatus of a monitor according to the present invention;

<Explanation of symbols for the main parts of the drawings>

100: PC 200: Monitor

210: DVI-I port 220: first memory portion

230: second memory unit 240: switching unit

250: Sync signal detector 260: Switching controller

TECHNICAL FIELD The present invention relates to a monitor, and more particularly, to a display data processing apparatus of a monitor.

Recently, with the rapid spread of image display apparatuses with LCD panels, the interface between a monitor and a PC (personal computer) is increasingly used as a digital signal interface rather than an analog R / G / B signal interface.

Most LCD monitors currently on the market use a digital interface method, that is, a digital interface standard defined by the Digital Display Working Group (DDWG), and a digital visual interface (DVI) method using transition minimized differential signaling (TMDS) technology.

Here, the DVI interface method proposed by the DDWG includes the DVI-D method and the DVI-I method. The DVI-D method does not support analog input but only supports a digital interface, whereas the DVI-I method does not exist in addition to the digital interface. The format supports analog R / G / B / H / V signals for compatibility with analog interface.

For this reason, LCD monitors are generally equipped with ports using D-Sub and DVI-I schemes.

In this case, when the PC having a digital graphics card is connected to the DVI-I port, the monitor transmits digital EDID (Extended Display Identification Data), which is digital display related information, to the PC through the DVI-I port. When a PC having an analog graphics card is connected to the D-Sub port, the analog EDID is transmitted to the PC through the D-Sub port.

In addition, since the basic display characteristics of the monitor are defined in the EDID, the PC monitors the characteristics of the monitor to output an image signal for more efficient display.                         

Hereinafter, a display data processing apparatus of a monitor according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram showing a configuration of a display data processing apparatus of a monitor according to the prior art.

The display data processing apparatus of the monitor 20 according to the related art receives a digital / analog video signal from a PC 10 and outputs one of the corresponding display related information to the PC 10. And an output unit 21, a memory unit 22 for storing the display related information, and a microcomputer 23 for controlling the transmission of the display related information to the PC 10.

Here, the display-related information is defined by the EDID basic display characteristics of the monitor, the digital / analog video input / output unit 21 is a DVI-I port.

The display data processing apparatus of the monitor according to the related art, which is configured as described above, as shown in FIG. 1, when the graphic card of the PC 10 is digital, the monitor 20 and the PC are connected through the DVI-I port 21. (10) to the DDC (Display Data Channel) lines (SCL, SDA). Subsequently, the monitor 20 transmits the digital EDID stored in the memory unit 22 to the PC 10 under the control of the microcomputer 23. The PC 10 detects the display characteristics of the monitor 20 according to the EDID and outputs an image signal through the DVI-I port 21 accordingly. The monitor 20 then displays the video signal on the screen through a series of video processing.

On the other hand, even when the graphics card of the PC 10 is an analog system, the digital EDID is stored in the memory unit 22 and the monitor reads the digital EDID. Therefore, in the configuration of the DVI-I connector, an analog or digital signal can be input, but only one DDC communication line is used, so that an error in recognizing EDID data may occur.

On the other hand, the user can select the desired port from the analog or digital input through the setting menu (OSD) of the monitor 20 itself, in this case, the microcomputer 23 inputs the EDID data of the memory unit 22 This is a method of changing the video signal format. This method has a problem in that when the user first purchases and boots the monitor, the factory sets one of the two settings so that the user cannot recognize the setting state in advance.

As described above, the display data processing apparatus of the monitor according to the related art supports the digital signal input and the analog signal input by applying the DVI-I interface method, but the DDC line for transmitting the EDID to the PC is composed of only one channel. Since there is also one memory for storing EDID, only one of digital EDID or analog EDID is designated and stored.

In other words, if the analog EDID is specified, booting is not performed when the digital signal is input, and if the digital EDID is specified, the booting is not performed when the analog signal is input, there is a problem in that an accurate data interface is not achieved between the PC and the monitor.

Therefore, according to the conventional monitor display data processing apparatus, since the DVI-I input can input analog and digital video signal formats, only one pair of DDC communication lines (SCL and SDA) are used to process EDID data. There is a problem. In particular, most monitors adopting DVI-I require the input to be selected as analog or digital on the OSD. In this case, the user convenience is inferior. Otherwise, only the digital EDID is stored and the digital EDID is read when analog is input. In this case, a compatibility problem occurs in which a normal signal is not output depending on the video card.

In order to solve the above problems, the present invention includes a memory for analog and digital EDID, and detects the format (analog / digital) of an input video signal by using a horizontal synchronization signal. It is an object of the present invention to provide a display data processing apparatus of a monitor so that a complete interface between a monitor and a PC can be achieved regardless of a digital / analog signal.

Display data processing apparatus for a monitor according to the present invention for achieving the above object, the video input / output means for receiving a digital or analog video signal from a PC and outputting the display related information to the PC, analog display related First memory means for storing information and second memory means for storing digital display related information, switching means for connecting any one of said first and second memory means to said video input / output means; Sync signal detecting means for detecting and recognizing a horizontal sync signal (H-sync) for determining a video signal format input through the video input / output means, and whether the horizontal sync signal is input by receiving the output of the sync signal detecting means. Display related information according to the video format is output to the PC. It is configured to include a switching control means for controlling the locking of the switching means.

Hereinafter, a display data processing apparatus of a monitor according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing an embodiment of a configuration of a display data processing apparatus of a monitor according to the present invention.

The display data processing apparatus of the monitor 200 according to the present invention includes a digital / analog video input / output unit for receiving a digital or analog video signal from a PC 100 and outputting corresponding display related information to the PC 100. 210, any one of the first and second memory units 220 and 230 for storing the analog display related information and the digital display related information, and the first and second memory units 220 and 230, respectively. A switching unit 240 for connecting the digital / analog video input / output unit 210 and a horizontal synchronization signal (H−) to determine an image signal format inputted through the digital / analog video input / output unit 210. a sync signal detector 250 for detecting and recognizing sync, and an output signal of the sync signal detector 250 to check whether a horizontal sync signal is input, and to display a display tube according to a corresponding video format. And a switching controller 260 for controlling the switching unit 240 to output related information to the PC.                     

 Here, the digital / analog video input / output unit 210 is a DVI-I port, and the display-related information is an EDID defining basic display characteristics of the monitor, and the DVI-I port 210 is connected from the PC 100. The analog EDID of the analog signal input through the first memory unit 220 is stored in the first memory unit 220, and the digital EDID of the digital signal is stored in the second memory unit 230.

On the other hand, the synchronization signal detector 250 is an inverter 251 for inverting the horizontal synchronization signal (H-sync), and the integration circuit (R1, C1) for integrating the horizontal synchronization signal inverted by the inverter 251 And an exclusive OR (XOR) gate 252 configured to perform an exclusive OR operation on the inverted horizontal sync signal and the integrated signal as input. In this case, since the inverter 251 performs a kind of buffer function, the embodiment may not be used.

In addition, the switching controller 260 integrates the integrated circuits R2 and C2 for integrating the synchronization signal detected by the horizontal synchronization signal detector 250 and the integrated signal as an input signal for driving the switching unit 240. It is configured to include an inverter 261 for outputting.

FIG. 3 is a diagram showing signal waveforms in respective circuits of the monitor display data processing apparatus, and A is a signal waveform of an input terminal of the inverter 251 when a horizontal sync signal (H-sync) is input as a negative waveform. B is a voltage waveform across the capacitor C1 at the time of the A waveform input, A 'is a signal waveform at the input terminal of the inverter 251 when the H-sync is input as a positive waveform, and B is a 'A' is the voltage waveform across the capacitor C1 at the time of waveform input, C is the output waveform of the XOR gate 252, D is the input waveform of the inverter 261, and E is the output waveform of the inverter 261. The unit 240 is driven.

The operation of the display data processing apparatus of the monitor configured as described above is as follows.

When the digital / analog video signal is input from the PC 100 through the DVI-I port 210, the synchronization signal detection unit 250 and the switching control unit 260 according to the synchronization signal (H-sync) of the video signal are connected to the PC. The image format (digital / analog signal) inputted from 100 is detected and a driving control signal is output to the switching unit 240.

First, when the video signal format of the PC 100 is an analog signal, the DDC lines SCL and SDA are provided through the switching unit 240 according to the control signal High output from the switching controller 260. The analog EDID connected to the first memory unit 220 and stored in the first memory unit 220 is transmitted to the PC 100.

This operation is described in detail with reference to the waveform diagram of FIG. 3 as follows.

When the signal input to the DVI-I port 210 is a video signal in analog format, a horizontal synchronization signal (H-Sync) is input, and the horizontal synchronization signal is input to the inverter 251. The inverter 251 is used as a kind of buffer so as not to affect the horizontal synchronization signal processing of other parts. When the horizontal synchronizing signal H-sync is input as a negative waveform, it is input as a waveform of A of FIG. 3, and when it is input as a positive waveform, it is input as a waveform as A 'of FIG. 3, respectively. Inverted and buffered).

The output of the inverter 251 is applied to the input of the XOR gate 252, at which time the output signal of the inverter 251 is directly applied to one input terminal of the XOR gate 252, and the resistor R1 is applied to the other input terminal. And low pass filtering by an integrating circuit comprising a condenser (C1), and in the case of A waveform, it is DCized like a B waveform, and in the case of A 'waveform, it is DCized like a B' waveform and the other input terminal of the XOR gate 252. Is entered.

Since the XOR gate 252 performs an exclusive OR operation on input signals of both input terminals, the output of the XOR gate 252 always maintains a horizontal sync signal waveform detected in a positive form regardless of the polarity of the input horizontal sync signal, such as a C waveform. Since the horizontal sync signal frequency applied to the monitor is 30 to 100 kHz, this circuit configuration is made possible by the R and C integrators.

The output of the XOR gate 252 is converted like a D waveform through an integrator composed of a resistor R2 and a capacitor C2 of the switching controller 260. Here, by appropriately setting the R2 and C2 time constant values, the inverter 261 like the D waveform is adjusted so as to recognize the horizontal synchronization signal input as low.

Then, the output of the inverter 261 is always high when there is a horizontal sync signal (H-sync), and low when there is no horizontal sync signal (H-sync). Since the case described so far is an analog input, since a horizontal sync signal (H-sync) is input, a high signal is eventually output from the switching controller 260 as a signal for driving the switching unit 240. The switching unit 240 is switched to the first memory unit 220 by the high signal, and the analog EDID stored in the first memory unit 220 is transmitted to the PC 100.                     

On the other hand, when the image format of the PC 100 is a digital signal, as described above, since the output of the switching controller 260 is low, the switching unit 240 switches to the second memory unit 230 and the DDC. Lines SCL and SDA are connected to the second memory unit 230 through the switching unit 240, and the digital EDID stored in the second memory unit 230 is transmitted to the PC 100.

The PC 100 determines the display characteristics of the monitor according to the digital / analog EDID transmitted from the monitor 200 and outputs an image signal through the DVI-I port 210 accordingly.

The monitor 200 displays the video signal on a screen through a series of video processing processes.

The display data processing apparatus of the monitor according to the present invention as described above has the effect of improving the reliability of the product because a complete interface between the monitor and the PC is made irrespective of the digital / analog video signal input.

In addition, the monitor display data processing apparatus of the present invention is convenient because it automatically connects the DVI-I port to the analog EDID memory unit or the digital EDID memory unit by using the result of detecting the horizontal synchronization signal.

Claims (4)

Video input / output means for receiving a digital or analog video signal from a PC and outputting corresponding display related information to the PC; First memory means for storing analog display related information and second memory means for storing digital display related information; Switching means for connecting any one of said first and second memory means to said video input / output means; Sync signal detecting means for detecting and recognizing a horizontal sync signal (H-sync) for determining a video signal format inputted through the video input / output means; And a switching control means for receiving the output of the synchronization signal detecting means and checking the horizontal synchronization signal input to control the switching means to output the display related information according to the video format to the PC. The synchronizing signal detecting means includes an integrating circuit for integrating a horizontal synchronizing signal and an XOR gate for performing an exclusive OR operation on the signal integrated with the horizontal synchronizing signal as an input, And the switching control means comprises an integrating circuit for integrating the synchronous signal detected by the horizontal synchronizing signal detecting means and an inverter for outputting the switching means driving signal by inputting the integrated signal. Display data processing device. The display data processing device of a monitor according to claim 1, wherein said video input / output means is a DVI-I port. The display data processing apparatus of claim 1, wherein the display related information is an EDID. delete

Images