KR20020013275A - A apparatus and method for transmitting optical signal of graphic signal - Google Patents

Abstract

PURPOSE: A device and a method for optical transmission of graphic signals are provided to transmit graphic signals transmitted through multiple channels employing a single optical channel by the same hardware specifications. CONSTITUTION: An optical graphic signal transmitting device comprises a graphic chip-set(20) outputting graphic signals, a first memory(21) storing the graphic signals output from the graphic chip-set, a transmitter interface(22) transmitting the graphic signals via an optical channel after comparing the present graphic signals to the prior graphic signals stored in the first memory, compressing the graphic signals, and modulating the graphic signals in a channel, a receiver interface(23) converting the graphic signals transmitted from the optical channel into the original graphic signals, a second memory(24) storing the original graphic signals, and a display unit(25) displaying the graphic signals output from the receiver interface and the second memory. By modulating the graphic signals into a single optical channel instead of plural channels by the same hardware specifications, signal interference in respective channels and electromagnetic waves are removed. Therefore, tele-transmission and connection to the exterior become easy.

Description

Apparatus and method for transmitting optical signal of graphic signal

The present invention relates to an apparatus and method for graphic signal interface, and more particularly, to an apparatus and method for transmitting an optical signal of a graphic signal for transmitting a graphic signal to a display device using one optical channel.

In the case of transmitting the graphic signal separated by several channels by the electric cable, when the graphic signal is transmitted with the high speed graphic signal, the interference of the signal occurs due to the mutual influence between the channels, the skew caused by the transmission delay between the channels, and the electromagnetic wave by the electric cable. There is a possibility of damage to peripheral devices due to the increased radiation amount, and the structure of the connector is complicated to connect several channels.

1 is a block diagram showing the configuration of a conventional graphic interface device.

A parallel graphic signal consisting of a three-channel 24-bit graphic signal, a clock signal, and a control signal of RGB generated from the graphic chip 10 is serially connected to the three graphic signal channels and one clock channel through the graphic signal transmitting means 11. The signal is converted into a graphic signal and transmitted to the display device. The transmitted graphic signal is restored by the graphic signal receiving means 12 to the original parallel graphic signal and transmitted to the display means 13.

The prior art is composed of three channels by assigning the basic index RGB of the graphic to each channel, and based on electrical shielding and cable shielding to reduce mutual interference effects and electromagnetic waves. In order to match the impedance of the graphic signal transmitting means 11 and the graphic signal receiving means 12, the terminal impedances of the computer (not shown) and the display means 13, which are graphic signal generating apparatuses, must be adjusted according to the cable type. It has a structure vulnerable to transmission. At present, about 5m is known as the maximum transmission distance.

As described above, the conventional technology is composed of three channels of electrical cables by assigning RGB, which is the basic color of graphics, to each channel. When a high speed graphic signal is transmitted, the distortion of the graphic signal and a large amount of electromagnetic waves are affected by electrical mutual interference. Are likely to emit and adversely affect the peripherals. In addition, an apparatus for compensating transmission delay for each channel is essential. Therefore, in order to reduce such mutual interference, transmission delay between channels, and electromagnetic wave generation, there is a problem in that an electric shield and a cable shield should be basically applied. In addition, since the impedance matching between the graphic signal transmitting means 11 and the graphic signal receiving means 12 is difficult, there is a difficulty in adjusting the terminal impedance state of the computer and the display means 13 according to the cable type, and there is a problem that is vulnerable to long distance transmission. there was

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an apparatus for transmitting an optical signal of a graphic signal that transmits a graphic signal transmitted through a plurality of channels using one optical channel with the same hardware specification.

Another technical problem to be achieved by the present invention is to provide an optical transmission method of a graphic signal that transmits a graphic signal transmitted through a plurality of channels using one optical channel with the same hardware specification.

1 is a block diagram showing the configuration of a conventional graphic interface device.

2 is a block diagram showing a configuration of an optical transmission device of a graphic signal according to the present invention.

3 is a view for explaining the operation of the optical signal transmission method of the graphic signal according to the present invention.

4 is a diagram illustrating a first embodiment of the graphic data transmission format of FIGS. 2 and 3.

FIG. 5 is a diagram for describing a graphic data transmission format of FIG. 5.

FIG. 6 is a diagram illustrating a second embodiment of the graphic data transmission format of FIGS. 2 and 3.

FIG. 7 is a diagram for describing a graphic data transmission format of FIG. 6.

The present invention provides a graphic signal optical transmission apparatus for transmitting a predetermined graphic signal to a display means through a single optical channel, and compares a current graphic signal with a previous graphic signal. Transmission interface means for compressing the signal and then modulating it into one channel with a predetermined control signal and transmitting it to the optical channel; And a receiving interface means for converting the graphic signal transmitted from the one optical channel into an original graphic signal and transmitting it to the display means.

In another aspect of the present invention, there is provided a method of transmitting a graphic signal to a display means through a single optical channel, the method comprising: (a) transmitting a current graphic signal to a display means; Comparing / compressing with a graphic signal and modulating a single channel with a predetermined control signal and transmitting the same to the optical channel; And (b) converting the graphic signal transmitted from the one optical channel into an original graphic signal and transmitting it to the display means.

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

2 is a block diagram showing a configuration of an optical transmission device of a graphic signal according to the present invention.

The apparatus shown in FIG. 2 includes a graphics chipset 20 for outputting a graphics signal, first storage means 21 for storing graphics signals output from the graphics chip set 20, and a current graphics signal. 1 Transmission side interface 22 which compares / compresses the previous graphic signal stored in the storage means 21 and modulates it into one channel with a predetermined control signal and transmits it to the optical channel, and the graphic transmitted from one optical channel Graphic signal output from the receiving interface 23 for converting the signal into the original graphic signal, the second storage means 24 for storing the original graphic signal, the receiving interface 23 and the second storage means 24. It comprises a display means 25 for displaying the.

In the present invention, the transmitting-side interface 22 is a compression means for compressing the data to be transmitted by comparing the pixel data of the previous frame stored in the first storage means 21 with the current frame of the graphics signal output from the graphics chipset 20 (22-1), encoding means 22-2 for encoding the transmission data output from the compression means 22-1 and a predetermined control signal to be suitable for the optical channel, and a signal output from the encoding means 22-2. Serialization means 22-3 for serializing the signal to one optical channel, and optical connector transmission means 22-4 for converting the signal output from the serialization means 22-3 into an optical signal and transmitting the optical signal to the optical channel. It consists of.

In the present invention, the receiving interface 23 is provided in the optical connector receiving means 23-1 and the optical connector receiving means 23-1 for receiving a compressed optical graphic signal transmitted through one channel and converting the compressed optical graphic signal into an electrical graphic signal. Parallelization means 23-2 for converting the output signal into the original parallel graphic signal, decoding means 23-3 and decoding means 23 for converting the signal output from the parallelization means 23-2 into the actual graphic signal. Restoring means (23-4) for restoring the compression of the output signal of -3) and the signal stored in the second storage means (24) and transmitting it to the display means (25).

3 is a view for explaining the operation of the optical signal transmission method of the graphic signal according to the present invention.

4 is a diagram illustrating a first embodiment of the graphic data transmission format of FIGS. 2 and 3.

FIG. 5 is a diagram for describing a graphic data transmission format of FIG. 5.

FIG. 6 is a diagram illustrating a second embodiment of the graphic data transmission format of FIGS. 2 and 3.

FIG. 7 is a diagram for describing a graphic data transmission format of FIG. 6.

Next, the present invention will be described in detail with reference to FIGS.

The compression unit 22-1 compares the current frame of the graphic signal output from the graphic chipset 20 with the pixel data of the previous frame stored in the first storage unit 21, and then selects 3 of the pixel data signals to be changed. Only information of bits (or 2 bits and 4 bits) is selected and the amount of transmitted data is compressed into three channels, three bits and a sum of nine bits.

The encoding means 22-2 includes a bit (PID) for confirming the transmission data output from the compression means 22-1 and the position information of the changed pixel, a data enable bit (DE) of the digital graphic signal, horizontal and vertical. The DC signal balances the sync signals (HSYN, VSYN) and the extra control bits (CTRL).

Therefore, 16 bits of the compressed graphic signal and 9 bits of the control signal are transmitted according to the graphic signal transmission format of FIG. 4 through the coding process of the encoding means 22-2. The 7-bit control signal is a bit (DCB; 1 bit) that DC-balances the compressed graphic signal to the optical channel, the data enable bit (DE; 1 bit) of the digital graphic signal, and the horizontal and vertical sync signal (HSYN). 2 bits), an extra control bit (CTRL; 1 bit), and a bit (PID; 2 bits) confirming pixel position information.

In the case of the R channel illustrated in FIG. 3, a change occurs in comparing frame 0 with frame 1 to transmit upper MSB 3 bits 111B of frame 1. FIG. At this time, the position of the transmission graphic signal is identified using PID bits indicating information on which of the 8 bits of the original signal is a 3-bit graphic signal. As shown in the description of FIG. 5, if the transmission data is MSB 3 bits, PID 10B, NEXT 3 bits, PID 01B, and LSB 3 bits, PID 00B.

When the next graphic frame 2 is input, the signal of the frame 1 processed in the process of inputting the signal of the frame 2 is stored in the first storage means 21 and is waiting for comparison with the information of the frame 2. If there is no change comparing Frame 1 and Frame 2, the next NEXT 3 bit information 111B is transmitted (in this case with PID 01B), and if the information of Frame 2 and Frame 1 is changed as shown in FIG. The MSB 3 bits of frame 2 are transmitted without transmitting 3 bits.

When the signal of the next frame 3 changes compared to the previous frame 2, the MSB 3 bits of the frame 3 are transmitted again. Through this operation, the graphic signal of all 24 bits is 9 bits of graphic signal, 2 bits of PID, 1 bit of extra control signal (CTRL), 2 bits of sync signal (HSYNC, VSYNC), 1 bit of DC balance signal (DCB). In this case, the sum of the 1-bit data enable signal DE of the digital graphic signal is converted into a 16-bit abbreviated signal and transmitted.

The serialization means 22-3 serializes the 16-bit parallel signal output from the encoding means 22-2 in order to transmit one channel. The optical connector transmitting means 22-4 converts the serialized electric graphic signal into an optical signal and transmits it to the one-channel optical fiber.

The optical graphic signal transmitted to the 1-channel optical fiber is converted into an electrical graphic signal by the optical connector receiving means 23-1. The parallelizing means 23-2 converts the signal output from the optical connector receiving means 23-1 into the original 16-bit parallel graphic signal. The decoding means 23-3 converts the 16-bit parallel graphic signal output from the parallelization means 23-2 into a 9-bit actual graphic signal.

The recovery means reproduces the original 24-bit RGB signal from the 9-bit graphic signal. At this time, the changed 3-bit signal finds a position to be corrected through the PID and drives the display means 25.

FIG. 6 shows a graphic signal transmission format different from that of FIG. 4, and FIG. 7 shows a description thereof. In the graphic signal transmission format of FIG. 6, 2 bits of changed pixel information are selected and transmitted. The selection of the changed pixel information may be arbitrarily determined according to a user's setting command. When 2 bits of the changed pixel information are used, 16 bits of data of 6 bits of graphic signal and 7 bits of control signal are transmitted. At this time, the changed pixel information can be tracked by PID. If the PID is 11B, MSB 2 bits, if PID is 10, NEXT1 2 bits, if PID is 01, NEXT2 2 bits, and PID is 00, LSB 2 bits. Can be.

The present invention is not limited to the above-described embodiments and can be modified by those skilled in the art within the spirit of the invention.

As described above, according to the present invention, when a graphic signal is modulated and transmitted to one optical channel instead of the existing multiple channels with the same hardware specification, signal interference and electromagnetic waves for each channel are eliminated, and long-distance transmission and external connection are easily performed. It can work.

Claims (13)

An apparatus for transmitting a predetermined graphic signal to a display means via one optical channel, Transmission interface means for comparing / compressing a current graphic signal with a previous graphic signal and then modulating it into one channel with a predetermined control signal and transmitting the resultant signal to the optical channel; And And a receiving interface means for converting the graphic signal transmitted from said one optical channel into an original graphic signal and transmitting it to said display means. The method of claim 1, wherein the transmission interface means Compression means for compressing predetermined transmission data by comparing pixel data of a previous frame with a current frame of the graphic signal; Encoding means for encoding the compressed transmission data and a predetermined control signal appropriately for the optical channel; Serialization means for serializing the encoded signal for transmission on one optical channel; And And optical transmission means for converting the serialized signal into an optical signal and transmitting the optical signal to the optical channel. 3. The transmission interface of claim 2, wherein the transmission interface means And a first storage means for storing the frame data of the previous step. The method of claim 2, wherein the compression means And comparing the pixel data of the previous frame with the current frame and compressing the changed pixel data into any one of predetermined MSB, NEXT, and LSB bits to output the compressed pixel data. 5. The apparatus of claim 4, wherein the MSB, NEXT, and LSB bits output from the compression means are set differently in number of bits by a predetermined setting command. 3. The control signal according to claim 2, wherein the predetermined control signal encoded by the encoding means comprises a signal for confirming the changed position information of the pixel data, a horizontal and vertical synchronization signal, a data enable signal, and the pixel data suitable for the optical channel. An optical transmission device of a graphic signal, characterized in that consisting of a DC balancing signal, and other redundant control signals. The method of claim 1, wherein the receiving interface means Optical receiving means for receiving the compressed optical graphic signal transmitted through the one channel and converting the compressed optical graphic signal into an electrical graphic signal; Parallelization means for converting the electrical graphic signal into an original parallel graphic signal; Decoding means for converting the parallelized graphic signal into an actual graphic signal; And And restoring means for restoring compression of the decoded graphic signal and transmitting the decompressed graphic signal to the display means. The method of claim 7, wherein the receiving interface means And second storage means for storing the graphic signal output from said decoding means. A method of transmitting a predetermined graphic signal to a display means via one optical channel, (a) comparing / compressing a current graphic signal with a previous graphic signal and then modulating it into one channel with a predetermined control signal and transmitting the same to the optical channel; And (b) converting the graphic signal transmitted from the one optical channel into an original graphic signal and transmitting the graphic signal to the display means. The method of claim 9, wherein step (a) (a-1) compressing predetermined transmission data by comparing pixel data of a previous frame with a current frame of the graphic signal; (a-2) encoding the compressed transmission data and a predetermined control signal appropriately for the optical channel; (a-3) serializing the encoded signal for transmission on one optical channel; And (a-4) converting the serialized signal into an optical signal and transmitting the optical signal to the optical channel. The method of claim 10, wherein step (a-1) And comparing the pixel data of the current frame with the previous frame and compressing the changed pixel data into one of predetermined MSB, NEXT, and LSB bits and outputting the compressed data. 12. The optical transmission method of claim 11, wherein the MSB, NEXT, and LSB bits, which are compressed and output, are set differently according to a predetermined setting command. The method of claim 9, wherein step (b) (b-1) receiving the compressed optical graphic signal transmitted through the one channel and converting the compressed optical graphic signal into an electrical graphic signal; (b-2) converting the electrical graphic signal into an original parallel graphic signal; (b-3) decoding converting the parallelized graphic signal into an actual graphic signal; And (b-4) decompressing the decoded graphic signal and transmitting the decompressed graphic signal to the display means.