KR20050049914A - Display system using screen split serial transmission form and displaying method thereof - Google Patents

Abstract

The present invention is to provide a screen display system and a display method using a screen divided serial transmission method that can overcome the problem that the circuit configuration is complicated by performing the RGB conversion on the display unit, that is, the receiver side and improve the applicability thereof. To this end, the present invention, the image processing unit for controlling the image quality of the image data input in the format of the luminance and chrominance signal, converts to the RGB format and outputs; A screen division unit for dividing the screen image data converted into the RGB format according to a vertical / horizontal synchronization signal to conform to an international standard serial digital transmission standard, and converting the image data into a predetermined bit of serial data; A serial transmitter for transmitting the serial data according to a 1-bit serial transmission standard; And a data converter for receiving the transmitted serial data and converting the serial data into parallel data. And a display unit for receiving the parallel data and displaying the same on the screen.

In addition, the present invention provides a screen display method using a screen split serial transmission method.

Description

Screen display system and display method using split screen serial transfer method {DISPLAY SYSTEM USING SCREEN SPLIT SERIAL TRANSMISSION FORM AND DISPLAYING METHOD THEREOF}

The present invention relates to a screen display method, and more particularly, to a screen display system and a display method using a screen split serial transmission method.

In general, in addition to the RGB format used for color television, there are YUV format, YIQ format, YCrCb format, and CMYK format used for color printers.

The RGB format expresses colors as data signals of R (Red), G (Green), and B (Blue), which implement colors, but the YUV format uses the Y signal, which is a brightness component, and two U and V signals, which are color components. To transmit color data.

On the other hand, the YUV signal is a signal system mainly used in the PAL method, and the PAL method is a standard method of broadcasting signals used in other European countries except France and some eastern European countries. It is a method of inverting and modulating each scan line, which is incompatible with black-and-white television, but has a feature of less influence of a video signal on phase distortion caused by recording or transmission paths.

In order to express the above-described YUV signal, for example, on a television screen, it is necessary to convert it to an RGB signal. The standardization standard for this conversion is shown in ISO / IEC 13818-2.

R = (70639 (Y-16) + 117504 (V-128) + 32768) / 2 ¹⁶

G = (70639 (Y-16)-13954 (U-128)-34903 (V-128) + 32768) / 2 ¹⁶

B = (70639 (Y-16) + 138453 (U-128) + 32768) / 2 ¹⁶

That is, each signal of RGB is calculated through a calculation process such as multiplying or dividing each signal of YUV by a predetermined value.

 On the other hand, in the conventional method of expressing image data on a display device including an electronic board or the like, the transmitting side transmits the image data in a luminance + color difference format such as YUV or YCrCb, and the receiving side, that is, the above-described Equation 1 Logic operation that satisfies the standardization specifications such as color space change and gamma correction must be converted to RBG and displayed. This causes a problem that complicates the circuit configuration of the reception side display station.

In addition, since the receiver should control the image data sent from the transmitter, it is difficult to proactively cope with changes in external conditions as well as the integration of the receiver in the actual application, thereby revealing many limitations in actual applications.

The present invention has been proposed to solve the above-mentioned problems, and the screen division serial transmission method for overcoming the problem that the circuit configuration is complicated by performing RGB conversion at the display unit, that is, the receiver, and improving the applicability thereof is provided. It is an object of the present invention to provide a used screen display system and display method.

In order to achieve the above object, the present invention, the image processing unit for controlling the image quality of the image data input in the format of the luminance and chrominance signal, converts to the RGB format and outputs; A screen division unit for dividing the screen image data converted into the RGB format according to a vertical / horizontal synchronization signal to conform to an international standard serial digital transmission standard, and converting the image data into a predetermined bit of serial data; A serial transmitter for transmitting the serial data according to a 1-bit serial transmission standard; And a data converter for receiving the transmitted serial data and converting the serial data into parallel data. And a display unit for receiving the parallel data and displaying the same on the screen.

In addition, the present invention to achieve the above object, the first step of controlling the image quality of the image data input in the format of the luminance and chrominance signal and converting to the RGB format; A second step of dividing the image data converted into the RGB format according to a vertical / horizontal synchronization signal to conform to an international standard serial digital transmission standard, and converting the image data into a predetermined bit of serial data; A third step of transmitting the serial data in accordance with a 1-bit serial transmission standard; A fourth step of receiving the transmitted serial data and converting the serial data into parallel data; And a fifth step of receiving the parallel data and displaying the same on the screen.

The present invention is based on the serial transmission of the image data transmitted to the display device by splitting the screen. The conventional transmission standard and the line method are the same, but the conventional data format such as YCrCb expressing the data transmission format in terms of luminance and color difference. Alternatively, by converting from YUV to RGB format and transmitting the data, the circuit configuration of the receiving side can be simplified by eliminating the reprocessing of the received data such as color space conversion and gamma correction on the data receiving side.

In addition, by adopting the screen division transmission method, the size (pixel number) of the display screen can be enlarged, and the image standard of the high-definition TV (HDTV) can also be expressed. The display device may be controlled on the host side by inserting a control signal into the transport packet.

On the other hand, the receiving side (display device) receives the image data serially on the screen unit divided by the transmitting side. The split screen unit is divided into display unit units, and the display unit is a structure that displays only a part corresponding to the assigned x, y coordinate area as an image, and the display unit separates the received serial image data into RGB and controls the signal. By controlling the gradation of the module such as the LED attached to the combination, to display an image.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. .

1 is a block diagram schematically illustrating a display system using a split screen serial transmission method according to an embodiment of the present invention.

Referring to FIG. 1, a display system according to an exemplary embodiment of the present invention may include an image processor 10 for controlling image quality of image data input in a format of luminance + color difference signal such as YUV or YCrCb, and converting the image data into an RGB format for output. ) And a screen splitter 11 for dividing the screen image into RGB data according to the vertical / horizontal sync signal and converting the image data into n-bit serial data according to the international standard serial digital transmission standard. ), A serial transmission unit 12 for transmitting n-bit serial data in accordance with a 1-bit serial transmission standard, and a data converter 13 for receiving the transmitted 1-bit serial data and converting the data into parallel data. And a display unit 14 for receiving parallel data and displaying the same on the screen.

FIG. 2 is a block diagram illustrating a connection relationship between the image processor, the screen divider, and the serial transmitter of FIG. 1.

Referring to FIG. 2, a signal in which analog image data is output through an A / D changer and a synchronization / clock generator, and a signal in which digital serial image data is output through a single document interface (SDI) input / converter and a synchronization / clock generator are output. It is input to the image processor 10, and outputs RGB image data, a dot clock, and a vertical / horizontal sync signal through an output terminal of the image processor 10.

In other words, the image processing unit 10 digitizes the source of the input image data and adjusts the size of the image according to the size of the display such as an electronic display panel to display it, a deinterlacing function to convert from interlaced scanning to sequential scanning, and gamma. Correction function Controls image quality such as color space conversion function, color tone adjustment function, brightness or contrast.

The screen dividing unit 11 is composed of a plurality of screen dividing blocks 11_1 to 11_n, and each of the screen dividing blocks 11_1 to 11_n includes display unit control signals, RGB image data, and dots output from the control signal generating unit 22. It receives clock and vertical / horizontal sync signals and outputs n bits of serial data.

The serial transmission unit 12 includes a plurality of unit serial transmission units 12_1 to 12_n corresponding to each of the screen division blocks 11_1 to 11_n one-to-one, and each of them has a plurality of transmission ports (transport ports 1 to transmission port). n) One-to-one correspondence sends serial data to the corresponding port.

3 is a detailed block diagram of the screen divider 11 of FIG. 1.

Referring to FIG. 3, the screen dividing unit 11 receives image data (eg, 10 bits) converted into an RGB format output from the image processing unit 10, a vertical / horizontal synchronization signal, and a dot clock. A write clock 110 for outputting a write clock for recording image data converted into an RGB format in memory in accordance with a synchronization signal, a read reset signal for synchronizing with the passed RGB image data and a read processing section, and a write clock A memory unit 111 for storing 30-bit RGB image data, a read clock for reading RGB image data from the memory unit 111, a read-out RGB image data and a vertical / horizontal sync signal A read processing unit 112 for formatting and converting the data into 10 bits of serial data, and a control signal generator 22 for generating a display control signal and providing the read processing unit 112 to the read processing unit 112.

The configuration and operation of the screen division unit 11 described above will be described in detail.

Basically, it is composed of a write processor 110 (write processor), a memory unit 111 (memory block), and a read processor 112 (Read processor) for recording image data in units of 480x240.

Image data in the RGB format processed by the image processing unit (see reference numeral 10 in FIG. 1) is configured to conform to the international standard serial digital transmission standard, for example, horizontal 480 dots vertical 240 lines in accordance with the vertical / horizontal synchronization signal. The image data is divided (Write, Write) to the memory unit 111, and the image data stored in the memory unit 111 is read in order to transmit the associative data.

The recording processing unit 110 is configured to synchronize the RGB image data and the read processing unit 112 with a write clock for writing RGB image data to the memory unit 111 according to the vertical / horizontal synchronization signal. Outputs a read reset signal.

The memory unit 111 records and stores RGB image data in synchronization with the write clock output from the recording processing unit 110.

The read processing unit 112 formats the read clock for reading image data from the memory unit 111, the read RGB image data, the vertical / horizontal synchronization signal, and the display control signal according to the 10-bit serial transmission standard. Formatting) and generating transmission control signal for transmitting 10-bit serial data.

In the present invention, the 10-bit serial image data uses the image data processed in the RGB format instead of the conventional YUV or YCrCb format image data. It can be seen that the image processing is not performed.

4 is a block diagram illustrating the serial transmission unit 12 of FIG. 1.

Referring to FIG. 4, the serial transmission unit 12 receives and stores 10-bit serial data of 'D0 to D9' provided from the screen division unit (see reference numeral '11' in FIG. 1). In response to the synchronization signal provided from the synchronization detection unit 121 and the synchronization detection unit 121 for detecting a synchronization signal among the 10-bit serial data of 'D0 to D9' from the input data register 120; SMPTE polynomial generator 122 for combining the image data provided from the input data register 120 to satisfy the SMPTE standard and the combined image data output from the SMPTE polynomial generator 122. Serializer / NRZ (Non-Return-tp-Zero Inverted) Converter 124 for receiving and converting to 1-bit serial data and outputting the serializer / NRZ-NRZI Converter ( Buffer the output of 124) The output buffer 125 for outputting the dual data and the input 10-bit data are converted into, for example, 27 bits to 1-bit data, so that the frequency is 10 times 270 MHz. Voltage-controlled oscillator 128 (hereinafter referred to as VCO) for providing to / NRZ-NRZI converter 124, divider 127 for dividing output of VCO 128, and VCO 128 A phase frequency detector 126 for detecting the output of the frequency divider 127 and controlling the VCO 128 in response to the transmission control signal to match the phase of the output serial data with the phase of the frequency provided by do.

In other words, the serial transmission unit 12 receives the 10-bit serial data and the transmission control signal output from the read processing unit 112 of the screen division unit 11 and receives 1-bit serial data that satisfies the serial transmission standard (SMPTE259M). send.

Table 1 below shows a parallel interface format.

One 2 3 4 5 6 7 8 9 10 11 .... 1438 1439 1440 Cb0 Y0 Cr0 Y1 Cb2 Y2 Cr2 Y3 Cb4 Y4 Cr4 .... Y718 Cr718 Y719

In the case of the 10-bit parallel interface format of BT.656 and SMPTE125M, the image data format of one horizontal line constitutes the interface format by arranging the image data in the order shown in Table 1 above.

The effective image data of one horizontal line is composed of 1440 parallel clocks, and has a structure having a total of 720 pixel data.

Meanwhile, in the present invention, in the above-described format of Table 1, R, G, and B image data are arranged instead of Y, Cb, and Cr to form a 10-bit parallel interface format, and are represented as shown in Table 2 below.

One 2 3 4 5 6 7 8 9 10 11 .... 1438 1439 1440 R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 .... G479 G479 B479

As shown in Table 2, in the present invention, the effective image data of one horizontal line is composed of 1440 parallel clocks and has a structure of 480 pixel data in total.

FIG. 5 is a detailed block diagram showing the data converter 13 of FIG.

Referring to FIG. 5, the data converter 13 amplifies the output of the input buffer 139 and the input buffer 139 which receives and buffers 1-bit serial data transmitted through the serial transmitter 12. An output buffer 138 for outputting through the " OUT1 " and " OUT2 " terminals, and an equalizer 130 for equalizing or weakening the distortion or amplitude of the buffered 1-bit serial data. Inputs 1-bit serial data 'SDATA' and synchronous clock 'SCLK' compensated for phase distortion through 130, and converts 1-bit serial data into 10-bit serial data in response to the synchronous clock 'SCLK'. The serial data converter 131 for generating the synchronous clock 'P-CLK' and the 10-bit serial data which are the outputs of the serial data converter 131 are received and converted into 10-bit parallel data. Create 'Clkt' Parallel data converter 132, 10-bit parallel data, timing clock 'Clkt', and synchronization clock 'P-CLK' are inputted from the 10-bit parallel data. And a data separator 133 for separating the signal and RGB image data of 10 bits.

Here, the data separator 133 is composed of a logic circuit, and the state display unit 134 receives the outputs of the equalizer 130 and the data separator 133 to display the operation states of the reception and image display signals.

Unexplained reference numerals 1135 and 137 denote memory, and reference numeral 136 denotes a central processing unit (CPU).

The display unit (refer to '14' in FIG. 1) includes a gray scale generator for generating gray scale data by receiving a display control signal, a dot clock, vertical / horizontal sync signals, and RGB image data, and controlling brightness of the gray scale data. And a display for displaying RGB grayscale data whose luminance is controlled.

6 is a block diagram illustrating a gray scale generator.

Referring to FIG. 6, the gray scale generator includes a memory block 60 and a memory control and gray data generating logic 61.

The gradation generator is a part for generating gradation data necessary for displaying an image to a module such as an LED by receiving the RGB image data separated by the data separator 133, a dot clock, a vertical / horizontal synchronization signal, and a display control signal. .

The RGB image data is stored in the memory block 60 according to the dot clock, the vertical / horizontal sync signal, and the display control signal, and the image data stored in the memory block 60 is grayed out so that the control logic is imaged to a module such as an LED according to an algorithm. It is generated as data that can be gradated. Since gradation is 10 bits in each color RGB, when it is expressed as gradation level, it becomes 2 ¹⁰ = 1024 steps.

7 is a diagram illustrating a connection state of signal data showing an example in which a display system using a screen division serial transmission method is applied to an electronic display system.

Referring to FIG. 7, the electronic display system receives a broadcast / video device unit 70 that collects video data and image data (VGA OUT, VIDEO OUT) provided from the broadcast / video device unit 70. Image processing / screen division / serial transmission unit 71 for processing and serial transmission using the transmission method, and image transmission / segmentation / serial transmission unit 71 for displaying data transmitted to a plurality of ports LED signboard 72 is included.

The broadcast / video device unit 70 switches the video data provided through the video camera 700, the satellite receiver 701, the online 702, the VTR 703, the DVD / LD 704, and the like to the switcher / router 706. ) May be displayed through the plurality of monitors 705 and displayed on the monitors 708 and 709 via the image editing apparatus 707.

The image processing / screen division / serial transmission unit 71 performs the operation described with reference to FIGS. 1 to 5 as described above. Here, only the serial transmission unit 711 and the monitor 710 performing the RS-232C control operation are shown. It was.

The front 721 and rear 720 of the LED sign 72 is shown, the rear is composed of a split screen divided into a plurality of ports, each split screen receives serial data and performs parallel conversion An apparatus 722 for controlling gradation and displaying an image is disposed. The front panel displays the image data provided using the LED.

8 is a flowchart illustrating a screen display method using a screen split serial transmission method according to an embodiment of the present invention.

Referring to FIG. 8, the screen display step using the split screen serial transmission method may include controlling image quality of image data input in YUV or YCrCb format, which is a format of luminance and color difference signals, and converting the image data into an RGB format (S80); Splitting the image data converted into RGB format according to the vertical / horizontal synchronization signal to conform to the international standard serial digital transmission standard, and accordingly converting the image data into a predetermined bit of serial data (S81); and serial data Converting the data according to the 1-bit serial transmission standard (S82), transmitting (S83), converting serial data of the transmitted RGB format into parallel data (S84), and receiving parallel data It consists of a step (S85) displayed on. Here, 10-bit image data will be described as an example, and application to a plurality of Ns (N is a natural number) is also possible.

10-bit serial data is converted according to the 1-bit serial transmission standard (S82), and in the step of transmitting (S83), the image data converted to the RGB format, the vertical / horizontal sync signal, and the dot clock are received. A write clock outputs a write clock for recording the image data converted into the RGB format in memory in accordance with the horizontal synchronization signal and a read reset signal for synchronizing with the passed RGB image data and the read processing section.

In addition, the RGB image data is stored in the memory unit in synchronization with a write clock, and the read clock unit reads the RGB image data from the memory unit and formats the read RGB image data and the vertical / horizontal sync signal. Converts to serial data of bits.

In step S84 of receiving the transmitted RGB data serial data and converting the serial data into parallel data, converting the transmitted 1-bit serial data into 10-bit serial data, generating a synchronization clock, and then generating the 10-bit serial again. The data is converted into 10-bit parallel data, and the display unit control signal, dot clock, vertical / horizontal sync signal, and video data are separated from the 10-bit parallel data.

According to the present invention made as described above, image data transmitted to a display device such as an electronic board is divided into serial transmissions, and the conventional transmission standard and the line method are the same, but the conventional data expressing the data transmission format with luminance and color difference. By changing the format of RGB and transmitting it to the receiving side without transmitting the data in YCrCb or YUV format, the receiving side can omit the reprocessing of the received data such as color space conversion and gamma correction on the receiving side. The circuit configuration can be simplified, and by adopting the split screen transmission method, the size (pixel number) of the display screen can be enlarged, and the image standard of the high-definition TV can be expressed, and the display control signal is inserted into the transmission packet. The embodiment has been described that the display device can be controlled from the host side.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

According to the present invention as described above, in a system including a display device such as an electronic display board, the data transmission format is changed to RGB format without being transferred to YCrCb or YUV, which is a data format expressing luminance and color difference. By doing so, the circuit configuration of the receiving side can be simplified by eliminating the reprocessing of the received data such as color space conversion and gamma correction on the data receiving side. Since it can be enlarged, it is possible to express an image standard of a high-definition TV, and there is an effect of controlling the display device on the host side by inserting a display control signal into a transport packet.

1 is a block diagram schematically illustrating a display system using a screen split serial transmission method according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a connection relationship between an image processor, a screen divider, and a serial transmitter of FIG. 1.

FIG. 3 is a detailed block diagram illustrating the screen divider of FIG. 1. FIG.

4 is a block diagram illustrating the serial transmission unit of FIG. 1;

FIG. 5 is a detailed block diagram illustrating a data converter of FIG. 1. FIG.

6 is a block diagram showing a gray scale generator;

Fig. 7 is a diagram illustrating a connection state of signal data showing an example in which a display system using a screen division serial transmission method is applied to an electronic display system.

8 is a flowchart illustrating a screen display method using a screen split serial transmission method according to an embodiment of the present invention.

* Description of the main parts of the drawing

10: image processor 11: screen divider

12: serial transmission unit 13: data conversion unit

14: display unit

Claims (10)

Image processing means for controlling the image quality of image data input in the format of luminance and chrominance signal, converting the image data into an RGB format, and outputting the converted image; Screen dividing means for dividing the image data converted into the RGB format according to the vertical / horizontal synchronization signal to conform to the international standard serial digital transmission standard, and thereby converting the image data into a predetermined bit of serial data; Serial transmission means for transmitting the serial data in accordance with a serial transmission standard of 1 bit; And Data conversion means for receiving the transmitted serial data and converting the data into parallel data; And Display means for receiving the parallel data to display on the screen Screen display system using a split screen serial transmission method including a. The method of claim 1, The screen division means, Receiving image data converted to the RGB format output from the image processing means, the vertical / horizontal synchronization signal and the dot clock, and recording the image data converted to the RGB format according to the vertical / horizontal synchronization signal in a memory; A recording processing unit for outputting a read clock for synchronizing the write clock with the passed RGB image data and the reading processing unit; A memory unit for storing the RGB image data in synchronization with the write clock; And A read processing unit for reading the RGB image data from the memory unit, converting the read RGB image data and the vertical / horizontal synchronization signal into a predetermined bit serial data; Screen display system using a split screen serial transmission method comprising a. The method of claim 2, The read processing unit, And simultaneously formatting the display means control signal during formatting and outputting a transmission control signal for transmitting the serial data. The method of claim 2, The predetermined bit is 10 bits, the screen display system using a screen division serial transmission method. The method of claim 3, wherein The serial transmission means, And transmitting the serial data having a predetermined bit in accordance with the serial transmission standard of 1 bit in response to the transmission control signal. The method of claim 5, The data conversion means, A serial data conversion unit for converting the transmitted one bit of serial data into the predetermined bit of serial data and generating a synchronization clock; A parallel data converter for converting the serial data of the predetermined bit into parallel data of the predetermined bit; And A data separator for separating the display means control signal, the dot clock, the vertical / horizontal synchronization signal, and the image data from the parallel data of the predetermined bit; Screen display system using a split screen serial transmission method comprising a. A first step of controlling image quality of image data input in a format of a luminance and a color difference signal and converting the image data into an RGB format; A second step of dividing the image data converted into the RGB format according to a vertical / horizontal synchronization signal to conform to an international standard serial digital transmission standard, and converting the image data into a predetermined bit of serial data; A third step of transmitting the serial data in accordance with a 1-bit serial transmission standard; A fourth step of receiving the transmitted serial data and converting the serial data into parallel data; And A fifth step of receiving the parallel data and displaying the same on the screen; Screen display method using a screen split serial transmission method comprising a. The method of claim 7, wherein And the predetermined bit is 10 bits. The method of claim 7, wherein In the third step, A write clock for receiving the image data converted into the RGB format, the vertical / horizontal synchronization signal, and a dot clock, and writing the image data converted into the RGB format to a memory in accordance with the vertical / horizontal synchronization signal; Outputting a read reset signal for synchronizing with the RGB image data and the read processing unit through the recording processing unit, Storing the RGB image data in the memory unit in synchronization with the write clock; And a read clock for reading the RGB image data from the memory unit, and formatting the read and RGB image data and the vertical / horizontal synchronization signal to convert the predetermined image into serial data of the predetermined bit. Display method using serial transmission method. The method of claim 9, The fourth step, Converting the transmitted one bit of serial data into the predetermined bit of serial data and generating a synchronization clock; Converting the predetermined bit serial data into parallel data of a predetermined bit; And Separating the display means control signal, the dot clock, the vertical / horizontal synchronization signal, and the image data from the parallel data of the predetermined bit; Screen display method using a split screen serial transmission method comprising a.