KR100688787B1 - A method and apparatus for transposing data - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transpose device and a method thereof, in particular an RGB image input signal using DDR Double Data Rate Synchronous DRAMs (DDR SDRAM), which is advantageous in terms of cost, access speed, and storage capacity in an optical device using an optical modulator. The present invention relates to a data transposing device and an method of an optical device using an optical modulator to change the input data alignment.

Optical Modulators, Displays, DDR SDRAM

Description

Data transposing device of optical device using optical modulator and its method {A method and apparatus for transposing data}

1 and 2 show a typical configuration of an optical MEMS device applied to an optical switch and an optical modulation device by using light reflection or diffraction.

3 is a perspective view of a recessed diffraction type optical modulator using piezoelectric materials developed by Samsung Electro-Mechanics.

4A shows a structure in which image data input in a typical HDTV or the like is horizontally aligned, and FIG. 4B shows a structure in which 1080 micro mirror elements are arranged in a longitudinal direction.

FIG. 5A shows a structure of image data of one frame composed of 1920 X 1080 pixels, and FIG. 5B shows a structure in which the input image data is transposed from the horizontal arrangement to the longitudinal arrangement.

Fig. 6 shows an embodiment of the one-panel optical apparatus using the optical modulator to which the present invention is applied.

FIG. 7 is a configuration diagram of a control block in the optical device using the optical modulator of FIG.

8 is a block diagram of a data transpose apparatus according to an embodiment of the present invention.

FIG. 9A illustrates a data structure stored in the line double buffer of FIG. 8, FIG. 9B illustrates a data structure stored in the scan converter, and FIG. 9C illustrates a data structure in units of frames stored in the scan converter. 9D is a diagram showing the data structure of the DDR SDRAM, and FIG. 9E is a diagram showing the data structure including all the RGB signals of the DDR SDRAM.

10 is a flowchart of a data transposing method of an optical device using an optical modulator according to an embodiment of the present invention.

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

71: optical modulator 72: driver

73: flash memory 74: DDR SDRAM

75: galvanometer mirror 76: controller

81RA ~ 81BB: Line double buffer 82RA ~ 82BB: Scan converter

83A, 83B: DDR SDRAM Controller 84A, 84B: DDR SDRAM

85A, 85B: lead double buffer 86A, 86B: output buffer

87: time controller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transpose device and a method thereof, in particular an RGB image input signal using DDR Double Data Rate Synchronous DRAMs (DDR SDRAM), which is advantageous in terms of cost, access speed, and storage capacity in an optical device using an optical modulator. The present invention relates to a data transposing device and an method of an optical device using an optical modulator to change the input data alignment.

In accordance with the progress of microtechnology, attention has been paid to small devices incorporating so-called Micro Electro Mechanical Systems (MEMS) devices and MEMS devices.

A MEMS device is a device formed as a microstructure on a substrate such as a silicon substrate or a glass substrate, and electrically and mechanically coupled to a driver for outputting a mechanical driving force, a semiconductor integrated circuit for controlling the driver, and the like. A basic feature of the MEMS device is that a drive body constructed as a mechanical structure is assembled to a part of the device, and the drive of the drive body is performed electrically by applying the coulomb force between the electrodes.

1 and 2 show a typical configuration of an optical MEMS device applied to an optical switch and an optical modulation device by using light reflection or diffraction.

The optical MEMS element 1 shown in FIG. 1 includes a substrate 2, a substrate side electrode 3 formed on the substrate 2, and a driving side electrode arranged in parallel to the substrate side electrode 3 ( A beam beam 6 having 4) and a support 7 supporting one end of the beam 6 are formed. The beam 6 and the board | substrate side electrode 3 are electrically insulated by the space | gap 8 between them.

In the optical MEMS element 1, the beam 6 is displaced by electrostatic attraction or electrostatic repulsion between the substrate-side electrode 3 and the substrate-side electrode 3 depending on the potential applied to the substrate-side electrode 3 and the driving-side electrode 4. For example, as shown by the solid line and the broken line of FIG. 1, it displaces in parallel and inclined state with respect to the board | substrate side electrode 3, for example.

The optical MEMS element 11 shown in FIG. 2 includes a substrate 12, a substrate side electrode 13 formed on the substrate 12, and a beam 14 that spans the substrate side electrode 13 in a bridge shape. Achieve. The beam 14 and the board | substrate side electrode 13 are electrically insulated by the space | gap 10 between them.

The beam 14 is parallel to each other facing the substrate-side substrate 13 and the bridge member 15 made of, for example, a SiN film, which is placed on the substrate 12 by hanging the substrate-side electrode 13 in a bridge shape. It consists of the drive side electrode 16 provided on the bridge member 15 which also serves as the reflecting film which consists of Al film of about 100 nm thickness, for example. The beam 14 is formed in a so-called bridged manner with its ends supported.

In this optical MEMS element 11, the beam 14 is displaced by electrostatic attraction or electrostatic repulsion between the substrate side electrode 13 and the potential given to the substrate side electrode 13 and the driving side electrode 16. For example, as shown by the solid line and the broken line of FIG. 2, it displaces in parallel and concave state with respect to the board | substrate side electrode 3, for example.

In the optical MEMS elements 1 and 11, light is irradiated onto the surfaces of the driving side electrodes 4 and 16, which also serve as light reflection films, and the reflection directions of the light are different depending on the driving positions of the beams 4 and 14, respectively. The present invention can be applied as an optical switch that detects reflected light in one direction and has a switch function.

The optical MEMS elements 1 and 11 can be applied as optical modulators that modulate the light intensity. When the reflection of light is used, the beams 4 and 14 are vibrated to modulate the light intensity with the amount of reflected light in one direction per unit time. This optical modulation element is so-called time modulation.

When using diffraction of light, a plurality of beams 6 and 14 are arranged in parallel with respect to the common substrate side electrodes 3 and 13 to form an optical modulator, and an example of the common substrate side electrodes 3 and 13 is given. For example, the height of the driving electrode serving as the light reflection film is changed by the operation of the adjacent beams 6 and 14 in proximity and separation, and the intensity of the light reflected by the driving electrode is modulated by the diffraction of the light. This optical modulator is so-called spatial modulation.

Such an optical modulation device is a GLV (Grating Light Valve) device developed by SLM (Silicon Light Machine) Co., Ltd. (Domestic Application No. 10-2000-7014798) as a light intensity conversion device for laser display, that is, an optical modulator. In addition, there is a diffraction type optical modulator (Korean Patent Application No. P2003-077389) using piezoelectric materials developed by Samsung Electro-Mechanics.

3 is a perspective view of a recessed diffraction type optical modulator using piezoelectric materials developed by Samsung Electro-Mechanics.

Referring to FIG. 3, the recessed thin film piezoelectric optical modulator developed by Samsung Electro-Mechanics includes a silicon substrate 30 and a plurality of elements 32a to 32n.

Here, the plurality of elements 32a to 32n have a constant width and are aligned regularly to form a recessed thin film piezoelectric optical modulator. In addition, the plurality of elements 32a to 32n have different widths and are alternately arranged to form a recessed thin film piezoelectric optical modulator. In addition, the elements 32a to 32n may be spaced apart from each other at a predetermined interval (almost the same distance as the width of the elements 32a to 32n), and in this case, the micromirrors formed on the entire upper surface of the silicon substrate 30. The layer reflects the incident light and diffracts it.

The silicon substrate 30 has depressions in order to provide air space to the elements 32a to 32n, and an insulating layer 31 is deposited on the upper surface, and ends of the elements 32a to 32n on both sides of the depressions. Is attached.

Each element (herein, only the reference numeral 32a is described in detail, but the remaining 32b to 32n is the same) has a rod shape, and the lower surfaces of both ends are positioned so that the center portion is spaced apart from the recessed portion of the silicon substrate 30. A portion located at both sides of the silicon substrate 30 beyond the depression, and the portion located in the depression of the silicon substrate 30 includes a lower support 33a that is movable up and down.

In addition, the element 32a is stacked on the left end of the lower support 33a, and is laminated on the lower electrode layer 34a and the lower electrode layer 34a for providing a piezoelectric voltage, and contracts and A piezoelectric material layer 35a that expands to generate a vertical driving force, and an upper electrode layer 36a that is stacked on the piezoelectric material layer 35a and provides a piezoelectric voltage to the piezoelectric material layer 35a are included.

In addition, the element 32a is stacked on the right end of the lower support 33a, and is laminated on the lower electrode layer 34a 'and the lower electrode layer 34a' for providing a piezoelectric voltage. A piezoelectric material layer 35a 'that contracts and expands to generate a vertical driving force, and an upper electrode layer 36a' that is stacked on the piezoelectric material layer 35a 'and provides a piezoelectric voltage to the piezoelectric material layer 35a'. Doing.

The micromirror layer 37a is stacked on the lower support 33a at the center of the element 32a to reflect or diffract incident incident light.

On the other hand, an optical device using a GLV device or a piezoelectric diffraction type optical modulator of Samsung Electro-Mechanics as the optical modulator to which the above-described MEMS device is applied includes a light source system, a light collecting unit, an illumination lens system, a plate color wheel, an optical modulator, a Fourier filter system, and a projection system The projection system includes a scanner and a projection lens, and projects incident diffracted light onto the screen.

A display device using such an optical modulator is a device for outputting HDTV-quality video, and 1080 pixels are vertically arranged to scan and display in a horizontal direction.

As shown in Fig. 4A, image data input in a typical HDTV or the like is aligned in the lateral direction. In the display device using the optical modulator, as shown in FIG. 4B, 1080 micro mirror elements are arranged in the longitudinal direction, and display 1080 image data while scanning in the horizontal direction.

In the general-purpose HDTV standard, an image of one frame consists of row length (K) = 1920 pixels and column length (L) = 1080 pixels, and each pixel is typically composed of 3 bytes of 1 byte of each RGB signal.

A display device using an optical modulator used for image scanning of a general-purpose HDTV is an element for outputting an HDTV-class image, and 1080 micro mirror cells are arranged in a row to display and scan in a horizontal direction.

Accordingly, a display device using an optical modulator requires 1080 longitudinally arranged data to scan an image of one frame composed of 1920 X 1080 pixels.

Fig. 5A shows the structure of image data of one frame composed of 1920 X 1080 pixels. The image data shown in Fig. 5A is input from the outside in the transverse direction, that is, in the order of (0,0), (0,1), (0,2), (0,3). Is provided.

However, since the display device using the optical modulator requires 1080 longitudinally arranged data, as shown in Fig. 5B, the input image data must be transposed from the horizontal arrangement to the longitudinal arrangement.

In this way, the scanning direction of the input image signal is 90 degrees, that is, one frame of data must be stored to change the alignment of the data of the column and the row, and the scanning direction of the image data of one frame is changed to convert the input image in real time. While converting and outputting, another input image must be stored in another frame buffer (memory).

HD-TV (1920 * 1080) resolution 8-bit RGB data standard, 2 * 6Mbyte is required to store 2 frames. In addition, in order to perform data conversion of columns and rows, the memory must store data using an external SRAM capable of random access mode.

In order to store 1920 * 1080 60Hz input video RGB signal in 8 bit format in real time, the memory read / write access speed should be operated at about 150MHz or more, but this is close to the limit speed of SRAM. It is difficult, and the possibility of noise generated by high speed operation also increases. It also requires higher density memory than conventional SRAM, which is very expensive.

The present invention to solve the above problems, by using the DDR SDRAM burst mode, by converting the input data arrangement sequentially input in the transverse direction to the input data in the longitudinal direction improved in terms of cost, access speed and storage capacity It is an object of the present invention to provide a data transpose apparatus and a method thereof.

The present invention for achieving the above object is a line double buffer unit for temporarily storing a predetermined line of the input data of the RGB video signal arranged in the longitudinal direction when the RGB video signal arranged in the longitudinal direction from the outside; A scan converter configured to temporarily read the input data of the RGB video signal stored in the line double buffer unit in a horizontal direction and temporarily store the transposed video signal in units of frames; A DDR SDRAM unit for storing input data of the transposed RGB video signal in units of frames; A read line buffer unit sequentially reading the transposed RGB video signal stored in the DDR SDRAM unit in a time-divided manner according to a predetermined signal order to temporarily store a predetermined line and then output the temporary line; An output buffer unit reading a video signal from the lead line buffer unit in a longitudinal direction and temporarily storing a predetermined line and outputting the line to an optical modulator driver; And read the transposed video signal from the scan converter unit in a frame unit and store the video signal transposed in the DDR SDRAM unit, and sequentially read the transposed video signal stored in the DDR SDRAM in a time division manner according to a predetermined signal sequence. And a DDR SDRAM controller for outputting to the buffer unit.

In addition, the present invention is a first step of temporarily storing a predetermined line of the input data of the RGB video signal arranged in the longitudinal direction of the line double buffer unit when the RGB video signals arranged in the longitudinal direction from the outside; A second step of temporarily reading the input data of the RGB video signal stored in the line double buffer unit in a transverse direction and temporarily storing the transposed video signal in units of frames; A third step in which the DDR SDRAM controller reads the video signal transposed by the scan converter unit in units of frames and stores the video signal in the DDR SDRAM unit; A fourth step in which the DDR SDRAM controller sequentially reads the transposed video signal stored in the DDR SDRAM in a time-divided manner according to a predetermined signal order and temporarily stores the read video buffer in a read line buffer unit; And a fifth step of outputting the video signal temporarily stored in the read line buffer unit in the longitudinal direction, temporarily storing the predetermined line, and outputting the predetermined line to the optical modulator driver.

Now, the preferred embodiment of the present invention will be described in detail with reference to the drawings of FIG. 6.

Fig. 6 shows an embodiment of the one-panel optical apparatus using the optical modulator to which the present invention is applied. In this example, a case of application to a laser display will be described.

The laser display according to the present embodiment is used, for example, as a projector for large screens, particularly as a projector for digital images or as a computer image projection apparatus.

Referring to the drawings, a one-panel optical device using an optical modulator to which the present invention is applied includes a light source system 61, a condenser 62, an illumination lens system 64, a plate-shaped color wheel 67, and an optical modulator 68. ), A Fourier filter system 69, a projection system 72, and a screen 75.

The light source system 60 includes a plurality of light sources 61a to 61c, and the light collecting unit 62 includes one mirror 63a and a plurality of color-dividing mirrors 63b and 63c.

The plurality of light sources 61a to 61c include, for example, a red light source 61a, a green light source 61b, and a blue light source 61c. The light condenser 62 collects blue light, green light, and red light by one reflection mirror 63a and a plurality of dichroic mirrors 63b and 63c to form a multi-beam to form a single illumination system.

Next, the illumination lens system 64 converts the condensed multiple beams into linear parallel light and enters the light modulator 68 through the plate-shaped color wheel 67. Here, the plate-shaped color wheel 67 is a color filter that transmits only a light beam having a wavelength corresponding to each color of the multiple beams, a coupler (Coupler) to which the color filter is attached, and is attached to the coupler to generate rotational force. The motor and the like to sequentially rotate the coupler and the color filter attached to the plate shape corresponding to the rotational speed of the motor to separate the color of the light beam sequentially.

The optical modulator 68 forms a diffracted light by performing light modulation on the linear parallel light of the wavelength during the incident time when the linear parallel light having a single wavelength is incident from the plate-shaped color wheel 67 to form diffracted light, and the Fourier filter Incident to the system 69 is made.

The Fourier filter system 69 is preferably composed of a Fourier lens 70 and a dichroic filter 71, which separates the diffracted light by orders and transmits only the diffracted light of the desired order.

On the other hand, the projection system 72 is provided with the scanner 73 and the projection lens 74, and projects the incident diffracted light on the screen 75.

7 is a block diagram of a control block in the optical device using the optical modulator of FIG. 6, in which a reference table is stored to correct characteristics of the driver 72 and the optical modulator 71 for driving the optical modulator 71. FIG. The flash memory 73, the DDR SDRAM 74 for storing the transposed input data in units of frames, and converting the arrangement of the rows and columns of image data and storing them in the DDR SDRAM 74 in units of frames, and then sequentially. It consists of a controller 76 that functions to read and transfer image data to the driver 71 and to control the galvanometer mirror scanner 75.

Here, the controller 76 receives RGB image data from the outside and transposes the input image data frame by frame to store in the DDR SDRAM 74.

The controller 76 sequentially reads the transposed image data stored in the DDR SDRAM 74 and transmits the image data to the driver 72.

The driver 72 then controls the optical modulator 71 according to the transposed image data input from the controller 76 to display the image data on the screen.

8 is a block diagram of a data transposing apparatus according to an embodiment of the present invention, a pair of lines provided for each RGB signal to temporarily store input data in units of 2 lines, 4 lines, or 8 lines A pair of scan converters (82RA to 82BB) provided for each RGB signal for longitudinally scanning and storing input data stored in the double buffers 81RA to 81BB and the line double buffers 81RA to 81BB, and the transposed image. DDR SDRAM controllers for controlling the paired DDR SDRAMs 84A and 84B for storing data in frame units and the respective DDR SDRAMs 84A and 84B for storing the transposed data in the DDR SDRAMs 84A and 84B. 83A, 83B), a pair of read double buffers 85A, 85B for reading and temporarily storing image data from DDR SDRAMs 84A, 84B, and a pair of output buffers 86A, 86B provided for temporarily storing output data. To provide a clock signal The controller 87 is provided.

First, image data is input to each of the first line double buffers 81RA, 81GA, and 81BA in units of 2 bytes for each RGB signal. Here, the line double buffers 81RA, 81GA, and 81BA may be used in units of 2 lines, 4 lines, and 8 lines. For convenience of description, the line double buffers of 4 lines will be described as an example.

The line double buffers 81RA, 81GA, and 81BA corresponding to the respective RGB signals alternately store input data with the line double buffers of paired reference numerals 81RB, 81GB, and 81BB.

That is, when the first line double buffer 81RA, 81GA, 81BA stores four lines of input data, the second line double buffer 81RB, 81GB, 81BB stores the next four lines of input data, and again the first line double buffer ( 81RA, 81GA, 81BA) then stores four lines of input data and repeats this operation.

Herein, the data structure stored in the four-line double buffer (81RA, 81GA, 81BA or 81RB, 81GB, 81BB) is shown in FIG. 9A, and in one line, (0.0) (0.1) (0.2) (0.3) ... (0.1916) (0.1917) (0.1918) (0.1919) and (1.0) (1.1) (1.2) (1.3) ... (1.1916) (1.1917) (1.1918) (1.1919) Line 3 stores (2.0) (2.1) (2.2) (2.3) ... (2.1916) (2.1917) (2.1918) (2.1919), and on line 4 (3.0) (3.1) (3.2) ( 3.3) ... (3.1916) (3.1917) (3.1918) (3.1919) are stored. Therefore, the total number of pixels stored in the four-line double buffer 81RA, 81GA, 81BA or 81RB, 81GB, 81BB is 7680 (1920 * 4).

Each of the pair of scan converters 82RA to 82RBB stores input data input from the outside in frame units, and stores the transposed input data. That is, the first scan converters 82RA, 82GA, and 82BA first read and store input data in the longitudinal direction from the first line double buffers 81RA, 81GA, and 81BA to perform transpose on the input data. In this case, in the 4-burst mode, the longitudinal 4-byte data stored in the first line double buffers 81RA, 81GA, and 81BA are sequentially read and stored, and each of the scan converters 82RA, 82GA, and 82BA is stored. The data read once is 32-bit data, and all the data can be read from the first line double buffer (81RA, 81GA, 81BA) through 1920 read operations.

Subsequently, the first scan converters 82RA, 82GA, and 82BA read and store the input data in the longitudinal direction from the second line double buffers 81RB, 81GB, and 81BB to perform transpose on the input data.

Subsequently, the first scan converters 82RA, 82GA, and 82BA read the input data in the longitudinal direction from the first line double buffers 81RA, 81GA, and 81BA, and then store the second line double buffer (81RB, 81GB, 81BB). Reads the input data in the longitudinal direction and stores it, and repeats this operation until all the transposed input data is stored frame by frame.

This operation is then repeated until the second scan converter (82RB, 82GB, 82BB) has saved all the transposed input data for the input data of the next frame, after which the first scan converter (82RA, The pair of scan converters 82RA to 82BB alternately perform these operations until the 82GA and 82BA again store all input data of one frame.

At this time, an example of the data structure of the scan converter 82RA, 82GA, 82BA or 82RB, 82GB, 82BB is shown in FIG. 9B, where data of (0.0) (1.0) (2.0) (3.0) is stored in one line. In this case, (0.1) (1.1) (2.1) (3.1) are stored in two lines, and data are sequentially stored up to 1920 lines in this manner.

An example of the data structure in units of frames stored in the scan converter (82RA, 82GA, 82BA or 82RB, 82GB, 82BB) is shown in FIG. 9C, which is composed of a total of 270 blocks.

The first block of the scan converter 82RA, 82GA, 82BA or 82RB, 82GB, 82BB is the first line double buffer (81RA, 81GA, 81BA) of the corresponding signal-specific line double buffers 81RA, 81RB, 81GA, 81GB, 81BA, 81BB. ), And the second block stores the input data input from the second line double buffer (81RB, 81GB, 81BB), and the third block again inputs from the first line double buffer (81RA, 81GA, 81BA). The input data is stored, and the operation is repeated until all the input data of one frame is stored.

On the other hand, a pair of DDR SDRAM controllers 83A or 83B responds by reading data in rows with respect to input data of one frame stored in the corresponding scan converters 82RA, 82GA, 82BA or 82RB, 82GB, 82BB. In the DDR SDRAM 84A or 84B, the transposed input data is stored in units of frames.

At this time, the DDR SDRAM controller 83A or 83B reads all the signal-specific scan converters 82RA, 82GA, 82BA, or 82RB, 82GB, 82BB in 32-bit units, respectively, so that a total of 96 bits of data are read at once. It can be stored in DDR SDRAM (84A, 84B) or read sequentially and stored. Of course, the DDR SDRAM 84A, 84B may be provided in pairs for each signal, and accordingly, the DDR SDRAM controllers 83A, 83B may be provided in pairs for each signal to control the DDR SDRAM.

Here, DDR SDRAM (84A, 84B) is a memory that has already been widely used for high-end graphics card, etc., and doubles the speed of conventional SDRAM by allowing the output to come from both rising and falling system clocks. to be. It is similar to RDRAM, but based on the existing SDRAM, it has the advantage of excellent compatibility and lower manufacturing costs.

In addition, the DDR SDRAMs 84A and 84B store transposed input data for all RGB signals. The data structure is shown in FIG. 9E, and the upper section shows a data structure in which the R signal is transposed. The interval shows the data structure in which the G signal is transposed, and the lower interval shows the data structure in which the B signal is transposed.

The DDR SDRAM controller 83A or 83B alternately reads 48 bits of data from the corresponding DDR SDRAM 84A or 84B, and alternately stores them in each of the pair of read double buffers 85A or 85B. The read double buffer 85A or 85B may be configured in units of 2 lines, units of 4 lines, and units of 8 lines. The read double buffers 85A or 85B may be paired to alternately store input data. At this time, since the DDR SDRAM controller 83A or 83B is a one-panel optical device, the R signal is read out for every one frame and sequentially stored in the read double buffers 85A and 85B, and then one frame for the G signal. All of them are read out and sequentially stored in the read double buffers 85A and 85B. Next, all of the frames for the B signal are read out and sequentially stored in the read double buffers 85A and 85B. Of course, after that, the DDR controller 83A or 83B repeats the same process for the next frame.

On the other hand, the pair of output buffers 86A, 86B read the transposed input data from the pair of read double buffers 85A or 85B, alternately temporarily store them, and output them.

In this case, the pair of output buffers 86A and 86B output data in units of 48 bits to be configured in the same manner as the external input data 48 bits, but the transposed input data can be configured to be output faster than this. Input data can prevent congestion.

The clocks of the line double buffer, the scan converter, the DDR SDRAM controller, the read double buffer, and the output buffer described above are provided by the time controller 87 to be synchronized.

10 is a flowchart of a data transposing method of an optical device using an optical modulator according to an embodiment of the present invention.

Referring to the drawings, in the data transposing method of an optical apparatus using an optical modulator according to an embodiment of the present invention, when an RGB video signal is input from the outside, a pair of line double buffers provided for each signal are alternately inputted. The data is stored, but is stored in units of 2 lines, 4 lines, or 8 lines (step S110).

Next, the pair of scan converters read the input data of the RGB video signal stored in the line double buffer laterally and store them alternately in units of frames (step S112).

Thereafter, a pair of DDR SDRAM controllers read the data-transposed input data line by line from the scan converter and store them frame-by-frame in the corresponding DDR SDRAM (step S114). Temporarily store (step S116).

Next, the pair of output buffers alternately read data in the longitudinal direction from the read double buffer and temporarily store the data, and then output it to the optical modulator driver (step S118).

According to the present invention as described above, by configuring the buffer and control logic suitable for the burst mode of the DDR SDRAM using the DDR SDRAM to convert the scan direction by 90 degrees, the cost and access speed is also greatly improved in terms of storage capacity There is.

Although the present invention has been described above by way of examples, the scope of the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the present invention. It is intended that the scope of the invention only be limited by the following claims.

Claims (7)

Based on the image displayed on the screen from the outside, when the RGB video signals in the vertical array, which are columns of the image data displayed in the vertical direction on the screen, are input, the input data of the RGB video signals arranged in the vertical direction is input in a predetermined line unit. A line double buffer section for reading and storing temporarily; When the input data of the RGB video signal stored in the line double buffer unit is based on the image displayed on the screen, the image data of the horizontal arrangement, which is a column of the image data displayed horizontally on the screen, is read and transposed in this way. A scan converter which temporarily stores the video signal in units of frames; A DDR SDRAM unit for storing input data of the transposed RGB video signal in units of frames; A read line buffer unit reading the transposed RGB video signal stored in the DDR SDRAM unit at different times according to a predetermined signal order to temporarily store a predetermined line and then output the temporary line; An output buffer unit reading a video signal from the lead line buffer unit in a longitudinal direction and temporarily storing a predetermined line and outputting the line to an optical modulator driver; And The transcoded video signal read from the scan converter unit in frame units is stored in the DDR SDRAM unit, and the transposed video signal stored in the DDR SDRAM is read at different times according to a predetermined signal sequence to the lead line buffer unit. Data transpose device including a DDR SDRAM controller to output. The method of claim 1, And the line double buffer unit is configured in 2 line units, 4 line units, 8 line units, and the like. The method of claim 1, And the line double buffer unit is a pair of line double buffers separated for each signal. The method of claim 1, And the scan converter unit is a pair of line double buffer units separated for each signal. The method of claim 1, And the DDR SDRAM unit comprises a plurality of DDR SDRAMs separated by signals. When the RGB video signal arranged in the vertical direction, which is a column of the image data displayed in the vertical direction on the screen, is input based on the image displayed on the screen from the outside, the input data of the RGB video signal in which the line double buffer part is arranged in the vertical direction A first step of temporarily reading the data in a predetermined line unit; When the input data of the RGB video signal stored in the line double buffer unit is based on the image displayed on the screen, the transcoded video signal is temporarily stored in the horizontal unit on the screen. Second step;  A third step in which the DDR SDRAM controller reads the video signal transposed by the scan converter unit in units of frames and stores the video signal in the DDR SDRAM unit; A fourth step of the DDR SDRAM controller temporarily reading the transposed video signal stored in the DDR SDRAM at different times according to a predetermined signal sequence and temporarily storing the transposed video signal in a read line buffer unit; And And a fifth step of outputting a video signal temporarily stored in the read line buffer unit in a longitudinal direction, and temporarily storing a predetermined line after outputting the video signal to an optical modulator driver. delete

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