KR20020041199A - Apparatus and method for rotating on-screen display fonts - Google Patents

Abstract

PURPOSE: A device and a method for rotating an OSD(On Screen Display) font are provided to maintain an OSD message and a video screen to a position making a user watch it easily and to largely reduce a cost of a font ROM by using a font-base as an interpreting device. CONSTITUTION: A CPU(306) controls the rotation of the OSD fonts by receiving an OSD display command and generating a control signal. A font address generator(308) receives a reference signal from a synchronization signal generator(304) and the control signal in order to generate the OSD font addresses. A storing device(310) stores the OSD font address. The font ROM(312) keeps the OSD font matching with the OSD font address. An interpreter(314) rotates the OSD font in an order in order to form the rotated fonts by rotating the OSD font. An output device includes a storing media, an output circuit(320) and an output controller(318), and receives the rotated font. A display device(322) displays the OSD message in order to from the screen synchronized with the video screen and the OSD message on the display.

Description

On-screen display font rotation device and method {APPARATUS AND METHOD FOR ROTATING ON-SCREEN DISPLAY FONTS}

The present invention relates to an apparatus and method for rotating fonts, and more particularly, to an apparatus and method for rotating an on-screen display (OSD) font.

With the rapid popularity of computer peripherals in recent years, many display devices such as cathode ray tube (CRT) screens and liquid crystal displays (LCDs) have played an increasingly important role in this field. . The implementation of such a display device is fundamentally dependent on the calibration of the parameters in addition to the manufacturer's optimum parameters such as contrast, brightness, vertical and horizontal size, and geometric shape. The OSD provides interactive information to the user to get the best picture quality through the above parameters. There is a select button for OSD message display mode. The OSD device receives the command signal and, when the user presses a select button to generate the command signal, sends the command signal to a central processing unit (CPU) to accurately control contrast, brightness, vertical and horizontal size. send. Furthermore, the user can clearly observe the effects of the adjustment of the parameters. In addition, the video screen is superimposed on the OSD message.

However, when the display device rotates, the conventional OSD message is not suitable for the video screen, so that the OSD message is asynchronous with the video screen, so that the OSD message is set at an improper position where the user is inconvenient to see the parameters in the OSD message. In addition, this leads to a large deviation and an uncomfortable state in the adjustment of the parameters. Currently, most display devices operating in a line-scan manner forming a complete video screen are continuously scanned line by line in accordance with the vertical or horizontal signal of the display device. Therefore, the font of the OSD message should be sequentially output to the display device. When rotating the display device, because the vertical or horizontal signal associated with the OSD device still remains unchanged, the OSD message and display device become asynchronous so that the OSD message does not match the video screen and consequently is not suitable for user viewing. Will be placed in position. 1A illustrates a relationship between an OSD message and a video screen after the display device is rotated.

As a result, as the display device rotates, conventional OSD messages cannot be synchronized with the video screen. This case causes a very large inconvenience, and many errors occur when adjusting the parameters of the display device. In addition, since the font of the conventional OSD message is realized in a bitmap method, the processing of the OSD font is inefficient. This not only consumes large memory capacity but also significantly increases the computation time as the OSD font is rotated.

In view of the above, conventional OSD devices face the problem that OSD messages become asynchronous with the video picture.

As a result, the technical problem to be achieved by the present invention is to present an OSD font rotation apparatus and method to maintain the OSD message and video screen in a location that the user can easily watch.

Another technical problem to be solved by the present invention is to provide an apparatus and method for significantly reducing the cost of a read only memory (ROM) by using a font-based as a reading device.

According to the technical problem to be solved above, the present invention provides an OSD font rotation apparatus and method. The OSD font rotation device consists of an OSD rotation device including a CPU, a font address generator, a storage device, a font ROM, a decoder, a shift register, an output controller and an output circuit, a synchronization signal generator, and a display device.

With such a device, an OSD display command is input to the CPU to instruct the CPU to start reading a plurality of OSD font addresses, and a plurality of OSD fonts corresponding to the OSD font addresses are created and stored in the storage device. Next, the OSD font corresponding to the font address initially stored in the font ROM is read and passed to the decoder. The decryptor also executes the decryption process such that the OSD font is in a number of rotated fonts. The rotated font is stored in the storage medium and sequentially output to the external circuit. The OSD message including the rotated font is displayed on the display device so that the video screen is synchronized with the OSD message.

In the present invention, an apparatus and method for rotating OCD fonts are described to maintain desirable viewing between OSD messages and video screens. In addition, since the OSD font is read in the basic font method according to the present invention, the time taken for the OSD font rotation operation is faster than that of the conventional OSD rotation font which is a bitmap method. In addition, the overlapping OSD fonts are significantly reduced by using various OSD font rotation angles.

The above described features and many accompanying advantages of the present invention will be better understood and gradually better understood by reference to the following detailed description taken in conjunction with the accompanying drawings.

1A illustrates a relationship between a conventional OSD message and a video screen after the display device is rotated.

1B illustrates a relationship between an OSD message and a video screen after the display device is rotated according to the present invention.

2a to 2e show the basic principle of rotating the OSD font in accordance with the present invention,

3 is a system block diagram showing the rotation of the OSD font according to the present invention,

4 is a diagram of a decoder according to the invention,

5 is a flowchart illustrating the rotation of the OSD font in accordance with the present invention.

The present invention proposes an OSD font rotation apparatus and method which alleviates the disadvantages noted above.

1B illustrates a relationship between an OSD message and a video screen after the display device is rotated. The present invention provides an apparatus and method for forming a rotated OSD font to generate an OSD message so that the OSD message matches the video screen that is the display device.

2A-2E illustrate the basic principle of OSD font rotation. In a preferred embodiment of the present invention, for example, the letter "P" is read sequentially in the horizontal direction 201 before the OSD font is rotated. However, after the OSD font is rotated, it must be read to decode the OSD font through the reader by reading characters in the vertical direction 203 to output the rotated OSD font. In particular, when the OSD font is output as characters having various patterns as shown in FIGS. 2B to 2E, the OSD message may always be kept consistent with the video screen of the display device. You can also replace letters with patterns, letters, numbers, and special characters.

2A shows a dot matrix of the OSD font. In a preferred embodiment of the present invention, the OSD font is stored in the form of dot matrix 200 in the storage device. In other words, the OSD font contains a number of dots stored in the font ROM line by line, and the main characteristic of OSD font reading is indicated by the OSD font, but not by "dot font" (not indicated by individual dots 202 of the OSD font at a time). font-base) ".

The OSD font preferably consists of a matrix of m x n dots with m = 12 and n = 18 (m, n are positive integers), so all the dots of the OSD font are all 216. In addition, the bit value of the black dot is defined as "1", the bit value of the white dot is set to "0", the left side of the dot matrix is set to the most significant bit (MSB) 204, and the dot matrix is set. The right side of is denoted as the LSB (least significant bit) 206.

2B shows a first OST font stored as a basic font in the font ROM. The OSD rotation element reads 18 bits of each column 210 at a time, from the left MSB to the right LSB, and the OSD font is read 12 times sequentially to form all of the OSD fonts. Taking the letter "P" as an example, if it is necessary for the sixth line 212 of the character to be represented, the character reads 18 bits of one column 210 at a time until the character is read completely, but each column 210 Only the sixth bit of) is selected. Since the character is read twelve times in turn, the sixth row 212 has each bit value formed entirely from " 001100001100 "

2C shows a second OSD font stored as a basic font in the font ROM. The OSD rotating device reads 18 bits of each column 216 at a time from the upper left LSB to the lower right MSB at a time, and the OSD font reads 12 times sequentially to form all of the OSD fonts. Taking the letter "P" as an example, if it is necessary to represent the sixth line 220 of a character, the character reads 18 bits of one line 220 at a time until the character is completely read. As the sixth row 220 is read out, the sixth row 220 data is completely formed, with each of these bit values being " 001100001100000000 " from left to right in FIG. 2C.

2D shows a third OSD font stored as a basic font in the font ROM. The OSD rotating element reads 18 bits of each row 222 at a time from the upper left MSB to the lower right LSB, and the OSD font is read 12 times sequentially to form all of the OSD fonts. Taking the letter "P" as an example, if it is necessary to represent the sixth line 224 of a character, the character reads 18 bits of one line 224 at a time until all of the characters are read. As the sixth row 224 is read out, the sixth row 224 data is completely formed, with each bit value " 001100001100000000 " from left to right in FIG. 2D.

2E shows a fourth OSD font stored as a basic font in the font ROM. The OSD rotating device reads 18 bits of each column 228 at a time from the left MSB to the right LSB, and the OSD font is read 12 times sequentially to form all of the OSD fonts. Taking the letter "P" as an example, if it is necessary for the sixth row 230 of characters to appear, the character reads 18 bits of one column 228 at a time until the character is read completely, but each column 228 Only the sixth bit of) is selected. As the character is read twelve times in turn, a sixth row 230 is formed in which each of these bit values is "000000001100" from the MSB to the LSB.

3 shows a system block diagram 300 illustrating the rotation of the OSD font. The system block diagram 300 includes a CPU 306, a font address generator 308, a memory device 310, a font ROM 312, a decoder 314, a shift register 316, an output controller 318, and an output circuit. And a OSD rotation device 302 including a synchronization signal generator 304 and a display device 322.

The synchronization signal generator 304 is a scan frequency generator of the display device 322, and is used as a reference signal for OSD font rotation during scanning so that the OSD message including the OSD rotation font coincides with the display direction of the video screen. CPU 306 such as micro control unit (MCU) and digital signal processor (DSP) play an important role in OSD font rotation. The CPU 306 uses various buses 324, 326, such as control buses, address buses, and data buses, to send signals and OSD fonts to various devices in the processing OSD rotation element.

The font address generator 308 is an address generator for OSD fonts, controlled by the CPU 306 to form a desired OSD font, and uses the synchronization generator 304 as a reference signal source. Storage device 310, such as static access memory (SRAM), is a storage medium used to store the font address of the desired OSD font. Font ROM 312 is also a storage medium used to store the OSD font of the OSD message. The shift register 316, which is a storage medium, converts an OSD font from a parallel data format to a serial data format, stores the OSD font in a storage device, and sequentially transmits the OSD font to the output circuit 320. The output controller 318 is an output control device that controls the output priority of the output circuit 320 with respect to the OSD font in accordance with a control signal from the CPU 306.

In addition to receiving color attributes of OST fonts such as red, blue, and green, the output circuit 320, which is an output device, converts the data to transmit the rotated font to the display device 322. In other words, the digital signal of the OSD font is converted into an analog signal, mixed with the attributes of the OSD font, and transmitted to different standard interface cards of the various display devices 322. In addition, the display device 322 includes a CRT screen, a home TV, and an LCD.

4 is a diagram of the decoder 400. In a preferred embodiment of the invention, the decoder 400 comprises a plurality of decryption elements 400 ₁ ,..., 400 _m , a scan controller 404 and an output selector 406. B ₁ 400 ₁ ,. Each of these decryption elements, denoted by B _m 400 _m, etc., preferably comprises four channels 412 for receiving control signals from the control bus 324 of the CPU 306 and sending these signals 0 °, 90 °. It is used to control the rotation angle of the OSD font corresponding to the four angles of the display device which is clockwise, 90 ° counterclockwise, 180 ° clockwise or counterclockwise. The decoder also includes z lines of data channel 416, where z is the number of OSD fonts for continuously receiving OSD fonts, such as OSD fonts, such as font ROM 312, from data bus 326. The decoder preferably comprises four output channels 414, each connected to a decoder element 400 ₁ ,..., 400 _m, etc. And, n lines of channel 410 are connected to scan controller 404 to control the output of the rotated OSD font after decoding.

Scan controller 404 coupled to the decryption element and a synchronization generator (not shown) provides channels L ₁ , L ₂ ,..., Receiving signals from synchronization signal generator 304. Since n lines 410, denoted by L _n-1 , L _n , the scanning sequence of the decoder is fully controlled by the scanning controller. In other words, the scanning controller can optionally control the dot output of the OSD font with reference to a horizontal or vertical synchronization signal. Scan selection also includes various coordinate axes, for example the horizontal axis (X axis) and the vertical axis (Y axis) of the font dot matrix.

An output selector 406 connected to the decryption element and the CPU is connected to the data bus to receive the output of the decryption element, so that D ₁ , D ₂ ,. The output priority of the rotated OSD font is precisely controlled because it includes n selection lines 408 denoted by D _n-1 and D _n . D ₁ is LSB and D _n is MSB, respectively.

In a preferred embodiment of the present invention, when the decoder reads the character "P" of 12 x 18 dots upon decryption, the display device 322 is in the 0 ° position according to the basic principle shown in Fig. 2B. For example, if the 0 ° position, which is the sixth row 212, is recognized by the CPU 306, all sixteen columns of the OSD font are read at the same time by the decryption element, so that the sixth row 212 is replaced by the scan controller 404. The operation can be decrypted and can optionally be output to the shift register 316. That is, L ₆ may allow B ₁ to selectively transmit dots ₁ , ₆ to the same operating line D ₁ , and L ₆ may selectively cause B ₁₂ to form a sixth row 212. Dots 12 and 6 can be sent to D ₁₂ . In the same way as above, other lines of the letter "P" are formed. As a result, the letter "P" is displayed from the first to the eighteenth lines.

Similarly, for example, the left and right sides of the letter “P” dot matrix are interchanged and the normal top and bottom sides of FIG. 2B are fixed to define this as the first mirror image position. Therefore, MSB and LSB of the dot matrix are turned to each other, D ₁₂ is converted to a D ₁ of the MSB, D ₁ is converted to a D ₁₂ in LSB. The OSD font reading method is unchanged, and the OSD font is continuously scanned from L ₁ to L ₁₈ according to the first OSD font.

In addition, the left and right sides of the dot matrix are usually fixed and the upper and lower sides of FIG. 2B are changed, which is defined as a second mirror image position. The MSB and LSB of the dot matrix are unchanged and the reading method of the OSD font is interchanged so that the OSD font is continuously scanned from L ₁₈ to L ₁ according to the first OSD font.

The left and right sides of the dot matrix are swapped with each other, and the top and bottom sides of FIG. 2B are changed, which is defined as a third mirror image position. And the dot matrix MSB and LSB is exchanged each other, where D ₁₂ is changed to the MSB of the D _1, D ₁ is changed to D ₁₂ in LSB. And the reading method of the OSD font is changed, where the OSD font is scanned from L ₁₈ to L ₁ according to the first OSD font.

Thus, each OSD font includes four positions in two dimensions, and each position includes four rotation angles to form 16 (4x4) types of rotating OST fonts. This reduces dual OSD fonts and is formed by rotating some OSD fonts such as "b", "d", "p", and "q" to reduce the cost of storage for storing the OSD fonts.

In a preferred embodiment of the present invention, when the decoder reads the character "P" of 12 x 18 dots upon decryption, the display device is in a 90 ° clockwise position according to the basic principle shown in Fig. 2C. For example, if the 90 ° clockwise position, which is the sixth row 220, is recognized by the CPU 306, all twelve columns of the OSD font are read simultaneously by the decryption element so that the sixth row 220 may be read by the scan controller. It can be decrypted through the operation and optionally output to the shift register 316. That is, L ₆ may allow B ₆ to select the sixth row of dots to form the sixth row 220 and transmit these dots sequentially from D ₁ to D ₁₈ . In the same way, the other rows of the dot matrix are formed in the above way. As a result, the letter "P" appears from the first line 216 to the twelfth line. Similarly, the left and right sides of the dot matrix are interchanged in FIG. 2C and are defined as mirror image positions. L ₆ allows B ₆ to select the dots in sixth row 220 to form sixth row 220 and thereby sequentially transmit these dots from D ₁₈ to D ₁ .

In a preferred embodiment of the present invention, when the decoder reads the letter "P" which is 12 x 18 dots in decryption, the display device is in a 90 ° counterclockwise position according to the basic principle shown in Figure 2d. For example, if the 90 ° counterclockwise position, which is the sixth row 224, is recognized by the CPU 306, all twelve columns of the OSD font are read simultaneously by the decryption element, so the sixth row 224 is the scan controller. It can be controlled through the operation of, can be selectively output to the shift register 316. In other words, L ₆ may cause B ₆ to select the sixth row 224 dots to form sixth row 224 and to transmit these dots from D ₁₈ to D ₁ . In the same way, the other rows of the dot matrix are formed as above. Finally, the letter "P" appears from the first line 222 to the twelfth line. Similarly, the left and right sides of the dot matrix are interchanged in FIG. 2D, defined as the mirror image position. L ₆ allows B ₆ to select the sixth row 224 dots to form a sixth row 224 to sequentially transmit these dots from D ₁ to D ₁₈ .

In a preferred embodiment of the present invention, when the decoder reads the character "P" which is 12 x 18 dots when decrypted, the display device 322 is rotated 180 degrees clockwise or counterclockwise according to the basic principle shown in FIG. 2E. Is in. For example, if the clockwise or counterclockwise 180 ° position, which is the sixth row 230, is recognized by the CPU 306, all twelve rows of the OSD font are read simultaneously by the decryption element, so that the sixth row 230 May be decoded through an operation of the scan controller and selectively output to the shift register 316. In other words, L ₆ allows B ₁₂ to selectively transmit dots 1 and 6 to the same D ₁₂ as the rest of the operating line, and L ₆ allows B ₁ to form a sixth row 230. Allows you to selectively send (12, 6) to D ₁ . Another column of letters "P" is formed in the same manner as above. As a result, the letter "P" appears from line 1 to line 18. Similarly, the left and right sides of the dot matrix are interchanged with each other in FIG. 2E defined as the mirror image position. L ₆ causes B ₁₂ to selectively transmit dots 1 and 6 to the same D ₁ with the remaining operating lines, and L ₆ optionally allows dots ₁ to form a sixth row 230. , 6) to D ₁₂ .

5 is a flowchart 500 illustrating rotation of the OSD font. In the start step 502, an OSD display command is input to a CPU 306, such as an MCU or DSP, so that a control signal formed by the CPU 306 is sent to the device of the OST rotating device to start executing the OSD font reading process.

In step 504 of reading the OSD font, the font address generator 308 creates a font address corresponding to the desired OSD font according to the signal of the CPU 306. The OSD rotation device uses the signal formed by the synchronization generator 304 as a reference signal, where the synchronization signal can coincide with the start time of the OSD screen to leave a rotating OSD font synchronized with the video screen. The OSD font address is then stored in a storage device such as SRAM. The preferred OSD font selected in the OSD font ROM is determined by the font address.

In step 506 of determining the rotation position, after the CPU 306 receives the OSD font rotation command, it is determined whether the display device 322 is to be rotated. If the display device 322 does not rotate, step 518 is performed in which the OSD font can be directly input to the display device because the video screen is at the 0 ° position. When the display device 322 is rotated, the step 506 is displayed in the OSD font because the video screen can be positioned in various positions, for example 90 ° clockwise, 90 ° counterclockwise, 180 ° clockwise or counterclockwise. Proceed to step 510, which can be decoded.

When the video screen is in the 90 ° clockwise position, the principle is shown in Fig. 2C. For example, in the sixth row 220, all twelve rows of the OSD font are read sequentially in the decryption element from the first to the twelfth row. Sixth row 220 is scanned to perform a decryption process via a scan controller and is output to shift register 316 by an output selector.

When the video screen is in the 90 ° counterclockwise position, the principle is shown in FIG. 2D. For example, in the case of the sixth row, all twelve rows of the OSD font are read sequentially by the decryption element from the first to the twelfth rows. Sixth row 224 is scanned through a scan controller to process the decryption process and output to shift register 316 by an output selector.

When the video screen is in a 180 ° clockwise or counterclockwise position, the principle is shown in FIG. 2E. For example, in the case of the sixth row 230, all twelve columns of the OSD font are read sequentially by the decryption elements from the first column to the twelfth column. Sixth row 230 is scanned through scan controller 404 to execute the decryption process and output to shift register 316 by an output selector.

In step 512 of storing the rotated OSD font, the rotated OSD font decrypted by the decoder is briefly stored in the shift register 316 to be converted into serial data form and subsequently ejected to the output circuit 320.

In step 516 of outputting the OSD font, the output circuit 320, which is an output device, transmits the rotated font to the display device 322, in addition to receiving attributes of the OST font color such as red, blue, green and background colors. Use data transformation. In other words, the digital signal of the OSD font is converted into an analog signal, mixed with the attributes of the font, and transmitted to different standard interface cards of various display devices.

In the output control step 514, the output controller 318 is a device for controlling the output priority for the OSD font in accordance with the control signal of the CPU 306.

In step 518 of displaying the OSD message, the display device 322, such as a CRT screen, TV, LCD, receives OSD fonts and other related attributes from the output circuitry and displays them on the display device.

In summary, an OSD font rotation apparatus and method are described herein in the preferred direction between an OSD message and a video screen. Moreover, according to the present invention, the OSD font rotation operation time is much shorter than that of the conventional OSD rotation font of the bitmap method because the OSD font is read in the basic font method. In addition, overlapping OSD fonts can be significantly reduced by using various rotation angles of the OSD fonts.

As will be appreciated by those skilled in the art, the foregoing embodiments of the invention illustrate the invention rather than limit the invention. It is intended to cover various modifications and similar arrangements within the spirit and scope of the appended claims, and the scope of the invention should be construed broadly to encompass all such modifications and similar schemes.

Claims (26)

In the device for rotating the OSD (on-screen display) fonts, A CPU controlling a plurality of OSD font rotations by receiving an OSD display command and generating a control signal; A font address generator coupled to the CPU and a synchronization signal generator, respectively, for receiving a reference signal and the control signal from the synchronization signal generator to form a plurality of OSD font addresses; A memory device connected to the CPU and the font address generator, respectively, to store the OSD font address; A font ROM coupled to the CPU and the storage device, the font ROM having the OSD font corresponding to the OSD font address; A decoder connected to the CPU and the font ROM, respectively, to sequentially rotate the OSD font to rotate the OSD font to form a plurality of rotated fonts; A storage medium connected to the decoder and the CPU to convert a data format of the rotated font, an output circuit connected to the storage medium to form an OSD message, and connected to the output circuit and the CPU, respectively, to control a display sequence An output device for receiving the rotated font; And A display device coupled to the output circuit for displaying the OSD message to form a synchronized screen between the video screen and the OSD message on the display device; OSD font rotating device comprising a. In claim 1, A plurality of decryption elements for receiving the control signal to execute a decryption process; A scanning controller coupled to the decryption element and the synchronization generator, respectively, to control a scan sequence during the decryption process; And An output selector coupled to the decryption element and the CPU to select the output priority of the rotated font OSD font rotating device comprising a. In claim 2, And the decryption element comprises a plurality of channels. In claim 2, And the scanning controller includes a plurality of channels. In claim 2, And the output selector comprises a plurality of channels. In claim 2, And the scan controller includes one scan selection selected from the group consisting of X and Y axes. In claim 2, And the output selector comprises the respective fonts outputted from MSB to LSB. In claim 2, And the output selector comprises the respective fonts outputted from LSB to MSB. In claim 1, The synchronized screen A first OSD font position for forming the synchronized screen between the video screen and the OSD message for proper viewing when the display device is in the 0 ° position; A second OSD font position for forming the synchronized screen between the video screen and the OSD message for proper viewing when the display device is in a 90 ° clockwise position; A third OSD font position for forming the synchronization screen between the video screen and the OSD message for proper viewing when the display device is in a 90 ° counterclockwise position; And A fourth OSD font position for forming the synchronization screen between the video screen and the OSD message for proper viewing when the display device is in a 180 ° counterclockwise position OSD font rotating device comprising a position selected from the group consisting of. In claim 9, Wherein each OSD font position comprises one selected from the group consisting of a first mirror image position, a second mirror image position, and a third mirror image position, respectively. In claim 1, And the font ROM used to store the OSD font adopts a basic font as a storage unit. In claim 1, And the font ROM from which the OSD font is read adopts a basic font as a reading unit. In claim 1, And the display device comprises one selected from the group consisting of a CRT screen and an LCD. In the method for rotating the OSD font, Inputting an OSD display command to the CPU to instruct the CPU to begin reading from a plurality of OSD font addresses; Generating a plurality of OSD fonts corresponding to the OSD font addresses stored in a storage device; Reading and passing the OSD font corresponding to the font address, initially stored in a font ROM, to a decoder; Executing a decoding process of the OSD font to form a plurality of rotated fonts; Storing the rotated font in a storage medium; Sequentially outputting the rotated font located on the storage medium to an output circuit; And Displaying an OSD message including the rotated font on a display device to form a video screen and a screen in which the OSD message is synchronized; OSD font rotation method comprising a. The method of claim 14, The decryption process may be performed by using a plurality of decryption elements in accordance with a control signal. Controlling the scanning sequence using a scanning controller that receives the synchronized signal from the synchronization generator during the decryption process, and Selecting an output priority of the rotated font using an output selector OSD font rotation method comprising a. The method of claim 15, And each decryption element for executing the decryption process comprises a plurality of channels. The method of claim 15, And the scan controller for controlling the scan sequence comprises a plurality of channels. The method of claim 15, And the output selector for selecting the output priority of the rotated font comprises a plurality of channels. The method of claim 15, And wherein the scan controller comprises one scan selection selected from the group consisting of X and Y axes. The method of claim 15, And the output selector comprises the respective fonts outputted from MSB to LSB. The method of claim 15, And the output selector comprises the respective fonts outputted from LSB to MSB. The method of claim 14, The synchronized screen, A first OSD font position forming the synchronized screen between the video screen and the OSD message for proper viewing when the display device is in the 0 ° position; A second OSD font position forming the synchronized screen between the video screen and the OSD message for proper viewing when the display device is in a 90 ° clockwise position; A third OSD font position forming the synchronized screen between the video screen and the OSD message for proper viewing when the display device is in a 90 ° counterclockwise position; And A fourth OSD font position forming the synchronized screen between the video screen and the OSD message for proper viewing when the display device is in a 180 ° clockwise position OSD font rotation method comprising a position selected from the group consisting of. The method of claim 22, Wherein each OSD font position comprises one selected from the group consisting of a first mirror image position, a second mirror image position, and a third mirror image position, respectively. The method of claim 14, And the reading of the OSD font uses a basic font as a reading unit. The method of claim 14, And storing the font address comprises using a basic font as a storage unit. The method of claim 14, And displaying the OSD message using a display device selected from the group consisting of a cathode ray tube (CRT) screen and a liquid crystal display (LCD).