KR0142734B1 - Screen control device for image information display apparatus - Google Patents

Abstract

In order to provide a screen compensating apparatus for the image information display to prevent the blanking or overlapping of the screen by forcibly presetting the output data when the command for displaying the image information cannot be performed normally, The counting operation starts when the rotational state is changed to an abnormal state, and when the counting value reaches the setting value, the control signal is output so that the background color of the display device can be output as the setting color regardless of the state of the signal read from the compact disc. A synchronization check means for outputting the SB) to the SRAM interface and outputting a signal SE for loading color values at respective addresses of the color search table when the rotation state of the compact disc is changed to a normal state; Color search table loading means for executing a counting operation according to the state of the signal SE to output an address signal of the SRAM so that a corresponding color value can be recorded at a set SRAM address; Memory presetting means for presetting an address value of the SRAM stored in the DRAM to a value already set and outputting a signal SC of a corresponding state according to a preset operation state; Input data checking means for reading data input from the compact disc and executing a corresponding command; General play mode means for outputting the color of one frame corresponding to the data recorded in the DRAM; If the command read out from the compact disc is an exclusive OR command, it consists of a character output mode means for outputting data capable of executing the output and delete operations of the character.

Description

Screen correction device for image information display

1 is a block diagram of a screen correction apparatus of an image information display according to an embodiment of the present invention;

2 is a detailed circuit diagram of a synchronization check unit according to an embodiment of the present invention;

3 is a detailed circuit diagram of a CLUT loading unit according to an embodiment of the present invention;

4 is an image output schematic diagram of an image information display apparatus according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen correction apparatus for a compact disk graphics display (CDG). In particular, normal data is read when a normal command cannot be executed due to a high speed search or an impact during operation of a display for outputting image information. It relates to a screen correction apparatus of the image information display that can be forcibly reset the state of the screen until it is.

The video information display is a device that can display a number of still images and characters that are set by using the subcode area of the Compact Disk. It is expanding.

In order to allow a plurality of set still images and texts to be displayed at the position of each set screen, the image information display system includes a DRAM (DRAM) for storing an address signal of one frame of image information for output. Memory) is required.

There is also a need for an SRAM (Color RAM) for a color look up table (hereinafter referred to as CLUT) for storing aberrations corresponding to various colors that can be displayed on a monitor.

A preset command for presetting the DRAM to a set address signal corresponding to a set color value and a CLUT color command for storing a corresponding color value of a color search table stored in the SRAM are performed.

The write font command is for storing data on the image in the DRAM, and the exclusive-OR font command is for outputting and erasing a character corresponding to the background screen.

Therefore, each corresponding command is executed according to the state of the signal read out from the compact disc to output the image data recorded at the corresponding address of the SRAM corresponding to the address signal stored in the DRAM to display the image corresponding to one frame to the display device. Print the data and let it print the corresponding character.

However, when a large shock is applied to the image information display device or a normal read or write operation is not performed due to a high-speed search or the like, and the output operation of the data is not normally performed, a blanking phenomenon occurs on the screen. Many problems occur, such as scaring the video.

Therefore, when the CLUT color command is not normally executed, the data for the color stored in the SRAM cannot be read, and thus the desired color is not displayed or the entire screen is changed to a black state.

If the light font command is not executed, the screen state is not normal because the image stored in the corresponding address of the DRAM is not output.

In addition, if an error occurs in the exclusive OR font command that controls the output and deletion of the corresponding character according to the background screen, normal character data is not displayed or deleted. Unreadable problems occur.

Therefore, an object of the present invention is to solve the above-described problems, and if the reading and writing operations of the data are not normally performed because the command for displaying the image information is not normally performed, the output data is forcibly preset. It is an object of the present invention to provide a screen correction apparatus of an image information display for preventing blanking or overlapping of a screen.

The configuration of the present invention for achieving the above object,

When the first clock signal and the sync check signal are input, the counting operation starts when the state of the sync check signal is changed due to an abnormal state of the compact disc, and the signal read out from the compact disc when the count value reaches the set value. Outputs the control signal to the SRAM interface so that the background color of the display device can be output in the set color regardless of the state of the display device.If the rotation state of the compact disc is changed to the normal state, the color value is loaded at each address of the color search table. A synchronization check means for outputting a signal to enable the operation;

The operation state is changed according to the state of the signal applied from the synchronization check means, and the corresponding color value is recorded at the address of the SRAM determined by outputting an address signal of the SRAM by executing a counting operation according to the second clock signal. Color search table loading means for enabling;

When the operation of the color lookup table loading means is completed and the state of the output signal is changed, the address value of the SRAM stored in the DRAM is preset to a preset value, and when the presetting operation is completed, data corresponding to the DRAM is stored. Memory presetting means for outputting a signal to output to the display device and to execute a command read from the compact disc;

Input data checking means for operating in accordance with a signal output from said memory presetting means to read data input from a compact disc and execute a corresponding command;

General play mode means for outputting a color of one frame corresponding to data recorded in the DRAM according to the operation of the input data checking means;

When the command read out from the compact disc in accordance with the operation of the input data checking means is an exclusive OR command, it comprises a character output mode means for outputting data capable of executing the output and delete operations of the character.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

1 is a block diagram of a screen correction apparatus of an image information display according to an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of a synchronization check unit according to an embodiment of the present invention, and FIG. 3 is a color search table according to an embodiment of the present invention. Detailed circuit diagram of the loading section, Fig. 4 is a schematic diagram of the video output of the video information display apparatus according to the embodiment of the present invention.

Looking at the configuration of the present invention with reference to FIG.

When the first clock signal CK1 and the synchronization check signal LKFS are input, the duration is counted when the rotation state of the compact disc is abnormal and output as a corresponding control signal SE, and the rotation state of the compact disc returns to the normal state. A synchronization check unit 1 for outputting a control signal SE capable of determining whether or not it is variable;

CLUT loading unit (2) for receiving a signal (SE) output from the synchronization check unit 1 and the counting operation is performed according to the state of the input signal to store a predetermined color value at each address of the CLUT,

It operates according to the signal output from the output signal PE of the CLUT loading unit 2 to preset the memory in which each address corresponding to one frame is stored and the state of the output signal SC varies according to the operation state. A memory presetting section 3,

An input data check unit for changing an operation state according to the state of the signal SC output from the memory presetting unit 3 to read data input from the compact disc to execute a corresponding operation according to the state of the data ( 4) with,

A character output mode unit 5 for outputting a corresponding character to a display device according to a state of a signal output from the input data check unit 4;

According to the state of the signal output from the input data check unit 4 is composed of a normal play mode (6) for outputting the image data corresponding to each frame to the display device.

As shown in FIG. 2, the synchronization check unit 1 includes an inverter G11 through which the first clock signal CK1 is input as an input terminal and an inverter Gl2 through which the synchronization check signal LKFS is input as an input terminal. ), A NOR gate Gl3 having a first input terminal connected to an output terminal of the inverter G11, and a clock terminal CK connected to an output terminal of the NOR gate G13, wherein the inverter ( A counter 11 having a reset terminal RB connected to an output terminal of Gl2), an input terminal connected to an output terminal of the counter 11, and an output terminal connected to a second input terminal of the NOR gate G13. The signal combination unit 12 is connected, the latch unit 13 is connected to the output terminal of the signal combination unit 12, and the input terminal is connected to the output terminal of the inverter Gl2. The first input terminal is connected to the inverter Gl4 and the output terminal of the latch unit 13, and the second input terminal is connected to the output terminal of the inverter Gl4. AND gate G15 to which an input terminal is connected, an inverter Gl6 to which the signal SC output from the memory presetting unit 3 is input, and a first input terminal to an output terminal of the inverter Gl6. And an AND gate G7 connected to the output terminal of the signal combination unit 12 and a second input terminal.

As shown in FIG. 3, the CLUT loading unit 2 includes a counter 21 for inputting a second clock signal CK2 to the clock terminal CK and outputting an output signal of 16 bits, and the synchronization checker. An AND gate G2l to which an output signal 55 of the AND gate G15 of (1) is input as an input terminal, and an output terminal is connected to a reset terminal RB of the counter 21, and the counter 21 A flip flop 22 having an input terminal connected to an output terminal of the input terminal, and an input terminal connected to an output signal PE of the flip flop 22, and an output terminal connected to a second input terminal of the AND gate G21. Inverter G22 is connected.

In order to output corresponding image data to a display device so that a desired image can be outputted, the first image is output according to a state of a signal input to the first to third enable terminals EA to EC, as shown in FIG. And a multiplexer 104 for selectively outputting data input to the third input terminals A to C.

The operation of the present invention made as described above is as follows.

When the power supply and the driving signal required for the operation are input and the image information display device is operated, the rotation speed of the compact disc included in the display device is determined by the operation of a control device (not shown) to determine whether the normal rotation speed is maintained. To judge.

Therefore, when the rotation speed of the compact disc is rotating at the normal speed, the state of the synchronous check signal LKFS input to the synchronous check unit 1 maintains the high level H state.

However, when the rotating speed of the rotating compact disc is not rotating at the normal speed, the state of the synchronization check signal LKFS is changed to the low state L state.

Therefore, when the rotation operation of the compact tusk is normally performed and the state of the synchronous check signal LKFS is maintained at the high level, the signal stored in the DRAM and the SRAM is normally operated because the compact disc shown in the present invention is normally operated. The video and text output operation is executed according to the state of.

However, when the synchronization check signal LKFS output from the control device (not shown) is changed to the low level L state and input to the synchronization check unit 1, an operation for correcting the image output state of the display device is started.

Therefore, when the low level L state synchronization check signal LKFS is input to the synchronization check unit 1, the high level H signal is reset through the inverter G12 of the synchronization check unit 1 and the reset terminal RB of the counter 11. The counter 11 operates according to the operation of the first clock signal CK1 inputted through the inverter Gll and the clock terminal CK through the NOR gate G13.

Therefore, the counter 11 operates while the sync check signal LKFS maintains the low level in the L state, and the corresponding signal is output to the signal combination unit 12.

When the signal corresponding to the counter value set by the counter operation performed by the first clock signal CKI and the synchronization check signal LKFS is output through the output terminal of the counter 11, the output of the signal combination unit 12 is output. The state usually changes from L, which is a low level, to H, which is a high level.

When the operation time in which the compact disc is abnormally operated as described above reaches the set time set by the counter operation of the counter 11, the one side input of the NOR gate G13 is output by the output signal of the signal combination unit 12. The signal normally varies from the low level L state to the high level H state.

Therefore, the operation of the counter 11 is stopped because the state of the signal input to the clock terminal CK of the counter 11 remains at the low level regardless of the first clock signal CK1.

In addition, the output state of the signal combination unit 12 is changed to the high level H state, and the output signal SC of the memory presetting unit 3 which maintains the low level L state at the normal level is used to control the AND gate Gl7. The output signal SB is changed to the high level H state and output to the SRAM interface and input to the second enable terminal EB of the multiplexer 104 shown in FIG.

Therefore, since the high level H is input to the second enable terminal EB, the output terminal OUT of the multiplexer 104 is input to the third input terminal C, and the image data already set during the correction operation is performed. Output 102.

Therefore, regardless of the image data read from the compact disc, the background color of the color that is already set is forcibly output to the display device, so that the clean color that has already been set can be output during the correction operation of the image information display device.

As described above, when the sync check signal LKFS is maintained at the low level L state for longer than the set time, the output state of the display apparatus is changed as described above until the sync check signal LKFS is changed to the high level H state. Retains the color already set regardless of the input data.

However, when the rotation speed of the compact disc is changed to a normal state and the synchronous check signal LKFS is changed to a high level H state, a low level L signal is inputted to the reset terminal RB of the synchronous check unit 1, and the counter ( Operation of 11) does not continue.

Then, the output signal of the high level signal combination unit 12 stored in the latch unit 13 and the synchronization check signal LKFS are input to the input terminal of the inverter Gl4, and the high level is output to the output terminal of the AND gate G15. H signal is output.

When the output signal SE of the AND gate G15 of the synchronization check unit 1 is changed from the low level L state to the high level H state, the rotation state of the compact disc is determined to be normal and read from the compact disc. The operation of the display device can be controlled according to the data.

Therefore, when the output signal SE of the high-level H sync check unit 1 is input to the CLUT loading unit 2, the output signal of the AND gate G2l is changed from the low level L state to the high level H normally. It is input to the reset terminal RB of the counter 21.

Accordingly, the counter 21 is changed from the reset state to the normal operation state according to the output signal of the AND gate G21 and performs a counting operation according to the second clock signal CK2 input to the clock terminal CK.

The 16-bit counter signal output according to the counting operation of the counter 21 is used as an address signal of an SRAM not shown through the SRAM interface.

Accordingly, when the corresponding address is determined according to the output signal of the counter 21, the color values of each of the red, green, blue (R, G, B) bits of 4 bits which are already set at the determined address of the corresponding SRAM are also determined. It is output to SRAM through SRAM interface and stored in the relevant address.

When all the address signals are output according to the operation of the counter 21 and all the color values already set in the SRAM are stored, the state of the signal PE output through the flip flop 22 is usually low level. It changes from the L state to the high level H state.

Therefore, the output signal of the AND gate G21 input to the reset terminal RB of the counter 21 is changed to the low level L state, and the counter 21 is reset to stop the counting operation.

In addition, since the output signal PE of the CLUT loading unit 2 having a high level is input to the memory presetting unit 3, the memory presetting unit 3 stores a DRAM in which address information corresponding to color information of one frame is stored. The value of is preset to the value corresponding to the color information already set.

When the operation of presetting the value of the DRAM to a value already set as described above is completed, the memory presetting unit 3 performs a fourth operation through the synchronization check unit 1, the input data check unit 4, and the SRAM interface. The output signal SC, which is input to the third enable terminal EC of the multiplexer 104 in FIG. 3, is changed from the low level L state to the high level H state.

Therefore, the state of the signal input to the inverter Gl6 of the synchronization check unit 1 is changed to the high level H state, and the output signal SB of the AND gate G17 is changed to L which is the low level.

Therefore, the signal applied to the second enable terminal EB of the multiplexer 104 of FIG. 4 is low and variable L, and the signal applied to the third enable terminal EC is variable high H. As the signal output to the output terminal OUT of the lexer 104, data input to the third input terminal C is output.

Therefore, when the operation of the memory presetting unit 3 for initializing the image of the display device is completed, the state of the output signal SE of the synchronization check unit 1 and the output signal SC of the memory presetting unit 3 is completed. Since is changed, corresponding image data of one frame stored in the color search table of the SRAM is normally output to the display apparatus according to the signal read out from the compact disc.

In response to the output signal SC of the memory presetting unit 3, which is at a high level, the input data check unit 4 operates to read out data written on the compact disc and execute the operation.

Therefore, when a command for presetting the memory presetting unit 3 or a command for loading the color search table with the corresponding color values is input, the normal play mode unit 6 determines that the initial operation state is normally outputted. To operate.

By operating the normal play mode unit 6, the address signal recorded in the DRAM is read, and the corresponding address signal is output to the display device so that the color of one frame stored at the corresponding address of the SRAM can be output to the display device. Is output via

However, when the exclusive logical OR font command for controlling the output operation of the character is read, the character output mode unit 5 operates to execute the output and deletion operations of the character.

At this time, the color value already set according to the corresponding video signal is ignored, and the corresponding color value and operation of the character are controlled based on the initial color value set by the preset operation of the DRAM.

Therefore, when the address signal stored in the DRAM is a preset value, the address of the DRAM can be output so that the color of the character or the corresponding color value appearing at the edge of the character can be output according to the font value of 0 or 1 read from the compact disc. Variable the signal.

Therefore, through the exclusive OR operation, the address signal of the DRAM capable of outputting the corresponding color is changed and recorded so that the characters of the corresponding color can be output to the display device.

When the exclusive OR command is read from the compact disc again, the character output mode unit 5 reads out the address value of the variable DRAM, and if the read signal is an address signal for outputting a character, the character output mode unit 5 displays the color of the character output to the display device. In order to change to another color in sequence, the address value of the DRAM is changed again and then recorded.

If the read address of the DRAM is a signal for sequentially changing the color of the corresponding character, the character of the DRAM outputted to the display device may be deleted by changing and storing the DRAM signal to an initial preset state again by an exclusive OR operation. Make sure

That is, when the exclusive OR statement is read, the character output, character scroll, and character delete operations are executed according to the value of the DRAM at that time.

Therefore, when the exclusive logical OR command is read from the compact disc, the exclusive logical OR command is used to vary the value of the DRAM designating the corresponding address of the SRAM and to write the variable, thereby executing the output and delete operation of the corresponding character.

However, if the status of the signal read from the compact disc is changed to the normal mode when a preset memory command or color command is received, the signal is input from the compact disc without executing a separate operation by judging it as an error signal due to noise or the like. Read the data.

In the standby state in which the image information display system is not driven after the power supply, an image set when the system state is in the standby state by setting the signal SA input to the first enable terminal EA to a high level H. Allow data 101 to be output.

Therefore, the two states can be visually distinguished by different color values output to the display device during the standby state of the image information display system and the screen correction operation.

As described above, when the rotation state of the compact disc rotating to output the image information is abnormal and the data reading operation cannot be normally executed, the color that is already set is output to the display device so that the image is overlapped or blanked. You can prevent it.

The output operation of the corresponding character may be normally executed while the output state of the display apparatus is forcibly changed to the set color.

The operation standby state and the screen correction operation state of the image information display system may be distinguished by using the set background color.

Claims (7)

When the first clock signal CK1 and the sync check signal LKFS are input, the counting operation is started when the state of the sync check signal LKFS changes due to an abnormal state of the compact disc, and the count value is a set value. When is reached, the control signal SB is output to the SRAM interface so that the background color of the display device can be output in the set color regardless of the state of the signal read out from the compact disc, and the rotation state of the compact disc is changed to the normal state. A synchronization check means for outputting a signal SE for loading a color value at each corresponding address of the color search table; The operation state is changed according to the state of the signal 53 applied by the synchronization check means, and a counting operation is performed according to the second clock signal CK2 to output an address signal of the SRAM to correspond to the set SRAM address. Color search table loading means for allowing color values to be recorded; When the operation of the CLUT loading means is completed and the state of the output signal PE is changed, the address value of the SRAM stored in the DRAM is preset to a preset value, and when the presetting operation is completed, data corresponding to the DRAM is completed. Memory presetting means for outputting a signal SC for outputting a signal to a display device and for executing a command read from the compact disc; Input data checking means for operating in accordance with a signal SC output from said memory presetting means to read data input from a compact disc and execute a corresponding command; General play mode means for outputting a color of one frame corresponding to data recorded in the DRAM according to the operation of the input data checking means; instructions read from a compact disc according to the operation of the input data checking means And a character output mode means for outputting data capable of outputting and deleting the corresponding character in the case of an exclusive OR command. 2. The synchronizing check means according to claim 1, wherein the synchronizing check means comprises: a first inverting means (G11) for inputting a first clock signal (CK1) to an input terminal and a second inverting means for inputting a synchronization check signal (LKFS) to an input terminal. (Gl2), a negative logic sum means (G13) having a first input terminal connected to the output terminal of the first inverting means (Gll), and a clock terminal (CK) at the output terminal of the negative logic sum means (Gl3). A counter 11 connected with a reset terminal RB to an output terminal of the second inverting means Gl2, and an input terminal connected to the counter 11 and the output terminal, A signal combining unit 12 having an output terminal connected to the second input terminal of Gl3), a latch unit 13 having an input terminal connected to the output terminal of the signal combining unit 12, and the second inverting means. Third inverting means Gl4 having an input terminal connected to an output terminal of Gl2, and an output terminal of the latching means 13; A signal output from the first logical multiplier G15 and a memory presetting unit 3 having a first input terminal connected thereto and a second input terminal connected to an output terminal of the third inverting means G14; A first input terminal is connected to the fourth inverting means Gl6 inputted by the (SC) character and an output terminal of the fourth inverting means G16, and a second input terminal is connected to the output terminal of the signal combination unit 12. A screen correction apparatus for image information display, characterized in that it comprises a second logical multiplication means (Gl7), The method of claim 2, wherein the signal combination unit 12 changes the state of the output signal when the counting value of the counter 11 operating according to the clock signal input to the clock terminal CK reaches a set value. A screen correction apparatus for a video information display. The color search table loading means according to claim 1, wherein the color lookup table loading means comprises: a counter 21 for inputting a second clock signal CK2 to the clock terminal CK and outputting an output signal of n bits; The output signal SE of the AND product G15 is input to an input terminal, and the AND signal G21 having an output terminal connected to the reset terminal RB of the counter 21 and the output of the counter 21. A fluff flop 22 having an input terminal connected to the terminal, an input terminal connected to the output signal PE of the flip flop 22, and an output terminal connected to a second input terminal of the AND product G2l. And a reversal means (G22). The screen correction apparatus for a video information display. The method of claim 1, wherein the synchronization check means outputs a control signal SB to the SRAM interface capable of outputting a background color different from that of the normal state when the compact disc is maintained in an abnormal state for a predetermined time or more. Screen correction apparatus for a video information display, characterized in that. The method of claim 1, wherein when the command read out from the compact disc according to the operation of the input data checking means is an exclusive OR command, the image data is varied according to the preset data of the DRAM regardless of the image data to be read. A screen correction device for displaying video information. The screen of the image information display according to claim 1, wherein the screen is switched to a normal play mode when a command for presetting a state of a DRAM or a command for resetting a color value of one frame at a corresponding address of the SRAM is read. Compensator.