KR0139194B1 - Method of time sharing output and apparatus thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to projecting an image of each converged color signal onto a screen using a plurality of CRTs, and more particularly, to a method and apparatus for time division of a converged signal. Means for time-dividing the horizontal and vertical digital convergence signals with respect to the digital convergence of a plurality of color signals, and means for time-dividing the digital convergence of each color signal for the horizontal and vertical digital convergence. The present invention relates to a digital convergence time division method and apparatus capable of shortening the number and enabling efficient circuit construction in terms of economics and circuits.

Description

Time Division Output Method of Digitally Converged Signal and Its Apparatus

1 is a block diagram of a conventional digitally converged signal output device;

2 is a block diagram showing an embodiment of a time division output device for a digitally converged signal according to the present invention;

3 is a control timing diagram of each component of FIG.

4 is a block diagram showing another embodiment of a time division output apparatus for a digitally converged signal according to the present invention;

5 is a control timing diagram of each component of FIG.

Explanation of symbols on the main parts of the drawings

10, 100, 200: Image data storage

110, 210: Data selector 20, 120, 220: D / A converter

130, 230: analog switch unit 30, 140, 240: filtering unit

40, 150, 250: amplification unit 160, 260: temporary storage unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division output method and apparatus for digital converged signals, and more particularly, to reduce the number of D / A converters by digitally converging the color signals projected on the screen and outputting them by time sharing. The present invention relates to a time division output method of a digitally converged signal and an apparatus thereof.

In general, a projection type television includes a plurality of cathode ray tubes (CRTs) for outputting color signals projected on a screen. That is, R-CRT, G-CRT, which outputs a red signal Red (hereinafter referred to as R signal), a green signal (hereinafter referred to as G signal), and a blue signal (hereinafter referred to as B signal), and An image corresponding to each color signal is formed on the screen by the B-CRT. However, due to the different starting point of the beam BEAM in the electron gun projecting the color signal on the screen, the image on the screen cannot be accurately synthesized with R, G, and B. At this time, it is necessary to correct the respective R, G, and B beams so as to correspond to the distances of the respective beams. This is convergence. At the time of the calibration, each of R, G, and B has data for horizontal and vertical directions, and the display screen should be calibrated at the same time. To do this, a D / A converter is required for each output. A block diagram of such a conventional digital convergence device is shown in FIG. The digital convergence apparatus shown in FIG. 1 includes an image data storage unit 10 having a work area divided so that six image signals are processed and stored, and an output digital signal of the image data storage unit 10 as an analog signal. A D / A converter 20 for converting, a filtering unit 30 for filtering each video signal output from the D / A converter 20, and each video signal output from the filtering unit 30. It consists of an amplifier 40 for amplifying and supplying to the CRT.

In FIG. 1, the image data storage unit 10 consisting of DRMA (Dynamic RAM) is divided into six areas 11 to 16 by working area data set in a memory (not shown). Each horizontal and vertical data is processed and stored by the convergence program. The digital image data output from each data area 11 to 16 of the image data storage unit 10 is converted into an analog signal by each D / A converter 21 to 26 of the D / A converter 20. Then, the analog video signal output from the D / A converter 20 is filtered through each low pass filter 31 to 36 of the filtering unit 30 and finally amplified through each amplifier 41 to 46. R-horizontal signal Rh, R-vertical signal Rv, G-horizontal signal Gh, G-vertical signal Gv, B-horizontal signal Gh, and B-vertical signal Bv are output. do. Therefore, in the related art, as shown in FIG. 1, six D / A converters are required if horizontal and vertical are considered for R, G, and B, respectively.

As described above, in the conventional output device, six high-speed D / A converters have been used to convert and output the converted digital data into an analog signal. This was not only a price problem but also an inefficient problem in terms of taking up space.

Accordingly, an object of the present invention is to provide a time division output method and apparatus for digitally converged signals that can reduce the number of D / A converters by appropriately time-dividing the R, G, and B digital convergence signals and the horizontal and vertical digital convergence signals. I am doing it.

According to an aspect of the present invention, there is provided an apparatus for outputting a converted signal for converting converted digital data of a plurality of color signals into an analog signal, the means for generating a control signal, and for converting each of the color signals. A data storage unit for storing vertical and horizontal data, and the vertical and horizontal data for each color signal of the data storage unit according to the first control signal applied from the control signal generating means and repeating the high and low states at predetermined time intervals. A data selector which alternately outputs, and is supplied from said control signal generating means and continuously from said data selector according to a second control signal for generating one clock pulse each during the high and low state periods of said first control signal D / A converter for converting the vertical and horizontal data output to an analog video signal, the It is applied from the control signal generating means to store an analog image signal in a predetermined temporary storage unit and has the same time interval period as that of the first control signal, and high and low states for each clock pulse generation period of the second control signal. An analog switch unit for alternately switching the switch according to the third control signal to be repeated, and a temporary storage unit for temporarily storing and outputting the video signal applied from the analog switch at the same time.

According to another aspect of the present invention, there is provided a device for outputting a converted signal for converting and converting converged digital data of a plurality of color signals into an analog signal, the means for generating a control signal and the convergence of each color signal. A data storage unit for storing the vertical and horizontal data, and the horizontal and vertical data of the data storage unit according to a first control signal applied from the control signal generating means and repeating the states 0, 1, and 2 at predetermined time intervals. A data selector for alternatingly outputting each color signal for the second control signal, which is applied from said control signal generating means and generates one clock pulse each during the 0, 1, and 2 state periods of said first control signal. A D / A converter for converting each color signal continuously output from the data selector into an analog video signal, wherein the analog video 0, 1, and 2 states for each clock pulse generation period of the second control signal which are applied from the control signal generating means to have a call stored in a predetermined temporary storage unit and have the same time interval period as that of the first control signal. An analog switch unit for alternately switching the switch according to the third control signal to be repeated, and a temporary storage unit for temporarily storing and outputting the video signal applied from the analog switch unit at the same time.

According to yet another aspect of the present invention, there is provided a method of outputting a converted signal for converting converged digital data of a plurality of color signals into an analog signal, and outputting the converged vertical and horizontal image data of the respective color signals. Storing the data stored in a predetermined area for each image data, serially outputting data stored in at least two or more areas of the data stored in the plurality of areas for a predetermined time interval, and outputting the digital data serially outputted as analog signals. And outputting the video signal converted into an analog signal for each vertical and horizontal video signal of each color signal.

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

2 is a block diagram of an embodiment of an apparatus for time division outputting horizontal and vertical convergence signals with respect to convergence of respective color signals according to the present invention. The apparatus of FIG. 2 is provided with an image data storage unit 100 that outputs horizontal and vertical convergences for each color convergence, and an output signal of the image data storage unit 100, thereby receiving horizontal and vertical convergence by horizontal and vertical control signals. From the data selector 110 for selectively outputting the signal, the D / A converter 120 for converting the output digital signal of the data selector 110 into an analog signal, and the D / A converter 120 An analog switch unit 130 for selectively distributing data to the horizontal and vertical by the control signal to the output data, and a filtering unit for filtering each horizontal and vertical convergence signal output from the analog switch unit ( 140, the amplifying unit 150 for amplifying each of the standardized waveforms output from the filtering unit 140, and the signal output from the amplifying unit 150 is temporarily stored for a predetermined time to be horizontal for each color signal And vertical di And a temporary storage unit 160 for simultaneously supplying the digital convergence signal to the CRT.

3 is a control timing diagram of each component for explaining the operation of FIG.

In FIG. 2, the image data storage unit 100 made of DRAM (Dynamic RAM) is divided into six regions 101 to 106 by a central processing unit (CPU), which is not shown. The horizontal and vertical convergences of are stored respectively. The digital image data stored in each data area 101 to 106 of the image data storage unit 100 are simultaneously output in synchronization with the clock signal (CLK ₁ waveform shown in FIG. 3) asynchronously with the CPU. The outputs from the DRAMs 101 and 102 of the image data storage unit 100 that resist the horizontal and vertical data of the R color signal are respectively applied to the two input terminals of the first data selector 111 to the data selector 110. The output from the DRAMs 103 and 104 of the image data storage unit 100 storing the horizontal and vertical data of the G color signal is applied to the second data selector 112 of the data selector 110, and the horizontal of the B color signal is applied. The output from the DRAMs 105 and 106 of the image data storage unit 100 storing the and vertical data, respectively, is applied to the third data selector 113 of the data selection unit 11. The data of the two input terminals of the first, second, and third data selectors 111 to 113 are alternated for a predetermined time by a selection signal (SEL ₁ waveform shown in FIG. 3) for controlling the data selector 110. Will output While the selection signal (SEL ₁₎ is high (High) is selected for the horizontal convergence, and the low (Low) Select applied signal (SEL ₁₎ which is output by selecting the vertical convergence. The D / A converters 121 to 123 of the digital image data D / A converters 120 output from the data selectors 111 to 113 of the data selector 110 are respectively applied to the D / A converters 121 to 123. 123 is controlled to alternately perform the D / A conversion of the horizontal and vertical convergence signals by the time division clock signal (CLK _TS1 waveform shown in FIG. 3). That is, the digital image data output from each of the data selectors 111 to 113 of the data selector 110 is synchronized with the time division clock signal CLK _TS1 and each of the D / A converters 121 of the D / A converter 120. 123) is converted into an analog video signal. Then, the analog video signal output from the D / A converter 120 is the low-frequency of each of the filtering unit 140 by the control signal (CS ₁ waveform shown in Figure 3) applied to the analog switch unit 130 Select one of the pass filters 141 and 142 to distribute data selectively. When the control signal CS ₁ is high, the horizontal convergence signal is selected, and when the control signal CS ₁ is low, the vertical convergence signal is selected and output. In order to shape this output into a smooth waveform, the low-pass filter of each of the low pass filters of the filtering unit 140 is used to filter an analog video signal of horizontal and vertical convergence of the R signal output by the first analog switch 131 of the analog switch unit 130. 141, 142). The horizontal and vertical convergence analog signals of the G signal are applied to the low pass filters 143 and 144 by the second analog switch 132 and filtered. The horizontal and vertical convergence analog signals of the B signal are applied to the low pass filters 145 and 146 by the third analog switch 133 and filtered. The filtered waveform is amplified by each of the amplifiers 151 to 156 of the amplifier 150. Since the convergence signal cannot be output at the same time by operating the convergence signal, the amplified signal is temporarily stored through the buffers 161 to 166 of the temporary storage unit 160, and then the R-horizontal signal Rh and R- are simultaneously stored. The vertical signal Rv, the G-horizontal signal Gh, the G-vertical signal Gv, the B-horizontal signal Gh, and the B-vertical signal Bv are output to R-CRT, G-CRT, and Supplied to the B-CRT. Each CRT then projects the converged R, G and B signals onto the screen so that a clear image is formed on the screen.

4 shows a block diagram of another embodiment of an apparatus for time division outputting R, G, B convergence for horizontal and vertical in accordance with the present invention. The apparatus of FIG. 4 receives an image data storage unit 200 for outputting each color convergence for horizontal and vertical convergence, and an output signal from the image data storage unit 200, and receives each color convergence signal by a control signal of each color signal. A data selector 210 for selectively outputting the data, a D / A converter 220 for converting the output digital signal of the data selector 210 into an analog signal, and an output from the D / A converter 220. An analog switch unit 230 for selectively distributing a video signal to be controlled by a control signal, a filtering unit 240 for filtering respective R, G, and B convergence signals distributed from the analog switch unit 230, and filtering The amplifier 250 amplifies each of the standardized waveforms output from the unit 240, and temporarily stores the signal output from the amplifier 250 for a predetermined time and then R, G for the horizontal and vertical signals. Temporary storage for simultaneously supplying B convergence to the CRT (260) )

5 is a control timing diagram of each component for explaining the operation of FIG.

In FIG. 4, the image data storage 200 made of DRAM (Dynamic RAM) is divided into six regions 201 to 206 by cpu (not shown), and each region has R, G, and B convergence and vertical convergence. The R, G, and B convergences of the convergence are stored, respectively. The image data storage 200 which stores the R, G and B convergences of horizontal and vertical convergence is simultaneously output latched in synchronism with the cpu in synchronization with a clock signal (CLK ₂ waveform shown in FIG. 5). The latched horizontal convergence outputs of R, G, and B convergence are applied to three input terminals of the first data selector 211 of the data selector 210, respectively, and the outputs of the R, G, B convergence of the vertical convergence are second. The three inputs of the data selector 212 are respectively applied. The data of the three input stages are selectively outputted by a selection signal (SEL ₂ waveform shown in Fifth) consisting of at least two bits of information controlling the data selection unit 210. When the selection signal SEL ₂ is 0, R convergence is selected, G is converged when 1, and B convergence when 2 is selected. The output digital image data is synchronized with the time division clock signal (CLK _TS2 waveform shown in FIG. 5) applied to the first and second D / A converters 221 and 222 of the D / A converter 220. It is converted into an analog signal. Then, the analog video signal output from the D / A converter 220 is controlled by a control signal (CS ₂ waveform shown in FIG. 5) applied to the analog switch 230. When the applied control signal CS ₂ is 0, R convergence is set to 1, G convergence is set to 1, and B convergence is set to the low pass filters 241 to 246 of the filtering unit 240. To distribute. The waveforms filtered through each of the low pass filters 241 to 246 are applied to each of the amplifiers 251 to 256, and then amplified and amplified by the buffers 261 to 266 of the temporary storage unit 26 to remove the time difference. R-horizontal signal (Rh), G-horizontal signal (Gh), B-horizontal signal (Bh), R-vertical signal (Rv), G-vertical signal (Gv), and B- The vertical signal Bv is output and supplied to the R-CRT, G-CRT, and B-CRT. Each CRT then projects the converged R, G, and B signals onto the screen so that they are formed on the screen of the clear image.

As described above, the digital division time division method and apparatus thereof according to the present invention are compared to the conventional digital convergence D / A output stages, and in the case of an image input signal of multi-sync (Multi Sync.) The data set up time of the A converter must be taken into account. If an image signal having a horizontal scan frequency of 64 kHz is subjected to D / A conversion of 32 samples horizontally with respect to one horizontal scan line, it takes 488 nsec per sample. Time division of horizontal and vertical convergence for R, G, and B convergence can bring about the effect of reducing high speed D / A converters from 6 to 3, which requires a D / A converter with a setup time of at least 244 nsec. Do. In addition, time division of R, G, and B convergence signals for horizontal and vertical convergence can reduce the effect from six to two, and a D / A converter having a setup time of at least 163 nsec is required. This reduces the space occupied by the D / A converter as well as the economics, thereby providing a more efficient circuit configuration in terms of circuitry.

Claims (12)

In the output device of the converged signal for converting the converted digital data for a plurality of color signals to an analog signal and outputting, Means for generating a control signal; A data storage unit for storing converged vertical and horizontal data of each color signal; A data selector for alternately outputting vertical and horizontal data for each color signal of the data storage unit according to a first control signal applied from the control signal generating means and repeating high and low states at predetermined time intervals; Analog and vertical data output from the data selector are continuously output from the data selector according to a second control signal applied from the control signal generating means and generating one clock pulse each during the high and low state periods of the first control signal. A D / A converter converting the video signal; It is applied from the control signal generating means to store the analog video signal in a predetermined temporary storage unit and has the same time interval period as that of the first control signal, and high and low states for each clock pulse generation period of the second control signal. An analog switch unit for alternately switching the switch according to the third control signal which repeats; And And a temporary storage unit for temporarily storing and simultaneously outputting an image signal applied from the analog switch. The digital convergence time division output device according to claim 1, further comprising a low pass filter for filtering an image signal applied from the analog switch, and an amplifier for amplifying the filtered signal. The apparatus of claim 1, wherein the D / A converter is configured to convert the continuously output vertical and horizontal data into an analog video signal for a data set-up time of a video signal having a predetermined horizontal scan frequency. A digital convergence time division output device having a D / A converter having a setup time of at least ½ of the setup time. In the output device of the converged signal for converting the converted digital data for a plurality of color signals to an analog signal and outputting, Means for generating a control signal; A data storage unit for storing converged vertical and horizontal data of each color signal; A predetermined time interval applied from said control signal generating means. A data selector for alternately outputting each color signal for horizontal and vertical data of the data storage unit according to a first control signal which repeats the 0, 1, and 2 states in a cycle: Each color signal, which is applied from the control signal generating means and is continuously output from the data selector according to a second control signal for generating one clock pulse each during the 0, 1, and 2 state periods of the first control signal, is output. A D / A converter for converting an analog video signal; Applied from the control signal generating means to store the analog video signal in a predetermined temporary storage unit and having the same time interval period as that of the first control signal, each of the clock pulse generation periods of the second control signal 0, 1, And an analog switch unit for alternately switching the switch according to the third control signal repeating the two states. And And a temporary storage unit for temporarily storing and simultaneously outputting an image signal applied from the analog switch unit. 5. The time division output device of claim 4, further comprising a low pass filter for filtering an image signal applied from the analog switch, and an amplifier for amplifying the filtered signal. 6. The apparatus according to claim 4 or 5, wherein the D / A converter is configured to convert at least one of the setup time to convert each color signal outputted continuously to an analog video signal for a data setup time of a video signal having a predetermined horizontal scanning frequency. A digital convergence time division output device having a D / A converter having a setup time of. In the method of outputting a converged signal for converting the converted digital data for a plurality of color signals to an analog signal and outputting, Storing the converged vertical and horizontal image data of each color signal in a predetermined area for each image data; Outputting data stored in at least two or more areas among the data stored in the plurality of areas in series for a predetermined time interval; Converting the digital data output in series into an analog signal; And A time division output method of a digitally converged signal comprising the step of outputting a video signal converted into an analog signal for each vertical and horizontal video signal of each color signal. 8. The method of claim 7, wherein the vertical and horizontal image data for each of the color signals are output in series during the time interval. 8. The method of claim 7, wherein the vertical image data of each color signal is serially output during the time interval. 8. The method of claim 7, wherein horizontal image data of each color signal is output in series during the time interval. 11. The method of any one of claims 7 to 10, further comprising: temporarily storing the output analog video signal for each vertical and horizontal video signal and outputting the same simultaneously. Time division output method. 12. The method of claim 11, further comprising filtering and amplifying the output analog video signal for each vertical and horizontal video signal of each color signal.