SU1107337A1 - Control device for matrix television screen - Google Patents

Abstract

A DEVICE FOR CONTROLLING A MATRIX TELEVISION SCREEN, containing serially connected video amplifier, analog-to-digital converter (A / D converter), serial-parallel register, parallel register and digital-to-analog converter (D / A converter), line synchronization unit, whose input is combined with inputs of the A / D converter and column synchromesh block (DAC), the input unit of which is combined with the columns of the synchromesh synchronizer unit and its synchronization unit. the outputs of which are connected respectively to the clock inputs of the DAC and the series-parallel register, a block for selecting a row whose input is connected to the first output The unit of the synchronization of lines, and the outputs of which are the inputs of the lines of the matrix television screen, characterized in that, in order to extend the functionality by providing control of a p-fold (p 2) matrix television screen without complicating the device, a counter and a block of demultiplexers are entered into it connected in series, with the counter input connected to the second output of the row synchronization unit, the information inputs of the demultiplexer unit connected to the corresponding outputs of the D / A converter, the third the synchronization block stroke of the columns is connected to the clock one (input of the parallel register, and the outputs of the demultiplexer block are the inputs of the columns of the matrix television screen).

Description

oo with The invention relates to an image reproduction technique and can be used in television. The closest in technical essence to the proposed device is a device for controlling a matrix television screen containing a series-connected video amplifier and an analog-to-digital converter (AUIIj, two series-parallel registers, the inputs of which are connected to the output of the ADC, and the outputs to the inputs of the corresponding two parallel registers, the outputs of which are connected to the inputs of a digital-to-analog converter), a block of line synchronization, the input of which is combined with the inputs of the ADC and the synchronization block and columns, first and second vyho, gical which are respectively connected to clock v.hodam DAC and the serial-paral Pelny register selecting unit tup ki, which podkt tsochen input to the first output of the block sync lines and the outputs of which are inputs. Matrix TV screen rows whose columns are the inputs of D / C converters. A disadvantage of the known device is the ability to control only a 2-fold matrix television screen and the need to complicate the known device to work with a p-matrix television screen. This is more promising since it allows you to get a higher quality image. The purpose of the invention is to expand the functional capabilities by providing control of a p-fold () matrix television screen. The goal is achieved by the fact that the device for controlling a matrix television screen containing serially connected video amplifier, ADC, serial parallel register, parallel registers and DAC, row synchronization unit, the input of which is combined with ADC and column synchronization inputs, is the first and second the outputs of which are connected, respectively, to the clock inputs of the DAC and the series-parallel register, the row selection block whose input is connected to the first output of the row synchronization block, and the outputs of which are the inputs of the lines of the matrix television screen, the counter and the demultiplexer unit are connected in series, the counter input is connected to the second output of the row synchronization unit, the data inputs of the demultiplexer unit are connected to the corresponding DAC outputs, the third output of the column synchronizer is connected the clock input of the parallel register, and the outputs of the demultiplexer unit are the inputs of the matrix television screen columns. The drawing shows a structural electrical circuit of the device. The device contains a video amplifier 1, ADC 2, column synchronization unit 3, row synchronization unit 4, row selection block 5, a serially parallel register 6 with a capacity of one television line, parallel register 7, DAC 8, which includes 9 pulse pulses, a ruler 10 logical And elements, a line of 11 logical elements OR, counter 12, block 13 demultiplexers, the outputs of which are connected to the columns of a matrix television screen 14.. The device works as follows, ohm. The full television signal is fed to the input of video amplifier 1, from the output of which the video signal goes to the INPUT of the A / D converter 2, and the sync pulses -. to the inputs of blocks 3 and 4 synchronization of columns and rows. Block 4 sync. The row control controls the operation of the row selection block 5, which sequentially selects the rows (horizontal electrodes) of the matrix television screen 14. The digitized video signal from the output of the A / D converter 2 is fed to the information inputs of the serial-parallel register b, the number of channels of which is equal to code on the outputs of the ADC, and the number of bits of the information capacity of each channel number. N columns of the matrix television screen. The information is loaded into the serial-parallel register 6 at a rate determined by the clock frequency following the clock input of the serial-parallel register b from the column synchronization unit 3. After the information of one television line, the field HocTbFo is written to the serial-parallel register b, it is rewritten to parallel register 7 by a command from synchronization unit 3. columns. After rewriting, the recording of the information of the next television line into the serial-pair parallel register b begins. From the outputs of the parallel register 7, the information in the direct code goes to the information inputs of the line 10, consisting of two-input logic elements AND, united into N groups, to the control inputs of which pass pulses of different duration from the generator 9 gradation pulses.

 The generator 9 generates these pulses strictly sequentially during the time of the active part of the line of the television signal displayed on the matrix television screen 14.

The number of pulses produced by generator 9 per line time is n, where n is the coding width of the input information to obtain 2 levels of luminance of each line element. If the duration of the first tonal and fvmy code is taken over, then the duration of the subsequent tones is selected as T 2T, C., etc., according to a power of 2. Depending on the value of the binary code stored in the parallel register 7, at the outputs lines of 10 logical elements AND there appear pulses of corresponding duration, which are at the inputs of logical elements OR cy tt / i and c, and the outputs of them form wads of gradation pulses necessary to obtain a given element brightness. The gradation pulse generator 9 is controlled by the signals from block 3. Column synchronization. Graduation pulses from the outputs of a line of 11 logical elements OR arrive at the inputs of a block of 13 demultiplexers. The number of outputs of each demultiplexer is equal to p (for a p-fold matrix television screen), and the number of demultiplexers is equal to the number of columns. When a signal is sent from block 5 to select the first horizontal electrode (a row / matrix television screen 14 information is sent to each first output of the demultiplexers, resulting in an image of the first row of the first field of the frame. Then the counter 12 controlled by .o - block 4 of synchronization of lines., generates a command to switch demultiplexes. When a signal arrives at the third horizontal; 1b: th electrode; u iJ TV screen, 14 information of the next line passes to the second outputs The multiplexers form the image of the second line of the first field of the frame. S-12. 12. again gives the command to switch the de1-.1 multiplexers, etc., until those hours until the reg- ister of the first field is formed. frame then the counter

0 12 gives the switch command. The multiplexers to the first output ;, and ci1; l work is repeated until all the lines of the first television frame are formed (odd. After this, the signals from the row selector 5 are sequentially fed to the even horizontal electrodes and similarly the image of the iBTOporo frame field is formed .

0

The proposed device allows reducing the number of outputs of the jTopa oscillating pulses, simplifying the structure of the DAC and controlling the p-matrix matrix television screen, without complicating the device:.

Claims (1)

DEVICE FOR CONTROLLING A MATRIX TELEVISION SCREEN, containing a series-connected video amplifier, analog-to-digital converter (ADC), a serial-parallel register, a parallel register and a digital-to-analog converter (DAC), a line synchronization unit, the input of which is combined with the inputs of the ADC and the second column synchronization unit, the outputs of which are connected respectively to the clock inputs of the DAC and the serial-parallel register, the line selection block, the input of which is connected to the first output of the unit and synchronization of lines, and the outputs of which are the inputs of the rows of the matrix television screen, characterized in that, in order to expand functionality by providing control of the p-fold (p? 2) matrix television screen without complicating the device, a counter and a demultiplexer block are introduced into it connected in series, the input of the counter is connected to the second output of the sync block rows, data inputs of the block are joined by the demultiplexers to the respective outputs _{of the} DAC, the third output block B hroniza- <g tion column is connected to the clock input of the parallel register and the demultiplexer block vyho rows are inputs columns matrix TV screen. to the exit of the respective registers, with inputs