SU723621A1 - Device for displaying information on crt screen - Google Patents

Description

one

The invention relates to computing and can be used in display devices for alphanumeric information output from a computer.

Devices for displaying symbols are known, comprising a programmable sensor, a symbol selection unit, a storage and shaping unit, an inverter, AND elements, an input register, paraphase amplifiers for key management, a logic loop ending logic circuit, a binary counter for the number of points, a matrix decoder, a power distributor, inverters, transistor keys of the coordinates of points, a circuit for storing the coordinates of points on the voltage dividers, diode keys for selecting signs, waiting for a pulse generator 1.

The disadvantage of the device is low reliability due to the complex hardware implementation.

The closest is a device for displaying information on the screen of a cathode ray tube (CRT) containing a register, one output of which is connected to one of the inputs of the backlight unit, the other output of the decoder, a pulse generator, the input and output of which are connected respectively to the output and the trigger input controls, amplifiers for vertical and horizontal 2,

The disadvantage of the device is its unreliability.

The purpose of the invention is to increase the reliability of the device.

The goal is achieved by the fact that the device contains the first and second groups of triggers, the elements OR, NOT, AND, the first inputs of which are connected to the corresponding outputs of the decoder and the first inputs of the elements NOT other than the first, the second inputs - with the outputs of the elements OR, except the last and the second inputs of the elements NOT, and the outputs - with the first inputs of the elements OR, except the first, the second inputs of which are connected to the synchronization inputs of the first group trigger, the other inputs of the backlight unit, the amplifier inputs vertically and horizontally, the trigger outputs in the second group, the synchronization inputs of which are connected to the output of the pulse generator, the set-up inputs to the control trigger output, the corresponding trigger inputs of the first group, the outputs of which are connected to

the inputs of the elements NOT whose outputs are connected to the information inputs of the second group trigger, the first input of the first element OR is connected to the first output of the decoder and the input of the first element NOT, the output of the last element OR connected to the input of the control trigger.

The drawing shows a block diagram of the device.

The device contains a register 1, a light unit 2, a decoder 3, a control trigger 4, a pulse generator 5, elements OR .6, elements AND 7, elements HE 8, 9, the first group of triggers 10, the second group of triggers 11, amplifiers 12 and 13 vertically and horizontally.

The device works as follows

In the initial state, the control trigger 4 is in a single CONDITION. The voltage on its inverse output has a low potential, which ensures the establishment of triggers of the second group 11 and triggers of the first group 10 to the zero state.

The information to be displayed on the screen of a CRT as a character code is recorded in register 1. When a pulse arrives, a signal arrives at the input of control trigger 4 at its inverse output a signal arriving at the input of pulse generator 5,

The pulse generator 5 begins to generate a sequence of pulses, which is fed to the inputs: synchronization of control trigger 4 and triggers of the second group

eleven.

In the formation of information signals for the second group of trigger 11, the pre-di-3 is involved, the first group of triggers 10, the elements OR 6 and 7 and HE 8, HE 9,

Before starting the triggers of the first group 10 are in the zero state and in the absence of the SI1

The signal at the outputs of the decoder at the information input of the first trigger of the second group 11 appears.

In the absence of signals at the outputs of the decoder, all triggers of the second group 11 and the device sequentially take part in the operation. generates and displays a time sequence corresponding to the full set of elements of the figure / from which symbols are formed. At the same time on the prohibiting inputs of all elements of HE 8 and HE 9 signals are missing,

With the start of work, the first trigger of the second group 11 is transferred the id of the zero state to one. The impulse from its output goes to the corresponding IIC | l backlight block input

i ;, the inputs of amplifiers 12 and 13 vertically and horizontally, the synchronization input of the first trigger of the first group 10 and through the element OR b to the inputs of the first element AND 7 and the element NOT 9, The first trigger of the first group 10 goes into one state and blocks with element 8, the arrival of the signal at the information input of the first trigger of the second group 11, which is transferred to the zero state by the second pulse from the pulse generator 5, at the same time the pulse from the output of the first trigger of the second group 11 through the corresponding element OR b, the first element NOT 9 enters the information input of the second trigger of the second group 11, which is transferred from the zero to one state with the second pulse received from the pulse generator 5. Similarly, all the triggers of the second group 11 are switched until the pulse from the output of the last element OR 6 arrives at the information input of the control trigger 4, setting it to one state, prohibiting the operation of the pulse generator 5.

The triggers of the first and second groups 10, 11 are set to the zero state. The formation process is also terminated when the control signal 4 is set at the installation input of the installation O,

In the case of a signal to one of the outputs of the decoder 3, the trigger of the second group 11, which corresponds to this output, is excluded from the pulse propagation sequence. At the same time, the signal from this output of the decoder 3 acts on the elements AND 7 and HE 9 of the specified bit

The impulse from the trigger output of the second group 11 and the OR element of the previous bit is passed through the elements of AND 7, OR b of the specified bit and enters the information input of the NOT element 9 of the next bit, from the output of which it goes to the input of the corresponding trigger.

The beam bypasses only those elements that are necessary to form the displayed symbol.

Claims (2)

1. US patent 3426344, cl. 340-324, 1969. 2. Authors certificate of the USSR 530338, 006 K 15/20, 1976.