RU1795512C - Display unit - Google Patents

Abstract

The invention relates to automation, computing and measurement technology and can be used in devices for displaying information with dynamic control by the method of interrogation. SUMMARY OF THE INVENTION: the device comprises 1 clock generator (1), 1 polling unit 2, 1 memory unit (4), 1 indicator (3), 1 AND element (5), 1 delay elements (6). 1-2-3, 2-4-6-5-3. 4-5. 3 ill.

Description

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The invention relates to automation, computing and measuring technology and can be used in devices for the visual presentation of information with dynamic control by the method of interrogation ..

A device for indicating comprising a pulse generator, a counter and a code converter, the outputs of which are connected to the segment inputs of the indicator, the control inputs of which are connected to the outputs of the D-flip-flops, a block of delay elements (from delay elements connected in series), the input of which is connected to the output of the pulse generator, and the outputs are connected to the C-inputs of the D-flip-flops and to the read-in inputs of the registers, the outputs of which are connected to the first inputs of the comparison circuit, in which the second inputs The odes are connected to the outputs of the counter, and the output to the D-inputs of the D-flip-flops.

In such a device, before forming an image of each of the symbols, the registers are sequentially polled (by signals from the outputs of the delay elements), the information code combination extracted from each register is compared with the reference combination from the counter, and the comparison result is written to the D-trigger of the corresponding bit. From the D-flip-flop, the result of the comparison is output to the control inputs of the indicator, providing a glow of the displayed symbol.

The disadvantage of this device is the relatively low image quality due to the low brightness of the image glow (the symbol does not display the entire interval allotted for it: part of the interval is spent on the formation of the indicator control signal) and low contrast (during the formation of the control signal, this symbol is highlighted in several bits of the indicator, which should be extinguished with this information, this appears in the image backlight).

A device for indicating is known that contains switching elements in which the outputs are connected to the code converter through the block of OR elements, and the inputs are connected to the outputs of the registers and to the corresponding outputs of the pulse distributor, and indicators, the control inputs of which are connected via the formers to the corresponding outputs of the distributor , and the corresponding segment inputs are combined and connected to the outputs of the code converter.

In such a device, sequential bitwise output to the indicators of the information stored in the registers is carried out.

The steepness of the signal fronts at the outputs of the shapers, which ensure matching of the indicator levels and the control logical nodes, is lower than that of the signals of these control nodes. This is due to the relatively large amplitude of the currents of the formers. For example, in the case of a seven-segment LED indicator with a luminous current of the 30 mA segment, the driver is a transistor

5 medium power switch with a maximum switching current of 270 mA. For such keys, the steepness of the signal fronts is lower than for the logical elements of the popular IC series.

0 as a result of tightening the shutdown of the former on the indicator of the previous category, the symbol of the current category, the code of which is currently located on the segment inputs of all indicators, will be highlighted for some time. This leads to highlighting, albeit briefly, in the previous category of extra segments, that is, to highlight the image during transients

0 when the indicator of the current category is turned on and the previous one is turned off. .

This leads to a relatively low image quality as a result of a decrease in contrast, low reliability due to

5 decrease in indicator life and high power consumption.

A device for indicating is known, the closest known and selected as a prototype, containing a constant sensor controlled from a pulse generator, in which the outputs of the first group are connected to the control inputs of the indicator, and the outputs of the second group are connected to the address inputs of the memory unit, information whose input inputs are information inputs of the device, the block of AND elements, whose outputs are connected to the segment inputs of the indicator, the first inputs - with the outputs of the block of delay elements, and the second inputs - with outputs memory, and the input of the block of delay elements connected to the output of the generator.

In the device, the segments of the indicator are turned on and off respectively at the beginning and end of the polling pulses of each of the bits of the indicator with a delay on / off of the segments relative to each other. In this case, the current of each of the control inputs of the indicator changes by steps along the on / off segments of the symbol. Step of the step is the current of one switched on segment.

The disadvantage of the prototype is the relatively low brightness of the image.

The aim of the invention is to improve image quality by increasing its brightness.

This is achieved by the fact that an indication device containing a clock generator whose output is connected to the clock input of the polling unit, the outputs of the first group of which are connected to the control inputs of the indicator, and the outputs of the second group to the address inputs of the memory unit, the outputs of which are connected with the first inputs of the AND elements, and the information and control inputs are respectively the information and control inputs of the device, the second inputs of the AND elements are connected to the outputs of the delay elements, and the outputs are connected to information inputs of the indicator, new communications have been introduced: the inputs of the delay elements are connected to the corresponding outputs of the memory unit.

The essence of the invention is as follows.

For some time, coming at the end of the time interval for image formation in a particular indicator bit and at the beginning of the formation of the next bit, the AND elements from information code combinations (in the segment code) of the current bit (from the output of the memory block) and the previous bit yes (from the outputs of the delay elements during the delay time), code elements common to the symbols generated in these neighboring bits are allocated. During transient processes, when the current-discharge luminance enable signal is turned on and the previous one is turned off, the segment luminance enable signals common to the data symbols of neighboring bits are supplied to the segment inputs of the indicator. There is no illumination of other segments. The luminosity of the symbols due to the increase in the luminescence time of the segments common for the symbols of neighboring bits of the indicator is increased compared to the prototype, in which the segments are turned off during transients.

Compared with the prototype, the claimed solution contains new connections (the inputs of the delay elements are connected to the corresponding outputs of the memory unit) in the absence of several connections of the prototype (connection of the input of the block of delay elements to the output of the pulse generator, serial connection of delay elements).

Figure 1 shows the functional diagram of the claimed device; figure 2 is a functional diagram of an embodiment of a block of delay elements; in Fig.3 is a timing diagram of the operation of the device.

The indicator device comprises a clock generator 1, a polling unit 2 controlled by it, in which the outputs of the first group are connected to the control inputs of the indicator 3, and the outputs of the second group are connected to the address inputs of the reading of the memory unit 4, information and control inputs which are, respectively, information and control inputs of the device, AND 5 elements in the number of segments of the indicator 3, in which the outputs are connected

0 with segment inputs of indicator 3, and the inputs are connected to the corresponding outputs of memory unit 4: the first inputs are directly, the second through delay elements 6.

5 All elements and units used in the device are well-known or well-known, in particular, widely used in display devices.

Generator 1 includes actually

0 pulse generator with a frequency limited from below by the condition for obtaining a flicker-free image (the pulse duration from the generator is chosen slightly longer than possible transients

5 when the bits are turned on / off). The polling unit 2 is implemented, for example, on the basis of a counter on n (n is the number of bits of the indicator) and a decoder connected to it (if necessary, s.

0 by agreement with the indicator level). Reading information from memory unit 4 is bitwise: for each of the bits according to the read signal at the address inputs of memory unit 4, its output appears

5 corresponding, for example, a seven-element information word corresponding to one of the symbols of the alphabet. Such RAM with write and read circuits can be implemented, for example, based on

0 IC type 133RU2. Indicator 3 - p-bit sign-synthesizing (example: ALS354A).

Delay elements 6 can be implemented based on repeaters on IC with

5 relatively long delay times (example: IC series 134, 564). Trigger based delay can be implemented. . Figure 2 presents a diagram of the implementation of the delay of the parallel register 7 with the input of the parallel recording on the trailing edge of the pulse from the generator 1 (example: 533ТМ9). ;

The device operates as follows.

Under the action of pulses from generator 1, the polling unit 2, by signals from the outputs of the first group, sequentially polls the bits 1,2 ... p of indicator 3, applying enable signals to the control input of each of the bits. The signals from the outputs of the second group in the read address code are used to interrogate the bits of memory block 4. The output of information from memory block 4 is in the code of segments. According to the polling signal, at the control input of indicator 3 and its digit, a symbol is displayed whose code is currently located on the segment inputs of indicator 3. i.e. information related to this section (stored in the corresponding section of the memory block 4). According to the next pulse from the generator 1, the sensor of constants 2 will take the next state corresponding to the next bit, etc.

In the time diagram (see FIG. 3) corresponding to the embodiment of the block of delay elements based on triggers, the polling unit 2 is switched on the leading edge of the pulse from the generator 1. The memory unit 4 provides the bit information in the form of a code combination in the code of segments A1. ..G1, corresponding to one of the symbols of the alphabet, practically along the leading edge of the pulse from generator 1. The signals at the corresponding outputs of the first group of block 2 change with a certain delay with respect to the leading edge of the pulse from generator 1. Change and Information in register 7 - on the trailing edge of the specified pulse.

Over the duration of the pulse from the generator 1 (when using delay elements 6, for the delay time of such elements), elements of the information code combination of the current bit (for example, character code 5 of the 2nd bit of the device) from outputs A ... G1 of memory unit 4 is compared by AND 5 elements with corresponding elements of the previous bit code combination (with character code 2 of the 1st bit) from outputs A11, .. G11 of register 7 (delay elements

6). If both elements of these combinations are equal to Log.G, then from the output of the And 5 element to the corresponding segment input of indicator 3, a segment enable signal is supplied. Thus, segments common to the characters of the current and previous bits are included.

In time, the pulse of generator 1 overlaps transients when changing the states at the outputs of the first group of sensor 2, therefore, when changing signals at the control inputs of indicator 3, the simultaneous presence of enable signals at two inputs will lead to the display in these bits of segments common to symbols

these bits. There is no highlighting for other segments.

The technical and economic effect consists in improving the image quality by increasing the brightness of the image formed by the indicator: if the prototype has all segments in both adjacent bits turned off at the time of the transient, the segments common to the symbols of these bits are displayed in the connected device.

In fact, the inventive device based on elements and units of the prototype improves the operation of the most common (classical) dynamic indication circuit according to the polling method and at the same time gives a positive effect, expressed in improving the image quality by increasing its brightness.

Claims (1)

SUMMARY OF THE INVENTION A display device comprising a clock generator whose output is connected to the clock input of a polling unit, the outputs of the first group of which are connected to the control inputs of the display, and the outputs of the second group to address inputs of a memory unit, the outputs of which are connected to the first inputs elements And, and information and control inputs are respectively the information and control inputs of the device, the second inputs of the AND elements are connected to the outputs of the delay elements, and the outputs are connected to the information inputs of the indicator, characterized in that, in order to improve the quality of the image by increasing its brightness, the inputs of the delay elements are connected with corresponding outputs of the memory unit. 6N A 8 6 ALB L SI Fi Mr. Z