JPH0119153B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display control device that controls a display device such as an LED (light emitting diode) array that displays the input/output status of a plant on a printed wiring board.

Displaying the input and output status of printed wiring boards that control the input of operating status signals and switch signals from the plant and the output to the plant is necessary for configuring and maintaining the system. .

Currently, printed wiring boards that control plants are becoming more densely packaged, and a single printed wiring board is now able to process a large number of input/output points. Therefore, in such a printed wiring board, it is extremely difficult to provide a display for each input/output point because the mounting space on the printed wiring board is limited.
For this reason, in the past, efforts have been made to achieve high-density mounting on printed wiring boards using LED arrays, etc., but even if LED arrays are used, it is still not sufficient when the number of input/output points is enormous. Ta.

This invention was made in view of the above points,
A large amount of information can be displayed with a small number of display elements, the display section is made compact, and the display area is suitable for use in printed wiring boards that display a large amount of information and have a small display space.
It is an object of the present invention to provide a display control device that can reliably display even if a large amount of information occurs at the same time.

An embodiment of the present invention will be described below with reference to the drawings. In this example, the total number of pieces of information to be displayed is 8 pieces, divided into two groups of 4 pieces each, and the first group of information will be described as information group A, and the second group of information will be described as information group B. do.

In the figure, 11A is an information generating section that generates the above information group A, 11B is an information generating section that generates the above information group B, and the information group A from the information generating section 11A is transmitted to each of the AND circuits 12 ₁ to 12 ₄ . The information group B from the information generating section 11B is supplied to one input terminal of each of the AND circuits 13 ₁ to 13 ₄ . Further, 14 is a switching signal generating circuit, which generates a rectangular wave with a period of several seconds to several minutes, and the rectangular wave is applied to the other input terminal of each of the AND circuits 12 ₁ to 12 ₄ . Inverter 1
5, the waveform is inverted and the waveform is inverted, and the above AND circuit 1
3 ₁ to 13 ₄ are respectively supplied to the other input terminal. Also, 16 is an LED array, and this LED array 16 has 4 LEDs in this case.
elements L ₁ to _{L 4} and an information group identification LED element LA for distinguishing between information group A and information group B;
It is composed of LB. Below, the above LED element
L ₁ to _{L 4} are called information display elements L ₁ to _{L 4} , and are LED elements.
LA and LB are called information group identification elements LA and LB.

By the way, the information display elements _L1 to _L4 are provided with AND circuits ₁₂₁ to ₁₂₄ or AND circuits ₁₃₁ to 1.
3 _{and 4} are selectively supplied, and the outputs from the switching signal generation circuit 14 are alternately supplied to the information group identification elements LA and LB.

Next, the operation of the present invention configured as described above will be explained. From the switching signal generation circuit 14 for several seconds
A rectangular wave with a period of several minutes is generated, and this rectangular wave is passed through the AND circuits 12 ₁ to 12 ₄ and the information group identification element.
It is supplied as is to the LA as a gate open control signal and an information group identification signal, and the AND circuit 1
3 ₁ to 13 ₄ and the information group identification element LB, the waveform is inverted by the inverter 15 and the reverse waveform is supplied as the gate open control signal and the information group identification signal. Therefore, these information group identification elements LA and LB are turned on alternately every few seconds to several minutes by the rectangular wave from the switching signal generating circuit 14.

On the other hand, the information group A from the information generator 11A indicates that the gates of the AND circuits 12 ₁ to 12 ₄ are in the open state when the switching signal generating circuit 14 generates a gate open control signal having a rectangular wave of "1" level. Therefore, it is output through these AND circuits 12 ₁ to 12 ₄ ,
The information display elements L ₁ to _{L 4} are displayed by lighting. At this time, upon receiving the information group identification signal from the switching generation circuit 14, the information group identification element LA side lights up. In addition, the information group B from the information generating section 11B is obtained by inverting the "0" level of the rectangular wave output from the switching signal generating circuit 14 by the inverter 15 and turning it into a gate open control signal, which is then sent to the AND circuits 13 ₁ to 13 _{4 .} Since the gates of are in an open state, the signal is outputted through these AND circuits 13 ₁ to 13 ₄ and causes the information display elements L ₁ to L ₄ to be displayed by lighting. At this time, as a matter of course, the information group identification element LB side lights up.

Therefore, depending on which of the information group identification elements LA and LB is lit, the information display element at that time
It is possible to immediately know whether the lighting of L ₁ to _{L 4} is information group A or information group B.

By doing this, although there are eight information groups A and B in total, the display elements of the LED array 16 are divided into four information display elements L ₁ to L ₄ and two
A total of six information group identification elements LA and LB are required,
The LED array 16 can be made small,
The installation space on the printed wiring board can be reduced. In the case of this example, the number of information groups A and B is extremely small, 8 in total, so it does not have the effect of significantly reducing the number of display elements. However, when the number of information groups is several hundred, it is possible to reduce the number of display elements. It can be significantly reduced and is extremely effective. Further, by dividing the switching signal into three or more, the number of display elements can be further reduced.

As explained above, according to the present invention, when there are a large number of information points, the information points are divided into a plurality of pieces to form a plurality of information generation parts, and the display part is formed from the plurality of information generation parts. A number of information display elements corresponding to the number of information signals and a number of identification display elements corresponding to the number of information generation parts are provided, and selection of the identification display elements and the information generation parts is performed in a synchronized state. This makes it possible to display a large amount of information with a small number of display elements, significantly downsizing the display section, reducing the installation space for the display section, and ensuring that even when a large amount of information is input at the same time, it is possible to display a large amount of information. A display control device capable of displaying images can be provided.

[Brief explanation of drawings]

The figure is a configuration diagram showing one implementation of the present invention. 11A, 11B...information generating section, 12 ₁ to 12 ₄ ,
13 ₁ to 13 ₄ ... AND circuit, 14 ... switching signal generation circuit, 15 ... inverter, 16 ... LED array.

Claims (1)

[Claims] 1. A plurality of information generation sections that divide a plurality of information points into groups each having an equal number of points and generate information signals, and a switching signal generation circuit that alternately generates a number of switching signals equal to the number of information generation sections; It is provided corresponding to each switching signal generated from this switching signal generation circuit, and when it receives these switching signals as a gate opening control signal, it passes the information signal belonging to the information generating section that corresponds to the switching signal. ,
A plurality of gates, each having a number of gate circuits equal to the number of information signals of one information generation section, and whose output sides are commonly connected so that the number is equal to the number of information signals of one information generation section. a plurality of information group identification display elements that light up upon receiving each switching signal generated from the switching signal generation circuit individually as an information group identification signal, and each gate circuit group through the common connection line. A display control device comprising: a display section comprising a plurality of information display elements that light up in response to individually receiving input information signals for each of the information generating sections.