JPS6330636B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a driving device for a semiconductor display device including a plurality of semiconductor light emitting elements. In recent years, air conditioner control devices that use LSIs (Large Scale Integrated Circuits) and microcomputers store various input data such as the detected temperature of the controlled room, set temperature, and timer time, and then control the compressor motor and fan. It not only controls the start and stop of the motor, but also converts each data into a display signal and drives a display to display data. In this case, the output ports of the LSI or microcomputer are limited, and if a small and inexpensive one is used, priority is given to the control output port.
It has the disadvantage that there are not enough output ports for display, and it is not possible to display a wide variety of data.
In order to solve this problem, some devices have been designed to sequentially send out several types of display signals from a common output port in synchronization with the time-division scan signal.
The display on the display flickered, making it impossible to expect a stable display. The present invention has been made in view of the above-mentioned facts, and provides a display signal generator for a display signal generating device that emits a binary, several-bit display signal for a predetermined period of time in response to display data, and also emits a latch signal while the display signal is being generated. The latch signal is also supplied to the decoder device, and the decoder device outputs an output to one of the plurality of output terminals corresponding to the display signal, and maintains that state even after the display signal disappears. The device is characterized in that display data is displayed in stages on a semiconductor display equipped with a plurality of semiconductor light emitting elements in accordance with the output of the device. The device and the semiconductor display device are arranged side by side, and the display signal from the display signal generator is sent to each decoder device through a common data line, and the latch signal is sent through an individual data line, so that different display data is displayed on each display device. It is designed to display data in stages and to display a wide variety of data without flickering with a small number of output ports. An embodiment of the present invention will be described below as applied to an air conditioner control device using a microcomputer. In FIG. 1, 1 is a microcomputer, which has a power supply terminal B1 connected to a DC power supply 2, and clock terminals CL1 and CL2.
is connected to the oscillator 3 that determines the free running time of the microcomputer, and the input port I1 is connected to the room temperature detector 4.
The input ports I2 to I4 are connected to the operation setting circuit 5. Also, output port P
1 and P2 are individually connected to strobe terminals ST1 and ST2 of decoder devices 6 and 7 via output lines l1 and l2, respectively, and output ports P3 to P
6 is data terminal A to D of decoder devices 6 and 7
Output lines l3 to l common to and E to H
6 and output ports P7 to P1
0 is connected to a relay circuit 9 via a driver 8 having an inverting function. The room temperature detector 4 includes a room temperature sensor 10 and an A-D converter 11 that converts the sensor output into a binary digital signal.
The AD converter 11 is supplied with DC power. Operation setting circuit 5 is operation key 1
2, an up key 13, and a down key 14, one end of each key is connected to the DC power supply 2, and the other end is connected to the input ports I2 to I4 of the microcomputer 1, respectively. When the latch signal is input to the strobe terminal ST1, the decoder device 6 reads the binary, 4-bit display signals input to the data terminals A to D, and converts each display signal into a signal as shown in the truth table in Table 1. In response
An output signal of “0” is output to one of the 11 output terminals S1 to S11, and “1” is output to the remaining output terminals.
It outputs an output signal and maintains that state even after the display signal disappears. Note that the decoder device 6 actually receives display signals [0, 0, 0, 0] or [1,
1, 1, 1], 11 of which are used, and the power supply terminal B2 is connected to the DC power supply 2.

[Table] Reference numeral 15 is a semiconductor display for setting the temperature, and the display includes semiconductor light-emitting elements d1 to d consisting of 11 red-emitting light-emitting diodes connected in parallel.
11 and a resistor R connected in series to these semiconductor light emitting elements, and the other side of the resistor R is connected to a DC power supply 2.
The other sides of the light emitting elements d1 to d11 are connected to the output ports S1 to S11 of the decoder device 6, respectively. When the latch signal is input to the strobe terminal St2, the decoder device 7 reads the binary, 4-bit display signals input to the data terminals E to H, and converts each display signal into a signal as shown in the truth table in Table 2. correspondingly 9
“1” to one of the output terminals Q1 to Q9
It outputs an output signal of "0" to the remaining output terminals, and maintains this state even after the display signal disappears. Incidentally, the decoder device 7 actually has 16 output terminals and can correspond to 16 types of display signals from [0, 0, 0, 0] to [1, 1, 1, 1]. , power supply terminal B3 is connected to DC power supply 2.

[Table] 16 is a semiconductor display for room temperature, and this display has input terminals a1 to a9 connected to output terminals Q1 to Q9 of the decoder device 7, and outputs an inverted amplified output to output terminals 01 to 09. A semiconductor light emitting element g consisting of a driver 17 and nine green light emitting diodes connected in series in the forward direction.
1 to g9, connection points 18 to 25 of each light emitting element, and resistors 27 to 35 respectively connected between the other end 26 of the light emitting element g9 and the output terminals 01 to 09 of the driver 17,
The other end 36 of the light emitting element g1 is connected to the DC power supply 2. Note that the resistors 27 to 35 are arranged so that the resistance value decreases sequentially from the left, so that no matter how many light emitting elements g1 to g9 are sequentially lit from the left, the current flowing through each light emitting element is a constant current. so that
Load fluctuations are suppressed as much as possible. In particular, when green light emitting diodes are used as light emitting elements, the brightness will not be stable unless the current flowing through each diode is maintained at a constant current (for example, 20 mA), but this configuration prevents flickering of the light emitting elements. The DC power supply 2 can use a normally used constant voltage diode 38 (for example, withstand voltage of 30V, Zener voltage of 24 to 25V), which facilitates the design. The driver 17 is composed of nine sets of transistor circuits connected in Darlington as shown in FIG.
All 9 emitters are connected to the ground terminal ET,
The collectors of each set of transistors are connected to output terminals 01 to 09, respectively. The relay circuit 9 is composed of a control relay 39 for a compressor motor (not shown) and control relays 40 to 42 for selecting air volume of a fan motor (not shown), and one side of each control relay is connected to the DC power supply 2.
, and the other side is connected to output ports P7 to P10 of the microcomputer 1 via drivers 8, respectively. FIG. 3 shows the internal system of the microcomputer 1, in which the discrimination device 43 sequentially and repeatedly detects the presence or absence of signals at the input ports I2 to I4, detects the key operation of the operation setting circuit 5, and detects the operation key 12. The operation control device 44
The addition/subtraction device 4 outputs a discrimination output every time an operation of the up key 13 or the down key 14 is detected.
Issue an addition command or subtraction command to 5. The set temperature storage device 46 stores a set temperature of, for example, 27° C. as initial data, and when an addition command or subtraction command is input to the addition/subtraction device 45, the device calls it and transfers it after adding or subtracting a predetermined numerical value. and set temperature data for the “circulator” (usually much lower than room temperature) and 23℃.
Temperature data for each set point from 31°C to 31°C, and set temperature for “trial run” (normally much higher than room temperature)
Data is stored as 11 types of binary signals.
The room temperature storage device 47 takes in room temperature data from the room temperature detector 4 that comes in from the input port I1 every 10 seconds, for example, and when data different from what has already been input is detected, stores the new data.
When the first discrimination output is output from the discrimination device 43, the thermo device 48 receives an operation command from the operation control device 44 and starts operating, and when the second discrimination output is output, a stop command is input and the thermo device 48 starts operating. is stopped, and this is repeated for the third and subsequent pieces. Then, during operation, the set temperature in the storage devices 46 and 47 is compared with the room temperature data. For example, when the set temperature is 27°C, the room temperature is 26.5°C.
A signal of "0" at °C and "1" at 27.5 °C is output from output port P7 to control the start/stop of the compressor motor.
A signal of "1" or "0" is output from P8 to P10 to appropriately control the air volume of the fan motor. The display signal generator 49 reads the set temperature and room temperature data from the storage devices 46 and 47 alternately and at predetermined intervals.
Correspondingly, a binary, 4-bit display signal shown in Table 1 or Table 2 is output from output ports P3 to P6 for a predetermined period of time, and a latch signal is output from output port P1 or P2 while this display signal is being generated. . For example, as shown in Figure 4, the set temperature display signal of 27°C is output from output ports P3 to P6 as a to d corresponding to [0, 1, 1, 0], and the latch signal is output from output port P1. It is served as e. The microcomputer 1 is always in operation while DC power is supplied, and detects the operation of each key, inputs a room temperature signal, stores input data, and generates a display signal. Now, it is assumed that the storage device 46 stores the set temperature data as 27°C, the storage device 47 stores the room temperature data as 32°C, and the output ports P7 to P1
It is assumed that the air conditioner is in a stopped state in which all 0 signals are "0". At this time, the display signal generator 49 of the microcomputer 1 outputs [0,
1, 1, 0], and also generates a latch signal of "1" from the output port P1 during this period. Decoder device 6 is a strobe terminal
This latch signal is input to St1, and as shown by the arrow in Fig. 4e, the display signals input to data terminals A to D are read at the falling edge of the latch signal, and in this case, only the output terminal S6 outputs "0". This state is maintained even after the display signal disappears. Therefore, in the semiconductor display 15, only the light emitting element d6 has a resistance B.
Then, electricity is applied through the output terminal S6 to light up in red, and the set temperature data is displayed as shown in FIG. 5a. Note that the same display signal is input to the data terminals E to H of the decoder device 7, but the strobe terminal
Since the latch signal does not enter St2, there is no effect on the output terminal. Next, the display signal generator 49 outputs the output port P3.
A signal of [1, 0, 1, 0] is output to P6, and a signal of "1" is output from the output port P2 while this signal is being generated, and the decoder device 7 then outputs a signal of "1" from the output port P2 at the falling edge of the signal of the strobe terminal St2. It reads the E to H signals and maintains a state where only the output terminal Q9 is "1". Therefore, in the semiconductor display 16, the transistors TR9 and TR19 of the driver 17 are turned on by the "1" input to the input terminal a9, and the output terminal 09 outputs "0", so that the light emitting elements g1 to g9 have the lowest resistance value. resistance 35
All of them are energized via the , and are lit in green with stable brightness, and room temperature data is displayed as shown in FIG. 5b. Note that in this case, there is no change in the decoder device 6. In this way, the display signal generator 49 alternately supplies latch signals and display signals to the decoder devices 6 and 7 at appropriate intervals to operate them, and the semiconductor displays 15 and 16 display data on the set temperature and room temperature. . Furthermore, since the display devices 15 and 16 hold their outputs even when the decoder devices 6 and 7 do not receive a signal, they are always energized and do not flicker. When the operation key 12 is operated once in this state, the thermo device 48 is activated and all "1" outputs are output to the output ports P7 to P10, and the control relays 39 to 42 are turned on, so that the compressor motor is operated. At the same time, the fan motor operates with a high air volume, and the air conditioner performs powerful cooling operation. As a result, the room temperature drops rapidly and the room temperature detector 1
0 detects this, the room temperature data in the storage device 47 becomes smaller. Then, as the room temperature becomes 30°C (strictly speaking, 30.5°C to 31.5°C) and 29°C to 27°C, the thermo device 48 changes the signals at the output ports P8 to P10 so that the air volume of the fan motor decreases, and the display signal The generator 49 generates a latched signal at the output port P2 as well as a decoder device 7 from the output ports P3 to P6 according to Table 2.
Since a display signal that follows the change in room temperature is sent to the room temperature, the output terminal of the decoder device 7 that outputs "1" moves to the left, and the light emitting elements of the semiconductor display 16 disappear one after another from the right. Furthermore, the room temperature is 26.5℃
When the temperature drops below this, the thermo device 48 outputs a "0" output to the output port P7, stops the compressor motor, and suspends the cooling operation. At this time, the display signal generator 49 generates a latch signal from the output port P2 as well as a latch signal from the output ports P3 to P6.
1], the decoder device 7 issues signals of "1" and "0" to the output terminal Q4, and the driver 17 issues signals of "1" and "0" to the output terminal 04, respectively. or g
4 is energized through the resistor 30, and the room temperature of 26° C. is displayed as shown in FIG. In this case as well, the fifth
Lights up at the same brightness as in Figure b. As a result, when the room temperature rises and exceeds 27.5℃,
The thermo device 48 restarts the compressor motor, and the display signal generator 49 causes the semiconductor display 16 to display a room temperature of 28° C. as shown in FIG.
It goes without saying that the room temperature will be displayed at 27°C during this time. By repeating this process, the room temperature will be 27℃.
(26.5℃ to 27.5℃), maintaining precise room temperature control. Also, in this state, the semiconductor display 16
By lighting up the semiconductor light-emitting elements around the set temperature of 27°C, it is possible to check whether the air conditioner is operating normally. Furthermore, the lighting display on the semiconductor display 16 is made so that the microcomputer 1 receives the room temperature signal from the room temperature detector 4 at predetermined intervals (for example, 10 seconds).
There is no hunting from side to side at a dizzying pace near the boundary value of room temperature (for example, 26.5℃ or 27.5℃).
Since the resistance values of the resistors 27 to 35 are set from large to small in order from the left, the brightness will not change depending on the number of lights lit and will not be difficult to see. When the discrimination device 43 of the microcomputer 1 detects the second operation of the operation key 12, the thermo device 48 stops operating, the compressor motor and the fan motor completely stop, and the air conditioner comes to a stopped state. Note that even when the air conditioner is in operation or stopped, the addition/subtraction device 45 operates every time the up key 13 or down key 14 is operated, and the set temperature data in the storage device 46 is updated one rank at a time. Increase or decrease. Therefore, the display signal generator 49 selects a display signal corresponding to the data from among 11 types based on Table 1, generates it from output ports P3 to P6, and outputs a latch signal from output port P1 to output it to the decoder. Controls the output terminal of the device 6. Therefore, the "0" output from the output terminal moves left and right one by one, the lighting of the light emitting elements of the semiconductor display 15 moves in conjunction with this, and the set temperature data can be confirmed by the lighting position of the light emitting element. In addition, in the above-mentioned embodiment, the semiconductor display device 15,
16 is placed in parallel with the display signal generation device 49 of the microcomputer 1 along with the decoder devices 6 and 7, but it is also possible to provide three or more in parallel, and in addition to displaying the temperature such as the set temperature and room temperature, the timer time can also be displayed. It can also be used to display data such as As described above, the present invention provides two functions corresponding to display data.
A display signal generating device that emits a forward, several-bit display signal for a predetermined period of time and also generates a latch signal during the generation period of the display signal, reads the display signal when the latch signal is input from the device, and outputs a plurality of output terminals. A decoder device that outputs a signal to one output terminal corresponding to a display signal and maintains the state thereof, and a semiconductor display device that includes a plurality of semiconductor light emitting elements that perform lighting display in stages according to the output of the device. Since the semiconductor display is composed of By sending a display signal to each decoder device through an output line and a latch signal through an individual output line, different display data can be displayed on each semiconductor display without flickering, and the display signal generator can be When configured with a computer, the output port is saved and a small and inexpensive microcomputer can be used to display a large amount of data and perform various complex controls.

[Brief explanation of the drawing]

The figures show an example of a control device for an air conditioner incorporating the device of the present invention. Fig. 1 is an electric circuit diagram of the control device, and Fig. 2 is a diagram of the driver of the semiconductor display used in Fig. 1. Detailed circuit diagram, Figure 3 is 1
A block diagram showing the internal system of the microcomputer used in the figure, and FIGS. 4 to 7 are explanatory diagrams of the operation of the apparatus of the present invention. 1... Microcomputer, 6, 7... Decoder device, 15, 16... Semiconductor display device, 49... Display signal generator, l1 to l6... Output line, d1
to d11, g1 to g9...semiconductor light emitting elements.

Claims (1)

[Claims] 1. In a semiconductor display driving device that is equipped with a display for each data and that lights up a plurality of semiconductor light emitting elements in response to detected temperature data, set temperature data, etc., and displays a plurality of data simultaneously on each display, Each data has an output port that outputs a latch signal corresponding to the data, and the number of common output ports that output a binary, several-bit display signal corresponding to each data is equal to the number of bits. a display signal generator that outputs a latch signal corresponding to the data of the display signal when the display signal is output, and an output that connects the display signal to the common output port when the latch signal is input. input via a line, and output a lighting output of a semiconductor light emitting element corresponding to the display signal to a display device;
A driving device for a semiconductor display device, characterized in that a decoder device for holding this lighting output is provided for each data.