JPS58149091A - Bar graph type digital display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves the visual perception of a graphical digital display device.

Hereinafter, nine embodiments of the present invention will be specifically described.

Shape it. The pulse number counting circuit 6 calculates the time interval (for example, 100 m) of the reference time signal sent from the timing circuit 4.
5ec) Open the inner cage, count the pulse signals from the waveform shaping circuit 2, and calculate the enon rotation speed. The data comparison latch circuit 5 compares and stores the rotational speed signals from the pulse number counting circuit 3, and compares the stored rotational speed with the current rotational speed sent from the pulse number counting circuit 3. .

If the difference is 1001 or more, the rotation speed is memorized,
The rotation speed is outputted in synchronization with the signal from the timing circuit 4. Further, if the difference is less than 100 r-, the previous rotation speed is continued to be stored, and the rotation speed is outputted in synchronization with the signal from the timing circuit 4. Display data storage circuit 6
is used to store the number of revolutions (display data) and send a signal of the same number of revolutions to the control circuit 7. The half-graph type digital display 8 has a plurality of segments arranged in a band-like manner, and a driver 9 operated by a signal from the control circuit 7 lights up the segments according to the number of revolutions of the engine. Note that the valley segment is displayed as 100r-. The difference detection circuit 10 determines the difference between the rotation speed signal of the data comparison latch circuit 50 and the rotation speed data of the display data storage circuit B, and outputs this difference. The calculation circuit 11 uses the above difference 9 values to calculate the timing circuit 4.
Divide the reference time interval to find the segment lighting-on/off time interval, convert this time interval into a time signal by the signal of the time generation circuit 12, and rotate the display data stored in the display data storage circuit B for each of the above time intervals. Outputs a signal that increases or decreases the number by 100.

Then, the pulse signal from 1 ignition coil 1 is waveform-shaped and processed by a pulse number counting circuit to approximately 100 m5ec. The same data comparison launch circuit 5 stores the previous same rotation number\
If the difference is 1oorpa or more, this time the pulse number counting circuit 6
Memorizes the rotation speed sent from. When a timing signal every 100 m5ec is input from the timing circuit 4, the data comparison launch circuit 5 outputs the rotation speed signal, which is sent to the difference detection circuit 10. The difference detection circuit 10 determines the difference between the stored data 9, for example 1ooorIIO, of the display data storage circuit B and the rotational speed signal, and outputs the calculated value of this rotational speed difference to the calculation circuit 11. The calculation circuit 11 divides the display update time (output interval of the data comparison launch circuit), 100 m5ec, by the difference in the rotation speed display (4 segments 7) (400) P).

Calculate the segment lighting time interval (25 msec) and calculate 9
When the signal from the time generating circuit 12 reaches the above time value,
A 1-segment lighting increase signal, that is, a 100r-increase signal, is sent to the display data storage circuit B.

The circuit 6 is a control circuit 7. Via the driver 9, one additional segment of the half-graph type digital display 8 is lit. Then, when 25 m sec % has passed again, a signal is output in the same way and the segment is lit up by one, and this is repeated for 10 (1400 r- after 177+ aec has elapsed)
is displayed on the Hargraph type digital display 8. At the same time, 1400 rP is stored in the display data storage circuit B. Also, when the number of revolutions decreases by one, the display operates in the same way.
segment is turned off to indicate a decrease in rotational speed.

Therefore, as the number of revolutions increases or decreases, the segment to be increased or decreased is turned on or off at equal time intervals during the display update time interval, so that the rotation appears to change smoothly, which is preferable.

In the above embodiment, the rotation speed was described, but the same effect can be obtained by changing the vehicle speed.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. 1: Ignition coil, 6: Pulse number counting circuit. 5: Data comparison launch circuit. 6: Display data storage circuit. 8:Hargraph type digital display. 10: Difference detection circuit, 11゛Meter nose circuit cost I Hirowatari

Claims (1)

[Claims] In a half-rough digital display device formed by segments lined up in a band shape, when one display is updated, the difference between the previous display data and the current display data is divided by the display update time to display the segment's on/off time interval. A half-rough digital display device featuring