JPS62150387A - Multicolor display control circuit - 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 [Field of Industrial Application] The present invention relates to a multicolor light control circuit, and particularly to a multicolor display control circuit that can display eight or more colors using three types of light emitting diodes.

[Conventional technology]

Conventional multicolor display control circuits use three types of monochromatic light emitting elements, red, yellow, and green, such as light emitting diodes, as a set, and the display control circuit turns on and off the light emitting diodes of each color, effectively displaying four colors. It was displayed in more than one color.

[Problem that the invention seeks to solve]

However, such conventional multicolor display control circuits
Since it did not have a means to control only the lighting and extinguishing of the light emitting diodes of each color and the brightness when the lights were turned on, there was a drawback that only a maximum of 2"-1=7 colors could be displayed.

[Failure to solve the problem]

The multicolor display control circuit of the present invention includes a basic clock generation circuit, a timing generation circuit that periodically generates one lighting timing signal and a plurality of lights-out timing signals, and one timing signal selected from among the plurality of lights-out timing signals for each light emitting diode. and a flip-flop circuit that turns on and off the respective light emitting diodes according to the lighting timing signal and the lighting-off timing signal.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the multicolor display control circuit shown in FIG. 1, a basic clock generation (b) path 1 generates a square wave clock with a frequency of 1 kHz. The clock generated here is input to the timing generation circuit 2, which generates eight types of timing signals r.
p, , T, are created. In other words, 1 in 8 clocks
Let the display cycle be the first clock, T6 the second clock, and T the eighth clock. This situation is shown in FIG.

The reset priority type R-8 flip 70 tube circuit 3 controls blinking of the red light emitting diode. When the reset priority rL-S flip and flop circuit 3 is in the set state, the red light emitting diode 4 is turned on, and when it is in the reset state, the red light emitting diode 4 is turned off. The reset priority type 1t-S flip-flop circuit 3 is set by the timing signal T, and the timing selected by the z'11 lamp timing selection circuit 5, for example, the timing signal T.

will be reset. That is, the red light emitting diode 4 is
It lights up at timing T and goes out at the selected timing. (Does not light up if both are T) Reset priority type 1
The 1-8 flip-flop circuit 9 and the light-off timing selection circuit 8.11 each have a yellow light emitting diode 7,
This is a yellow, peripheral circuit corresponding to the green light emitting diode 10.

It is now assumed that the light-off timing selection circuits 5, 8, 11 select the light-off timing signals T, , T, , T, as shown by broken lines in FIG.

The red light emitting diode 4, the yellow light emitting diode 7, and the green light emitting diode 10 are periodically turned on and off as shown in FIG. However, the period is l kHz÷8
:125Hz, which is fast enough for human vision, so it appears to be lit continuously. In addition, the brightness of each red, yellow, and green light emitting diode is proportional to the length of lighting time, and is 2:
The ratio will be 4:6.

In the end, to humans, it appears as if a mixture of the three colors red, yellow, and green in a ratio of 2:4:6 is lit continuously.

〔Effect of the invention〕

The multicolor display control circuit of the present invention generates a plurality of light-emitting diode turn-off timing signals, and independently selects red, yellow, and green turn-off timing signals within one display cycle according to the color desired to be displayed. For example, if there are 8 types of lights-out timing signals, 8X8X8-1=51
This has the effect of allowing display in one color.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a time chart of main signals in the embodiment shown in FIG. 19111. Basic clock generation circuit, 2... Timing signal generation circuit, 3.6.9... Reset priority type R-8 flip-flop circuit, 4...
Red light emitting diode, 5, 8.11...Light-off timing selection circuit, 7...Yellow light emitting diode, 10...Green light emitting diode, 12.13.
14... Light-off timing designation signal. Agent: Patent Attorney Uchihara Jinunpo

Claims (1)

[Claims] A basic clock generation circuit that generates a basic block, a timing generation circuit that generates one lighting timing signal and a plurality of lights-off timing signals based on the basic clock, and a plurality of lights-off timing signals based on an external lights-off timing designation signal. A plurality of light-off timing selection circuits each capable of independently selecting one light-off timing signal from among the light-off timing signals, and a plurality of monochromatic light emitting elements each emitting light of a different color from the light-on timing to the selected light-off timing. Features a multicolor display control circuit.