JPH0323847B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device using two-color light emitting diodes.

With a graphic equalizer that sets the amount of tone up or down in a specific frequency band by the position of the slider on a sliding volume, the current position of the slider is in the center, or it can be offset to the left or right (up or down). It is convenient to display whether there are any. The present invention is intended to meet such demands, and its features include a current switcher in which the current flowing through the first output terminal and the second output terminal changes depending on the position of the slider; a two-color light-emitting diode having a pair of light-emitting diodes of different light emitting colors connected to a first output terminal and a second output terminal, respectively, and driven by currents flowing through the first output terminal and the second output terminal, respectively; The point is to have the following. This will be explained in detail below with reference to the illustrated embodiments.

FIG. 1 is a circuit diagram showing one embodiment of the present invention.
0 is a sliding current switch, and 20 is a two-color light emitting diode. The current switch 10 has a slider 11 in the center, and the slider 11 moves leftward (arrow L) or rightward (arrow R). 12 is a conductively connected input terminal of the slider 11, which is connected to the power supply +B. 13 is a left output terminal, and a conductor 14 is provided from here to near the center. 15 is a right output terminal, and a conductor 16 is provided from here to near the center. Two color light emitting diode 2
0 is a package in which light emitting diodes 21 and 22 of different luminescent colors are housed. The light emitting diode 21 is driven by the current flowing from the terminal 15 through the current limiting resistor _R1 , and the light emitting diode 2
2 is driven by the current flowing from the terminal 13 through the current limiting resistor R ₂ .

The circuits 14 and 16 of this example are conductors and are characterized in that their tips are long enough not to reach the center. Therefore, when the slider 11 is at the center position as shown in the figure, the slider 11 does not come into contact with any of the conductors 14, 16, so the light emitting diodes 21, 22 are both in the off state.
Then, when the slider 11 is moved in the R direction, the slider 11 comes into contact with the conductor 16 and +B-12-11-16
A current flows through the path of −15−R ₁ −21−GND, and the light emitting diode 21 is driven. Conversely, when the slider 11 is moved from the center position in the L direction, the slider 11 comes into contact with the conductor 14, so +B-12-11-14-13
A current flows through the path -R ₂ -22-GND, and the light emitting diode 22 is driven. If the emitting diode 21 emits red light, for example, and the light emitting diode 22 emits green light, for example, the slider 11 emits green when it is deviated to the left, red when it is deviated to the right, and the center position. If it is, the display will turn off the light.

FIG. 2 is a main circuit diagram showing another embodiment of the present invention. In the circuit of this example, the ends of the conductors 14 and 16 in the current switch 10 of FIG. 1 are extended so that they slightly overlap at the center. In this way, when the slider 11 is deviated to the left or right, it is the same as shown in FIG. The light emitting diode 20 displays the center position in a mixed color of red and green.

FIG. 3 is a main circuit diagram showing a different embodiment of the present invention. In this example, the conductors 14 and 16 in FIG. 1 are replaced with resistors 17 and 18, and their tips are extended to the ends. In this way, the light emitting diodes 21 and 22 have constant current.
I _R and I _L flow. The values of these currents I _R and I _L are
Resistance value R _R between 1 and terminal 15 and slider 1
Since it is defined by the resistance value R _L between 1 and the terminal 13, it changes depending on the position of the slider 11.
Qualitatively, as the slider 11 moves to the left (L) direction, the current I _L increases (I _R decreases), and conversely, as the slider 11 moves to the right (R) direction, the current I _R increases (I _L decreases). Therefore, the emitted light color of the two-color light emitting diode 20 is close to green when the slider 11 is located at the leftmost position, and as the slider 11 is moved to the right, green decreases and red increases. It exhibits a color change, becoming closer to red when moved to the far right.

Note that if the circuit configuration shown in FIG. 1 is used in the case where the light emitting diodes 21 and 22 are of the same color and the light emitting shapes are a right-pointing triangle and a left-pointing triangle, that is, a so-called arrow display LED, the slider 11 is at the center position. The light is turned off at , a leftward triangular display is displayed when the shifter is shifted to the left, a rightward triangular display is displayed when the shifter is rightward, and the position of the slider 11 is also visually displayed.

As described above, according to the present invention, the slider position of the slide type current switch is displayed depending on the light emission form of the two-color light emitting diode, so it can be set by linking it with the slide volume of the graphic equalizer, for example. It has the advantage of being able to visually display whether the condition is tone-up, tone-down, or even flat.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
3 and 3 are principal circuit diagrams showing different embodiments of the present invention. In the figure, 10 is a sliding current switch, 11 is a slider, 13 is a left output terminal, 15 is a right output terminal, 2
0 is a two-color light emitting diode, and 21 and 22 are light emitting diodes that emit light of different colors.

Claims (1)

[Claims] 1. A current switch that changes the current flowing through a first output terminal and a second output terminal depending on the position of a slider; 1. A display device comprising: a first output terminal; and a two-color light emitting diode having a pair of light emitting diodes emitting light of different colors, each driven by a current flowing through a second output terminal. 2. When the slider is in the center position, current is interrupted from both the first output terminal and the second output terminal,
When moving from the center of the slider in the first direction,
A current flows only through the first output terminal, and when the slider moves from the center in a second direction opposite to the first direction, a current flows only through the second output terminal. Display device according to scope 1. 3 When the slider is in the center position, current flows from both the first output terminal and the second output terminal, and when the slider moves from the center in the first direction, current flows only in the first output terminal. The display according to claim 1, wherein when a current flows and moves from the center of the slider in a second direction opposite to the first direction, the current flows only to the second output terminal. Device. 4. The display device according to claim 1, wherein the movement of the slider causes the current flowing through the first output terminal and the current flowing through the second output terminal to increase or decrease in opposite directions.