JPH0756528A - Display device - Google Patents

Abstract

PURPOSE:To provide a display device capable of changing display colors on a light emitting surface easily and in various ways and improving remote visibility without any structural changes when display colors are changed. CONSTITUTION:A lighting control signal is sent by a driver control circuit 12 to a driver 13 so as to alternately light, for example, red and green LED 1 and 2, to be dynamically controlled at a high frequency based on a control signal from a pulse width control circuit 14 for controlling the frequency and pulse width of a lighting signal. Then, by the lighting signal from the driver 13, the control of the LED having a longer lighting period is intensified because of an after image phenomenon and the display colors on the light emitting surface are made variable by its duty ratio. For example, a blue LED 11 is turned OFF and the red and green LED 1 and 2 are turned ON by the duty ratio 50%, the display color on the light emitting surface via a filter 3 is made orange and by shortening the pulse width of the red LED 1 and lengthening that of the green LED 2 the emitted light is made yellow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device capable of arbitrarily changing a display color of a light emitting surface by combining light emitting diodes having different light emitting colors.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a conventional display device. In the figure, 1 and 2 are red and green light emitting diodes (hereinafter, light emitting diodes are referred to as LEDs), and 3 is the above 2
The red and green LEDs 1 and 2 are filters used to make one LED 1 and 2 one light source. The red and green LEDs 1 and 2 are supplied to the LED based on a control signal from a driver control circuit 4 which sends a control signal for turning the LED on and off. Lighting is performed based on the lighting signal from the driver 5 that generates the lighting signal.

Reference numeral 6 is a current variable circuit which is provided between the driver 5 and the red and green LEDs 1 and 2 and which is, for example, an electronic trimmer having a variable resistance value. The resistance value is variably controlled based on the control signal from the variable control circuit 7, and the red and green LEs are
By changing the current values of the direct currents flowing to D1 and D2, respectively, the brightness of the red and green LEDs 1 and 2 is changed to change the display color of the light emitting surface.

Next, the operation of the above configuration will be described. Red and green L based on the lighting signal sent from the driver 5 based on the control signal from the driver control circuit 4.
ED1 and 2 are lit. At this time, the current variable circuit 6 whose resistance value is variably controlled on the basis of the control signal from the current variable control circuit 7 changes the current values of the direct currents flowing to the red and green LEDs 1 and 2, respectively. The brightness of the LEDs 1 and 2 changes, and the display color of the light emitting surface changes.

For example, if the ratio of the current value flowing through the red LED 1 is increased and the ratio of the current value flowing through the green LED 2 is decreased, the light emitting surface becomes red,
If the ratio of the current values is reversed, the light emitting surface becomes green, and if the ratio of the current values is the same, it becomes orange.

FIG. 5 shows a display device used in a controller for a control center (hereinafter referred to as a C / C controller) for controlling and protecting a power unit such as a motor at the end of a plant facility, for example. Is. In the figure, 8 is a display panel of a C / C controller, and 9
a, 9b and 9c are red, green and orange LEDs,
Reference numerals 10a, 10b, and 10c are name plates for facility operation, stoppage, and failure, and are configured to display a red LED 9a during facility operation, a green LED 9b during stoppage, and an orange LED 9c during stoppage, respectively.

[0007]

Since the conventional display device is constructed as described above, it has the following problems. (1) For example, in the display device shown in FIG. 4, in order to make the emission color variable, a circuit configuration such as a current variable circuit 6 and a current variable control circuit 7 for controlling the value of the current flowing through the LED is required. Also, the display color on the light emitting surface is a combination of the shades of the red and green LEDs 1 and 2,
If the red and green LEDs 1 and 2 do not emit light with a certain level of brightness, a uniform color cannot be obtained on the light emitting surface, and the emission colors are limited to three colors of red, green and orange.
If you narrow down the current that flows in, it will not be possible to ensure a certain brightness, there will be bright and dark areas on the light emitting surface, unevenness will not be obtained and uniform color cannot be obtained on the light emitting surface, for example red and orange, There was a drawback that it was difficult to obtain a neutral color between green and orange.

(2) Further, for example, in the display device shown in FIG. 5, three LEDs are required to display three colors, and when changing the specification of the display color, for example, green is in operation. When it was desired to change the color display while the red color was stopped, the positions of the LEDs had to be exchanged, or the display name plate had to be changed.

The present invention has been made in order to solve the above-mentioned problems of the conventional example, and the display color of the light emitting surface can be easily and variously changed, and the visibility from a distance can be improved. An object of the present invention is to obtain a display device which can be enhanced and can cope with a change in display color without changing the hardware.

[0010]

A display device according to claim 1 of the present invention is a display device in which a display color of a light emitting surface is changed by lighting control of a plurality of light emitting diodes having different light emission colors. Pulse control means for controlling the frequency and pulse width of the lighting signal, and driver control means for dynamically lighting control the lighting signal to each light emitting diode based on the control signal. .

A display device according to a second aspect is a display device in which a display color of a light emitting surface is varied by controlling lighting of a plurality of light emitting diodes having different light emission colors, and the light emitting diodes include red, green and blue. A pulse control means for controlling the frequency and pulse width of the lighting signal to each of the light emitting diodes and a driver control for dynamically lighting the lighting signal to each of the light emitting diodes based on the control signal And means.

According to a third aspect of the present invention, in the display device in which the display color of the light emitting surface is changed by controlling the lighting of a plurality of light emitting diodes having different light emission colors, the display device is based on the status signal of the operating state of the monitored equipment. Pulse control means for controlling the frequency and pulse width of the lighting signal to each of the light emitting diodes to emit any color according to the operating state,
A driver control means for dynamically controlling the lighting signal to each of the light emitting diodes based on the control signal is provided.

Further, according to a fourth aspect of the present invention, in the display device in which the display color of the light emitting surface is changed by controlling the lighting of a plurality of light emitting diodes having different light emission colors, the failure factor thereof is based on the failure signal of the monitored equipment. Pulse control means for controlling the frequency and pulse width of the lighting signal to each of the light emitting diodes in order to alternately light up different colors or control the blinking of a single color according to, and to each of the light emitting diodes based on the control signal. A driver control means for dynamically controlling lighting of a lighting signal is provided.

[0014]

In the display device according to the first aspect of the present invention, the pulse control means sends a control signal for controlling the frequency and pulse width of the lighting signal to each light emitting diode, and the driver control means sends the control signal. The display color is arbitrarily changed by dynamically controlling the lighting signal to each light emitting diode based on the above.

According to a second aspect of the present invention, in the display device according to the first aspect, all display colors are obtained by providing light-emitting diodes of three primary colors of red, green and blue as the light-emitting diodes. .

Further, in the display device according to the third aspect, the pulse control means causes each light emitting diode to emit light in an arbitrary color in accordance with the operating state of the equipment to be monitored based on the operating state signal. By controlling the frequency and pulse width of the lighting signal, it is possible to determine the operating state from the display color.

Further, in the display device according to the fourth aspect, each of the pulse control means is adapted to alternately light up different colors or blink a single color in accordance with the failure factor of the monitored equipment based on the failure signal of the equipment to be monitored. By controlling the frequency and pulse width of the lighting signal to the light emitting diode, it is possible to determine the failure factor from the display color and display state.

[0018]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram illustrating a display device according to the first embodiment. In FIG. 1A, 1 to 3 indicate the same parts as those of the conventional example shown in FIG. 4, 1 and 2 indicate red and green LEDs,
3 is a filter, and as a new configuration, 11 is a blue LED, and an arbitrary color is displayed by arbitrarily controlling the lighting states of the red, green and blue LEDs 1, 2, 11 of these three primary colors. I am trying.

Further, 12 is a driver control circuit, 13 is a driver, and 14 is a pulse control circuit, and the red, green and blue LEDs 1, 2 and 11 send out a control signal for controlling the dynamic lighting of the LEDs. The lighting is performed based on the lighting signal from the driver 5 which generates the lighting signal based on the control signal from the control signal from the pulse control circuit 14. At this time, the pulse control circuit 14 changes the frequency of the lighting signal to the LED to be dynamically controlled and A control signal for controlling the pulse width is sent to the driver control circuit 12. The display device having the configuration shown in FIG. 1 (a) is provided such that the display unit 15 is located on the device panel shown in FIG. 1 (b). , Stop, and failure are displayed.

Next, the operation of the above configuration will be described. The driver control circuit 1 is based on a control signal from the pulse control circuit 14 that controls the frequency and pulse width of the lighting signal.
The driver 2 sends a lighting control signal to the driver 13 in order to alternately light the red and green LEDs 1 and 2 to be dynamically controlled at high frequency. Then, the driver 1
Depending on the lighting signal from 3
The color of the ED becomes stronger due to the afterimage phenomenon, and the display color of the light emitting surface is changed by changing the duty ratio.

For example, as shown in FIG. 2A, blue L
When the ED 11 is turned off and the red and green LEDs 1 and 2 are lit at a duty ratio of 50%, the emission color on the emission surface through the filter 3 becomes orange, and FIG.
As shown in (b), the emission color can be made yellow by increasing the pulse width of the green LED 2 while shortening the pulse width of the red LED 1. Further, the emission color can be changed by controlling the frequency of the lighting signal.

In this way, by controlling the frequency and pulse width of the lighting signal to each LED, it is possible to easily and variously change the display color of the light emitting surface. Further, since the light emission color is controlled by dynamic lighting, the light emission efficiency is better than that of the conventional light emission color control by simultaneous lighting, and a plurality of LEDs are collectively surface-lit. Therefore, compared with the conventional example shown in FIG. 5, it is possible to increase the lighting area and enhance the visibility from a distance.

Example 2. Next, FIG. 3 shows a display example according to an application example of the display device of the C / C controller. The display device of the C / C controller is provided with the configuration shown in FIG. Control the frequency and pulse width of the lighting signal to each light emitting diode to emit any color according to the operating state of the operating state of the monitored equipment (not shown) given from
The frequency and pulse width of the lighting signal to each light emitting diode are controlled so that different colors are alternately turned on or off according to the failure factor based on the failure signal of the monitored equipment (not shown) given from the outside. By controlling
The operating state can be determined from the display color, and the failure factor can be determined from the display color and the display state.

For example, when an alarm is issued by a failure in the ON state by displaying red during operation, green during stop, and orange for failure, as shown in FIG. 3A, red is displayed. 3 and orange are alternately lit, and when a warning is issued by a trip, as shown in FIG. 3B, green and orange are lit alternately, and in the case of a serious failure, FIG.
As shown in FIG. 3C, by making the orange lighting period shown in FIG. 3B longer than that of green and alternately lighting the same, various states can be displayed on one display device. It should be noted that when the display is performed using only a single color LED, it may blink.

Further, in this case, the display device may be provided with the structure shown in FIG. 1, and since the LEDs of three colors are collectively turned on for surface lighting, the lighting area is larger than that of the conventional example shown in FIG. To increase visibility from afar,
Moreover, it is possible to deal with the change of the display color without changing the hardware.

Example 3. In the first embodiment described above, in the dynamic lighting control of the lighting signals of the LEDs of a plurality of colors, a configuration example including the driver control circuit 12 and the pulse control circuit 14 as means for controlling the frequency and pulse width of the lighting signal is described. As described above, it is needless to say that a single control means can be provided by using a CPU such as a microcomputer, and an emission time of an emission color can be programmed to display an arbitrary display color.

Example 4. Moreover, in the above-mentioned Examples 1 and 2,
Although an example using red and green LEDs 1 and 2 is shown as an LED, if white, yellow, blue or the like is used as a light source, various emission colors can be displayed, and basically, as a plateau. By combining LEDs of the three primary colors of red, green, and blue, all emission colors can be obtained.

[0028]

As described above, according to claim 1 of the present invention, the pulse control means sends the control signal for controlling the frequency and pulse width of the lighting signal to each light emitting diode, and the driver control means. Since the lighting signal to each light emitting diode is dynamically lighting-controlled based on the control signal, the display color of the light emitting surface can be easily and variously changed by a simple circuit configuration, and a plurality of light emitting elements can be emitted. Since the diodes are combined into one to emit light from the display surface, the light emitting area can be increased to improve visibility from a distance, and the display color can be changed without changing the hardware. You can Further, since the display color is changed by the dynamic lighting, there is an effect that the light emission efficiency is better than that of the method of changing the display color by simultaneously emitting a plurality of light emitting diodes.

According to the second aspect, by providing the light emitting diodes of the three primary colors of red, green and blue as the light emitting diode, it is possible to obtain all display colors.

According to a third aspect of the present invention, based on the status signal of the operating status of the equipment to be monitored by the pulse control means, the lighting signal of each light emitting diode is emitted to emit any color corresponding to the operating status. Since the frequency and the pulse width are controlled, it is possible to determine the operating state from the display color.

Further, according to the present invention, the pulse control means causes the respective light emitting diodes to be alternately turned on or off in different colors according to the failure factor of the equipment to be monitored based on the failure signal of the equipment to be monitored. Since the frequency and the pulse width of the lighting signal are controlled, it is possible to determine the failure factor from the display color and the display state.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a display device according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram illustrating LED lighting control according to the first embodiment.

FIG. 3 is an LED based on the difference in failure factors according to the second embodiment.
It is a waveform diagram explaining the lighting control of.

FIG. 4 is a configuration diagram showing a display device according to a conventional example.

FIG. 5 is a configuration diagram showing a display device according to a conventional example applied to a C / C controller.

[Description of Reference Signs] 1 red light emitting diode 2 green light emitting diode 3 filter 11 blue light emitting diode 12 driver control circuit 13 driver 14 pulse control circuit

Claims (4)

[Claims] 1. A display device in which a display color of a light emitting surface is changed by controlling lighting of a plurality of light emitting diodes having different light emitting colors, and pulse control means for controlling a frequency and a pulse width of a lighting signal to each of the light emitting diodes, A display device, comprising: driver control means for dynamically controlling lighting signals to the respective light emitting diodes based on the control signal. 2. A display device in which a display color of a light emitting surface is varied by controlling lighting of a plurality of light emitting diodes having different light emitting colors, wherein the light emitting diodes include light emitting diodes of three primary colors of red, green and blue, and A pulse control means for controlling a frequency and a pulse width of a lighting signal to each light emitting diode; and a driver control means for dynamically lighting a lighting signal to each light emitting diode based on the control signal. Display device. 3. A display device in which a display color of a light emitting surface is changed by controlling lighting of a plurality of light emitting diodes having different light emission colors, and an arbitrary color corresponding to the operating state of a monitored facility is determined based on the operating state signal. A pulse control means for controlling the frequency and the pulse width of the lighting signal to each of the light emitting diodes so as to emit light, and a driver control means for dynamically controlling the lighting signal to each of the light emitting diodes based on the control signal. A display device characterized by the above. 4. A display device in which a display color of a light emitting surface is varied by controlling lighting of a plurality of light emitting diodes having different emission colors, and different colors are alternately turned on in accordance with a failure factor of a monitored equipment based on the failure signal. Alternatively, pulse control means for controlling the frequency and pulse width of the lighting signal to each of the light emitting diodes for single-color blink control, and driver control for dynamically lighting the lighting signal to each of the light emitting diodes based on the control signal And a display device.