JPS6057388A - 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 relates to a display device whose display color changes depending on the level of a measured quantity.

Conventionally, display meters that display various information about a vehicle have a single color (□), and there is no display device that has the function of changing the display color depending on the level of the measured quantity. For example, in a car's digital speedometer, the display color is usually blue, no matter what the speed of the car is.
Or it is a constant color of red. The same applies to the fuel display, radiator temperature display, and battery voltage display.

However, when it comes to information regarding the driving conditions of a vehicle, it is generally important to inform whether the vehicle is in a normal state or in a state that requires caution. Therefore, a method has been adopted in which a certain limit value is set and an alarm is output when the limit value is exceeded. This alarm device was provided as a separate device from a digital display or a display that provides a stationary display.

Therefore, it is necessary to provide two indicators, one for quantitative display and one for normal and abnormal operation such as a warning lamp, which is inconvenient for the driver and has the disadvantage of complicating the display panel. There is.

Therefore, the present invention uses an element that can change the color of emitted light in a display that performs quantitative display, and changes the color of the quantitative display according to the level of the measured quantity. The object of the present invention is to provide a new display device that also has the function of transmitting information through changes.

That is, the present invention includes: a detector that detects a physical quantity as an electrical signal; a color range setting section that sets a color range for displaying the physical quantity as an electrical signal; and a signal output from the color range setting unit to determine a color range in which the physical quantity detected by the detector exists; The present invention relates to a display device comprising: a drive device that drives a display device in accordance with a signal; and a variable color display device driven by the drive device and capable of changing its emitted light color.

FIG. 1 is a block diagram 17 diagram illustrating the concept of the present invention.

Physical quantities include vehicle speed, battery voltage, radiator temperature, radiator water volume, engine rotation speed, engine oil volume, gasoline m1 tire air pressure, etc. The detector 2 that detects these physical quantities includes a sensor that converts the physical quantity into an electrical quantity, and a circuit that processes the electrical signal output from the sensor. As the sensor used here, a sensor suitable for detecting the physical quantity (1=well known) may be used. For example, for temperature, a thermistor, for pressure, a pressure sensor, for liquid m,
A device that converts the liquid level into positional information and detects the positional information using a sliding resistance or a potentiometer can be used.

The above thing I! l! m is displayed in different colors according to the divided range. The number of color ranges is not limited.

When the color separation range setting unit 6 that determines the color separation range for displaying the physical m by color separation is configured with an analog signal processing system,
It is composed of a potentiometer, a variable resistor, etc., and if it is composed of a digital circuit, it can be composed of a counter, a #ROM, etc. Further, the color range setting section 6 may be able to be set manually from outside. That is, it may be possible to set the upper and lower limits of the color range using a dial or the like. The color separation range determining section 4 is a circuit portion having a function of determining whether to take the electric signal detected by the detector 2 or the electric signal representing the range boundary value set by the color separation range setting section 6. This color range determination section 4 can be constructed from an analog circuit, a digital circuit, or the like. Further, both the color range determining section 4 and the color range setting section 6 may be configured by a digital computer.

The driving device 8 is a driving device for performing quantitative display on the variable display 10 according to the detected physical quantity, and operates the variable color display 10 with the display color determined by the color range determining section 4. It is something that makes you

As the variable color display 10, any display can be used, such as a light emitting diode, an electroluminescent device, a liquid crystal display, a plasma display, etc., as long as it can change the color of light emitted by an external control signal.

Hereinafter, the present invention will be explained in detail based on specific examples.

FIG. 2 is a block diagram showing the structure of a display device according to a specific embodiment of the present invention.

The present embodiment relates to a digital vehicle speed indicator.
, a pickup coil 22 that forms an electromagnetic connection with the gear 21 and generates an induced voltage according to the rotation of the gear, and a circuit that processes the signal output by the pickup coil 22. The signal processing circuit consists of a comparator 23 for waveform shaping and a trigger pulse generation circuit 24. That is, the comparator 23
is set so that the output becomes a low level when a signal equal to or higher than a certain reference value is input to the non-inverting input terminal. Therefore, the negative pulse output of the comparator 23 is
output in synchronization with the rotation speed. The trigger pulse generation circuit 24 inputs the output of the negative pulse from the comparator 23, and further outputs a trigger pulse to the counter 25 in synchronization with the waveform. The counter 25 receives a reset signal from the timing signal generation circuit 44, is reset once, and then counts the number of pulses output from the trigger pulse generation circuit 24. Further, the timing signal generation circuit 44 resets the counter 25 at regular intervals. Therefore, the value of the counter 25 immediately before being reset indicates the number of pulses input during that reset period. Further, the reset period is set so that the numerical value indicated by the counter 25 directly represents the speed in meters. The counter 25 is composed of a decimal counter.

A signal is sent from the timing signal generation circuit 44 to the register 41, and the register 41 receives a parallel signal from the counter 25. The counter 25 is then reset. The value temporarily stored in the register 41 is transferred to ROM161 and ROM11 by comparator I42 and comparator II43.
It is compared with 1ffi stored in 62. The comparator and the comparator (■) output a decoder 81 according to the comparison result.
and sends a control signal for driving to the decoder 82. Comparators 42 and 43 both output low level signals when the input from register 41 is smaller than the input from ROM. On the other hand, the decoder 11B2 is operated by the control human power 84.
When is at a high level, the green element of the variable indicator 11 is activated, and the decoder I81 activates the red element of the variable indicator 11 when the control power 83 is at a high level. t in ROM61,
The number is 1160000, but the ROM62 has [+18000
0 is stored. Therefore, the detected speed is 6 mph
When the speed is below 0 km/h, a low level control signal is output from the comparator 42, and the control signal 83 of the recorder 81 is activated.
A low level signal is input to the On the other hand, the output of the comparator 43 also becomes a low level, but since it is inverted by the inverter 47, a high level signal is input to the control input 84 of the decoder 11B2). Therefore, the speed is 60 ttm/t+
In the following cases, only the decoder 1182 operates, and the variable color display 11 displays the contents of the register 41 in green.

On the other hand, when the vehicle speed is in the range of 60 to 801 un/h, the output of comparator I42 is at a high level, the output of comparator I43 is at a low level, and control human power 83.84 are both at a high level, causing the decoder 81, decoder [82 operate together. Therefore, in the variable color display 11, both the green element and the red element are lit, and the numerical value is displayed in red and green.

Also, when the vehicle speed exceeds 8Q km/h, the comparator 4
2. The outputs of comparator 43 both become high level, and only decoder I81 operates. Therefore, the variable color display 11
, only the red element lights up and the numerical value is displayed in red. In this way, the display color of the numerical value can be changed depending on the range of the numerical value.

FIG. 3 is a block diagram showing the structure of the variable color display 11 made of light emitting diodes. Of these, FIG. 3(a) shows the segment structure of the variable color display, and FIG. 3(b) shows the segment structure of the variable color display.
A perspective view of one segment component, and FIG. 3(C) is a sectional view thereof. The variable color display 11 consists of segment elements 111. The segment element 111 has lead bins 121, 122, 123. lead bin 1
22 is a common terminal. In this example it is a common anode terminal. A substrate 125 on which light emitting diodes are disposed is provided at the upper end of the lead bin 122, and a red light emitting diode 131 and a blue light emitting diode 130 are mounted on the substrate 125.
No chips are provided.

The cathode of the light emitting diode 130 is connected to the lead frame 121 by a gold wire 126, and the cathode of the light emitting diode 131 is connected to the lead bin 12 by a gold wire 127.
Connected to 3. The light emitting diode, the gold wire, and the upper end of the lead bin are molded with resin 128 mixed with a light scattering agent.

In this manner, the device of this embodiment is a display device that attempts to give a warning to the driver by changing the display color of the digital display depending on the detected speed level. The setting of the range and the number of ranges are not limited.

The present invention can be used not only for vehicle speed display but also, for example, for a fuel display device.

In the display shown in FIG. 4, when the fuel level reaches a certain level or less, the display color may be switched from blue to red.

Further, in the case of an engine rotation speed display as shown in FIG. 5, the entire bar graph may be switched from green light to red light when the engine speed reaches a certain speed or higher.

In summary, the present invention is a display device that changes the color of emitted light depending on the level of the measured quantity.

Therefore, according to the present invention, since the display color is changed according to the level of the measured physical quantity, display information on the display device can be aggregated. Furthermore, since there is no need to separately provide an alarm device or the like, the display panel can be simplified.

Furthermore, it is easy to see for drivers and the like, and information transmission ability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the concept of the present invention. FIG. 2 is a block diagram of a display device according to a specific embodiment of the present invention. FIG. 3 is a block diagram of the variable color display used in the same embodiment. FIG. 4 is a block diagram of another modified example of a variable color display. FIG. 5 is a configuration diagram of a variable color display device according to still another modification. 21...Gear 22...Pickup coil 23...Comparator 24...Trigger generation circuit 121.122.123...Lead bin 130.13
1...Light emitting diode 128...Resin patent applicant Toyoda Gosei Co., Ltd. agent Patent attorney Hirodo Okawa Patent attorney Shudo Hizuki Patent attorney Akio Maruyama

Claims (4)

[Claims] (1) A detector that detects a physical quantity as an electrical signal, a color range setting unit that sets a color range for displaying the physical quantity as an electrical signal, and an electrical signal detected by the detector; , a color range determination unit that compares the signal output from the color range setting unit and determines the color range in which the physical quantity detected by the detector exists; and the signal output from the color range determination unit. A display device comprising: a drive device that drives a display device according to the driving device; and a variable color display device that is driven by the drive device and can change its emitted light color. (2) The variable color display device is characterized in that two or more light emitting diodes emitting light of different colors are arranged in each segment. (3) The variable color display is configured to control the magnitude and polarity of the applied voltage.
The display device according to claim 1, wherein the display device is an electroluminescence display device whose emission color can be changed depending on the frequency. (4) The display device according to claim 1, wherein the variable color display is a liquid crystal display.