JP3599186B2 - Display device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device for transmitting (backlighting) a display panel by turning on a light source, and for example, to a display device mounted on various vehicles typified by automobiles, motorcycles, ships, agricultural construction machines, and aircraft.
[0002]
[Prior art]
For example, a dashboard of an automobile is equipped with a display device composed of an instrument, and displays various kinds of measured values, for example, vehicle speed, engine speed, cooling water temperature, fuel, and the like. If it is a pointer-type instrument, a pointer that rotates in response to a measurement signal from a sensor, and a scale plate having a display unit composed of characters and scales arranged according to the rotation of the pointer. The measurement value is displayed when the pointer points to the display unit.
[0003]
Such a pointer-type instrument usually has a light source for illumination so that visibility can be ensured even when the surroundings are dark, for example, at night, and a light source arranged behind a display panel in the display unit. And backlight (transmitted) illumination of pointers.
[0004]
The display panel applied to such a transmitted-light-type pointer-type instrument has a light-transmitting display portion forming characters, scales, indicators, and the like corresponding to the operation of the pointer, and a light-shielding portion forming a background of the display portion. The display portion and the ground color portion are formed on a light transmissive substrate by screen printing, for example. At this time, the display unit is printed and formed on the substrate using an ink having a suitable color light transmittance, and the ground color unit is shielded using a dark-colored light-shielding ink such as black so as not to block the display unit. It is formed so as to be uniformly printed on a substrate, and is configured to be able to transmit and illuminate a light-transmissive display unit with light emitted from a light source.
[0005]
5 and 6 show the general structure of a transmitted illumination type pointer-type instrument. FIG. 5 is a front view of the pointer-type instrument, and FIG. 6 is a sectional view taken along line AA of FIG. And a tachometer (tachometer) for displaying the number of revolutions of the engine. That is, in FIGS. 5 and 6, the display panel includes a first display unit 02 including a rotation speed display unit and a scale display unit according to the rotation operation of the hands 01, and an alarm zone indicating that the rotation speed is within the alarm range. It has a second display section 03 composed of a display section, and a ground color section 04 serving as a background of the display sections 02 and 03. The first display section 02 is formed of, for example, a white colored layer 02a, the second display section 03 is formed of, for example, a red colored layer 03a, and the ground color section 04 is formed of a black ground color layer 04a, each of which is light transmitting. It is formed of a colored ink printed on a transparent substrate 05 (see FIG. 6).
[0006]
A light source 06 is disposed behind the display units 02 and 03, and the light emitted from the light source 06 illuminates the first and second display units 02 and 03 in different colors. As the light source 06, for example, a tungsten lamp (incandescent bulb) or a light emitting diode is generally used, but recently, with the digitization of the display device itself, a light emitting diode suitable for driving a microcomputer has been widely used. Was.
[0007]
Since a tungsten lamp has a relatively wide wavelength range (spectral distribution) of the irradiation light component, the colored layers 02a and 03a function as a color filter that absorbs unnecessary wavelength components and passes necessary wavelength components. The illumination colors of the display units 02 and 03 can be adjusted in a relatively wide range, and in many cases, the colors of the colored layers 02a and 03a themselves are the illumination colors.
[0008]
Since the light emitting diode has a narrower wavelength range of the irradiation light component than the tungsten lamp, even if the colored print layer is made to function as a color filter, there is a limit to the illumination color obtained through it. Therefore, even if the first and second display units 02 and 03 are to be illuminated with different colors by the light source 06 composed of a single (common) light emitting diode, the illumination colors of the first and second display units 02 and 03 are different. There is a case where there is almost no difference.
[0009]
For example, in the case where a light emitting diode that emits orange emission light whose dominant wavelength belongs to the range of 586 nm to 592 nm is used as the light source 06, the first display unit 02 including the white colored layer 02a has the same emission color as the light source 06. Although illuminated in orange, the illumination color of the second display unit 03 made of the red coloring layer 03a is the same as or very close to the emission color of the light source 06 itself (the illumination color of the first display unit 02). Prone. This is because the wavelength component (spectrum) of the radiated light of the light source 06 is concentrated in a specific wavelength range, so that color change hardly occurs even when the light passes through the red colored layer 03a.
[0010]
Therefore, for example, in order to increase the redness of the illumination color of the second display unit 03 and obtain a color difference from the illumination color of the first display unit 02, the color of the coloring layer 03a is set to a dark red color with a strong reddish color as much as possible. , And among the wavelength components of the radiated light, the orange or yellow wavelength component is absorbed, and the red wavelength component is passed, thereby increasing the redness of the illumination color of the second display unit 03, It is conceivable to make the illumination color of the first display unit 02 different.
[0011]
Further, in order to clarify the color difference between the illumination colors of the first and second display portions 02 and 03, the coloring layer 03a may be formed of red fluorescent ink mixed with a fluorescent substance, or the coloring layer 03a and the light source 06 may be used. By providing a toning layer (not shown) made of fluorescent ink between them, the light emitted from the light source 06 is converted into long-wave light, and the red color of the illumination color of the second display unit 03 is increased. It is also conceivable to make the illumination color of the display unit 02 different from that of the first display unit 02.
[0012]
[Problems to be solved by the invention]
However, in the former example in which the colored layer 03a forming the second display portion 03 is set to a dark red color tone, the light reflectance of the colored layer 03a (the light reflectance when light is applied from the outside) decreases. Thus, when the display panel is viewed by external light reflection, the color of the second display unit 03 is visually recognized as dull or dark, and the color contrast between the ground color unit 04 and the second display unit 03 (color contrast) Difference) tends to worsen. On the other hand, in order to secure the color contrast between the ground color portion 04 and the second display portion 03 when the external light is visually recognized, the colored layer 03a has a light reflectance higher than the dark red color tone, such as orange-red or the like, which is light reddish. When the color tone is set, it is difficult to differentiate the color from the illumination color of the first display unit 02 when the light source 06 illuminates.
In the latter example in which wavelength conversion is performed using fluorescent ink, the fluorescent ink itself is expensive and has problems such as weather resistance (discoloration and fading) due to ultraviolet rays, and is not necessarily preferred.
The present invention has been made in view of this point, and improves the color difference between the second display unit and the ground color unit when visually recognized by external light, and illuminates the first and second display units when illuminated by a light source. Are provided.
[0013]
[Means for Solving the Problems]
According to another aspect of the present invention, there is provided a light source including a light emitting diode or electroluminescence, a first display unit that is illuminated with the light emitted by the light source, and a light that is transmitted with an illumination color different from the light emitted by the light source. A display panel having a second display unit to be illuminated, and a ground color part forming a background of the first and second display units, wherein the display panel is provided between the second display unit and the light source. A light-transmissive toning layer that adjusts the emitted light to a color different from the emission color of the light source by passing a predetermined wavelength component out of the emitted light component emitted by the light source is formed, and the second display unit is It is characterized by being formed from a colored layer having a higher light reflectance than the toning layer.
[0015]
The light source emits light of a color belonging to a range from yellow to orange.
[0016]
The light emitting diode emits light having a dominant wavelength of about 575 nm to 595 nm.
[0017]
The toning layer has a reddish color tone than the coloring layer.
[0018]
The display panel may be a scale plate of an instrument mounted on various vehicles, and the second display unit may be an alarm display unit.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
A display device according to the present invention includes a light source including a light emitting diode, a first display unit that is illuminated by the light emitted from the light source, and a second display unit that is illuminated by a light having a color different from the light emitted from the light source. And a display panel having at least a ground color part constituting a background of the first and second display parts. A predetermined wavelength component of the radiated light component emitted by the light source is passed between the second display unit and the light source, and the color is different from the color (emission color) of the radiated light originally possessed by the light source. A light-transmitting toning layer to be adjusted is formed, and the second display section is formed from a coloring layer having a higher light reflectance than the toning layer.
With such a configuration, when the light source is not lit or the like, when the image is visually recognized by external light, dullness or darkening of the second display portion is suppressed to improve the color difference from the ground color portion. The illumination color of the second display unit can be made different, and the differentiation of the color itself when the external light is visually recognized and the differentiation of the illumination color at the time of illumination can be achieved without using fluorescent ink. Can be.
[0020]
Although any light source can be used as the light source, the present invention is suitable for a light source of a type having a relatively narrow wavelength range of emitted light, such as a light emitting diode or EL (electroluminescence).
[0021]
In addition, if the first and second display units are configured to transmit and illuminate different illumination colors with a common light source, the emission colors of the light sources, the colors of the first and second display units themselves, and their illuminations The color is arbitrary, but in the toning layer, the emitted light can be changed to a color different from the color of the emitted light (emission color) originally possessed by the light source. Therefore, it is desirable that the light-transmitting layer has a higher light reflectance than the toning layer and can transmit the wavelength component of the light passing through the toning layer satisfactorily. Setting to is advantageous.
[0022]
When the display panel is used as a scale plate of an instrument mounted on various vehicles such as automobiles, and the second display unit is configured as an alarm display unit such as a red zone display unit of a pointer-type instrument, as a light source. When adjusting the illumination color of the second display unit to a more reddish color (long-wave light) using a light emitting diode that emits radiation light of a color belonging to the range from yellow to orange and radiation light of about 575 nm to 595 nm at a dominant wavelength. The present invention is suitable.
[0023]
【Example】
Hereinafter, an embodiment will be described with reference to the accompanying drawings, taking as an example the case where the display device according to the present invention is applied as a pointer-type instrument, for example, to a pointer-type tachometer for an automobile.
[0024]
FIG. 1 is a plan view of a pointer type tachometer according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. It is.
[0025]
In FIG. 2, the pointer type tachometer according to the present embodiment includes a circuit board 1, an instrument main body 2, a frame 3, a pointer 4, a display panel 5, and a light source 6.
[0026]
The circuit board 1 is made of a hard circuit board made of paper phenol or glass epoxy, and a plurality of wiring patterns (not shown) made of a predetermined copper foil material are formed on the front side thereof. 2 and the light source 6 are electrically connected.
[0027]
The instrument main body 2 is mounted on the back side of the circuit board 1. For example, a drive shaft 21 and a terminal (not shown) that rotate according to a measured amount including a traveling speed penetrate the circuit board 1 and protrude forward. The terminal is connected to the wiring pattern by soldering.
[0028]
The frame 3 is made of a white synthetic resin and is disposed on the circuit board 1 between the circuit board 1 and the display panel 5. The frame 3 surrounds the drive shaft 21 and the light source 6 and faces the pointer 4. It comprises a tubular portion 31 extending and a reflecting portion 32 for reflecting light from the light source 6 to the display panel 5 side.
[0029]
The hands 4 are linearly formed of a transparent synthetic resin, for example, an orange hot stamp layer (not shown) is formed on the back surface thereof, and a cover 41 having a light-shielding property is attached to the rotation center thereof. The drive shaft 21 is configured to be able to point to a display unit of the display panel 5 described later.
[0030]
The display panel 5 is a plate or sheet material supported by the frame 3, and includes a rotation number display unit and a scale display unit corresponding to the rotation operation of the hands 4 on the front side of a substrate 51 made of a transparent synthetic resin. It has a first display section 52, a second display section 53 composed of an alarm zone display section indicating that the rotation speed is within the alarm range, and a ground color section 54 serving as a background of each of the display sections 52, 53. (See FIG. 1).
[0031]
As shown in detail in FIG. 3, the first display section 52 is made of, for example, a first colored layer 52 a of white, and the second display section 53 is made of, for example, a reddish orange (reddish orange) color tone. The ground color portion 54 is composed of, for example, a black ground color layer 54 having a light-shielding property, each of which is formed by screen printing using an ultraviolet-curable ink. The layers 52a and 53a are formed by printing using a light-transmitting ink in a blank portion where the ground color portion 54 is not formed.
[0032]
At the back surface of the substrate 51 corresponding to the second colored layer 53a, between the second colored layer 53a and the light source 6, the emission light (emission color) of the light source 6 is adjusted to a different color. The light-transmitting toning layer 55 is formed by printing using a UV curable ink on a screen. In this case, the toning layer 55 has, for example, a reddish tone similar to that of the second colored layer 53a, The color is set to a deep red tone with a stronger reddish tone.
[0033]
The light source 6 is a surface-mounted light-emitting diode that transmits and illuminates the pointer 4 and the display panel 5 (the first and second display units 52 and 53), and its emission color is, for example, an orange color having a dominant wavelength of about 590 nm. is there.
[0034]
When the light source 6 is turned on, the emitted light reaches the pointer 4 and illuminates the pointer 4 in orange in the case of the light source 6 that illuminates the pointer 4. In the case of the light source 6 that illuminates the display panel 5, the light passes through the first coloring layer 52a, illuminates the first display section 52 with the same orange color as the emission color of the light source 6, and includes the toning layer 53a and the second After passing through the coloring layer 53, the second display unit 53 is turned to a color different from the illumination color of the first display unit 52, that is, a reddish orange (for example, a dominant color) that is more reddish than the orange light emitted from the light source 6. (Color of 605 to 615 nm in wavelength).
[0035]
Here, the toning layer 55 absorbs the wavelength component close to orange or yellow among the wavelength components of the emitted light that determines the emission color of the light source 6, and allows the red wavelength component to pass therethrough. The color is adjusted to a reddish orange color close to the color of the second colored layer 53a itself.
[0036]
Further, the second colored layer 53a itself is set to a reddish orange color tone as described above, and the light reflectance is set to be higher than that of the toned layer 55 having a dark red color tone. The high light reflectance of the second coloring layer 53a with respect to the toning layer 55 means that, for example, a layer forming the toning layer 55 and a layer forming the second coloring layer 53a on a predetermined same substrate. Is provided, and when the same amount of external light is applied, the second coloring layer 53a reflects a larger amount of light than the toning layer 55.
[0037]
As described above, when the light source 6 is turned on, the first display section 52 has the same orange color as the light emission color of the light source 6, and the second display section 53 has the light source formed by the light passing through the toning layer 55 and the second coloring layer 53 a. 6 is illuminated in a reddish-orange color different from the luminescent color of 6, so that the first display unit 52 and the second display unit 53 are illuminated with different illumination colors. You can have.
[0038]
On the other hand, when the light source 6 is not turned on, the display panel 5 is visually recognized by an observer when the surface of the display panel 5 is exposed to external light. At this time, the first display unit 52 is white and the second display unit 53 is It is visually recognized as reddish orange. Since the second display unit 53 is set to a color tone having a higher light reflectance than the toning layer 55, the second display unit 53 is prevented from dulling or darkening, and the ground color unit 54 and the second display unit are controlled. The color contrast with 53 can be made good.
[0039]
That is, when illuminating the second display unit 53 with a strong reddish color different from the first display unit 52 (the emission color of the light source 6), conventionally, the second display unit 53 itself has a low light reflectance and a high darkness. It is necessary to set to a red color tone, so that the second display section 53 is visually recognized as dull or darkened in the ground color section 54, and the color contrast between the second display section 53 and the ground color section 54 is deteriorated. In this embodiment, a toning layer 55 is formed separately from the second coloring layer 53a forming the second display section 53, and the light reflectance of the toning layer 55 The second colored layer 53a is set to be lower than the second colored layer 53a so as to function as a color filter at the time of transmitted illumination, and the second colored layer 53a is set to a layer having a high light reflectance that determines a color tone at the time of visual recognition by external light reflection. To prevent darkening of the second display unit 53 during visual recognition due to external light reflection First, those having both differentiated illumination color of the second display section 52, 53 at the time of lighting.
[0040]
As described above, in the present embodiment, the light source 6, the first display unit 52 that is transmitted and illuminated by the light emission color of the light source 6, and the second light that is transmitted and illuminated by an illumination color different from the light emission color of the light source 6. A display panel 5 having a display unit 53 and a ground color unit 54 constituting a background of the first and second display units 52 and 53; a light source between the second display unit 53 and the light source 6; A light-transmissive toning layer 55 for passing a predetermined wavelength component of the emitted light component emitted by the light source 6 and adjusting the emitted light to a color different from the emission color of the light source 6 is formed, and the second display unit 53 Is formed from the colored layer 53a having a higher light reflectivity than the toning layer 55, thereby suppressing darkening of the second display section 53 and improving the color difference from the ground color section 54 during visual recognition by external light reflection. At the time of illumination by the light source 6, the illumination colors of the first and second display units 52 and 53 can be made different. Moreover it can be achieved without the use and differentiate colors when such external light viewing, the fluorescent ink to differentiate the illumination color during lighting.
[0041]
In this embodiment, the light source 6 composed of a light emitting diode having a dominant wavelength of about 592 nm is used. However, the light source 6 composed of a light emitting diode that emits light of a color belonging to the range of yellow to orange is used for the alarm zone display unit. When the second display unit 53 made of is illuminated with a strong reddish color different from that of the first display unit 52, a light-emitting diode that emits light of about 575 nm to 595 nm (dominant wavelength) can be used.
[0042]
FIG. 4 is a cross-sectional view of a main part of a display panel showing a second embodiment of the present invention. In this embodiment, a toning layer 55 and a second coloring layer 53a are provided on the surface of a substrate 51, and the toning layer 55 is provided. Are arranged on the surface of the substrate 51 so as to be located closer to the light source 6 than the second colored layer 53a. With such a configuration, the same effect as in the first embodiment can be expected.
[0043]
In the first and second embodiments, the case where the first display section 52 is illuminated with the same orange color as the light source 6 and the second display section is illuminated with reddish orange is shown. A light-emitting diode having a yellow-green emission color (for example, 557 nm to 570 nm in dominant wavelength) is used, the toning layer 55 is set to a layer having a dark green color tone, and the second coloring layer 53 a is May be set to a yellowish green color tone layer having a high light reflectance so that the second display unit 53a is visually recognized or illuminated with a yellowish green color.
[0044]
【The invention's effect】
As described above in detail, the present invention provides a light source including a light emitting diode or electroluminescence, a first display unit that is illuminated by the light emitted from the light source, and a light that is transmitted by an illumination color different from the light emitted from the light source. A second display unit to be illuminated; and a display panel having at least a ground color part constituting a background of the first and second display units. Forming a light-transmissive toning layer that adjusts the emitted light to a color different from the emission color of the light source by passing a predetermined wavelength component of the emitted light component emitted by the light source, and displays the second display. The color difference between the second display portion and the ground color portion is improved when the light is visually recognized by the external light, and the first and second colors are formed when the light is illuminated by the light source. Display that can make the illumination color of the display unit different It is possible to provide a location.
[Brief description of the drawings]
FIG. 1 is a plan view of a pointer-type tachometer serving as a display device according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along the line AA of FIG. 1;
FIG. 3 is an essential part cross-sectional view along the line BB of FIG. 1;
FIG. 4 is an essential part cross-sectional view showing a second embodiment of the present invention.
FIG. 5 is a front view showing a conventional example.
FIG. 6 is a sectional view of a main part taken along line AA of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit board 2 Instrument main body 3 Frame 4 Hand 5 Panel member 6 Light source 21 Drive shaft 31 Cylindrical part 32 Reflection part 41 Cover 51 Substrate 52 First display part 52a First coloring layer 53 Second display part 53a 2 colored layer 54 ground color portion 54a ground color layer 55 toning layer

Claims (5)

A light source comprising a light emitting diode or electroluminescence ,
A first display unit that is illuminated by the light emitted from the light source, a second display unit that is illuminated by a different illumination color from the light emitted by the light source, and a background of the first and second display units. And a display panel having a ground color portion constituting
A light-transmitting element that adjusts the emitted light to a color different from the emission color of the light source by passing a predetermined wavelength component of the emitted light component emitted by the light source between the second display unit and the light source; Forming a toning layer,
The display device, wherein the second display section is formed from a colored layer having a higher light reflectance than the toning layer. The display device according to claim 1, wherein the light emitting diode emits light having a color belonging to a range from yellow to orange . 3. The display device according to claim 2, wherein the light emitting diode emits light having a dominant wavelength of about 575 nm to 595 nm . 4. The display device according to claim 3, wherein the toning layer has a reddish color tone than the coloring layer . 5. The display panel according to claim 2, wherein the display panel includes a scale plate of an instrument mounted on various vehicles, and the second display unit includes a display unit for an alarm. 6. the display device according.

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