JP2001092392A - Display device and measuring instrument using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring instrument which is capable of making multicolor display, simple in structure and low in cost. SOLUTION: The front glass in the front of the measuring instrument 10 is formed of UV cut glass. Display parts 17 and 18 which generate the light of the wavelength region on a longer wavelength side than the blue light from LEDs 23 and 24 of the same kind from the blue light are formed on a dial 14. The display part 17 consists of color conversion layers 17A and 17B and generate green light by absorbing the blue light and the display part 18 consists of color conversion layers 18A and 18B and generate red light by absorbing the blue light. The multicolor display is therefore made possible and since the LEDs 23 and 24 of the same kind are used, the low-cost measuring instrument 10 can be embodied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and an instrument using the same, and more particularly, to a display device and an instrument capable of displaying a plurality of colors using a monochromatic light source.

[0002]

2. Description of the Related Art In a conventional instrument, as shown in FIG. 7, a bulb 1 for generating white light is used as a light source, and light from the light source is transmitted through an ink layer 2 on which red or yellow ink is printed, for example. The red zone and the amber zone were displayed. In the figure, reference numeral 3 denotes a wiring board provided with the bulb 1, reference numeral 4 denotes a dial, and reference numeral 5 denotes a front glass. The ink layer 2 provided on the dial 4 is formed in accordance with the shape of a display unit such as a scale of a meter and characters. FIG. 8 shows the light emission characteristics of the bulb 1. As shown in the figure, the bulb 1 has a light intensity that draws a relatively broad parabola over the visible light range. Ink layer 2
Has the function of a color filter that selectively transmits light of each color wavelength band from such white light. In recent years, there has been an instrument that employs a light emitting diode (hereinafter, referred to as an LED) instead of the bulb 1 in order to achieve low power consumption and long life.

[0003]

However, in the meter using the above-mentioned LED, since the LED emits monochromatic light, the light of the LED cannot be transmitted through the conventional ink layer 2 in some cases. . That is, for example, when light of an LED that generates green light is transmitted through the red ink layer and the yellow ink layer, the green light cannot transmit through the red ink layer and the yellow ink layer. For this reason, it is necessary to arrange LEDs having different emission colors for each display color zone on the instrument. When LEDs having different emission colors are arranged adjacent to each other as described above, it is necessary to provide, for example, a light-shielding wall on the reflector in order to prevent mixing of display colors.

[0004] When LEDs having different emission colors are used as described above, there has been a problem that the structure of the instrument is complicated and the design is restricted accordingly. In addition, since different LEDs are used for different zones of different display colors, there is a problem that the number of types of LEDs increases and the cost increases.

Accordingly, an object of the present invention is to provide a low-cost display device having a simple structure and an instrument using the same.

[0006]

According to the first aspect of the present invention,
A light source that generates light in a predetermined wavelength range, a color conversion layer that absorbs light in the predetermined wavelength range and generates display light in a wavelength range longer than the predetermined wavelength range, and the display light from the color conversion layer. An ultraviolet light blocking member that transmits and blocks ultraviolet light incident on the color conversion layer.

According to the first aspect of the present invention, since the ultraviolet light blocking member blocks ultraviolet light incident on the color conversion layer, deterioration of the material of the color conversion layer is suppressed and the color conversion layer is prevented from deteriorating. Can be maintained for a long time. Therefore, the life of the display device can be extended. According to the first aspect of the present invention, light in a predetermined wavelength range (light source light) emitted from the light source can be converted into light in a different band on the long wavelength side, so that light in the predetermined wavelength range and light generated from the color conversion layer are generated. It is possible to use light of at least two wavelength bands with the display light to be displayed. That is, according to the first aspect of the present invention, two or more display colors can be obtained.

According to a second aspect of the present invention, in the display device according to the first aspect, the light source is a light emitting diode, and the color conversion layer is made of a fluorescent material.

Therefore, according to the second aspect of the invention, in addition to the operation of the first aspect of the invention, by using the light emitting diode as the light source, the light source can be reduced in power consumption and the durability can be enhanced. be able to. Also,
Since the color conversion layer made of a fluorescent material is blocked from entering ultraviolet light by the ultraviolet light blocking member, deterioration is suppressed, and good color conversion characteristics can be maintained over a long period of time.

[0010] Further, the invention according to claim 3 is based on claim 1.
Alternatively, in the display device according to claim 2, the ultraviolet light blocking member is a UV cut glass disposed in front of the color conversion layer.

Therefore, according to the third aspect of the present invention, in addition to the first aspect of the present invention, similarly to the operation of the second aspect of the present invention, it is possible to suppress the ultraviolet light from being incident on the color conversion layer by the UV cut glass. There is action.

According to a fourth aspect of the present invention, in the display device according to the first or second aspect, the ultraviolet light blocking member is made of a UV cut ink applied to a surface of the color conversion layer. It is characterized by becoming.

Therefore, according to the invention of claim 4, in addition to the function of the invention according to claim 1, it is possible to suppress the ultraviolet light from being incident on the color conversion layer with the UV cut ink, similarly to the function of the invention according to claim 2. There is action. In particular, in the invention according to claim 4, since the UV cut ink is applied to the surface of the color conversion layer, it has an effect of reliably preventing ultraviolet light from entering the color conversion layer.

According to a fifth aspect of the present invention, there is provided an instrument having a light source that emits light in a predetermined wavelength range and a display unit that receives light from the light source and displays a predetermined shape. A color conversion layer that is disposed on the instrument dial and absorbs light in the predetermined wavelength range and generates display light in a band located on a longer wavelength side than the predetermined wavelength range, and is provided in front of the display unit. An ultraviolet light blocking member is provided.

According to the fifth aspect of the present invention, since the display portion of a predetermined shape provided on the instrument dial is formed of a color conversion layer, light in a predetermined wavelength range enters the color conversion layer from a light source. Then, light in a wavelength band longer than the predetermined wavelength band is generated. Therefore, light in at least two wavelength bands, that is, light in a predetermined wavelength range and display light generated from the color conversion layer can be used for display. That is, since the display light is emitted in a predetermined shape, it is possible to perform a light emission display according to a desired display shape on the instrument. When the color conversion layer is not disposed in front of the light source, light in a predetermined wavelength range can be used as it is in the display unit. In addition, since the ultraviolet light blocking member is disposed in front of the color conversion layer, the ultraviolet light blocking member blocks ultraviolet light that enters from outside the instrument, thereby preventing ultraviolet light from entering the color conversion layer. Can be. Further, in the present invention, since the plurality of light sources use the same type of light source, the arrangement structure of the light sources is simplified.

The color conversion layer is excited by absorbing the excitation light when the excitation light in a predetermined wavelength range is incident thereon.
With this, new light emission is performed. The color conversion layer can be formed of various fluorescent materials or various EL (electroluminescence) materials having color conversion characteristics. Since these materials are deteriorated by ultraviolet light, the life of the color conversion layer can be extended by disposing the ultraviolet light blocking member in front.

The invention according to claim 6 is the meter according to claim 5, wherein the light source is an LED.

Therefore, according to the invention of claim 6, in addition to the operation of the invention of claim 5, the power consumption of the light source can be reduced by configuring the light source with an LED. In addition, since the LED has a single-color light emission property, it is suitable for allowing light in a predetermined wavelength range to enter the color conversion layer. Therefore, LED
Only by selecting the color conversion layer according to the wavelength band described above, light emission with high luminance can be performed.

Further, the invention described in claim 7 is the same as claim 5
7. The instrument according to claim 6, wherein the color conversion layer is made of a fluorescent material.

Therefore, in the light emission according to the seventh aspect, in addition to the functions of the inventions described in the fifth and sixth aspects, the fluorescent material which is easily degraded by receiving the ultraviolet light can be cleaned by the ultraviolet light blocking member. Has the effect of protecting from.

The invention according to claim 8 is the instrument according to any one of claims 5 to 7, wherein the ultraviolet light blocking member is a UV cut glass disposed in front of the display unit. It is characterized by.

Therefore, the invention described in claim 8 is the same as claim 5
In addition to the effect of the invention described in claim 7, the use of UV cut glass as a front glass of the instrument has an effect of preventing ultraviolet light from being incident on a display portion formed of a color conversion layer. For this reason, it is possible to realize an instrument having good light emission characteristics (color conversion characteristics) over a long period of time without significantly changing the instrument structure.

Further, the invention according to claim 9 is the invention according to claim 5.
8. The instrument according to claim 7, wherein the ultraviolet light blocking member is made of UV cut ink applied to a front surface of the color conversion layer. 9.

Therefore, according to the ninth aspect of the present invention, in addition to the functions of the fifth to seventh aspects, the display portion formed of the color conversion layer is directly protected by the ultraviolet light blocking member. This has the effect of reliably preventing light from entering the color conversion layer.

The invention described in claim 10 is the same as the claim 5.
The instrument according to any one of claims 9 to 9, wherein the plurality of light sources are arranged, and the color conversion layer receives light from the light source and changes the wavelength to different wavelength bands on the longer wavelength side than the predetermined wavelength band. It includes a plurality of types for performing color conversion.

According to the tenth aspect of the present invention, light of a predetermined wavelength range emitted from a light source is converted into light of different wavelength bands by color conversion layers having different color conversion characteristics. Even if the wavelength ranges are the same, display light of different colors can be obtained by the color conversion layer. Therefore, light of at least three wavelength bands, that is, light of at least two wavelength bands generated in these color conversion layers and light of a predetermined wavelength band can be used for display. Thus, in the invention according to claim 10, various kinds of display colors, such as red indicating a red zone, yellow indicating an amber zone, and green and blue indicating a normal state, can be created by one type of light source. it can. Further, since each color conversion layer is protected from ultraviolet light by the ultraviolet light blocking member, it is possible to realize an instrument capable of multicolor display with a long life.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a display device according to the present invention and an instrument using the same will be described in detail based on an embodiment shown in the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing a main part of an instrument 10 according to Embodiment 1. The configuration of the display device will be described as being included in the configuration of the instrument.

The instrument 10 has an instrument case 11 and a facing 1 mounted on an opening on the front side of the instrument case 11.
2, a UV cut glass 13 as an ultraviolet light blocking member mounted between the facing 12 and the opening of the instrument case 11, a dial 14 arranged in the instrument case 11,
And a wiring board 15 arranged behind the rear wall 11A of the instrument case 11. A hand drive shaft (not shown) penetrates through the dial 14 from rear to front.
At the end of the pointer driving shaft protruding forward from the dial 14, a pointer 16 having one end fixed to be parallel to the dial 14 is provided.

The dial 14 is made of a material having a predetermined light transmittance. A plurality (two in FIG. 1) of color conversion layers 17A and 18A formed in a shape such as a character design or a display symbol are formed at predetermined positions on the surface of the dial 14.
The color conversion layer 17 on the front side is also provided on the back side of the dial 14.
A, the color conversion layer 17 at each position corresponding to 18A.
B and 18B are formed. These color conversion layers 17A,
17B, 18A, and 18B are formed of a color conversion material such as a fluorescent material or an electroluminescent material that absorbs light in a predetermined wavelength range and generates light in a wavelength range longer than the predetermined wavelength range. The color conversion layers 17A and 17B forming a pair constitute display units 17 and 18, respectively. The rear wall 1 behind each of the display units 17 and 18
In 1A, light transmission ports 21 and 22 are opened at positions corresponding to the display sections 17 and 18, respectively. LEDs 23 and 24 are provided on the front surface of the wiring board 15 behind the light transmission ports 21 and 22, respectively.

In this embodiment, all the LEDs 2
3, 24 (including other LEDs not shown) emit blue light (4
It is a blue LED that generates a wavelength range of about 34 nm.
FIG. 3 shows an LED 23 used as a light source in the present embodiment,
24 shows the emission wavelength characteristic of No. 24.

As the color conversion layers 17A and 17B, well-known green conversion layers that absorb blue light and generate green light (wavelength range of about 546 nm) are used. The color conversion layers 18A and 18B absorb blue light and emit red light (7
A well-known red conversion layer that generates a wavelength range of about 00 nm) is used.

Next, the display units 17 and 18 of the instrument 10
The operation in the above will be described.

FIG. 2 shows a display unit 1 constituting a part of the display mounting.
It is principal part sectional explanatory drawing which shows 7 vicinity. When a driving voltage is applied to the LED 23, it emits blue light (shown by a broken line in FIG. 2). The blue light generated from the LED 23 passes through the light transmission port 21 formed in the rear wall 11A of the instrument case 11 as shown in FIG. Irradiated. Color conversion layer 17
The blue light incident on B is absorbed, and the blue light transmitted through the color conversion layer 17B and the dial 14 is absorbed by the color conversion layer 17A. At the same time, the color conversion layers 17B and 17A emit green light having a longer wavelength side than the blue light as luminescence due to the energy obtained by absorbing the blue light.
The green light emitted from the color conversion layers 17B and 17A passes through the UV cut glass 13 which is the front glass of the instrument 10, is emitted forward as display light, and is visually recognized as a green display image by an observer. .

From the outside of the instrument 10, ultraviolet light (indicated by a dashed arrow in FIG. 2) is incident on the instrument 10,
Since the UV cut glass 13 blocks ultraviolet light, the UV cut glass 13 has an effect of preventing the ultraviolet light from entering the color conversion layers 17A and 17B. This ultraviolet light blocking effect is the same in the display unit 18 and a display unit (not shown).

In the vicinity of the display unit 18, the blue light from the LED 24 passes through the light transmission port 22 formed in the rear wall 11 A of the instrument case 11, and is limited to light traveling forward and mainly toward the display unit 18. Irradiated. The blue light incident on the color conversion layer 18B is absorbed, and the color conversion layer 18B and the dial 1
The blue light transmitted through 4 is absorbed by the color conversion layer 18A. At the same time, the color conversion layers 18B and 18A emit red light having a longer wavelength side than the blue light as luminescence due to the energy obtained by absorbing the blue light. The red light emitted from the color conversion layers 18B and 18A is
The light passes through the UV cut glass 13 as the front glass of the instrument 10, is emitted forward as display light, and is visually recognized as a red display image by an observer. FIG. 4 shows emission wavelength characteristics generated from the color conversion layers 18B and 18A in the display unit 18, and shows that there is a peak in a wavelength region of 700 nm.

In the above-described embodiment, green display and red display can be performed using an LED that emits blue light. If a display unit that transmits blue light is provided, for example, it is possible to perform three-color display of blue display, green display, and red display with one type of LED. In particular, unlike a color filter, the color conversion layer absorbs incident light in a predetermined wavelength range and effectively uses the energy to generate light in a different wavelength range, so that the generated light has high luminance and display visibility. There is an advantage of increasing. Further, since ultraviolet light can be prevented from being incident on the color conversion layers constituting each display unit from the outside of the instrument 10, deterioration of the color conversion layers can be suppressed.

(Embodiment 2) FIG. 5 is an explanatory sectional view showing a main part of an instrument according to Embodiment 2 of the present invention. The instrument 30 of the present embodiment uses a normal transparent glass 31 as a front glass, and a UV cut ink layer 32 is applied on the front side of the dial 33 as an ultraviolet light blocking member. In addition, on the dial 33 to which the UV cut ink layer 32 is applied, the same color conversion layers 34A and 34B as those of the first embodiment are arranged on the front and back sides in advance. Further, similarly to the first embodiment, the wiring board 3
An LED 36 is provided on the front surface of the LED 5. Note that other configurations in the present embodiment are the same as those in the above-described first embodiment, and a description thereof will be omitted.

In the present embodiment, since the UV cut ink layer 32 is formed so as to directly cover the color conversion layer 34A, the function of reliably preventing ultraviolet light from entering the color conversion layers 34A and 34B is provided. is there. Further, since ordinary transparent glass is used as the front glass, the cost can be reduced. Also in this embodiment, since a color conversion layer that generates light in a wavelength band longer than the wavelength of light from the LED 36 is used as a color conversion layer, light with a relatively short wavelength band is generated. The use of the LED 36 enables a large number of colors to be displayed, as in the first embodiment.

(Embodiment 3) FIG. 6 is an explanatory sectional view showing a main part of an instrument according to Embodiment 3 of the present invention. Embodiment 3
Is a modification of the first embodiment. In the instrument 40 of this embodiment, similarly to the above-described first embodiment, a UV cut glass 41 is disposed on the front surface of an instrument case (not shown), and a plurality of blue light sources are generated behind the dial 46 (FIG. 6). A wiring board 45 including three (3) LEDs 42, 43, and 44 on the front surface is disposed. And L of the dial 46
In a region located in front of the ED 42, a blue color filter 47 is formed on the front side. In addition, the dial 46
The color conversion layers 48A and 48B are formed on the front and back surfaces of a region located in front of the LED 43. These color conversion layers 48A and 48B are formed of a color conversion material that absorbs blue light and generates green light. Further, color conversion layers 49A and 49B are formed on the front and back surfaces of a region of the dial 46 located in front of the LEDs 44. These color conversion layers 4
9A and 49B are formed of a color conversion layer material that absorbs blue light and generates red light. Note that other configurations in the present embodiment are the same as those in the above-described first embodiment, and a description thereof will not be repeated.

In the third embodiment, blue display, green display,
In addition, the display of three colors of red display can be realized by the LEDs 42, 43, and 44 that generate one type of blue light. In addition, since all the color conversion layers are protected from ultraviolet light by the UV cut glass 41 arranged on the front surface of the instrument case, it is possible to suppress the deterioration of the material and the light emission performance.

In the third embodiment, the color purity of blue light generated from the LED 42 can be increased by using the blue color filter 47.

As described above, in the third embodiment, multicolor display can be performed by one type of LED, so that the cost of the display device can be reduced. Further, in the present embodiment, it is possible to prevent the deterioration of the color conversion layer and the color filter due to the ultraviolet light and achieve a long life while realizing the multi-color display of the instrument.

Although the embodiments have been described above, the present invention is not limited to these, and various changes accompanying the gist of the configuration are possible. For example, in each of the embodiments described above, an LED that emits blue light is used as a light source, but an LED that emits green light may be used.
In short, various LEDs that generate light in a shorter wavelength range than light in a desired wavelength range generated by the color conversion layer can be used.

Further, as the light source, a light emitting device capable of surface light emission such as an inorganic EL light emitting element or an organic EL light emitting element for generating monochromatic light may be used other than the LED. Furthermore, various types of display devices and instruments can be applied, and if applied to an in-vehicle instrument, ultraviolet light included in external light can be effectively blocked, so that a long-life light instrument for multicolor display can be realized.

Further, although the color conversion layer used in each of the above embodiments is formed on the front and back surfaces of the dial, it is also effective to form the color conversion layer on any one of the surfaces.

In the above-described embodiment, the light generated from the color conversion layer is used as the display light. However, the combined light composed of the light generated from the color conversion layer and the light transmitted through the color conversion layer is used as the display light. It may be configured to be used.

[0048]

As is apparent from the above description, according to the first aspect of the present invention, since the ultraviolet light blocking member blocks ultraviolet light entering the color conversion layer, the material of the color conversion layer Deterioration can be suppressed and the color conversion characteristics of the color conversion layer can be maintained for a long period of time, and the life of the display device can be extended. Further, according to the first aspect of the present invention, a plurality of colors can be displayed using one type of light source, so that there is an effect of reducing costs.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, by using a light emitting diode as a light source, the light source can be reduced in power consumption and durability can be improved. effective. Further, since the color conversion layer made of the fluorescent material is protected from ultraviolet light by the ultraviolet light blocking member, there is an effect that material deterioration is suppressed and good color conversion characteristics can be maintained for a long period of time.

According to the third aspect of the present invention, similarly to the effects of the first and second aspects of the present invention, since the UV cut glass is used to suppress the ultraviolet light from being incident on the color conversion layer, the color is reduced. This has the effect of preventing deterioration of the material and performance of the conversion layer.

According to the fourth aspect of the present invention, similar to the effects of the first and second aspects of the present invention, the color conversion is performed to suppress the ultraviolet light from entering the color conversion layer with the UV cut ink. This has the effect of preventing the layer from deteriorating. Claim 4
According to the invention described above, since the UV cut ink is applied to the surface of the color conversion layer, there is an effect of surely preventing ultraviolet light from entering the color conversion layer.

According to the fifth aspect of the present invention, a plurality of colors of instrument display can be performed by one kind of light source. Further, the ultraviolet light blocking member blocks ultraviolet light incident from the outside of the instrument, thereby preventing the ultraviolet light from entering the color conversion layer, and has an effect that a long-life instrument display can be performed.

According to the sixth aspect of the present invention, in addition to the effect of the fifth aspect of the present invention, the light source can be reduced in power consumption by configuring the light source with an LED. Also, L
Only by selecting the color conversion layer according to the wavelength band of the ED, it is possible to emit light with high luminance.

According to the light emission of the seventh aspect, in addition to the effects of the inventions of the fifth and sixth aspects, the fluorescent material which is easily degraded by receiving the ultraviolet light is treated by the ultraviolet light blocking member with the ultraviolet light. Therefore, there is an effect that display with a long life is performed.

According to the invention of claim 8, in addition to the effects of the inventions of claims 5 to 7, the use of a UV cut glass as a front glass of the instrument makes it possible to provide a display portion comprising a color conversion layer. Ultraviolet light can be prevented from entering. For this reason, there is an effect that an instrument having good light emission characteristics (color conversion characteristics) can be realized for a long time without largely changing the instrument structure.

According to the ninth aspect of the present invention, in addition to the effects of the fifth to seventh aspects, the display portion formed of the color conversion layer is directly protected by the ultraviolet light blocking member. Light can be reliably prevented from being incident on the color conversion layer, and this has the effect of improving the durability of the color conversion layer.

According to the tenth aspect of the present invention, light in a predetermined wavelength range emitted from the light source is converted into light in different wavelength bands by the color conversion layers having different color conversion characteristics. However, there is an effect that display light of a plurality of different colors can be performed depending on the color conversion layer, even if the same. Further, since each color conversion layer is protected from ultraviolet light by an ultraviolet light blocking member, it is possible to realize an instrument capable of multi-color display with a long life.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a meter according to a first embodiment of the present invention.

FIG. 2 is an explanatory sectional view showing a main part of the meter according to the first embodiment.

FIG. 3 is a diagram illustrating emission wavelength characteristics of an LED that emits blue light used in the first embodiment.

FIG. 4 is a diagram illustrating emission wavelength characteristics of a color conversion layer according to the first embodiment.

FIG. 5 is an explanatory sectional view showing a second embodiment of the meter according to the present invention.

FIG. 6 is an explanatory sectional view showing a third embodiment of the meter according to the present invention.

FIG. 7 is an explanatory sectional view showing a conventional meter.

FIG. 8 is a diagram showing emission wavelength characteristics of a light source used in a conventional instrument.

[Explanation of symbols]

 10, 30, 40 Meter 17, 18 Display 17A, 17B, 18A, 18B Color conversion layer 23, 24, 36, 42, 43, 44 LED 34A, 34B Color conversion layer 48A, 48B, 49A, 49B Color conversion layer 13 , 41 UV cut glass 32 UV cut ink layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C096 AA27 AA29 BA04 CA18 CB07 CC06 CC21 CC36 CD36 CH06 FA01 FA11 FA17 5F041 AA11 AA12 AA44 DC23 EE22 EE24 EE25 FF01 FF16

Claims (10)

[Claims] 1. A light source that generates light in a predetermined wavelength range, a color conversion layer that absorbs light in the predetermined wavelength range and generates display light in a wavelength range longer than the predetermined wavelength range, and a color conversion layer. And an ultraviolet light blocking member that transmits the display light and blocks ultraviolet light incident toward the color conversion layer. 2. The display device according to claim 1, wherein said light source is a light emitting diode, and said color conversion layer is made of a fluorescent material. 3. The display device according to claim 1, wherein the ultraviolet light blocking member is a UV cut glass disposed in front of the color conversion layer. . 4. The display device according to claim 1, wherein the ultraviolet light blocking member is made of UV cut ink applied to a surface of the color conversion layer. . 5. An instrument, comprising: a light source that emits light in a predetermined wavelength range; and a display unit that receives light from the light source and displays a predetermined shape, wherein the display unit is provided on an instrument dial. A color conversion layer that absorbs light in the predetermined wavelength range and generates display light in a band located on a longer wavelength side than the predetermined wavelength range, and an ultraviolet light blocking member is disposed in front of the display unit. An instrument characterized by being performed. 6. The instrument of claim 5, wherein said light source is a light emitting diode. 7. The instrument according to claim 5, wherein the color conversion layer is made of a fluorescent material. 8. The instrument according to claim 5, wherein the ultraviolet light blocking member is a UV cut glass disposed in front of the display unit. 9. The instrument according to claim 5, wherein the ultraviolet light blocking member is made of UV cut ink applied to a front surface of the color conversion layer. 10. The instrument according to claim 5, wherein a plurality of said light sources are arranged, and said color conversion layer receives light from said light source and has a wavelength longer than said predetermined wavelength range. A plurality of types for performing color conversion to different wavelength bands on the side.