JP2022049198A - Charge prevention display device and vehicle measuring unit having the same - Google Patents

Abstract

To provide a charge prevention display device with a simple structure that can prevent wrong operations of a display element caused by static electricity and light leakage from the inside of a display device with balance, and a vehicle apparatus using the charge prevention display device.SOLUTION: A charge prevention display device 10 and a vehicle apparatus 30 using the charge prevention display device sequentially include: a display element; a light shielding plate 19 having a light transmission region 15 and a light shielding unit 17; and a lens member 21 along a vertical direction from the bottom. The light shielding unit has a light shielding layer 23 with a transmission concentration of at least 6 and a resistance of at least 5×1012 Ω/cm.SELECTED DRAWING: Figure 1

Description

The present invention provides an antistatic display device capable of preventing malfunction of the display element due to static electricity and deterioration of display quality due to light leakage from the inside of the display device in a well-balanced manner even if the structure is simple. The present invention relates to a vehicle instrument equipped with such an antistatic display device.

In a vehicle instrument including a liquid crystal display element as a display element, a malfunction of the display element due to static electricity may occur. For example, static electricity charged on a person may flow into the vehicle instrument when the person touches the vehicle instrument, causing a malfunction.

Therefore, as shown in FIGS. 8A and 8B, the potential difference between the display board 101 and the circuit board 105 can be reduced, so that even if static electricity reaches the instrument device 100 from the upper case 115 or the like, it is caused by static electricity. An instrument device 100 capable of preventing a malfunction of the liquid crystal panel 103 is proposed (Patent Document 1).
More specifically, the instrument device 100 includes a display board 101 having an opening 101a, a liquid crystal panel 103 visibly arranged through the opening 101a, and a backlight unit (not shown) of the liquid crystal panel 103. A circuit board 105 connected to the liquid crystal panel 103, and a holding body 107 for holding the circuit board 105.

Then, on the surface of the display board 101, the conductive printing layer 109 arranged along the opening 101a, the connecting member 111 connecting the conductive printing layer 109 to the reference voltage terminal (earth terminal) 105a of the circuit board 105, and the display board 101. It is an instrument device including a light-shielding portion 113 provided in a region along the edge of the opening 101a.
Further, the conductive printing layer 109 is formed of a conductive ink containing a conductive substance such as aluminum flakes, and the connecting member 111 is composed of three members made of a metal material.
The reference voltage terminal 105a is formed of a Z-shaped metal on-board contact, and the light-shielding portion 113 is made of black ink.

Further, as shown in FIGS. 9A and 9B, the non-black printing film prevents static electricity accumulated in the black printing film 133b on the back surface of the dial 131 from flowing into the liquid crystal display panel (not shown). A display board 130 for vehicle instruments, which can be suppressed by 135 and can suppress the occurrence of inappropriate display on the display panel, has also been proposed (see, for example, Patent Document 2).
The display plate 130 includes a dial 131, an opening 131a for a liquid crystal display panel provided on the dial 131, a black printing film 133a provided on the surface of the dial 131 for light-shielding printing, and a back surface of the dial 131. The non-black printing film 135 provided in the peripheral portion surrounding the opening 131a and the black printing film 133b which is light-shielding printing provided in a region other than the region provided with the non-black printing film 135 on the back surface of the dial 131. It is a provided display board.

A liquid crystal display panel (not shown) is arranged in close contact with the display plate 130 in the vicinity of the opening 131a on the back surface side of the dial 131.
Further, the black printing film 133a and 133b are composed of black ink containing conductive carbon black and an insulating material, and the non-black printing film 135 does not have a black printing film containing carbon black (a printing film containing carbon black). It is composed of a white printing film).

Japanese Unexamined Patent Publication No. 2016-205979 Japanese Unexamined Patent Publication No. 2015-05502

However, in the case of the instrument device 100 disclosed in Patent Document 1, special members such as a conductive printed layer 109, a connecting member 111, and a reference voltage terminal 105a are required for antistatic property. Moreover, since it is necessary to provide these members at accurate positions, a predetermined space is required, and there is a problem that the structure of the instrument device 100 tends to be complicated and large in size.
Further, in the case of the instrument device 100 disclosed in Patent Document 1, in order to prevent light leakage from the backlight unit, it is necessary to further provide a light-shielding portion 113 in addition to the conductive printing layer 109. There has been a problem that the structure of the instrument device 100 tends to be more complicated and larger.

On the other hand, in the case of the display plate 130 of the vehicle instrument disclosed in Patent Document 2, a non-black printing film 135 is provided on the back surface of the dial 131 near the opening 131a for the liquid crystal display panel 133, and the dial is provided. It was necessary to provide a black printing layer on the front surface of the 131 on the back surface side facing the portion where the non-black printing film 135 was provided in order to secure the light-shielding property.
Therefore, not only the structure of the display board 130 is complicated, but also the manufacturing process is complicated and the manufacturing cost is increased.
Further, only a non-black printing film (white printing film) 135 is provided in the vicinity of the opening 131a of the dial 131 for the liquid crystal display panel 133, and light leaks from the backlight for the liquid crystal display panel. There was also a problem that it was easy to occur.

The present invention has been made in view of such problems, and even if the simple structure omits the ground member, it is caused by malfunction of the display element due to static electricity, light leakage from the inside of the display device, and the like. It is an object of the present invention to provide an antistatic display device capable of preventing deterioration of display quality in a well-balanced manner, and a vehicle instrument equipped with the antistatic display device.

The antistatic display device of the present invention has at least a display element, a light shielding plate having a light transmitting region and a light shielding portion, and a lens member from below along the vertical direction.
The antistatic display is characterized in that the light shielding portion has a light shielding layer having a transmission density of 6 or more and a resistivity of 5 × 10 ¹² Ω · cm or more as measured by a Macbeth densitometer. It is a device.
With such a configuration, even if the structure is simple such that the ground member is omitted, it is possible to prevent the inflow of static electricity from the lens member side to the display element and effectively prevent malfunction.
Further, even when a predetermined light source is arranged on the back side opposite to the emission surface of the display image in the display element, light leakage to the lens member side is balanced by the predetermined light shielding layer. It can be suppressed well.

Further, in constructing the antistatic display device of the present invention, the light shielding plate includes at least a first light shielding layer, a translucent resin base material, and a second light shielding layer from the display element side. It is preferably a multi-layer structure.
That is, at least the first light shielding layer provided on one surface of the translucent resin base material on the side of the display element and the second light shielding layer provided on the other surface of the translucent resin base material. It is preferable to have a multi-layer structure including.
With such a configuration, the inflow of static electricity from the lens member side to the display element and the light leakage from the back surface side of the display element to the lens member side can be suppressed by a plurality of light shielding layers. Further, better light shielding property can be obtained.

Further, in constructing the antistatic display device of the present invention, it is preferable that either the first light shielding layer or the second light shielding layer is a solvent type shielding composition or a photocurable shielding composition.
With such a configuration, for example, in the case of a solvent-type shielding composition, the inclusions in the composition tend to appear on the surface after curing, so that the surface roughness tends to be rougher than that of the photocurable shielding composition.
On the other hand, in the case of a photocurable shielding composition, curing is completed quickly by light irradiation, so that the inclusions in the composition are confined inside and the surface roughness is smoother than that of the solvent-based shielding composition. Prone. Moreover, due to the difference in the curing mechanism described above, the resistivity of the photocurable shielding composition tends to be higher than that of the solvent-based shielding composition.
Therefore, by constituting either the first light shielding layer or the second light shielding layer with the solvent type shielding composition or the photocurable shielding composition, the solvent type shielding composition and the photocuring type shielding composition can be obtained. It is possible to provide an antistatic display device having more excellent antistatic properties, light shielding properties, and the like by utilizing the unique characteristics of each.

Further, in constructing the antistatic display device of the present invention, it is preferable that the shortest distance between the light shielding plate and the lens member exceeds 10 mm.
When the shortest distance between the light shielding plate and the lens member is not more than a predetermined distance, the influence of static electricity on the lens member side may exceed the function of suppressing the inflow of static electricity by the predetermined light shielding layer. Therefore, in order to prevent this, it is preferable that the shortest distance between the light shielding plate and the lens member exceeds 10 mm.

Further, in constructing the antistatic display device of the present invention, it is preferable that the shortest distance between the light shielding plate and the display element is a value within the range of 0.1 to 3 mm.
When the light shielding plate and the display element are in contact with each other, there is a possibility that the risk of static electricity flowing into the display element, which is intended to suppress the inflow by the light shielding layer of the present invention, may increase. On the other hand, if the shortest distance between the light shielding plate and the display element is too wide, the light from the light source may easily leak to the lens member side. Therefore, in order to prevent these, it is preferable to set the shortest distance between the light shielding plate and the display element to a value within a predetermined range.

Further, in constructing the antistatic display device of the present invention, it is preferable that the translucent resin base material is a base material containing a polycarbonate resin or a polyester resin as a main component.
Both the polycarbonate resin and the polyester resin are excellent in transparency, durability and adhesion of the light shielding layer, and in particular, the polycarbonate resin is suitable because it is excellent in durability and adhesion of the light shielding layer. be.

Further, in constructing the antistatic display device of the present invention, it is preferable that the display element is a liquid crystal display element, and a light source is provided below the liquid crystal display element along the vertical direction.
With this configuration, a liquid crystal display device, which is a general-purpose product as a display element, can be used together with a predetermined light source provided on the back side of the liquid crystal display element as a display element, and is relatively inexpensive and stable, and antistatic. A display device can be provided.

Further, another aspect of the present invention is a vehicle instrument, characterized in that any of the above-mentioned antistatic display devices is provided adjacent to an analog instrument, a digital instrument, or one of the instruments.
With this configuration, even with a simple structure, it is possible to prevent malfunction of the display element due to static electricity and deterioration of display quality due to light leakage from the inside of the display device in a well-balanced manner. Vehicle instruments equipped with a display device can be provided.
If there is a guide ring that constitutes a part of the vehicle instrument, static electricity is scattered by partially overlapping the guide ring with the first light shielding layer and / or the second light shielding layer. It can also be an easy route. Therefore, by making the overlapping contact in this way, it is possible to more effectively prevent the malfunction of the antistatic display device in the vehicle instrument due to static electricity.

1 (a) is a front view of the antistatic display device, and FIG. 1 (b) is a partial front view showing an enlarged display element and its peripheral portion (M portion) in FIG. 1 (a). 1 (c) is a cross-sectional view of the M portion in FIGS. 1 (a) to 1 (b) cut along a line PP in FIG. 1 (b), and FIG. 1 (d) is a light shielding plate. It is sectional drawing along the thickness direction of a part (Q part of FIG. 1C). 2A is a front view of the lens member, FIG. 2B is a front view of the light shielding plate, and FIG. 2C is a front view of a housing for mounting a light source, a display element, a speedometer, and the like. 2 (d) is a cross-sectional view of the light shielding plate cut in the thickness direction. FIG. 3A is a diagram provided for explaining the shortest distance g2 with the lens member when the shape of the lens member is special, and FIGS. 3B and 3C are FIGS. 3 (c). a) It is sectional drawing along the PP line in a). 4 (a) is a diagram provided for explaining the light shielding plate of the modified example 1 and the light shielding plate of the modified example 2, and FIG. 4 (b) is a diagram taken along the line PP in FIG. 4 (a). 4 (c) is a cross-sectional view of the light shielding plate of the modified example 1 along the above, and FIG. 4 (c) is a cross-sectional view of the light shielding plate of the modified example along the line PP in FIG. 4 (a). FIG. 5A is a plan view provided for explaining the light shielding plate of the modified example 3, and FIG. 5B is a plan view provided for explaining the light shielding plate of the modified example 4. FIG. 6 is a diagram provided for explaining the relationship between the transmission density and the relative transparency value of the light shielding plate. FIG. 7 is a diagram provided for explaining the relationship between the resistivity and the relative antistatic property value of the light shielding plate. 8 (a) is a front view provided for explaining the instrument device disclosed in Patent Document 1, and FIG. 8 (b) is an instrument device along the PP line in FIG. 8 (a). It is a partial cross-sectional view of. 9 (a) is a plan view of the front surface side of the display plate of the vehicle instrument disclosed in Patent Document 2, and FIG. 9 (b) is a plan view of the back surface side of the display plate.

Hereinafter, embodiments of the present invention will be specifically described. In addition, each figure used for explanation is merely shown schematically to the extent that the present invention can be understood. Further, in each of the figures used for the description, the same components may be designated with the same reference numerals and the description thereof may be omitted.

[First Embodiment]
An embodiment of the antistatic display device 10 of the present invention will be described by taking a liquid crystal display device as an example.
That is, in the first embodiment, as shown in FIGS. 1 (a) to 1 (d) and FIGS. 2 (a) to 2 (d), at least the light source 11 and the display element 13 are described from below along the vertical direction. An antistatic display device 10 having a light shielding plate 19 having a light transmitting region 15 and a light shielding portion 17 and a lens member 21, a transmission density measured by a Macbeth densitometer on the light shielding portion 17. The antistatic display device 10 is characterized by having a light shielding layer 23 having a resistance of 6 or more and a resistance of 5 × 10 ¹² Ω · cm or more.
Hereinafter, each component and the like of the antistatic display device 10 will be specifically described.

1. 1. Light source and display element (1) When the light source display element 13 is a liquid crystal display element, a light source 11 for displaying a predetermined image is arranged on the back side of the display element 13.
The size, number, emission intensity, etc. of the light source 11 of the display element 13 can be appropriately changed according to the display area, etc. of the display element 13, but as an example, as shown in FIG. 2C, Six light sources 11 are regularly arranged in a grid pattern in a plane and at predetermined intervals inside the recess 33a on which the display element 13 is mounted in the housing 33.
Further, since the light source 11 is typically small in size, consumes less power, and has high emission luminance, it is preferable to use a light emitting diode.
Further, a flat plate-shaped light guide plate or a light diffusing plate may be arranged on the back surface of the display element 13, and a light emitting diode or a backlight (fluorescent lamp) may be arranged on the side end portion thereof.

The light source 11 arranged on the back surface side of the display element 13 is the main target as the light source in consideration of the light-shielding property in the antistatic display device 10.
However, if there is a light source 31 for visual display such as a speedometer, a tachometer, a seatbelt warning light, etc., which are various instruments, it can also be included.
The light source 31 such as the speedometer is provided at an appropriate position of the housing 33 corresponding to each position of the speedometer or the like.
Further, even when the light source 31 is provided, it is preferably composed of a light emitting diode because of its small size, low power consumption, and high emission luminance.

(2) Display element The display element 13 is a component for displaying a predetermined image according to the design of the antistatic display device 10, and is typically a liquid crystal display element or an organic EL element.
Therefore, more specifically, it is a component that displays various arbitrary information such as mileage, fuel consumption, residual fuel, gear type, etc., and the display area thereof is the light transmission area 15 of the light shielding plate 19. It is fixed to the back surface of the light shielding plate 19 above the light source 11 so as to be visible from the opening 15a.
Further, as an example of the display element 13, a liquid crystal display element having a rectangular planar shape or the like is suitable.
Further, it is preferable to provide a diffuser plate (not shown) between the light source 11 and the display element 13 so that the light emitted from the light source 11 can be uniformly applied to the entire back surface of the display element 13.

The display element 13 may come into contact with a part (periphery or edge) of the back surface of the light shielding plate 19, but the shortest distance g1 between the light shielding plate 19 and the display element 13 (FIG. 1 (c)). )) Is preferably set to a value in the range of 0.1 to 3 mm.
The reason for this is that when the light shielding plate 19 and the display element 13 are in contact with each other, there is an increased risk that static electricity, which is intended to suppress inflow by the light shielding layer 23, will flow into the display element 13, which is the object of the present invention. This is because the effect of doing so may not be obtained.
On the other hand, if the shortest distance g1 between the light shielding plate 19 and the display element 13 is too wide, the light of the light source 11 leaks to the lens member 21 side.
Therefore, from these facts, in this embodiment, it is more preferable to set the shortest distance g1 between the light shielding plate 19 and the display element 13 to a value within the range of 0.2 to 1 mm, more preferably 0.25 to 0.4 mm. It is more preferable to set the value within the range of.

2. 2. Light shielding plate (1) Main function The light shielding plate 19 is a constituent member having at least a light transmitting region 15 and a light shielding portion 17.
Here, the light transmission region 15 is an region arranged in an arbitrary region according to the design of the opening portion 15a of the display element 13 or the antistatic display device 10.
Further, the light transmission region 15 is specifically an arbitrary region for displaying a blinker display area, a warning display area when the seat belt is not fastened, a warning display area when the remaining amount of gasoline is low, and the like.
On the other hand, the light shielding unit 17 prevents light from leaking upward from the light shielding plate 19 from the light source 11 or the light source 31 below the light shielding plate 19 in the region other than the light transmitting region 15, and the antistatic display. This is an area for improving the display quality of the device 10.
Further, the light shielding plate 19 is a constituent member for suppressing a malfunction of the display element 13 caused by static electricity extending to the antistatic display device 10, typically, static electricity extending from the lens member 21 side to the display element 13. Is.
As a typical configuration of the light shielding plate 19 having the light transmitting region 15 and the light shielding portion 17, a light shielding layer 23 is provided in a predetermined region of the translucent resin base material 19a to form the light shielding portion 17. However, the portion where the light shielding layer 23 is not provided is formed as the light transmitting region 15.

(2) Light shielding layer In order to prevent light leakage and malfunction of the display element 13, the light shielding plate 19 has a light shielding unit 17 having a transmission density of 6 or more measured by a Macbeth densitometer and a transmission density of 6 or more. It is characterized by having a light shielding layer 23 having a resistivity of 5 × 10 ¹² Ω · cm or more.
The reason for this is that the transmittance of the light shielding layer 23 measured by the Macbeth densitometer is set to a value of 6 or more, which corresponds to a considerable correlation with the light of a predetermined wavelength from the light source 11. This is because the light transmittance can be set to a value of 0.0001% or less, and as a result, good light-shielding property (prevention of light leakage) can be obtained.
Therefore, the transmission density measured by the Macbeth densitometer of the light shielding layer 23 is more preferably set to a value in the range of 6.1 to 8, and further preferably set to a value in the range of 6.2 to 7. ..
Here, in FIG. 6, the horizontal axis is the transmission density, and the vertical axis is the relative value (⊚: 5, 〇: 3, Δ: 1, ×: 0) of the see-through evaluation, which is the evaluation 3-1 in the examples described later. As a graph, the relative value is graphed. Further, T1 is a graph relating to a light shielding plate 19 having light shielding layers 23 provided on both sides of the translucent resin base material 19a, and T2 is a graph relating to a light shielding layer 23 provided on one side of the translucent resin base material 19a. It is a graph about the light shielding plate 19.
According to FIG. 6, it can be understood that the relative value of see-through gradually increases as the permeation concentration increases. It can be understood that even if the transmission density is the same, the relative value of the transparency evaluation is better when the light shielding layers 23 are provided on both sides of the translucent resin base material 19a.

Further, the resistivity of the light shielding layer 23 should have a value of 5 × 10 ¹² Ω · cm or more, even if it is a simple structure in which the ground member is omitted, if the resistivity is such a value. This is to prevent static electricity from flowing into the display element 13 from the side of the lens member 21 and effectively prevent malfunction.
More specifically, since the resistance of the light shielding layer 23 is equal to or higher than a predetermined value even if the ground member such as the GND plate is omitted and not particularly provided, the charge transfer speed of static electricity is delayed and the lens member side. This is because even if static electricity is generated, it is considered that the static electricity can be prevented from reaching the display element 13.
However, if the resistivity of the light shielding layer 23 becomes excessively large, the charge transfer rate of static electricity may become excessively slow, and the antistatic property may be insufficient.
Therefore, it is more preferable to set the resistivity of the light shielding layer 23 in the range of 1 × 10 ¹³ to 1 × 10 ¹⁶ Ω · cm, and it is more preferable to set the resistivity in the range of 1 × 10 ¹⁴ to 5 × 10 ¹⁵ Ω · cm. It is more preferable to set the value.
The resistivity is a value measured by the four-terminal method, and specific measurement conditions will be described in detail in Example 1 described later.
Here, in FIG. 7, the resistivity (Ω · cm) is defined as the horizontal axis (logarithmic axis), and the relative values (⊚: 5, 〇: 3, Δ:) of the antistatic property evaluation, which is the evaluation 4 in the examples described later, are shown in FIG. 1, ×: 0) is set as the vertical axis, and the values are graphed. Further, U1 is a graph relating to a light shielding plate 19 in which the light shielding layers 23 are provided on both surfaces of the translucent resin base material 19a.
According to FIG. 7, it can be understood that the antistatic property is improved as the resistivity is increased, and the resistivity rises sharply within the range of 1 × 10 ¹² to 1 × 10 ¹³ Ω · cm. Further, it can be understood that the antistatic property gradually increases in the range of 1 × 10 ¹³ to 1 × 10 ¹⁴ Ω · cm, and then the increase in resistivity is saturated.

Further, as shown in FIGS. 1 (d) and 2 (d), the light shielding plate 19 is provided on the translucent resin base material 19a and the first surface of the translucent resin base material 19a. It is also preferable to have a multilayer structure including the light shielding layer 23a and the second light shielding layer 23b provided on the second surface of the translucent resin base material 19a.
That is, on one side of the translucent resin base material 19a, a first light shielding layer 23a having a transmission density of 6 or more and a resistivity of 5 × 10 ¹² Ω · cm or more as measured by a Macbeth densitometer is formed. A multilayer (translucent resin base material 19a) including a second light shielding layer 23b having a transmission concentration of 6 or more and a resistivity of 5 × 10 ¹² Ω · cm or more is provided on the opposite surface thereof. It is also preferable to include a three-layer structure).
In the case of a three-layer structure, the transmission concentration and resistivity of the first light shielding layer 23a and the second light shielding layer 23b may be the same or different from each other.

(3) Translucent Resin Substrate The translucent resin substrate 19a is usually preferably a film-like substrate made of a resin material having a visible light transmittance of 80% or more.
The reason for this is that a translucent material made of such a film-like substrate can transmit the image display light emitted from the display element 13 without excessively reducing the visibility. Further, in the case of a film-like substrate, the light shielding layer 23 can be easily formed, the thickness can be made uniform, and more effective light shielding properties can be obtained.
Therefore, the translucent resin base material 19a is more preferably made of a resin material having a visible light transmittance of 90% or more, and is a film-like base material made of a material having a visible light transmittance of 95% or more. It is more preferable to do so.

Further, as the more specific translucent resin base material 19a, it is preferable that the base material contains a polycarbonate resin or a polyester resin as a main component.
The reason for this is that both the polycarbonate resin and the polyester resin are excellent in transparency, durability, and adhesion of the light shielding layer 23.
In particular, the polycarbonate resin is particularly preferable because it is excellent in transparency, durability, and adhesion of the light shielding layer 23.
On the other hand, although the polyester resin is more excellent in transparency than the polycarbonate resin, the adhesion of the light shielding layer 23 may be inferior. In such a case, an easily adhesive polyester resin may be used. .. Further, the polyester resin has an advantage that it is relatively inexpensive and has high versatility.

Further, the thickness of the translucent resin base material 19a can be set to a predetermined thickness according to the design of the antistatic display device 10 in consideration of strength, cost and the like, but the thickness is usually 10 to 1000 μm. It is preferable that the value is within the range of.
The reason for this is that when the thickness of the translucent resin base material 19a is 10 μm, the handleability and mechanical strength when forming the light shielding layer 23 may be significantly deteriorated.
On the other hand, if the thickness of the translucent resin base material 19a exceeds 1000 μm, on the contrary, the handleability and antistatic property when forming the light shielding layer 23 may deteriorate.
Therefore, the thickness of the translucent resin base material 19a is more preferably set to a value in the range of 50 to 750 μm, and further preferably set to a value in the range of 100 to 500 μm.

(4) Constituent Material of Light-Shielding Layer As the constituent material of the light-shielding layer 23, a solvent-type shielding composition or a photocurable shielding composition is usually preferable.
Here, the solvent-type shielding composition includes, for example, a thermoplastic resin, a colorant for controlling the permeation concentration and the resistivity, and a metal oxide for controlling the resistivity more finely and relatively high. , Are preferably included.

Further, the photocurable shielding composition includes, for example, a photocurable resin, a colorant for controlling the transmission concentration and resistivity, and a metal oxide for finely controlling the resistivity. It is preferable to configure it.
The photocurable resin includes a predetermined photocurable monomer or oligomer (typically an acrylic monomer or oligomer), and the thermoplastic resin or thermoplastic oligomer as a viscosity modifier (typically a urethane-based monomer). It can be composed of a monomer (monomer or oligomer), and further, a photoinitiator and the like.

However, in the stage before forming the light shielding layer 23, it is preferable that both the solvent-type shielding composition and the photocurable shielding composition contain a predetermined organic solvent because they have good screen printability and storage stability.
Then, it is preferably a liquid material having a viscosity of 100 to 1000000 mPa · S at room temperature (25 ° C.).

Further, as the thermoplastic resin as a constituent material of the light shielding layer 23, usually, a phenoxy resin, a polyurethane resin, a polyester urethane resin, a butyral resin, an acrylic resin, a polyimide resin, a polyamide resin, a vinyl chloride resin, a vinyl acetate resin, and the like. It is preferable to contain at least one selected from copolymers having them as structural units.
Further, among these, one or more selected from acrylic resin, polyurethane resin, vinyl chloride resin and vinyl acetate resin is preferable, and acrylic resin and vinyl chloride-vinyl acetate copolymer resin are used. It is more preferable to use in combination.

Known pigments can be used as the colorant, for example, titanium oxide, zinc oxide, lead oxide and zinc sulfide as the white pigment, aluminum paste as the silver pigment, and carbon as the black pigment. It is preferable to contain at least one selected from black, azomethine azo pigments, and perylene pigments, respectively.
Among these, it is more preferable to use carbon black because it is possible to form the light shielding layer 23 having particularly excellent concealing property, and further, since the transmission concentration and resistivity measured by the Macbeth densitometer can be accurately controlled. ..

Further, among various carbon blacks, it is preferable that the amorphous carbon material has no crystal structure and is highly reactive, that is, hydrogenated amorphous carbon having a dangling bond with hydrogen at the end.
The reason for this is that such hydrogenated amorphous carbon easily reacts with various resins, and a considerable concealment property and a black appearance can be obtained with a relatively small amount of compounding.
Therefore, as an example of hydrogenated amorphous carbon, STSA (statistical thickness specific surface area) based on the gas adsorption method specified in JIS K 6217-7 is 30 to 60 m ² / g, DBP (phthalic acid dibutyl ester). It is more preferable to use hydrogenated amorphous carbon having an absorption amount of 30 to 60 ml / 100 g.

The content of the colorant (carbon black, etc.) is appropriately determined in consideration of the resistance and shielding property (transmission concentration, etc.) of the obtained light shielding layer 23, and the combined amount of the metal oxide. Usually, the value is preferably in the range of 1 to 30% by weight with respect to the total amount of the constituent materials of the light shielding layer 23 (in terms of solid content, the same applies hereinafter).
The reason is that when the content of the colorant is less than 1% by weight, the resistivity and the shielding property (transmission concentration, etc.) of the obtained light shielding layer 23 are remarkably lowered even if a considerable amount of the metal oxide is used in combination. This is because there are cases.
On the other hand, if the content of the colorant exceeds 30% by weight, not only is it difficult to disperse uniformly, but also the resistivity of the obtained light shielding layer 23 may be excessively low.
Therefore, it is more preferable that the content of the colorant is in the range of 3 to 12% by weight with respect to the total amount of the constituent material of the light shielding layer 23, and the content is in the range of 5 to 20% by weight. It is more preferable to set the value.

Further, as the metal oxide, a metal-based composite oxide is preferable in consideration of obtaining insulating properties and light-shielding properties.
Examples of such metal-based composite oxides include Ti—Ni—Sb system, Fe—Zn, Fe—Zn—Ti system, Ti—Ba—Ni system, Co—Al system, and Co—Cr—Al. System, Ti-Co-Ni-Zn system, Co-Zn-Cr-Ti system, Co-Zn-Ni-Ti system, Ti-Cr-Sb system, Cr-Fe system, Fe-Zn-Cr system, Fe- Examples thereof include Cr type, Co—Fe—Cr type, Cu—Cr—Mn type and the like.
That is, a metal oxide composed of two or more kinds of metal elements selected from iron, copper, chromium, nickel, antimony, manganese, cobalt, aluminum, titanium, zinc and the like can be mentioned, and one or more of these should be used. Can be done.
Further, among these metal oxides, since better light-shielding properties can be obtained and a desired resistivity can be easily obtained, a black film can be formed when a cured film is formed. Fe-Cr system, Co- It is more preferable to use a Fe—Cr-based or Cu—Cr—Mn-based composite oxide.

Further, the content of the metal oxide is appropriately determined in consideration of the resistance and shielding property (transmission concentration, etc.) of the obtained light shielding layer 23, and the combined amount of the colorant (carbon black, etc.). Usually, it is preferably set to a value in the range of 10 to 60% by weight with respect to the total amount of the constituent materials of the light shielding layer 23.
The reason is that when the content of the metal oxide is less than 10% by weight, the resistivity and the shielding property (transmission concentration, etc.) of the obtained light shielding layer 23 are remarkably lowered even if a considerable amount of carbon black or the like is used in combination. This is because it may be done.
On the other hand, if the content of the metal oxide exceeds 60% by weight, not only is it difficult to disperse uniformly, but also the resistivity of the obtained light shielding layer 23 may be excessively low.
Therefore, it is more preferable that the content of the metal oxide is in the range of 15 to 55% by weight, more preferably in the range of 20 to 50% by weight, based on the total amount of the constituent materials of the light shielding layer 23. It is more preferable to set the value to.

Further, when the content of the metal oxide is used in combination with a colorant (carbon black or the like), it is also preferable to determine the content in consideration of the combined amount.
That is, the content of the metal oxide is preferably set to a value in the range of 110 to 500 parts by weight with respect to 100 parts by weight of the colorant.
The reason is that when the content of the metal oxide is less than 110 parts by weight, the resistivity and the shielding property (transmission concentration, etc.) of the obtained light shielding layer 23 are remarkably lowered even if a considerable amount of carbon black or the like is used in combination. This is because it may be done.
On the other hand, if the content of the metal oxide exceeds 500 parts by weight, not only is it difficult to disperse uniformly, but also the resistivity of the obtained light shielding layer 23 may be excessively low.
Therefore, the content of the metal oxide is more preferably set to a value in the range of 150 to 450 parts by weight, and set to a value in the range of 200 to 400 parts by weight with respect to 100 parts by weight of the colorant. Is more preferable.

(5) Method for Forming Light Shielding Layer When the light shielding layer 23 is a single layer, it can be typically obtained by the following method.
First, a photocurable shielding composition or a solvent-based shielding composition is applied onto the translucent resin base material 19a by, for example, a screen printing method.
Next, when the material used is a solvent-type shielding composition, the light-shielding layer 23 is formed by curing the coating film by heating, and in the case of a photocurable shielding composition, by irradiating light of a predetermined wavelength. can do.
The thickness of the light shielding layer 23 can be controlled within a desired range by appropriately adjusting the screen mesh used in the screen printing method, the thickness of the screen, the solid content concentration, the viscosity of the shielding composition, and the like. ..
That is, the thickness of the light shielding layer 23 is preferably set to a value in the range of 1 to 30 μm, more preferably set to a value in the range of 3 to 15 μm, and set to a value in the range of 5 to 8 μm. Is more preferable.
Conversely, even if the light shielding layer 23 is a thin film having a thickness of about 5 to 8 μm, a good balance between good antistatic property (resistivity) and light shielding property can be achieved.

On the other hand, when the light shielding layer 23 is a multilayer including the first light shielding layer 23a and the second light shielding layer 23b with the translucent resin base material 19a interposed therebetween, it is typically obtained by the following method. be able to.
First, either the photocurable shielding composition or the solvent-based shielding composition is selected and applied onto the translucent resin base material 19a by, for example, a screen printing method.
Next, when the material used is a solvent-type shielding composition, the coating film is cured by heating, and in the case of a photocurable shielding composition, by irradiation with light of a predetermined wavelength, the first light shielding is first performed. The layer 23a is formed.
Next, either the photocurable shielding composition or the solvent-based shielding composition is selected and applied to the opposite surface of the translucent resin base material 19a by, for example, a screen printing method.
Next, when the material used is a solvent-type shielding composition, the coating film is cured by heating, and when the material is a photocurable shielding composition, it is irradiated with light of a predetermined wavelength to cure the coating film, thereby the second light-shielding layer 23b. This allows the multi-layered light shielding layer 23 to be formed.

Even in the case of multiple layers, the viscosity and solidity of the composition used in the screen printing method are the same for each thickness of the first light shielding layer 23a and the second light shielding layer 23b, as in the case of the single layer. It can be controlled within a desired range by appropriately adjusting the component concentration and the like.
That is, the total thickness of the first light shielding layer 23a and the second light shielding layer 23b is preferably set to a value within the range of 1 to 30 μm, and more preferably set to a value within the range of 3 to 15 μm. It is more preferable to set the value within the range of about 8 μm.

In addition, in the case of a multilayer including the first light shielding layer 23a and the second light shielding layer 23b, when both are composed of the solvent type shielding composition, the layer to be formed later is affected by the solvent of the layer formed first. Therefore, the quality of the light shielding layer 23 may not be preferable.
Therefore, if one of the first light shielding layer 23a and the second light shielding layer 23b is composed of the solvent type shielding composition and the other is composed of the photocurable shielding composition, the solvent type shielding composition is used first. , The influence of the solvent can be reduced.

Further, in the case of the solvent-type shielding composition, since the inclusions in the composition tend to appear on the surface after curing, the surface roughness may be rougher than that of the photocurable shielding composition.
On the other hand, in the case of the photocurable shielding composition, the curing is completed quickly by light irradiation, so that the inclusions in the composition are confined inside and the surface roughness is smoother than that of the solvent-based shielding composition. In many cases. Moreover, due to the difference in the curing mechanism described above, the resistivity of the solvent-type shielding composition is often higher than that of the photocurable shielding composition.
Therefore, it is also preferable to form the single-layer or multi-layered light-shielding layer 23 by utilizing the predetermined difference between the two characteristics.

3. 3. Lens member The lens member 21 is a member that makes it easy for the driver to see the display displayed on the display element 13, and also has a function of protecting the light shielding plate 19, the needle of the speedometer, the tachometer, and the like. be. Therefore, the lens member 21 may or may not have a magnifying function, and may be arbitrary depending on the design. However, excellent durability is a requirement.

The lens member 21 can be made of any suitable material, but is usually mainly composed of an acrylic resin (MMA resin), a polycarbonate resin, or a polyester resin because of its excellent transparency and mechanical strength. It is preferable that the member is.
Of these, acrylic resin (MMA resin) is particularly preferable because it is excellent in weather resistance and versatility, and can be easily processed into a desired form by injection molding or the like.

Further, the lens member 21 may be a plate-like object parallel to the surface of the light shielding plate 19 as shown in FIG. 1 (c), or may be a light shielding material as shown in FIG. 3 (b). It may be a plate-like object that is not parallel to the surface of the plate 19, or has a curved surface as shown in FIG. 3 (c).
That is, it is preferable that the lens member 21 has various shapes according to the mode of various vehicle devices in which the lens member 21 is used.

As shown in FIG. 1 (c), it is preferable that the shortest distance g2 between the light shielding plate 19 and the lens member 21 exceeds 10 mm.
The reason for this is that when the shortest distance g2 between the light shielding plate 19 and the lens member 21 is a close distance of 10 mm or less, the influence of static electricity on the lens member 21 side exceeds the static electricity inflow suppression function of the light shielding layer 23 of the present invention. This is because there is a possibility that the influence of static electricity cannot be reduced.
Although it is preferable that the shortest distance g2 exceeds 10 mm, the upper limit thereof is preferably determined in consideration of the thickness required for the antistatic display device 10, the legibility of the display, and the like.
Therefore, the light shielding plate 19 and the shortest distance g2 are more preferably set to a value within the range of 11 to 20 mm, and further preferably set to a value within the range of 12 to 15 mm.

[Second Embodiment]
In the antistatic display device 10 of the first embodiment, the light shielding plate 19 is composed of a three-layer structure of a translucent resin base material 19a, a first light shielding layer 23a, and a second light shielding layer 23b. The configuration of the light shielding plate 19 is not limited to this.
The second embodiment is a modification in which the layer structure of the light shielding plate 19 is different from that of the first embodiment.
Specifically, FIG. 4 shows two modified examples of the light shielding plate 19b of the modified example 1 and the light shield plate 19c of the modified example 2.

Here, the light shielding plate 19b of the first modification shown in FIG. 4B has a two-layer structure of a translucent resin base material 19a and one light shielding layer 23 provided on one of the main surfaces thereof. (This structure may be referred to as a single layer.).
By forming the two-layer structure in this way, the light shielding plate 19b can be formed by one-time application, one-time heat treatment, or one-time light irradiation, which reduces the number of steps and is extremely difficult in manufacturing. This is because it is advantageous.
Further, by adopting such a two-layer structure, the total thickness of the light shielding plate 19b can be reduced, and the antistatic display device 10 and the vehicle instrument 30 including the antistatic display device 10 can be made thinner and lighter. ..

Further, the light shielding plate 19c of the second modification shown in FIG. 4C includes a translucent resin base material 19a, a first light shielding layer 23a provided on the first surface thereof, and a first surface. Four layers of a second light shielding layer 23b provided on the second surface which is the opposite surface, and a third light shielding layer 23c laminated on any of the first light shielding layer 23a and the second light shielding layer 23b. It is composed of a structure.
The third light shielding layer 23c also has a transmission concentration and a resistivity measured by a predetermined Macbeth densitometer, but the compounding composition of the shielding composition is different from that of the first light shielding layer 23a and the second light shielding layer 23b. Is preferable.
The reason for this is that by configuring in this way, the resistivity and light-shielding property of the light-shielding plate 19c can be controlled more finely, and the adhesion and mechanical strength of the light-shielding layer 23 itself can be controlled in accordance with various vehicle devices. This is because it can also be enhanced.

[Third Embodiment]
In the antistatic display device 10 of the first embodiment, the light shielding layer 23 is provided on the entire surface other than the light transmitting region 15 of the light shielding plate 19, but the light shielding layer 23 is the light transmitting of the light shielding plate 19. It may not be provided on the entire surface other than the region 15, but may be partially provided in a necessary region including the periphery of the opening 15a which is the light transmission region 15.
The third embodiment is a modification in which the region provided with the light shielding layer 23 is different from that of the first embodiment.
Specifically, FIG. 5 shows two modified examples of the light shielding plate 19d of the modified example 3 and the light shield plate 19e of the modified example 4.

Here, the light shielding plate 19d of the modification 3 shown in FIG. 5A is provided with a band-shaped light shielding layer 23 having a width d along the opening 15a which is a light transmitting region 15.
The width d is preferably set to a dimension having a ratio of, for example, about 0.5 to 1 with respect to the width of the opening 15a which is the light transmission region 15.
The reason for this is that by configuring in this way, the light shielding layer 23 having a predetermined width can be formed even with the minimum coating amount of the shielding composition, and by extension, the effects of predetermined antistatic property and light shielding property. This is because it can exert.

Further, the light shielding plate 19e of the modified example 4 shown in FIG. 5 (b) is an analog instrument and a digital instrument as the instrument region 32 shown in FIG. 1 (a) from the edge of the opening 15a which is the light transmission region 15. The light shielding layer 23 is provided in the range up to the planned installation area.
With this configuration, if there is a guide ring 32a constituting a part of the analog instrument and the digital instrument in the instrument region 32, the first light shielding layer 23a and the second light shielding layer 23b, or any of them. It can be overlapped with one of them and partially contacted.
More specifically, the width of the overlapping portion between the first light shielding layer 23a and the second light shielding layer 23b and the guide ring 32a is preferably set to a value within the range of 0.1 to 5 mm, and is preferably 0.3. The value is more preferably in the range of about 3 mm, and further preferably in the range of 0.4 to 2 mm.
Therefore, by forming the overlapping portion in this way, the static electricity whose movement speed has decreased can be scattered, and the malfunction caused by the static electricity in the antistatic display device 10 can be more effectively prevented.

[Fourth Embodiment]
In the fourth embodiment, as shown in FIG. 1, the antistatic display device 10 according to any one of the first to third embodiments described above is used as an analog instrument, a digital instrument, or one of the instruments. It is a vehicle instrument 30 characterized in that it is provided adjacent to the vehicle.
With such a vehicle instrument 30, even with a simple structure, it is possible to prevent malfunction of the display element 13 due to static electricity and deterioration of display quality due to light leakage from the inside of the display device in a well-balanced manner. A vehicle instrument 30 provided with an antistatic display device 10 can be provided.
Further, "equipped with an antistatic display device adjacent to the instrument" means that the antistatic display device and the instrument are provided in contact with each other or partially overlapped with each other in the horizontal direction. It should be noted that the case where the antistatic display device and the instrument are arranged apart from each other within 10 mm in the horizontal direction is also included.

Here, the analog instrument is not particularly limited as long as it is a known instrument that indicates vehicle information in an analog display, but for example, a speedometer having a pointer, a tachometer having a pointer, and a pointer are provided. At least one of an engine thermometer, a fuel gauge with a pointer, a distance meter with a pointer, a clock with a pointer, etc. is targeted.

The digital instrument is not particularly limited as long as it is a known instrument that shows vehicle information on a digital display. At least one of a digital display fuel gauge, a digital display distance meter, a digital display clock, a digital display seat belt warning light, and the like is targeted.

Hereinafter, the present invention will be described in more detail based on examples.
However, the shapes, dimensions, materials, measuring devices, and the like of the components and the like of the present invention described in the following description are merely suitable examples of the present invention. Therefore, the present invention is not limited to the following description without particular reason.

[Example 1]
1. 1. Formation of light-shielding film (1) Formation of first light-shielding layer First, in the preparation of the antistatic display device 10 shown in FIGS. 1 and 2, the translucent resin base material 19a is a polycarbonate substrate (panlite) having a thickness of 400 μm. PC-1151, manufactured by Teijin Limited) was prepared.
Next, the following compounding compositions (A) to (E) were uniformly mixed using a propeller agitator to prepare a solvent-type shielding composition (solvent composition 1 in Table 1).
(A1) Acrylic resin 100 parts by weight (A2) Vinyl chloride resin 10 parts by weight (B) Metal composite oxide (Co-Fe-Cr type) 90 parts by weight (C) Carbon black (hydrogenated amorphous carbon) 30 Parts by weight (D) Dispersant 5 parts by weight (E) Organic solvent 180 parts by weight

Then, using a 250 mesh screen printing plate made of polyester, the squeegee speed was 100 mm / sec. The obtained solvent-type shielding composition was screen-printed on one surface of the polycarbonate substrate under the condition that the squeegee printing pressure was 0.2 MPa.
Finally, it was dried by heating at 80 ° C. for 30 minutes using an oven to form a first light shielding layer 23a having a thickness of 10 μm, which was used as a first evaluation sample of the light shielding member.

(2) Formation of Second Light Shielding Layer A commercially available UV-curable shielding composition (Recure PF4200) containing carbon black and a metal oxide in an ultraviolet curable resin on one surface of the above-mentioned polycarbonate substrate. Series 92 black, manufactured by Jujo Chemical Co., Ltd., in Table 1, ultraviolet composition 1) was screen-printed in the same manner as the above-mentioned solvent-type shielding composition.
Next, using an exposure apparatus, ultraviolet rays were irradiated so that the integrated light amount was 400 mJ / cm ² , to form a second light shielding layer 23b having a thickness of 10 μm, which was used as a second evaluation sample of the light shielding member.

(3) Preparation of light-shielding member Further, a commercially available ultraviolet curable shielding composition (Recure PF4200 series 92 black, Jujo Chemical Co., Ltd.) is formed on the surface opposite to the surface of the above-mentioned polycarbonate substrate where the first light shielding layer 23a is located. In Table 1, the ultraviolet composition 1) was screen-printed in the same manner as the above-mentioned solvent-type shielding composition.
Next, using an exposure apparatus, ultraviolet rays are irradiated so that the integrated light amount becomes 400 mJ / cm ² , a second light shielding layer 23b having a thickness of 10 μm is formed, and a polycarbonate substrate is sandwiched between the first light shielding layer. A light-shielding member facing 23a was prepared and used as a third evaluation sample of the light-shielding member.

2. 2. Evaluation of light-shielding member (1) Evaluation 1: Permeation concentration The first evaluation sample of the obtained light-shielding member and the second evaluation sample of the light-shielding member were vertically evaluated using TR-924 (manufactured by Macbeth), which is a concentration measuring device. The incident light of a predetermined wavelength was applied to each of them, and the transmitted densities were measured and evaluated according to the following criteria. The obtained evaluation results are shown in Table 1.
⊚: The permeation concentration is a value of 6.2 or more.
〇: The permeation concentration is a value of 6.0 or more.
Δ: The permeation concentration is a value of 5.8 or more.
X: The permeation concentration is a value less than 5.8.

(2) Evaluation 2: Resistivity Set the applied voltage to 1000V for the first evaluation sample of the obtained light-shielding member and the second evaluation sample of the light-shielding member using a super-insulation meter (SM-8215, manufactured by HIOKI). The resistivity was measured by the 4-terminal method and evaluated according to the following criteria. The obtained evaluation results are shown in Table 1.
⊚: The resistivity is a value of 5 × 10 ¹³ Ω · cm or more.
〇: The resistivity is a value of 5 × 10 ¹² Ω · cm or more.
Δ: The resistivity is a value of 5 × 10 ¹¹ Ω · cm or more.
X: The resistivity is a value less than 5 × 10 ¹¹ Ω · cm.

(3) Evaluation 3: Sensory test on the light-shielding member For the third evaluation sample of the obtained light-shielding member, the items of "transparency" as evaluation 3-1 and "blackness" as evaluation 3-2 are as follows. A sensory test was conducted according to the evaluation conditions. The obtained evaluation results are shown in Table 1.

(Sheer)
⊚: No see-through is observed.
〇: Almost no see-through is observed.
Δ: A little see-through is observed.
X: Significant see-through is observed.

(Black)
⊚: The unmistakable blackness of other colors is visually recognized.
〇: Blackness with almost no other colors is visible.
Δ: Blackness with a slight amount of other colors is visible.
X: Blackness with remarkable mixing of other colors is visually recognized.

(4) Evaluation 4: Antistatic property (whitening test of LCD screen)
Using the obtained third evaluation sample of the light-shielding member, the antistatic display device shown in FIG. 1 was produced. Further, the width of the overlapping portion between the light shielding layer 23 and the guide ring 32a of the analog instrument is set to 1 mm.
Next, static electricity of 30 kV was applied to the lens member, the time during which the whitening phenomenon of the display element 13 (liquid crystal display element) occurred after the static electricity was applied was measured, and the antistatic property was evaluated according to the following criteria. .. Table 1 shows the evaluation results of the obtained antistatic properties.
⊚: No whitening phenomenon occurs, or within 1 second.
〇: The whitening phenomenon exceeds 1 second to within 10 seconds.
Δ: The whitening phenomenon exceeds 10 seconds to 120 seconds or less.
X: The whitening phenomenon exceeds 120 seconds.

[Example 2]
In Example 2, the antistatic display is the same as in Example 1, except that the solvent-type shielding composition (solvent composition 2 in Table 1) constituting the light shielding layer 23 is changed to the following compounding composition and compounding ratio. A device was created and the antistatic property was evaluated. The obtained evaluation results are shown in Table 1.
(A) Acrylic resin 100 parts by weight (B1) Metal composite oxide (Fe-Cr type) 50 parts by weight (B2) Metal oxide (titanium oxide) 30 parts by weight (C) Carbon black (hydrogenated amorphous carbon) 40 parts by weight (D) Dispersant 5 parts by weight (E) Organic solvent 180 parts by weight

[Example 3]
In Example 3, the same as in Example 1 except that a single layer (only the first light shielding layer 23a) was formed on the surface of the polycarbonate resin as the light shielding layer of the light shielding plate 19 by using the solvent composition 1. In addition, an antistatic display device was created and its antistatic properties were evaluated. The obtained evaluation results are shown in Table 1.

[Example 4]
In Example 4, the same as in Example 1 except that a single layer (only the second light shielding layer 23b) was formed on the back surface of the polycarbonate resin as the light shielding layer of the light shielding plate 19 by using the ultraviolet composition 1. In addition, an antistatic display device was created and its antistatic properties were evaluated. The evaluation results of the obtained sensory test are shown in Table 1.

[Comparative Example 1]
In Comparative Example 1, a composition for constructing a second light shielding layer 23b by changing the composition constituting the first light shielding layer 23a to a solvent-type shielding composition (solvent composition 3 in Table 1) having the following blending ratio. Was changed to a commercially available ultraviolet curable shielding composition (Recure UIM6200 series 92 black, manufactured by Jujo Chemical Co., Ltd., in Table 1, ultraviolet composition 2), and the same as in Example 1, the antistatic display device. Was prepared and the antistatic property was evaluated. The obtained evaluation results are shown in Table 1.
(A1) Acrylic resin 100 parts by weight (A2) Vinyl chloride resin 10 parts by weight (B) Metal composite oxide (Fe-Cr type) 60 parts by weight (C) Carbon black (hydrogenated amorphous carbon) 10 parts by weight (D) Dispersant 5 parts by weight (E) Organic solvent 180 parts by weight

[Comparative Example 2]
In Comparative Example 2, the composition constituting the first light shielding layer 23a is changed to a solvent-type shielding composition having the following blending ratio (solvent composition 4 in Table 1) to construct the second light shielding layer 23b. Was changed to an ultraviolet composition 2, and an antistatic display device was prepared in the same manner as in Example 1, and the antistatic property and the like were evaluated. The obtained evaluation results are shown in Table 1.
(A) Acrylic resin 100 parts by weight (B) Metal composite oxide (Co-Fe-Cr type) 80 parts by weight (C) Carbon black (hydrogenated amorphous carbon) 1 part by weight (D) Dispersant 5 parts by weight (E) 180 parts by weight of organic solvent

[Comparative Example 3]
In Comparative Example 3, the composition constituting the first light shielding layer 23a is changed to a solvent-type shielding composition having the following blending ratio (solvent composition 5 in Table 1) to construct the second light shielding layer 23b. Was changed to an ultraviolet composition 2, and an antistatic display device was prepared in the same manner as in Example 1, and the antistatic property and the like were evaluated. The obtained evaluation results are shown in Table 1.
(A) Acrylic resin 100 parts by weight (B) Metal composite oxide (Fe-Cr type) 40 parts by weight (C) Carbon black (hydrogenated amorphous carbon) 60 parts by weight (D) Dispersant 5 parts by weight (E) ) 180 parts by weight of organic solvent

[Comparative Example 4]
In Comparative Example 4, the composition constituting the first light shielding layer 23a is changed to a solvent-type shielding composition having the following blending ratio (solvent composition 6 in Table 1) to construct the second light shielding layer 23b. Was changed to an ultraviolet composition 2, and an antistatic display device was prepared in the same manner as in Example 1, and the antistatic property and the like were evaluated. The obtained evaluation results are shown in Table 1.
(A) Acrylic resin 100 parts by weight (B) Metal composite oxide (Co-Fe-Cr type) 5 parts by weight (C) Carbon black (hydrogenated amorphous carbon) 80 parts by weight (D) Dispersant 5 parts by weight (E) 180 parts by weight of organic solvent

評価１－１：透過濃度（第1光遮蔽層）、評価１－２：透過濃度（第２光遮蔽層）
評価２－１：抵抗率（第1光遮蔽層）、評価２－２：抵抗率（第２光遮蔽層）
評価３－１：透け、評価３－２：黒味
評価４：帯電防止性

Evaluation 1-1: Transmission density (first light shielding layer), Evaluation 1-2: Transmission density (second light shielding layer)
Evaluation 2-1: resistivity (first light shielding layer), Evaluation 2-2: resistivity (second light shielding layer)
Evaluation 3-1: See-through, Evaluation 3-2: Blackness Evaluation 4: Antistatic property

Although the case where the display element 13 is a liquid crystal display element has been described in Examples and the like, even if the display element 13 is an organic EL element, at least to prevent malfunction of the display element 13 due to static electricity. , It has been found that the present invention can be applied.

In the antistatic display device of the present invention and the vehicle instrument provided with the antistatic display device, only by providing a light shielding layer having a resistance and a transmission concentration of a predetermined value or more on the light shielding portion 17 of the light shielding plate, the static electricity of the display element is provided. It is possible to prevent malfunction due to the above and deterioration of display quality due to light leakage from the inside of the antistatic display device.
Therefore, compared to the conventional antistatic display device, even with a simple structure, the malfunction of the display element due to static electricity and the deterioration of display quality due to light leakage from the inside of the display device are well balanced. Can be prevented.

Moreover, according to the present invention, not only the antistatic property and the display performance based on the antistatic property are excellent, but also the number of manufacturing processes and the number of parts are small, and the antistatic display device intended for cost reduction, miniaturization, and weight reduction, and It is possible to stably provide a vehicle instrument provided with such an antistatic display device.
Therefore, the antistatic display device of the present invention and the vehicle instrument using the same can be applied to various applications, but are particularly suitable for display applications of vehicle instruments such as automobiles and motorcycles, and Since it is lightweight and economical, it has extremely high industrial applicability.

10: Antistatic display device 11: Light source 13: Display element 15: Light transmission region 17: Light shielding portion 19: Light shielding plate 19a: Translucent resin base material 21: Lens member 23: Light shielding layer 23a: First light Shielding layer 23b: Second light shielding layer 30: Vehicle instrument 32: Instrument area 32a: Guide ring g1: Shortest distance between light shielding plate and display element g2: Shortest distance between light shielding plate and lens member

Claims (8)

An antistatic display device having at least a display element, a light shielding plate having a light transmitting region and a light shielding portion, and a lens member from below along the vertical direction.
An antistatic display device characterized in that the light shielding portion has a light shielding layer having a transmission density of 6 or more and a resistivity of 5 × 10 ¹² Ω · cm or more as measured by a Macbeth densitometer. .. Claim 1 is characterized in that the light shielding plate has a multilayer structure including at least a first light shielding layer, a translucent resin base material, and a second light shielding layer from the side of the display element. The antistatic display device described in. The antistatic display device according to claim 2, wherein either the first light shielding layer or the second light shielding layer is a solvent-type shielding composition or a photocurable shielding composition. The antistatic display device according to any one of claims 1 to 3, wherein the shortest distance between the light shielding plate and the lens member exceeds 10 mm. The antistatic display device according to any one of claims 1 to 4, wherein the shortest distance between the light shielding plate and the display element is a value within the range of 0.1 to 3 mm. The antistatic display device according to any one of claims 2 to 5, wherein the translucent resin base material is a base material containing a polycarbonate resin or a polyester resin as a main component. The antistatic display device according to any one of claims 1 to 6, wherein the display element is a liquid crystal display element, and a light source is provided below along the vertical direction. A vehicle instrument comprising the antistatic display device according to any one of claims 1 to 7 adjacent to an analog instrument and / or a digital instrument.

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