JPH10119608A - Head up display for moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a satisfactory contrast by applying contrivance to a panel structure for using a light dispersion liquid crystal as holding its front dispersion type as it is. SOLUTION: When no electric potential is applied to a liquid crystal panel, light beams from a light source (Refer to symbol L) incident inside of an electrode substrate 80 from its outer surface side are refracted to the sight direction of an operator on the boundary layer between a transparent projecting layer 110 and a liquid crystal layer 100, dispersed by a PDLC layer 90 and emitted from an electrode substrate 70 (Refer to symbol L1). On the other hand, when any potential is applied, a light from a light source incident from the outer surface side of the electrode substrate 80 to the inside thereof goes straight without making refraction as it is and emitted from the electrode substrate 70 (Refer to symbol L2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-up display suitable for use in a moving body such as an automobile, a ship, and a railroad vehicle.

[0002]

2. Description of the Related Art Conventionally, for example, a head-up display for an automobile has a transmission type liquid crystal panel erected near an inner lower edge of a front windshield of the automobile. The driver can view the scene in front of the vehicle through the LCD panel. As a result, the driver can drive safely with less movement of the line of sight.

A liquid crystal panel in such a head-up display is disclosed in Japanese Unexamined Patent Publication No.
It is conceivable to employ a forward scattering type display element disclosed in Japanese Patent No. 40886. In this forward-scattering display element, as shown in FIG. 11, a liquid crystal panel 2 using a polymer-dispersed liquid crystal (hereinafter, referred to as a polymer-dispersed liquid crystal panel 2) is arranged behind a transmission hologram 1. Hologram 1
The light from the light source 3 located at the lower front of the vehicle is refracted by the hologram 1 and transmitted through the polymer dispersed liquid crystal panel 2 toward the driver.

[0004]

However, in the above-mentioned forward scattering type display element, although the utilization ratio of the light source 3 to the light is high, in the region where the light is not scattered in the polymer dispersed liquid crystal panel 2, the light from the light source 3 is not. Is transmitted light based on this light. For this reason, the entire surface of the polymer dispersed liquid crystal panel 2 has a bright display, and as a result, there is a problem that the display contrast of the polymer dispersed liquid crystal panel 2 is reduced.

In order to cope with such a problem, the present invention devises a panel structure using a light-dispersing liquid crystal while maintaining a forward-scattering type, thereby ensuring a good contrast. It is intended to provide a head-up display.

[0006]

According to the first, third, and fourth aspects of the present invention, a liquid crystal panel includes a light-dispersing liquid crystal layer and a light-dispersing liquid crystal layer provided on a front side thereof. A transparent layer and a liquid crystal layer which are provided in parallel and bonded to each other. When the liquid crystal panel is driven, the transparent layer and the liquid crystal layer refract incident light to the liquid crystal panel in both the first joining layer regions in the direction of the driver's line of sight, and in both the second joining layer regions. From the line of sight of the operator.

Further, when the liquid crystal panel is driven, the light dispersion liquid crystal layer emits light from the first junction layer region as scattered light representing information of the moving body in the first liquid crystal layer region, and the second liquid crystal layer. In the region, light from the second bonding layer region is emitted as transmitted light in the traveling direction. As a result, light from the light source emitted from a region other than the information display region of the liquid crystal panel travels in a direction deviating from the driver's line of sight as transmitted light transmitted through the liquid crystal panel. As a result, even with the forward-scattering liquid crystal panel, the information of the moving object can be visually recognized through the liquid crystal panel together with the scene in front of the moving object while maintaining the display contrast of the liquid crystal panel in a favorable state.

Further, in the inventions described in claims 2 to 4, the transparent layer and the liquid crystal layer described in claim 1 are provided on the rear side of the light dispersion liquid crystal layer. Then, when the liquid crystal panel is driven, the light dispersion liquid crystal layer travels the incident light to the liquid crystal panel as scattered light representing information of the moving body in the first liquid crystal layer region, and travels upward in the second liquid crystal layer region. The incident light travels as transmitted light.

Further, when the liquid crystal panel is driven, the transparent layer and the liquid crystal layer refract the scattered light from the first liquid crystal layer region in the first joining layer region in the direction of the driver's line of sight and emit the light. The transmitted light from the second liquid crystal layer region is emitted from the two junction layer regions so as to be out of the driver's line of sight. With this, the same operation and effect as the first aspect can be achieved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a vehicular head-up display according to the present invention. The head-up display is provided on an upper wall 21 of a dashboard 20 extending from a lower edge 11 of a front windshield 10 of the vehicle to a vehicle interior. Is located forward in the line-of-sight direction of the driver M sitting on the vehicle.

As shown in FIGS. 1 and 2, the head-up display includes a casing 30, a transmissive liquid crystal panel P, a light source 40, and a driving device 50. The casing 30 includes an upper wall 21 of the dashboard 20.
Mounted on top. The liquid crystal panel P is
The upper wall 31 is erected on a rear portion 31a. Light source 40
Is housed at the front end inside the casing 30, and the light source 40 is projected on the entire front surface (the back surface of the liquid crystal panel P) of the liquid crystal panel P through an opening 31 b formed at the front end of the upper wall 31 of the casing 30. Light. The driving device 50
Is accommodated in the rear part of the casing 30, and the driving device 50 is connected to the liquid crystal panel P through the upper wall 31 of the casing 30 so as to drive the liquid crystal panel P. In FIG. 2, reference numeral 60 indicates a reflector of the light source 40.

As shown in FIG. 4, the liquid crystal panel P has two electrode substrates 70 and 80 facing each other, and these two electrode substrates 70 and 80 are connected to the upper wall 31 of the casing 30.
On the rear portion 31a. However, the electrode substrate 70 is on the driver M side, and the electrode substrate 80 is on the front windshield 10 side. The electrode substrate 70
And the transparent chevron layer 1 formed on the electrode substrate 80 as described later.
10, a polymer dispersed liquid crystal layer 90 (hereinafter referred to as PDL).
A C layer 90) and a liquid crystal layer 100 are interposed with a number of spacers (not shown).

The electrode substrate 70 has a transparent substrate 71 (made of glass or resin such as polyester or polycarbonate), and a single-layer transparent electrode 72 (ITO or SnO) is formed on the inner surface of the transparent substrate 71. ₂ etc.) are formed. On the other hand, the electrode substrate 80 has a transparent substrate 81 (made of the same material as the transparent substrate 71), and a single-film transparent electrode 82 (similar to the transparent electrode 72) is formed on the inner surface of the transparent substrate 81. Is formed.

On the inner surface of the transparent substrate 81, a plurality of thin film transistors (not shown) are arranged in a matrix to drive these pixels at positions corresponding to the plurality of matrix pixels of the liquid crystal panel P. I have. This allows
The liquid crystal panel P can display the traveling speed of the vehicle, navigation data (see FIG. 3), and the like.

The PDLC layer 90 is provided in contact with the inner surface of the transparent electrode 72. The PDLC layer 90 is formed by dispersing a large number of liquid crystal droplets 92 in a matrix resin 91. In the PDLC layer 90, when no voltage is applied, the refractive index of each liquid crystal droplet 92 in an opaque state and the refractive index of the matrix resin 91 are different from each other. On the other hand, when a voltage is applied, the refractive index of each liquid crystal droplet 92 that becomes transparent and the refractive index of the matrix resin 91 become the same.

The matrix resin 91 is made of a UV-curable resin (for example, a mixture of a monomer, an oligomer, and a polymerization initiator) capable of forming a PDLC, which is cured by UV irradiation of a high-pressure mercury lamp. As the liquid crystal droplet 92, nematic liquid crystal of cyanobiphenyl type, fluorine type or chlorine type is adopted. Transparent Yamagata layer 11
0 is a transparent electrode 8 made of a resin or an inorganic material described later.
2 is formed on the inner surface of the transparent mountain-shaped layer 110, and the inner surface 111 of the transparent mountain-shaped layer
It faces the LC layer 90.

As described later, the liquid crystal layer 100 is made of a PDLC.
The liquid crystal layer 100 is formed integrally with the transparent chevron layer 110.
It is formed in a cross-sectional mountain shape so as to be joined to the cross-sectional mountain-shaped inner surface 111. Here, the refractive index of the liquid crystal layer 100 becomes a random value when no voltage is applied, and takes a value larger than the refractive index of the transparent chevron layer 110. The refractive index of the liquid crystal layer 100 becomes the same as that of the transparent chevron layer 110 when a voltage is applied.

The liquid crystal layer 100 is driven by matrix thin film transistors together with the liquid crystal of the PDLC layer 90. Further, as a liquid crystal constituting the liquid crystal layer 100, a nematic liquid crystal forming each of the liquid crystal droplets 92 is employed. Next, the liquid crystal panel P thus configured
A method of manufacturing the device will be described. First, the transparent angle layer 110
Is prepared. There are the following methods for manufacturing the transparent chevron layer 110, but any method may be used. (1) An ultraviolet curable resin, a thermosetting resin, a two-component reactive resin, or the like is applied to a chevron-shaped mold to be produced, and cured and transferred on the inner surface of the transparent electrode 82. (2) A thermoplastic resin is poured into a chevron-shaped mold to be produced, solidified by cooling, and then placed on the inner surface of the transparent electrode 82. (3) A chevron-shaped mold to be produced is formed from a material that easily dissolves in an acid, an alkali, an organic solvent, or the like, and a CV is formed on the mold.
D, a film of an inorganic material such as SiO ₂ or SiN _{X is formed} by sputtering or the like, and the film is adhered to the inner surface of the transparent electrode 82 with an adhesive or the like. To form a transparent chevron layer.

It is to be noted that the mold to be manufactured can also be manufactured by processing using an ultra-precision lathe method generally used as a method for forming a micro Fresnel lens using diffraction, that is, a so-called grating lens mold. In this case, a resin material is preferable as the material of the transparent chevron layer in consideration of ease of fabrication. If the material of the transparent chevron layer is the same as that of the matrix resin 91, the refractive index can be easily matched.

After the transparent chevron layer 110 is formed on the inner surface of the transparent electrode 82 in this manner, the electrode substrates 70 and 80 that have been prepared in advance are bonded together via a number of spacers (a number of plastic beads). This bonding is performed so that the inner surface of the transparent electrode 72 and the inner surface 111 of the transparent chevron layer 110 face each other. Thereafter, the PDLC layer 90 and the liquid crystal layer 100 are integrally formed as follows.

In general, PDL is applied to the UV irradiation side by UV irradiation of lower intensity than the usual PDLC manufacturing conditions.
A C layer 90 is formed. Accordingly, a liquid crystal layer 100 is formed on the opposite side. More specifically, 2-ethylhexyl acrylate and M1200 type urethane acrylate manufactured by Toagosei Co., Ltd. are used as monomers and oligomers constituting the resin component, respectively, and 2hydroxy-2-methyl-1-phenylpropane-1one is used as a photopolymerization initiator. And these monomers, oligomers and photopolymerization initiator were mixed at a ratio of 7: 3: 0.1 to form a mixture. Then, as a liquid crystal, a BL002 type cyanobiphenyl-based liquid crystal manufactured by Merck & Co. was adopted, and this liquid crystal and the above mixture were mixed in a ratio of 7: 3.
To prepare a PDLC raw material as a uniform mixed liquid.

Next, the PDLC raw material thus produced was injected between the transparent electrode 72 of the electrode substrate 70 and the transparent chevron layer 110. Then, the PDLC raw material was irradiated with ultraviolet rays at an intensity of 0.5 mW / cm ² through the electrode substrate 70 by a high-pressure mercury lamp. Thereby, as shown in FIG. 4, the PDLC layer 90 was formed on the electrode substrate 70 side, and the liquid crystal layer 100 was formed on the transparent chevron layer 110 side.

Here, the reason why the ultraviolet irradiation intensity is reduced to 0.5 mW / cm ² as described above is as follows.
The UV irradiation intensity for producing a normal PDLC is 2
The irradiation intensity is lower than 50 mW / cm ² , but if the irradiation intensity is lower than this, the polymerization time can be lengthened. The polymerization time is, for example, 1 minute when producing a normal PDLC,
For low irradiation intensities can be as long as 5 minutes or more.

Along with this, a large amount of the PDLC raw material is polymerized in the ultraviolet irradiation side portion (the electrode substrate 70 side portion), so that
On the opposite side (the transparent chevron layer 110 side), a liquid crystal layer 100 composed of only liquid crystal is formed in such a manner that liquid crystal is extruded. Thereby, the manufacture of the liquid crystal panel P is completed. Incidentally, a liquid crystal panel Pa having a configuration excluding the liquid crystal layer 100 and the transparent chevron layer 110 in the liquid crystal panel P (see FIG. 7).
Were prepared, and an experiment was performed on the output angle dependence of each output light intensity of the liquid crystal panel Pa and the liquid crystal panel P in the present embodiment.

However, the liquid crystal panel Pa is manufactured in substantially the same manner as the method of manufacturing the liquid crystal panel P, except that the liquid crystal panel P is omitted from the liquid crystal layer 100 and the transparent chevron layer 110. The PDL of the liquid crystal panel Pa
The UV irradiation intensity on the C layer 90 is usually 2 to 50.
mW / cm ² . Further, regarding the emission angle dependency,
The emission direction of light incident on the liquid crystal panel P or the electrode substrate 70 of the liquid crystal panel Pa in the normal direction is used as a reference. The emission angle θ in this emission direction (see FIG. 5A) is θ = 0 °.

According to the above experiment, the results as shown in FIGS. 5B and 5C were obtained. Here, FIG.
FIG. 5C shows the dependence of the output light intensity on the liquid crystal panel Pa on the output angle θ, and FIG. 5C shows the dependence of the output light intensity on the liquid crystal panel P on the output angle θ. According to this, in the case of the liquid crystal panel Pa, the peak of the emission intensity is located at the emission angle θ = 0 ° regardless of whether or not the voltage is applied. On the other hand, in the case of the liquid crystal panel P, the peak of the emitted light intensity is located at θ = 0 ° when a voltage is applied, but shifts to a position of θ> 0 ° when no voltage is applied.

In other words, for example, when the emission angle θ is + 2 ° or −2 °, when no voltage is applied, the peak becomes θ due to the difference in the refractive index between the liquid crystal layer 100 and the transparent chevron layer 110.
= + 2 ° or θ = −2 °.
Therefore, it can be seen that the contrast in the case of the liquid crystal panel Pa is much higher than the contrast in the case of the liquid crystal panel P.

It should be noted that the above-mentioned ultraviolet irradiation intensity is 1 mW /
In the case of cm ^2, the result as shown in FIG. 5C was not obtained, but by setting the intensity to 0.5 mW / cm ² , the result as shown in FIG. 5C was obtained. Was. Further, when the irradiation intensity is not more than 0.1 mW / cm ² ,
The characteristics of the DLC layer 90 did not become good. In the present embodiment, assuming the above-described dependence of the emission angle of the liquid crystal panel P, even if the liquid crystal panel P is employed as a head-up display while maintaining the forward scattering type, a reduction in display contrast is caused. The present inventors have confirmed that the head-up display can be provided.

That is, the angle of incidence α of the liquid crystal panel P is
If the incident angle α is set so that the direction of θ = 0 is set to the line of sight of the driver M as the incident angle of the light (see reference numeral L in FIGS. 4A and 6), the liquid crystal panel P It has been found that the scattered light can enter the field of view of the driver M and the transmitted light can be prevented from entering the field of view of the driver M. If the angle of incidence of the light from the light source 40 and the direction of the line of sight of the driver M are determined, the liquid crystal panel P performs the following optical function.

When no voltage is applied to both electrode substrates 70 and 80, as described above, the refractive index of the liquid crystal layer 100 is larger than the refractive index of the transparent chevron layer 110, and the refractive index of the liquid crystal droplet 92 is Different from refractive index. Accordingly, the light from the transparent chevron layer 110 is refracted into the liquid crystal layer 100 and becomes scattered light in the PDLC layer 90 after being incident. Therefore, when the voltage is not applied, the light from the light source 40 that enters the electrode substrate 80 from the outer surface side thereof (FIGS. 1 and 4)
(Refer to the symbol L in (a)) is refracted substantially in the line of sight of the driver M at the boundary between the transparent chevron layer 110 and the liquid crystal layer 100. Next, the refracted light is scattered by the PDLC layer 90 and emitted from the electrode substrate 70 in the direction of the line of sight of the driver M as scattered light (see reference numeral L1 in FIGS. 1 and 4A).

On the other hand, when a voltage is applied to the two electrode substrates 70 and 80, the refractive index of the matrix resin 91 and the refractive index of the transparent chevron layer 110 become the same as the refractive index of the liquid crystal droplet 92 in the transparent state. For this reason, the light from the light source 40 (refer to the symbol L in FIG. 4B) that enters the electrode substrate 80 from the outer surface side goes straight as transmitted light without refraction and exits from the electrode substrate 70. (Refer to reference numeral L2 in FIG. 4B). This means that the transmitted light does not enter the line of sight of the driver M.

However, the inclination angle of the inner surface 111 of the transparent chevron layer 110 and the thickness of the transparent chevron layer 110 are determined as follows. Here, as shown in FIG.
The inclination angle of the inclined surface portion (hereinafter, referred to as the inclined surface portion 111a) with respect to the inner surface of the transparent substrate 81 is β. Output angle θ
Examination of the relationship between the tilt angle β (see FIG. 5A) and the tilt angle β revealed that the tilt angle β and the emission angle θ were almost proportional. Accordingly, the larger the emission angle θ, the brighter the display on the liquid crystal panel P. Considering this brightness, θ
Is required to be 1 ° or more, the inclination angle β of the transparent chevron layer 110 needs to be 10 ° or more.

The distance (so-called cell gap) between the two electrode substrates 70 and 80 of the liquid crystal panel Pa of FIG.
μm to 20 μm. Above this, the driving voltage of the liquid crystal becomes high, so that the thin film transistor cannot be driven. If it is less than 5 μm, the ability to scatter light is reduced, and the contrast cannot be increased. For this reason, the maximum thickness of the transparent chevron layer 110 is preferably 5 μm or less. On the other hand, if the transparent chevron layer 110 is too thin, light cannot be refracted. Therefore, the thickness of the transparent chevron layer 110 is preferably 1 μm or more.

Under such an inclination angle of the inner surface 111 of the transparent chevron layer 110 and a thickness of the transparent chevron layer 110, the relationship among the incident angle α, the inclination angle β, and the emission angle θ is as follows. Set as follows. This will be described in detail with reference to FIG. 9 and FIG. When light from the light source 40 is incident on the electrode substrate 80 from the outer surface thereof at an incident angle α when no voltage is applied, the incident light is refracted by the transparent substrate 81.
The refracted light is then transmitted to the transparent chevron layer 110 and the liquid crystal layer 100.
At the boundary with the transparent substrate 71, and finally at the time of emission from the transparent substrate 71, and is emitted at an emission angle θ.

The relationship among the incident angle α, the inclination angle β, and the emission angle θ in such a process can be obtained by calculation. α
= 30 °, the emission angle θ is determined by the inclination angle β as shown in FIG.
0 (a). Now, the direction of the light emitted from the electrode substrate 70 is changed to the line of sight of the driver M (FIGS. 1 and 4).
(See symbol L1 in (a)), so that the emission angle θ should be 0 °.

Table 1 shows the incident angle α and the inclination angle β at this time.
0 (b). From the above, if the head-up display is configured and arranged as shown in FIG. 2, the incident angle α of light from the light source 40 to the liquid crystal panel P
Is preferably 10 ° at the lower end of the liquid crystal panel P, and is preferably 62 ° at the upper end of the liquid crystal panel P. At this time, the inclination angle β is desirably 40 °.

In this embodiment configured as above,
The two electrode substrates 70 and 80 are driven by the driving device 50. Then, in the display area where no voltage is applied (the pixel area corresponding to the transistor in the off-state among the plurality of thin film transformers) of the two electrode substrates 70 and 80, the light source 40 as shown in FIG. Based on the optical action of the liquid crystal panel P, speed, simple navigation data, and the like as shown in FIG. 3 are displayed.

On the other hand, in the display area of the electrode substrates 70 and 80 where a voltage is applied (the pixel area corresponding to the on-state transistor of the plurality of thin-film transistors), FIG.
Based on the optical action of the liquid crystal panel P on the light source 40 as shown in FIG.
Go straight through. For this reason, the driver M visually recognizes the display of the speed, the simple navigation data, and the like, and also visually recognizes a scene in front of the vehicle (see reference numeral L3 in FIG. 1) through the liquid crystal panel P around the display. I can do it.

In this case, the light source 4 transmitting through the liquid crystal panel P
As described above, since the light from 0 travels straight in a direction that does not enter the field of view of the driver M, the display surface of the liquid crystal panel P does not become unnecessarily bright, and the display contrast of the speed, the navigation data, etc. Can be favorably maintained. Further, the display light from the liquid crystal panel P is scattered by the PDLC layer 90, so that the viewing angle is widened and the visibility is good.

The PDLC layer 90 and the liquid crystal layer 100
Is integrally formed as described above, so that the liquid crystal panel P
As a result, the manufacturing process is simplified. In the embodiment of the present invention, the example in which the liquid crystal material is BL002 type liquid crystal manufactured by Merck Ltd. has been described.
The present invention may be implemented by using a nematic liquid crystal such as an L205 type or a TL215 type.

The resin material may be a photo-curable resin. For example, a benzene ring type monofunctional acrylic monomer, bifunctional, trifunctional or polyfunctional monomer other than the resin described in the above embodiment may be used. Alternatively, a polyester acrylate oligomer, a vinyl ether monomer, or the like may be employed. Further, as the photopolymerization initiator, other than those described in the above embodiment, 1-hydroxycyclohexyl phenyl ketone, benzyl dimethyl ketal, or the like may be employed.

In the above embodiment, an example was described in which light from the light source 40 was incident on the liquid crystal panel P from the electrode substrate 80 side. Instead, light from the light source 40 was transmitted from the electrode substrate 70 side to the liquid crystal panel P. It may be carried out so as to be incident on the panel P. However, the light of the light source 40 that has entered from the electrode substrate 70 extends along the line of sight of the driver M and the electrode substrate 80.
The incident angle of the light source 40 with respect to the electrode substrate 70 is adjusted so that the light is emitted from.

In implementing the present invention, PDL
The present invention may be applied to a liquid crystal panel using a light dispersion liquid crystal layer without being limited to a liquid crystal panel using a C layer. Further, in practicing the present invention, ultraviolet rays are applied to produce the PDLC layer. Alternatively, the PDLC layer may be produced by irradiating visible light.

[Brief description of the drawings]

FIG. 1 is a schematic overall configuration diagram showing an embodiment of a head-up display according to the present invention.

FIG. 2 is an enlarged partial cutaway side view of the head-up display.

FIG. 3 is a display example of the liquid crystal panel of FIG. 1;

4A is a partial cross section showing a light scattering state and a light traveling direction of the liquid crystal panel of FIG. 1 when no voltage is applied,
(B) is a partial cross section showing a light transmission direction when voltage is applied to the liquid crystal panel.

5A is a side view showing an emission angle θ of incident light when light is incident on the liquid crystal panel shown in FIG. 4 or 7 at a right angle, and FIG. 5B is a side view of the liquid crystal panel shown in FIG. The relationship between the output light intensity and the output angle θ when a voltage is applied and when no voltage is applied,
FIG. 5C is a diagram showing the relationship between the output light intensity and the output angle θ of the liquid crystal panel of FIG. 4 when a voltage is applied and when no voltage is applied.

6 is a side view showing an emission angle of light from the liquid crystal panel when the incident angle of light with respect to the liquid crystal panel of FIG. 4 is a predetermined angle α, and emission light intensity of the liquid crystal panel when a voltage is applied and when no voltage is applied. FIG. 5 is a diagram showing a relationship between the angle of incidence and the emission angle θ.

FIG. 7 is a cross-sectional view of the liquid crystal panel shown in FIG. 4 with a configuration excluding a liquid crystal layer and a transparent chevron layer.

FIG. 8 is a cross-sectional view of a main part showing an inclination angle β of an inclined surface portion on the inner surface of the transparent chevron layer.

FIG. 9 is an enlarged partial cross-sectional view of the liquid crystal panel showing in detail the refraction direction of light in FIG.

FIGS. 10A and 10B are tables showing the relationship among α, β and θ in FIG. 9, respectively.

FIG. 11 is a schematic side view of a conventional forward scattering type display element.

[Explanation of symbols]

M: driver, P: transmissive liquid crystal panel, 40: light source, 50
... Drive device, 90 ... PDLC layer, 100 ... Liquid crystal layer, 10
1 ... facing surface, 110 ... transparent chevron layer, 111 ... inner surface.

Claims (4)

[Claims] 1. A transmissive liquid crystal panel (P) provided vertically on a moving body such as a vehicle in front of an operator (M) thereof, and a light source for entering light into the liquid crystal panel from the front of the moving body. (40) The liquid crystal panel displays information of the moving body in the light incident state and transmits light representing a scene from the front of the moving body in an area other than a display area of the information. The liquid crystal panel comprises a light dispersion liquid crystal layer (90) and a transparent layer (110) provided in parallel with the light dispersion liquid crystal layer on the front side thereof and joined to each other. ) And a liquid crystal layer (100). When the liquid crystal panel is driven, the transparent layer and the liquid crystal layer
First and second first areas corresponding to the information display area of the liquid crystal panel
The incident light is refracted in the direction of the driver's line of sight in the bonding layer regions (101, 111), and the second bonding layer regions (10) corresponding to regions other than the information display region of the liquid crystal panel.
1, 111), the incident light proceeds so as to deviate from the line of sight of the pilot, and when the liquid crystal panel is driven, the light-dispersing liquid crystal layer corresponds to the first liquid crystal layer corresponding to the first bonding layer region. In the region, the light from the first bonding layer region is emitted as scattered light representing the information, and the light from the second bonding layer region is emitted in the second liquid crystal layer region corresponding to the second bonding layer region. A head-up display for a mobile body, which emits as transmitted light in the traveling direction. 2. A transmissive liquid crystal panel (P) provided vertically on a moving body such as a vehicle in front of an operator (M) thereof, and a light source for entering light into the liquid crystal panel from the front of the moving body. (40) The liquid crystal panel displays information of the moving body in the light incident state and transmits light representing a scene from the front of the moving body in an area other than a display area of the information. The liquid crystal panel comprises a light dispersion liquid crystal layer (90) and a transparent layer (110) provided in parallel with the light dispersion liquid crystal layer on the rear side thereof and joined to each other. ) And a liquid crystal layer (100). When the liquid crystal panel is driven, the light dispersion liquid crystal layer transmits the incident light in a first liquid crystal layer region corresponding to the information display region of the liquid crystal panel. Traveling as scattered light representing the information, The incident light in the second liquid crystal layer region corresponding to a region other than the display area of the information of the LCD panels proceeded as transmitted light, when driving of the liquid crystal panel, the transparent layer and the liquid crystal layer,
Both first bonding layer regions (10) corresponding to the first liquid crystal layer region
1, 111), the scattered light from the first liquid crystal layer region is refracted in the direction of the driver's line of sight and emitted, and both second bonding layer regions (101, 111) corresponding to the second liquid crystal layer region. A head-up display for a mobile object, wherein the transmitted light from the second liquid crystal layer region is emitted so as to be out of the driver's line of sight. 3. The moving object head according to claim 1, wherein the light source is arranged so that the transmitted light is emitted from the liquid crystal panel in an overhead direction of the operator. Up display. 4. A joint boundary between the transparent layer and the liquid crystal layer is formed in a plurality of mountain shapes at a predetermined inclination angle, and the predetermined inclination angle transmits the scattered light from the liquid crystal panel to the driver's line of sight. The head-up display for a moving body according to claim 1, wherein the head-up display is set to emit light in a direction.