JP2002268080A - Display device, spectacles and color tone correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of correcting continuously the color tone of a picture in accordance with age and an individual difference because the visibility with respect to light in a blue color region of light in visible light is lowered with progress of aging and a picture which is sensed by the color sense is seen as a yellowish picture. SOLUTION: The ratio between the light intensity of light in a blue wavelength region of a picture to be displayed and the light intensity of light in a red wavelength region of the picture is controlled by a display device in which liquid crystal cells including dichroic dyes which absorb more light in the red wavelength region than light in the blue wavelength region and a voltage control part for controlling a voltage to be applied to transparent electrodes being in the liquid crystal cells are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device,
In particular, the present invention relates to a display device capable of controlling the ratio of the light intensity of blue wavelength light to the light intensity of red light included in an image to be displayed.

[0002]

2. Description of the Related Art As a person gets older (aged), the lens in the eyeball becomes yellow and the function of blue cones (photoreceptors) deteriorates. It is known that the visibility decreases with respect to wavelength region light).

[0003] For this reason, when an elderly person perceives an object through an image displayed on a display device or glasses, he or she perceives the object as yellowish as compared with a young person.

As a countermeasure, there is a method in which the color temperature of an image on a display device is increased to enhance the short-wavelength band light (blue wavelength band light) in which visibility deteriorates beforehand for display.

Further, as a method of correcting the color tone more accurately, the optical filter is used to reduce the luminosity of the short-wavelength band light (blue-wavelength band light). There is a method of suppressing. In this case, an optical filter using a pigmented colored glass or a dielectric multilayer film that reflects light in a long wavelength region (red wavelength region light) is used.

There is also an invention relating to an image pickup apparatus provided with a color temperature correction filter capable of controlling the color temperature of an image of a subject to be shot at high speed and continuously (Japanese Patent Laid-Open No. 2000-8918).
8).

The invention described in Japanese Patent Application Laid-Open No. 2000-89188 is an invention relating to an image pickup apparatus. When an object is photographed by the image pickup apparatus, color temperature correction is performed, and the color temperature corrected image is output to an individual home or the like. It will be displayed on the display device. Then, the image whose color temperature has been corrected by the imaging device is displayed in the same manner on each display device.

[0008]

However, the above-mentioned prior art has the following problems. Depending on the age and individual differences, the visibility of short-wavelength light (blue wavelength light) may vary, and depending on the object being viewed and the lighting environment, people may have different perceptions of yellow color. Had to be made.

In particular, even if the color temperature is corrected by the image pickup device, the same image is displayed on each display device. Therefore, the color tone of the light incident on the eyeball is corrected according to the difference in visibility between the people who view the light incident on the eyeball (for example, an old man and a young man) and the object to be viewed even by the same person or the lighting environment. I couldn't do that.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object the difference in the visibility of people who see the light incident on the eyeball, the object to be viewed and the illumination. It is an object of the present invention to provide a display device and glasses that can continuously correct the color tone of light incident on an eyeball according to an environment.

[0011]

In order to achieve the above object, a display device according to the present invention comprises an image generating section (for example, the image generating section 12 in FIG. 1) for generating an image, and an image generating section for generating the image. In a display device (for example, the display device 13 in FIG. 1) including an optical filter (for example, the optical filter 1 in FIG. 1) that changes the light spectrum of the obtained image, the optical filter has a light transmittance of blue wavelength band light. Is a liquid crystal containing a dichroic dye (for example, dichroic dye 2 in FIG. 1) having light transmission characteristics larger than the light transmittance of light in the red wavelength region, and a transparent electrode (for example, FIG. 1) sandwiching the liquid crystal. A transparent electrode 4);
A voltage control unit (for example, the voltage control unit 11 in FIG. 1) that controls a voltage applied between the transparent electrodes sandwiching the liquid crystal,
By controlling the voltage applied between the transparent electrodes, the ratio of the light intensity of the blue wavelength region light and the light intensity of the red wavelength region light transmitted through the liquid crystal is controlled.

With this configuration, there is provided a display device capable of continuously correcting the color tone of the light incident on the eyeball according to the difference in luminosity of people watching the light incident on the eyeball, the object to be viewed, and the illumination environment. can do. The liquid crystal contains an anthraquinone dichroic dye. Thereby, the absorption of the red wavelength region light can be further enhanced.

The liquid crystal molecules constituting the liquid crystal (for example, the liquid crystal molecules 3 in FIG. 1) are twisted. This makes it possible to configure an optical filter having no polarization dependence with a single set of liquid crystal and a transparent electrode sandwiching the liquid crystal.

Further, the liquid crystal is a nematic liquid crystal. Thereby, the response speed of the liquid crystal molecules at the time of applying a voltage can be improved.

The display device further comprises a polarizing plate (for example, the polarizing plate 14 in FIG. 6) for selecting a specific polarization direction. Thus, an optical filter can be configured with one set of a liquid crystal and a transparent electrode sandwiching the liquid crystal.

Further, the optical filter includes two sets of the liquid crystal and a transparent electrode sandwiching the liquid crystal, and the alignment direction of the liquid crystal molecules constituting the liquid crystal in the first set and the liquid crystal in the second set. It is characterized in that the orientation direction of the constituent liquid crystal molecules is approximately 90 degrees. Thereby, an optical filter having no polarization dependence can be configured.

The display device according to the present invention includes a light source (for example,
A display device including: a light source 16 in FIG. 7), a display unit (for example, the display unit 17 in FIG. 7) that displays an image from light generated by the light source, and an optical filter that changes a light spectrum of the image. The optical filter is disposed between the light source and the display unit, and the optical filter has a light transmission characteristic in which the light transmittance of blue wavelength band light is greater than the light transmittance of red wavelength band light. A liquid crystal containing a chromatic dye, a transparent electrode sandwiching the liquid crystal, and a voltage control unit that controls a voltage applied between the transparent electrodes sandwiching the liquid crystal, by controlling a voltage applied between the transparent electrodes. Controlling the ratio of the light intensity of the blue wavelength region light and the light intensity of the red wavelength region light transmitted through the liquid crystal. This makes it possible to continuously correct the color tone of light.

Further, the spectacles according to the present invention comprise spectacles provided with an optical filter for changing an optical spectrum, wherein the optical filter has a light transmittance of blue wavelength band light larger than that of red wavelength band light. A liquid crystal containing a dichroic dye having transmission characteristics; and a transparent electrode that can apply a voltage from the outside and sandwich the liquid crystal. The voltage transmitted between the transparent electrodes is controlled to transmit the liquid crystal cell. It is characterized in that the ratio of the light intensity of the blue wavelength region light to the light intensity of the red wavelength region light is controlled. Thus, it is possible to provide eyeglasses that can continuously correct the color tone of the light incident on the eyeball according to the difference in luminosity of people who view the light incident on the eyeball, the object to be viewed, and the illumination environment.

Further, the color tone correcting device according to the present invention is a color tone correcting device including an optical filter for changing an optical spectrum, wherein the optical filter has a light transmittance of a blue wavelength band light. A liquid crystal containing a dichroic dye having a larger light transmission characteristic, a transparent electrode sandwiching the liquid crystal, and a voltage controller for controlling a voltage applied between the transparent electrodes sandwiching the liquid crystal. By controlling the voltage applied to the liquid crystal, the ratio of the light intensity of the blue wavelength region light and the light intensity of the red wavelength region light transmitted through the liquid crystal is controlled. Accordingly, it is possible to provide a color tone correction device capable of continuously correcting the color tone of the light incident on the eyeball according to the difference in visibility of people who see the light incident on the eyeball and the viewing target or the lighting environment. it can.

[0020]

Next, an embodiment of a display device according to the present invention will be described with reference to the drawings. Embodiment 1 FIG. 1 shows a configuration diagram of a display device according to Embodiment 1. In addition, the eyeball 9 schematically shows an eye of a person who looks at the display device. 1, the display device 13 according to the first embodiment includes the optical filter 1 and the image generation unit 12.

The image generator 12 is configured to emit an image. As the image generation unit 12, various display devices such as a cathode ray tube, a liquid crystal display, a plasma display, an electroluminescence display, a field emission display, and an electrophoretic display can be used. Generally, an image contains light of different wavelengths from blue wavelength light to red wavelength light. Further, the image is in an unpolarized state. For example, even in the case of red wavelength region light, light polarized in all directions in a plane 15 perpendicular to the traveling direction of red wavelength region light (the direction of the arrow in FIG. 1). It is included. Here, any polarized light can be divided into polarized components that are orthogonal to each other. FIG. 1 shows, as an example, a red wavelength band light 71 (solid line) and a red wavelength band light 72 (dashed line) propagating in mutually orthogonal polarization directions. In addition, even light other than the red wavelength region light of the image can be similarly divided into light components that propagate in polarization directions orthogonal to each other,
FIG. 1 shows only the red wavelength band light.

Next, the optical filter 1 is composed of two liquid crystal cells 61 and 62, a lead wire 10, and a voltage control unit 11.

The liquid crystal cells 61 and 62 are configured so that the dichroic dye 2 and the liquid crystal molecules 3 are sandwiched between two glass substrates 5 on which the transparent electrodes 4 are adhered. If not, the liquid crystal molecules 3 and the dichroic dye 2 are arranged parallel to the transparent electrode 4 (homogeneous alignment). The alignment direction of the liquid crystal molecules 3 of the liquid crystal cell 61 and the alignment direction of the liquid crystal molecules 3 of the liquid crystal cell 62 are orthogonal to each other.

The types of liquid crystal include nematic liquid crystal,
A cholesteric liquid crystal or a smectic liquid crystal can be used, but a nematic liquid crystal is particularly useful for obtaining a high-speed response. Note that ferroelectric liquid crystal, which is a kind of smectic liquid crystal, may be used.

The dichroic dye 2 is a spectral component that absorbs light in the long wavelength range (light in the red wavelength range (600 to 700 nm)) more strongly than light in the short wavelength range (blue light in the wavelength range (400 to 500 nm)). Has characteristics. Due to this property, the light spectrum of the display light 8 transmitted through the liquid crystal cells 61 and 62 has a long-wavelength region light component less than the light spectrum of the image generated by the image generation unit 12.

Therefore, if the property of the dichroic dye 2 is used, the ratio of the display light 8 to the blue wavelength region light component can be relatively increased. That is, it is possible to change the ratio between the light intensity of the blue wavelength band light and the light intensity of the red wavelength band light,
Color tone correction can be performed.

The dichroic dye 2 has a property of strongly absorbing polarized light (light vibration component) in the molecular long axis direction. That is, the dichroic dye 2 strongly absorbs a long-wavelength region light component of light polarized in the molecular long axis direction. On the other hand, the light component in the long wavelength region of light polarized in the direction perpendicular to the long axis direction of the molecule does not absorb much. It should be noted that the absorbance of the blue wavelength region light has little difference depending on the orientation direction of the dichroic dye 2.

As described above, the dichroic dye 2 has a polarization dependency on the light in the red wavelength region, and therefore, the liquid crystal cell 6
If the optical filter 1 is composed of one and one, it has polarization dependency.

For this reason, in the first embodiment shown in FIG.
The liquid crystal molecules 3 (and the dichroic dyes 2) are configured so that two liquid crystal cells 61 and 62 in which the molecular orientations of the liquid crystal molecules 3 and the dichroic dye 2 are orthogonal to each other are overlapped to eliminate the polarization dependence of light absorption.

In the transmission spectral characteristics of the optical filter 1, the maximum transmittance of the blue wavelength region light (wavelength 400 to 500 nm) is compared with the red wavelength region light (wavelength 600 to 700 nm).
It is desirable that the minimum transmittance of m) is suppressed to 2/3 in a 60-year-old person and to about 1/3 in a 70-year-old person.

As described above, the dichroic dye 2 has a spectral characteristic in which the longer the wavelength of visible light, the greater the absorption. Usually, since the dichroic dye 2 has a unique absorption wavelength due to a unique molecular structure including π-electron conjugation, a plurality of dyes having different absorption wavelength peaks from each other to obtain desired spectral characteristics. It is desirable to formulate the materials.

In particular, anthraquinone dyes that strongly absorb light in the long wavelength region (light in the red wavelength region) are useful.

The transparent electrodes 4 of the two liquid crystal cells 61 and 62
Is connected to a voltage controller 11 via a lead wire 10.

The voltage controller 11 includes two liquid crystal cells 61,
The same AC or DC voltage can be applied between the transparent electrodes 4 in 62. FIG. 2 shows a liquid crystal cell 6.
1 shows a case where a predetermined voltage is applied, and a case where the major axis directions of the liquid crystal molecules 3 and the dichroic dye 2 are inclined by about 45 degrees from a case where no voltage is applied. FIG. 3 shows a case where a larger voltage is applied and the major axis directions of the liquid crystal molecules 3 and the dichroic dye 2 are inclined by about 90 degrees from a case where no voltage is applied.
Thus, by changing the voltage applied between the transparent electrodes 4, the orientation direction of the liquid crystal molecules 3 and the dichroic dye 2 can be changed.

The display device according to the first embodiment is configured as described above, and its operation and function will be described below. Note that the image contains various wavelength components from blue wavelength light to red wavelength light, but the present invention provides:
Since the feature is that the absorption ratio of the red wavelength band light is changed, only the red wavelength band light will be described. Further, the red wavelength region light of the image includes red wavelength region light polarized in various polarization directions, but these can be divided into polarization components orthogonal to each other. Also,
For simplicity, the absorptance of the red wavelength region light polarized in the major axis direction of the dichroic dye 2 is set to 100, and the red wavelength region light polarized in the direction perpendicular to the major axis direction of the dichroic dye 2 Is assumed to be 0. Note that the operation described below can be similarly considered for light other than the red wavelength region. However, in the first embodiment, since a dichroic dye that absorbs the red wavelength region light well is used, For light other than wavelength band light, 2
The difference between the absorptivity of the red wavelength region light polarized in the major axis direction of the dichroic dye 2 and the absorptance of the red wavelength region light polarized in the direction perpendicular to the major axis direction of the dichroic dye 2 There is no. That is,
Even if the dichroic dye 2 is polarized in the major axis direction, it is not absorbed so much as it approaches blue wavelength region light.

First, the case where no voltage is applied between the transparent electrodes 4 will be described. Image generation unit 12 shown in FIG.
The red wavelength band lights 71 and 72 of the image generated from the first
Incident on the liquid crystal cell 61 of FIG.

When no voltage is applied between the transparent electrodes 4 of the first liquid crystal cell 61, the liquid crystal molecules 3 and the dichroic dye 2 having an elongated molecular structure are oriented in parallel with the transparent electrode 4. are doing. Therefore, the red wavelength region light 71 (solid line) polarized in the major axis direction of the dichroic dye 2 is absorbed. On the other hand, the red wavelength region light 72 (broken line) polarized in the direction perpendicular to the major axis direction of the dichroic dye 2 is not absorbed. (Heilmeier type guest host operation method).

Therefore, only the red wavelength band light 72 (broken line) of the image passes through the liquid crystal cell 61. The transmitted red wavelength band light 72 (wave line) of the image is transmitted to the liquid crystal cell 62.
Incident on.

Since no voltage is applied to the liquid crystal cell 62, the major axis direction of the dichroic dye 2 and the red wavelength light 7
The polarization directions of 2 (broken line) match. Therefore, the liquid crystal cell 62 absorbs the red wavelength region light 72 (wave line) of the image. Thus, the display light 8 transmitted through the liquid crystal cell 62 includes
Red wavelength region light is not included.

Next, it is assumed that a voltage is applied between the transparent electrodes 4 of the liquid crystal cell 61 so that the orientation direction of the liquid crystal molecules 3 is as shown in FIG. When a voltage as shown in FIG. 2 is applied between the transparent electrodes 4 of the first liquid crystal cell 61, the orientation of the liquid crystal molecules 3 and the dichroic dye 2 having an elongated molecular structure is aligned with respect to the transparent electrode 4. Tilt.

For this reason, part of the red wavelength region light 71 (solid line) of the image is absorbed and the rest is transmitted. Further, the red wavelength band light 72 (dashed line) of the image is not absorbed.

In the second liquid crystal cell 62, the red wavelength band light 71 (solid line) of the image is not absorbed, and the red wavelength band light 72 (dashed line) of the image is partially absorbed and the rest is transmitted. I do. Thus, the display light 8 transmitted through the liquid crystal cell 62
Includes light in the red wavelength region having a light intensity smaller than that before transmission through the optical filter 1.

Next, it is assumed that a voltage is applied between the transparent electrodes 4 of the liquid crystal cell 61 such that the orientation direction of the liquid crystal molecules 3 is as shown in FIG. 3 between the transparent electrodes 4 of the first liquid crystal cell 61.
When the voltage is applied to the extent shown in (1), the orientation of the liquid crystal molecules 3 and the dichroic dye 2 having an elongated molecular structure is oriented in the direction of the electric field generated by completely applying the voltage. That is, it becomes substantially perpendicular to the transparent electrode 4.

Therefore, the red wavelength region light 71 (solid line) of the image is transmitted without being absorbed. Also, the red wavelength band light 72 (wave line) of the image is not absorbed. Then, in the second liquid crystal cell 62, the red wavelength region light 71 (solid line) of the image is not absorbed, and the red wavelength region light 72 (dashed line) of the image is not absorbed. Thus, the display light 8 transmitted through the liquid crystal cell 62 contains red wavelength band light having the same light intensity as that of the red wavelength band light before passing through the optical filter 1.

As described above, in the display device according to the first embodiment, the orientation direction of the liquid crystal molecules 3 and the dichroic dye 2 is continuously changed by changing the magnitude of the voltage applied to the transparent electrode 4. The light transmittance of the red wavelength region light of the image can be continuously controlled.

Accordingly, since the light transmittance in the long wavelength region of the image can be freely controlled, an accurate color tone correction of the image can be performed in accordance with the degree of decrease in the visibility of individual people who view the image through the display device and individual differences. It can be carried out.

Next, an experimental production of the optical filter 1 shown in FIG. 1 will be described.

First, a 0.07 μm thick transparent electrode 4 made of In ₂ O ₃ : Sn was deposited on a glass substrate 5 made of soda glass having a thickness of 0.7 mm.

Next, after a polyimide alignment film having a thickness of 0.05 μm is applied on the transparent electrode 4, it is rubbed with a ray roll to align the liquid crystal molecules 3 in parallel with the glass substrate 5. A film was formed (not shown in FIG. 1).

Next, the two glass substrates with the alignment films were bonded to each other with a spherical hard plastic spacer (diameter: 6 μm) (not shown) with the two alignment films facing each other.
The gap was filled with liquid crystal molecules 3 of nematic liquid crystal containing dichroic dye 2.

In this manner, the optical filter 1 prototyped
FIG. 4 shows spectral characteristics of transmitted light when an applied voltage of 10 Vrms (rms indicates an effective value) is applied, and 3.5 Vrms and 0 Vrms are applied. The horizontal axis in FIG. 4 indicates the wavelength of light, and the vertical axis indicates light transmittance.

When no voltage is applied to the transparent electrodes 4 of the two liquid crystal cells 61 and 62, it can be seen that the light absorption of the red wavelength region light is larger than that of the blue wavelength region light (the maximum transmittance of the blue wavelength region light). On the other hand, the minimum value of the light transmittance of the red wavelength region light is about 1/2).

On the other hand, when a sufficient AC voltage (10 Vrms) is applied by the voltage controller 11, the transmittance of the red wavelength region light is increased, and is equal to the transmittance of the blue wavelength region light.

Therefore, it has been found that the ratio of the light intensity of the red wavelength region light to the light intensity of the blue wavelength region light can be greatly continuously controlled by using an AC voltage of 0 to 10 Vrms.

FIG. 5 shows the result of measuring the color temperature characteristics of the transmitted light when the white light of the xenon lamp is incident on the optical filter 1.

The horizontal axis in FIG. 5 indicates the applied voltage, and the vertical axis indicates the color temperature. Apply AC voltage of 10V
By changing from rms to 0 Vrms, the absorption of light in the long wavelength region increases, and the color temperature increases from 6000K to 1100.
It was confirmed that the temperature can be increased to 0K.

In the display device according to the first embodiment, an example is shown in which the optical filter 1 is configured using two liquid crystal cells 61 and 62. However, the optical filter 1 is configured using one liquid crystal cell 61. Is also good. In this case, it is necessary to arrange the polarizing plate 14 before and after one liquid crystal cell 61 as shown in FIG. The polarizing plate 14 is a polarizing plate that transmits only light polarized in the major axis direction of the liquid crystal molecules 3.

At this time, when the light in the non-polarized state is incident, only the polarized light component in one direction can be used, the light loss of the transmitted display light 8 increases, and the transmitted light intensity (ie, luminance) is effectively reduced. descend.

However, if a white tailor type liquid crystal cell in which the arrangement of the liquid crystal molecules 3 is twisted and the torsion axis is set in the horizontal or vertical direction with respect to the glass substrate 5 is used, only one liquid crystal cell 61 can be used without using a polarizing plate. Optical filter 1
Can also be configured. This is because the same light transmittance can be obtained for all polarization components by twisting.

In the configuration of the display device according to the first embodiment, since the liquid crystal cells 61 and 62 are homogeneously aligned,
A liquid crystal having a positive dielectric anisotropy is used. However, homeotropic alignment in which the liquid crystal molecules 3 stand on the substrate surface in the absence of an applied voltage may be used. In this case, a liquid crystal having a negative dielectric anisotropy is used.

When a liquid crystal display is used as the image light generation unit 12 shown in FIG. 1, an image emitted from the liquid crystal display is light having a specific polarization state. You may comprise so that one liquid crystal cell 61 which absorbs the light of a polarization state may be used.

In the case of a non-light emitting display such as a liquid crystal display or an electrophoretic display as shown in FIG. 7, the optical filter 1 may be provided between the light source 16 and the display unit 17.

In the display device according to the first embodiment, the optical filter 1 and the voltage control unit 11 are configured separately, but the voltage control unit 11 only generates an AC or DC voltage to be supplied to the optical filter 1. Since it is a simple electronic circuit configuration, the optical filter 1 and the voltage control unit 11 may be configured to be integrated.

Further, in order to make the display device compact, the optical filter 1 and the voltage control unit 11 are connected to the image generation unit 12.
And may be configured integrally.

As described above, by integrating them, a display device having an accurate color tone correction function can be constructed at low cost. Embodiment 2 FIG. An embodiment of the glasses according to the present invention will be described with reference to the drawings. The same reference numerals are used for the same components as in the first embodiment, and the description is omitted.

FIG. 8 shows a configuration of eyeglasses according to the second embodiment. The glasses 18 include a liquid crystal cell 61 and a liquid crystal cell 62. The liquid crystal cells 61 and 62
It comprises a transparent electrode 4, liquid crystal molecules 3, and dichroic dye 2. Note that the frame part of the glasses is omitted.

The transparent electrode 4 is configured to be connected to a voltage controller 11 for applying a voltage from the outside via a lead wire.

In the first embodiment, the image generated by the image generation unit 12 is targeted. In the second embodiment, light from a natural object or the like is also incident on the glasses. .

The operation is the same as that of the first embodiment, and a description thereof will be omitted. By configuring the glasses in the second embodiment in this way, the color tone of light incident on the eyeball is continuously corrected according to the difference in luminosity of people who view the target through the glasses, and the target and the illumination environment. Glasses that can be provided. In addition, a convex or concave portion may be provided on the glass substrate 5 to form a spectacle lens having a visual acuity correcting function. Further, a spectacle lens having a visual acuity correcting function may be configured by attaching a single-sided concave lens or a single-sided convex lens to both sides of the glass substrate 5. According to the spectacle lens configured as described above, the visual acuity can be corrected, and a liquid crystal containing a dichroic dye that absorbs more red light than blue light can be applied to the liquid crystal and an external voltage. Since the transparent electrode sandwiching the liquid crystal is provided, an effect of continuously correcting the color tone of light can be obtained.

The voltage control unit 11 externally configured
Is a simple circuit that only applies an AC or DC voltage to the transparent electrode 4 of the spectacles 18, so that it is possible to provide a color correction device integrated with the spectacles described above.

[0071]

According to the display device of the present invention, a liquid crystal containing a dichroic dye that absorbs more red light than blue light, a transparent electrode sandwiching the liquid crystal, and a voltage applied to the transparent electrode are used. Since the display device is configured by providing the voltage control unit for controlling, an effect of continuously correcting the color tone of light emitted from the display device can be obtained. Therefore, according to the present invention, it is possible to provide a display device capable of correcting the color tone of light according to a reduction in the visibility of individual people who perceive light through the display device or individual differences.

According to the spectacles of the present invention, a liquid crystal containing a dichroic dye that absorbs more red light than blue light can be applied with a voltage from the outside, and a transparent electrode sandwiching the liquid crystal can be used. With this arrangement, an effect of continuously correcting the color tone of light can be obtained. Therefore, it is possible to provide spectacles that can continuously correct the color tone of light incident on the eyeball according to the difference in visibility of people who view the target through the spectacles and the target and the illumination environment. According to the color tone correcting device of the present invention, a liquid crystal containing a dichroic dye that absorbs more red light than blue light, a transparent electrode sandwiching the liquid crystal, and a voltage applied to the transparent electrode are controlled. Since the display device is configured by providing the voltage control unit, the effect of continuously correcting the color tone of light emitted from the display device can be obtained.

[0073]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a display device in Embodiment 1.

FIG. 2 is a diagram showing the orientation direction of liquid crystal molecules when a predetermined voltage is applied to a liquid crystal cell 61.

FIG. 3 is a diagram illustrating the orientation direction of liquid crystal molecules when a voltage higher than that in FIG. 2 is applied to the liquid crystal cell 61.

FIG. 4 is a diagram showing spectral characteristics of transmitted light when an applied voltage applied to the optical filter 1 is changed.

FIG. 5 is a diagram showing a color temperature characteristic of light transmitted through a white light of a xenon lamp entering an optical filter 1;

FIG. 6 is a diagram showing a modification of the configuration of the display device in Embodiment 1.

FIG. 7 is a diagram illustrating another configuration of the display device in Embodiment 1.

FIG. 8 is a diagram mainly showing a configuration of eyeglasses according to a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical filter 2 dichroic dye 3 liquid crystal molecule 4 transparent electrode 5 glass substrate 8 display light 9 eyeball 10 lead wire 11 voltage control unit 12 image generation unit 13 display device 14 polarizing plate 15 plane perpendicular to light traveling direction 16 light source 17 display section 18 glasses 61 liquid crystal cell 62 liquid crystal cell 71 red wavelength band light 72 red wavelength band light

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Haruo Isono 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation F-Term (in reference) 2H006 BE03 2H049 BA17 BA37 BA42 BB03 BC24 2H088 EA35 GA02 GA13 GA15 HA11 HA18 JA05 JA06 KA11 MA05 2H089 HA22 HA23 HA28 HA29 HA30 HA32 QA16 UA09

Claims (9)

[Claims] 1. A display device comprising: an image generation unit that generates an image; and an optical filter that changes a light spectrum of the image generated by the image generation unit, wherein the optical filter has a light transmittance of blue wavelength band light. Is a liquid crystal containing a dichroic dye having light transmission characteristics larger than the light transmittance of light in the red wavelength region, a transparent electrode sandwiching the liquid crystal, and a voltage control for controlling a voltage applied between the transparent electrodes sandwiching the liquid crystal. Display, comprising controlling a voltage applied between the transparent electrodes to control a ratio of light intensity of blue wavelength band light to red wavelength band light transmitted through the liquid crystal. apparatus. 2. The display device according to claim 1, wherein the liquid crystal contains an anthraquinone dichroic dye. 3. The display device according to claim 1, wherein the orientation of the liquid crystal molecules constituting the liquid crystal is a twist orientation. 4. The display device according to claim 1, wherein said liquid crystal is a nematic liquid crystal. 5. The display device according to claim 1, wherein the display device further comprises a polarizing plate for selecting a specific polarization direction. 6. The optical filter includes two sets of the liquid crystal and a transparent electrode sandwiching the liquid crystal, wherein the orientation direction of liquid crystal molecules constituting the liquid crystal in the first set and the second direction are determined.
The liquid crystal molecules constituting the liquid crystal in the set have an alignment direction of about 90.
The display device according to claim 1, wherein the display is a degree. 7. A display device comprising: a light source; a display unit for displaying an image from light generated by the light source; and an optical filter for changing a light spectrum of the image, wherein the optical filter includes the light source and the light source. A liquid crystal containing a dichroic dye having a light transmission characteristic in which light transmittance of blue wavelength band light is greater than light transmittance of red wavelength band light; A transparent electrode sandwiching the liquid crystal, and a voltage controller that controls a voltage applied between the transparent electrodes sandwiching the liquid crystal. By controlling a voltage applied between the transparent electrodes, blue wavelength band light transmitted through the liquid crystal is provided. A display device for controlling a ratio between the light intensity of the red light and the light intensity of the red wavelength region light. 8. An eyeglass comprising an optical filter for changing an optical spectrum, wherein the optical filter has a dichroic property in which light transmittance of blue wavelength band light is greater than light transmittance of red wavelength band light. A liquid crystal containing a dye, and a transparent electrode that can apply a voltage from the outside and sandwich the liquid crystal. The light intensity of blue wavelength band light transmitted through the liquid crystal cell is controlled by controlling a voltage applied between the transparent electrodes. Glasses for controlling the ratio of the light intensity of the red light and the red wavelength light. 9. A color tone correcting apparatus having an optical filter for changing an optical spectrum, wherein the optical filter has a light transmission characteristic in which light transmittance of blue wavelength band light is greater than light transmittance of red wavelength band light. A liquid crystal containing a chromatic pigment, a transparent electrode sandwiching the liquid crystal, and a voltage control unit that controls a voltage applied between the transparent electrodes sandwiching the liquid crystal, by controlling a voltage applied between the transparent electrodes. A color tone correction device for controlling the ratio of the light intensity of the blue wavelength region light to the light intensity of the red wavelength region light transmitted through the liquid crystal.