JP2006154470A - Video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device easing restrictions on night behavior, for example, in a dark place by imparting optimum luminance information. <P>SOLUTION: The video display device 1 has an imaging portion 111 imaging a subject and a display portion 100 displaying the imaged video, and displays the video while amplifying the luminance of the subject of 20 to 80% in reflection factor by 2 to 10,000 times with illumination of 1 to 10 lx. The luminance of the subject and output luminance of the display portion 100 satisfy L'20/LC20*LD20≥L'80/LC80*LD80, L'20=lim(LDx1-0LD20)/(LCx1-LC20), LCx1→LC20, L'80=lim(LDx2-LD80)/(LCx2-LC80), and LCx1→LC80. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a video display device for a person who has difficulty in behavior in a dark place, for example.

  In particular, people with symptoms such as retinitis pigmentosa and glaucoma are less sensitive to dark places and slower to adapt to darkness than normal people, so their behavior in dark places and nights is restricted. For example, a staircase or a step may not be accurately visually recognized, and the user may feel a fear of walking or walking.

As a walking support tool for people with such symptoms, there is a method of directly projecting camera information onto the retina (Patent Documents 1 to 3). In addition, there is a method (Patent Document 4) for detecting an obstacle at the foot with a distance measuring sensor.
JP 2003-307702 A (1st to 9th pages, FIGS. 1 to 10) Japanese Unexamined Patent Publication No. 2000-214408 (pages 1 to 7, FIGS. 1 to 9) JP-A-4-23579 (first to seventh pages, FIGS. 1 to 7) JP-A-8-95487 (pages 1 to 7, FIGS. 1 to 5)

  By the way, in patent documents 1-3, since there is no concept of optimizing a luminance ratio, there existed a problem that the visibility of the stairs in a dark place was not enough, for example. Further, in Patent Document 4, when displaying the detected information, since the brightness is not amplified and the brightness ratio is not optimized, the visibility of a person with symptoms such as retinal pigment degeneration or glaucoma is not improved. There was a problem.

  The present invention has been made in view of this point, and an object of the present invention is to provide a video display device capable of relaxing restrictions on, for example, a dark place or night action by giving optimum luminance information. .

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

The invention according to claim 1 is an imaging unit that images a subject;
A display unit for displaying the captured image;
At illuminance between 1 and 10 lx
An image display device, wherein the luminance of the subject having a reflectance of 20 to 80% is amplified by 2 to 10000 times and displayed.

The invention according to claim 2 is an imaging unit that images a subject;
A display unit for displaying the captured image;
The luminance of the subject and the output luminance of the display unit are
L′ 20 / LC20 * LD20 ≧ L′ 80 / LC80 * LD80
L′ 20 = lim (LDx1-LD20) / (LCx1-LC20) LCx1 → LC20
L′ 80 = lim (LDx2-LD80) / (LCx2-LC80) LCx1 → LC80
LCX: subject brightness with an arbitrary reflectivity LDX: output brightness of an arbitrary display section LC20: subject brightness with a reflectivity of 20% LD20: output brightness of a display section with a reflectivity of 20% LC80: subject brightness with an reflectivity of 80% LD80: A video display device characterized by satisfying a relationship of output luminance of a display unit having a reflectance of 80%.

The invention according to claim 3 is an imaging unit that images a subject;
A display unit for displaying the captured image;
At illuminance between 1 and 10 lx
The luminance of the subject having a reflectance of 20 to 80% is amplified by 2 to 10000 times and displayed.
The luminance of the subject and the output luminance of the display unit are
L′ 20 / LC20 * LD20 ≧ L′ 80 / LC80 * LD80
L′ 20 = lim (LDx1-LD20) / (LCx1-LC20) LCx1 → LC20
L′ 80 = lim (LDx2-LD80) / (LCx2-LC80) LCx1 → LC80
LCX: subject brightness with an arbitrary reflectivity LDX: output brightness of an arbitrary display section LC20: subject brightness with a reflectivity of 20% LD20: output brightness of a display section with a reflectivity of 20% LC80: subject brightness with an reflectivity of 80% LD80: A video display device characterized by satisfying a relationship of output luminance of a display unit having a reflectance of 80%.

Invention of Claim 4 is equipped with the transparent plate-shaped member holding an eyepiece optical system,
The eyepiece optical system is used in a state where the plate-like member faces the eye of the observer and the light from the display unit is guided to the eye by the eyepiece optical system to display the display unit. 4. The video display device according to claim 1, wherein a virtual image of the recorded video is provided. 5.

The invention according to claim 5 includes a transparent plate-like member that holds the eyepiece optical system and has an optical element portion,
The eyepiece optical system is used in a state where the plate-like member faces the eye of the observer and the light from the display unit is guided to the eye by the eyepiece optical system to display the display unit. The virtual image of the image is provided to the optical element unit, and light from the outside world is transmitted through the optical element unit and guided to the eye to provide an image of the outside world. The video display device according to any one of the above.

  According to a sixth aspect of the present invention, in the video display device according to any one of the first to fifth aspects, the display image of the display unit is an image captured by the imaging unit.

  With the above configuration, the present invention has the following effects.

  According to the first aspect of the present invention, the luminance of a subject having a reflectance of 20 to 80% is amplified by 2 to 10000 times and displayed at an illuminance of 1 to 10 lx, and the luminance of the visual subject is amplified. The visibility at the place can be improved.

  According to the second aspect of the present invention, the luminance of the subject and the output luminance of the display section satisfy a predetermined relationship, and image information having a luminance ratio (contrast) that is optimal for dark behavior can be provided, so that The visibility of can be improved.

  According to the third aspect of the present invention, at an illuminance of 1 to 10 lx, the luminance of a subject having a reflectance of 20 to 80% is amplified and displayed by a factor of 2 to 10000, the luminance of the visual subject is amplified, and By satisfying a predetermined relationship between the brightness and the output brightness of the display unit, the user will behave based on image information that has been amplified and adjusted to the optimum brightness ratio, which dramatically improves the behavior in the dark. Is done.

  According to the fourth aspect of the present invention, the eyepiece optical system is used in a state where the plate-like member faces the eye with the eyepiece optical system positioned in front of the observer's eye, and the light from the display unit is applied to the eye by the eyepiece optical system. It can be used as a head-mounted display by providing a virtual image of the video displayed by the display unit.

  According to the fifth aspect of the present invention, the eyepiece optical system is used in a state where the plate-shaped member faces the eye with the eyepiece optical system positioned in front of the observer's eye, and the light from the display unit is applied to the eye by the eyepiece optical system. It can be used as a head-mounted display, providing a virtual image of the image displayed by the display unit and guiding it to the optical element unit as well as transmitting light from the outside through the optical element unit and guiding it to the eye Furthermore, by giving see-through, it is possible to make a judgment and act from both the direct information of the image of the outside world and the image information displayed by the display unit.

  According to the sixth aspect of the present invention, the display image of the display unit is an image captured by the imaging unit. For example, restrictions on dark places and night behavior can be relaxed by imaging information.

  Embodiments of the video display apparatus according to the present invention will be described below. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this.

[Basic configuration of video display device]
First, a video display apparatus to which the present invention is applied will be described with reference to FIGS. FIG. 1 is a configuration diagram of a video display device, FIGS. 2 and 3 are external views of the video display device, and FIG. 4 is a cross-sectional view of the video display device.

  As shown in FIG. 1, the video display device 1 of this embodiment includes an imaging unit 111 that captures an image of a subject, a display unit 100 that displays an image of the captured subject, an eyepiece optical system 101, and an eyepiece optical system 101. And a transparent plate-like member 102 that holds The display unit 100 has a light source for illuminating. A control unit 110 is connected to the display unit 100. The imaging unit 111 uses a video camera. Imaging information about the subject is input from the imaging unit 111 to the control unit 110. Under the control of the control unit 110, the display unit 100 displays an image of the subject.

  The video display apparatus 1 according to this embodiment is used in a state where the eyepiece optical system 101 is positioned in front of the eye and the plate-like member 102 faces the eye, and the light from the display unit 100 is transmitted to the eye by the eyepiece optical system 101. The virtual image of the video displayed on the display unit 100 by being guided to the eyeball 41 is provided to the optical element unit 102a, and light from the outside is transmitted through the optical element unit 102a of the plate member 102 and guided to the eyeball of the eye 41. Provide an image of the outside world.

  As shown in FIGS. 2 and 3, the video display device 1 of this embodiment is configured as a glasses type and includes an imaging unit, and the photometry unit is also used as the imaging unit, but is not limited thereto.

  The video display device 1 of this embodiment includes one display unit 100, an imaging unit 111, a control unit 110, a pair of left and right prisms 20L and 20R, a nose pad 31, and a pair of left and right temples 32L and 32R. It is mounted in front of the user's face so that 20L and 20R are positioned in front of the left and right eyes 41. The nose pad 31 is attached to the prisms 20L and 20R and connects them.

  The temples 32L and 32R are attached to the ends of the prisms 20L and 20R, respectively. At the time of wearing, the nose pad 31 hits the nose and the temples 32L and 32R hit the ear, the temporal region or the back of the head, and the video display device 1 is supported by these three parts. The temples 32L and 32R can be rotated around a vertical axis (not shown) provided in the vicinity of the prisms 20L and 20R, and can be folded inward when not in use.

  The display unit 100 is attached to the right prism 20R. The display unit 100 includes a transmissive liquid crystal display (LCD) 11, a housing 12, a prism 13, a light emitting diode (LED) 14, and a lens 15. The LCD 11 displays an image to be displayed and modulates illumination light by the displayed image. The housing 12 accommodates and holds the LCD 11, the LED 14, and the lens 15. The LED 14 is a light source for illuminating the LCD 11, and the lens 15 is an illumination optical system for uniformly guiding light emitted from the LED 14 to the entire surface of the LCD 11.

  The display of the image on the LCD 11 and the light emission of the LED 14 are controlled by the control unit 110, image processing is performed on the image information captured by the imaging unit 111, and power and a video signal are supplied.

  The prism 13 has a flat plate shape and is made of transparent glass or resin. The prism 13 guides the light from the LCD 11 to the eye 41 and displays a virtual image of the image displayed on the LCD 11. The upper end portion of the prism 13 has a wedge shape whose edge is thicker than the inner side, and the housing 12 is attached to the prism 13 so as to sandwich the upper end portion of the wedge shape.

  The prism 20L has a flat plate shape and is composed of a single member. The prism 20R is also flat, but is not a single member but is composed of a prism 13 and a prism 21. The prism 20L and the prism 21 are made of the same material as the prism 13, and there is no difference in refractive index between these three. The prism 13 and the prism 21 constituting the prism 20R have complementary shapes, and are joined so that there is no gap and the surface is continuous. Except for the prism 13 having a wedge-shaped upper end, the prisms 20L and 20R are symmetrical as in general glasses. A user wearing the image display device 1 in front of his / her face observes the outside through the prisms 20L and 20R.

  The lower end of the prism 13 is made so that the front surface (surface far from the eye 41) approaches the rear surface (surface close to the eye 41) toward the edge, and has a wedge shape. The front surface of the wedge-shaped portion, that is, the joint surface with the prism 21 is a flat surface, and the hologram element 22 is formed on the flat surface. The hologram element 22 is positioned immediately in front of the eye 41 when worn. The prism 13 and the hologram element 22 constitute an eyepiece optical system 101. The hologram element 22 is composed of, for example, a diffraction film.

  The prism 13 guides the light from the LCD 11 to the inside from the end face of the upper end, and guides the light to the hologram element 22 while being totally reflected a plurality of times on the front face and the rear face. The hologram element 22 diffracts the guided light to make it enter the eye 41 while making it a light beam close to parallel light. Thereby, the virtual image of the image displayed on the LCD 11 is displayed to the user. The hologram element 22 hardly acts on the light from the outside world, and the virtual image is observed while overlapping the central portion of the outside world image.

  In the video display device 1, since the light from the LCD 11 is guided to the hologram element 22 while being reflected inside the prism 13, the prism 20R can be enlarged. Although the lower end of the prism 13 is wedge-shaped, it is joined to the prism 21 made of the same material, so that light from the outside that passes through the lower end of the prism 13 is not refracted. Therefore, the video display device 1 can display a high-quality image without the central portion of the image in the outside world being distorted or discontinuous.

  The LCD 11 has a rectangular shape that is long in the left-right direction, and can display one to several lines of character strings in which dozen characters are arranged in the horizontal direction. Therefore, the user can obtain a lot of information from the video at a time. In this embodiment, the video is displayed on the right eye. Of course, the video may be displayed on the left eye.

  The appearance of another embodiment is shown in FIG. The video display device 1 according to this embodiment includes a pair of display units 100 and 100, displays video on both the left and right eyes, and can give power to the prisms 20L and 20R to correct the user's visual acuity. It is what I did. The configuration of the display units 100 and 100 is the same as that of the display unit 100 of the video display device 1 according to the embodiment of FIGS. 1 to 3 except that the prisms 13L and 13R have curvature.

  The power of the prisms 20L and 20R is set according to the visual acuity of the user. By giving negative power to the prisms 20L and 20R, myopia can be corrected, and by providing positive power, hyperopia can be corrected. The joint surfaces of the lower ends of the prisms 13L and 13R with the prisms 21L and 21R are flat, and the hologram elements 22L and 22R can be easily formed.

[Configuration of the embodiment]
The video display device 1 according to the first embodiment includes an imaging unit 111 that captures an image of a subject and a display unit 100 that displays the captured image. The eyepiece optical system 101 is positioned in front of the eye and has a plate shape. The member 102 is used in a state of facing the eye, guides light from the display unit 100 to the eyeball of the eye 41 by the eyepiece optical system 101, and provides a virtual image of the image displayed on the display unit 100 to the optical element unit 102a. Light from the outside world is transmitted through the optical element portion 102a of the plate member 102 and guided to the eyeball of the eye 41 to provide an image of the outside world.

  In this embodiment, as shown in FIG. 5, the luminance of a subject having a reflectance of 20 to 80% is amplified by 2 to 10000 times and displayed by the control unit 110 at an illuminance in the range of 1 to 10 lx. In FIG. 5, the horizontal axis indicates the luminance of the subject, the vertical axis indicates the output luminance of the display unit 100, and a display characteristic for amplifying the luminance of the subject is indicated as A.

  People with symptoms such as retinitis pigmentosa and glaucoma are less sensitive in dark places and slower in dark adaptation than normal people, so dark places and night behavior are restricted. Although it may not be visible visually, it may feel terrible or fear of walking, but at a low illuminance of 1 to 10 lx, the luminance of the subject with a reflectance of 20 to 80% is amplified by 2 to 10000 times and displayed. The visibility in a dark place can be improved by amplifying the luminance of the visual recognition object. By amplifying and displaying the luminance of a subject having a reflectance of 20 to 80%, it is possible to amplify and display the luminance of the target subject while avoiding the influence of the background as much as possible. By giving it to a person with symptoms such as glaucoma, it is possible to relax restrictions in dark places and night behavior, for example.

  The video display apparatus 1 according to the second embodiment is controlled by the control unit 110, and the luminance of the subject and the output luminance of the display unit 100 satisfy the following relationship. In FIG. 6, the horizontal axis represents the luminance of the subject, the vertical axis represents the output luminance of the display unit 100, and B represents a display characteristic that satisfies the following relationship between the luminance of the subject and the output luminance of the display unit 100.

L′ 20 / LC20 * LD20 ≧ L′ 80 / LC80 * LD80
L′ 20 = lim (LDx1-LD20) / (LCx1-LC20) LCx1 → LC20
L′ 80 = lim (LDx2-LD80) / (LCx2-LC80) LCx1 → LC80
LCX: subject brightness with an arbitrary reflectivity LDX: output brightness of an arbitrary display section LC20: subject brightness with a reflectivity of 20% LD20: output brightness of a display section with a reflectivity of 20% LC80: subject brightness with an reflectivity of 80% LD80: Output luminance of display unit with 80% reflectance The luminance of the subject and the output luminance of the display unit 100 satisfy a predetermined relationship, and the luminance ratio (contrast) is optimal for the darkness behavior of the subject with 20% to 80% reflectance. By providing image information, visibility in a dark place can be improved.

  As shown in FIG. 7, the video display device 1 according to the third embodiment is configured such that the luminance of an object having a reflectance of 20 to 80% is doubled to 10000 by the control unit 110 at an illuminance in the range of 1 to 10 lx. The luminance of the subject and the output luminance of the display unit 100 satisfy the following relationship. In FIG. 7, the horizontal axis represents the luminance of the subject, the vertical axis represents the output luminance of the display unit 100, and C represents a display characteristic that satisfies the following relationship between the luminance of the subject and the output luminance of the display unit 100.

L′ 20 / LC20 * LD20 ≧ L′ 80 / LC80 * LD80
L′ 20 = lim (LDx1-LD20) / (LCx1-LC20) LCx1 → LC20
L′ 80 = lim (LDx2-LD80) / (LCx2-LC80) LCx1 → LC80
LCX: subject brightness with an arbitrary reflectivity LDX: output brightness of an arbitrary display section LC20: subject brightness with a reflectivity of 20% LD20: output brightness of a display section with a reflectivity of 20% LC80: subject brightness with an reflectivity of 80% LD80: The output luminance relationship of the display unit with a reflectance of 80% is satisfied.

  At low illuminance of 1 to 10 lx, the luminance of a subject with a reflectance of 20 to 80% is amplified by 2 to 10000 times, and the luminance of the subject and the output luminance of the display unit satisfy a predetermined relationship, thereby affecting the influence of the background. It avoids as much as possible and amplifies the brightness of the target subject and provides image information with an optimal brightness ratio (contrast). For this reason, a person with symptoms such as retinal pigment degeneration or glaucoma can act based on image information adjusted to have an amplified luminance and an optimum luminance ratio, and the behavior in the dark can be dramatically improved.

  In this embodiment, light from the display unit 100 is guided to the eye by the eyepiece optical system 101 to provide a virtual image of an image displayed on the display unit 100 to the optical element unit 102a, and light from the outside world is supplied to the optical element unit 102a. However, the present invention is not limited to this, and light from the display unit 100 is guided to the eye by an eyepiece optical system to provide a virtual image of the image displayed on the display unit 100. It can also be used as a head mounted display that does not transmit light from the head.

  In addition, the light from the display unit 100 is guided to the eye by the eyepiece optical system to provide a virtual image of the image displayed on the display unit 100 to the optical element unit 102a, and light from the outside is transmitted through the optical element unit 102a to the eye. By providing the image of the outside world by providing it and using it as a head-mounted display and further imparting see-through property, it is possible to make a judgment and act from both the direct information of the image of the outside world and the image information displayed on the display unit 100.

  In addition, the display image of the display unit 100 is an image captured by the imaging unit. For example, restrictions on dark places and night behavior can be relaxed by imaging information.

  This video display device amplifies the luminance of a subject having a reflectance of 20 to 80% at an illuminance of 1 to 10 lx by a factor of 2 to 10,000, and amplifies the luminance of the subject to be viewed. Can be improved. In addition, the visibility in a dark place can be improved by providing image information with a brightness ratio (contrast) that is optimal for dark place behavior, where the brightness of the subject and the output brightness of the display unit satisfy a predetermined relationship. .

It is a block diagram of a video display apparatus. It is a figure which shows the external appearance of a video display apparatus. It is sectional drawing containing the display part of a video display apparatus. It is a figure of other embodiment which shows the external appearance of a video display apparatus. It is a figure which shows the display characteristic A of a video display apparatus. It is a figure which shows the display characteristic B of a video display apparatus. It is a figure which shows the display characteristic C of a video display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image display apparatus 100 Display part 101 Eyepiece optical system 102 Plate member 102a Optical element part 110 Control part 111 Imaging part

Claims (6)

An imaging unit for imaging a subject;
A display unit for displaying the captured image;
At illuminance between 1 and 10 lx
An image display device, wherein the luminance of the subject having a reflectance of 20 to 80% is amplified by 2 to 10000 times and displayed. An imaging unit for imaging a subject;
A display unit for displaying the captured image;
The luminance of the subject and the output luminance of the display unit are
L′ 20 / LC20 * LD20 ≧ L′ 80 / LC80 * LD80
L′ 20 = lim (LDx1-LD20) / (LCx1-LC20) LCx1 → LC20
L′ 80 = lim (LDx2-LD80) / (LCx2-LC80) LCx1 → LC80
LCX: subject brightness with an arbitrary reflectivity LDX: output brightness of an arbitrary display section LC20: subject brightness with a reflectivity of 20% LD20: output brightness of a display section with a reflectivity of 20% LC80: subject brightness with an reflectivity of 80% LD80: An image display device characterized by satisfying a relationship of output luminance of a display unit having a reflectance of 80%. An imaging unit for imaging a subject;
A display unit for displaying the captured image;
At illuminance between 1 and 10 lx
The luminance of the subject having a reflectance of 20 to 80% is amplified by 2 to 10000 times and displayed.
The luminance of the subject and the output luminance of the display unit are
L′ 20 / LC20 * LD20 ≧ L′ 80 / LC80 * LD80
L′ 20 = lim (LDx1-LD20) / (LCx1-LC20) LCx1 → LC20
L′ 80 = lim (LDx2-LD80) / (LCx2-LC80) LCx1 → LC80
LCX: subject brightness with an arbitrary reflectivity LDX: output brightness of an arbitrary display section LC20: subject brightness with a reflectivity of 20% LD20: output brightness of a display section with a reflectivity of 20% LC80: subject brightness with an reflectivity of 80% LD80: An image display device characterized by satisfying a relationship of output luminance of a display unit having a reflectance of 80%. A transparent plate-like member that holds the eyepiece optical system;
The eyepiece optical system is used in a state where the plate-like member faces the eye of the observer and the light from the display unit is guided to the eye by the eyepiece optical system to display the display unit. The video display device according to claim 1, wherein a virtual image of the recorded video is provided. A transparent plate-like member that holds an eyepiece optical system and has an optical element portion is provided,
The eyepiece optical system is used in a state where the plate-like member faces the eye of the observer and the light from the display unit is guided to the eye by the eyepiece optical system to display the display unit. The virtual image of the image is provided to the optical element unit, and light from the outside world is transmitted through the optical element unit and guided to the eye to provide an image of the outside world. The video display device according to any one of the above. The video display device according to claim 1, wherein the display image of the display unit is an image captured by an imaging unit.

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