JP2013015695A - Display and head-mounted display - Google Patents

Abstract

An object of the present invention is to provide a head-mounted display device capable of reducing the size and weight of the device and performing three-dimensional display.
A first light L1 having a plurality of light emitting elements and showing a right-eye image, and a second light L2 having the same color as the first light L1 but having a different peak wavelength and showing a left-eye image , The wavelength separation element 4 that transmits one of the first light L1 and the second light L2 and reflects the other, and the first through the wavelength separation element 4. Light guide L5 that guides the second light through the wavelength separation optical system to the left eye of the observer.
[Selection] Figure 1

Description

  The present invention relates to a display device and a head-mounted display device.

  In recent years, head mounted displays (head mounted display devices, hereinafter referred to as HMDs) have become widespread. In general, as the HMD, a binocular HMD that allows an observer to observe an image displayed on a pair of left and right image display devices with both eyes is employed (see, for example, Patent Document 1). When an observer wears such a binocular HMD, the observer superimposes the left and right display images and observes them as one image.

  However, since the HMD described in Patent Document 1 includes a pair of left and right image display devices, a pair of left and right circuits and the like associated with the image display device are required, and the entire device tends to be large.

  In view of this, there has been proposed an HMD that uses one image display device and divides a displayed image into a right-eye image and a left-eye image using a half mirror (see, for example, Patent Document 2). In such an HMD, the device configuration is simplified compared to an HMD having a pair of left and right image display devices, so that the entire device can be reduced in size and weight.

JP 2002-277818 A JP-A-8-212326

  By the way, in recent years, a technique for three-dimensionally expressing a display image has been developed and put into practical use. As such a technique, for example, a parallax in which an observer observes a left-eye image and a right-eye image created by shifting the binocular parallax corresponding to both human eyes, respectively, with the left eye and the right eye. The method of use can be mentioned.

  Assuming that stereoscopic display is performed using an HMD, a device including a pair of left and right image display devices can display a left-eye image and a right-eye image independently, and thus can be easily realized. . On the other hand, in an HMD configured as described in Patent Document 2 using one image display device in order to reduce the size and weight of the device, an image displayed on one image display device is a half mirror. Since the image is divided, the same image is displayed on the left and right, and stereoscopic display cannot be realized.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a head-mounted display device capable of reducing the size and weight of the device and performing three-dimensional display. . It is another object of the present invention to provide a display device that is suitably used for such a head-mounted display device and contributes to downsizing of the entire device.

  In order to solve the above-described problem, a head-mounted display device of the present invention has a plurality of light emitting elements, a first light indicating a right-eye image, the same color as the first light, and a peak wavelength. Are different from each other, a display device that emits the second light indicating the left-eye image, and a wavelength separation optical system that transmits one of the first light and the second light and reflects the other And a light guide unit that guides the first light through the wavelength separation optical system to the right eye of the observer and guides the second light through the wavelength separation optical system to the left eye of the observer. Prepare.

  According to this configuration, the right-eye image expressed by the first light and the left-eye image expressed by the second light are displayed on the single display device, and are satisfactorily separated by the wavelength separation optical system. Can lead to different directions. Therefore, it is possible to provide a head-mounted display device that achieves good stereoscopic display while reducing the size and weight of the device.

In the present invention, the light emitting element includes a first sub light emitting element that emits the first light and a second sub light emitting element that emits the second light, and the first light emitting element emits the first light. The sub-light-emitting element and the second sub-light-emitting element each have a light-emitting layer sandwiched between a pair of electrodes, a reflective surface provided on one side of the pair of electrodes, and a transflective provided on the other side. A semi-reflective surface, and an optical resonator is formed between the reflective surface and the semi-transmissive semi-reflective surface, and the first sub-light-emitting element is the second sub-light-emitting element. It is desirable to set different resonance lengths.
According to this configuration, the wavelength band width (for example, half-value width) can be narrowed for each of the first light and the second light. Therefore, the overlapping portion between the wavelength band of the first light and the wavelength band of the second light is reduced or eliminated, so that the separation in the wavelength separation optical system is facilitated, and a good image in which so-called crosstalk is suppressed. Display is possible.

In the present invention, the resonance length of the first sub-light-emitting element is set to the center wavelength of the first light, and the resonance length of the second sub-light-emitting element is set to the center wavelength of the second light. It is desirable that it is set.
According to this configuration, since the resonance wavelengths of the first sub-light-emitting element and the second sub-light-emitting element are the first light and the second light, it is possible to display an image with high color purity and high quality. .

In the present invention, the light emitting element is provided facing the first sub light emitting element in the light extraction direction, and absorbs a part of the light and transmits the first light. And a second colored layer provided opposite to the second sub-light-emitting element in the light extraction direction and absorbing part of the light and transmitting the second light.
According to this configuration, a light emitting element that emits the first light and the second light can be easily formed by using a colored layer having desired absorption characteristics.

In the present invention, the light emitting element is provided opposite to the first sub light emitting element in the light extraction direction, and reflects a part of the light and transmits the first light. A film and a second wavelength separation film provided opposite to the second sub-light-emitting element in the light extraction direction and reflecting part of the light and transmitting the second light. desirable.
According to this configuration, a light emitting element that emits the first light and the second light can be easily formed by using the wavelength separation film having desired reflection and transmission characteristics.

In the present invention, it is preferable that the plurality of light emitting elements include a first light emitting element that emits blue light, a second light emitting element that emits green light, and a third light emitting element that emits red light. .
According to this configuration, full color display is possible.

In the present invention, a peak wavelength of the first color light relating to the blue light is longer than a peak wavelength of the second color light relating to the blue light, and the first color light relating to the green light. The peak wavelength of the first color light of the green light is shorter than the peak wavelength of the second color light of the green light, and the wavelength separation optical system includes the peak wavelength of the first color light of the blue light and the green light. It is desirable to transmit light having a continuous peak wavelength including the peak wavelength of the first color light according to the above.
According to this configuration, the configuration of the wavelength separation optical system can be simplified.

In the present invention, a peak wavelength of the second color light relating to the green light is longer than a peak wavelength of the first color light relating to the green light, and the second color light relating to the red light. The peak wavelength of the first color light related to the red light is shorter than the peak wavelength of the first color light, and the separation optical system includes the peak wavelength of the second color light related to the green light and the red light. It is desirable to reflect light having a continuous peak wavelength including the peak wavelength of the second color light.
According to this configuration, the configuration of the wavelength separation optical system can be simplified.

Further, in the present invention, a peak wavelength of the second color light related to the blue light is longer than a peak wavelength of the first color light related to the blue light, and the second wavelength related to the green light. The peak wavelength of the color light is shorter than the peak wavelength of the first color light related to the green light, and the separation optical system includes the peak wavelength of the second color light related to the blue light and the green light. It is good also as reflecting the light of the continuous peak wavelength containing the peak wavelength with said 2nd color light which concerns on light.
According to this configuration, the configuration of the wavelength separation optical system can be simplified.

In the present invention, a peak wavelength of the first color light relating to the green light is longer than a peak wavelength of the second color light relating to the green light, and the first color light relating to the red light. The peak wavelength is shorter than the peak wavelength of the second color light related to the red light, and the separation optical system includes a peak wavelength of the first color light related to the green light and the red light. It is good also as transmitting the light of the continuous peak wavelength containing the peak wavelength with the said 1st color light which concerns.
According to this configuration, the configuration of the wavelength separation optical system can be simplified.

Further, the display device according to the present invention includes a plurality of light emitting elements each including an anode, a cathode facing the anode, and a light emitting layer sandwiched between the anode and the cathode. A first sub-light-emitting element that emits first light; and a second sub-light-emitting element that emits second light having the same color as the first light but having a different peak wavelength.
According to this configuration, the display image expressed by the first light and the display image expressed by the second light can be displayed on one display device. Therefore, when this display device is applied to a head-mounted display device, the entire device can be reduced in size and weight.

In the present invention, the light emitting element has an optical resonator structure formed between a reflective surface provided on the anode side and a transflective surface provided on the cathode side, The first sub light emitting element preferably has a resonance length different from that of the second sub light emitting element.
According to this configuration, the wavelength band width (for example, half-value width) can be narrowed for each of the first light and the second light. Therefore, when this display device is applied to a head-mounted display device, it is possible to easily enable good image display in which crosstalk is suppressed.

In the present invention, the resonance length of the first sub-light-emitting element is set to the center wavelength of the first light, and the resonance length of the second sub-light-emitting element is set to the center wavelength of the second light. It is desirable that it is set.
According to this configuration, since the resonance wavelengths of the first sub-light-emitting element and the second sub-light-emitting element are the first light and the second light, it is possible to display a mixed quality image with high color purity. .

In the present invention, the light emitting element is provided facing the first sub light emitting element in the light extraction direction, and absorbs a part of the light and transmits the first light. And a second colored layer provided opposite to the second sub-light-emitting element in the light extraction direction and absorbing part of the light and transmitting the second light.
According to this configuration, a light emitting element that emits the first light and the second light can be easily formed by using a colored layer having desired absorption characteristics.

In the present invention, the light emitting element is provided opposite to the first sub light emitting element in the light extraction direction, and reflects a part of the light and transmits the first light. A film and a second wavelength separation film provided opposite to the second sub-light-emitting element in the light extraction direction and reflecting part of the light and transmitting the second light. desirable.
According to this configuration, a light emitting element that emits the first light and the second light can be easily formed by using the wavelength separation film having desired reflection and transmission characteristics.

In the present invention, it is preferable that the plurality of light emitting elements include a first light emitting element that emits blue light, a second light emitting element that emits green light, and a third light emitting element that emits red light. .
According to this configuration, full color display is possible.

It is a figure which shows the head mounted display apparatus of this embodiment. It is a top view which shows the pixel of an image formation part. It is a schematic diagram which shows the structure of each sub pixel of an image formation part. It is the emission spectrum of the light inject | emitted from a light emission part. It is an emission spectrum of colored light emitted from each sub-pixel. It is a reflection and transmission spectrum of the dichroic mirror of this embodiment. It is an emission spectrum of the colored light separated through the wavelength separation element. It is a reflection and transmission spectrum of the dichroic mirror 8 of this embodiment. It is a schematic diagram which shows the structure of each sub pixel of the image formation part 9 of this embodiment. It is the emission spectrum of the color light inject | emitted from the organic EL element of each sub pixel. It is a graph shown about the optical characteristic of the color light inject | emitted through a colored layer. It is a graph shown about the optical characteristic of the color light inject | emitted through a colored layer. It is a graph shown about the optical characteristic of the color light inject | emitted through a colored layer. It is an emission spectrum of the colored light separated through the wavelength separation element. 2 is a circuit diagram illustrating a configuration of sub-pixels of an image forming unit in the present embodiment.

[First Embodiment]
Hereinafter, a display device and a head-mounted display device (head mounted display) according to a first embodiment of the present invention will be described with reference to FIGS. In all the drawings below, the dimensions and ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.

  FIG. 1 is a diagram showing a head-mounted display (head-mounted display device) 1 according to this embodiment. The head mounted display 1 shown in FIG. 1 can display different left-eye images and right-eye images separately for the left and right eyes of the observer. The left-eye image and the right-eye image are, for example, images that take into account the parallax between both eyes, and the observer can observe a 3D image.

  The head-mounted display 1 displays the left-eye image and the right-eye image that is the same as the left-eye image in addition to the left-eye image and the right-eye image that are different from each other as described above. It has a display mode and can display normal images.

  The head mounted display 1 includes an image forming unit (display device) 2 that emits a first light L1 indicating a right-eye image and a second light L2 indicating a left-eye image, and a first light emitted from the image forming unit 2. The image forming unit 3 disposed at a position where the first light L1 and the second light L2 are incident, and the first light L1 and the second light L2 that have passed through the image forming unit 3 are disposed at a position, A wavelength separation element (wavelength separation optical system) 4 that separates the first light L1 and the second light L2, and a light guide 5 that guides the light that has passed through the wavelength separation element 4 to the left and right eyes of the observer; A drive unit 6 that drives the image forming unit 2 is provided.

  The image forming unit 2 is an organic electroluminescence device (organic EL device). The first light L1 and the second light L2 emitted from the image forming unit 2 are lights having the same color and different wavelengths. In the image forming unit 2, a right-eye image and a left-eye image are formed using light having different wavelengths. The configuration of the image forming unit 2 will be described in detail later.

  The drive unit 6 receives image data from a signal source such as a DVD player, a PC, or a portable information terminal outside the head-mounted display 1 by wire or wireless, and supplies an image signal to the image forming unit 2.

  In the imaging unit 3, the first light L1 that has passed through the light guide unit 5 forms an image with the right eye of the observer, and the second light L2 that has passed through the light guide unit 5 forms an image with the left eye of the viewer. Then, the lights L1 and L2 emitted from the image forming unit 2 are refracted. The imaging unit 3 includes a plurality of lenses and the like.

  As described above, the relative position of the image forming unit 2 with respect to the positions of the eyes of the observer wearing the head mounted display 1 is determined by the shape and dimensions of the frame. The imaging unit 3 can be appropriately designed based on the relative positions of the observer's eyes and the image forming unit 2 so that the light emitted from the image forming unit 2 forms an image with the left or right eye of the viewer. . Note that the image forming unit 3 may form an image of the light emitted from the image forming unit 2 within an allowable range such that blurring is not recognized by the observer.

  The wavelength separation element 4 is provided on a columnar prism 7 made of a light-transmitting material and having a substantially right-angled isosceles triangle section, and a surface (hereinafter referred to as a slope) that forms a hypotenuse in the sectional shape of the prism 7. The dichroic mirror 8 is provided. The wavelength separation element 4 shown in the figure has a rectangular parallelepiped outer shape in which another prism 7 is used and the inclined surfaces of the two prisms 7 are bonded together. The dichroic mirror 8 is inclined at an angle of approximately 45 ° with respect to the optical axis of the imaging unit 3.

  The dichroic mirror 8 separates the first light L1 and the second light L2 by reflecting one and transmitting the other based on the difference in wavelength between the first light L1 and the second light L2. In the figure, the first light L 1 is reflected by the dichroic mirror 8, and the second light L 2 is transmitted through the dichroic mirror 8. In this way, the wavelength separation element 4 separates the first light L1 and the second light L2.

  The light guide 5 includes a right-eye light guide 11 that guides the first light L1 reflected by the wavelength separation element 4 to the right eye of the observer, and a second light L2 that has passed through the wavelength separation element 4 to the left eye of the observer. And a left-eye light guide portion 12 for guiding to the left.

  The right-eye light guide 11 includes a lens 13R disposed at a position where the first light L1 reflected by the dichroic mirror 8 is incident, and a mirror 14R disposed at a position where the light passing through the lens 13R is incident. Including.

  The left-eye light guide unit 12 is arranged at a position where the prism 15 arranged at a position where the second light L2 transmitted through the dichroic mirror 8 is incident and a position where the second light L2 reflected by the prism 15 is incident. And a mirror 14L disposed at a position where the second light L2 that has passed through the lens 13L is incident.

  The prism 15 has a columnar shape with a substantially right-angled isosceles triangle, and is arranged so that a surface including one of two sides orthogonal to each other is in contact with the outer surface of the wavelength separation element 4. The outer surface is a surface from which the second light L2 emitted from the image forming unit 2 and transmitted through the dichroic mirror 8 is emitted.

  The prism 15 is made of a dielectric such as glass, and has a refractive index substantially the same as that of the prism 7 of the wavelength separation element 4, for example. That is, the prism 7 and the prism 15 are optically substantially continuous, and light refraction and reflection at the interface between the prism 7 and the prism 15 are suppressed.

  The inclined surface 16 of the prism 15 is orthogonal to the dichroic mirror 8 of the wavelength separation element 4 and is inclined at an angle of approximately 45 ° with respect to the traveling direction of the light transmitted through the dichroic mirror 8. The light transmitted through the dichroic mirror 8 is reflected by the slope 16 when the slope 16 satisfies the total reflection condition.

  The lens 13R and the lens 13L are provided between the optical path length between the imaging plane (right eye) of the first light L1 and the dichroic mirror 8, and between the imaging plane (left eye) of the second light L2 and the dichroic mirror 8. It is provided so as to correct the defocus due to the difference between the optical path length and the optical path length. If it is not necessary to correct the defocus, these can be omitted.

  The mirror 14R is disposed so as to reflect the light passing through the lens 13R toward the right eye of the observer. Further, the mirror 14L is disposed so as to reflect the light passing through the lens 13L toward the left eye of the observer.

Each part of the head-mounted display 1 is attached to, for example, an eyeglass-shaped frame (not shown) that constitutes a part of the head-mounted display 1. When the observer wears this frame, the relative position between the left eye or right eye of the observer and each part of the head mounted display 1 is fixed.
The schematic configuration of the head mounted display 1 of the present embodiment is as described above.

  Next, the configuration of the image forming unit 2 and the function of the wavelength separation element 4 will be described, and image display using the head mounted display 1 will be described in detail.

  FIG. 2 is a plan view showing pixels of the image forming unit 2. In the figure, the image forming unit 2 is shown as an organic EL device capable of emitting full-color display by emitting light of three colors of red (R), green (G), and blue (B).

  As shown in the figure, the pixel P includes two blue sub-pixels (first sub-light-emitting element, first light-emitting element) B1, which emit blue light, and sub-pixels (second sub-light-emitting element, first light-emitting element). ) B2, two green sub-pixels emitting green light (first sub-light-emitting element, first light-emitting element) G1, sub-pixel (second sub-light-emitting element, first light-emitting element) G2, and red light Are composed of two red sub-pixels (first sub-light-emitting element, first light-emitting element) R1 and sub-pixel (second sub-light-emitting element, first light-emitting element) R2. Among these, the first light L1 is emitted from the sub-pixels R1, G1, and B1 to form a right-eye image, and the second light L2 is emitted from the sub-pixels R2, G2, and B2 to the left-eye. An image is formed.

  That is, the first red light RL1 that is the first light is emitted from the sub-pixel R1, and the second red light RL2 that is the second light is emitted from the sub-pixel R2. Similarly, the first green light GL1 that is the first light is emitted from the sub-pixel G1, and the second green light GL2 that is the second light is emitted from the sub-pixel G2. Further, the first blue light BL1 that is the first light is emitted from the sub-pixel B1, and the second blue light BL2 that is the second light is emitted from the sub-pixel B2. In the present embodiment, the following explanation will be given on the assumption that the first light is light having a longer wavelength than the second light.

  In the figure, the sub-pixels are arranged in a matrix direction, and in one direction (row direction), sub-pixels having different colors are repeatedly provided in the order of red sub-pixel, green sub-pixel, and blue sub-pixel. It has been. Furthermore, subpixels R1, G1, and B1 that emit the first light L1 and subpixels R2, G2, and B2 that emit the second light L2 are provided along the same array axis.

  Further, sub-pixels of the same color are arranged in a direction (column direction) intersecting the row direction, and sub-pixels emitting the first light L1 and sub-pixels emitting the second light L2 are alternately arranged. Is provided.

  The pixel arrangement shown in FIG. 2 is an example, and other arrangements may be used. For example, the arrangement of the sub-pixels in the column direction is the same as that in FIG. 2, and the sub-pixels that emit the first light L1 and the second sub-pixels R1, G2, B1, R2,. Alternatively, the sub-pixels that emit the light L2 may be alternately arranged. In this case, the sub-pixels R1, G1, and B1 that emit the first light L1 and the sub-pixels R2, G2, and B2 that emit the second light L2 are arranged in a staggered manner, and the image quality of the display image is improved.

  Each of such sub-pixels is formed of an organic electroluminescence element (hereinafter referred to as an organic EL element), and the above-described image forming unit 2 that emits each color light is configured by appropriately changing the configuration of the organic EL element. doing.

  FIG. 3 is a schematic diagram illustrating a configuration of each sub-pixel of the image forming unit 2. As shown in the figure, the sub-pixels of the image forming unit 2 include a substrate 20 on which a driving element (not shown) and the like are formed, and a pixel electrode (a pair of electrodes and a reflective surface) 21 formed on the substrate 20 and having light transmittance. And a cathode (a pair of electrodes, semi-transparent semi-reflective surface) 22 provided opposite to the pixel electrode 21 and a light emitting portion (light emitting layer) 23 sandwiched between the pixel electrode 21 and the cathode 22. Yes. The pixel electrode 21, the light emitting unit 23, and the cathode 22 cooperate to form an organic EL element (light emitting element). The cathode 22 of this embodiment is composed of a plurality of layers as will be described later.

  In addition to the light emitting portion 23, a hole injection layer 24, a hole transport layer 25, a carrier transport layer 26, and an electron injection layer 27 are formed between the pixel electrode 21 and the cathode 22.

  The organic EL device employed in the image forming unit 2 of the present embodiment employs a top emission system in which light L generated by the light emitting unit 23 is emitted to the outside through the cathode 22. Hereinafter, each component will be described in order.

  As the substrate body constituting the substrate 20, any of a transparent substrate having light transmittance and an opaque substrate having no light transmittance can be used. As such a substrate, for example, an inorganic substance such as glass, quartz glass, or silicon nitride, or an organic polymer (resin) such as an acrylic resin or a polycarbonate resin can be used. A composite material formed by laminating or mixing these materials can also be used.

  A pixel electrode 21 is formed on the substrate 20. The pixel electrode 21 includes a light-reflective first layer formed on the substrate 20 side, and a light-transmitting second layer stacked on the first layer. An example of the material for forming the first layer is aluminum, and an example of the material for forming the second layer is a metal oxide such as ITO (Indium Tin Oxide).

  A hole injection layer 24 as a charge transfer layer that facilitates injection of holes from the pixel electrode 21 is formed on the pixel electrode 21, and a hole transport layer 25 is formed on the hole injection layer 24. Is formed.

  On the hole transport layer 25, a light emitting portion 23 is formed. The light emitting unit 23 includes, in order from the hole transport layer 25 side, a red light emitting layer 23R that emits red light, a carrier transport layer 26, a blue light emitting layer 23B that emits blue light, and a green light emitting layer 23G that emits green light. It is formed by stacking. Each light emitting layer of the light emitting unit 23 is designed so that red light, blue light, and green light emitted from each of the light emitting parts 23 are mixed to become white light.

  Further, an electron injection layer 27 that facilitates injection of electrons from the cathode 22 is formed on the light emitting portion 23. As a material for forming each layer formed between the pixel electrode 21 and the cathode 22, a commonly known material can be used.

  A cathode 22 is formed on the electron injection layer 27. The cathode 22 is formed using a co-evaporated layer formed by co-evaporation of Mg (magnesium) and Ag (silver).

  Such a cathode 22 has transflective properties by controlling the co-evaporation ratio of Mg and Ag and the film thickness. As a result, the pixel electrode 21 and the cathode 22 constitute an optical resonance structure that resonates the light emitted from the light emitting unit 23, and a resonance wavelength condition corresponding to the optical distance between the pixel electrode 21 and the cathode 22. Only light that satisfies the above condition is amplified, and color light having a specific peak wavelength is extracted from the cathode 22 side.

  In the image forming unit 2 having such a configuration, for example, by changing the film thickness of the light-transmissive second layer constituting the pixel electrode 21 and changing the separation distance between the pixel electrode 21 and the cathode 22, The resonance wavelength can be changed for each pixel, and the wavelength of light emitted from each sub-pixel can be controlled.

An inorganic film such as SiO _x N _y (not shown) is formed on the cathode 22, and a glass substrate is bonded on the inorganic film through an epoxy resin. Good.

  FIG. 4 is a graph showing an example of an emission spectrum of light emitted from the light emitting unit 23, and FIG. 5 is a graph showing an example of an emission spectrum of colored light emitted from each sub-pixel. FIG. 5A is a graph showing the first blue light BL1 and the second blue light BL2 emitted from the sub-pixels B1 and B2. FIG. 5B is emitted from the sub-pixels G1 and G2. FIG. 5C is a graph showing the first green light GL1 and the second green light GL2, and FIG. 5C is a graph showing the first red light RL1 and the second red light RL2 emitted from the sub-pixels R1 and R2. is there. In each graph, the horizontal axis represents wavelength, and the vertical axis represents light intensity.

  As shown in FIG. 4, the light emitted from the light emitting unit 23 becomes white light by mixing red light, blue light, and green light.

  On the other hand, in the organic EL element that constitutes each sub-pixel, by changing the separation distance between the pixel electrode 21 and the cathode 22, it is possible to emit colored light of various wavelengths as shown in FIG. For example, in the sub-pixels B1 and B2 that emit blue light, the peak wavelength of each light shown in FIG. 5A is set to be the center wavelength of the wavelength band of the first blue light BL1 and the second blue light BL2, respectively. The optical resonator structure is set. Similarly, in the sub-pixel that emits green light and the sub-pixel that emits red light, the peak wavelength of each light is the center wavelength of each color light.

  That is, the image forming unit 2 configured as described above preferably emits the first light L1 (right-eye image) and the second light L2 (left-eye image) using color lights having different wavelengths. it can.

  The first light L 1 and the second light L 2 emitted in this way are separated by the dichroic mirror 8 of the wavelength separation element 4.

  FIG. 6 is a graph showing the reflection / transmission spectrum of the dichroic mirror 8 of the present embodiment, in which the horizontal axis indicates the wavelength and the vertical axis indicates the reflectance at each wavelength.

  As shown in the figure, the dichroic mirror 8 has a reflection / transmission characteristic that reflects most of the first blue light BL1 and transmits most of the second blue light BL2. Similarly, the dichroic mirror 8 reflects most of the first green light GL1, transmits most of the second green light GL2, reflects most of the first red light RL1, and transmits most of the second red light RL2. It has such reflection / transmission characteristics.

  By passing through such a dichroic mirror 8, the first light (first blue light BL1, first green light GL1, first red light RL1) showing the image for the right eye is reflected by the dichroic mirror 8 and is shown in FIG. The second light (second blue light BL2, second green light GL2, and second red light RL2) indicating the left-eye image is transmitted through the dichroic mirror 8 while entering the right-eye light guide 11 shown in FIG. The light enters the left-eye light guide 12 shown in FIG.

  FIG. 7 is a graph showing an example of the emission spectrum of the color light separated through the dichroic mirror 8, and is a graph corresponding to FIG. The head mounted display 1 displays the right eye image using the first light (first blue light BL1, first green light GL1, first red light RL1) that can be separated as described above. The left-eye image can be displayed using two lights (second blue light BL2, second green light GL2, and second red light RL2).

  The head mounted display 1 configured as described above can separately observe the left-eye image and the right-eye image formed by the same image forming unit 2 with the left eye and the right eye, respectively. Therefore, the apparatus can be reduced in size and weight as compared with the configuration in which the image forming unit for the left eye and the image forming unit for the right eye are separately provided.

  Moreover, in the head mounted display of this embodiment, since 1st light and 2nd light are formed using an optical resonance structure, it is easy to isolate | separate 1st light and 2nd light. Therefore, the right eye image displayed using the first light and the left eye image displayed using the second light can be prevented from being mixed and observed (crosstalk). Therefore, high-quality image display can be realized.

  In the image forming unit 2 having the above-described configuration, the display image expressed by the first light and the display image expressed by the second light can be displayed by one apparatus. Therefore, the head mounted display can be reduced in size and weight.

  In the present embodiment, the first light L1 that forms the image for the right eye in each color light has a longer wavelength than the second light L2 that forms the image for the left eye, but the present invention is not limited to this. For example, in green light, the first light (first green light GL1) may be light having a shorter wavelength than the second light (second green light GL2).

  In this case, the reflection / transmission spectrum of the dichroic mirror used is as shown in FIG. FIG. 8 is a graph corresponding to FIG.

  That is, assuming that the first light (first green light GL1) has a shorter wavelength than the second light (second green light GL2), the dichroic mirror to be used has a wavelength band that reflects light. And the number of wavelength bands that transmit light are continuous wavelength bands that reflect the first blue light BL1 and the first green light GL1, and transmit the second green light GL2 and the second red light RL2. The wavelength band to be continued. Therefore, the reflection / transmission spectrum is simplified, and the dichroic mirror to be used can be easily configured.

  In FIG. 8, the first blue light BL1 has a longer wavelength than the second blue light BL2, the first green light GL1 has a shorter wavelength than the second green light GL2, and the first red light RL1 However, the present invention is not limited to this, although the wavelength is longer than that of the second red light RL2. That is, the first blue light BL1 has a shorter wavelength than the second blue light BL2, the first green light GL1 has a longer wavelength than the second green light GL2, and the first red light RL1 has a second red color. The wavelength may be shorter than that of the light RL2.

[Second Embodiment]
FIGS. 9-14 is explanatory drawing of the head mounted display which concerns on 2nd Embodiment of this invention. In the present embodiment, a part of the head mounted display 1 of the first embodiment is partially shared, and the configuration of the organic EL element of the image forming unit and the characteristics of the dichroic mirror included in the wavelength separation element are different. Therefore, in the present embodiment, these differences will be described in detail. In the present embodiment, the same reference numerals are given to components common to the first embodiment, and detailed description thereof is omitted.

  FIG. 9 is a schematic diagram illustrating a configuration of each sub-pixel of the image forming unit 9 of the present embodiment, and corresponds to FIG. 3 of the first embodiment. In the figure, the sub-pixels B1 and B2 that emit blue light will be described. However, the same configuration is adopted for the sub-pixel that emits green light and the sub-pixel that emits red light.

  In the image forming unit 9 of the present embodiment, the separation distance between the pixel electrode 211 and the cathode 22 included in the sub pixel B1 and the separation distance between the pixel electrode 212 and the cathode 22 included in the sub pixel B2 are the same. Both are equal so as to emit blue light BL having a peak wavelength.

  Similarly, in the image forming unit 9 of the present embodiment, in the sub-pixel that emits green light (corresponding to the sub-pixels G1 and G2 shown in FIG. 2), the separation distance between the pixel electrode 212 and the cathode 22 is In a sub-pixel that is designed to emit green light having the same peak wavelength and emits red light (corresponding to the sub-pixels R1 and R2 shown in FIG. 2), the separation distance between the pixel electrode 212 and the cathode 22 is Designed to emit red light with the same peak wavelength.

  In the image forming unit 9, a color filter layer 29 through which light L emitted outside through the cathode 22 is transmitted is provided above the cathode 22. The color filter layer 29 includes a first colored layer 291 corresponding to the sub-pixel B1 and a second colored layer 292 corresponding to the sub-pixel B2.

  The first colored layer 291 has an optical characteristic of transmitting the first blue light BL1 and absorbing the second blue light BL2. Therefore, as shown in FIG. 9, the light emitted to the outside through the first colored layer 291 becomes the first blue light BL1.

  On the other hand, the second colored layer 292 has an optical characteristic of absorbing the first blue light BL1 and transmitting the second blue light BL2. Therefore, as shown in FIG. 9, the light emitted to the outside through the second colored layer 292 becomes the second blue light BL2.

  Similarly, in the image forming unit 9 of the present embodiment, the first green light and the second green light are formed corresponding to the sub-pixels emitting green light (corresponding to the sub-pixels G1 and G2 shown in FIG. 2). A colored layer is provided, and a colored layer for forming the first red light and the second red light is provided corresponding to the sub-pixels emitting red light (corresponding to the sub-pixels R1 and R2 shown in FIG. 2). .

  10 to 13 are graphs showing the characteristics of each component in the image forming unit 9 of the second embodiment.

  FIG. 10 is a graph illustrating an emission spectrum of colored light emitted from the organic EL element of each sub-pixel, where FIG. 10A is blue light, FIG. 10B is green light, and FIG. Shown for red light. As shown in the figure, color light having a wavelength distribution having one peak is emitted before entering the colored layer.

  11 to 13 are graphs showing the optical characteristics of the colored layer and the emission spectrum of the colored light emitted through the colored layer. FIG. 11 shows blue light, FIG. 12 shows green light, and FIG. 13 shows red light. In each figure, (a) shows the optics of the colored layer provided corresponding to the sub-pixel emitting the first light. (B) is an optical characteristic of the colored layer provided corresponding to the sub-pixel that emits the second light, and (c) is each color when the colored light shown in FIG. 10 is emitted through the colored layer. The emission spectrum of light is shown.

  As shown in the figure, the colored light shown in FIG. 10 is converted into first light and second light having different peak wavelengths through the colored layer and emitted from the image forming unit.

  In this manner, the first light (first blue light BL1, first green light GL1, first red light RL1) and second light (second blue light BL2, second green light) emitted from the image forming unit. The light GL2 and the second red light RL2) are separated by the wavelength separation element 4 (see FIG. 1).

  FIG. 14 is a graph showing an example of an emission spectrum of colored light separated through the dichroic mirror 8 of the wavelength separation element 4, and is a graph corresponding to FIG.

  The head mounted display 1 displays the right eye image using the first light (first blue light BL1, first green light GL1, first red light RL1) that can be separated as described above. The left-eye image can be displayed using two lights (second blue light BL2, second green light GL2, and second red light RL2).

  Even with the head-mounted display configured as described above, the left-eye image and the right-eye image formed by the same image forming unit 9 can be separately observed with the left eye and the right eye, respectively. Therefore, the apparatus can be reduced in size and weight as compared with the configuration in which the image forming unit for the left eye and the image forming unit for the right eye are separately provided.

  Moreover, in the head mounted display of this embodiment, since it is supposed that 1st light and 2nd light are formed through a color filter layer (colored layer), it can be set as a high-intensity image formation part. it can. Therefore, reduction in power consumption of the apparatus and improvement in image quality can be realized.

  In the present embodiment, in the organic EL element of the image forming unit, first, colored light having a wavelength distribution having one peak is formed, and then separated into first light and second light using a color filter layer. However, before entering the color filter layer, after dividing into the first light and the second light using the optical resonance structure in the same manner as in the first embodiment, the color filter layer is further separated. It doesn't matter if you use it. As described above, the plurality of configurations that form the first light and the second light cooperate to display an image with high color purity and suppressed crosstalk.

  In the present embodiment, the color filter layer is provided. In addition, the wavelength separation film has a characteristic of transmitting either one of the first light and the second light and reflecting the other. May be provided in each sub-pixel. As such a wavelength separation film, a so-called dichroic mirror formed using a dielectric multilayer film can be used.

  In the present embodiment, the image forming unit 9 is described as being a top emission type organic EL device. However, the image forming unit 9 may be a bottom emission type organic EL device.

  In the present embodiment, the image forming unit 9 has an optical resonator structure. However, the image forming unit 9 does not have an optical resonator structure, and the first layer and the second beam are formed by the colored layer. It doesn't matter.

[Third Embodiment]
Next, a third embodiment will be described. In the present embodiment, the same color sub-pixels (sub-pixel B1 and sub-pixel B2, sub-pixel G1 and sub-pixel G2, sub-pixel R1 and sub-pixel R2) included in the pixel shown in FIG. A circuit configuration for driving one set of sub-pixels (sub-pixel set) is described.

  FIG. 15 is a circuit diagram illustrating a configuration of sub-pixels of the image forming unit in the present embodiment. In this embodiment, the subpixel group for each color has a configuration in which transistors and wirings for switching signals to each subpixel are shared. Here, the configuration of the sub-pixel set will be described by taking the red sub-pixel set (sub-pixel R1 and sub-pixel R2) as an example.

  The image forming unit illustrated in FIG. 15 includes a plurality of scanning lines 30 extending in the X direction and parallel to each other, and a plurality of data lines 31 extending across the scanning lines 30. Each region surrounded by the scanning line 30 and the data line 31 is a region corresponding to one subpixel set. The image forming unit includes a first power supply line 32, a second power supply line 33, and a third power supply line 34 provided for each row of the sub-pixel groups arranged in the X direction. The first to third power supply lines are provided in parallel with the scanning line 30, for example.

  The red sub-pixel group (sub-pixel R1 and sub-pixel R2) includes a selection transistor 35, a drive transistor 36, a first organic EL element 37, a second organic EL element 38, and a capacitor 39. The light emitted from the first organic EL element 37 is emitted from the sub-pixel R1. The light emitted from the second organic EL element 38 is emitted from the sub-pixel R2.

  The first organic EL element 37 is configured with the common electrode 40 as an anode and the first counter electrode 41 as a cathode. The second organic EL element 38 is configured with the common electrode 40 as an anode and the second counter electrode 42 as a cathode. In the first organic EL element 37 and the second organic EL element 38, when a voltage equal to or higher than a threshold (hereinafter referred to as a light emission threshold) is applied between the anode and the cathode, the organic light emitting layer is directed in the direction from the anode to the cathode. A current flows and emits light having a light amount corresponding to the value of the current. The first organic EL element 37 and the second organic EL element 38 may be configured with the common electrode 40 as a cathode and the first counter electrode 41 and the second counter electrode 42 as an anode.

  The gate of the selection transistor 35 is electrically connected to the scanning line 30. One of the source and drain of the selection transistor 35 is electrically connected to the data line 31, and the other of the source and drain of the selection transistor 35 is electrically connected to the gate of the driving transistor 36. When the selection transistor 35 is in an off state, it is substantially impossible to apply a voltage to the gate of the driving transistor 36 via the data line 31. When a selection signal is supplied to the scanning line 30 and the selection transistor 35 is turned on, a voltage can be applied to the gate of the driving transistor 36 via the data line 31.

  One of the source and drain of the driving transistor 36 is electrically connected to the first power supply line 32. The other of the source and drain of the drive transistor 36 is electrically connected to the common electrode 40, that is, one of the first organic EL element 37 and the second organic EL element 38. The first counter electrode 41 which is the other electrode of the first organic EL element 37 is electrically connected to the second power supply line 33. The second counter electrode 42, which is the other electrode of the first organic EL element 37, is electrically connected to the third power supply line 34.

  One electrode of the capacitor 39 is electrically connected to the gate of the selection transistor 35. The other electrode of the capacitor 39 is electrically connected to the first power supply line 32. The capacitor 39 is charged when a signal (voltage) is applied to the gate of the driving transistor 36 via the data line 31 and the selection transistor 35, and this signal can be held for a predetermined period.

  When a voltage is applied to the gate of the driving transistor 36 via the data line 31 and the selection transistor 35, a first potential is applied to the common electrode 40 via the first power supply line 32. A second potential or a third potential is applied to the first counter electrode 41 via the second power supply line 33. The second potential is lower than the first potential, and the difference from the first potential is set to be equal to or greater than the light emission threshold. The third potential is lower than the first potential and higher than the second potential, and the difference from the first battery is set to be less than the light emission threshold. That is, when the first potential is applied to the common electrode 40 and the second potential is applied to the first counter electrode 41, the first organic EL element 37 can emit light, and the first counter electrode 41 When the third battery is applied, the first organic EL element 37 cannot emit light.

  During the period in which the second potential is applied to the first counter electrode 41 and the first organic EL element 37 can emit light, the third potential is applied to the second counter electrode 42 via the third power supply line 34. 2 The organic EL element 38 becomes unable to emit light. The second potential is applied to the second counter electrode 42 via the third power supply line 34 during a period in which the third potential is applied to the first counter electrode 41 and the first organic EL element 37 cannot emit light. The second organic EL element 38 can emit light.

  The head-mounted display configured as described above allows the left-eye image and the right-eye image formed by the same image forming unit to be observed separately by the left eye and the right eye, respectively, thereby reducing the size and weight of the device. Can be realized.

  In addition, since the period during which the first organic EL element 37 can emit light and the period during which the second organic EL element can emit light do not overlap, the first light L1 indicating the right-eye image and the second light L2 indicating the left-eye image. Are alternatively ejected from the image forming section in time sequence. Therefore, even when the wavelength separation function of the wavelength separation element 4 is not perfect, it is suppressed that the right-eye image and the left-eye image are mixed and observed.

  Further, since the selection transistor 35 and the drive transistor 36 are shared by the first organic EL element 37 and the second organic EL element 38, it is possible to avoid the configuration of the image forming unit from becoming complicated.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Head mounted display (head mounted display apparatus), 2, 9 ... Image formation part (display apparatus), 4 ... Wavelength separation element (wavelength separation optical system), 5 ... Light guide part, 21 ... Pixel electrode (pair) Electrode, reflecting surface), 22 ... cathode (a pair of electrodes, semi-transmissive / semi-reflecting surface), 23 ... light emitting part (light emitting layer), 291 ... first colored layer, 292 ... second colored layer, B1 ... subpixel ( First sub-light-emitting element, first light-emitting element), G1... Sub-pixel (first sub-light-emitting element, second light-emitting element), R1... Sub-pixel (first sub-light-emitting element, third light-emitting element), B2 ... sub-pixel (second sub-light-emitting element, first light-emitting element), G2 ... sub-pixel (second sub-light-emitting element, second light-emitting element), R2 ... sub-pixel (second sub-light-emitting element, third light-emitting element) Element), L1 ... first light, L2 ... second light,

Claims (16)

A display device that has a plurality of light emitting elements and emits first light that shows a right-eye image and second light that has the same color as the first light, has a different peak wavelength, and shows a left-eye image When,
A wavelength separation optical system that transmits one of the first light and the second light and reflects the other; and
A light guide that guides the first light through the wavelength separation optical system to the right eye of the observer and guides the second light through the wavelength separation optical system to the left eye of the observer. Part-mounted display device. The light-emitting element includes a first sub-light-emitting element that emits the first light, and a second sub-light-emitting element that emits the second light,
The first sub-light-emitting element and the second sub-light-emitting element are provided on a light-emitting layer sandwiched between a pair of electrodes, a reflective surface provided on one side of the pair of electrodes, and the other side, respectively. An optical resonator is formed between the reflective surface and the semi-transmissive semi-reflective surface,
The head-mounted display device according to claim 1, wherein the first sub light emitting element is set to have a resonance length different from that of the second sub light emitting element. A resonance length of the first sub-light-emitting element is set to a center wavelength of the first light;
The head-mounted display device according to claim 2, wherein a resonance length of the second sub-light-emitting element is set to a center wavelength of the second light. The light emitting element is provided opposite to the first sub light emitting element in the light extraction direction, and absorbs a part of the light and transmits the first light; and
The second colored layer provided opposite to the second sub-light-emitting element in the light extraction direction and absorbing part of the light and transmitting the second light. The head-mounted display device according to any one of the above. The light-emitting element is provided opposite to the first sub-light-emitting element in a light extraction direction, and reflects a part of the light and transmits the first light;
4. A second wavelength separation film provided opposite to the second sub-light-emitting element in a light extraction direction and reflecting a part of the light and transmitting the second light. 5. The head-mounted display device according to any one of the above.   6. The light emitting device according to claim 1, wherein the plurality of light emitting devices include a first light emitting device that emits blue light, a second light emitting device that emits green light, and a third light emitting device that emits red light. The head-mounted display device according to item 1. The peak wavelength of the first light related to the blue light is longer than the peak wavelength of the second light related to the blue light,
The peak wavelength of the first light related to the green light is shorter than the peak wavelength of the second light related to the green light,
The wavelength separation optical system transmits light having a continuous peak wavelength including a peak wavelength of the first light related to the blue light and a peak wavelength of the first light related to the green light. Item 7. The head-mounted display device according to Item 6. The peak wavelength of the second light related to the green light is longer than the peak wavelength of the first light related to the green light,
The peak wavelength of the second light related to the red light is shorter than the peak wavelength of the first light related to the red light,
The wavelength separation optical system reflects light having a continuous peak wavelength including a peak wavelength of the second light related to the green light and a peak wavelength of the second light related to the red light. Item 8. The head-mounted display device according to Item 6 or 7. The peak wavelength of the second light related to the blue light is longer than the peak wavelength of the first light related to the blue light,
The peak wavelength of the second light related to the green light is shorter than the peak wavelength of the first light related to the green light,
The wavelength separation optical system reflects light having a continuous peak wavelength including a peak wavelength of the second light related to the blue light and a peak wavelength of the second light related to the green light. Item 7. The head-mounted display device according to Item 6. The peak wavelength of the first light related to the green light is longer than the peak wavelength of the second light related to the green light,
The peak wavelength of the first light related to the red light is shorter than the peak wavelength of the second light related to the red light,
The wavelength separation optical system transmits light having a continuous peak wavelength including a peak wavelength of the first light related to the green light and a peak wavelength of the first light related to the red light. Item 8. The head-mounted display device according to Item 6 or 7. A plurality of light-emitting elements each including an anode, a cathode facing the anode, and a light-emitting layer sandwiched between the anode and the cathode;
The light-emitting element includes: a first sub-light-emitting element that emits first light; and a second sub-light-emitting element that emits second light having the same color and different peak wavelength as the first light. Display device. The light emitting element has an optical resonator structure formed between a reflective surface provided on the anode side and a transflective surface provided on the cathode side,
The display device according to claim 11, wherein the first sub-light-emitting element has a resonance length different from that of the second sub-light-emitting element. A resonance length of the first sub-light-emitting element is set to a center wavelength of the first light;
The display device according to claim 12, wherein a resonance length of the second sub-light-emitting element is set to a center wavelength of the second light. The light-emitting element is provided opposite to the first sub-light-emitting element in the light extraction direction, and a first colored layer that absorbs a part of the light and transmits the first light;
The second colored layer provided opposite to the second sub-light-emitting element in the light extraction direction and absorbing part of the light and transmitting the second light. The display device according to any one of the above. The light-emitting element is provided opposite to the first sub-light-emitting element in a light extraction direction, and reflects a part of the light and transmits the first light;
14. A second wavelength separation film provided opposite to the second sub-light-emitting element in a light extraction direction and reflecting a part of the light and transmitting the second light. The display device according to any one of the above.   The plurality of light-emitting elements include a first light-emitting element that emits blue light, a second light-emitting element that emits green light, and a third light-emitting element that emits red light. Item 1. A display device according to item 1.

Images