JP2016126072A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that allows an observer to see the back side of a display device through the display panel.SOLUTION: A display device comprises: a display panel 2; a collimated light 4 that is arranged while avoiding an area facing the back side of the display panel 2 and emits beams of light 10 while optically adjusting the directions of the beams to be parallel to each other; and a light path conversion component 3 that is arranged in an area immediately below the back face of the display panel 2 and converts a light path of the entered light 10. The light 10 enters obliquely the light path conversion component 3, has its light path converted, and advances toward the back face of the display panel 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device.

  A stereoscopic display device such as a liquid crystal display emits light of different images to both eyes of an observer to realize stereoscopic display using binocular parallax. Here, light having directivity toward both eyes of the observer is irradiated from each pixel of the stereoscopic display device.

  In the following cited document 1, a light guide plate for diffusing light emitted from a light source to form a substantially uniform issue surface, a parallax barrier for entering different images into the left and right eyes of an observer, or a liquid crystal lens Is provided. Further, in Patent Document 2 below, a cylindrical lens and a shift lenticular array are provided for guiding light rays into a region including a plurality of viewpoints arranged in the horizontal direction.

JP 2012-108316 A JP 2004-0487702 A

  In a display device such as the above-described stereoscopic display device, an irradiating component that irradiates light to the display panel is disposed in a region immediately below the back surface of the opaque display panel. In this case, even if the display panel is formed so as to transmit light, light from behind the stereoscopic display device is blocked by the opaque irradiation component. For this reason, the observer cannot see the back side of the stereoscopic display device from a position facing the surface of the display panel.

  An object of the present invention is to provide a display device capable of seeing the back side through a display panel.

  The display device according to the present invention includes a display panel, a collimate light that is arranged so as to avoid a region facing the back surface of the display panel, and optically adjusts and emits light so that directions of light beams are parallel, and the display panel And an optical path conversion component that converts an optical path of the incident light, and the light is obliquely incident on the optical path conversion component, the optical path is converted, and the display Proceed toward the back of the panel. According to this, it is possible to change the optical path and irradiate light, and to see the back side through the display panel.

It is the perspective view which showed the inside of the display apparatus which concerns on one Embodiment of this invention. It is the front view which showed an example of the internal layout of a display apparatus. It is a front view which shows an example of the layout of the pixel in a display panel. FIG. 5 is a perspective view showing an example of a first region in the optical path conversion component. It is sectional drawing which shows an example of the inside of an optical path conversion component. It is sectional drawing which showed an example of the inside of a collimate light. It is sectional drawing which shows an example of the inside of the optical path conversion component which concerns on a modification. It is sectional drawing which shows an example of the inside of the collimate light which concerns on a modification.

  Below, the form (henceforth an embodiment) for carrying out the present invention is explained. It should be noted that the disclosure of this specification is merely an example of the present invention, and appropriate modifications that maintain the gist of the present invention and that can be easily conceived by those skilled in the art are included in the scope of the present invention. Moreover, the width | variety of each part shown in a figure, thickness, a shape, etc. are represented typically and do not limit the interpretation of this invention.

[1. Configuration of display device]
FIG. 1 is a perspective view showing the inside of a display device 1 according to an embodiment of the present invention. The display device 1 includes a display panel 2, an optical path conversion component 3, and a collimate light 4. As shown in FIG. 1, the display panel 2 is disposed on the front surface of the display device 1, and the optical path conversion component 3 is disposed in a region immediately below the back surface of the display panel 2. The collimate light 4 avoids the area facing the back surface of the display panel 2 and is arranged at a position separated in the vertical direction or horizontal direction of this area.

  Here, the light 10 that has been optically adjusted by the collimator light 4 so as to be parallel to the direction of the light beam is incident obliquely on the optical path conversion component 3, and the optical path is converted by the optical path conversion component 3 to display Proceed toward the back of the panel 2. The light 10 that has reached the display panel 2 is emitted from the surface of the display panel 2 with the light transmittance controlled for each color in the display panel 2. Here, the light 10 that has entered the optical path conversion component 3 has its optical path converted in a different direction depending on the position of the optical path conversion component 3, and is emitted from the surface of the display panel 2.

  Further, a portion corresponding to the back surface of the case of the display device 1 is cut out or transparent, and light 11 from the outside is incident on the back surface of the optical path conversion component 3. The light 11 incident on the optical path conversion component 3 passes through the display panel 2 without being converted in the optical path, and is also emitted from the surface of the display panel 2.

  FIG. 2 is a front view showing an example of the internal layout of the display device 1. As shown in FIG. 2, the observer can simultaneously view the formed image 50 formed by the light 10 from the collimate light 4 and the background image 51 formed by the external light 11 on the display panel 2. it can. Here, the background image 51 is a real image representing a state behind the display device 1 or a scenery.

[2. Display panel]
FIG. 3 is a front view illustrating an example of a pixel layout in the display panel 2. As shown in FIG. 3, a display area, which is an area for displaying an image, is provided on the surface of the display panel 2, and a plurality of pixels 21 are provided in the display area. The pixels 21 are arranged in the horizontal direction and the vertical direction of the display area.

  Here, each pixel 21 includes a plurality of divided pixels 22. The display panel 2 displays the formed image 50 in the display area by controlling the light transmittance of the divided pixels 22 for each color according to the image information input to the display device 1, and at the same time, the observer The image 51 can be seen through. In the present embodiment, as illustrated in FIG. 3, one pixel 21 includes nine divided pixels 22.

  The divided pixels 22 have a plurality of color dots D for color display, each of which transmits light in different colors. More specifically, the divided pixel 22 includes red dots D (R) that transmit light in red, green dots D (G) that transmit light in green, and blue dots D (B) that transmit light in blue. Have. In addition, the divided pixels 22 may have white dots D (W) that are white and transmit light.

  In the present embodiment, each dot D includes a liquid crystal material. That is, the display panel 2 is a liquid crystal panel. The display panel 2 adjusts the amount of light transmitted through each dot D to emit light having different hue, saturation, and brightness for each divided pixel 22 and displays the formed image 50 in the display area. It becomes possible.

  When the display device 1 uses a display device that controls the amount of transmitted light by controlling the polarization state using liquid crystal, the light incident on the liquid crystal layer in the dot D is polarized in advance. Cost. For this reason, in this embodiment, a polarizing plate that polarizes light is disposed between the collimate light 4 and the display panel 2. The polarizing plate may be disposed, for example, in a region directly under the back surface of the display panel 2, a surface or back surface of the optical path conversion component 3, or a region directly under the light exit surface 42 </ b> B of the collimate light 4. Here, the polarizing plate is a linear polarizing plate. Further, another polarizing plate is also arranged on the front side of the display panel 2. The other polarizing plate is a linear polarizing plate, and has a polarizing property perpendicular to the polarizing property of the polarizing plate provided between the collimate light 4 and the display panel 2.

[3. Optical path conversion component]
The optical path conversion component 3 is disposed in a region immediately below the back surface of the display panel 2, converts the optical path of the incident light 10, and emits the light toward the display panel 2. In addition, the optical path conversion component 3 includes a plurality of first regions 31 (see FIG. 4) that respectively correspond to the plurality of pixels 21 included in the display region. The first area 31 is constituted by a plurality of second areas 32 respectively corresponding to the plurality of divided pixels 22 constituting the pixel 21 corresponding thereto.

  FIG. 4 is a perspective view illustrating an example of the first region 31 in the optical path conversion component 3. In the present embodiment, since one pixel 21 includes nine divided pixels 22, the first region 31 includes nine second regions 32 that respectively correspond to the nine divided regions. The plurality of first regions 31 are arranged in the horizontal direction and the vertical direction of the optical path conversion component 3.

  Here, the optical path of the light 10 incident on the first region 31 is converted so that the emission direction differs for each second region 32. The light 10 emitted from one second region 32 enters one divided pixel 22 corresponding to the second region 32. In the present embodiment, among the nine second regions 32 included in one first region 31, the central second region 32 changes the optical path of the light 10 so as to travel in the front direction with respect to the optical path conversion component 3. In addition, the second region 32 on the upper right side converts the optical path of the light 10 so as to travel in the upper right direction, and emits the light toward the corresponding divided pixel 22.

  In addition to including the conversion unit 33 that converts the optical path of light in this way, the optical path conversion component 3 includes a transmission unit 34 that allows light transmission while remaining in the optical path when incident. Hereinafter, each of the conversion unit 33 and the transmission unit 34 will be described with reference to FIG.

  FIG. 5 is a cross-sectional view showing an example of the inside of the optical path conversion component 3 according to the present embodiment, and the cut surface is indicated by the line VV in FIG. FIG. 5 shows an example in which the conversion unit 33 of the optical path conversion component 3 includes a micromirror. The light 10 from the collimate light 4 that is incident obliquely on the conversion unit 33 of the optical path conversion component 3 is reflected by the micromirror, thereby changing the direction of the optical path. Further, the external light 11 incident on the transmission part 34 of the optical path conversion component 3 travels toward the surface of the optical path conversion component 3 without being blocked by the micromirror. The angle of the micromirror is adjusted so that the optical path is converted in a predetermined direction according to each second region 32.

[4. Collimated light]
FIG. 6 is a cross-sectional view showing an example of the interior of the collimate light 4. The collimate light 4 includes a light source 41 that emits light, and a collimator 42 that optically adjusts the direction of the light beam emitted by the light source 41 to be parallel.

  The light source 41 includes a light emitting element such as an LED (light emitting diode), an OLED (Organic Light-Emitting Diode), or a QLED (quantum-dot light emitting diode). When an OLED or QLED is used as the light source 41, unlike a point light source LED, a continuous planar light source can be formed, so that more uniform light can be emitted. In addition, since the half-width of the emission spectrum of the QLED is narrower than that of the conventional LED, when the QLED is used as the light source 41, it is possible to emit light with higher saturation.

  The collimator 42 is made of, for example, a transparent resin material such as acrylic or polycarbonate. The collimator 42 is formed in a tapered shape so that the distance between the two side surfaces 42S facing each other increases as the distance from the light source 41 increases. By forming the collimator 42 in this way, when the light incident from the light source 41 is reflected by the side surface 42S of the collimator 42, its traveling direction is aligned with the emission direction, and from the light emission surface 42B of the collimator 42, The light 10 in which the directions of the light beams are aligned in the parallel direction is emitted. The light 10 thus emitted is suitable for a display device that emits image light in a specific direction because the light distribution is uniform and the directivity of the light is strong.

[5. Summary of Embodiment]
As described above, in the display device 1 according to the present embodiment, the collimate light 4 is disposed avoiding the region directly below the back surface of the display panel 2 and the optical path conversion component 3. The light path of the light 10 is converted and emitted, and the transmission of the light 11 from the back surface is allowed.

  The display panel 2 according to the present embodiment includes red dots D (R), green dots D (G), blue dots D (B) (and white dots D (W)) for each divided pixel 22. By adjusting the light transmittance, display control is performed so that light of different images is emitted according to the direction in which the light 10 travels. In one example, the divided pixel 22 that emits the light 10 in a certain direction emits light that forms an image of the object when viewed from the direction. More specifically, among the nine divided pixels 22 constituting one pixel 21, the central divided pixel 22 emits light constituting an image when the object is viewed from the front, The divided pixels 22 emit light constituting an image when the object is viewed from the upper right. By doing in this way, the display apparatus 1 can make the observer who looked at the display panel 2 from the said direction visually recognize the image showing the target object seen from a predetermined direction. That is, the display device 1 according to the present embodiment enables pseudo three-dimensional (stereoscopic) display.

  In addition, for example, the optical path conversion component 3 changes the direction of the optical path so that the light 10 is incident on each of the observer's right eye and left eye, and the display panel 2 is formed by the light 10 incident on the right eye. Display control may be performed so that the formed image 50 and the formed image 50 formed by the light 10 incident on the left eye are different from each other. By doing so, different images are projected on the right and left eyes of the observer, and thus the display device 1 can perform stereoscopic display using binocular parallax.

  In addition, for example, the display panel 2 may emit light having the same hue, saturation, and brightness at each of the plurality of divided pixels 22 constituting one pixel 21. That is, the display device 1 may output light of the same image in each direction.

  In this case, the display device 1 receives and accepts selection of whether to emit light of different images or light of the same image in each of the plurality of divided pixels 22 constituting one pixel 21. You may make it switch a display state according to selection.

  In addition, for example, the display panel 2 reduces the light transmittance of the divided pixel 22 corresponding to the second region 32 of the optical path conversion component 3 that converts the optical path in the specific direction. The amount of light emitted in the direction may be limited.

[6. Modified example]
The present invention is not limited to the embodiment described above, and various changes may be made. Hereinafter, an example (modification) of another embodiment for carrying out the present invention will be described.

  (1) In the embodiment, the case where each dot D included in the display panel 2 is configured to include a liquid crystal material (that is, the display panel 2 is a liquid crystal panel) has been described. Each dot included in the display panel may include a shutter mechanism of MEMS (Micro Electro Mechanical Systems). The display panel in this case adjusts the amount of light emitted from each dot by moving the shutter and transmitting or blocking light within a minute time, and displays an image in the display area. As described above, when the MEMS shutter mechanism is used, the display device may not include the polarizing plate.

  (2) In the embodiment, the case where the conversion unit 33 that converts the optical path of light in the optical path conversion component 3 is configured to include a micromirror. However, the conversion unit is not limited to this, and the optical path of light You may comprise including the member to convert.

  FIG. 7 is a cross-sectional view showing an example of the inside of the optical path conversion component 300 according to this modification. FIG. 7 shows an example in which the conversion unit 330 is configured to include a microprism. The light 10 incident obliquely on the conversion unit 330 of the optical path conversion component 300 is reflected by the side surface of the microprism, and the direction of the optical path is converted. In the optical path conversion component 300, the light 11 incident on the transmission unit 340 does not contact the microprism and passes through the optical path conversion component 300 without being converted. Here, the size and shape of the microprism are designed so that the optical path is converted in a predetermined direction.

  (3) In the embodiment, the case where each dot D included in the display panel 2 includes a liquid crystal material and a polarizing plate is provided between the collimate light 4 and the display panel 2 has been described. , The polarizing plate disposed between the collimate light 4 and the display panel 2 can be omitted.

  FIG. 8 is a cross-sectional view showing an example of the interior of the collimate light 400 that emits polarized light. The collimated light 400 here includes a light source 410, a polarization splitter 430, a prism 440, and a half-wave plate 450. The light emitted from the light source 410 is separated into two polarized light beams whose polarization planes are orthogonal by the polarization splitter 430. Of the two separated polarizations, one polarization passes through the polarization splitter 430 and is emitted as it is, and the other polarization is reflected by the polarization splitter 430. The polarized light reflected by the polarization splitter 430 is further reflected by the prism 440 and passes through the half-wave plate 450. The polarized light that passes through the half-wave plate 450 is emitted in the same polarization state as the polarized light that has passed through the polarization splitter 430. This polarization state is linearly polarized light. When such a collimate light 400 is installed in the display device, it is not necessary to install a polarizing plate between the display panel containing the liquid crystal material and the collimate light 400. For this reason, when an observer sees the back of the display panel 2 through, there exists an effect that it becomes easier to see. That is, according to the display device 1 according to the present modification, it is possible to show the back side of the display panel with higher transmittance.

  DESCRIPTION OF SYMBOLS 1 Display apparatus, 2 Display panel, 3 Optical path conversion component, 4 Collimated light, 10 Light from collimated light, 11 Light from the outside, 21 pixels, 22 division | segmentation pixels, D dot, 31 1st area | region, 32 2nd area | region, 33 conversion unit, 34 transmission unit, 41 light source, 42 collimator, 42S collimator side surface, 42B collimator light exit surface, 50 formed image, 51 background image, 300 optical path conversion component, 330 conversion unit, 340 transmission unit, 400 collimated light , 410 light source, 420 collimator, 430 polarization splitter, 440 prism, 450 half-wave plate.

Claims (8)

A display panel;
Collimated light that is arranged avoiding the area facing the back surface of the display panel and optically adjusts and emits light so that the direction of the light flux is parallel, and
An optical path conversion component that is disposed in a region directly under the back surface of the display panel and converts the optical path of the incident light;
Have
The light is incident obliquely on the optical path conversion component, the optical path is converted, and travels toward the back surface of the display panel. The display device according to claim 1,
The display panel includes a plurality of pixels, and each of the pixels includes a plurality of divided pixels.
The optical path conversion component has a plurality of first regions corresponding to the plurality of pixels, respectively, and the first region corresponds to the plurality of divided pixels constituting the pixel corresponding to the first region. Configured by a plurality of second regions,
The optical path of the light incident on the first region is converted so that the emission direction is different for each of the second regions in each of the first regions,
The light emitted from the second region is incident on the divided pixels corresponding to the second region. The display device according to claim 2,
Each of the divided pixels is composed of a plurality of color dots for color display. The display device according to claim 1,
The optical path conversion component includes a transmission unit that allows transmission of light while maintaining an optical path when incident, and a conversion unit that converts the optical path of light. The display device according to claim 1,
The collimator light includes a light source, and a collimator that optically adjusts so that directions of light beams emitted from the light source are parallel to each other. The display device according to claim 1,
A first polarizing plate is disposed between the optical path conversion component and the collimate light,
A second polarizing plate is disposed on the surface of the display panel opposite to the surface on which the optical path conversion component is disposed;
The display device is a liquid crystal panel. The display device according to claim 1,
A polarizing plate is not disposed between the optical path conversion component and the collimate light,
A polarizing plate is disposed on the surface opposite to the surface on which the optical path conversion component of the display panel is disposed,
The display device, wherein the light from the collimate light is linearly polarized. A display panel;
Collimated light that is arranged avoiding the area facing the back surface of the display panel and optically adjusts and emits light so that the direction of the light flux is parallel, and
An optical path conversion component that is disposed in a region directly under the back surface of the display panel and converts the optical path of the incident light;
Have
The optical path conversion component converts the optical path of the incident light and travels toward the back surface of the display panel.

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