JP5263751B2 - Single screen display device - Google Patents

Description

  The present invention relates to an illumination device such as a backlight for a liquid crystal display, and a thin display device having a viewing angle control function, a two-dimensional display / three-dimensional display switching function, and the like.

  In general, a display with a wider viewing angle is easier to see. However, in a display such as a mobile phone or a notebook PC, the viewing angle may be narrowed to prevent others from peeping. Therefore, it is desirable to have a function of switching the viewing angle according to the usage scene (hereinafter also referred to as “viewing angle control function”). Therefore, conventionally, a method of electrically switching the viewing angle of the liquid crystal display has been proposed. For example, Patent Document 1 below discloses a display device having a configuration in which an electric field control panel 3 is inserted between a liquid crystal display panel 1 and a backlight 2 as shown in FIG. Here, the electric field control panel 3 has a configuration in which a polymer-dispersed liquid crystal layer is disposed between two transparent substrates provided with a transparent electrode, and becomes transparent when a voltage is applied between the transparent electrodes. At this time, the light irradiated from the backlight 2 enters the liquid crystal display panel 1 without being scattered, and the viewing angle is in a narrow range in the front direction. On the other hand, when no voltage is applied to the electric field control panel 3, the polymer dispersed liquid crystal layer scatters the light from the backlight 2, so that light is emitted from the liquid crystal display panel 1 in a wide range, and the viewing angle is wide. Become.

  On the other hand, a liquid crystal display having a function of switching between stereoscopic display and planar image display by a binocular binocular parallax method (hereinafter also referred to as “stereo / planar display switching function”) is known. For example, a method using a backlight having two light sources is disclosed in Non-Patent Document 1 below. In Non-Patent Document 1, as shown in FIG. 11, light sources 1 and 2 are arranged at both ends of a light guide plate of an edge lighting type backlight, and these are alternately lit. A special optical component (the cross-sectional shape is a lenticular lens on the upper surface and a prism on the lower surface) is disposed on the surface of the light guide. For example, when the light source 1 is turned on, light is emitted in a direction inclined about 10 ° to the right from the normal line of the LCD by the function of this optical component. Thus, the light reaches the right eye but does not reach the left eye. When the light source 2 is turned on, light is emitted in a direction inclined about 10 ° to the left side, and is incident only on the left eye. When the right and left eye image data is input to the liquid crystal panel in synchronization with the ON / OFF of these two sets of light sources 1 and 2, only the right eye image is incident on the right eye and only the left eye image is input to the left eye. Will be incident. By switching this operation at high speed, stereoscopic display becomes possible. If both light sources 1 and 2 are turned on simultaneously in this configuration, a planar image is displayed. The definition of the planar image is the same as that of the stereoscopic display.

  The following Patent Document 2 is also known. In Patent Document 2, as shown in FIG. 12, two lenticular lenses 31 and 32 are placed on the surface of the liquid crystal display 2 so as to face each other. One curved surface 31 a of the lenticular lens corresponds to two adjacent pixels 41 and 42 of the liquid crystal display 2. In the stereoscopic image display mode of FIG. 12A, the light that has passed through the pixel 41 is bent in the right direction from the normal line of the display surface due to the effect of the lens. Similarly, the light passing through the pixel 41 is bent in the left direction. Therefore, by displaying an image for the right eye on the pixel 41 and an image for the left eye on the pixel 42, stereoscopic display by the binocular parallax method is possible. On the other hand, in FIG. 12B, the two lenticular lenses 31 and 32 are arranged so as to face each other with a half pitch shift. In this case, the lens effect is canceled and a planar image is displayed. The planar image displayed here is twice as fine as the image in the stereoscopic image display mode. In other words, the definition of the stereoscopic display image is ½ of the definition of the flat display image.

  Moreover, the technique of FIG.11 and FIG.12 displays a different image (parallax image) according to two observation directions. Therefore, in addition to stereoscopic display, different images can be displayed for the driver and the passenger seat, for example, as a car navigation display. However, since the parallax in this case is equal to the angle formed by the two sides of the triangle whose vertex is the driver's eye, the passenger's eye, and the display, it is necessary to set the parallax larger than the parallax for stereoscopic display. is there.

As described above, a display device is required to have a function of switching between a wide viewing angle mode and a narrow mode, a function of switching between a stereoscopic image display mode and a planar image display mode, depending on the usage scene. A configuration for realizing each function has been proposed.
JP 2006-119291 A JP 2004-085924 A T. Sasagawa, A. Yuuki, S. Tahata, O. Murakami, and K. Oda, “Dual directional backlight for stereoscopic LCD,” SID03 Digest, pp. 399-401, 2003.

  If the viewing angle control function and the stereoscopic / planar display switching function can be realized with a single display device, the convenience of a mobile phone or the like is further improved. In addition, if the display for a map and the display of a three-dimensional landscape can be switched on the car navigation display, the effectiveness of the navigation system is improved.

  However, there are the following problems. 1stly, even if it combines the above-mentioned patent documents 1, 2 and nonpatent literature 1, it is difficult to implement | achieve the display apparatus which has both a viewing angle control function and a three-dimensional / planar display switching function.

  Secondly, there is a problem that the display device becomes larger with the addition of functions. In general, in order to make liquid crystal displays thinner, various technological innovations have been made, such as polishing of transparent substrates of liquid crystal panels, adoption of plastic materials, thinning of components such as polarizing plates and backlights, and integration of functions. At present, the thinnest liquid crystal display has a thickness of about 1 mm. If the viewing angle control function is installed according to the prior art, the thickness of the electric field control panel is added to the configuration of FIG. When the stereoscopic display mode switching function is installed, the thickness increases by 1 to 2 mm in the configuration of FIG. Therefore, in the prior art, it is difficult to thin a display device having these functions (not simultaneously but independently) to 1 mm or less.

  Thirdly, the binocular binocular parallax stereoscopic display has a problem that the range of places where stereoscopic images can be observed is narrow. To solve this, a multi-view method is known. That is, not only two images for the right eye and left eye, but also a number of images with slightly different viewing angles are output in slightly different directions, so that even if an observer moves from place to place, The observer can observe images corresponding to the respective positions at the same time. However, in the configuration of FIG. 11, the light emission direction is limited to two directions by the shape of a special optical component, so that the multi-view method cannot be applied. In the configuration using a lenticular lens as shown in FIG. 12, it is considered that a multi-lens system can be realized by associating many pixels with one lens. However, since it is necessary to display one stereoscopic image using a large number of pixels, there arises a problem that the definition of the image is remarkably deteriorated.

  Accordingly, an object of the present invention is to provide a thin display device and a thin illumination device capable of realizing a viewing angle control function, a stereoscopic / planar display switching function, and a multi-view stereoscopic display function. .

  The object of the present invention is achieved by the following means.

That is, the one-screen display device according to the present invention is disposed on the light emitting element, a plurality of predetermined number of light emitting elements formed on the substrate, a drive circuit for adjusting the light emission amount of each of the light emitting elements. The predetermined number of the light emitting elements and the optical means constitute one sub-pixel, and one sub-pixel and a plurality of sub-pixels adjacent to the periphery of the sub-pixel are unit pixels. Among the spectral intensity distributions of light emitted from a plurality of sub-pixels constituting the unit pixel, at least two spectral intensity distributions are different from each other, and the plurality of unit pixels are arranged two-dimensionally, The optical means guides light emitted from each of the light-emitting elements in the sub-pixel or the light-emitting element group that is a partial set of the light-emitting elements in the sub-pixel in different directions; The optical means is a lens In other words, at least three light emitting elements included in one sub-pixel are arranged at positions facing the curved surface of the lens, and the driving circuit turns on only the light emitting element located in the center in the first mode. In the second mode, the stereoscopic display is performed by turning on only the light emitting elements located on both sides. In the third mode, the wide field display is performed by turning on all the light emitting elements. It is characterized by performing.

  The light emitting device may be an organic EL light emitting device.

  The optical means can be any of a semi-cylindrical lens, a microlens, or a gradient index optical means.

  According to the present invention, a thin display device having both a viewing angle control function and a stereoscopic / planar display switching function can be realized. In the prior art, only one of the viewing angle control function and the stereoscopic / planar display switching function can be provided, and in any case, the thickness of the display device increases by 1 mm or more. Since display devices that do not have these functions are currently thinned to about 1 mm, the addition of these functions means that the thickness becomes twice or more.

  On the other hand, in the present invention, in order to provide these functions, the thickness of the display device is only increased by about 100 μm to 200 μm at most. When the present invention is applied to an organic EL display, the thickness of the display device can be reduced to 0.4 mm or less, and a marked reduction in thickness can be achieved as compared with a liquid crystal display having a similar function.

  Furthermore, according to the display device of the present invention, four display modes of wide / narrow viewing angle and stereoscopic / planar image can be switched with a single display device, so that various devices including video display devices can be switched. Added value can be increased. For example, the convenience of a mobile phone or the like can be further improved. When applied to a car navigation display, for example, it is possible to switch between a map display and a three-dimensional landscape display. In addition to the three-dimensional display, different images can be displayed for the driver and the passenger seat, so that the effectiveness of the car navigation system can be improved.

  Further, if the number of light-emitting elements constituting a sub-pixel is increased, a plurality of light-emitting elements are used as a light-emitting element group, and a parallax image for multi-view stereoscopic display is displayed on the light-emitting element group, the definition of the image is improved. High multi-view stereoscopic display can be easily realized.

  In addition, when the lighting device of the present invention is used as a backlight of a liquid crystal display, the thickness of the display device can be about 0.8 mm obtained by adding a 0.4 mm liquid crystal panel to a 0.4 mm backlight. is there.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a perspective view showing a configuration of a display device according to a first embodiment of the present invention. This display device is an example configured as an organic EL display. The display device includes a substrate 1 on which a plurality of organic light emitting diodes (hereinafter also referred to as OLEDs) and a driving circuit thereof are formed, and a semicylindrical lens array 2 disposed in close contact with the substrate 1. It is configured with.

  On the right side of FIG. 1, an enlarged configuration of a pixel serving as a unit element for image display is shown. The unit pixel 3 for color display has three sub-pixels 31 (R, G, and B in FIG. 1) that output red (R), green (G), and blue (B) light having different spectral intensity distributions. Is configured as a set. Each sub-pixel 31 is composed of three strip-shaped OLED # 1, OLED # 2 and OLED # 3, and one semi-cylindrical lens 21. OLED # 2 is disposed at the center, and OLED # 1 and # 3 are disposed around OLED # 2. ON / OFF of OLEDs # 1, # 2, and # 3 and the amount of light emission are controlled by a drive circuit provided independently for each OLED. In general, in a manufacturing process of an organic EL display, a part of a driving circuit called a pixel circuit is formed on the surface of a substrate 1 by thin film transistor (TFT) technology, and an insulating film or the like is formed thereon, and then OLED # 1 or the like. Is formed. These many pixel circuits are controlled by driving circuits (schematically indicated by reference numerals 4 and 4 ′ in FIG. 1) disposed in the peripheral portion of the substrate 1.

  In FIG. 1, an example of a configuration in which three subpixels 31 that output R, G, and B light are arranged in a stripe shape as the unit pixel 3 has been described. However, various methods are available for arranging a plurality of subpixels. It has been known. For example, a configuration in which two G subpixels and one R and B subpixels as a set are arranged in two rows and two columns may be used. Alternatively, there are methods of adding white subpixels to R, G, and B to improve luminance, or adding a fourth color subpixel to improve color reproducibility.

  Note that in order to display a monochrome image, only one type of OLED is used, and each unit pixel may be composed of one sub-pixel.

  FIG. 2 is a horizontal sectional view partially showing the display device shown in FIG. 1, and shows a positional relationship between one sub-pixel 31 and one main component. Three OLEDs # 1 to # 3 are arranged for one semicylindrical lens 21. In FIG. 2, the refractive index n of the lens material of the semicylindrical lens 21, the radius of curvature r of the semicylindrical lens 21, and the z of the center of the arc of the semicylindrical lens 21, which are important design parameters for this display device, are shown. A coordinate L and a distance H that is ½ of the pitch between the sub-pixels 31 (the width of the sub-pixels 31) are shown. Note that the point O is the origin of the xz coordinate.

  Here, the sub-pixel 31 is composed of three OLEDs. However, as will be described later, the number of OLEDs composing the sub-pixel 31 is not limited to three, and an appropriate number of OLEDs is selected according to the display specifications. Just decide. Further, the horizontal cross-sectional shape of the surface from which the light of the semi-cylindrical lens 21 is radiated is not limited to the circular arc that is a part of a perfect circle, and may be appropriately determined according to the required specification of the viewing angle control. The refractive index n of the lens material may be appropriately determined. In the following description, it is assumed that a general polymer material or glass material is used for the semicylindrical lens 21 and the refractive index n is about 1.5.

Next, the operation principle of the display device according to this embodiment will be described. In an OLED having a general element structure, light is emitted in all directions, and its angular distribution follows Lambert law. That is, the intensity I (θ) of light emitted in the direction of the angle θ formed with the normal direction of the light emitting unit (OLED) is expressed as I (θ) = I ₀ cos (θ), where I ₀ is a constant. The The light emitted from the OLED reaches the boundary between the lens and air and is refracted. Since total reflection may occur depending on the angle at which the light enters the boundary surface, it is desirable to design such that the probability of total reflection is low. As indicated by the solid line in FIG. 2, when only the OLED # 2 is lit, the emitted light can be changed in the z-axis direction by the refractive action of the lens. Therefore, the light is output in a narrow angle range centered on the front direction of the display. Further, as shown by the broken line in FIG. 2, when only OLED # 3 is turned on, the light is refracted on the lens surface, and mainly in the lower right direction of FIG. The path of light can be changed. Conversely, when only OLED # 1 is turned on, the light is refracted on the lens surface, and the light path is changed to the upper right, that is, from OLED # 1 to OLED # 2 (not shown).

  Therefore, in the display device according to the present embodiment, when the viewing angle is narrowed, only the OLED # 2 is lit, and when the viewing angle is widened, all the OLEDs # 1 to # 3 are lit. Good. In this way, by selecting the OLED to be lit and adjusting the amount of emitted light, it is possible to switch between a narrow viewing angle and a wide viewing angle. Further, in the display device according to the present embodiment, when performing binocular binocular parallax stereoscopic display, for example, only the OLED # 1 is turned on without turning on the OLED # 2, and the right-eye image is turned on. And only the OLED # 3 is lit to display the left-eye image. The timing for turning on the OLEDs # 1 and # 3 may be turned on at the same time, or alternatively may be turned on at high speed.

  As described above, in the display device according to the first embodiment of the present invention, the sub-pixel is composed of a plurality of OLEDs and lenses corresponding to them, and the sub-pixels are output by adjusting the emission intensity of each OLED. Control the intensity of light (angle distribution).

  Next, by giving numerical examples, it will be described in more detail that both the viewing angle control function and the stereoscopic / planar display switching function can be realized by the same configuration. Here, the refractive index n of the lens is 1.5, the radius r is 1.5, the z coordinate L is 1.7, and the distance H is 1.5. The sub-pixels are composed of five OLEDs # 1 to # 5. The positions of the OLEDs # 1 are -1.0 <x <-0.7, and the OLED # 1 uses the x coordinate of FIG. # 2 is −0.6 <x <−0.3, OLED # 3 is −0.2 <x <0.2, OLED # 4 is 0.3 <x <0.6, and OLED # 5 is 0. 7 <x <1.0. These values may be determined so as to satisfy the similar relationship. For example, when r = 60 (μm), the width of the OLED is 6 μm to 8 μm. At this time, the thickness of the display is increased by the thickness of the lens (128 μm).

  The output angle dependency of the light intensity can be obtained by numerical calculation using a ray tracing technique. That is, each OLED is set as a set of a large number of minute light sources, and light rays are generated from the respective light sources according to the Lambert law. The light emitted from the lens is traced by tracing the trajectory of each ray, determining whether or not it is totally reflected at the boundary between the lens and air, and if not totally reflected, applying the Snell's law to obtain the radiation angle. Find the direction. Finally, the frequency with which light rays are generated is added for each radiation angle.

  The result of simulating the angular distribution of the intensity of light emitted from the OLED by the ray tracing technique is shown in FIGS. FIG. 3 shows an angular distribution of the intensity of light emitted from each of the OLEDs # 1 to # 5. The number of rays generated by each OLED is the same.

  Based on the data in FIG. 3, in order to evaluate the viewing angle control function, a comparison was made between when only OLED # 3 was lit and when all OLEDs # 1 to # 5 were lit. The simulation results are shown in FIG. As shown in FIG. 4, when only the OLED # 3 located at the center of the sub-pixel is turned on, an angle distribution (half-value width is 20 °) centering on the front direction is obtained, and all the OLEDs # 1 to # 5 are obtained. When is turned on, a relatively wide angular distribution is obtained. The viewing angle was about ± 15 ° when only OLED # 3 was turned on, and about ± 35 ° when all OLED # 1 to # 5 were turned on.

  Next, in order to evaluate stereoscopic display by the binocular binocular parallax method, a case where OLEDs # 2 and # 4 are turned on was simulated. FIG. 5 shows the angle dependency of the obtained light intensity. From FIG. 5, it can be confirmed that the two angular distributions of OLEDs # 2 and # 4 (each half width is about 18 °) are completely separated.

  Further, when only OLEDs # 1 and # 5 are lit, the two intensity distributions are further separated on the left and right sides as compared with the case of FIG. Therefore, two people can view different images from both sides of the display device, and a dual display can be realized.

  In FIGS. 3 to 5, light is output in the direction of a large angle of about ± 50 ° or more, but these cannot be used for the intended image display. When these become problems as stray light, stray light may be removed by a technique such as inserting a light absorber between adjacent lenses (a dotted line portion perpendicular to the substrate surface in FIG. 2).

(Second Embodiment)
In the second embodiment of the present invention, the configuration of FIG. 1 is used as a lighting device. In this case, the unit pixel serves as a unit illumination element. For example, a liquid crystal display can be configured by arranging the configuration of FIG. 1 as a backlight behind the liquid crystal panel. In this case, it is only necessary to adjust the emission intensity of the corresponding OLED at the same time. Since the above-described pixel circuit is unnecessary, the driving circuit is very simple. For example, if the OLED # i (i = 1 to 3) constituting each sub-pixel 31 in FIG. 1 are connected to each other, in order to make the brightness on the backlight surface uniform, OLED # i ( It is only necessary to adjust the emission intensity for each of i = 1 to 3). The transmittance of the liquid crystal panel depends on the incident angle of light. In particular, in a generally used liquid crystal alignment type twisted nematic (TN) type liquid crystal, the angle formed with the normal direction of the display surface is 50 °. If it exceeds, the light transmittance is significantly reduced. In this case, the light in the large angular direction seen in the examples of FIGS. 3 to 5 is absorbed by the liquid crystal panel and is not output from the display. The arrangement of the unit illumination elements is not limited to a two-dimensional arrangement, and may be a one-dimensional arrangement, for example.

  As described above, the display device according to the embodiment of the present invention has been described using the organic EL display as an example, but the present invention is not limited thereto. Regarding displays using OLEDs, various configurations are known with respect to driving methods, coloring methods, materials used and manufacturing methods. For example, there are active driving methods and passive driving methods depending on whether TFTs are used. As described above, the colorization method includes a configuration in which three types of light emitting elements having different emission wavelengths are juxtaposed, and a configuration in which a white light emitting element and a color filter are combined. From the viewpoint of materials and manufacturing methods, there are OLEDs using low molecular weight materials manufactured by vacuum vapor deposition, and high molecular weight materials OLEDs manufactured by a method such as a transfer method using ink jet or laser light irradiation. The present invention is characterized in that the planar light emitting elements and the optical means (OLEDs # 1 to # 3 and the semicylindrical lens 21 in the example of FIG. 1) constituting the subpixels are arranged in correspondence with each other. Therefore, the present invention can be applied to any driving method of a planar light emitting element, any coloration method, any material, and any manufacturing method. For example, FIG. 1 shows an example of a top-emitting OLED, but the present invention can also be applied to a bottom-emitting OLED. This will be specifically described with reference to FIG.

  FIG. 6 is a cross-sectional view illustrating a configuration of a top emission type and a bottom emission type. 6A shows the same top emission type display device as that in FIG. 1, but the configuration of OLED (organic material layer, transparent electrode, metal electrode) omitted in FIG. 1, sealing material (protective layer) ). Here, regarding the thickness of each part, the thickness t1 of the lens is about 100 to 200 μm, the thickness t2 of the OLED part and the protective layer is about 1 μm, the thickness t3 of the substrate is about 200 μm, and the thickness t4 of the OLED part is It is less than 1 μm. On the other hand, FIG. 6B shows a bottom emission type display device. In the bottom emission type, light is transmitted to the outside through the transparent substrate of the OLED. This is equivalent to a configuration in which a transparent medium having a uniform thickness is inserted between the OLEDs # 1 to # 3 which are light emitting elements and the semicylindrical lens 21 in FIG. Accordingly, the basic design is the same only by limiting the lower limit of the design parameter L. 6B, the thickness t5 of the lens and the transparent substrate is about 200 to 400 μm, the thickness t2 of the OLED and the protective layer is about 1 μm, and the thickness of the lid made of metal or glass. The length t6 is about 100 to 1000 μm.

  Further, the planar light emitting element is not limited to the OLED, and may be, for example, an inorganic EL element. An inorganic EL element is a thin-film light emitting element having a structure in which an inorganic material and an electrode material are laminated, and is driven by applying a high AC voltage. Therefore, an OLED is used for an application requiring low power consumption such as a mobile phone. A display device manufactured by applying the present invention to an inorganic EL element is also effective for applications where power consumption is not a problem, although it is not suitable.

  Moreover, although the case where the number of OLED which comprises a sub pixel is an odd number was demonstrated above, an even number may be sufficient. For example, in FIG. 1, OLED # 2 may be divided into two parts and arranged in the center, and OLED # 1 and # 3 arranged in the periphery are divided into plural parts and arranged adjacent to each other. Also good.

  In addition, regarding the optical means, the case where a semi-cylindrical lens (lenticular lens) is used has been described above. However, the optical means arranged corresponding to a plurality of light emitting elements has a function of appropriately converting the light propagation angle. If it is a thing, various things can be used. For example, as shown in FIG. 7, hemispherical optical means (microlenses), not semicylindrical, are associated with a plurality of sets of planar light emitting elements (9 (3 × 3) in FIG. 7). The arranged micro lens array may be sufficient. In this case, by preparing images in the vertical direction in addition to those for the right eye and left eye, a stereoscopic image can be observed from the vertical and horizontal directions. A prism sheet or the like may be used. Regarding the shape of the optical means, the surface shape on the side where the light from the light emitting element is emitted does not have to be a part of a complete circle (arc), and the optical characteristics of the light emitting element actually used, Appropriate selection may be made according to the required specifications of the equipment.

  Further, the positional relationship between the optical means and the light emitting element may be appropriately designed. For example, as shown in FIGS. 8A to 8C, the light emitting elements can be arranged according to various lens shapes.

  Further, the optical means does not need to have an uneven shape like a lens, and may have a function of appropriately changing the light path. For example, a refractive index distribution type optical means as shown in FIG. 9 may be provided. In FIG. 9A, a thin layer having a periodically changing refractive index distribution is provided between two glass plates. FIG. 9B shows an example of an optical component (refractive index distribution type microlens) having a refractive index distribution that periodically changes in the vicinity of the surface. Such an optical component can be formed, for example, by implanting ions into a part of the surface of a glass plate and diffusing them.

  The optical means may be any means as long as it has a function of appropriately converting the light propagation angle as described above, and is not limited to means for refracting light. For example, a diffraction grating that propagates light in a predetermined direction by diffraction may be used.

  In addition, regarding the manufacturing method of the display device of the present invention, the optical component and the light emitting element are manufactured separately, the positions of both are aligned and bonded, the method of forming the microlens array directly on the surface of the light emitting element, Various methods such as a method of forming an OLED on the surface of a substrate on which a gradient index microlens is formed are possible.

1 is a perspective view showing a configuration of a display device according to a first embodiment of the present invention. FIG. 2 is a horizontal sectional view partially showing the display device shown in FIG. 1. It is a graph which shows angle distribution of the intensity | strength of the light radiated | emitted from each of OLED # 1- # 5. It is a graph which shows angle distribution of the intensity | strength of the light radiated | emitted when only OLED # 3 is lighted and when all OLED # 1- # 5 is lighted. It is a graph which shows angle distribution of the intensity | strength of the light radiated | emitted when OLED # 2 and # 4 are each lighted. It is sectional drawing which shows the structure of the display apparatus of the upper surface light emission type | mold and lower surface light emission type | mold which is a modified example of this invention. It is a perspective view which shows the display apparatus using the microlens array which is a modified example of this invention. It is sectional drawing which shows the positional relationship of the optical means and light emitting element which are the modified examples of this invention. It is sectional drawing which shows the display apparatus using the layer which has a refractive index distribution which is the deformation | transformation Example of this invention. It is sectional drawing which shows the conventional liquid crystal display which can switch a viewing angle electrically. It is a figure which shows the operation | movement of the stereoscopic display in the conventional liquid crystal display which has a function which switches the stereoscopic display by a binocular parallax system, and a planar image display. It is a figure which shows the switching operation | movement in the conventional liquid crystal display which has a function which switches the stereoscopic display by a binocular parallax system, and a planar image display.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Semi-cylindrical lens array 3 Unit pixel 4, 4 'Drive circuit 21 Semi-cylindrical lens 31 Subpixel OLED # 1- # 3 Organic light emitting element

Claims (3)

A plurality of predetermined number of light emitting elements formed on the substrate;
A drive circuit for adjusting the light emission amount of each of the light emitting elements;
Optical means disposed on the light emitting element,
The predetermined number of the light emitting elements and the optical means constitute one sub-pixel;
One subpixel and a plurality of subpixels adjacent to the periphery of the subpixel constitute a unit pixel,
Among spectral intensity distributions of light emitted from a plurality of sub-pixels constituting the unit pixel, at least two spectral intensity distributions are different from each other,
A plurality of the unit pixels are arranged two-dimensionally,
The optical means guides light emitted from each of the light-emitting elements in the sub-pixel or the light-emitting element group that is a partial set of the light-emitting elements in the sub-pixel in different directions;
The optical means is a lens;
At least three light emitting elements included in one subpixel are disposed at positions facing the curved surface of the lens,
In the first mode, the driving circuit performs narrow-field display by turning on only the light emitting element located in the center, and in the second mode, stereoscopic display is achieved by turning on only the light emitting elements located on both sides. And performing a wide-field display by turning on all the light emitting elements in the third mode . The single-screen display device according to claim 1, wherein the light-emitting element is an organic EL light-emitting element. 2. The one-screen display device according to claim 1, wherein the optical unit is any one of a semi-cylindrical lens, a micro lens, and a refractive index distribution type optical unit.

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