JP2013084477A - Transparent display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent display device which causes a transmission image from a background not to be faded.SOLUTION: A transparent display device comprises: a display panel 101 which has first metal wiring 111 and second metal wiring 112 that are disposed in matrix, display elements 120 for displaying a display image, and a plurality of light transmission parts 130 each of which corresponds to a region between adjacent first metal wiring 111 and the second metal wiring 112; first optical elements 141 provided in either one of a front side and a rear side of the display panel 101; and second optical elements 142 provided in the other one of the front side and the rear side of the display panel 101. In this transparent display device, the first optical elements 141 and the second optical elements 142 are arranged so that parallel light entered from either one of the front side and the rear side of the display panel 101 is focused on the light transmission parts 130, and exits as parallel light from the other one of the front side and the rear side of the display panel 101.

Description

  The present invention relates to a transparent display device, and more particularly to a transparent display device capable of displaying images and character information and having a transparent display surface.

  In recent years, a transparent display device that has a light emitting layer sandwiched between a pair of transparent electrodes, can display images and text information on both sides, and shows a transparent background has attracted attention. In particular, a transparent display device using an organic EL (Electro-Luminescence) panel has attracted attention (for example, see Patent Document 1).

JP 2007-071948 A

  By the way, the transparent display device is desired to display a high-definition and large display image on a display panel. However, when a high-resolution display panel is used to obtain a high-definition display image, there is a problem that a transmission image coming from the background is blurred.

  An object of the present invention is to solve such a problem, and to provide a transparent display device that displays a high-definition and large display image on a display panel and does not blur a transmission image from the background.

  In order to solve the above problems, a transparent display device according to an embodiment of the present invention is provided with a plurality of metal wirings arranged in a matrix and a signal for displaying a display image supplied from the metal wirings. A display panel having a display element and a plurality of light transmission portions corresponding to regions between the adjacent metal wirings, a first optical element provided on either the front side or the back side of the display panel, A second optical element provided on either the front side or the back side of the display panel, and the first optical element and the second optical element are incident from either the front side or the back side of the display panel The parallel light is focused at the light transmission part and is emitted as parallel light from either the front side or the back side of the display panel. It is.

  According to the present invention, a high-definition and large display image can be displayed on a display panel, and a transparent display device in which a transmission image is not blurred can be provided.

FIG. 1A is a perspective view showing a schematic configuration of a transparent display device according to Embodiment 1 of the present invention. FIG. 1B is a side view of the transparent display device according to Embodiment 1 of the present invention. FIG. 2A is an enlarged plan view of the transparent display device according to Embodiment 1 of the present invention. FIG. 2B is a cross-sectional view of the transparent display device according to Embodiment 1 of the present invention, taken along line A-A ′ of FIG. 2A. FIG. 3 is a cross-sectional view showing the configuration of the display element in the display panel of the transparent display device according to Embodiment 1 of the present invention. FIG. 4 is a diagram showing a configuration of a pixel circuit (TFT portion) in the display element of the transparent display device according to Embodiment 1 of the present invention. FIG. 5 is an enlarged plan view of a transparent display device according to Modification 1 of Embodiment 1 of the present invention. FIG. 6 is a cross-sectional view showing the configuration of the display element in the display panel of the transparent display device according to Modification 2 of Embodiment 1 of the present invention. FIG. 7 is an enlarged plan view of a transparent display device according to Modification 3 of Embodiment 1 of the present invention. FIG. 8 is a cross-sectional view of a transparent display device according to Embodiment 2 of the present invention. FIG. 9 is a cross-sectional view of a transparent display device according to Embodiment 3 of the present invention. FIG. 10 is a cross-sectional view of a transparent display device according to Embodiment 4 of the present invention. FIG. 11A is an enlarged plan view of a transparent display device according to Embodiment 5 of the present invention. FIG. 11B is a cross-sectional view of the transparent display device according to Embodiment 5 of the present invention taken along line A-A ′ of FIG. 11A. FIG. 12A is an enlarged plan view of a transparent display device according to a modification of Embodiment 5 of the present invention. FIG. 12B is a cross-sectional view of the transparent display device according to the modification of the fifth embodiment of the present invention taken along line A-A ′ of FIG. 12A. FIG. 13A is an enlarged plan view of a transparent display device according to Embodiment 6 of the present invention. FIG. 13B is a cross-sectional view of the transparent display device according to Embodiment 6 of the present invention taken along line A-A ′ of FIG. 13A. FIG. 14A is a plan view showing an example of an optical member in a transparent display device according to a modification of the embodiment of the present invention. FIG. 14B is a cross-sectional view of the optical member according to a modification of the embodiment of the present invention taken along line B-B ′ in FIG. 14A. FIG. 15A is a cross-sectional view illustrating an example of a conventional transparent display device. FIG. 15B is a schematic plan view of the conventional transparent display device shown in FIG. 15A.

  Hereinafter, a transparent display device according to an embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment, but is specified based on description of a claim. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the claims are not necessarily required to achieve the object of the present invention, but are described as constituting more preferable embodiments. . In the drawings, the same components are denoted by the same reference numerals.

  Prior to the description of the embodiments of the present invention, the background to the present invention will be described.

  First, a conventional transparent display device 1000 will be described with reference to FIGS. 15A and 15B. FIG. 15A is an example of a conventional transparent display device, and is a cross-sectional view perpendicular to a light emitting surface (display surface). FIG. 15B is a schematic plan view of the conventional transparent display device shown in FIG. 15A.

  As shown in FIGS. 15A and 15B, the conventional transparent display device 1000 has a structure in which an EL panel 1100 and a liquid crystal light control sheet 1200 are bonded together with an adhesive region 1300 having transparency.

  The EL panel 1100 includes a pair of transparent substrates 1130 and 1140, a light emitting layer 1120 sandwiched between the pair of transparent substrates 1130 and 1140, a plurality of transparent wirings 1111 formed on one transparent substrate 1130, A plurality of transparent wirings 1112 formed on the other transparent substrate 1140.

  As shown in FIG. 15B, the transparent display device 1000 uses a passive matrix driving type EL panel 1100, and the plurality of transparent wirings 1111 on the transparent substrate 1130 are parallel to the light emitting surface and are in the first direction. The plurality of transparent wirings 1112 on the transparent substrate 1140 are parallel to the light emitting surface and extend in parallel to a second direction orthogonal to the first direction.

  In the conventional transparent display device 1000 using such a passive matrix driving method, since transparent wirings 1111 and 1112 are used, there is no object on the display device that obstructs a transmission image coming from the background. I was able to get a statue. However, in the passive matrix driving method, the light emitting regions (pixels) arranged corresponding to the intersections of the transparent wirings 1111 and 1112 are sequentially scanned, and the transparent wirings 1111 and 1112 are originally high resistance. As the wiring distance is increased, the wiring resistance is further increased. Therefore, there is a problem in that pixels other than the pixel desired to emit light emit light and crosstalk occurs. For this reason, in the conventional transparent display device 1000, it is difficult to display a high-definition and large display image on the display. Therefore, the existing passive matrix drive type transparent display device has a resolution of 240 × 320 dpi, a pixel pitch of 0.153 mm, and a size of about 2.4 inches at most.

  However, in recent years, there has been a demand for a large screen display device, and for a transparent display device, it is desired to display a high-definition and large display image on a display panel. In order to display a high-definition and large display image on a display panel, it is necessary to accurately apply a rated current or voltage to each pixel. Therefore, a thin film transistor (TFT) is arranged as a switching element in a pixel. Therefore, it is preferable to use an active matrix driving panel that controls each pixel independently. Therefore, a low resistance metal wiring has to be used as a wiring for supplying a desired signal to each pixel.

  However, since the low-resistance metal wiring has light shielding properties and is formed in a matrix (matrix) lattice shape, in principle, the finer the lattice shape, the more it acts on the transmission image as a diffraction grating. It has become clear. Therefore, when a high-resolution display panel is used by increasing the pixel resolution in order to obtain a high-definition display image, there is a problem that a transmission image coming from the background is blurred.

  In order to solve the above-mentioned problem, the inventor has conducted intensive studies. As a result, the parallel light incident on one display surface of the display panel having the display surfaces on both sides is kept parallel from the other surface of the display panel. By providing an optical element configured to be emitted in a state, it was possible to obtain an idea that blurring of a transmitted image can be suppressed.

  The present invention has been made based on such an idea, and one aspect of the transparent display device according to the present invention includes a plurality of metal wirings arranged in a matrix and a signal for displaying a display image. A display panel having a display element supplied from the metal wiring and a plurality of light transmission portions corresponding to a region between the adjacent metal wirings, and provided on either the front side or the back side of the display panel A first optical element, and a second optical element provided on either the front side or the back side of the display panel, wherein the first optical element and the second optical element are the front side and the back side of the display panel. The parallel light incident from either one of the light is focused on the light transmission part, and parallel light is emitted from either the front side or the back side of the display panel. And it is configured to emit Te.

  According to this aspect, the transmission image can be transmitted from one surface of the display panel to the other surface without blurring by the first optical element and the second optical element. Thereby, a high-definition and large display image can be displayed on the display panel using the low-resistance metal wiring.

  In the aspect of the transparent display device according to the present invention, the display element includes a pair of electrodes and a light emitting layer sandwiched between the pair of electrodes, and the light emitting layer is supplied from the metal wiring. It can be configured to emit light in response to a signal. In this case, the light emitting layer may be disposed on the light transmission part. Alternatively, the light emitting layer may be disposed on an intersection where the plurality of metal wirings intersect.

  In the aspect of the transparent display device according to the present invention, it is preferable that the first optical element and the second optical element cover the light transmission part. In this case, the first optical element and the second optical element are lenses, and the shape of the light transmission portion is rectangular when viewed from the one surface side or the other surface side of the display panel. The diameter of the lens can be made larger than the length of the diagonal line of the light transmission part.

  In the aspect of the transparent display device according to the present invention, it is preferable that the first optical element or the second optical element has a light-shielding film formed on a surface on the light transmission part side.

  Moreover, the aspect of the transparent display device according to the present invention preferably further includes a convex lens disposed in front of the display element portion.

  The transparent display device according to the aspect of the invention may further include a third optical element adjacent to the second optical element, the first optical element, the second optical element, and the third optical element. Are arranged in a row with the light transmission portion in between, and the first optical element, the second optical element, and the third optical element are configured by a spherical lens.

  In one aspect of the transparent display device according to the present invention, at least one of the first optical element and the second optical element may be a Fresnel lens.

  In the aspect of the transparent display device according to the present invention, each of the first optical element and the second optical element may be integrally formed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a transparent display device according to the present invention will be described in detail based on embodiments.

(Embodiment 1)
First, a schematic configuration of the transparent display device 1 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1A and 1B. 1A is a perspective view showing a schematic configuration of a transparent display device according to Embodiment 1 of the present invention, and FIG. 1B is a side view of the transparent display device according to Embodiment 1 of the present invention.

  As shown in FIGS. 1A and 1B, a transparent display device 1 according to the present embodiment includes a display panel 101 having a display unit for displaying a display image such as an image or character information, and a surface of the display panel 101. A first optical element unit 201 and a second optical element unit 202 are provided on both sides.

  As an example of the display panel 101, an organic EL panel having a size of 20 and having a length of about 270 mm and a width of about 460 mm can be used. In the present embodiment, the total thickness of the transparent display device 1 is about 2.1 mm. Among these, the thickness of the display panel 101 is about 1.4 mm, and the thickness of the first optical element portion 201 is about 0.2 mm. The thickness of the second optical element portion 202 is about 0.5 mm.

  Next, a detailed configuration of the transparent display device 1 according to the present embodiment will be described with reference to FIGS. 2A and 2B. 2A is an enlarged plan view of the transparent display device according to Embodiment 1 of the present invention, and FIG. 2B is a cross-sectional view of the transparent display device taken along line A-A ′ of FIG. 2A. FIG. 2A shows a front view of the transparent display device 1 when viewed from the observer 20.

  As shown in FIGS. 2A and 2B, the display panel 101 includes a metal wiring part 110 made of a plurality of metal wirings arranged in a matrix, a plurality of display elements 120 for displaying a display image, and light transmission. And a plurality of light transmitting portions 130.

  The metal wiring part 110 is orthogonal to the plurality of first metal wirings 111 and the plurality of first metal wirings 111 formed in a straight line along the row direction which is the first direction in FIG. And a second metal wiring 112 formed linearly in parallel along the column direction.

  A predetermined current or voltage is supplied as a signal (display data) for displaying a display image from a driver (not shown) to the plurality of first metal wirings 111 and the plurality of second metal wirings 112. Display data is supplied to 120. The first metal wiring 111 and the second metal wiring 112 can be formed using a low-resistance metal material. For example, the first metal wiring 111 and the second metal wiring 112 are formed using a light-shielding metal such as aluminum (Al) or copper (Cu). can do. In the present embodiment, the first metal wiring 111 and the second metal wiring 112 both have a line width of about 40 μm. Although not shown, an insulating member such as an insulating film is formed between the plurality of first metal wires 111 and the plurality of second metal wires 112, and the first metal wires 111 and the second metal wires 112 Is insulated.

  The metal wiring portion 110 includes not only wiring for supplying signals such as scanning lines and data lines but also metal electrodes such as capacitors that can cause diffraction.

  Each of the display elements 120 (display element unit) corresponds to a pixel for displaying a display image, and a signal for displaying the display image is supplied from the first metal wiring 111 and the second metal wiring 112. In the present embodiment, as shown in FIG. 2A, each display element 120 is disposed on an intersection where the first metal wiring 111 and the second metal wiring 112 intersect, It is arranged in a position that does not overlap. In the present embodiment, the planar view shape (front view shape) of each display element 120 is a rectangular shape having a length of 35 μm and a width of 35 μm.

  Each of the plurality of light transmitting portions 130 is a region between adjacent metal wirings. In the present embodiment, as shown in FIG. 2A, the second metal wiring 112 adjacent to the first metal wiring 111 adjacent to each other. It is an area surrounded by. Each light transmitting portion 130 is a region that transmits light, transmits light incident from one surface side of the display panel 101, and emits light from the other surface side of the display panel 101. For example, the observer 20 on the front side of the display panel 101 can visually recognize a background, a person, or the like on the other side of the transparent display device 1 as a transmission image through the light transmission unit 130. In the present embodiment, the planar shape of each light transmitting portion 130 is a square having a side of 80 μm.

  Further, as shown in FIG. 2B, the first optical element unit 201 is provided on the front side of the display panel 101 (the side where the display element 120 is provided in the present embodiment), while the second optical element 201 is provided. The element portion 202 is provided on the back side of the display panel 101 (in this embodiment, the side where the display element 120 is not provided). In the first optical element unit 201 and the second optical element unit 202, parallel light incident from either the front side or the back side of the display panel 101 is focused on the light transmission unit 130, and It is comprised so that it may radiate | emit as parallel light from either one.

  In the present embodiment, the first optical element unit 201 is configured by one first optical element 141 disposed on the front side of the display panel 101. The second optical element unit 202 is configured by two optical elements, a second optical element 142 and a third optical element 143, which are arranged on the back side of the display panel 101. That is, the optical system in the present embodiment is configured by three optical elements.

  More specifically, the three optical elements of the first optical element 141, the second optical element 142, and the third optical element 143 are arranged at a position overlapping the light transmission unit 130 when viewed from the front, and It is arranged at the overlapping position. In addition, as shown in FIG. 2B, one first optical element 141 and two optical elements, the second optical element 142 and the third optical element 143, are arranged in a row with the light transmission part 130 interposed therebetween. . The first optical element 141 and the second optical element 142 are arranged to face each other with the light transmission part 130 interposed therebetween, the third optical element 143 is arranged to be adjacent to the second optical element 142, and The second optical element 142 is disposed outside the second optical element 142.

  In the present embodiment, each of the first optical element 141, the second optical element 142, and the third optical element 143 is configured by a spherical lens having a predetermined focal point and a function of converging incident parallel rays. ing. The first optical element 141 and the second optical element 142 arranged at the position closest to the light transmission unit 130 are both configured so that the focal point is located in the light transmission unit 130. The third optical element 143 is configured such that the focal point coincides with the focal point of the second optical element 142.

  The first optical element 141, the second optical element 142, and the third optical element 143 are arranged so that the center of each spherical lens coincides with the center of the light transmission unit 130. Further, in the present embodiment, the first optical element 141, the second optical element 142, and the third optical element 143 are configured to cover the light transmission portion 130 when viewed from the front. That is, the virtual area of each optical element in the front view is configured to be larger than the virtual area of the light transmission unit 130 in the front view. Specifically, the diameter D of each lens is configured to be larger than the length of the diagonal line L of the light transmitting portion 130. In this embodiment, the diameter D of each lens is about 110 μm, The diagonal line L of the transmission part 130 is about 110 μm. As the first optical element 141, the second optical element 142, and the third optical element 143, for example, a transparent resin such as an acrylic resin having a refractive index of about 1.4, optical glass, or the like can be used.

  In order to prevent the display element 120 from deteriorating, the display element 120 may be covered with a transparent material that seals one surface of the display element 120 and the light transmission portion 130. Furthermore, by using an adhesive made of a transparent resin as the transparent material, the first optical element 141 disposed on the front side (observer 20 side) of the display panel 101 can be held in contact with the display panel 101. it can.

  Further, the second optical element 142 and the third optical element 143 arranged on the back side (the reflective object 10 side) of the display panel 101 can also be held on the display panel 101 by using an adhesive made of a transparent resin. However, when it is necessary to provide an air layer between the second optical element 142 and the third optical element 143 (between the lenses) or between the second optical element 142 and the display panel 101 (between the lenses and the panel), The second optical element 142 and the third optical element 143 can be held by raising a support member such as a rib on the first metal wiring 111 and the second metal wiring 112.

  Next, the detailed structure of each display element 120 in this Embodiment is demonstrated using FIG. FIG. 3 is a cross-sectional view showing the configuration of the display element in the display panel of the transparent display device according to Embodiment 1 of the present invention.

  As shown in FIG. 3, the display element 120 in this embodiment includes an organic EL element 123 having a light emitting layer, and is a self-luminous display element (light emitting portion). The display element 120 includes a TFT substrate 121 on which a control element (thin film transistor) for controlling light emission of the organic EL element 123 is formed. The TFT substrate 121 includes a driving transistor that controls a driving current for the organic EL element 123 for each pixel, a switching transistor that selectively switches the organic EL element 123 of the pixel that emits light, a capacitor that controls charge, and the like. Is provided.

  A flattening film 122 is formed on the TFT substrate 121, and an organic EL element 123 is formed on the flattening film 122. The organic EL element 123 includes a pair of electrodes and a light emitting layer sandwiched between the pair of electrodes. The organic EL element 123 in the present embodiment is a bottom-up type, and is formed on the planarization film 122 in sequence, the first conductive layer 123a that is an anode, the hole injection / transport layer 123b, and the light emitting layer 123c. , An electron injection / transport layer 123d and a second conductive layer 123e which is a cathode.

  The planarization film 122 is a layer formed until the surface is planarized so as to reduce the unevenness of the TFT substrate 121 caused by a transistor or the like. The post-process can be accurately performed by the planarization film 122.

  The first conductive layer 123a and the second conductive layer 123e are electrodes for injecting current into the light emitting layer 123c. In the present embodiment, the first conductive layer 123a and the second conductive layer 123e are electrically connected to the first metal wiring 111 and the second metal wiring 112 shown in FIGS. 2A and 2B. The first conductive layer 123a (lower electrode) can be configured as a reflective electrode made of silver alloy APC or the like, and the second conductive layer 123e (upper electrode) can be configured as a transparent electrode made of ITO or the like. be able to.

  The hole injection / transport layer 123b and the electron injection / transport layer 123d are layers for efficiently injecting and transporting holes and electrons in order to improve the light emission efficiency. These layers are selected according to the purpose for which importance is placed on the difference in material, efficiency, cost, etc., for example, only the injection layer, only the transport layer, or no injection layer or transport layer at all. . Therefore, the number of layers of the hole injection / transport layer 123b and the electron injection / transport layer 123d varies depending on the purpose and performance.

When a predetermined voltage is applied to the first conductive layer 123a and the second conductive layer 123e, the light emitting layer 123c emits light by exciting the light emitting material constituting the light emitting layer 123c. The light emitting layer 123c is formed of an organic light emitter made of an organic material, and for example, tris (8-quinolinolato) aluminum complex (Alq ₃ ) or the like can be used.

  In the organic EL element 123 configured as described above, a current (writing information for a display image) from the TFT substrate 121 flows into the first conductive layer 123a which is an anode, and passes through the hole injection / transport layer 123b. After flowing efficiently through the light emitting layer 123c and recombining electrons and holes, the light flows through the electron injecting / transporting layer 123d to the second conductive layer 123e which is a cathode.

  Note that the layer configuration of the organic EL element 123 is an example, and is not limited to the above-described layer configuration, and other known layer configurations as the organic EL element can be used as appropriate.

  Next, referring to FIG. 4, a current flow until the TFT substrate 121 receives a video signal and sends it to the organic EL element 123, that is, an operation when a display image is displayed on the display unit (pixel) of the display panel 101. Will be described. FIG. 4 is a diagram showing a configuration of a pixel circuit (TFT portion) in the display element of the transparent display device according to Embodiment 1 of the present invention.

  As shown in FIG. 4, each pixel 122PX in the planarization film 122 is partitioned by orthogonal scanning lines (gate lines) 122GL and data lines (source lines) 122DL, and driving transistors 122Dr for driving the pixels 122PX , A switching transistor 122Sw, a capacitor (capacitance) 122C, and the organic EL element 123 described above. The driving transistor 122Dr is a transistor that drives the organic EL element 123. The gate is connected to the drain of the switching transistor 122Sw, the drain is connected to the power supply line 122PL, and the source is connected to the anode of the organic EL element 123. ing. The switching transistor 122Sw is a transistor for selectively switching the pixel 122PX that emits light from a plurality of pixels, that is, a transistor for selecting a pixel that supplies a video signal from the plurality of pixels, and a gate for scanning. The source is connected to the line 122GL, the source is connected to the data line 122DL, and the drain is connected to the capacitor 122C and the gate of the driving transistor 122Dr.

  In this configuration, when the gate signal among the signals for displaying the display image flows into the gate of the switching transistor 122 Sw via the scanning line 122 GL, the switching transistor 122 Sw is turned on. At this time, a video signal (current signal) among signals for displaying a display image flows from the data line 122DL to the source of the switching transistor 122Sw, to the drain of the switching transistor 122Sw, and to the gate of the driving transistor 122Dr. Flow into. On the other hand, at the same time, a charge corresponding to the video signal is accumulated in the capacitor 122C connected to the power supply line 122PL. Next, the charge accumulated in the capacitor 122C flows into the source of the driving transistor 122Dr, and then a current proportional to the video signal flows into the drain of the driving transistor Dr, and the current is supplied to the anode of the organic EL element 123. . That is, the video signal voltage stored in the capacitor 122C is held for one frame period, and the held video signal voltage causes the conductance of the driving transistor 122Dr to change in an analog manner, thereby driving current corresponding to the light emission gradation. Flows from the anode to the cathode of the organic EL element 123. Thereby, the organic EL element 123 emits light.

  Next, effects of the transparent display device 1 according to Embodiment 1 of the present invention will be described with reference to FIGS. 2A, 2B, and 4. FIG.

  As shown in FIG. 4, in the TFT substrate, the metal wiring by the scanning line 122GL, the data line 122DL, and the power supply line PL is formed in a pattern so as to surround each pixel. Here, the scanning line 122GL, the data line 122DL, and the power supply line PL correspond to the first metal wiring 111 and the second metal wiring 112 in FIGS. 2A and 2B. For example, the scanning line 122GL corresponds to the first metal wiring 111, the data line 122DL corresponds to the second metal wiring 112, and the power supply line PL corresponds to one of the second metal wirings 112. In FIG. 4, the driving transistor 122Dr, the switching transistor 122Sw, and the capacitor 122C are arranged in one of the first metal wiring 111 and the second metal wiring 112.

  As described above, when a high-resolution display panel is used to obtain a high-definition display image, there is a problem that a transmission image transmitted through the display panel 101 is blurred. The main cause of the blurred transmission image is light diffraction depending on the shape of the metal wiring (first metal wiring 111, second metal wiring 112, etc.) printed on the TFT substrate.

  Therefore, in the transparent display device 1 according to the present embodiment, the first optical element unit 201 and the second optical element unit 202 are provided on both sides of the display panel 101 to suppress the blur of the transmission image.

  According to the transparent display device 1 according to the present embodiment, the first optical element 141 and the second optical element 142 are arranged so as to sandwich the light transmission part 130, and the focal point is located in the light transmission part 130. It is configured as follows. As a result, the parallel light incident from one surface of the display panel 101 is focused at the light transmission unit 130 and is emitted from the other surface of the display panel 101.

  Further, in the present embodiment, the third optical element 143 is provided outside the second optical element 142. With this configuration, as shown in FIG. 2B, the parallel light beam 10 </ b> L reflected from the reflecting object 10 existing on the back side of the display panel 101 passes through the third optical element 143 and the second optical element 142 and is A focal point is formed at the position of the light transmission part 130, and the light reaches the front side of the display panel 101 via the first optical element 141. Thereby, the observer 20 on the front side of the display panel 101 can visually recognize the transmission image 10 </ b> A coming from the back side of the display panel 101.

  As described above, in the present embodiment, the transmission image 10A (parallel light beam 10L) transmitted through the display panel 101 is focused on the light transmission unit 130, and thus depends on the lattice shape of the first metal wiring 111 and the second metal wiring 112. The influence of diffraction can be eliminated. Thereby, it is possible to prevent the transmission image 10A transmitted through the display panel 101 from being blurred. Therefore, since low resistance metal wiring can be used for the display panel 101, a transparent display device capable of displaying a high-definition and large display image can be realized.

  In addition, in the present embodiment, the third optical element 143 is provided outside the second optical element 142. Thereby, the observer 20 can visually recognize the transmission image 10A transmitted through the display panel 101 as a normal image (an image in the same direction as the reflective object 10). In the present embodiment, since the first optical element 141, the second optical element 142, and the third optical element 143 are lenses having the same effective diameter, the observer 20 transmits the transmitted image 10A having the same size as the reflecting object 10. Can see.

  Furthermore, in the present embodiment, the first optical element 141, the second optical element 142, and the third optical element 143 are configured by a spherical lens that covers the light transmitting portion 130, and the diameter D of each lens is The light transmission part 130 is configured to be longer than the length of the diagonal line L. As a result, even if the diagonal line L of the light transmission part 130 is small and the light transmission region is narrow, the transmission image 10A coming from the background can be collected by these optical elements. The image 10A can be brightened. Further, the stray light from the peripheral portion does not enter the optical element (spherical lens) by positively reducing the length of the diagonal line L of the light transmitting portion 130 and narrowing the light transmitting region, so that the transmitted image 10A is further improved. It becomes clearer.

(Modification 1 of Embodiment 1)
Next, a transparent display device 1A according to Modification 1 of Embodiment 1 of the present invention will be described with reference to FIG. FIG. 5 is an enlarged plan view of a transparent display device according to Modification 1 of Embodiment 1 of the present invention.

  The transparent display device 1A according to this modification shown in FIG. 5 is different from the transparent display device 1 according to Embodiment 1 shown in FIG. 2B in the arrangement position of the display elements. That is, the display element 120 in the first embodiment described above is arranged on the intersection of the first metal wiring 111 and the second metal wiring 112, but as shown in FIG. The display element 120A is disposed on the light transmission part 130.

  In this modification, most of the display element 120 </ b> A is arranged so as to overlap with the light transmission part 130, but a part thereof is arranged so as to overlap with the first metal wiring 111 and the second metal wiring 112.

  The configuration of the display element 120A in the present modification is the same as that of the display element 120 of the first embodiment shown in FIGS. 3 and 4, but in the present modification, the second conductive layer 123e (upper electrode) ) As well as the first conductive layer 123a (lower electrode).

  As described above, according to the transparent display device 1A according to the present modification, the first optical element 141 and the second optical element 142 are arranged so as to sandwich the light transmission part 130, as in the first embodiment. The effect similar to the form 1 of this can be show | played. That is, it is possible to suppress blurring of a transmission image transmitted through the display panel 101.

  Furthermore, in this modification, the light emitting layer 123c of the organic EL element 123 is disposed on the light transmission part 130, and the first conductive layer 123a and the second conductive layer 123e sandwiching the light emitting layer 123c are Is also a transparent electrode. Thereby, since there is no object that reflects light in any of the vertical directions of the light emitting layer 123c, the light of the light emitting layer 123c travels to both the front side and the back side of the display panel 101. Therefore, since display images can be displayed on both the front side and the back side of the display panel 101, a transparent display device capable of double-sided display can be realized.

(Modification 2 of Embodiment 1)
Next, a transparent display device 1B according to Modification 2 of Embodiment 1 of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view showing the configuration of the display element in the display panel of the transparent display device according to Modification 2 of Embodiment 1 of the present invention.

  The transparent display device 1B according to this modification is different from the transparent display device 1 according to the first embodiment in the configuration of the display element. That is, the display element 120 in the first embodiment is configured by an organic EL element, whereas the display element 120B in the present modification is configured by an inorganic EL element.

  FIG. 6 shows an example of the basic structure of the inorganic EL element. As shown in FIG. 6, the display element 120 </ b> B in this modification example includes a first electrode 152, a first insulating layer 153, a light emitting layer 154, a second insulating layer 155, and a first electrode on a substrate 151. Two electrodes 156 are stacked in this order. The light emitting layer 154 is made of a phosphor made of an inorganic EL material such as ZnS, CdS, ZnSe or the like.

  In the display element 120B configured as described above, when an alternating voltage of about 1,000,000 V / cm is applied between the first electrode 152 and the second electrode 156, electrons accelerated by a high electric field emit light. The phosphor luminescent centers in layer 154 are collisionally excited and emit light as they relax. The first insulating layer 153 and the second insulating layer 155 have a function of limiting current flowing in the light emitting layer 154, can suppress dielectric breakdown of the inorganic EL, and have stable light emitting characteristics. Acts as obtained. The first electrode 152 and the second electrode 156 are connected to the first metal wiring 111 and the second metal wiring 112 in FIGS. 2A and 2B, respectively.

  As described above, according to the transparent display device 1B according to this modification, even when an inorganic EL element is used as the display element 120B, the same effects as those of the first embodiment can be obtained. That is, it is possible to suppress blurring of a transmission image transmitted through the display panel 101.

  Note that the structure of the display element 120B illustrated in FIG. 6 is an example, and the structure is not limited thereto, and other known layer structures can be appropriately used as the inorganic EL element.

(Modification 3 of Embodiment 1)
Next, a transparent display device 1C according to Modification 3 of Embodiment 1 of the present invention will be described with reference to FIG. FIG. 7 is an enlarged plan view of a transparent display device according to Modification 3 of Embodiment 1 of the present invention.

  The transparent display device 1C according to this modification shown in FIG. 7 is different from the transparent display device 1 according to Embodiment 1 shown in FIG. 2B in the configuration of the display element. That is, the display element 120 in the first embodiment is a self-luminous display element, whereas the display element 120C in the present modification is a non-luminous display element as shown in FIG. It is.

  In this modification, the non-light emitting display element 120C is configured by a liquid crystal display element and a color filter. In addition, the display element 120 </ b> C is disposed on the light transmission unit 130.

  As described above, according to the transparent display device 1C according to the present modification, the first optical element 141 and the second optical element 142 are arranged so as to sandwich the light transmission part 130, as in the first embodiment. The effect similar to the form 1 of this can be show | played. That is, it is possible to suppress blurring of a transmission image transmitted through the display panel 101.

  Further, in the present modification, the display element 120 </ b> C configured by a liquid crystal display element is disposed on the light transmission part 130, and therefore, the liquid crystal display element is irradiated with light from the back that has passed through the light transmission part 130. can do. That is, natural light transmitted through the light transmission unit 130 can be used as a backlight of the liquid crystal display element. Thus, for example, when the liquid crystal display element is a normally black type, light is transmitted when a voltage is applied to the liquid crystal (when ON), and light is transmitted when no voltage is applied to the liquid crystal (when OFF). Since it is blocked, color display can be performed.

(Embodiment 2)
Next, the transparent display device 2 according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view of a transparent display device according to Embodiment 2 of the present invention.

  The transparent display device 2 according to the present embodiment shown in FIG. 8 is different from the transparent display device 1 according to the first embodiment shown in FIG. 2B in the configuration of the first optical element unit 201 and the second optical element unit 202. It is.

  That is, in the first embodiment, the first optical element unit 201 on the viewer 20 side (side on which the display element 120 is provided) is provided with one optical element (first optical element 141), and the background side. While the second optical element unit 202 (on the reflective object 10 side) is provided with a plurality of optical elements (second optical element 142 and third optical element 143), as shown in FIG. In this embodiment, the first optical element unit 201 on the observer 20 side is provided with a plurality of optical elements, and the second optical element unit 202 on the background side is provided with one optical element.

  Specifically, as shown in FIG. 8, the first optical element unit 201 is configured by two optical elements, a first optical element 241 and a third optical element 243 that are arranged on the front side of the display panel 101. . Further, the second optical element unit 202 is configured by one second optical element 242 disposed on the back side of the display panel 101.

  As in the first embodiment, the first optical element 241, the second optical element 242, and the third optical element 243 are arranged at a position overlapping the light transmission unit 130 when viewed from the front, and at a position overlapping each other. It is arranged in a row. Also in the present embodiment, each of the first optical element 241, the second optical element 242, and the third optical element 243 is configured by a spherical lens having a predetermined focal point and a function of converging incident parallel rays. Has been. The first optical element 241 and the second optical element 242 that are disposed closest to the light transmission unit 130 are configured such that the focal point is located in the light transmission unit 130. The third optical element 243 is configured so that the focal point coincides with the focal point of the first optical element 241.

  Also in the present embodiment, the first optical element 141, the second optical element 142, and the third optical element 143 are configured to cover the light transmission part 130 when viewed from the front.

  As described above, according to the transparent display device 2 according to the present embodiment, similarly to the first embodiment, the first optical element 241 and the second optical element 242 are arranged so as to sandwich the light transmission part 130, and both are in focus. Is configured to be located in the light transmitting portion 130. As a result, the parallel light incident from one surface of the display panel 101 is focused at the light transmission unit 130 and is emitted from the other surface of the display panel 101.

  Further, in the present embodiment, a third optical element 243 is provided outside the first optical element 241. With this configuration, as shown in FIG. 8, the parallel light beam 10 </ b> L reflected from the reflective object 10 existing on the back side of the display panel 101 passes through the second optical element 242 and is positioned at the light transmitting portion 130 of the display panel 101. Is focused and reaches the front side of the display panel 101 via the first optical element 241 and the third optical element 243. Thereby, the observer 20 on the front side of the display panel 101 can visually recognize the transmission image 10 </ b> A coming from the back side of the display panel 101.

  As described above, also in the present embodiment, the transmission image 10A (parallel light beam 10L) that is transmitted through the display panel 101 is focused on the light transmission portion 130, so that the lattice shape of the first metal wiring 111 and the second metal wiring 112 is increased. The influence of diffraction due to can be eliminated. Therefore, it is possible to suppress blurring of the transmission image 10A that is transmitted through the display panel 101.

  Also in the present embodiment, since the third optical element 243 is provided, the observer 20 can visually recognize the transmitted image 10A transmitted through the display panel 101 as a normal image.

  Further, also in this embodiment, each optical element is configured to cover the light transmission part 130, so that even if the light transmission region of the light transmission part 130 is narrow, the transmission image coming from the background 10A can be brightened. Further, by narrowing the light transmission region of the light transmission unit 130, the transmitted image 10A can be made clearer.

(Embodiment 3)
Next, a transparent display device 3 according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view of a transparent display device according to Embodiment 3 of the present invention.

  The transparent display device 3 according to the present embodiment shown in FIG. 9 is different from the transparent display device 1 according to the first embodiment shown in FIG. 2B in the configuration of the first optical element unit 201 and the second optical element unit 202. It is.

  That is, in the first embodiment, the first optical element unit 201 on the viewer 20 side is provided with one optical element (first optical element 141), and the second optical element unit 202 on the background side has a plurality. In contrast to the optical elements (second optical element 142 and third optical element 143), as shown in FIG. 9, in the present embodiment, the first optical element unit 201 on the observer 20 side is provided in the first optical element unit 201. Is provided with one optical element (first optical element 341) close to the light transmission part 130, and the second optical element part 202 on the background side has three optical elements (second optical element 342, third optical element). An element 343 and a fourth optical element 344) are provided in contact with each other.

  The first optical element 341, the second optical element 342, the third optical element 343, and the fourth optical element 344 are arranged at a position overlapping the light transmission unit 130 when viewed from the front, similarly to the first embodiment. At the same time, they are arranged in a row so as to overlap each other. Also in the present embodiment, each of the first optical element 341, the second optical element 342, the third optical element 343, and the fourth optical element 344 has a predetermined focal point and a function of converging incident parallel rays. It is comprised by the spherical ball lens which has. The first optical element 341 and the second optical element 342 disposed at the position closest to the light transmission unit 130 are both configured so that the focal point is located in the light transmission unit 130.

  In the present embodiment also, the first optical element 341, the second optical element 342, the third optical element 343, and the fourth optical element 344 are configured to cover the light transmission unit 130 when viewed from the front. ing.

  As described above, according to the transparent display device 3 according to the present embodiment, the first optical element 341 and the second optical element 342 are arranged so as to sandwich the light transmission part 130 as in the first embodiment, and both are in focus. Is configured to be located in the light transmitting portion 130. As a result, the parallel light incident from one surface of the display panel 101 is focused at the light transmission unit 130 and is emitted from the other surface of the display panel 101.

  In the present embodiment, the third optical element 343 is provided outside the second optical element 342 so as to be in contact with the second optical element 342, and further, the fourth optical element is provided so as to be in contact with the third optical element 343. 344 is provided. With this configuration, as shown in FIG. 9, the parallel light beam 10 </ b> L reflected from the reflecting object 10 existing on the back side of the display panel 101 passes through the fourth optical element 344, the third optical element 343, and the second optical element 342. Then, the light is focused at the position of the light transmission part 130 of the display panel 101 and reaches the front side of the display panel 101 via the first optical element 341. Thereby, the observer 20 on the front side of the display panel 101 can visually recognize the transmission image 10 </ b> A coming from the back side of the display panel 101.

  As described above, also in the present embodiment, the transmission image 10A (parallel light beam 10L) that is transmitted through the display panel 101 is focused on the light transmission portion 130, so that the lattice shape of the first metal wiring 111 and the second metal wiring 112 is increased. The influence of diffraction due to can be eliminated. Therefore, it is possible to suppress blurring of the transmission image 10A that is transmitted through the display panel 101.

  Also in the present embodiment, since the fourth optical element 344 is provided, the observer 20 can visually recognize the transmitted image 10A transmitted through the display panel 101 as a normal image.

  Further, also in this embodiment, each optical element is configured to cover the light transmission part 130, so that even if the light transmission region of the light transmission part 130 is narrow, the transmission image coming from the background 10A can be brightened. Further, by narrowing the light transmission region of the light transmission unit 130, the transmitted image 10A can be made clearer.

(Embodiment 4)
Next, a transparent display device 4 according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 10 is a cross-sectional view of a transparent display device according to Embodiment 4 of the present invention.

  The transparent display device 4 according to this embodiment shown in FIG. 10 is different from the transparent display device 1 according to Embodiment 1 shown in FIG. 2B in the configuration of the first optical element and the third optical element.

  That is, in the first embodiment, the first optical element 141 and the third optical element 143 are configured by spherical spherical lenses, whereas in the present embodiment, the first optical element on the external side is formed. 441 and the third optical element 443 are constituted by Fresnel lenses.

  As in the first embodiment, the first optical element 441, the second optical element 142, and the third optical element 443 are arranged at a position that overlaps the light transmission unit 130 when viewed from the front, and at a position that overlaps each other. It is arranged in a row. Also in the present embodiment, each of the first optical element 441 and the second optical element 142 disposed at a position closest to the light transmission unit 130 is configured such that the focal point is located in the light transmission unit 130. Yes.

  Also in the present embodiment, the first optical element 441, the second optical element 142, and the third optical element 443 are configured to cover the light transmission portion 130 when viewed from the front.

  As described above, according to the transparent display device 4 according to the present embodiment, since the first optical element 141 and the second optical element 142 are arranged so as to sandwich the light transmission part 130 as in the first embodiment, The same effect as in the first embodiment can be obtained. That is, it is possible to suppress blurring of the transmission image 10A that is transmitted through the display panel 101.

  Furthermore, in the present embodiment, the first optical element unit 201 and the second optical element unit 202 can be made thin by using a fullnel lens as an optical element, so that the entire transparent display device 4 can be made thin. it can. In this embodiment, the optical element on the surface is a Fresnel lens. Thereby, the surface of the transparent display apparatus 4 can be planarized easily.

(Embodiment 5)
Next, the transparent display device 5 according to Embodiment 5 of the present invention will be described with reference to FIGS. 11A and 11B. FIG. 11A is an enlarged plan view of a transparent display device according to Embodiment 5 of the present invention, and FIG. 11B is a cross-sectional view of the transparent display device taken along line AA ′ of FIG. 11A.

  As shown in FIGS. 11A and 11B, the transparent display device 5 according to the present embodiment shields light from the first optical element 141 compared to the transparent display device 1 according to the first embodiment shown in FIGS. 2A and 2B. A film 500 is formed.

  As shown in FIGS. 11A and 11B, in the present embodiment, a light shielding film 500 having a predetermined shape is applied and formed on the surface portion of the first optical element 141 on the display panel 101 side. That is, the light shielding film 500 is formed on the surface of the first optical element 141 on the light transmission part 130 side.

  The light shielding film 500 is formed so as to shield light entering the first optical element 141 from the display element 120 and not shield the transmitted image 10A. As the light shielding film 500, a light shielding material such as a resin black material can be used.

  As described above, according to the transparent display device 5 according to the present embodiment, since the first optical element 141 and the second optical element 142 are disposed so as to sandwich the light transmitting portion 130, as in the first embodiment. The same effect as in the first embodiment can be obtained. That is, it is possible to suppress blurring of the transmission image 10A that is transmitted through the display panel 101.

  Furthermore, according to the transparent display device 5 according to the present embodiment, the following operational effects can be achieved with respect to the transparent display device 1 according to the first embodiment.

  Here, since the display image is displayed on the display panel 101 by the light from the display element 120, the observer 20 can visually recognize the display image by the display element 120. On the other hand, since the transmission image 10A of the reflective object 10 is transmitted from the light transmission unit 130 and reaches the observer 20 through the first optical element 141, the observer 20 can also visually recognize the transmission image 10A. That is, the light of the image of the display image and the light of the image of the transmission image 10A are incident on the eyes of the observer 20.

  However, as shown in FIG. 2B, in the transparent display device 1 according to Embodiment 1, not only the light of the transmission image 10A but also the light of the display image on the display element 120 is incident on the first optical element 141 as stray light. To do.

  On the other hand, in the present embodiment, the light shielding film 500 is formed on the first optical element 141. Accordingly, the light of the display image among the light incident on the first optical element 141 is shielded by the light shielding film 500, and only the light of the transmission image 10A is incident on the first optical element 141. That is, stray light other than the light of the reflecting object 10 cannot enter the first optical element 141.

  Thus, in the present embodiment, the light of the display image and the light of the transmission image 10A are separated by the light shielding film 500, and only the light of the transmission image 10A can be selectively incident on the first optical element 141. . Therefore, since the transmitted image 10A can be clearly reproduced, the observer 20 can visually recognize both the display image and the transmitted image clearly.

(Modification of Embodiment 5)
Next, a transparent display device 5A according to a modification of the fifth embodiment of the present invention will be described with reference to FIGS. 12A and 12B. 12A is an enlarged plan view of a transparent display device according to a modification of Embodiment 5 of the present invention, and FIG. 12B is a cross-sectional view of the transparent display device taken along line AA ′ in FIG. 12A.

  The transparent display device 5A according to this modification is different from the transparent display device 5 according to the fifth embodiment in the position of the light shielding film. That is, in Embodiment 5 described above, the light shielding film 500 is formed on the first optical element portion 201 (first optical element 141), whereas in the present modification, the light shielding film 500A is formed on the display panel 101. Forming.

  As shown in FIGS. 12A and 12B, in this modification, a light shielding film 500A having a predetermined shape is applied and formed on the surface (light emission side surface) of the display element 120. Also in this modification, the light shielding film 500A is formed so as to shield light entering the first optical element 141 from the display element 120 and not shield the transmitted image 10A. For the light shielding film 500A, a light shielding material such as a resin black material can be used.

  As described above, according to the transparent display device 5A according to the present modification, the first optical element 141 and the second optical element 142 are arranged so as to sandwich the light transmission part 130, as in the first embodiment. The effect similar to the form 1 of this can be show | played. That is, it is possible to suppress blurring of the transmission image 10A that is transmitted through the display panel 101.

  Furthermore, according to the transparent display device 5A according to the present modification example, since the light shielding film 500A is formed on the display element 120 as in the fifth embodiment, the display element out of the light incident on the first optical element 141 is formed. The light of the display image 120 is shielded by the light shielding film 500 </ b> A, and only the light of the transmission image 10 </ b> A enters the first optical element 141. Therefore, since the transmitted image 10A can be clearly reproduced, the observer 20 can visually recognize both the display image and the transmitted image clearly.

(Embodiment 6)
Next, the transparent display device 6 according to Embodiment 6 of the present invention will be described with reference to FIGS. 13A and 13B. FIG. 13A is an enlarged plan view of a transparent display device according to Embodiment 6 of the present invention, and FIG. 13B is a cross-sectional view of the transparent display device taken along line AA ′ of FIG. 13A.

  As shown in FIGS. 13A and 13B, the transparent display device 6 according to the present embodiment is located on the front side of the display element 120 with respect to the transparent display device 1 according to the first embodiment shown in FIGS. 2A and 2B. A convex lens 600 is arranged. The convex lens 600 is configured to collect light emitted from the display element 120. In the present embodiment, the convex lens 600 has a diameter of about 48 μm.

  In the present embodiment, the first metal wiring 111 and the second metal wiring 112 are formed wider than the first embodiment. In the present embodiment, the first metal wiring 111 and the second metal wiring 112 both have a line width of about 60 μm. Each of the display elements 120 has a rectangular shape (planar view shape) having a vertical dimension of 30 μm and a horizontal dimension of 30 μm. Furthermore, the planar view shape of each light transmission part 130 is a square with a side of 20 μm.

  Also in the present embodiment, the first optical element 141, the second optical element 142, and the third optical element 143 are configured to cover the light transmission portion 130 when viewed from the front, and each spherical lens. The diameter D is configured to be larger than the length of the diagonal line L of the light transmission part 130. In the present embodiment, the diameter D of each spherical lens is about 48 μm, and the diagonal line L of the light transmitting portion 130 is about 28 μm.

  As described above, according to the transparent display device 6 according to the present embodiment, since the first optical element 141 and the second optical element 142 are arranged so as to sandwich the light transmission part 130 as in the first embodiment, The same effect as in the first embodiment can be obtained. That is, it is possible to suppress blurring of the transmission image 10A that is transmitted through the display panel 101.

  Further, in the present embodiment, since the convex lens 600 is provided on the front side of the display element 120, the emitted light from the display element 120 is collected by the convex lens 600 and emitted to the front of the display panel 101. Thereby, the stray light of the display image on the display element 120 does not enter the first optical element 141, and only the light of the transmission image 10A enters. Therefore, the transmitted image 10A can be reproduced clearly. In addition, in the present embodiment, since the light of the display image 30 is collected by the convex lens 600, the luminance of the display image 30 can be improved. Thereby, the display image 30 can be reproduced clearly. As described above, in the present embodiment, the light of the display image 30 and the light of the transmission image 10A are separated by the convex lens 600 without causing stray light. The display image 30 and the transmission image 10A can be visually recognized clearly.

  As described above, the transparent display device according to the present invention has been described based on the embodiments and the modified examples. However, the present invention is not limited to the above-described embodiments and modified examples.

  For example, in the above embodiment, the first optical element, the second optical element, the third optical element, and the like are formed separately for each optical element and configured by a spherical lens. However, the present invention is not limited to this. As a 1st optical element, a 2nd optical element, a 3rd optical element, etc., as shown to FIG. 14A and FIG. 14B, it does not matter as an integrally molded optical member. FIG. 14A is a plan view showing an example of an optical member in a transparent display device according to a modification of the embodiment of the present invention. FIG. 14B is a sectional view of the optical member taken along line B-B ′ of FIG. 14A. As shown in FIGS. 14A and 14B, the first optical element, the second optical element, the third optical element, and the like can be integrally formed to form a lens sheet 700. The lens sheet 700 includes a lens unit 701 and a sheet unit 702. The lens unit 701 has the same function as each optical element such as the first optical element, the second optical element, and the third optical element. The sheet part 702 is a base material that supports the lens part 701. By using such a lens sheet 700, the display panel 101 and the first optical element unit 201 (second optical element unit 202) can be separately manufactured. Further, by using a plurality of lens sheets 700 in a stacked manner, the second optical element portion 202 shown in FIG. 2B or FIG. 9 can be easily configured. As a material for the lens sheet 700, a transparent plastic such as epoxy or a transparent rubber such as silicone resin can be used. In addition, as an integral molding method, there is a method of solidifying after forming a mold, pressurizing and heating to liquefy it.

  In the above-described embodiment, the first optical element, the second optical element, the third optical element, and the like are spherical lenses, but are not limited thereto. As the first optical element, the second optical element, the third optical element, and the like, other optical members having a similar function such as a convex lens can be used. The number and arrangement of the optical elements in the first optical element unit 201 and the second optical element unit 202 are not limited to the above embodiment.

  In Embodiment 1 and the like described above, the third optical element 143 is used in addition to the first optical element 141 and the second optical element 142, but the transmitted image may be a reverse image instead of a normal image. The third optical element 143 may not be provided. In other words, it may be configured by only two optical elements, the first optical element 341 and the second optical element 342, which are arranged so as to sandwich the light transmission part 130.

  In the above embodiment, when an organic EL element is used as the display element, the first conductive layer 123a as the lower electrode is a reflective electrode, but the present invention is not limited to this. For example, the first conductive layer 123a as well as the second conductive layer 123e can be made of a transparent material such as ITO. Thereby, since a display image can be displayed on both the front side and the back side of the display panel 101, a transparent display device capable of double-sided display can be realized.

  In the above embodiment, the display image of the display element 120 may be either a single color display image or a color display image. In the case of a color display image, a light emitting layer may be formed by color-coding with phosphors that emit red, green, and blue, and display elements corresponding to the colors may be provided. In this case, red, green, and blue light emitting layers may be stacked. Alternatively, it is also possible to display a color display image using a color filter or a color conversion filter after a display element having a light emitting layer of a single color or two colors is manufactured.

  In addition, the form obtained by making various modifications conceived by those skilled in the art with respect to each embodiment and modification, and the components and functions in each embodiment and modification are arbitrarily set within the scope of the present invention. Forms realized by combining them are also included in the present invention.

  Since the transparent display device according to the present invention can suppress blurring of a transmission image, it is useful in a transparent display device that can display a large display image with high definition.

1, 1A, 1B, 1C, 2, 3, 4, 5, 5A, 6, 1000 Transparent display device 10 Reflective object 10L Parallel light 10A Transmission image 20 Observer 30 Display image 101 Display panel 110 Metal wiring part 111 First metal Wiring 112 Second metal wiring 120, 120A, 120B, 120C Display element 121 TFT substrate 122 Planarization film 122PX Pixel 122GL Scan line 122DL Data line 122PL Power supply line 122Dr Driving transistor 122 Sw Switch transistor 122C Capacitor 123 Organic EL element 123a First 1 conductive layer 123b hole injection / transport layer 123c, 154, 1120 light emitting layer 123d electron injection / transport layer 123e second conductive layer 130 light transmission part 141, 241, 341, 441 first optical element 14 242 342 Second optical element 143 243 343 443 Third optical element 201 First optical element part 202 Second optical element part 151 Substrate 152 First electrode 153 First insulating layer 155 Second insulating layer 156 Second electrode 344 Fourth optical element 500, 500A Light-shielding film 600 Convex lens 700 Lens sheet 701 Lens portion 702 Sheet portion 1100 EL panel 1111, 1112 Transparent wiring 1130, 1140 Transparent substrate 1200 Liquid crystal light control sheet 1300 Adhesive region

Claims (11)

A plurality of metal wirings arranged in a matrix, a display element to which a signal for displaying a display image is supplied from the metal wiring, and a plurality of light transmission portions corresponding to a region between the adjacent metal wirings A display panel having
A first optical element provided on either the front side or the back side of the display panel;
A second optical element provided on either the front side or the back side of the display panel,
In the first optical element and the second optical element, parallel light incident from one of the front side and the back side of the display panel is focused on the light transmission portion, and either the front side or the back side of the display panel is selected. A transparent display device configured to emit light as parallel light from the other side. The display element includes a pair of electrodes and a light emitting layer sandwiched between the pair of electrodes,
The transparent display device according to claim 1, wherein the light emitting layer emits light according to a signal supplied from the metal wiring. The transparent display device according to claim 2, wherein the light emitting layer is disposed on the light transmission portion. The transparent display device according to claim 2, wherein the light emitting layer is disposed on an intersecting portion where the plurality of metal wirings intersect. The transparent display device according to claim 1, wherein the first optical element and the second optical element cover the light transmission part. The first optical element and the second optical element are lenses,
The shape of the light transmission part is a rectangular shape when viewed from the one surface side or the other surface side of the display panel,
The transparent display device according to claim 5, wherein a diameter of the lens is larger than a diagonal length of the light transmission part. The transparent display device according to claim 5, wherein the first optical element or the second optical element has a light shielding film formed on a surface on the light transmission part side. Furthermore, it has a convex lens arrange | positioned in front of the said display element part. The transparent display apparatus of any one of Claims 5-7. And a third optical element adjacent to the second optical element,
The first optical element, the second optical element, and the third optical element are arranged in a row with the light transmission portion interposed therebetween,
The first optical element, the second optical element, and the third optical element are configured by a spherical lens.
The transparent display apparatus of any one of Claims 1-8. The transparent display device according to claim 1, wherein at least one of the first optical element and the second optical element is a Fresnel lens. The transparent display device according to claim 1, wherein each of the first optical element and the second optical element is integrally molded.

Images