JP2008159309A - Light emitting device, its manufacturing method, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device capable of enhancing luminance while suppressing occurrence of a dark spot caused by short-circuiting of an electrode and electric field concentration. <P>SOLUTION: This light emitting device is equipped with a substrate 10 bent so as to form a corrugated shape, and an element forming layer 11 provided along the corrugated shape of the substrate 10. The element forming layer 11 includes an organic EL element 12 formed by laminating a hole injection layer 15, a hole transport layer 16, a luminescent layer 17, an electron transporting layer 18, and a cathode electrode layer 19 on an anode electrode layer 14 in this order. Thereby, a light emitting area is increased, and short-circuiting of the electrode and electric field concentration caused when the thickness of the organic EL element 12 is uneven are effectively suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention particularly relates to a light emitting device used as a backlight of a liquid crystal display device, a manufacturing method thereof, and a display device.

  In recent years, a liquid crystal display (LCD) is often used as a display monitor for liquid crystal televisions, notebook computers, car navigation systems, and the like. The liquid crystal display has a liquid crystal layer sealed between panel substrates, and performs various displays by modulating light transmitted through the liquid crystal layer based on image data. However, since such a liquid crystal display is not self-luminous, an external light source such as a backlight is required for image display.

  Backlights are mainly classified into direct type, edge light type, and flat light source type, and the flat light source type is ideal particularly for thin display applications. The direct type is a surface light source by placing a fluorescent lamp and a reflective film directly behind the LCD panel, so that high luminance can be obtained with high luminous efficiency. However, as the TV monitor becomes larger, the fluorescent lamp is the light source. This increases the number of pieces and increases the weight. Further, in order to conceal the arrangement of the fluorescent lamps and make a uniform surface light source, a sufficient depth of about 20 to 40 mm is necessary, which is the biggest factor that hinders the reduction in thickness. Since the edge light type is a surface light source by placing a fluorescent lamp on the side surface of the light guide plate, although it is thin, the luminance is relatively small, and the entire device becomes very heavy because the light guide plate is used.

  As the planar light source type backlight, an organic EL backlight using an organic EL (EL) element, a planar fluorescent lamp, or the like is used. Among them, the organic EL backlight greatly reduces power consumption, has few members, and does not require an inverter, and thus is advantageous for reduction in thickness and weight. However, since this organic EL backlight actually has a low luminance, improvement in luminance is desired for practical use particularly in television applications.

Therefore, Patent Documents 1 and 2 disclose organic EL backlights in which the display luminance is improved by increasing the light emitting area by forming organic EL elements on a substrate having an uneven shape. For example, as shown in FIG. 9, this organic EL backlight is obtained by laminating an organic EL layer 201 including a light emitting layer on a substrate 200 having a corrugated uneven shape. After forming the concavo-convex shape by lithography or the like, the organic EL layer 201 is formed thereon by vapor deposition or the like.
JP 2004-126074 A JP-A-2-79022

  However, in Patent Documents 1 and 2, since the surface of the substrate 200 on which the organic EL layer 201 is deposited is not flat, it is difficult to form the organic EL layer 201 with a uniform thickness. Since the organic EL layer 201 is a very thin layer of several tens of nanometers, there is a problem that dark spots are likely to occur due to short-circuiting of electrodes or concentration of electric field when the thickness is not uniform.

  The present invention has been made in view of such problems, and the object thereof is to provide a light-emitting device capable of improving luminance while suppressing the occurrence of dark spots due to short-circuiting of electrodes or electric field concentration, and a method for manufacturing the same, and It is to provide a display device.

  A light emitting device according to the present invention includes a substrate bent so that a cross section thereof has a corrugated shape, and a light emitting element provided on one surface side of the substrate along the corrugated shape of the substrate. .

  A method for manufacturing a light emitting device according to the present invention includes a step of forming a light emitting element on one surface of a flexible substrate, a step of bending the substrate on which the light emitting element is formed, and a shape of the substrate bent in a wave shape. And a step of fixing in a bent state.

  A display device according to the present invention is a display device that includes a display panel that is driven based on image data, and a light-emitting device that is provided on the opposite side of the display surface of the display panel. The substrate includes a substrate bent so as to have a corrugated shape, and a light emitting element provided on one surface of the substrate along the corrugated shape.

  However, in the present invention, the “wave shape” is a wave-like shape formed by alternately arranging convex portions and concave portions, and has a periodic structure in which the period and amplitude are strictly defined. It is not limited. Similarly, the “wavy” is a wave-like state formed by alternately arranging convex portions and concave portions. Further, the “period equivalent interval” corresponds to a wave period, and specifically refers to an interval in the wave traveling direction between the apexes of adjacent convex portions (or concave portions) in the corrugated shape. . The “amplitude-corresponding interval” corresponds to the amplitude of the wave, and specifically refers to the interval in the direction perpendicular to the wave traveling direction between the apex of the adjacent convex portion and the apex of the concave portion in the corrugated shape. Shall.

  In the light emitting device according to the present invention, a light emitting element is provided along the corrugated shape on one surface of the substrate bent so that the cross section has a corrugated shape. Short-circuiting of electrodes and electric field concentration that occur when the thickness of the element is not uniform are suppressed.

  In the method for manufacturing a light emitting device according to the present invention, after forming a light emitting element on a flexible substrate, it is bent into a wave shape, and the shape is fixed in the bent state, whereby convex portions and concave portions are alternately arranged. A light emitting element is formed with a constant thickness along the wave shape of the substrate. As a result, the light emitting area is increased, and the short circuit of the electrode and the electric field concentration that occur when the thickness of the light emitting element is not uniform are suppressed.

  In the display device according to the present invention, the light emitting device provided on the opposite side of the display surface of the display panel emits light along the corrugated shape on one surface of the substrate bent so that the cross section has the corrugated shape. By providing the element, a local dark field is suppressed and display luminance is improved.

  According to the light emitting device of the present invention, the substrate is bent so that the cross section has a corrugated shape, and the light emitting element provided along the corrugated shape of the substrate on one surface side of the substrate. Therefore, it is possible to improve the luminance while suppressing the generation of dark spots due to the short circuit of the electrodes and the electric field concentration.

  According to the method for manufacturing a light emitting device according to the present invention, a step of forming a light emitting element on a flexible substrate, a step of bending the substrate on which the light emitting element is formed, and a shape of the substrate bent in a wave shape are And the step of fixing in a bent state. Therefore, it is possible to manufacture a light-emitting device capable of improving luminance while suppressing generation of dark spots due to short-circuiting of electrodes or concentration of electric field.

  According to the display device of the present invention, the display device includes a display panel that is driven based on image data, and a light emitting device that is provided on the opposite side of the display surface of the display panel. Since the substrate is bent so that the cross section has a corrugated shape and the light emitting element provided along the corrugated shape is provided on one surface of the substrate, display unevenness is suppressed and a bright image display is provided. It can be performed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a light emitting device (hereinafter referred to as a light emitting device 1) according to an embodiment of the present invention. The light emitting device 1 has a wave-like shape as a whole, and has a laminated structure in which an element forming layer 11 is provided on one surface of a substrate 10. FIG. 2 shows an enlarged view of a cross section of the light emitting device 1. The light emitting device 1 emits light emitted from the element forming layer 11 as light L from the substrate 10 side, and a surface of the substrate 10 not facing the element forming layer 11 is a light emitting surface I.

  The wave shape of the light emitting device 1 is such that convex portions and concave portions are alternately arranged in one direction within the substrate surface. FIG. 3 shows a schematic diagram of this corrugated shape. This corrugated shape includes an interval w in the wave traveling direction between the apexes T of the adjacent convex portions 100 or apexes B of the adjacent concave portions 101 (hereinafter referred to as a “period equivalent interval” of the waves), and a convex portion. The shape is determined by an interval d (hereinafter referred to as an “amplitude-equivalent interval”) d between 100 and the recess 101 in a direction perpendicular to the wave traveling direction. In the following, the unit of the period equivalent interval w and the amplitude equivalent interval d is mm (millimeter).

  The period-equivalent interval w determines the arrangement density of the convex portions 100 (or the concave portions 101) on the substrate surface, and preferably w> 2.0. This period-equivalent interval w may be constant within the substrate surface or may be different for each region.

  The amplitude-corresponding interval d contributes to the thickness of the light-emitting device 1, and preferably d> 0.5, more preferably 0.5 <d <30.

  The substrate 10 is made of a transparent substrate, for example, a plastic substrate such as polyimide, and has a constant thickness, for example, 200 μm. The substrate 10 supports the element forming layer 11 and has a light emitting surface I, and transmits the emitted light to emit light L.

  The element forming layer 11 is a layer on which a light emitting element, for example, an organic EL element, an inorganic EL element, a semiconductor light emitting element, or the like is formed. FIG. 4 shows an example of the cross-sectional configuration. The element forming layer 11 includes, for example, an organic EL element 12 and a barrier layer 20 provided so as to cover the organic EL element 12 on the barrier layer 13. In the organic EL element 12, a hole injection layer 15, a hole transport layer 16, a light emitting layer 17, an electron transport layer 18, and a cathode electrode layer 19 are laminated on the anode electrode layer 14 in this order.

  The light emitting layer 17 is formed by laminating layers (not shown) that emit light of three colors of red (R), green (G), and blue (B) using an organic EL phenomenon. By combining (superimposing) these three colors of light, white light is generated as a whole. The light emitting layer 17 is made of an organic material such as a metal complex, a low molecular fluorescent dye, or a fluorescent polymer.

  The anode electrode layer 14 has a function of driving the light emitting layer 17 and transmitting light emitted from the light emitting layer 17 to the substrate 10 side, and has a transparent electrode such as ITO (indium tin oxide). It is comprised by.

  The cathode electrode layer 19 has a function of driving the light emitting layer 17 and reflecting light emitted from the light emitting layer 17, and has a high reflectivity for visible light, such as aluminum (Al), silver (Ag). ) Or an alloy of these.

  The hole injection layer 15 injects holes into the hole transport layer 16. The hole transport layer 16 transports holes injected from the hole injection layer 15 to the light emitting layer 17. The electron transport layer 18 transports electrons to the light emitting layer 17. These layers are provided in order to improve the light emission efficiency in the light emitting layer 17, and both are made of an organic material.

  The barrier layers 13 and 20 are formed by sealing the organic EL element 12, in particular, a layer made of an organic material such as the hole injection layer 15, the hole transport layer 16, the light emitting layer 17, and the electron transport layer 18. It has a function to protect against moisture and oxygen. The barrier layer 13 is also provided on the substrate 10 side because polyimide or the like used as the material of the substrate 10 is porous and has a property of easily adsorbing moisture. The barrier layers 13 and 20 are made of an inorganic material such as silicon nitride (SiN) or silicon monoxide (SiO).

  In addition, a connecting portion 30 is provided in an intermediate portion of the corrugated shape corresponding to the amplitude d, that is, in an intermediate region between the apex of the adjacent convex portion and the concave portion of the corrugated shape. The connecting portion 30 connects a plurality of sub-boards. The connection part 30 is comprised with the transparent adhesive agent, the transparent adhesive tape, etc., for example. Moreover, the structure by which the some sub board | substrate connected by the connection part 30 was provided on the large-sized plastic substrate of the same material as a sub board | substrate may be sufficient.

  Furthermore, as shown in FIG. 5, the resin layer 40 may be provided on the front and back of the light emitting device 1. The resin layer 40 is made of a resin having transparency, and preferably has a low hygroscopic property such as an epoxy resin or a fluororesin. A container 100 may be provided on the surface of the resin layer 40. The container 100 is made of a transparent material such as glass or acrylic. The resin layer 40 may be provided only on one of the front surface and the back surface of the light emitting device 1.

    Next, a method for manufacturing the light-emitting device 1 as a method for manufacturing the light-emitting device according to the present embodiment will be described.

  First, after forming the barrier layer 13 on one surface of the substrate 10, the anode electrode layer 14, the hole injection layer 15, the hole transport layer 16, the light emitting layer 17, the electron transport layer 18, and the cathode electrode layer are formed on the barrier layer 13. The organic EL element 12 is formed by providing 19 in this order using, for example, a vapor deposition method or the like. At this time, a flexible substrate having flexibility is used as the substrate 10, and each layer of the organic EL element 12 is deposited in a state where the substrate 10 is flat. Next, these layers are sealed with a barrier layer 20 to form a plurality of flexible devices having the element structure shown in FIG.

  Next, the plurality of flexible devices formed in this way are each bent so as to have a wave shape with a desired period-equivalent interval w and amplitude-equivalent interval d. Subsequently, a plurality of sub-substrates are formed by fixing the flexible device in the bent state. Thereafter, the plurality of sub-boards are connected to each other through the connecting portion 30. Alternatively, a plurality of flexible devices may be connected in a flat state, and then bent into a corrugated shape and fixed. For example, the sub-boards may be attached to a large-sized board made of the same material as the sub-board with a transparent adhesive so as not to leave a gap, and then bent into a corrugated shape. At this time, it is preferable that the connecting portion 30 is disposed at an intermediate portion of the corrugated shape corresponding to the amplitude d. Thereby, the light-emitting device 1 shown in FIG. 1 is completed.

  When the flexible device is fixed to the corrugated shape, for example, the flexible device bent into the corrugated shape is put into the container 100, and the gap between the flexible device and the container 100 is filled with a curable resin. The curable resin is cured to form the resin layer 40 (FIG. 5). In addition, since the organic EL element 12 is weak to ultraviolet light, it is preferable to use what has thermosetting rather than photocuring as curable resin. Alternatively, the curable resin may be filled into only one side of the flexible device in the container 100, and the resin layer 40 may be formed and fixed only on either the front surface or the back surface of the flexible device. The container 100 may be removed after the resin layer 40 is formed.

  FIG. 6 is a schematic cross-sectional view of the display device according to the present embodiment. This display device includes a liquid crystal display panel 2 and a light emitting device (light emitting device 1) according to the present embodiment that irradiates the liquid crystal display panel 2 with light on the side opposite to the display surface of the liquid crystal display panel 2. . The liquid crystal display panel 2 is disposed so as to face a TFT substrate 50 provided with, for example, a pixel electrode, a TFT (Thin Film Transistor) switching element (not shown), and the TFT substrate 50. And a CF substrate 52 provided with a color filter or the like (not shown), and a liquid crystal layer 51 provided between the TFT substrate 50 and the CF substrate 52. Further, on the front and back of the liquid crystal display panel 2, there are provided polarizing plates 53a and 53b that allow only light that vibrates in a certain direction to pass therethrough. In this display device, the light emitting device 1 functions as a flat backlight, and the liquid crystal display based on the image data is performed on the surface side of the CF substrate 52 using the light L emitted from the light emitting device 1.

  Next, operations and effects of the light emitting device and the light emitting device as described above, and the display device will be described.

  In the light emitting device of the present embodiment, when a driving voltage is applied between the anode electrode layer 14 and the cathode electrode layer 19, the hole injection layer 15 and the hole transport layer 16 are formed in the light emitting layer 17 of the organic EL element 12. White light is generated by recombination of the holes supplied via and the electrons supplied from the electron transport layer 18. The white light is reflected by the cathode electrode layer 19 or directly passes through the barrier layer 13 and the substrate 10 and is emitted as light L from the back surface (light emitting surface I) of the substrate 10.

  At this time, the light emitting surface I has a corrugated shape in which convex portions and concave portions are alternately arranged, so that the same plane area is obtained as compared with the case where the light emitting surface is a flat surface. However, the emission area can be increased. Thereby, a brightness | luminance can be improved. Further, since the organic EL element 12 in the element forming layer 11 is provided with a constant thickness along the corrugated shape, it is caused by a short circuit of an electrode or an electric field concentration that occurs when the element layer has a locally different thickness. Generation of dark spots can be suppressed.

  Here, in the conventional example (Patent Document 1), the light emission area S is calculated. At this time, the cross section of one convex portion 202 shown in FIG. 9 is approximated to a triangle having apexes A, B, and C, and the apex C is a right angle, and the length of the side CA and the length of the side BC are Calculate the sum (CA + BC). This is the light emission area S ′ of Patent Document 1 when the light emission area (the length of the side AB) on a flat surface having no unevenness is 1.

Specifically, it is calculated using the three-square theorem, equation (1). Moreover, Formula (1) can be deform | transformed like Formula (2). Furthermore, when ∠CAB is α and ∠CBA is β, CA = ABcosα and BC = ABcosβ, which can be expressed as shown in Expression (3). This leads to equation (4).
CA ² + BC ² = AB ² (1)
AB ² = (CA + BC) ² −2 CA · BC (2)
CA + BC = (AB ² + 2ABcos α · ABcos β) ^1/2 (3)
S ′ = AB (1 + 2 cos α · cos β) ^1/2 (4)

  As described above, as shown in FIG. 10, the light emission area S ′ in the conventional example is the maximum when α = 45 ° (β = 45 °), and the maximum value is 1.4.

On the other hand, in the light emitting device of the present embodiment, the light emitting area S is determined by the ratio of the size of the corrugated period equivalent interval w and the amplitude equivalent interval d. For example, when w: d = 1: 0.5, the emission area is π / 2, when w: d = 1: 1, when the emission area S is π / 2 + 1, and w: d = 1: 1.5. The light emission area S can be approximated to π / 2 + 2. Thus, the light emission area S can be expressed as in Expression (5). However, w: d = 1: y.
S = π / 2 + 2 · (y−1 / 2) (5)

  Therefore, for example, when the period equivalent interval w is 5.0 mm and the amplitude equivalent interval d is 5.0 mm, the light emission area is 2.57. When the period equivalent interval w is 5.0 mm and the amplitude equivalent interval d is 20 mm, the light emission area is 8.57. Therefore, a larger light emitting area can be ensured as compared with the conventional configuration.

  Further, the light emission area can be increased as much as possible by reducing the period equivalent interval w and increasing the amplitude equivalent interval d. However, from the viewpoint of manufacturability, it is preferable that the period equivalent interval w is larger than 2.0 mm and the amplitude equivalent interval d is larger than 0.5 mm. Further, the amplitude equivalent interval d is set to 30 mm or less, which is advantageous for thinning the apparatus.

  Further, by using the organic EL element 12 utilizing the organic EL phenomenon as a light emitting element, it is possible to significantly reduce power consumption as compared with a case where a fluorescent lamp or the like that is usually used frequently is used.

  Further, since the connecting portion 30 for connecting the sub-boards is provided in the middle portion of the corrugated shape corresponding to the amplitude d, the connecting portion 30 is provided near the apex of the corrugated convex portion or the concave portion. Compared with the case where it is, the brightness nonuniformity can be suppressed. Since the light emitting element is not formed in the connection part 30, the brightness | luminance falls in the direct upper vicinity. Here, in the corrugated shape, the light emitted from the vicinity of the apex of the convex part (or concave part) is emitted directly upward of the apparatus without being reflected or diffused. On the other hand, the light emitted from the middle part of the amplitude equivalent interval d is reflected and diffused on the side walls of the convex part and the concave part and then emitted upward of the apparatus. For this reason, when the connection part 30 is provided in the vicinity of the apex of the corrugated convex part or the concave part, a dark part locally occurs due to the connection part 30. On the other hand, when the connection part 30 is provided in the intermediate part of the amplitude equivalent interval d away from the vicinity of the apex of the convex part or the concave part, the luminance is dispersed, so that the occurrence of luminance unevenness is suppressed as a whole device. be able to.

  In the method of manufacturing the light emitting device according to the present embodiment, after forming and sealing the organic EL element 12 on the flexible substrate 10 in a flat state, a wave shape with a desired period equivalent interval w and amplitude equivalent interval d is obtained. The light emitting area is increased by bending and fixing to a shape. At the same time, the thickness of the organic EL element 12 can be uniformly formed as compared with the conventional case where the element is formed on the uneven surface of the substrate. Therefore, a light-emitting device capable of improving luminance while suppressing generation of dark spots due to electrode short-circuiting or electric field concentration can be manufactured.

  Further, when fixing the corrugated shape, the front and back of the apparatus are hardened by the resin layer 40, so that the desired corrugated shape can be easily maintained and the organic EL element 12 can be protected from moisture and the like.

  In the display device of the present embodiment, when a driving voltage is applied between the TFT 50 substrate and the CF substrate 52 based on the image data, the light L emitted from the light emitting device 1 to the display panel 2 side is liquid crystal. Various displays are performed by being transmitted and modulated in the layer 51. At this time, the light-emitting device 1 includes a substrate 10 bent so as to have a corrugated shape, and a light-emitting element provided along the corrugated shape of the substrate 10, thereby suppressing dark field. In addition, bright image display can be performed.

  Further, in the light emitting device 1, since the light L is diffusely reflected in the traveling direction of the corrugated wave, the viewing angle characteristics in this direction are improved. Therefore, the viewing angle characteristic is improved in a desired direction by installing the light emitting device 1 so that the direction in which the viewing angle in the display panel 2 is required is the same as the traveling direction of the wave of the wave shape. be able to. For example, when it is desired to improve the viewing angle characteristics in the left-right direction of the display panel 2, the light-emitting device 1 may be installed so that the left-right direction matches the traveling direction of the wave of the wave shape. .

  Hereinafter, modifications of the present embodiment will be described.

(Modification 1)
FIG. 7 is a schematic diagram of a corrugated shape for explaining a light-emitting device according to Modification 1 of the present embodiment. The light emitting device of Modification 1 is the same as the above embodiment except for the configuration corresponding to the period equivalent interval w for determining the waveform shape. Therefore, only the configuration, operation, and effects different from the above embodiment will be described.

The corrugated shape of this light-emitting device has a period-equivalent interval w that varies depending on the region in the substrate surface. Specifically, the period equivalent interval w (w ₁ ) of the central portion A in the substrate surface is smaller than the period equivalent interval w (w ₂ ) of the peripheral portion B (w ₁ <w ₂ ). That is, the corrugated convex portion (concave portion) is “dense” in the central portion A, and the corrugated convex portion (concave portion) is “sparse” in the peripheral portion B. In general, a voltage drop is likely to occur in the central part A, so that there is a problem that the luminance is reduced as compared with the peripheral part B. On the other hand, since the light emitting area can be made larger in the central portion A than in the peripheral portion B by adopting the configuration as in the present modification, the reduction in luminance due to the voltage drop generated in the central portion A is compensated. As a result, the entire apparatus can maintain uniform brightness.

(Modification 2)
FIG. 8 is a cross-sectional view illustrating an element structure of a light emitting device according to Modification 2 of the present embodiment. The light emitting device according to the modification has the same configuration as that described above except that the element forming layer 21 provided on one surface of the substrate 10 has a different configuration for sealing the organic EL element 12. Therefore, the same components as those described above are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the element formation layer 21, the organic EL element 12 includes a barrier layer 13 on the substrate 10, a barrier layer 22 provided to face the barrier layer 13, and a seal portion provided between the barrier layer 13 and the barrier layer 22. 24 and sealed. A substrate 23 is provided on the barrier layer 22. The barrier layer 22 is made of the same material as that of the barrier layer 13. The substrate 23 is made of, for example, a metal such as aluminum (Al) and has a thickness of, for example, 100 μm. The seal portion 24 is made of an adhesive material having a low hygroscopic property such as an epoxy resin.

  Such an element formation layer 21 is produced as follows, for example. First, the barrier layer 13 and the organic EL element 12 are formed on the substrate 10, while the barrier layer 22 is formed on the substrate 23. Next, the substrate 10 and the substrate 23 are bonded together via the seal portion 24 so that the organic EL device 12 and the barrier layer 22 face each other, and then the seal portion 24 is cured, whereby the organic EL device 12 is formed. Seal. At this time, a metal substrate having a thickness that can be bent is used as the substrate 23. Thereby, a flexible device having the element structure shown in FIG. 8 can be formed.

  While the present invention has been described with reference to the embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the organic EL element 12 is used as the light emitting element formed in the element forming layer 11, but the present invention is not limited to this, and can be applied to an inorganic EL element, a semiconductor light emitting element, or the like. . In addition, the stacked structure of the organic EL element 12 is not limited to the above structure as long as the light emitting layer 17 can generate white light.

  The corrugated shape is a shape in which semicircular convex portions and concave portions are arranged. However, the shape is not limited to such a shape. Even if the shape of the portion or the recess is a cross section such as a rectangular shape or a triangular shape, the same effect as described above can be obtained. In addition, although the connection part 30 is provided in the region of the corrugated side surface, the connection part 30 may not be provided, and the element formation layer 11 may be provided on a single substrate 10. After forming, a light emitting device may be used that is bent and fixed in a corrugated shape.

It is a perspective view showing the structure of the light-emitting device which concerns on one embodiment of this invention. It is a cross-sectional enlarged view of the light-emitting device shown in FIG. It is a figure for demonstrating the waveform shape of the light-emitting device shown in FIG. It is sectional drawing showing the element structure of the light-emitting device shown in FIG. FIG. 6 is a perspective view illustrating another configuration example of the light emitting device illustrated in FIG. 1. It is sectional drawing showing the structure of the display apparatus which concerns on one embodiment of this invention. It is a schematic diagram for demonstrating the waveform shape of the light-emitting device which concerns on the modification 1 of this Embodiment. It is sectional drawing showing the element structure of the light-emitting device which concerns on the modification 2 of this Embodiment. It is sectional drawing showing the structure of the light-emitting device which concerns on a prior art example. It is a characteristic view showing the light emission area of the light-emitting device shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light-emitting device, 2 ... Display panel 10, 23 ... Board | substrate, 11 ... Element formation layer, 12 ... Organic EL element, 14 ... Anode electrode layer, 15 ... Hole injection layer, 16 ... Hole transport layer, 17 ... Light emitting layer , 18 ... electron transport layer, 19 ... cathode electrode layer, 13, 20, 22 ... barrier layer, 24 ... seal part, 30 ... coupling part, 40 ... resin layer 40 ... TFT substrate, 51 ... liquid crystal layer, 52 ... CF substrate 53a, 53b ... polarizing plate, 100 ... convex portion, 101 ... concave portion.

Claims (11)

A substrate bent so that the cross section has a corrugated shape;
A light emitting device comprising: a light emitting element provided on one surface of the substrate along a corrugated shape of the substrate. The light emitting device according to claim 1, wherein a resin layer is provided on at least one side of the substrate. The light emitting device according to claim 1, wherein the interval corresponding to the period of the corrugated shape is different for each region in the substrate surface. The light emitting device according to claim 1, wherein the interval corresponding to the period of the corrugated shape is smaller in the central portion than in the peripheral portion in the substrate surface. The light emitting device according to claim 1, wherein the interval corresponding to the period of the corrugated shape is greater than 2.0 mm. The light emitting device according to claim 1, wherein an interval corresponding to an amplitude of the corrugated shape is greater than 0.5 mm. The substrate includes a plurality of sub-substrates connected along a traveling direction of the corrugated wave;
The light emitting device according to claim 1, wherein a connecting portion that connects adjacent sub-boards is provided at an intermediate portion of the corrugated shape corresponding to an amplitude. The light emitting device according to claim 1, wherein the light emitting element is an organic EL (EL) element. Forming a light emitting element on one surface of a flexible substrate;
Bending the substrate on which the light emitting element is formed into a wave shape;
And a step of fixing the bent shape of the substrate in the bent state. The method for manufacturing a light-emitting device according to claim 8, wherein the shape of the substrate bent in a wave shape is fixed by forming a resin layer on at least one surface side of the substrate. A display device comprising: a display panel driven based on image data; and a light emitting device provided on the opposite side of the display surface of the display panel,
The light-emitting device includes a substrate bent so that a cross-section has a corrugated shape, and a light-emitting element provided along the corrugated shape on one surface side of the substrate.

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