JP2010219007A - Lighting device, display and electronic equipment equipped with display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device that suppresses deterioration in luminance without having unevenness occur in light emitted to an observer's side. <P>SOLUTION: This lighting device 10 includes: an organic EL element 2 provided as a light source; a first surface 1c arranged on a light emitting side of the organic EL element 2 and on the side facing the organic EL element 2; a glass substrate 1a having a second surface 1d on the opposite side of the first surface 1c; an indented shape section 1e provided on the first surface side 1c of the glass substrate 1a for dispersing the emitted light from the organic EL element 2; and a resin layer 4 provided to cover the indented shape section 1e and having a refractive index that is different from the indented shape section 1e. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting device, a display device, and an electronic device including the display device, and particularly relates to a lighting device, a display device, and an electronic device including a light emitting element portion.

  Conventionally, a display device including a light emitting element portion has been disclosed (see, for example, Patent Document 1). Patent Document 1 discloses a display device including an illumination unit provided with a plurality of organic electroluminescence elements (organic EL elements) provided as light emitting element units, and a reflective liquid crystal display unit using the illumination unit as a light source. It is disclosed. In the display device described in Patent Document 1, the illumination unit is configured as a front light, and is bonded to the reflective liquid crystal display unit. The illumination unit is configured by a bottom emission type in which light from an organic EL element arranged on a flat substrate is transmitted through the substrate and irradiated to the reflective liquid crystal display unit side. The light emitted from the illuminating unit is reflected to the illuminating unit side in the reflective liquid crystal display unit, and is transmitted through the illuminating unit to be irradiated to the observer side.

JP 2006-350303 A

  In the display device disclosed in Patent Document 1, since the organic EL element of the illumination unit used as the front light is provided between the reflective liquid crystal display unit and the observer, the organic EL element reflects the reflective liquid crystal. The reflected light from the display unit is shielded, and as a result, there is a disadvantage that the luminance of the light emitted to the viewer side is lowered. For this reason, a method for reducing the amount of reflected light to be shielded by arranging the organic EL elements with a larger interval is conceivable. However, in this case, there is a problem in that unevenness occurs in the light irradiated from the organic EL element to the reflective liquid crystal display unit as the interval between the organic EL elements is increased.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to reduce the luminance without causing unevenness in the light emitted to the viewer side. It is an object to provide a lighting device, a display device, and an electronic device that can be suppressed.

Means for Solving the Problems and Effects of the Invention

  A lighting device according to a first aspect of the present invention includes a light emitting element portion provided as a light source, a first surface disposed on a light emitting side of the light emitting element portion and facing the light emitting element portion, a first surface, Is provided on at least one side of the first surface side or the second surface side of the translucent substrate having the second surface on the opposite side, and diverges the light emitted from the light emitting element portion And a covering layer provided so as to cover the concave shape portion and having a refractive index different from that of the concave shape portion.

  In the illumination device according to the first aspect, as described above, from the light emitting element portion to at least one side of the first surface side or the second surface side of the translucent substrate disposed on the light emitting side of the light emitting element portion. By providing the concave portion provided to diverge the emitted light, the light emitted from the light emitting element portion to the translucent substrate side is diverged by the concave portion via the translucent substrate. Can be irradiated outside. Accordingly, since it is possible to irradiate over a wider range compared to the case where there is no concave portion that emits light from the light emitting element portion, the aperture ratio is increased by increasing the arrangement interval of each light emitting element portion. However, it is possible to suppress the occurrence of unevenness in the light emitted from the lighting device. Thereby, for example, even when the reflection type liquid crystal display unit is arranged on the light emitting side of the illumination device, it is possible to irradiate the reflection type liquid crystal display unit with light without unevenness. In addition, even when the illumination device is irradiated with the reflected light from the reflective liquid crystal display unit, the arrangement interval of each light emitting element unit can be increased (the aperture ratio is increased) without causing unevenness of light. Therefore, it is possible to suppress the reflected light from being blocked by the light emitting element portion. Therefore, it is possible to suppress a decrease in the luminance of the light irradiated on the viewer side. Further, for example, by providing a coating layer having a refractive index different from that of the concave shape portion so as to cover the concave shape portion for diverging light, light is diffused at the interface between the concave shape portion and the coating layer. The light can be refracted.

  In the illumination device according to the first aspect, preferably, the concave portion is formed in a circular shape when seen in a plan view. If comprised in this way, when diverging light by a concave shape part, it can diverge light uniformly in all directions seeing planarly.

  In the illuminating device according to the first aspect, preferably, the concave-shaped portion is integrally formed on at least one of the first surface and the second surface of the translucent substrate. If comprised in this way, a structure can be simplified compared with the case where a concave shape part is provided separately from a translucent board | substrate.

  In the illumination device according to the first aspect, preferably, the concave-shaped portion is a first concave-shaped portion integrally provided on the first surface of the translucent substrate, and a second integrally provided on the second surface. A first resin layer having a refractive index smaller than that of the translucent substrate, the translucent substrate being provided so as to cover the first concave portion of the first surface of the translucent substrate; And a second resin layer that is provided so as to cover the second concave portion of the second surface of the transparent substrate and has a refractive index smaller than that of the translucent substrate. If comprised in this way, when the light radiate | emitted from the light emitting element part injects into the 1st surface of a translucent board | substrate from the 1st resin layer whose refractive index is smaller than a translucent board | substrate, a translucent board | substrate is used. It can comprise so that it may refract so that light may diverge in a 1st concave shape part. Then, the light diverged by the first concave shape portion can be refracted so that the light diverges also at the interface between the second resin layer having a different refractive index and the second concave shape portion of the translucent substrate. it can. Therefore, light can be further diverged by the second concave shape portion. By these, since light can be diffused in both the first concave shape portion and the second concave shape portion of the translucent substrate, it is possible to more reliably suppress the occurrence of light unevenness.

  In this case, it is preferable that the second concave shape portion on the second surface of the translucent substrate has a larger width than the first concave shape portion on the first surface. If comprised in this way, since the width | variety of a 2nd concave shape part is larger than a 1st concave shape part, even if light diverges over a wide range by a 1st concave shape part, it can guide | invade to a 2nd concave shape part easily. it can.

  In the illumination device according to the first aspect, preferably, the light emitting element portion is configured by an organic electroluminescence element having a light emitting layer, and light from the light emitting layer of the light emitting element portion is diffused by the concave shape portion, The light-transmitting substrate is configured to be irradiated outside. With this configuration, even when the light-emitting element portion is composed of an organic electroluminescence element, unevenness occurs in the light emitted to the outside by diverging the light emitted from the organic electroluminescence element by the concave shape portion. This can be easily suppressed.

  A display device according to a second aspect of the present invention includes a light emitting element portion provided as a light source, a first surface disposed on a light emitting side of the light emitting element portion and facing the light emitting element portion, a first surface, Is provided on at least one side of the first surface side or the second surface side of the translucent substrate having the second surface on the opposite side, and diverges the light emitted from the light emitting element portion And a light-emitting element portion of the illuminating portion that reflects light to display an illumination portion that includes a concave-shaped portion of the illuminating portion and a coating layer that is provided to cover the concave-shaped portion and has a refractive index different from that of the concave-shaped portion. And a display unit to perform.

  In the display device according to the second aspect, as described above, light is emitted to at least one of the first surface side and the second surface side of the translucent substrate disposed on the light emitting side of the light emitting element unit in the illumination unit. By providing the concave portion provided for diverging the light emitted from the element portion, the light emitted from the light emitting element portion to the light-transmitting substrate side is diverged by the concave portion on the display portion. Can be irradiated. As a result, it is possible to irradiate over a wider range compared to the case where there is no concave shape part that diverges the light from the light emitting element part, so even if the arrangement interval of each light emitting element part is increased, the light is emitted from the illumination device. The occurrence of unevenness in the emitted light can be suppressed. In addition, even when illuminating the illumination unit with the reflected light from the display unit that reflects light, the interval between the light emitting element units can be increased without causing unevenness of light. It is possible to suppress a part of the reflected light from being blocked by the light emitting element portion. Therefore, it is possible to suppress a decrease in luminance when viewed from the observer side. Further, for example, by providing a coating layer having a refractive index different from that of the concave shape portion so as to cover the concave shape portion for diverging light, light is diffused at the interface between the concave shape portion and the coating layer. The light can be refracted.

  In the display device according to the second aspect, preferably, the display unit is configured by a reflective liquid crystal display unit, the light emitting element unit is configured by an organic electroluminescence element having a light emitting layer, and the light emitting layer of the illumination unit is provided. Is emitted to the reflective liquid crystal display unit in a state of being diverged through the concave shaped part. If comprised in this way, while the light emission element part of an illumination part is comprised with an organic electroluminescent element, and the display part is comprised with a reflection-type liquid crystal display part, the light radiate | emitted from an organic electroluminescent element is a concave shape part. By causing the light to diverge, it is possible to easily suppress the occurrence of unevenness in the light applied to the reflective liquid crystal display unit. In addition, since the arrangement interval of the organic electroluminescence elements can be increased while suppressing the occurrence of unevenness of light, a part of the reflected light from the reflective liquid crystal display unit is shielded by the organic electroluminescence elements. Can be suppressed.

  An electronic apparatus according to a third aspect of the present invention includes a display device having the above-described configuration. If comprised in this way, the electronic device containing the display apparatus which can suppress that a brightness | luminance will fall without generating unevenness in the light radiate | emitted to the observer side can be obtained.

It is sectional drawing of the display apparatus provided with the illuminating device by 1st Embodiment of this invention. It is a top view of the illuminating device by 1st Embodiment of this invention. It is an enlarged plan view for demonstrating the structure of the light source part of the illuminating device by 1st Embodiment of this invention. It is sectional drawing for demonstrating the light source part of the illuminating device by 1st Embodiment of this invention (sectional drawing along line 500-500 of FIG. 3). It is sectional drawing for demonstrating the light source part of the illuminating device by 1st Embodiment of this invention (sectional drawing along the 600-600 line | wire of FIG. 3). It is sectional drawing for demonstrating the display apparatus provided with the illuminating device by 1st Embodiment of this invention. It is sectional drawing for demonstrating the light source part of the illuminating device by 2nd Embodiment of this invention. It is sectional drawing for demonstrating the light source part of the illuminating device by 3rd Embodiment of this invention. It is a perspective view for demonstrating the electronic device by the 1st example provided with the display apparatus containing the illuminating device by 1st-3rd embodiment of this invention. It is a perspective view for demonstrating the electronic device by the 2nd example provided with the display apparatus containing the illuminating device by 1st-3rd embodiment of this invention. It is a perspective view for demonstrating the electronic device by the 3rd example provided with the display apparatus containing the illuminating device by 1st-3rd embodiment of this invention.

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

(First embodiment)
With reference to FIGS. 1-5, the structure of the display apparatus 100 by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the display device 100 according to the first embodiment of the present invention includes a front light type illumination unit 10 and a reflective liquid crystal display unit 20. The illumination unit 10 and the reflective liquid crystal display unit 20 are examples of the “illumination device (illumination unit)” and the “display unit” of the present invention, respectively.

  The illumination unit 10 includes a pair of glass substrates 1a and 1b and a plurality of organic electroluminescence elements (hereinafter referred to as organic EL elements) 2 disposed between the glass substrates 1a and 1b. The glass substrate 1a and the glass substrate 1b are bonded via a seal layer 3 made of resin or the like applied to the peripheral portions of each other. A resin layer 4 is formed on the surface of the glass substrate 1 a, and an organic EL element 2 is formed on the surface of the resin layer 4. The organic EL elements 2 are arranged in a matrix (see FIG. 2) in plan view. On the surface of the glass substrate 1b, light shielding films 5 are respectively formed at positions corresponding to regions where the organic EL elements 2 on the glass substrate 1a side are disposed. The glass substrates 1a and 1b are examples of the “translucent substrate” in the present invention. The organic EL element 2 and the resin layer 4 are examples of the “light emitting element portion” and the “first resin layer (covering layer)” in the present invention, respectively.

  The organic EL element 2 is configured by laminating an anode layer 2a, an organic layer 2b, and a cathode layer 2c in this order, and the organic layer 2b is formed by a voltage applied between the anode layer 2a and the cathode layer 2c. It is configured to emit light. In addition, a translucent insulating film 6 is formed in a region on the surface of the anode layer 2a where the organic layer 2b is not provided. The insulating film 6 is provided in order to prevent the anode layer 2a and the cathode layer 2c from being short-circuited. As shown in FIGS. 1 and 2, the first transparent electrode 7 and the second transparent electrode 8 made of ITO formed in a comb-like shape are formed on the surface of the resin layer 4. The comb-shaped first transparent electrode 7 and the second transparent electrode 8 are configured such that the tooth portions 7a and the tooth portions 8a are alternately arranged. A positive voltage is applied from the first transparent electrode 7 to the anode layer 2a, and a negative voltage is applied from the second transparent electrode 8 to the cathode layer 2c. The organic layer 2b is an example of the “light emitting layer” in the present invention.

  Here, with reference to FIGS. 3-5, the structure of the area | region in which the organic EL element 2 which is a light source part was formed is demonstrated in detail.

  First, as shown in FIG. 3 and FIG. 4 (cross-sectional view taken along line 500-500 in FIG. 3), the organic layer 2b is formed on the surface of the tooth portion 7a of the first transparent electrode 7 with a predetermined interval. In the tooth portion 7a, a region where the organic layer 2b is disposed is configured as the anode layer 2a. A cathode layer 2c is formed so as to cover the organic layer 2b. The cathode layer 2c is made of, for example, aluminum and has a function of reflecting light toward the anode layer 2a when the organic layer 2b emits light.

  As shown in FIGS. 3 and 5 (cross-sectional view taken along the line 600-600 in FIG. 3), an insulating film 6 is formed on the surface of the second transparent electrode 8, and the insulating film 6 A hole 6a is formed in a region located on the tooth portion 8a, and the cathode layer 2c is formed in contact with the second transparent electrode 8 through the hole 6a. The cathode layer 2c is formed so as to cover the hole 6a and extend from the hole 6a to a position covering the organic layer 2b.

  With the above configuration, a positive voltage applied to the tooth portion 7a (anode layer 2a) of the first transparent electrode 7 and a negative voltage applied to the cathode layer 2c via the tooth portion 8a of the second transparent electrode 8 Are applied to the organic layer 2b, and the organic layer 2b emits light in the Z1 direction. Then, when the cathode layer 2c functions as a reflecting member, the light leaking in the Z2 direction side is reflected by the cathode layer 2c and irradiated to the glass substrate 1a side. That is, the illumination part 10 in 1st Embodiment is comprised by the bottom emission type | mold which irradiates light outside (Z1 direction side) through the glass substrate 1a with which the organic EL element 2 is arrange | positioned.

  Here, in 1st Embodiment, the part corresponding to the area | region where the organic layer 2b is arrange | positioned in the 1st surface 1c which is the surface of the side (Z2 direction side) by which the organic EL element 2 of the glass substrate 1a is arrange | positioned. A concave portion 1e is formed integrally with the glass substrate 1a (in the first embodiment, immediately below the organic layer 2b). In addition, as shown in FIG. 2, the concave portion 1e has a circular shape in plan view, and the organic layer 2b disposed on the upper portion of the concave portion 1e also has the same shape as the concave portion 1e. It is formed in a circular shape. Thereby, the light incident on the concave portion 1e is configured to diverge uniformly in all directions when viewed in a plan view. Further, as shown in FIG. 5, the resin layer 4 is formed so as to cover the glass substrate 1a and the concave portion 1e, and the side on which the organic EL element 2 of the resin layer 4 is disposed (Z2 direction side). The surface of is formed into a flat surface. The concave shape portion 1e in the first embodiment is an example of the “first concave shape portion” in the present invention.

  Moreover, in 1st Embodiment, the resin layer 4 has a refractive index smaller than the glass substrate 1a (refractive index about 1.5). Specifically, the resin layer 4 is made of, for example, fluorine-containing alicyclic polyimide (refractive index of 1.47 or more and 1.48 or less), ethylenically unsaturated group-containing fluorine-containing polymer (refractive index of about 1.43). In addition, it is composed of fluorine-containing acrylates, fluorine-based resins, acrylic resins, and the like. Thereby, the light irradiated from the organic layer 2 b passes through the resin layer 4 and enters the glass substrate 1 a having a higher refractive index than the resin layer 4. The light from the organic EL element 2 is diverged by the concave portion 1e when entering the concave portion 1e of the glass substrate 1a, and is transmitted through the glass substrate 1a in the diverged state and reflected by the reflective liquid crystal display unit 20. It is configured to irradiate the side (Z1 direction side).

  Next, the configuration of the reflective liquid crystal display unit 20 will be described with reference to FIG. The reflective liquid crystal display unit 20 includes a pair of glass substrates 21a and 21b, and a plurality of switching thin film transistors (TFTs) 22 are formed on the surface of the glass substrate 21a. An interlayer insulating film 23 is formed on the surface of the thin film transistor 22, and a pixel electrode 24 is formed on the surface of the interlayer insulating film 23 so as to correspond to each thin film transistor 22. The thin film transistor 22 and the pixel electrode 24 are connected through a contact hole 23 a formed in the interlayer insulating film 23. The pixel electrode 24 is made of a reflective material such as aluminum, and has a function of reflecting light incident from the illumination unit 10 to the viewer side (Z2 direction side). A common electrode 25 is formed on the surface of the glass substrate 21b facing the glass substrate 21a (Z1 direction side). A liquid crystal 30 is filled between the glass substrates 21a and 21b. Further, a light scattering layer 26 is formed on the surface of the glass substrate 21b opposite to the surface on which the common electrode 25 is formed (Z2 direction side), and on the surface of the light scattering layer 26, A polarizing plate 27 is formed.

  The reflective liquid crystal display unit 20 and the illumination unit 10 are bonded to each other by a resinous adhesive layer 40 provided between the polarizing plate 27 of the reflective liquid crystal display unit 20 and the glass substrate 1a of the illumination unit 10. ing.

  In the first embodiment, as described above, the organic EL element is provided by providing the first surface 1c of the glass substrate 1a with the concave portion 1e provided to diverge the light emitted from the organic EL element 2. The light emitted from 2 to the glass substrate 1a can be radiated to the outside through the glass substrate 1a in a state of being diverged by the concave portion 1e. Therefore, compared with the case where the concave-shaped portion 1e that diverges the light from the organic EL element 2 is not provided, irradiation can be performed over a wider range, so that the aperture ratio can be increased by increasing the arrangement interval between the organic EL elements 2. Even if it increases, it can suppress that a nonuniformity generate | occur | produces in the light radiate | emitted from the illuminating device 10. FIG. Thereby, it is possible to irradiate the reflective liquid crystal display unit 20 disposed on the light emitting side of the illumination device 10 with light without unevenness. Further, even when the reflected light from the reflective liquid crystal display unit 20 enters the illumination device 10, the arrangement interval of the organic EL elements 2 is increased without causing unevenness of light (increasing the aperture ratio). Therefore, it is possible to suppress the reflected light from being blocked by the organic EL element 2. Therefore, it is possible to suppress a decrease in the luminance of the light irradiated on the viewer side. Further, by providing the resin layer 4 having a refractive index smaller than that of the concave shape portion 1e so as to cover the concave shape portion 1e for diverging light, light is diverged between the concave shape portion 1e and the resin layer 4. The light can be refracted as if.

  In the first embodiment, when the concave portion 1e is formed in a circular shape when seen in a plan view, when light is diffused by the concave shape portion 1e, the concave shape portion 1e is seen in all directions when seen in a plan view. It is possible to emit light uniformly.

  Moreover, in the said 1st Embodiment, the recessed shape part 1e is separately formed between the organic EL element 2 and the glass substrate 1a by integrally forming the recessed shape part 1e in the 1st surface 1c of the glass substrate 1a. Compared with the case of providing, the structure can be simplified.

  Moreover, in the said 1st Embodiment, it comprises so that the refractive index of the resin layer 4 formed so that the concave shape part 1e of the 1st surface 1c of the glass substrate 1a may be made smaller than the refractive index of the glass substrate 1a. As a result, a resin layer 4 having a refractive index smaller than that of the glass substrate 1a is formed between the organic EL element 2 and the concave portion 1e provided on the first surface 1c of the glass substrate 1a. The light emitted from 2 can be refracted so that the light diverges, and the resin layer 4 having a small refractive index can be incident on the glass substrate 1 a having a refractive index larger than that of the resin layer 4. Therefore, it is possible to irradiate the glass substrate 1a side while diverging in the concave portion 1e while suppressing the total reflection of the light incident on the glass substrate 1a from the resin layer 4.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In the second embodiment, unlike the first embodiment in which the concave portion 1e is formed on the first surface 1c of the glass substrate 1a in the illumination unit 10, the concave portion is formed on the second surface 201d of the glass substrate 201a in the illumination unit 210. An example of forming the shape portion 201e will be described.

  As shown in FIG. 7, the illumination unit 210 in the display device 200 according to the second embodiment of the present invention includes an organic EL composed of an anode layer 2a, an organic layer 2b, and a cathode layer 2c on a first surface 201c of a glass substrate 201a. Element 2 and insulating film 6 are formed. A resin layer 204 is provided between the illumination unit 210 and the reflective liquid crystal display unit 20 on the second surface 201d of the glass substrate 201a. The resin layer 204 is an example of the “second resin layer (coating layer)” in the present invention.

  Here, in 2nd Embodiment, the area | region where the organic layer 2b is arrange | positioned in the 2nd surface 201d which is the surface (Z1 direction side) surface opposite to the side where the organic EL element 2 of the glass substrate 201a is arrange | positioned. A concave portion 201e is integrally formed with the glass substrate 201a in a portion corresponding to (a portion immediately below the organic layer 2b). And the resin layer 204 is formed so that the glass substrate 201a and the recessed shape part 201e may be covered. The concave portion 201e in the second embodiment is an example of the “second concave portion” in the present invention.

  Moreover, in 2nd Embodiment, the resin layer 204 is comprised by the material which has a refractive index smaller than the glass substrate 201a similarly to the said 1st Embodiment. The depth and curvature of the concave portion 201e in the arrow Z2 direction are such that when light enters the resin layer 204 having a smaller refractive index than the glass substrate 201a from the glass substrate 201a, the glass substrate 201a and the resin layer 204 The size is set such that the light is not totally reflected at the interface. Thereby, the light irradiated from the organic EL element 2 is configured to be refracted so as to diverge by the concave portion 201e without being totally reflected at the interface between the glass substrate 201a and the resin layer 204 having different refractive indexes. Has been.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

  In the second embodiment, as described above, even when the concave portion 201e is formed on the second surface 201d side of the glass substrate 201a, the reflective liquid crystal display portion is scattered while scattering the light emitted from the organic EL element 2. 20 can be emitted.

  Moreover, in 2nd Embodiment, the light radiate | emitted from the organic EL element 2 is easily made in the interface of the glass substrate 201a and the resin layer 204 by comprising the glass substrate 201a and the resin layer 204 in a mutually different refractive index. The light can be refracted so as to diverge.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. In the third embodiment, the first embodiment in which the concave portion 1e is formed only on the first surface 1c of the glass substrate 1a and the concave portion 201e is formed only in the second surface 201d of the glass substrate 201a. Unlike 2nd Embodiment, the example which forms the 1st recessed shape part 301e and the 2nd recessed shape part 301f, respectively on both the 1st surface 301c and the 2nd surface 301d of the glass substrate 301a is demonstrated.

  As shown in FIG. 8, the illumination unit 310 in the display device 300 according to the third embodiment of the present invention includes a first resin layer 304a formed on the surface of the first surface 301c of the glass substrate 301a, and a first resin layer 304a. The organic EL element 2 and the insulating film 6 are formed on the surface of the resin layer 304a. Further, a second resin layer 304b for bonding the illumination unit 310 and the reflective liquid crystal display unit 20 is provided on the surface of the second surface 301d of the glass substrate 301a.

  Here, in the third embodiment, the first surface 301c, which is the surface of the glass substrate 301a on the side where the organic EL element 2 is disposed, has a portion corresponding to the region where the organic layer 2b is disposed (of the organic layer 2b). The first concave portion 301e is integrally formed in the lower part. A second concave shape is formed immediately below the first concave portion 301e on the second surface 301d, which is the surface opposite to the side on which the organic EL element 2 is disposed (the Z1 direction side) of the glass substrate 301a. The part 301f is integrally formed.

  In the third embodiment, each of the first resin layer 304a and the second resin layer 304b is made of a material having a refractive index smaller than that of the glass substrate 301a. The depth and curvature of the first concave portion 301e in the direction of the arrow Z1 are the same as those when the light enters the second resin layer 304b having a refractive index smaller than that of the glass substrate 301a from the glass substrate 301a. The size is set such that light is not totally reflected at the interface with the second resin layer 304b. That is, the depth and curvature of the first concave portion 301e in the direction of the arrow Z1 are such that the light diverged by the first concave portion 301e is totally reflected on the interface between the glass substrate 301a and the second resin layer 304b. The size is set so as not to be incident depending on the incident angle. As a result, when the second surface 301d is flat, it is possible to irradiate the reflective liquid crystal display unit 20 side while further scattering the totally reflected light.

  In the third embodiment, the second concave portion 301f has a width W2 that is larger than the width W1 of the first concave portion 301e. Specifically, the width W2 of the second concave shape portion 301f is set to such a size that the light emitted by the first concave shape portion 301e is guided to the concave region of the second concave shape portion 301f. .

  With the above configuration, light incident on the glass substrate 301a from the organic EL element 2 via the first resin layer 304a first diverges by the first concave portion 301e and transmits through the glass substrate 301a, and the glass substrate 301a and the first The second resin layer 304b is refracted so as to diverge further without being totally reflected at the interface with the resin layer 304b.

  The remaining configuration of the third embodiment is the same as that of the first and second embodiments.

  In the third embodiment, as described above, the first concave portion 301e is formed on the first surface 301c of the glass substrate 301a, and the second concave portion 301f is formed on the second surface 301d, whereby the organic EL When the light emitted from the element 2 enters the first surface 301c of the glass substrate 301a from the first resin layer 304a having a refractive index smaller than that of the glass substrate 301a, the light is emitted from the first concave portion 301e of the glass substrate 301a. It can be configured to refract so as to diverge. Then, the light diverged by the first concave portion 301e is refracted so that the light diverges also at the interface between the second resin layer 304b having a different refractive index and the second concave portion 301f of the glass substrate 301a. be able to. Therefore, the light can be further diffused by the second concave portion 301f. As a result, since light can be diffused in both the first concave shape portion 301e and the second concave shape portion 301f of the glass substrate 301a, it is possible to more reliably suppress the occurrence of light unevenness. .

  In the third embodiment, the width W2 of the second concave portion 301f of the second surface 301d of the glass substrate 301a is configured to be larger than the width W1 of the first concave portion 301e of the first surface 301c. Thus, even if the light incident from the organic EL element 2 by the first concave shape portion 301e diverges over a wide range, the width W2 of the second concave shape portion 301f is larger than the width W1 of the first concave shape portion 301e. It can be easily guided to the second concave portion 301f.

  The remaining effects of the third embodiment are similar to those of the aforementioned first and second embodiments.

  Next, electronic devices according to first to third examples using the display devices 100, 200, and 300 according to the first to third embodiments of the present invention will be described with reference to FIGS. 9 to 11.

  As shown in FIGS. 9 to 11, the display devices 100, 200 and 300 according to the first to third embodiments of the present invention include a PC (Personal Computer) 400 according to the first example and a mobile phone 410 according to the second example. And it is possible to use for the information portable terminal 420 (PDA: Personal Digital Assistants) by the 3rd example. In the PC 400 according to the first example of FIG. 9, the display devices 100, 200 and 300 according to the first to third embodiments of the present invention can be used for the input unit 400a such as a keyboard and the display screen 400b. In the mobile phone 410 according to the second example of FIG. 10, the display devices 100, 200 and 300 according to the first to third embodiments of the present invention are used for the display screen 410a. In the information portable terminal 420 according to the third example of FIG. 11, the display devices 100, 200, and 300 according to the first to third embodiments of the present invention are used for the display screen 420a.

  The embodiment disclosed this time is illustrative in all points and is not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the example in which the concave portion is formed on the surface of the glass substrate has been shown. However, the present invention is not limited thereto, and the concave portion may be formed in addition to the glass substrate. . Specifically, for example, a lower resin layer having a concave portion is formed on a flat glass substrate, and an upper layer having a refractive index lower than that of the lower resin layer is formed on the surface of the lower resin layer. The case where a resin layer is formed is considered.

  In the first to third embodiments, the example in which the first transparent electrode and the second transparent electrode that supply potentials to the anode layer and the cathode layer are each formed in a comb-teeth shape is shown. However, the present invention is not limited to this, and may be formed in a shape other than the comb-teeth shape.

  In the first to third embodiments, the organic EL elements are arranged in a matrix. However, the present invention is not limited to this, and the organic EL elements may be arranged in a matrix.

  Moreover, although the example which forms an insulating film so that the substantially whole region of a 1st transparent electrode and a 2nd transparent electrode may be covered was shown in the said 1st-3rd embodiment, this invention is not limited to this, A cathode layer and You may provide only in the area | region surrounding the periphery of an organic layer so that an anode layer may not contact.

  Moreover, although the example which makes the width | variety of a 2nd recessed shape part larger than the width | variety of a 1st recessed shape part was shown in the said 3rd Embodiment, this invention is not restricted to this, A 1st recessed shape part and 2nd You may make the width | variety with a concave shape part the substantially same magnitude | size.

1a, 201a, 301a Glass substrate (translucent substrate)
1c, 201c, 301c 1st surface 1d, 201d, 301d 2nd surface 1e, 301e Concave shape part (1st concave shape part)
2 Organic EL device (light emitting device)
4, 304a Resin layer (coating layer) (first resin layer)
10, 210, 310 Lighting device (lighting unit)
20 Reflective liquid crystal display (display)
100, 200, 300 Display devices 201e, 301f Concave shaped part (second concave shaped part)
204, 304b Resin layer (coating layer) (second resin layer)
400 PC (electronic equipment)
410 Mobile phone (electronic equipment)
420 Information portable terminal (electronic equipment)

Claims (9)

A light emitting element provided as a light source;
A translucent substrate disposed on the light emitting side of the light emitting element portion and having a first surface on the side facing the light emitting element portion, and a second surface opposite to the first surface;
A concave portion provided on at least one side of the first surface side or the second surface side of the translucent substrate, for diverging light emitted from the light emitting element portion;
An illuminating device comprising: a covering layer provided to cover the concave shape portion and having a refractive index different from that of the concave shape portion.   The lighting device according to claim 1, wherein the concave portion is formed in a circular shape when seen in a plan view.   The lighting device according to claim 1, wherein the concave portion is integrally formed on at least one of the first surface and the second surface of the translucent substrate. The concave shape portion includes a first concave shape portion integrally provided on the first surface of the translucent substrate, and a second concave shape portion integrally provided on the second surface,
The covering layer is provided so as to cover the first concave portion of the first surface of the translucent substrate, and a first resin layer having a refractive index smaller than that of the translucent substrate;
4. The device according to claim 1, further comprising: a second resin layer that is provided so as to cover the second concave portion of the second surface of the translucent substrate and has a refractive index smaller than that of the translucent substrate. The lighting device according to item 1.   The lighting device according to claim 4, wherein the second concave shape portion of the second surface of the translucent substrate has a larger width than the first concave shape portion of the first surface. The light emitting element portion is composed of an organic electroluminescence element having a light emitting layer,
The light from the light emitting layer of the said light emitting element part is comprised so that it may radiate | emit to the exterior through the said translucent board | substrate while being diffused by the said concave shape part. The lighting device according to claim 1. A light emitting element portion provided as a light source; a first surface disposed on a light emitting side of the light emitting element portion and facing the light emitting element portion; and a second surface opposite to the first surface. A translucent substrate having a concave shape portion provided on at least one side of the first surface side or the second surface side of the translucent substrate for diverging light emitted from the light emitting element portion; An illumination unit that is provided so as to cover the concave part and includes a coating layer having a refractive index different from that of the concave part;
A display device, comprising: a display unit that performs display by reflecting light from a light emitting element unit of the illumination unit. The display unit is composed of a reflective liquid crystal display unit, and the light emitting element unit is composed of an organic electroluminescence element having a light emitting layer,
The display device according to claim 7, wherein light from the light emitting layer of the illuminating unit is configured to irradiate the reflective liquid crystal display unit in a state of being diverged through the concave portion.   An electronic apparatus comprising the display device according to claim 7.

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