JP2015028976A - Solar cell composite light emitting device and solar cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery composite light-emitting device which outputs image light of high brightness into a limited field of view, and can use the external light, entering while inclining, as power generation power.SOLUTION: A solar battery composite light-emitting device includes a plurality of optical elements, a plurality of solar cell units, a plurality or single light-emitting element laminated sequentially. Between adjacent solar cell units, apertures are formed at the pitch of the light-emitting elements. The optical elements are arranged so that the center of the optical axis penetrates the aperture, the light from a light-emitting element passed through the aperture is emitted to the outside, and the external light entering while inclining for the optical axis of the optical element is condensed to the solar cell unit.

Description

  The present invention relates to a solar cell composite light-emitting device in which a solar cell is installed on the surface of a light-emitting device such as a display device or a lighting device, and a solar cell used therefor.

  2. Description of the Related Art Various portable information processing devices equipped with a liquid crystal display such as a cellular phone are required to independently secure the power necessary for long-term continuous use. The most effective method is a method of expanding the capacity of the secondary battery for charging, and development of a large-capacity secondary battery is being actively promoted.

  On the other hand, a method in which a solar battery is mounted as an auxiliary power source in combination with a secondary battery has been developed. The solar cell has a planar shape in which the light receiving surface faces the light source, and the larger the light receiving area, the larger the output power can be obtained. Therefore, especially in the case of a portable information processing device mounted with a large-screen liquid crystal display, the surface of a large-area, flat liquid crystal display is the optimal installation location. However, since the solar cell is generally colored and opaque, if the solar cell is installed on the surface of the liquid crystal display, the visibility of the display image on the liquid crystal display is significantly reduced.

  Patent Document 1 discloses a technology that achieves both power generation by a solar cell and visibility of a liquid crystal display by installing a solar cell having an opening on the surface of the liquid crystal display. In this technology, in order to improve the visibility of the liquid crystal display, not only an opening is provided in the solar cell, but also a device is used in combination with a lens for guiding the backlight light of the liquid crystal display to the opening of the solar cell. Yes. Thereby, when the lens is not installed, the backlight transmittance is prevented from being lowered due to light shielding at the solar cell portion, and the luminance reduction of the liquid crystal display is improved.

  However, in the configuration disclosed in Patent Document 1, the area of the opening provided for the visibility of the liquid crystal display in the area of the liquid crystal display cannot be used as the light receiving surface of the solar cell, It is conceivable that the output power amount of the solar cell is reduced.

US Patent Application Publication No. 2007/0102035

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a solar cell composite display device that achieves both power generation by a solar cell and visibility such as luminance in a predetermined direction of a display device such as a liquid crystal display at a high level. Note that the present invention is not limited to a display device, and may be applied to various light-emitting devices using a light-emitting element, such as a lighting device.

The present invention solves such a problem, and is characterized by having the following constituent elements.
The solar cell composite light emitting device according to the present invention is
A plurality of optical elements, a plurality of solar cell units, a plurality of or a plurality of light emitting elements are sequentially laminated,
Between adjacent solar cell units, openings formed at a predetermined pitch are provided,
The optical element is disposed so that the center of the optical axis passes through the opening, emits light from the light emitting element that has passed through the opening, and is inclined with respect to the optical axis of the optical element. The incident external light is condensed on the solar cell unit.

  In the solar cell composite light-emitting device according to the present invention, the optical element is a convex lens.

In the solar cell composite light emitting device according to the present invention,
The optical element is arranged so that the optical axis center thereof passes through the substantial center of the opening.

In the solar cell composite light emitting device according to the present invention,
A condensing lens is provided between the solar cell unit and the light emitting element,
The condensing lens is disposed so that a light beam emitted from the light emitting element passes through the opening.

The solar cell module according to the present invention is
Arranged on a light emitting device having a plurality of or single light emitting elements,
A plurality of optical elements and a plurality of solar cell units are sequentially laminated,
Between adjacent solar cell units, openings formed at a predetermined pitch are provided,
The optical element is disposed so that the center of the optical axis passes through the opening, emits light from the light emitting element that has passed through the opening, and is inclined with respect to the optical axis of the optical element. The incident external light is condensed on the solar cell unit.

  By applying the solar cell composite light-emitting device of the present invention or the solar cell according to the present invention to a light-emitting device, it is possible to output high-luminance image light within a limited field of view, and peek at information processing devices and the like. It can also be used as a prevention function. Then, the incident light inclined at an angle is used as generated power to improve the power generation efficiency.

Sectional drawing which shows the structure of the solar cell composite display (light emission) apparatus which concerns on embodiment of this invention. The front view and sectional drawing which show the structure of the solar cell composite display (light emission) apparatus which concerns on embodiment of this invention. The front view and sectional drawing which show the structure of the solar cell composite display (light emission) apparatus which concerns on other embodiment of this invention. The front view and sectional drawing which show the structure of the solar cell composite display (light emission) apparatus which concerns on other embodiment of this invention. Sectional drawing which shows the structure of the solar cell composite display (light emission) apparatus which concerns on other embodiment of this invention. The figure which shows the structure of the information processing apparatus which uses the solar cell composite display (light emission) apparatus which concerns on embodiment of this invention.

  FIG. 1 is a cross-sectional view showing a configuration of a solar cell composite display light emitting device according to an embodiment of the present invention. The solar cell composite display device according to the present invention can be applied to a display device such as a liquid crystal display device that emits image light, or an illumination device that emits illumination light having no information. Here, a solar cell composite display device using a display device will be described.

  As shown in FIG. 1, in the solar cell composite display device, an optical element 11, a solar cell unit 12, and a display pixel 22 as a light emitting element are stacked in the order in which external light enters. In the figure, the space provided between the optical element 11 and the display pixel 22 may be filled with a transparent medium at the wavelength used. FIG. 1 shows a minute part of a solar cell composite display device, and the solar cell composite display device has a large number of these configurations.

  The solar cell unit 12 is composed of units such as cells and modules, and a plurality of solar cell units form a solar cell. Between the adjacent solar cell units 12, an opening 12a for emitting image light from the display pixel 22 is formed.

  A convex lens is used for the optical element 11 of the present embodiment. The optical element 11 emits image light emitted from the display pixel 22 and passed through the opening 12a provided between the solar cell units 12 to the outside. In the present embodiment, the optical axis center 11 </ b> A of the optical element 11 (convex lens) is disposed so as to penetrate the display pixel 22. In the present embodiment, the optical element 11 and the solar cell unit 12 are positioned so that the optical axis center 11A of the optical element 11 passes through the approximate center of the opening 12a. Therefore, the image light emitted from the optical element 11 is substantially parallel to the optical axis center 11A, and the solar cell composite light-emitting device can provide the luminance of the display pixels 22 in a concentrated manner in the front direction.

  When such a solar cell composite light emitting device is used in an information processing device such as a mobile phone, an image with high luminance is seen from the front of the information processing device, and the image cannot be seen from an oblique direction. Or, it becomes an image with low visibility. Therefore, it also has a peep prevention function.

  The optical element 11 has a function of condensing external light on the solar cell unit 12. As can be seen from the fact that the optical axis center 11A of the optical element 11 is positioned so as to pass through the opening 12a between the solar cell units 12, external light incident along the optical axis center 11A of the optical element 11 is The external light that is not incident on the solar cell unit 12 but is inclined with respect to the optical axis center 11 </ b> A is incident on the solar cell unit 12.

  When using an information processing device such as a mobile phone, a case where a light source is located behind the user is considered. In that case, in the information processing device, the user is located in the direction of the optical axis center 11A, and the solar cell It can be considered that a large amount of external light is incident on the composite light emitting device with an inclination with respect to the optical axis center 11A. In the present embodiment, it is possible to take in external light incident on the solar cell unit 12 at an inclination to the information processing device using the solar cell composite light emitting device.

  FIG. 2 is a diagram showing a relationship between a front view and a cross-sectional view showing the configuration of the solar cell composite display device according to the embodiment of the present invention. 2A shows a front view of the solar cell composite display device, and FIG. 2B shows a side view of the solar cell composite display device. 2B is a cross-sectional view of the solar cell composite light-emitting device, similarly to FIG. 1, and is a cross-sectional view taken along the line DD in FIG. 2A.

  The solar cell composite display device of the present embodiment has a line configuration in which the respective components are arranged in the vertical direction. The optical element 11 and the solar cell unit 12 extend in the vertical direction on the paper surface. The display pixel 22 is disposed at a position where it can be seen through the optical element 11 when viewed from the front. With such a line configuration, it is possible to simplify the manufacturing process when manufacturing each component. Further, the solar cell unit 12 can be wired around the solar cell composite display device. The optical elements 11 are arranged in the vertical direction.

In the arrangement form of FIG. 2A, the visual field range in the left-right direction is limited, but since the vertical direction is not shielded by the solar cell unit 12, the visual field range is wide. When the solar cell composite display device is applied to an information processing device, the image light emitted from one display pixel 22 is provided to the user by arranging the wide viewing direction to be the left-right direction of the user. It is possible to improve visibility by making the light incident on both the left and right eyes and widening the visual field range in the left-right direction of the user.

  An example of the method for manufacturing the solar cell composite display device of the present embodiment will be described. First, a shaping roll having a groove (concave portion) for forming a lens shape having the optical element 11 at a pitch (interval) of the display pixels 22 is prepared. An epoxy acrylate-based UV curable resin was supplied to the shaping mold roll from the supply device, and the PET film having a thickness of 188 μm was stuck with the nip roll while being sandwiched between the shaping mold roll and the resin. Thereafter, ultraviolet rays were irradiated from the PET film side to cure the ultraviolet curable resin, and an optical sheet including the optical element 11 was formed.

  Next, a patterned amorphous silicon solar cell is manufactured by a general manufacturing method. That is, first, a transparent electrode layer is provided on the entire surface of one surface of the transparent substrate 46, and an amorphous silicon layer is formed thereon by chemical vapor deposition (CVD). Then, a patterned solar cell layer is obtained by photoetching with a silicon etching solution containing hydrofluoric acid in an aqueous medium. Thereafter, a metal electrode layer is formed on the remaining amorphous silicon layer by a vacuum film forming method. Thus, a patterned amorphous silicon solar cell (solar cell unit) having a light-transmitting opening with the same pattern as the pitch (interval) of the display pixels is formed.

  Next, the display pixel 22 and the patterned amorphous silicon solar cell solar cell unit are superimposed on each other on the display portion where the display pixel 22 is formed, and bonded with a thermosetting resin.

  Next, the patterned amorphous silicon solar cell is overlaid with a thermosetting resin so that the opening 12a of the patterned amorphous silicon solar cell coincides with the optical axis center 11A of the optical element 11 (the top of the convex lens). A solar cell composite display device is manufactured by bonding. As mentioned above, although an example of the manufacturing method of a solar cell composite display device was demonstrated, the various forms which implement | achieve the structure demonstrated in FIG. 1, FIG. 2 are employ | adopted as the manufacturing method of a solar cell composite display (light emission) apparatus. It is possible.

  In FIG. 2, although the form which arrange | positions each structure of a solar cell composite display in a line form on a front view was demonstrated, the arrangement form of each structure, such as the optical element 11 and the solar cell unit 12, has another form. It is possible to adopt. The front view which shows the structure of the solar cell composite display (light emission) apparatus which concerns on other embodiment of this invention is shown by FIG. In the form of FIG. 3, as can be seen from the front view of FIG. 3A, the solar cell units 12 are both formed in a lattice shape, and the optical element 11 is arranged so that its periphery is positioned on the solar cell unit 12. Arranged in a shape. The cross-sectional view shown in FIG. 3B is a cross-sectional view taken along the line DD in FIG. 3A and has the optical configuration described in FIGS. In FIG. 3A, the optical element 11 has a rectangular shape, but a circular shape may be employed. The display pixels 22 are arranged between the lattices of the solar cell unit 12 and are arranged on the back surface of the optical element 11 to provide an image to the observer by emitting image light.

The front view which shows the structure of the solar cell composite display (light emission) apparatus concerning other embodiment of this invention is shown by FIG. In the form of FIG. 4, as can be seen from the front view of FIG. 4A, the optical element 11 and the solar cell unit 12 are both arranged in an island shape. The cross-sectional view shown in FIG. 4B is a cross-sectional view taken along the line DD, and has the optical configuration described in FIGS. The display pixel 22 is disposed on the back surface of the optical element 11 and provides an image to the observer by emitting image light. The solar cell unit 12 is arranged in an island shape so as to straddle the optical elements 11 of the four optical elements 11 so as to be able to receive incident external light inclined with respect to the optical axis center of the optical element 11. Has been placed. In this embodiment as well, the optical element 11 has a rectangular shape, but a circular shape can also be adopted.

  In addition, the solar cell unit 12 of the solar cell composite display (light emitting) device in FIG. 3 is arranged in a lattice shape, and is in the island shape of the solar cell unit 12 in FIG. It is more advantageous than the arranged solar cell unit 12.

  As described above, the solar cell composite display device according to the present embodiment has been described with reference to FIGS. 1 to 4, but according to the solar cell composite display device according to the present invention, the output power amount in the solar cell is reduced. It becomes possible to achieve both improvement and improvement of observation luminance by the light emitting element. Moreover, the solar cell composite light-emitting device of this embodiment makes it possible to concentrate the luminance of the image light with respect to a predetermined direction, improve the luminance with respect to the predetermined direction, and visibility to the direction other than the predetermined direction. This is effective as a peep prevention in the information processing apparatus.

  1 to 4, the case where the present invention is applied to a display device has been described. However, the present invention can be applied not only to a display device but also to various light emitting devices having a light emitting element such as a lighting device. Furthermore, the present invention can be provided as a solar cell module in which the optical element 11 and the solar cell unit 12 are laminated. The solar cell module thus provided is bonded to a light emitting device such as a display device or a lighting device, and can function as a solar cell composite light emitting device as in the various embodiments described above. In joining the solar cell and the light emitting device, it is important that the optical element 11 provided on the solar cell side, the light emitting device (display pixel 22) on the light emitting device side, and the pitch and alignment of both are appropriately performed. Note that in the case of application to a lighting device, the light-emitting elements do not have to be separated into a plurality, and it is conceivable that they are formed with one (single) light-emitting elements. In this case, although the light irradiated to the solar cell unit 12 is emitted, it can be output within the field of view limited by the optical element 11.

  FIG. 5 is a cross-sectional view showing the configuration of the solar cell composite display device according to the embodiment of the present invention. The solar cell composite display device of this embodiment is different from the above-described embodiment in that a condensing lens 21 is provided between the solar cell unit 12 and the display pixel 22. The condensing lens 21 condenses the image light emitted from the display pixels 22 in the openings 12 a between the solar cell units 12. By providing the condensing lens 21, the width of the display pixel 22 can be made larger than the width of the opening 12a, and the luminance of the image light can be improved. Moreover, since the width of the solar cell unit 12 can be increased as the width of the opening 12a is reduced, the amount of power generated by the solar cell unit 12 can be increased.

  FIG. 6 shows a configuration of an information processing apparatus using the solar cell composite display device according to the embodiment of the present invention. The information processing apparatus according to the present embodiment is assumed to be a portable information processing apparatus such as a mobile phone, and includes a display unit 30, a solar cell 40, a control unit 51, a charge control unit 52, an image control unit 53, and a battery 54. , An input unit 55, a communication unit 56, and the like.

  The display unit 30 and the solar cell 40 are configured by a solar cell composite display device according to an embodiment of the present invention. The display unit 30 includes a plurality of display pixels 22, and the solar cell 40 is A plurality of solar cell units 12 are provided.

The control unit 51 includes a CPU, a ROM, a RAM, and the like, and controls each component of the information processing apparatus such as the charging control unit 52 and the image control unit 53 in an integrated manner. By receiving external light, the current generated by the solar cell 40 charges the battery 54 by the charge control unit 52. The battery 54 supplies power to each unit of the information processing apparatus. The image control unit 53 displays an observable image on the display unit 30 by controlling the light emission state of the display pixel 22 based on the control of the control unit 51.

  As described above, the solar cell composite display device according to the present embodiment can be used in a portable information processing device using the battery 54 to extend the use time by self-power generation by the solar cell 40. ing.

  Note that the present invention is not limited to these embodiments, and embodiments configured by appropriately combining the configurations of the respective embodiments also fall within the scope of the present invention.

DESCRIPTION OF SYMBOLS 11 ... Optical element 12 ... Solar cell unit 12a ... Opening part 21 ... Condensing lens 22 ... Display pixel (light emitting element)
30 ... Display section (light emitting section)
40 ... solar cell 51 ... control unit 52 ... charge control unit 53 ... image control unit 54 ... battery 55 ... input unit 56 ... communication unit

Claims (5)

A plurality of optical elements, a plurality of solar cell units, a plurality of or single light emitting elements are sequentially stacked,
Between adjacent solar cell units, openings formed at a predetermined pitch are provided,
The optical element is disposed so that the center of the optical axis passes through the opening, emits light from the light emitting element that has passed through the opening, and is inclined with respect to the optical axis of the optical element. A solar cell composite light-emitting device that collects incident external light on the solar cell unit. The solar cell composite light-emitting device according to claim 1, wherein the optical element is a convex lens. The solar cell composite light-emitting device according to claim 1, wherein the optical element is disposed so that an optical axis center thereof penetrates a substantial center of the opening. A condensing lens is provided between the solar cell unit and the light emitting element,
The solar cell composite light-emitting device according to any one of claims 1 to 3, wherein the condenser lens is disposed so that a light beam emitted from the light-emitting element passes through the opening. A solar cell module disposed on a light emitting device having a plurality of or single light emitting elements,
A plurality of optical elements and a plurality of solar cell units are sequentially laminated,
Between adjacent solar cell units, openings formed at a predetermined pitch are provided,
The optical element is disposed so that the center of the optical axis passes through the opening, emits light from the light emitting element that has passed through the opening, and is inclined with respect to the optical axis of the optical element. A solar cell module that collects incident external light on the solar cell unit.

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