JP2015028975A - Solar cell composite light emitting device and solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both enhancement in the amount of output power from a solar battery, and enhancement in the observed brightness by a light-emitting element.SOLUTION: A solar battery composite light-emitting device includes a plurality of first condenser lenses, a plurality of solar cell units, a plurality of second condenser lenses, and a plurality or single light-emitting element laminated sequentially. The first condenser lenses condense external light to the solar cell units, and are arranged so that a non-condensing area not condensing the external light is formed between adjacent first condenser lenses. The second condenser lenses condense the light emitted from the light-emitting elements, and emit the light to the outside from the non-condensing area.

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 module 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 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 first condensing lenses, a plurality of solar cell units, a plurality of second condensing lenses, a plurality or a single light emitting element are sequentially laminated,
The first condensing lens condenses external light on the solar cell unit, and is arranged so that a non-condensing region that does not collect external light is formed between the adjacent first condensing lenses. And
The second condenser lens condenses the light emitted from the light emitting element and emits the light from the non-condensing region to the outside.

Furthermore, in the solar cell composite light emitting device according to the present invention,
The plurality of first condensing lenses and the non-condensing region are formed on a common optical sheet.

Furthermore, in the solar cell composite light emitting device according to the present invention,
The width of the non-condensing region has an upper limit in a range where the width of the first condensing lens is not narrower than the width of the solar cell unit, and a lower limit is a value D of the following conditional expression.
D = 2 (Δθ × f)
Where Δθ: parallelism of light emitted from the light emitting element
f: Focal length of the first condenser lens or the second condenser lens

Furthermore, in the solar cell composite light emitting device according to the present invention,
The non-condensing region has an optical function of scattering the light emitted from the second condenser lens and emitting it to the outside.

Moreover, 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 first condenser lenses, a plurality of solar cell units, and a plurality of second condenser lenses are sequentially laminated,
The first condensing lens condenses external light on the solar cell unit, and is arranged so that a non-condensing region that does not collect external light is formed between the adjacent first condensing lenses. And
The second condensing lens condenses the light beam emitted from the light emitting element and emits the light from the non-condensing region to the outside.

  By applying the solar cell composite light-emitting device of the present invention or the solar cell according to the present invention to the light-emitting device, both improvement of the output power amount in the solar cell and improvement of observation luminance by the light-emitting element are achieved. It becomes possible.

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. Sectional drawing which shows the comparative example of a solar cell composite display (light emission) apparatus Sectional drawing for demonstrating the width | variety of the non-condensing area | region 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. 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, the solar cell composite display device includes a first optical sheet 10, a solar cell unit 12, a second optical sheet 20, and a display pixel 22 as a light emitting element in the order in which external light enters. ing. In the figure, the space provided between the first optical sheet 10 and the second optical sheet 20 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.

  A plurality of first condenser lenses 11 are formed on the first optical sheet 10. The first condenser lens 11 is formed with a condensing region B for condensing external light. And between the adjacent 1st condensing lenses 11, the non-condensing area | region A which does not condense external light is formed. The non-light-collecting region A of the present embodiment is a flat portion having a flat surface on both surfaces of the first optical sheet 10. 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. The first condenser lens 11 forms an image on the solar cell unit 12 with the light condensed in the condensing region B. As described above, in the present embodiment, by using the first condenser lens 11, the efficiency of collecting external light is improved and the power generation performance is improved.

  The display pixel 22 emits image light and provides an image to the observer with the image light of the plurality of display pixels 22. In the present embodiment, since a plurality of second condensing lenses 21 are formed on the second optical sheet 20, simplification in manufacturing is achieved like the first condensing lens 11. Note that the first optical sheet 10 and the second optical sheet 20 can use optical elements known as microlens arrays or lenticular lenses.

  The image light emitted from the display pixel 22 is condensed by the second condenser lens 21, passes through the non-condensing region A provided between the first condenser lenses 11, and is emitted to the outside. At this time, the second condenser lens 21 is set so that all of the image light emitted from the display pixel 22 passes through the non-condensing region A, in other words, the image emitted from the display pixel 22. It is preferable to arrange so that the light does not pass through the condensing region B. With such an arrangement, it is possible to suppress loss of image light and improve luminance as a display device. The non-condensing region A may be provided with an optical function of scattering the light emitted from the second condenser lens 21 and emitting it to the outside. As such an optical function, unevenness is provided on the surface of the non-light-collecting area A on the outside light side, or an optical material that scatters light is embedded in the non-light-collecting area A of the first optical sheet 10. Can be considered. Since the non-condensing region A has such an optical function, the viewing angle of the image light can be increased.

  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. FIG. 2B is the same as FIG. 1, but the first condenser lens 11 and the second condenser lens 21 are each shown as a single unit for easy understanding of the comparison of the configuration with the front view.

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 1st condensing lens 11, the 2nd condensing lens 21, and the solar cell unit 12 are extended in the paper surface up-down direction. 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.

  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 the second condenser lens 21 is prepared at the pitch (interval) of the display pixels 22. An epoxy acrylate UV curable resin is supplied to the shaping mold roll from a supply device, and a 188 μm-thick PET film is stuck with a nip roll so as to sandwich the resin between the shaping mold roll. Thereafter, the second optical sheet 20 was formed by irradiating ultraviolet rays from the PET film side to cure the ultraviolet curable resin.

  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, a lens shape having a predetermined optical characteristic disposed at a pitch corresponding to the solar cell unit 12 portion of the patterned amorphous silicon solar cell, and a flat portion having a predetermined width disposed at a pitch corresponding to the opening 12a. A shaping roll having projections (projections) for forming 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, the first optical sheet 10 is formed by irradiating ultraviolet rays from the PET film side to cure the ultraviolet curable resin.

  Next, the display pixels 22 and the second condenser lens 21 portion of the second optical sheet 20 are superimposed on each other on the display portion where the display pixels 22 are formed, and are bonded with a thermosetting resin. Further, on the second optical sheet 20, the second condenser lens 21 portion of the second optical sheet 20 and the patterned amorphous silicon solar cell opening 12a are overlapped and bonded with a thermosetting resin.

  Next, the patterned amorphous silicon solar cell is positioned on the patterned amorphous silicon solar cell so that the opening 12a of the patterned amorphous silicon solar cell and the center of the first condenser lens 11 coincide with each other, and bonded with a thermosetting resin. A battery-combined display device is manufactured. In order to exhibit the light collecting function of the second condenser lens 21, an air layer is provided on the surface of the second condenser lens 21, or the second condenser lens 21 and the thermosetting resin have different refractive indexes. 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.

FIG. 3 shows a comparative example of a solar cell composite display device. This solar cell composite display device has a configuration in which the non-condensing region A is not provided between the first condensing lenses 11, and all the surfaces facing the external light side are condensing regions of the first condensing lens 11. B is formed. In such a case, all the external light incident on the solar cell composite display device is condensed on the solar cell unit 12 and can be expected to improve the power generation efficiency, but the display pixel is condensed by the second condenser lens 21. Most of the image light from 22 is regularly reflected on the surface of the first condenser lens 11, and provides an image with low brightness to the observer.

  On the other hand, in the case of the solar cell composite display (light emission) device according to the present embodiment, the external light is condensed on the solar cell unit 12 by the first condenser lens 11 as described in FIG. At the same time, by condensing the image light with the second condenser lens 2 and emitting the light from the non-condensing region A to the outside, both improvement of power generation efficiency by the solar cell and provision of an image with high luminance are achieved. It is possible.

  FIG. 4 is a cross-sectional view for explaining the width of the non-condensing region of the solar cell composite display device according to the embodiment of the present invention. Although the amount of power generation by the solar cell unit 12 can be increased by increasing the condensing area by the first condensing lens 11, in that case, the width D of the non-condensing region A needs to be narrowed. In that case, it is conceivable that the image light from the display pixel 22 is scattered by the first condenser lens 11 and the luminance of the image light is lowered. On the other hand, when the width D of the non-condensing region A is wide, it is conceivable that the condensing area becomes narrow and the power generation amount decreases.

Here, the coexistence of the power generation amount and the luminance in the solar cell composite display will be examined. In order to achieve both of these, it is important to narrow the width D of the non-condensing region A to the extent that image light is not scattered by the first condensing lens 11. Therefore, in this embodiment, paying attention to the parallelism Δθ of the image light emitted from the display device 22, the width D of the non-condensing region A is examined. Here, consider a case where the focal length of the second condenser lens 21 is f and the focal point is located on the surface (external light side) of the non-condensing region A. When the image light emitted from the display pixel 22 has a parallelism of ± Δθ, the blur radius d (the amount of movement of the focal position) in the non-condensing region A is expressed by the following conditional expression (1). Can do.
d≈Δθ × f (1)

By setting the blur radius d within the non-condensing region A, most of the image light condensed by the second condenser lens 21 can be emitted from the non-condensing region A. Light loss can be suppressed and luminance can be improved. Therefore, it is preferable that the lower limit of the width D of the non-condensing region A satisfies the following conditional expression (2) so that the non-condensing region A is out of focus.
D = 2d = 2 (Δθ × f) (2)

  In addition, when the surrounding part of the image light radiate | emitted from the 2nd condensing lens 21 is lost on the back surface of the solar cell unit 12, the focal distance f of the 2nd condensing lens 21 in conditional expression (2). Instead, the lower limit of the width D of the non-condensing region A can be defined by using the focal length f ′ of the first condensing lens 11.

  On the other hand, the upper limit of the non-condensing region A is preferably set so that the width of the condensing region B by the first condensing lens 11 is not narrower than the width of the solar cell unit 12. When the width of the condensing region B is smaller than the width of the solar cell unit 12, the width D of the non-condensing region A can be increased, but the area of the condensing region B decreases and the first condensing lens The light condensing effect by 11 will also fade.

In FIG. 2, the configuration in which each configuration of the solar cell composite display device is arranged in a line form on the front view has been described. However, each of the first condenser lens 11, the second condenser lens 21, the solar cell unit 12, and the like. Other forms can be adopted as the arrangement form of the structure. 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. 5, as can be seen from the front view of FIG. 5 (A), both the first condenser lens 11 and the solar cell unit 12 are formed in a lattice shape. The cross-sectional view shown in FIG. 5B is a cross-sectional view taken along the line DD in FIG. 5A and has the optical configuration described in FIGS. The 2nd condensing lens 21 becomes a form arrange | positioned at the island shape between the grating | lattices of the solar cell unit 12. FIG. In FIG. 5A, the second condenser lens 21 has a rectangular shape, but it is also possible to adopt a circular shape. The display pixel 22 is located on the back surface of each second condenser lens 21 and emits image light to provide an image to the observer.

  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. 5, as can be seen from the front view of FIG. 5 (A), the first condenser lens 11, the solar cell unit 12, and the second condenser lens 21 are all arranged in an island shape. The cross-sectional view shown in FIG. 5B is a cross-sectional view taken along the line DD, and has the optical configuration described in FIGS. The 2nd condensing lens 21 becomes a form arrange | positioned at the island shape between the grating | lattices of the solar cell unit 12. FIG. In FIG. 6A, the first condenser lens 11 and the second condenser lens 21 are both rectangular, but a circular shape can also be adopted. The display pixel 22 is located on the back surface of each second condenser lens 21 and emits image light to provide an image to the observer.

  As described above, the solar cell composite display device according to the present embodiment has been described with reference to FIGS. 1 to 6. However, according to the solar cell composite display device according to the present invention, the output power amount of the solar cell can be reduced. It becomes possible to achieve both improvement and improvement of observation luminance by the light emitting element.

  Although FIGS. 1 to 6 illustrate the case where the present invention is applied to a display device, the present invention can be applied not only to the display device but also to various light emitting devices having light emitting elements such as a lighting device. Furthermore, the present invention can also be provided as a solar cell module in which the first condenser lens 11, the second condenser lens 21, 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. It is important that the solar cell module and the light emitting device are appropriately joined by appropriately aligning the second condenser lens 21 provided on the solar cell side, the light emitting element (display pixel 22) on the light emitting device side, and both. It is. In addition, when applying to an illuminating device, the light emitting element does not need to be separated into a plurality on the back surface of the second optical sheet 20, and it is considered that the light emitting element is formed by one (single) light emitting element. In this case, the light irradiated between the second condenser lenses 21 is emitted, but the light emitted to the second condenser lenses 21 is effectively emitted.

  FIG. 7 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 10 ... 1st optical sheet 11 ... 1st condensing lens 12 ... Solar cell unit 12a ... Opening part 20 ... 2nd condensing lens 22 ... Display pixel (light emitting element)
A ... Non-condensing region B ... External light condensing region 30 ... Display unit (light emitting unit)
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 first condensing lenses, a plurality of solar cell units, a plurality of second condensing lenses, a plurality or a single light emitting element are sequentially laminated,
The first condensing lens condenses external light on the solar cell unit, and is arranged so that a non-condensing region that does not collect external light is formed between the adjacent first condensing lenses. And
The said 2nd condensing lens condenses the light radiate | emitted from the said light emitting element, and radiate | emits it outside from the said non-condensing area | region. The solar cell composite light-emitting device according to claim 1, wherein the plurality of first condensing lenses and the non-condensing region are formed on a common optical sheet. The width of the non-condensing region has an upper limit in a range where the width of the first condensing lens is not narrower than the width of the solar cell unit, and a lower limit is a value D of the following conditional expression. The solar cell composite light-emitting device according to claim 2.
D = 2 (Δθ × f)
Where Δθ: parallelism of light emitted from the light emitting element
f: Focal length of the first condenser lens or the second condenser lens The solar cell combined light emission according to any one of claims 1 to 3, wherein the non-condensing region has an optical function of scattering light emitted from the second condenser lens and emitting the light to the outside. apparatus. A solar cell module disposed on a light emitting device having a plurality of or single light emitting elements,
A plurality of first condenser lenses, a plurality of solar cell units, and a plurality of second condenser lenses are sequentially laminated,
The first condensing lens condenses external light on the solar cell unit, and is arranged so that a non-condensing region that does not collect external light is formed between the adjacent first condensing lenses. And
The second condensing lens condenses the light beam emitted from the light emitting element and emits the light from the non-condensing region to the outside.

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