JP6397722B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device, and more particularly to a lighting device having a design display function.

  A lighting stand (desk lamp) used on a desk or the like is known. Also, a lighting stand equipped with a clock is known.

JP 2006-120580 A

  The present invention provides an illumination device having an illumination function and an image display function.

  An illumination device according to an aspect of the present invention includes a light source unit, a first region that receives light from the light source unit and is not provided with a color filter, and a second region that surrounds the first region and is provided with a color filter. A liquid crystal cell having a region, first and second polarizing elements sandwiching the liquid crystal cell and having openings at positions corresponding to the first region, and a case for housing the light source unit and the liquid crystal cell, respectively And a shade that is fixed to the case and onto which display light that passes through the second region is projected.

  ADVANTAGE OF THE INVENTION According to this invention, while providing an illumination function, an illuminating device provided with an image display function can be provided.

Sectional drawing of the illuminating device which concerns on 1st Embodiment of this invention. The side view of an illuminating device. 1 is a schematic diagram of a liquid crystal display device. Sectional drawing which shows an example of a liquid crystal display device. FIG. 6 is a schematic cross-sectional view illustrating the operation of the lighting device. The figure explaining an example of the image which an illuminating device displays. Sectional drawing of the illuminating device which concerns on 2nd Embodiment of this invention. Sectional drawing of the illuminating device which concerns on 3rd Embodiment of this invention. Sectional drawing of the illuminating device which concerns on 4th Embodiment of this invention.

  Hereinafter, embodiments will be described with reference to the drawings. However, it should be noted that the drawings are schematic or conceptual, and the dimensions and ratios of the drawings are not necessarily the same as the actual ones. Further, even when the same portion is represented between the drawings, the dimensional relationship and ratio may be represented differently. In particular, the following embodiments exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention depends on the shape, structure, arrangement, etc. of components. Is not specified. In the following description, elements having the same function and configuration are denoted by the same reference numerals, and redundant description will be given only when necessary.

[First Embodiment]
[1] Configuration of Lighting Device FIG. 1 is a cross-sectional view of a lighting device 10 according to the first embodiment of the present invention. FIG. 2 is a side view of the lighting device 10. The illumination device 10 includes a projection device 11 and a shade (projection member) 12 attached to the projection device 11.

  The projection device 11 includes a heat sink (heat absorption member) 20, a light source unit 21, a liquid crystal display device 30, a lens group (first lens L1 to fifth lens L5), and a case 22. In the following description of the structure, “upward” means the direction in which the light from the light source unit 21 travels.

  The light source unit 21 includes a substrate 21a and one or a plurality of light emitting elements 21b provided on the substrate 21a. As the light emitting element 21b, for example, a high luminance LED (Light Emitting Diode) is used, and specifically, a high luminance white LED or a high luminance RGB-LED can be used. The substrate 21a is composed of a circuit board provided with wiring for supplying power to the light emitting element 21b. Power is supplied to the substrate 21a via a power line (not shown). A heat sink 20 is provided on the bottom surface of the substrate 21a. The heat sink 20 has a function of absorbing or radiating heat.

  Above the light source part 21, the 1st lens L1 and the 2nd lens L2 are provided mutually spaced apart. The first lens L1 and the second lens L2 constitute a light source optical system. The light source optical system condenses light emitted from the light source unit 21 and refracts it into parallel light or a state close to parallel light. The first lens L1 is, for example, a plano-convex lens, and the second lens L2 is, for example, a biconvex lens, a plano-convex lens, or a Fresnel lens. The number and type of lenses constituting the light source optical system can be arbitrarily designed.

  A liquid crystal display device 30 is provided above the second lens L2. The liquid crystal display device 30 transmits light from the light source unit 21 and displays an image (design, etc.). A specific configuration of the liquid crystal display device 30 will be described later. Power is supplied to the liquid crystal display device 30 via a power line (not shown).

  Above the liquid crystal display device 30, a third lens L3, a fourth lens L4, and a fifth lens L5 are provided apart from each other. The third lens L3, the fourth lens L4, and the fifth lens L5 constitute a projection optical system. The projection optical system (the third lens L3, the fourth lens L4, and the fifth lens L5) emits part of the light transmitted through the liquid crystal display device 30 to the opening of the shade 12, and the liquid crystal display device 30. A part of the transmitted light is projected onto the shade 12. The third lens L3 is, for example, a biconvex lens, the fourth lens L4 is, for example, a plano-convex lens, and the fifth lens L5 is, for example, a meniscus lens. The number and type of lenses constituting the projection optical system can be arbitrarily designed.

  The light source unit 21, the liquid crystal display device 30, and the lens group (the first lens L <b> 1 to the fifth lens L <b> 5) are housed in the case 22 and supported and fixed by a support member provided in the case 22. The case 22 is formed so as to surround the element, and is provided on the heat sink 20. The case 22 is made of, for example, resin.

  The shade 12 is fixed to the end of the case 22 on the side in which the light from the light source unit 21 travels. The shade 12 is light transmissive and is made of, for example, acrylic resin, cloth, or glass. The shade 12 has a function as a screen on which a design displayed by the liquid crystal display device 30 is projected while suppressing transmission of illumination light. The shade 12 is formed in an umbrella shape around the case 22. Alternatively, the shade 12 has a cylindrical shape or a conical shape. In FIG. 2, as an example, the shade 12 has a wave shape, but may have another surface shape.

[2] Configuration of Liquid Crystal Display Device 30 Next, the configuration of the liquid crystal display device 30 will be described. FIG. 3 is a schematic diagram of the liquid crystal display device 30.

  The liquid crystal display device 30 includes a liquid crystal cell 31 and polarizing elements 32 and 33. In FIG. 3, the polarizing element 32, the liquid crystal cell 31, and the polarizing element 33 are illustrated separately, but actually, the polarizing elements 32 and 33 are bonded to the liquid crystal cell 31.

  The liquid crystal cell 31 includes an active area (display area) 31A that can display an image, and a drive circuit 34 that drives a pixel array included in the active area 31A. The active area 31A is provided with an illumination area 31B. The illumination region 31B is not provided with a color filter, and the illumination region 31B transmits the illumination light from the light source unit 21 as it is. The illumination area 31B is disposed at the center of the active area 31A, and the planar shape of the illumination area 31B is, for example, a circle. A color filter is provided in the active area 31A excluding the illumination area 31B, and a predetermined image is displayed.

  The polarizing elements 32 and 33 are provided so as to sandwich the liquid crystal cell 31. The polarizing elements 32 and 33 control the polarized light transmitted through the liquid crystal cell 31. The polarizing elements 32 and 33 are composed of circularly polarizing plates. The polarizing elements 32 and 33 respectively have openings 32A and 33A having the same size as the illumination area 31B. Thereby, the loss of the illumination light which passes through opening part 32A, 33A can be reduced.

  FIG. 4 is a cross-sectional view illustrating an example of the liquid crystal display device 30.

  The liquid crystal display device 30 includes a TFT substrate 41 on which switching elements, pixel electrodes, and the like are formed, a color filter substrate (CF substrate) 42 on which a color filter, a common electrode, and the like are formed and arranged to face the TFT substrate 41, and a TFT And a liquid crystal layer 43 sandwiched between the substrate 41 and the CF substrate. Each of the TFT substrate 41 and the CF substrate 42 is composed of a transparent substrate (for example, a glass substrate). For example, the TFT substrate 41 is disposed on the light source unit 21 side, and illumination light from the light source unit 21 enters the liquid crystal display device 30 from the TFT substrate 41 side. In FIG. 4, the TFT substrate 41 and the CF substrate 42 and members sandwiched between them correspond to the liquid crystal cell 31.

  The liquid crystal layer 43 is composed of a liquid crystal material sealed with a sealing material (not shown) for bonding the TFT substrate 41 and the CF substrate 42 together. In the liquid crystal material, the alignment of liquid crystal molecules is manipulated according to the electric field applied between the TFT substrate 41 and the CF substrate 42, and the optical characteristics change. For example, a VA (Vertical Alignment) mode is used as the liquid crystal mode, but other liquid crystal modes such as a TN (Twisted Nematic) mode and a homogeneous mode may be used.

  A plurality of switching elements 44 are provided on the liquid crystal layer 43 side of the TFT substrate 41. As the switching element 44, for example, a TFT (Thin Film Transistor) is used. The TFT 44 includes a gate electrode electrically connected to the scanning line, a gate insulating film provided on the gate electrode, a semiconductor layer (for example, an amorphous silicon layer) provided on the gate insulating film, and a semiconductor layer. A source electrode and a drain electrode provided apart from each other; The source electrode is electrically connected to the signal line.

  An insulating layer 45 is provided on the TFT 44. A plurality of pixel electrodes 46 are provided on the insulating layer 45. A contact plug 47 electrically connected to the pixel electrode 46 is provided in the insulating layer 45 and on the drain electrode of the TFT 44.

  A color filter 48 is provided on the liquid crystal layer 43 side of the CF substrate 42. The color filter 48 includes a plurality of coloring filters (coloring members), and specifically includes a plurality of red filters 48-R, a plurality of green filters 48-G, and a plurality of blue filters 48-B. A general color filter is composed of three primary colors of light, red (R), green (G), and blue (B). A set of three colors R, G, and B adjacent to each other is a display unit (pixel), and any single color portion of R, G, B in one pixel is a minimum called a subpixel (subpixel). It is a drive unit. The TFT 44 and the pixel electrode 46 are provided for each subpixel. In the following description, a subpixel is referred to as a pixel unless it is particularly necessary to distinguish between a pixel and a subpixel.

  A black matrix (light-shielding film) BM for light shielding is provided at the boundary between the red filter 48-R, the green filter 48-G, and the blue filter 48-B, and the boundary between the pixels (sub-pixels). For example, the black matrix BM is formed in a mesh shape. The black matrix BM is provided to shield unnecessary light between the coloring members and improve contrast.

  A common electrode 49 is provided on the color filter 48 and the black matrix BM. The common electrode 49 is formed in a planar shape over the entire display area of the liquid crystal display device 30.

  The polarizing elements 32 and 33 are provided so as to sandwich the TFT substrate 41 and the CF substrate 42. The polarizing elements 32 and 33 are composed of circularly polarizing plates, and specifically are composed of a linear polarizer and a quarter wavelength plate.

  The pixel electrode 46, the contact plug 47, and the common electrode 49 are composed of transparent electrodes, and for example, ITO (indium tin oxide) is used. As the insulating layer 45, a transparent insulating material is used, for example, silicon nitride (SiN).

[3] Operation of Lighting Device 10 Next, the operation of the lighting device 10 will be described. FIG. 5 is a schematic cross-sectional view for explaining the operation of the illumination device 10.

  When the illumination device 10 is turned on, the light source unit 21 emits illumination light. Further, the liquid crystal display device 30 displays a specific image in the active area 31A. At this time, no image is displayed in the illumination area 31B of the liquid crystal display device 30, and thus the illumination area 31B transmits the illumination light from the light source unit 21. The image displayed by the liquid crystal display device 30 is projected onto the projection region 51 of the shade 12 by the projection optical system provided in the illumination device 10.

  Specifically, as shown in FIG. 1, the light that has passed through the illumination area 31B and the light that has passed through the active area 31A around the illumination area 31B have different positions incident on the lens L3. For this reason, the light transmitted through the illumination region 31B is incident on the central portion of the lens L3, and then passes through the central portions of the lens L4 and the lens L5, which becomes illumination light.

  On the other hand, the light (display image) transmitted through the active region 31A is incident on the peripheral portion of the lens L3, and then passes through the lens L4 and the lens L5 and forms an image on the shade 12. As a result, an image is displayed in the projection area 51 of the shade 12.

  FIG. 6 is a diagram illustrating an example of an image (design) displayed by the illumination device 10. As shown in FIG. 6, the lighting device 10 can display various images on the shade 12. The lighting device 10 can also display information such as time on the shade 12.

[4] Effects As described in detail above, in the first embodiment, the illumination device 10 includes the light source unit 21 and the liquid crystal display device 30 that receives light from the light source unit 21. The liquid crystal display device 30 includes a liquid crystal cell 31 having an illumination area 31B in which no color filter is provided and an active area 31A that surrounds the illumination area 31B and in which a color filter is provided, and the illumination area 31B. Are provided with polarizing elements 32 and 33 each having an opening. The image transmitted through the active region 31A is displayed on the shade 12 through the projection optical system, and the illumination light transmitted through the illumination region 31B is emitted from the opening of the shade 12 through the projection optical system. .

  Therefore, according to 1st Embodiment, the illuminating device 10 which compatible the illumination function and the image display function is realizable. Moreover, the illuminating device 10 which can display various kinds of images or designs is realizable.

  Further, illumination light can be emitted using one light source unit, and an image can be displayed on the shade 12.

[Second Embodiment]
FIG. 7 is a cross-sectional view of the illumination device 10 according to the second embodiment of the present invention. A lens 52 for condensing illumination light is provided at the end of the shade 12 on the opening side. The lens 52 is fixed to the shade 12. As the lens 52, a convex lens is used, and more specifically, for example, a Fresnel lens is used in order to suppress the thickness of the lens.

  In the illuminating device 10 configured as described above, the illumination light transmitted through the Fresnel lens 52 has a spotlight shape. In the second embodiment, illumination light in a state different from that in the first embodiment can be generated. Note that the Fresnel lens 52 is disposed at the end of the shade 12 and thus does not affect the image displayed on the shade 12.

[Third Embodiment]
FIG. 8 is a cross-sectional view of the illumination device 10 according to the third embodiment of the present invention. The lighting device 10 further includes a light source unit 53 and a plurality of support members 54 that support the light source unit 53.

  The light source unit 53 emits illumination light toward the opening of the shade 12. The light source unit 53 includes a substrate 53a and one or a plurality of light emitting elements 53b provided on the substrate 53a. As the light emitting element 53b, for example, a high-brightness LED is used, and specifically, a high-brightness white LED or a high-brightness RGB-LED can be used. The substrate 53a is composed of a circuit board provided with wiring for supplying power to the light emitting element 53b. Power is supplied to the substrate 53a via a power line (not shown).

  For example, a wire is used as the support member 54. FIG. 8 shows two wires 54-1 and 54-2, but the number of wires can be arbitrarily set. One end of the wire 54 is fixed to the light source unit 53, and the other end of the wire 54 is fixed to the end of the shade 12. With the plurality of wires 54 configured in this manner, the light source unit 53 is arranged in the center of the shade 12 as viewed from the inside. In addition, the light source unit 53 is disposed below the shade 12 so as not to disturb display light for displaying an image on the shade 12.

  The liquid crystal cell 31 includes a color filter on the entire surface. Moreover, the polarizing elements 32 and 33 do not have an opening. That is, the liquid crystal display device 30 of the present embodiment is a general liquid crystal display device. The liquid crystal display device 30 displays an image over the entire active area (display area).

  In the illuminating device 10 configured as described above, the luminance of the illumination light can be improved by the light source unit 53 having the illumination function. In addition, since the light source part 53 is arrange | positioned under the shade 12, it does not affect the image displayed on the shade 12. FIG.

  Further, the light source unit 53 of the third embodiment may be applied to the first embodiment. In the case of this configuration, the light source unit 53 can supplement a portion where the luminance of the illumination light of the light source unit 21 is insufficient.

[Fourth Embodiment]
FIG. 9 is a cross-sectional view of the illumination device 10 according to the fourth embodiment of the present invention. The lighting device 10 further includes a reflector 55.

  The reflector 55 has a conical shape. A reflective film is provided on the inner surface of the reflector 55. A light source unit 53 is fixed to the upper part of the reflector 55. The lower part of the reflector 55 is fixed to the end of the shade 12. The reflector 55 reflects the illumination light from the light source unit 53. The configuration of the liquid crystal display device 30 according to the fourth embodiment is the same as that of the third embodiment.

  In the illuminating device 10 configured as described above, the luminance of the illumination light can be improved. Note that the light source unit 53 and the reflector 55 are disposed below the shade 12, and thus do not affect the image displayed on the shade 12.

  The lighting device 10 described in each of the above embodiments can be applied to, for example, a lighting stand (a table lamp).

  The present invention is not limited to the above embodiment, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Further, the above embodiments include inventions at various stages, and are obtained by appropriately combining a plurality of constituent elements disclosed in one embodiment or by appropriately combining constituent elements disclosed in different embodiments. Various inventions can be configured. For example, even if some constituent elements are deleted from all the constituent elements disclosed in the embodiments, the problems to be solved by the invention can be solved and the effects of the invention can be obtained. Embodiments made can be extracted as inventions.

  DESCRIPTION OF SYMBOLS 10 ... Illuminating device, 11 ... Projection device, 12 ... Shade, 20 ... Heat sink, 21 ... Light source part, 22 ... Case, 30 ... Liquid crystal display device, 31 ... Liquid crystal cell, 32, 33 ... Polarizing element, 34 ... Drive circuit, 41, 42 ... Substrate, 43 ... Liquid crystal layer, 44 ... Switching element, 45 ... Insulating layer, 46 ... Pixel electrode, 47 ... Contact plug, 48 ... Color filter, 49 ... Common electrode, 52 ... Lens, 53 ... Light source part 54 ... support member, 55 ... reflector.

Claims (5)

A light source unit;
A liquid crystal cell that receives light from the light source unit and has a first region not provided with a color filter; and a second region surrounding the first region and provided with a color filter;
First and second polarizing elements sandwiching the liquid crystal cell and each having an opening at a position corresponding to the first region;
A case for housing the light source unit and the liquid crystal cell;
A lighting device, comprising: a shade that is fixed to the case and onto which display light that passes through the second region is projected. The illumination apparatus according to claim 1, further comprising a projection optical system that projects display light from the second region onto the shade. The illumination apparatus according to claim 2, wherein the projection optical system includes a plurality of lenses and emits illumination light from the first region to an opening of the shade. 4. The illumination device according to claim 1, further comprising a lens that is disposed at an end of the shade opposite to the case and collects illumination light from the first region. 5. . The lighting device according to any one of claims 1 to 4, wherein the planar shape of the second region is a circle.