WO2016060052A1 - 照明装置、表示装置、及び照明装置の製造方法 - Google Patents
照明装置、表示装置、及び照明装置の製造方法 Download PDFInfo
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- WO2016060052A1 WO2016060052A1 PCT/JP2015/078569 JP2015078569W WO2016060052A1 WO 2016060052 A1 WO2016060052 A1 WO 2016060052A1 JP 2015078569 W JP2015078569 W JP 2015078569W WO 2016060052 A1 WO2016060052 A1 WO 2016060052A1
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- light
- plate
- light guide
- guide plate
- reflecting portion
- Prior art date
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
Definitions
- the present invention relates to a lighting device, a display device, and a method for manufacturing the lighting device.
- liquid crystal panels are widely used as display panels for displaying images.
- this type of display device is equipped with a backlight device (illumination device) that supplies light to the liquid crystal panel.
- a light guide plate made of a transparent plate-like member, and a light source (for example, LED) arranged in a shape facing the end face of the light guide plate.
- the provided edge light type (or side light type) is known.
- Light emitted from the light source of the backlight device enters the light guide plate from the end surface of the light guide plate facing the light source (hereinafter referred to as a light incident surface). Then, the light is emitted as planar light from the front plate surface (hereinafter referred to as a light emitting surface) while propagating through the light guide plate.
- Such an edge light type backlight device can be made thinner than other types (for example, a direct type). Therefore, an edge light type backlight device is preferably used in a display device that is highly demanded to be thin, such as a portable information terminal.
- a light guide plate is arranged inside a frame-shaped mold (frame).
- the present invention has been completed based on the above-described circumstances, and aims to contribute to narrowing the frame while suppressing a decrease in luminance.
- the illumination device is a light guide plate composed of a light source and a plate-like member, which is composed of an end face of the plate-like member, faces the light source, and receives light emitted from the light source.
- a light incident surface, an opposite end surface composed of an end surface of the plate member located on the opposite side of the light incident surface, and one plate surface of the plate member, and light incident from the light incident surface is A light guide plate having a light emission surface to be emitted; and a light reflection portion that is formed in close contact with the opposite end surface and reflects light traveling from the inside of the light guide plate toward the opposite end surface.
- produce among the end surfaces of a light-guide plate it leaks out from an opposite end surface by reflecting in a light reflection part. It is possible to reduce the amount of light and suppress a decrease in luminance of the lighting device. Furthermore, the amount of light that leaks from the opposite end face and travels toward the light exit surface can be reduced, and the width of the light shielding layer for shielding the light that travels toward the light exit surface is reduced, thereby contributing to narrowing the frame. be able to.
- the light guide plate may have at least a curved end surface having a curved planar shape, and the light reflecting portion may be formed on the curved end surface.
- a gap is set between the light guide plate and a member assembled to the light guide plate in consideration of dimensional errors, assembly tolerances, and the like.
- the clearance set for the curved end surface is generally larger than the clearance set for the end surface where the planar shape is a straight line in consideration of distortion of the molded product. I do not get.
- the light guide plate is formed with a through-hole penetrating in the thickness direction of the light guide plate so that light directed from the inside of the light guide plate toward the through-hole is in close contact with the inner peripheral end surface of the through-hole.
- An inner peripheral end face side light reflecting portion that reflects may be formed.
- the portion of the light guide plate located on the opposite side of the light incident surface with respect to the through hole is directly incident on the light incident surface because the through hole is interposed between the light incident surface and the light incident surface. It will be difficult to reach.
- the light reflected by the light reflecting portion and the inner peripheral end face side light reflecting portion can be emitted from the portion, and the occurrence of a situation where the luminance of the portion is reduced can be suppressed. it can.
- the light guide plate is configured to be in close contact with the other plate surface of the plate-like member and direct light from the inside of the light guide portion toward the other plate surface toward the light emitting surface side.
- the other plate surface side light reflecting portion to be reflected may be formed, and the opposite end surface may be an inclined surface inclined with an obtuse angle with respect to the other plate surface.
- the other plate surface side light reflecting portion and the light reflecting portion can be easily formed in a lump, which is preferable.
- the area of the opposite end surface can be increased compared to the configuration in which the opposite end surface is perpendicular to the other plate surface, opposite to the light reflecting portion. By increasing the contact area with the end surface, it is possible to make the light reflecting portion difficult to peel off.
- the light reflecting portion extends over an end portion on the opposite end surface side of the light exit surface, the opposite end surface, and an end portion on the opposite end surface side of the other plate surface.
- it may be formed in a letter U in sectional view.
- sink marks or scratches on the light guide plate that can cause bright spot defects are likely to occur at the end of the light exit surface and the end of another plate surface. By covering sink marks and scratches with the light reflecting portion, the occurrence of bright spot defects can be suppressed.
- the lighting device further includes a resin frame made of a synthetic resin having light reflectivity and extending so as to surround at least the light source and the light guide plate so as to face the end face of the light guide plate. May be.
- the light reflection portion In the configuration including the resin frame, if the light reflection portion is not provided, the light leaking from the opposite end surface can be reflected by the resin frame and incident on the inside of the light guide plate, but is reflected by the resin frame. A part of the light easily leaks to the light exit surface side of the lighting device.
- the light toward the opposite end surface is reflected by the light reflecting portion, so that it is preferably reflected toward the inside of the light guide plate and the gap between the resin frame and the opposite end surface. It is possible to reduce light leaking to the light exit surface side through the.
- a metal frame that is made of metal having a light reflectance lower than that of the light reflecting portion and is provided so as to accommodate at least the light source and the light guide plate so as to face the end surface of the light guide plate. Furthermore, you may provide.
- the lighting device further includes a light-transmitting packaging member for assembling these members by collectively wrapping at least the light source and the light guide plate in a manner covering the light emitting surface and the opposite end surface. It may be.
- the light reflecting portion if the light reflecting portion is not provided, the light that exits from the opposite end surface and passes through the packaging member and leaks outward is reflected by the light reflecting portion to be the light exit surface.
- the luminance of the lighting device can be preferably improved.
- the display device includes the illumination device and a display panel that performs display using light from the illumination device.
- the display panel may be a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
- a housing member that houses the illumination device and the display panel, the housing member being substantially box-shaped and having a side wall facing the end surface of the light guide plate. Furthermore, you may provide.
- the manufacturing method of the illuminating device which concerns on this invention is a manufacturing method of the illuminating device which manufactures the said illuminating device, Comprising: The light reflection part formation process which forms the said light reflection part, In the said light reflection part formation process, The plurality of light guide plates are arranged in parallel in the thickness direction of the plurality of light guide plates, and the opposite end surfaces are arranged in a state of being flush with each other, and have light reflectivity to the opposite end surfaces of the plurality of light guide plates. By forming a coating film containing particles or a metal thin film having light reflectivity, the light reflecting portion may be formed in a lump for the plurality of light guide plates. According to such a method, a light reflection part can be formed suitably.
- the manufacturing method of the illuminating device which concerns on this invention is a manufacturing method of the illuminating device which manufactures the said illuminating device, Comprising: The said light reflection part formation process which forms the said light reflection part, In the said light reflection part formation process, The light reflecting portion and the other plate surface side light reflecting portion may be collectively formed by screen printing using a flexible screen. According to such a method, a light reflection part can be formed suitably.
- the method for manufacturing a lighting device is a method for manufacturing the lighting device, including a light reflecting portion forming step for forming the light reflecting portion, wherein the light reflecting portion forming step includes a plurality of the light guides.
- An optical plate and a plurality of protective plate-like members that protect the plate surface of the light guide plate are alternately arranged in the plate thickness direction without gaps, and an end surface of the protective plate-like member is the opposite end surface of the light guide plate Arranged in such a manner as to be a position retracted further inward, among the light emitting surfaces of the plurality of light guide plates, an end on the opposite end surface side, the opposite end surfaces of the plurality of light guide plates, and a plurality of the light guides
- a coating film containing particles having light reflectivity with respect to the end portion on the opposite end face side of the other plate surface of the light plate, or a metal thin film having light reflectivity, the light reflection portion is formed.
- a plurality of the light guide plates may be collectively formed.
- FIG. 1 is an exploded perspective view of a liquid crystal display device according to Embodiment 1.
- FIG. Sectional view along the longitudinal direction of the liquid crystal display device (sectional view taken along line AA in FIG. 1)
- Sectional view along the short direction of the liquid crystal display device (sectional view taken along line BB in FIG. 1) Schematic sectional view showing the sectional structure of the liquid crystal panel Partial sectional view of the liquid crystal display device shown in FIG.
- Plan view of lighting device shown with optical members omitted
- Explanatory drawing which shows typically the aspect which forms a light reflection part in a light reflection part formation process.
- Explanatory drawing which shows typically the state in which the light reflection part was formed in FIG. Sectional drawing of the liquid crystal display device which concerns on Embodiment 2.
- FIG. Sectional view along the longitudinal direction of the liquid crystal display device (sectional view taken along line AA in FIG. 1)
- Sectional view along the short direction of the liquid crystal display device (sectional view taken along line BB in FIG. 1)
- the top view of the illuminating device which concerns on Embodiment 3 (an optical member is omitted and shown)
- the top view of the illuminating device which concerns on Embodiment 4 (an optical member is omitted and shown)
- the top view of the illuminating device which concerns on Embodiment 5 (an optical member is omitted and shown)
- the top view of the illuminating device which concerns on Embodiment 6 (an optical member is omitted and shown) 13 is a partial cross-sectional view of a liquid crystal display device including the illumination device shown in FIG. 13 (cross-sectional view corresponding to line CC in FIG. 13).
- FIG. 7 Partial sectional view of a liquid crystal display device according to Embodiment 7 Explanatory drawing which shows typically the aspect which forms a light reflection part in a light reflection part formation process. Explanatory drawing which expands and shows the process in which the light reflection part is formed in FIG. Explanatory drawing which shows typically the state in which the light reflection part was formed in FIG. Explanatory drawing which shows typically the aspect which forms a light reflection part in the light reflection part formation process of Embodiment 8. FIG. Explanatory drawing which shows the process in which the light reflection part is formed in FIG. Partial sectional drawing which shows the light-guide plate and light reflection part which concern on Embodiment 9. FIG. Partial sectional drawing which shows the light-guide plate and light reflection part which concern on Embodiment 10. FIG.
- Embodiment 1 of the present invention will be described with reference to FIGS.
- the backlight device 13 and the liquid crystal display device 10 including the backlight device 13 are illustrated.
- an X axis, a Y axis, and a Z axis are shown.
- the backlight device 13 and the like will be described with the upper side shown in FIG. 3 as the front side and the lower side in the figure as the back side.
- FIG. 1 is an exploded perspective view of the liquid crystal display device 10 according to the first embodiment.
- the liquid crystal display device 10 has a vertically long rectangular shape as a whole.
- the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 having a front side plate surface as a display surface 11D for displaying an image and a back side plate surface as an opposite surface 110, and a display surface with respect to the liquid crystal panel 11.
- 11D and a cover panel 12 arranged opposite to the liquid crystal panel 11, and arranged to face the opposite surface 110 with respect to the liquid crystal panel 11 (on the side opposite to the cover panel 12 side) and supply light to the liquid crystal panel 11
- a backlight device (illumination device) 13.
- the liquid crystal display device 10 includes a housing 14 that houses the cover panel 12, the liquid crystal panel 11, and the backlight device 13.
- the space behind the backlight device 13 includes a board (not shown) such as a control board for controlling the driving of the liquid crystal panel 11 and an LED driving board for supplying driving power to the LEDs 22.
- a battery 19 and the like are accommodated (see FIGS. 2 and 3).
- the cover panel 12 and the housing 14 constitute the appearance of the liquid crystal display device 10. 2 and 3, the housing 14 has a cover panel placement surface 14a formed by cutting out the inner peripheral surface of the opening. It is fixed to the cover panel mounting surface 14a through an adhesive layer (not shown) so as to close the opening.
- the liquid crystal display device 10 is a portable information terminal (for example, a mobile phone, a smartphone, a tablet personal computer), an in-vehicle information terminal (for example, a stationary car navigation system, a portable car navigation system), a portable game machine, or the like. It is used for various electronic devices. For this reason, the screen sizes of the liquid crystal panel 11 and the cover panel 12 constituting the liquid crystal display device 10 are about several inches to several tens of inches, and are generally classified as small or medium-sized. In the present embodiment, each member and the dimension between the members are illustrated for a screen size of about 5 inches.
- the liquid crystal panel 11 includes a pair of transparent (translucent) glass substrates 11a and 11b having a rectangular shape in plan view, and an intervening space between the substrates 11a and 11b. And a liquid crystal layer 11e containing liquid crystal molecules, which are substances whose optical characteristics change with application of an electric field, and the substrates 11a and 11b are maintained by the sealing material 11k while maintaining a gap corresponding to the thickness of the liquid crystal layer 11e. It is pasted together.
- Each of the pair of substrates 11a and 11b has a thickness of about 0.2 mm, for example, so that the liquid crystal panel 11 is thinned.
- polarizing plates 11c and 11d are attached to the outer surface sides of both the substrates 11a and 11b, respectively.
- each color such as R (red), G (green), B (blue), etc.
- a large number of color filters 11h are arranged in parallel so as to overlap each pixel electrode 18 on the array substrate 11b side in a plan view.
- a substantially lattice-shaped black matrix 11i for preventing color mixture is formed between the colored portions constituting the color filter 11h.
- the black matrix 11i is arranged so as to overlap the above-described gate wiring and source wiring in a plan view.
- a solid counter electrode 11j facing the pixel electrode 18 on the array substrate 11b side is provided on the surface of the color filter 11h and the black matrix 11i.
- one display pixel which is a display unit by a set of three colored portions of R (red), G (green), and B (blue) and three pixel electrodes 18 facing them. Is configured.
- the display pixel includes a red pixel having an R colored portion, a green pixel having a G colored portion, and a blue pixel having a B colored portion.
- the pixels of each color constitute a pixel group by being repeatedly arranged along the row direction (X-axis direction) on the plate surface of the liquid crystal panel 11, and this pixel group constitutes the column direction (Y-axis direction). Many are arranged side by side.
- alignment films 11l and 11m for aligning liquid crystal molecules contained in the liquid crystal layer are formed on the inner surfaces of both the substrates 11a and 11b, respectively.
- a light shielding layer 32 is formed on the inner surface side of the non-display area on the outer peripheral edge side of the screen where no image is displayed in the CF substrate 11a.
- the light shielding layer 32 is formed of the same material as the black matrix 11i described above. In other words, the light shielding layer 32 is black and can be said to be a light absorbing portion having light absorptivity.
- the light shielding layer 32 is formed in a region extending in a frame shape (frame shape) along the outer peripheral edge of the CF substrate 11a, and an image surrounded by the light shielding layer 32 in the liquid crystal panel 11 is visible through the cover panel 12. Is a display unit (active area). The configuration related to the light shielding layer 32 will be described later.
- the backlight device (illumination device) 13 has a vertically long rectangular shape in plan view, like the liquid crystal panel 11 as a whole.
- the backlight device 13 includes an LED (Light Emitting Diode) 22 that is a light source, an LED substrate (light source substrate) 23 on which the LED 22 is mounted, a light guide plate 24 that guides light from the LED 22, and a light guide plate.
- LED Light Emitting Diode
- the backlight device 13 is a so-called edge light system in which the LEDs 22 are unevenly distributed at the outer peripheral end of the liquid crystal panel 11.
- the components of the backlight device 13 will be described sequentially.
- the LED (light source) 22 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the plate surface of the LED substrate 23, as shown in FIG.
- the LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used.
- the resin material that seals the LED chip is dispersed and blended with a phosphor that emits a predetermined color when excited by the blue light emitted from the LED chip, and generally emits white light as a whole. It is said.
- the LED 22 is a so-called side-emitting type in which a side surface adjacent to a mounting surface with respect to the LED substrate 23 is a light emitting surface 22a.
- the LED 22 emits light having a predetermined spread (directivity) around the optical axis L1 from the light emitting surface 22a.
- the optical axis L1 of the emitted light is substantially perpendicular to the central portion of the light emitting surface 22a. For this reason, among the light from the LED 22, the light traveling toward the end surfaces 24 d, 24 e, 24 f of the light guide plate 24 described later is larger on the opposite end surface 24 d than the end surfaces 24 e, 24 f.
- the light incident surface 24a is provided only at one place among the four outer peripheral end surfaces.
- the end surface 24d on the other short side on the opposite side of the light incident surface 24a faces an inner peripheral surface 27a of a frame 27 described later. This is referred to as an opposite end face 24d.
- the opposite end surface 24d can also be said to be a light source non-opposing end surface on which the LEDs 22 are not disposed in a manner facing the opposite end surface 24d.
- end faces 24e those shown on the left side of FIG. 3 are called end faces 24e, and those shown on the right side of FIG. 3 are called end faces 24f.
- the end surface 24e and the end surface 24f can also be said to be light source non-facing end surfaces like the opposite end surface 24d.
- a light reflecting portion 34 is formed on the opposite end surface 24d, end surface 24e, and end surface 24f. The configuration related to the light reflecting section 34 will be described later.
- the front side plate surface (one plate surface) 24b of the light guide plate 24 is a light emitting surface 24b for emitting light toward the liquid crystal panel 11 as shown in FIGS. From the light emitting surface 24b, light spread in a planar shape toward the liquid crystal panel 11 side is emitted. Light directed from the inside of the light guide plate 24 toward the plate surface 24c is in close contact with the plate surface 24c on the plate surface (other plate surface) 24c on the back side of the light guide plate 24 on the opposite side of the light emitting surface 24b. Is formed on the other plate surface side light reflecting portion 34 that reflects the light toward the light emitting surface 24b side. The other plate surface side light reflecting portion 34 has a white dot pattern and can reflect light while scattering.
- the light emission is suppressed at a portion close to the LED 22 and the light emission is suppressed at a portion far from the LED 22 where the amount of light existing in the light guide plate 24 is relatively small, and thus the light emitted from the light emitting surface 24b. It is assumed that the uneven distribution is less likely to be uneven. Furthermore, the plate surface 24c on the back side of the light guide plate 24 is covered with a light reflection sheet 26 described later.
- the optical sheet 25 is placed on the light emitting surface 24b of the light guide plate 24, and is disposed between the liquid crystal panel 11 and the light guide plate 24.
- the light emitted from the light guide plate 24 is transmitted and emitted toward the liquid crystal panel 11 while giving a predetermined optical action to the transmitted light.
- the optical sheet 25 is formed by laminating sheets such as a so-called lens sheet, a diffusion sheet, and a reflective polarizing sheet.
- the light reflecting sheet 26 is arranged so as to cover the back surface 24 c of the light guide plate 24.
- the light reflecting sheet 26 is made of a sheet material having excellent light reflectivity.
- the light reflecting sheet 26 reflects the light propagating through the light guide plate 24 so as to be directed to the front side (light emitting surface 24b).
- the light reflecting sheet 26 has a function of complementing the function of the other plate surface side light reflecting portion 34.
- the light reflection sheet 26 has a rectangular shape that is substantially the same as the outer shape of the frame 27 to be described later in plan view, and covers the gap 33 between the light guide plate 24 and the frame 27 from the back side. It is arranged.
- the frame (resin frame) 27 has a vertically long rectangular frame shape as a whole, and its outer shape is set to be approximately the same as the outer diameter of the liquid crystal panel 11 in plan view.
- the frame 27 has an outer peripheral end portion (a portion where the light shielding layer 32 is formed) of the liquid crystal panel 11 placed on the upper surface of the frame 27 via a panel adhesive tape 28.
- the panel 11 can be supported from the back side over the entire circumference.
- the frame 27 accommodates the LEDs 22, the light guide plate 24, and the optical sheet 25 inside, and the light reflecting sheet 26 is attached to the lower surface of the frame 27 via the light reflecting sheet adhesive tape 29. With such a configuration, the frame 27 has a function of fixing the constituent members of the backlight device 13 to each other.
- the inner diameter of the frame 27 is between the light guide plate 24 and the light guide plate 24 in a state where the light guide plate 24 is assembled in consideration of the dimensional tolerance (about ⁇ 0.1%) of the light guide plate 24 and the expansion due to the temperature change of each material.
- dimensional tolerance about ⁇ 0.1%) of the light guide plate 24 and the expansion due to the temperature change of each material.
- the light reflecting portion 34 is formed so as to be in close contact with at least the opposite end surface 24d, and is configured to reflect light traveling from the inside of the light guide plate 24 toward the opposite end surface 24d.
- the light reflecting portion 34 is formed in a solid shape over the entire area of the opposite end surface 24d.
- the light reflecting portion 34 is exemplified not only on the opposite end surface 24d of the light guide plate 24 but also on the end surface 24e and the end surface 24f.
- the light reflecting portion 34 is not formed on the light incident surface 24a that is the light source facing end surface, but is formed on the opposite end surface 24d, end surface 24e, and end surface 24f that are non-light source facing end surfaces. According to such a configuration, in addition to the light leaking from the opposite end face 24d, the amount of light leaking from the end face 24e and the end face 24f can be reduced, thereby further reducing the amount of light leaking from the light guide plate 24. Can do.
- the backlight device 13 is shown in a form in which the optical sheet 25 is omitted.
- the light reflecting portion 34 is white having excellent light reflectivity, and is applied directly to the opposite end face 24d, end face 24e, and end face 24f with white ink, which is a paint containing particles having light reflectivity. It consists of a coating film to be formed.
- the light reflecting portion 34 is configured to diffuse and reflect light from the inside of the light guide plate 24 toward the end surfaces 24 d, 24 e, and 24 f toward the inside of the light guide plate 24.
- the light reflecting portion 34 is set to a thickness of about 5 to 50 ⁇ m according to the light reflectance of the paint.
- the light reflecting portion 34 is set to have a light reflectance equal to or higher than that of the other plate surface side light reflecting portion 34 formed on the plate surface 24 c on the back side of the light guide plate 24.
- the thickness dimension of the light reflecting portion 34 is set to be equal to or larger than the thickness dimension of the other plate surface side light reflecting portion 34,
- the formation area per unit area of the light reflection part 34 is set to be equal to or larger than the formation area per unit area of the light reflection part 34 on the other plate surface side.
- the light reflectance of the light reflecting portion 34 is preferably set to be equal to or higher than the light reflectance of the frame 27. In each figure, the light reflecting portion 34 and the other plate surface side light reflecting portion 34 are shown with dimensions larger than the actual thickness dimensions in order to clearly show them.
- the light shielding layer 32 covers the sealing material 11k from the front side, and is configured to shield light directed toward the display surface 11D out of light reflected by the light reflecting portion 34 described later.
- the light shielding layer 32 is formed so that the inner end 32a thereof is in a position retracted inward by about 0.3 mm from each of the opposite end surface 24d, end surface 24e, and end surface 24f (D1 ⁇ 0.3 mm). Further, the light shielding layer 32 is formed such that the outer end 32b thereof is positioned so as to overlap the frame 27 (in this embodiment, the position overlapping the outer peripheral end of the frame 27).
- the light shielding layer 32 covers the gap 33 formed between the frame 27 and the opposite end surface 24d (light reflecting portion 34), thereby shielding light from the gap 33 toward the surface side and the light emitting surface.
- the light directly diffused from the end of the light guide plate 24 out of the light diffusely reflected by the light reflecting portion 34 is shielded.
- the backlight frame from the end surface of the light guide plate 24 to the outer peripheral end of the backlight device 13 of the backlight device 13 is a backlight frame
- the size of the backlight frame up to the outer peripheral edge of the frame 27 can be about 0.8 mm (D2 ⁇ 0.8 mm).
- the thickness dimension of the side wall portion of the casing 14 is about 1.5 mm.
- the LED (light source) 22 when the LED (light source) 22 is driven, light is emitted from the light emitting surface 22a, and the light enters the light guide plate 24 from the light incident surface 24a.
- the incident light travels in the light guide plate 24 toward the opposite end surface 24d side while repeating reflection between the front plate surface 24b and the back plate surface 24c.
- the light incident on the light guide plate 24 from the light incident surface 24a most of the light is emitted from the light emitting surface 24b before reaching the opposite end surface 24d, but a part of the light is emitted from the opposite end surface 24d. Proceed toward.
- the light reflecting portion 34 Most of the light traveling toward the opposite end surface 24d is reflected by the light reflecting portion 34, and again travels in the light guide plate 24 while being repeatedly reflected between the front plate surface 24b and the back plate surface 24c. The light exits from the light exit surface 24b. Of the light reflected by the light reflecting portion 34, a part of the light is emitted from the end portion on the opposite end surface 24 d side of the light emitting surface 24 b of the light guide plate 24 and absorbed by the light shielding layer 32. In addition, some of the light that travels in the light guide plate 24 and reaches the opposite end surface 24 d is transmitted through the light reflecting portion 34 and directed toward the inner peripheral surface 27 a of the frame 27.
- the screen brightness of the backlight device 13 that does not include the light reflecting section 34 is about 500 cd / m 2, but in this embodiment, the screen brightness of the backlight device 13 is about 550 cd / m 2, The effect that the screen brightness is improved as compared with the backlight device that does not include the light reflecting portion 34 was observed.
- the manufacturing method of the backlight device 13 includes a light reflecting portion forming step of forming the light reflecting portion 34 on the opposite end face 24d, the end face 24e, and the end face 24f.
- the light reflecting portion forming step may be performed before or after forming the other plate surface side light reflecting portion 34 on the plate surface 24c on the back side of the light guide plate 24.
- a plurality of light guide plates 24 are arranged in parallel in the thickness direction, and the opposite end surface 24d, end surface 24e, and end surface 24f are arranged in a manner such that they are flush with each other.
- the protective plate-like members 42 that protect the plate surfaces 24b and 24c are arranged on both sides of the plurality of light guide plates 24 arranged in parallel without any gap.
- the protective plate-like member 42 has a plate surface having the same shape and size as the front plate surfaces 24 b and 24 c of the light guide plate 24, and is arranged in such a manner that the plate surface overlaps the plate surfaces 24 b and 24 c of the light guide plate 24.
- each end face thereof is arranged in a manner that is flush with the end faces 24a, 24d, 24e, and 24f of the light guide plate.
- a coating 44 containing particles having light reflectivity is applied to the opposite end surfaces 24d of the plurality of light guide plates 24 arranged in parallel by spray coating.
- the light guide plate 24 is placed in a posture in which the opposite end surface 24d extends in the horizontal direction, and the coating material 44 is discharged from the nozzle 43 of the spray device in the form of a spray over the entire area of the opposite end surface 24d forming a flush surface.
- the coating 44 containing light-reflective particles is applied also to the end surface 24e and the end surface 24f.
- the coating film 46 is collectively formed on the plurality of light guide plates 24.
- spray coating is excellent in simplicity, but is not limited thereto, and may be dispenser, screen printing, pad printing, gravure printing, ink jet printing, brush coating, roller coating, or the like.
- the thickness dimension of the light guide plate 24 is small, it is easy to form the light reflecting portion 34 with a uniform film thickness, and the light emitting portion 24b of the light guide plate 24 and the back side Unintentional formation of the light reflecting portion 34 on the plate surface 24c can be suppressed.
- the backlight device 13 is an LED 22 and a light guide plate 24 composed of a plate-like member, which is composed of an end surface 24a of the plate-like member, faces the LED 22, and light emitted from the LED 22 is emitted. It is composed of an incident light incident surface 24a, an opposite end surface 24d composed of an end surface 24d of a plate-like member located on the opposite side of the light incident surface 24a, and one plate surface 24b of the plate-like member, and is incident from the light incident surface 24a.
- a light guide plate 24 having a light emitting surface 24b from which the emitted light is emitted, and a light reflecting portion 34 that is formed in close contact with at least the opposite end surface 24d and reflects light traveling from the inside of the light guide plate 24 toward the opposite end surface 24d. And comprising.
- the light reflection portion 34 is formed so as to be in close contact with the opposite end surface 24d where light leakage is likely to occur among the end surfaces 24a, 24d, 24e, and 24f of the light guide plate 24. It is possible to reduce the amount of light leaking from the opposite end surface 24d by being reflected at 34, and to suppress a decrease in luminance of the backlight device 13. Further, the amount of light leaking from the opposite end surface 24d and traveling toward the light exit surface 24b can also be reduced, and the width of the light shielding layer 32 for shielding the light traveling toward the light exit surface 24b is reduced, thereby narrowing the frame. Can contribute.
- the backlight device 13 is made of a synthetic resin having light reflectivity, and at least the LED 22 and the light guide plate 24 are disposed so as to face the end faces 24a, 24d, 24e, and 24f of the light guide plate 24.
- a frame 27 extending in a surrounding shape is provided.
- the light leaking from the opposite end surface 24d can be reflected by the frame 27 and incident on the inside of the light guide plate 24. Part of the light reflected by the light is likely to leak to the light exit surface 24b side of the backlight device 13.
- the light toward the opposite end surface 24d is reflected by the light reflecting portion 34, so that it is preferably reflected toward the inside of the light guide plate 24 and at the opposite end surface 24d from the frame 27. It is possible to reduce the light leaking to the light emitting surface 24b side through the gap 33 between the two.
- the light reflecting portion 34 is a metal thin film excellent in light reflectivity, and is made of aluminum, silver, titanium oxide, or the like, and is directly formed on the opposite end face 24d, end face 24e, and end face 24f.
- the light reflecting portion 34 is configured to diffuse and reflect light from the inside of the light guide plate 24 toward the end surfaces 24 d, 24 e, and 24 f toward the inside of the light guide plate 24.
- the light reflecting portion 34 is set to a thickness of 1 ⁇ m or less according to the light reflectance of the thin film.
- the light reflecting portion 34 is set to have a light reflectance equal to or higher than that of the other plate surface side light reflecting portion 34 formed on the plate surface 24 c on the back side of the light guide plate 24.
- the light reflectance of the light reflecting portion 34 is preferably set to be equal to or higher than the light reflectance of the frame 27.
- an aluminum thin film, a silver thin film, a titanium oxide film, or the like is formed on the opposite end surfaces 24d of the plurality of light guide plates 24 arranged in parallel by a method such as vapor deposition or sputtering.
- a method such as vapor deposition or sputtering.
- an aluminum thin film, a silver thin film, a titanium oxide film, or the like is formed by a method such as vapor deposition or sputtering.
- the plurality of light guide plates 24 are separated from each other to divide the metal thin film 46 formed in a lump (see FIG. 8).
- the metal thin film 46 has a small thickness and is in close contact with the end faces 24d, 24e, and 24f of the light guide plate 24. Therefore, the metal thin film 46 is divided so as to follow each light guide plate 24. Is done. Then, the light reflecting portion 34 is formed for each of the light guide plates 24.
- the light reflecting portion 34 is made of a synthetic resin excellent in light reflectivity (for example, white) or a film on which a white surface or a mirror surface is formed, and is in close contact with the opposite end surface 24d, end surface 24e, and end surface 24f. Are stacked.
- the light reflecting portion 34 is configured to reflect light traveling from the inside of the light guide plate 24 toward the end surfaces 24 d, 24 e, 24 f toward the inside of the light guide plate 24.
- the light reflecting portion 34 is set to have a light reflectance equal to or higher than that of the other plate surface side light reflecting portion 34 formed on the plate surface 24 c on the back side of the light guide plate 24.
- the light reflectance of the light reflecting portion 34 is preferably set to be equal to or higher than the light reflectance of the frame 27.
- the light reflecting portion 34 is formed by insert molding or two-color molding in the light reflecting portion forming step. Specifically, the light reflecting plate 34 formed by injection molding is put in the mold again, and the light reflecting portion 34 is additionally formed in a form of being laminated on the opposite end surface 24d, end surface 24e, and end surface 24f. In addition, after forming the structure which concerns on the light reflection part 34 previously, you may additionally form the light-guide plate 24. FIG. When the light reflection part 34 consists of a film, it is also called film insert molding. According to these methods, the light reflecting portion 34 can be suitably formed by devising a molding apparatus and a mold for molding the light guide plate 34, and compared with the first embodiment and the first modification of the first embodiment. The cost required for the light reflecting portion forming process can be reduced.
- Embodiment 2 of the present invention will be described with reference to FIG.
- the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed descriptions (configuration, effects, etc.) are omitted.
- the liquid crystal display device 110 including the backlight device 113 is illustrated.
- the configurations of the light reflecting portion 134 and the light shielding layer 132 are different from the configurations of the light reflecting portion 34 and the light shielding layer 32 of the first embodiment.
- the light reflecting portion 134 is made of a coating film in which the surfaces on the side of the end surfaces 24d, 24e, and 24f are mirror-like by directly applying the mirror ink to the opposite end surface 24d, the end surface 24e, and the end surface 24f.
- the light reflecting portion 34 is configured to mirror-reflect light directed from the inside of the light guide plate 24 toward the end surfaces 24 d, 24 e, and 24 f toward the inside of the light guide plate 24.
- the light shielding layer 132 is configured to cover the sealing material 11k from the front side, but does not shield the light reflected by the light reflecting portion 34 toward the display surface. Specifically, the light shielding layer 132 is formed so that the inner end 132a thereof overlaps with the opposite end surface 24d, the end surface 24e, and the end surface 24f. Further, the light shielding layer 32 is formed such that the outer end 32 b thereof is positioned so as to overlap the frame 27. That is, the light shielding layer 132 covers the gap 33 formed between the frame 27 and the opposite end surface 24d (light reflecting portion 34), thereby shielding the light traveling from the gap 33 toward the front surface side. It is set as the structure which does not cover the edge part on the opposite end surface 24d side.
- the light reflecting portion 34 has a mirror shape, and the light from the inside of the light guide plate 24 is specularly reflected. Therefore, compared to the configuration according to the first embodiment, the light reflected by the light reflecting portion 34 is The amount of light emitted from the end portion on the opposite end face 24d side of the light emitting surface 24b can be reduced, and even in a state where the outer peripheral end portion of the backlight device 13 is not covered by the light shielding layer 132, The outer peripheral edge is bright and shiny and difficult to see. For this reason, by reducing the width
- variety of the light shielding layer 132 (D1 0 mm), it can contribute to the frame narrowing further.
- the light reflecting portion 134 is a metal thin film having excellent light reflectivity, and is made of aluminum, silver, or the like, and is formed directly on the opposite end face 24d, end face 24e, and end face 24f.
- the light reflecting portion 134 is configured to mirror-reflect light directed from the inside of the light guide plate 24 toward the end surfaces 24 d, 24 e, and 24 f toward the inside of the light guide plate 24.
- Embodiment 3 of the present invention will be described with reference to FIG.
- the backlight device 213 is illustrated.
- the configurations of the light guide plate 224 and the frame 227 are different from the configurations of the light guide plate 24 and the frame 27 of the first embodiment.
- the light guide plate 224 has a rectangular shape as a whole in plan view, and has four corners rounded in a curved shape.
- the end surfaces 24e and 24d, and the connection portions of the end surfaces 24d and 24f are curved end surfaces 24d1 and 24d2, respectively, whose planar shapes are curved.
- the light reflecting portion 34 is formed on the opposite end surface 24d including the curved end surfaces 24d1 and 24d2 and the end surfaces 24e and 24f.
- the frame 227 has a frame shape extending along the end surfaces 24a, 24e, 24d, and 24f of the light guide plate 224.
- the inner peripheral surface 227a of the frame 227 is configured to face the end surfaces 24e, 24d, and 24f of the light guide plate 224 with a predetermined gap.
- the liquid crystal panel 11 and the cover panel 12 have the same shape as the outer shape of the frame 227 in plan view.
- the amount of light leaking from the opposite end surface 24d having the curved end surfaces 24d1 and 24d2 can be reduced, so that it is possible to favorably contribute to narrowing the frame of the backlight device 213.
- a gap is set between the light guide plate 224 and the frame 227 assembled to the light guide plate 224 in consideration of dimensional errors, assembly tolerances, and the like.
- the gap set for the curved end faces 24d1 and 24d2 is generally considered in consideration of the distortion of the molded product in comparison with the gap set for the other end faces whose plane shape is linear. It must be large.
- the amount of light that leaks from the curved end faces 24d1 and 24d2 and travels toward the light exit surface side through the gap is curved. This can be reduced by forming the light reflecting portion 34 on the end faces 24d1, 24d2.
- Embodiment 4 of the present invention will be described with reference to FIG.
- the backlight device 313 is illustrated.
- the configurations of the light guide plate 324 and the frame 327 are different from the configurations of the light guide plate 24 and the frame 27 of the first embodiment.
- the light guide plate 324 has a semi-oval shape in which an ellipse is halved along its minor axis in plan view.
- the light guide plate 324 has end faces 24a, 24e, and 24f that are linear end faces that are linear in plan view, while the opposite end face 324d is a curved end face that is curved (semicircular) in plan view.
- the light reflection part 34 is formed in the opposite end surface 324d and end surface 24e, 24f.
- the frame 327 has a frame shape extending along the end surfaces 24a, 24e, 24d, and 24f of the light guide plate 324.
- the inner peripheral surface 327a of the frame 327 is configured to face the end surfaces 24e, 24d, and 24f of the light guide plate 324 with a predetermined gap.
- the liquid crystal panel 11 and the cover panel 12 have the same shape as the outer shape of the frame 327 in plan view.
- the amount of light leaking from the opposite end surface 324d which is a curved end surface, can be reduced, so that it is possible to favorably contribute to narrowing the frame of the backlight device 313.
- Embodiment 5 of the present invention will be described with reference to FIG.
- the backlight device 413 is illustrated.
- the configurations of the light guide plate 424 and the frame 427 are different from the configurations of the light guide plate 24 and the frame 27 of the first embodiment.
- the light guide plate 424 has a circular shape as a whole in a plan view, and has a shape in which a part of the outer peripheral end is notched linearly.
- the end surface 24a is a linear end surface that is linear (string shape) in a plan view, while the opposite end surface 424d and the end surfaces 424e and 424f are curved in a plan view (arc shape). It is the end face.
- the light reflection part 34 is formed in the opposite end surface 424d and end surface 424e, 424f.
- the frame 427 has a frame shape extending along the end surfaces 24a, 424e, 424d, and 424f of the light guide plate 424.
- the inner peripheral surface 427a of the frame 427 is configured to face the end surfaces 24e, 424d, and 24f of the light guide plate 424 with a predetermined gap.
- the liquid crystal panel 11 and the cover panel 12 have the same shape as the outer shape of the frame 427 in plan view.
- the amount of light leaking from the opposite end surface 424d which is a curved end surface, can be reduced, so that the backlight device 413 can be advantageously contributed to a narrow frame.
- Embodiment 6 of the present invention will be described with reference to FIGS.
- a liquid crystal display device 510 including a backlight device 513 is illustrated.
- the configuration in which the through holes 11H and the through holes 513H are formed in the liquid crystal panel 11 and the backlight device 513, respectively, is different from the configurations of the liquid crystal panel 11 and the backlight device 13 in the first embodiment.
- the liquid crystal panel 11 has a donut shape in a plan view, and a through hole 11 ⁇ / b> H that penetrates in the plate thickness direction is formed.
- the light shielding layer 532 is formed along the outer peripheral end and the inner peripheral end of the liquid crystal panel 11.
- the light guide plate 524 has a donut shape as a whole in a plan view, and has a shape in which the outer peripheral end is partially cut out in a straight line shape.
- the end surface 24a is a linear end surface that is linear (string) in plan view, while the opposite end surface 524d and the end surfaces 524e and 524f are curved in a plan view (arc shape). It is the end face.
- the light guide plate 524 is formed with a through hole 524H penetrating in the thickness direction.
- the light guide plate 524 is in close contact with the inner peripheral end surface 524g of the through hole 524H, and reflects the light directed from the inside of the light guide plate 524 toward the through hole 524H.
- 535 is formed.
- the light reflection part 534 is formed in the opposite end surface 524d and end surface 524e, 524f.
- the description is abbreviate
- the frame 527 extends along the end surfaces 24a, 524e, 524d, and 524f of the light guide plate 524, and has a frame shape that extends along the inner peripheral surface 524g of the through hole 524H of the light guide plate 524.
- the frame 527 has a predetermined gap, the opposite end surface 524d of the light guide plate 524 and the outer inner peripheral surface 527a facing the end surfaces 524e and 524f, and the inner periphery of the light guide plate 524 with a predetermined gap.
- the inner surface 527b is opposed to the end surface 524g.
- the light guide plate 524 in which the through hole 534H is formed a portion located on the opposite side of the light incident surface 524a with respect to the through hole 524H is due to the through hole 524H being interposed between the light incident surface 524a.
- the light reflected by the light reflecting portion 534 and the inner peripheral end face side light reflecting portion 535 can be emitted from the portion, and the portion can be emitted. It is possible to suppress the occurrence of a situation in which the brightness of the camera decreases.
- Embodiment 7 of the present invention will be described with reference to FIGS. 15 to 18.
- a liquid crystal display device 610 provided with a backlight device 613 is illustrated.
- the shape of the opposite end surface 624d of the light guide plate 624 is different from the shape of the opposite end surface 24d of the light guide plate 34 of the first embodiment.
- the light reflecting portion forming step is different from that in the first embodiment.
- the light guide plate 624 is a vertically long plate-like member having a rectangular shape in plan view and having a plate surface arranged in parallel to the plate surface of the liquid crystal panel 11.
- the light guide plate 624 is made of a thin plate-like member having a thickness dimension of, for example, 6 mm or less, and each of the end surfaces 624d, 24e, and 24f has a rectangular shape, and the plate surface 24c on the back side.
- the inclined surface is inclined to form an obtuse angle.
- the light incident surface 24a extends in a form having an angle of approximately 90 ° with respect to the back plate surface 24c, as in the first embodiment.
- the angle ⁇ 1 between the end faces 624d, 24e, 24f and the back plate surface 24c is preferably in the range of 110 ° to 150 ° (110 ° ⁇ 1 ⁇ 150 °).
- the light guide plate 624 has a front plate surface 24b and a back plate surface 24c that are parallel to each other. If the angle between the opposite end surface 624d and the front plate surface 24b is ⁇ 2, ⁇ 2 Is preferably 30 ° to 70 ° (30 ° ⁇ 2 ⁇ 70 °).
- ⁇ 1 is larger than 110 °, as will be described later, it is possible to preferably print a paint for forming the light reflecting portion 34.
- ⁇ 2 is larger than 30 °, the formability of the corner portion related to ⁇ 1 is difficult to be lost when the light guide plate 624 is formed, and the tip is not easily chipped.
- the manufacturing method of the backlight device 613 according to the present embodiment includes a light reflecting portion forming step for forming the light reflecting portion 634.
- the light reflecting portion forming step the light reflecting portion 634 and the other plate side light reflecting portion 36 are collectively formed by screen printing using a flexible screen.
- the light guide plate 624 is disposed with the back surface 24c facing upward, and a screen 52 with a predetermined pattern is disposed above (see FIG. 16). Then, the paint 54 having light-reflective particles is placed on the screen 52, and the squeegee 56 is moved from the upper surface of the screen 52 toward the opposite end surface 624d toward the plate surface 24c on the back side (see FIG. 17). Continuously, the squeegee 56 is moved toward the light exit surface 24a while being pressed against the plate surface 24c on the back side. Then, the paint 54 passes through the eyes of the screen 52 and is applied to the opposite end surface 624d and the back plate surface 24c (see FIG. 18).
- the coating material 54 dries, it will be in the state by which the coating film was collectively formed with respect to the opposite end surface 624d and the board surface 24c of the back side. Thus, the light reflecting portion forming process is completed. At this time, the paint 54 may be applied to the end faces 24e and 24f at the same time.
- the other plate surface side light reflecting portion 34 and the light reflecting portion 634 in a lump, and in that case, the number of manufacturing steps can be reduced, which is preferable.
- the area of the opposite end surface 624d can be increased compared to the configuration of the opposite end surface 24d of the first embodiment, which is opposite to the light reflecting portion 624. By increasing the contact area with the end surface 624d, the light reflecting portion 624 can be made difficult to peel off.
- the light reflecting portion 634 and the other plate surface side light reflecting portion 36 are pressed by pressing the flexible pad portion 62 against the opposite end surface 624d and the back plate surface 24c. It forms in a lump by pad printing.
- the paint 64 having a predetermined pattern is transferred to the pad portion 62, and the pad portion 62 is moved in the direction approaching the light guide plate 24 (the direction of the arrow shown in FIG. 19) (see FIG. 19). . Then, the pad portion 62 is pressed against the opposite end surface 624d and the back plate surface 24c, and the paint 64 is transferred to the light guide plate 24 (see FIG. 20). At this time, since the pad portion 62 is elastically deformed along the opposite end surface 624d and the back plate surface 24c, the coating material 64 can be applied to the opposite end surface 624d and the back plate surface 24c all together. When the paint 64 is dried, the coating film is formed in a lump on the opposite end surface 624d and the back plate surface 24c. Thus, the light reflecting portion forming process is completed. At this time, the paint 64 may be simultaneously applied to the end faces 24e and 24f.
- the light guide plate 824 is a vertically long plate-like member having a rectangular shape in plan view and having a plate surface arranged in parallel to the plate surface of the liquid crystal panel 11.
- the light guide plate 24 is made of a thin plate-like member having a thickness dimension of, for example, 6 mm or less, and each tangential direction T1 of the end surfaces 824d, 24e, and 24f is an obtuse angle with respect to the back plate surface 24c. It is a curved surface that curves in the form of The light incident surface 24a extends in a form having an angle of approximately 90 ° with respect to the back plate surface 24c, as in the first embodiment.
- ⁇ 3 is larger than 110 °, it is possible to preferably print a paint for forming the light reflecting portion 34.
- the end surfaces 824d, 24e, 24f and the back plate surface 24c are connected in a curved shape, which is particularly preferable when printing both surfaces at once.
- ⁇ 4 is larger than 30 °, when the light guide plate 824 is formed, the formability of the corners related to ⁇ 4 is hardly impaired, and the tip is not easily chipped.
- the other plate surface side light reflecting portion 36 and the light reflecting portion 834 in a lump, and in that case, the number of manufacturing steps can be reduced, which is preferable.
- the area of the opposite end surface 624d can be increased compared to the configuration of the opposite end surface 24d of the first embodiment, which is opposite to the light reflecting portion 824. By increasing the contact area with the end surface 824d, the light reflecting portion 824 can be hardly peeled off.
- the light reflection portion 934 of the present embodiment is different from the light reflection portion 34 of the first embodiment and the first modification of the first embodiment in the range in which it is formed.
- the light reflecting portion 934 is formed, light is emitted from the light emitting surface 24b. This is a region that does not emit light, which may be a factor that hinders the narrowing of the frame of the backlight device 13. Considering these circumstances, the above-described extended dimensions are preferable. Further, the light reflecting portions 934 are also formed on the end surfaces 24e and 24f in the same manner as the opposite end surface 24d.
- the portion of the light reflecting portion 934 formed at the end 24b1 of the light emitting portion 24b has a function as a light shielding layer that blocks the light reflected by the light reflecting portion 934 toward the light emitting surface 24b.
- the portion of the light reflecting portion 934 has a function of complementing the light shielding layer 32 exemplified in Embodiment 1, or a function of shielding light in place of the light shielding layer 32.
- This portion of the light reflecting portion 934 can block light reflected by the opposite end surface 24d at a position closer to the opposite end surface 24d than the light shielding layer 32, and therefore, the width thereof is easy to be smaller than the light shielding layer 32, which is preferable. .
- the plurality of light guide plates 24 and the plurality of protective plate-like members 944 that protect the plate surfaces 24b and 24c of the light guide plate 24 are arranged without gaps in the plate thickness direction.
- the protective plate-like members 944 are alternately arranged in parallel, and the end surfaces 944 a of the protective plate-like members 944 are arranged so as to recede inward from the opposite end surface 24 d of the light guide plate 24.
- the protective plate member 944 has a plate surface that is slightly smaller than the light guide plate 24. About another aspect, it is the same as that of the modification 1 of Embodiment 1 or Embodiment 1, and abbreviate
- the light guide plate 24 is formed by injection molding of a transparent resin, there may occur sink marks at the time of molding, chipping or scratches that occur later. Such defects often occur particularly in the vicinity of the end faces 24a, 24d, 24e, and 24f, and light leaks from there, so that they are sometimes recognized as bright spots. According to the present embodiment, by providing the light reflecting portion 934 so as to cover those defects at least in the vicinity of the end faces 24d, 24e, and 24f, the occurrence of bright spot defects can be suppressed. Further, in the present embodiment, it is possible to make it difficult for the light reflecting portion 934 to peel off by increasing the contact area between the light reflecting portion 934 and the light guide plate 24 as compared with the configuration of the first embodiment.
- the light guide plate 1024 and the light reflecting portion 1034 of the present embodiment are different in shape from the light guide plate 24 and the light reflecting portion 934 of the tenth embodiment.
- the liquid crystal display device 1110 of this embodiment is different from the first embodiment in that the backlight device 1113 does not include the frame 27 but includes the metal frame 72.
- the metal frame 72 is made of metal having a light reflectance lower than that of the light reflecting portion 34 such as stainless steel.
- the metal frame 72 has a substantially box shape, rises from the bottom surface portion 72a, the outer peripheral end of the bottom surface portion 72a, and faces the end surfaces 24a, 24d, 24c, and 24f of the light guide plate 24, and rises of the side wall portion 72b.
- An extending portion 72c that extends inward from the end and on which the liquid crystal panel 11 is placed.
- the metal frame 72 is configured to accommodate at least the LEDs 22 and the light guide plate 24.
- the backlight frame 1113 includes the end face of the light guide plate 24 to the outer peripheral edge of the backlight apparatus 1113 as the backlight frame
- the backlight from the opposite end face 24d and the end faces 24e and 24f to the outer peripheral end of the metal frame 72 is used.
- the size of the light picture frame can be about 0.6 mm.
- the metal frame 72 is easier to reduce the thickness than the frame 27 and can be said to be an advantageous configuration for narrowing the frame of the backlight device.
- the thickness dimension of the side wall portion of the casing 14 is about 1.5 mm.
- the liquid crystal display The frame width of the device 1110 can be about 2.2 mm.
- the screen brightness of the backlight device 1113 is about 540 cd / m 2, and the effect of improving the screen brightness is seen as compared with the backlight device that does not include the light reflecting portion 34.
- the packaging member 82 has, for example, a film shape, a sheet shape, or a bag shape with a thickness of about 5 to 5000 ⁇ m, and wraps at least the LED 22 and the light guide plate 24 together so as to cover the light emitting surface 24b and the opposite end surface 24d.
- the packaging member 82 has a flexible strip shape, and the upper surface of the optical sheet 25, the opposite end surface 24 d of the light guide plate 24, and the light reflection in a posture in which the longitudinal direction thereof is along the longitudinal direction of the light guide plate 24. It extends along the lower surface of the sheet 26.
- illustration is abbreviate
- the backlight frame from the end surface of the light guide plate 24 to the outer peripheral edge of the backlight device 1213 is a backlight frame
- the backlight from the opposite end surface 24d and the end surfaces 24e, 24f to the outer peripheral end of the packaging member 82 is used.
- the size of the light picture frame can be about 0.2 mm.
- the packaging member 82 has an extremely thin thickness compared to the frame 27, and can be said to be an advantageous configuration for narrowing the frame of the backlight device.
- the thickness dimension of the side wall portion of the casing 14 is about 1.5 mm.
- the frame width of the device 1210 can be about 2.2 mm.
- the screen brightness of the backlight device 1213 was about 530 cd / m 2, and the effect of improving the screen brightness was seen compared to the backlight device that does not include the light reflecting portion 34.
- the configuration including the packaging member 82 it is necessary to use a member having excellent translucency in order to cover the light emitting surface 24 b of the light guide plate 24. If the configuration does not include the light reflecting portion 34, most of the light leaking from the opposite end surface 24d of the light guide plate 24 passes through the packaging member 82 and leaks outward, and is reflected inside the light guide plate 24 to emit light. The light cannot be emitted from the portion 24b.
- the light reflecting portion 34 by providing the light reflecting portion 34, the light as described above can be reflected by the light reflecting portion 34 and emitted from the light emitting surface 24b, and the luminance of the backlight device 1213 can be suitably increased. Can be improved.
- the housing 1314 is arranged on the front side housing (housing member) 1314a that houses the liquid crystal panel 11, the backlight device 1313, and the like, and the back side of the front side housing 1314a, and controls the driving of the liquid crystal panel 11.
- the control board and the LED drive board for supplying drive power to the LEDs 22 and other substrates (not shown), and a back-side casing 1314b for housing the battery 19 and the like are divided.
- casing part 1314b is being fixed with the front side housing
- the front side housing (housing member) 1314a is made of, for example, a metal having light reflectivity.
- casing part 1314a is not limited to this, For example, the synthetic resin which has light reflectivity may be used.
- the front-side casing 1314a has a substantially box shape, and includes a bottom surface portion 72a and a side wall portion 72b that rises from the outer peripheral end of the bottom surface portion 72a and faces the end surfaces 24a, 24d, 24c, and 24f of the light guide plate 24. ing.
- a cover panel mounting surface 14a is formed in the front side casing 1314a so as to cut out the inner peripheral surface of the opening, and the cover panel 12 is mounted so that the opening of the front side casing 1314a is closed. It fixes with respect to the mounting surface 14a through the adhesive layer which is not shown in figure.
- the liquid crystal panel 11 is affixed to the cover panel 12 with a transparent adhesive layer called OCA (Optically-Clear-Adhesive), and is fixed to the front-side casing 1314a via the cover panel 12.
- OCA Optically-Clear-Adhesive
- FIG. 27 the configuration relating to the touch panel is omitted, but if necessary, the touch panel may be adhered between the cover panel 12 and the liquid crystal panel 11 or attached to the cover panel 12. What added the function which concerns on a touch panel, and what added the function which concerns on the touch panel to the liquid crystal panel 11 may be used.
- the backlight frame is a backlight frame from the end surface of the light guide plate 24 to the outer peripheral end of the backlight device 1313 in the backlight device 1313
- the opposite end surface 24d and the end surfaces 24e, 24f of the light guide plate 24 are the backlight device 1313.
- the size of the backlight frame can be substantially 0 mm.
- the thickness dimension of the side wall portion of the casing 14 is about 1.5 mm.
- a liquid crystal display The frame width of the device 1310 can be about 2.2 mm.
- the screen brightness of the backlight device 13 is about 530 cd / m 2, and an effect of improving the screen brightness is seen as compared with the backlight device that does not include the light reflecting portion 34.
- the cover panel (housing member) 1412 is made of, for example, tempered glass having high transparency.
- the material of the cover panel 1412 is not limited to this, For example, you may be made from the synthetic resin which has a light transmittance.
- the cover panel 1412 has a substantially box shape, a cover portion 1412a that covers the display surface 11D of the liquid crystal panel 11, and a side wall that rises from the outer peripheral end of the cover portion 1412a and faces the end surfaces 24a, 24d, 24c, and 24f of the light guide plate 24. Part 1412b.
- the cover panel 1412 is configured to sequentially house the liquid crystal panel 11 and the backlight device 13 in this order. Note that the method of fixing the liquid crystal panel 11 to the cover portion 1412a is the same as that in the fourteenth embodiment, and a description thereof will be omitted.
- the casing 1414 is arranged on the back side of the front side casing 1414a and the front side casing 1414a arranged on the back side of the cover panel 1412 so as to close the opening, and controls the driving of the liquid crystal panel 11.
- the circuit board is divided into a board (not shown) such as an LED drive board that supplies drive power to the control board and the LED 22, and a back casing 1414 b that houses the battery 19 and the like.
- casing part 1414b is being fixed to the front side housing
- casing part 1414a is being fixed with respect to the cover panel 1412 via the contact bonding layer which is not shown in figure.
- the cover panel 1412 In the configuration in which the cover panel 1412 is opposed to the end surface of the light guide plate 24, in the configuration in which the light reflecting portion 34 is not provided, most of the light leaking from the opposite end surface 24d of the light guide plate 24 is transmitted through the cover panel 1412 to the outside. And cannot be reflected from the light guide plate 24 and emitted from the light emitting portion 24b.
- the light reflecting portion 34 by providing the light reflecting portion 34, the light as described above can be reflected by the light reflecting portion 34 and emitted from the light emitting surface 24b, and the luminance of the backlight device 1413 can be suitably increased. Can be improved.
- the light guide plate 24 is exemplified by the configuration in which the light reflecting portions 34 are formed on the end surfaces 24e and 24f, but the present invention is not limited thereto. In another embodiment, the light reflecting portion 34 may not be formed on the end surfaces 24e and 24f.
- the configuration in which the light shielding layers 32 and 132 are formed on the liquid crystal panel is exemplified, but the present invention is not limited thereto.
- the light shielding layer formed separately may be arranged between each component of the liquid crystal panel and the backlight device, or the light shielding layer is formed on the cover panel. It may be configured.
- a touch panel (position information detection panel) can be added between the cover panel and the liquid crystal panel.
- an adhesive is provided between the cover panel and the touch panel. It is preferable that the touch panel and the liquid crystal panel are fixed with an adhesive.
- the touch panel pattern of the touch panel it is possible to adopt a projection capacitive method, a surface capacitive method, a resistive film method, an electromagnetic induction method, or the like.
- a parallax barrier panel can be added between the cover panel and the liquid crystal panel.
- the cover panel and the parallax barrier panel are fixed with an adhesive. It is preferable to fix the parallax barrier panel and the liquid crystal panel with an adhesive.
- the parallax barrier panel has a parallax barrier pattern for allowing an observer to observe a stereoscopic image (3D image, three-dimensional image) by separating an image displayed on the display surface of the liquid crystal panel by parallax. If a liquid crystal panel is used as the parallax barrier panel, it is possible to switch between a planar image (2D image, two-dimensional image) and a stereoscopic image. It is also possible to form a parallax barrier pattern on the cover panel and to have a parallax barrier function.
- the frame has a rectangular cross-sectional shape, but is not limited thereto.
- the cross-sectional shape of the frame may be a stepped shape having a surface on which each component member is placed.
- the backlight device and the liquid crystal panel are attached by the panel adhesive tape is shown.
- the backlight is obtained by a method other than the adhesive tape (for example, screwing or riveting). You may make it fix an apparatus and a liquid crystal panel to an attachment state.
- the present invention can be appropriately applied to backlight devices and liquid crystal display devices having various shapes.
- a TFT is used as a switching element of a liquid crystal display device.
- the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)).
- a switching element other than TFT for example, a thin film diode (TFD)
- the present invention can also be applied to a liquid crystal display device for monochrome display.
- protective plate member 52 ... screen, 72 ... metal frame, 82 ... packaging member, 524g ... Inner peripheral end face, 524H ... through hole, 535 ... inner peripheral end face side light reflecting portion, 314a ... front housing part (housing member), 1412 ... cover panel (housing member)
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Abstract
Description
しかしながら、特許文献1に示されるようなエッジライト方式の構成では、導光板内に入射された光が、光入射面の反対側に位置する導光板の端面(以下、反対端面)から漏れ出し易く、当該光漏れに起因して照明装置の輝度が低下する虞がある。また、特許文献1に示されるようなフレームを備える構成では、反対端面から漏れ出した光がフレームで反射して、導光板とフレームとの間の隙間を介して光出射面側に向かい、光出射面の反対端面側が明るく視認される虞がある。そのような事態の発生を抑制するための構成として、照明装置の光出射面側において反対端面から漏れる光を遮光する幅広な遮光層を設ける構成が考えられるが、遮光層の幅寸法によっては、照明装置若しくは当該照明装置を備える表示装置の狭額縁化を阻害する要因となり、問題がある。
本発明に係る照明装置は、光源と、板状部材にて構成される導光板であって、前記板状部材の端面からなり、前記光源と対向し、前記光源から発せられた光が入射される光入射面と、前記光入射面の反対側に位置する前記板状部材の端面からなる反対端面と、前記板状部材の一の板面からなり、前記光入射面から入射された光が出射される光出射面とを有する導光板と、少なくとも前記反対端面に密着する形で形成され、前記導光板の内部から前記反対端面に向かう光を反射する光反射部と、を備える。
本発明によれば、輝度の低下を抑制するとともに、狭額縁化に寄与することができる。
本発明の実施形態1を、図1から図8を参照しつつ説明する。本実施形態では、バックライト装置13と、このバックライト装置13を備える液晶表示装置10について例示する。なお、各図面には、X軸、Y軸及びZ軸が示されている。また、図3に示される上側を表側とし、同図下側を裏側として、バックライト装置13等を説明する。
光反射部34は、図5に示すように、少なくとも反対端面24dに密着する形で形成され、導光板24の内部から反対端面24dに向かう光を反射する構成とされている。光反射部34は、反対端面24dの全域に亘って、ベタ状に形成されている。本実施形態では、光反射部34は、図6に示すように、導光板24の反対端面24dのみならず、端面24e及び端面24fにも同様に形成される構成を例示する。すなわち、光反射部34は、光源対向端面である光入射面24aに形成されない一方、光源非対向端面である反対端面24d、端面24e、及び端面24fに形成されている。このような構成によれば、反対端面24dから漏れ出る光に加えて、端面24e及び端面24fから漏れ出る光の量を低減することにより、より一層、導光板24から漏れ出る光量を低減することができる。なお、図6においては、光学シート25を省略した形でバックライト装置13を示している。
本実施形態に係るバックライト装置13は、LED22と、板状部材にて構成される導光板24であって、板状部材の端面24aからなり、LED22と対向し、LED22から発せられた光が入射される光入射面24aと、光入射面24aの反対側に位置する板状部材の端面24dからなる反対端面24dと、板状部材の一の板面24bからなり、光入射面24aから入射された光が出射される光出射面24bとを有する導光板24と、少なくとも反対端面24dに密着する形で形成され、導光板24の内部から反対端面24dに向かう光を反射する光反射部34と、を備える。
続いて実施形態1の変形例1について説明する。変形例1に係る液晶表示装置10では、光反射部34の構成及び光反射部34の成膜方法が実施形態1のものと相違する。その他の構成及び方法については実施形態1で説明したものと同様であるため、構造、作用、及び効果の説明は省略する。
続いて実施形態1の変形例2について説明する。変形例2に係る液晶表示装置10では、光反射部34の構成及び光反射部34の形成方法が実施形態1及び実施形態1の変形例1のものと相違する。その他の構成及び方法については実施形態1で説明したものと同様であるため、構造、作用、及び効果の説明は省略する。
次いで、本発明の実施形態2を、図9を参照しつつ説明する。なお、以降の実施形態では、実施形態1と同じ部分については、実施形態1と同じ符号を付して、その詳細な説明(構成、効果等)は省略する。本実施形態では、バックライト装置113を備えた液晶表示装置110を例示する。本実施形態のバックライト装置113は、光反射部134及び遮光層132の構成が実施形態1の光反射部34及び遮光層32の構成と相違する。
続いて実施形態2の変形例1について説明する。変形例1に係る液晶表示装置110では、光反射部134の構成及び光反射部134の成膜方法が実施形態2のものと相違する。その他の構成については実施形態2及び実施形態1の変形例1で説明したものと同様であるため、構造、作用、及び効果の説明は省略する。
次いで、本発明の実施形態3を、図10を参照しつつ説明する。本実施形態では、バックライト装置213を例示する。本実施形態のバックライト装置213は、導光板224及びフレーム227の構成が実施形態1の導光板24及びフレーム27の構成と相違する。
次いで、本発明の実施形態4を、図11を参照しつつ説明する。本実施形態では、バックライト装置313を例示する。本実施形態のバックライト装置313は、導光板324及びフレーム327の構成が実施形態1の導光板24及びフレーム27の構成と相違する。
次いで、本発明の実施形態5を、図12を参照しつつ説明する。本実施形態では、バックライト装置413を例示する。本実施形態のバックライト装置413は、導光板424及びフレーム427の構成が実施形態1の導光板24及びフレーム27の構成と相違する。
次いで、本発明の実施形態6を、図13及び図14を参照しつつ説明する。本実施形態では、バックライト装置513を備えた液晶表示装置510を例示する。本実施形態では、液晶パネル11及びバックライト装置513にそれぞれ貫通孔11H及び貫通孔513Hが形成された構成が実施形態1の液晶パネル11及びバックライト装置13の構成と相違する。
次いで、本発明の実施形態7を、図15から図18を参照しつつ説明する。本実施形態では、バックライト装置613を備えた液晶表示装置610を例示する。本実施形態では、導光板624の反対端面624dの形状が実施形態1の導光板34の反対端面24dの形状と相違する。また、本実施形態では、光反射部形成工程が実施形態1と相違する。
次いで、本発明の実施形態8を、図19及び図20を参照しつつ説明する。本実施形態では、実施形態7と光反射部形成工程が相違する。
次いで、本発明の実施形態9を、図21を参照しつつ説明する。本実施形態では、導光板824の反対端面824dの形状が実施形態7の導光板634の反対端面624dの形状と相違する。なお、光反射部834の形成する光反射部形成工程については、実施形態7又は実施形態8と同様に行うことができる。
次いで、本発明の実施形態10を、図22及び図23を参照しつつ説明する。本実施形態の光反射部934は、実施形態1及び実施形態1の変形例1の光反射部34と、その形成される範囲が相違する。
次いで、本発明の実施形態11を、図24を参照しつつ説明する。本実施形態の導光板1024及び光反射部1034は、実施形態10の導光板24と光反射部934と、その形状が相違する。
次いで、本発明の実施形態12を、図25を参照しつつ説明する。本実施形態の液晶表示装置1110では、バックライト装置1113がフレーム27を備えず、金属フレーム72を備える点が実施形態1と相違する。
次いで、本発明の実施形態13を、図26を参照しつつ説明する。本実施形態の液晶表示装置1210では、バックライト装置1213がフレーム27を備えず、光透過性を有する包装部材82を備える点が実施形態1と相違する。
次いで、本発明の実施形態14を、図27を参照しつつ説明する。本実施形態の液晶表示装置1310では、バックライト装置1313がフレーム27を備えず、反対端面24dが筐体1314の内面と対向する形で導光板24が筐体1314に収容される点が実施形態1と相違する。言い換えれば、筐体1314がフレーム27に係る構成を兼ねた構成とされている。
次いで、本発明の実施形態15を、図28を参照しつつ説明する。本実施形態では、カバーパネル(収容部材)1412及び筐体1414の構成が、実施形態14のカバーパネル12及び筐体1314の構成と相違する。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
Claims (15)
- 光源と、
板状部材にて構成される導光板であって、前記板状部材の端面からなり、前記光源と対向し、前記光源から発せられた光が入射される光入射面と、前記光入射面の反対側に位置する前記板状部材の端面からなる反対端面と、前記板状部材の一の板面からなり、前記光入射面から入射された光が出射される光出射面とを有する導光板と、
少なくとも前記反対端面に密着する形で形成され、前記導光板の内部から前記反対端面に向かう光を反射する光反射部と、を備える照明装置。 - 前記導光板は、平面形状が曲線状とされる曲線状端面を少なくとも有し、
前記光反射部は、前記曲線状端面に形成されている請求項1に記載の照明装置。 - 前記導光板には、その板厚方向に貫通する貫通孔が形成され、
前記貫通孔の内周端面に密着する形で、前記導光板の内部から前記貫通孔に向かう光を反射する内周端面側光反射部が形成されている請求項1又は請求項2に記載の照明装置。 - 前記導光板には、前記板状部材の他の板面に密着する形で、前記導光板の内部から前記他の板面に向かう光を前記光出射面側に向けて反射する他板面側光反射部が形成され、
前記反対端面は、前記他の板面に対して鈍角をなす形で傾斜する傾斜面とされている請求項1から請求項3の何れか一項に記載の照明装置。 - 前記導光板には、前記板状部材の他の板面に密着する形で、前記導光板の内部から前記他の板面に向かう光を前記光出射面側に向けて反射する他板面側光反射部が形成され、
前記反対端面は、その接線方向が前記他の板面に対して鈍角をなす形で湾曲する曲面とされている請求項1から請求項3の何れか一項に記載の照明装置。 - 前記光反射部は、前記光出射面のうち前記反対端面側の端部と、前記反対端面と、前記他の板面のうち前記反対端面側の端部と、に跨る領域に、断面視Uの字に形成されている請求項1から請求項5の何れか一項に記載の照明装置。
- 光反射性を有する合成樹脂製とされ、前記導光板の前記端面に対向するようにして、少なくとも前記光源と前記導光板を取り囲む形で延設される樹脂フレームを更に備える請求項1から請求項6の何れか一項に記載の照明装置。
- 前記光反射部より光反射率が低い金属製とされ、前記導光板の前記端面に対向するようにして、少なくとも前記光源と前記導光板を収容する形で設けられる金属フレームを更に備える請求項1から請求項6の何れか一項に記載の照明装置。
- 少なくとも前記光源と、前記導光板とを、前記光出射面及び前記反対端面を覆う態様で一括して包むことで、これらの部材を組み付ける光透過性を有する包装部材を更に備える請求項1から請求項6の何れか一項に記載の照明装置。
- 請求項1から請求項9の何れか一項に記載の照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える表示装置。
- 前記照明装置と、前記表示パネルとを収容する収容部材であって、略箱形をなし、その側壁部が前記導光板の前記端面に対向する姿勢で配される収容部材を更に備える請求項10に記載の表示装置。
- 請求項1から請求項9の何れか一項に記載の照明装置を製造する照明装置の製造方法であって、
前記光反射部を形成する光反射部形成工程を含み、
前記光反射部形成工程では、複数の前記導光板をその板厚方向に隙間なく並列するとともに前記反対端面が互いに面一状に連なる態様で配して、複数の前記導光板の前記反対端面に対して光反射性を有する粒子を含む塗膜、又は光反射性を有する金属薄膜を形成することで、前記光反射部を複数の前記導光板に対して一括して形成する照明装置の製造方法。 - 請求項4又は請求項5に記載の照明装置を製造する照明装置の製造方法であって、
前記光反射部を形成する光反射部形成工程を含み、
前記光反射部形成工程では、前記光反射部及び前記他板面側光反射部を可撓性を有するスクリーンを用いたスクリーン印刷によって一括して形成する照明装置の製造方法。 - 請求項4又は請求項5に記載の照明装置を製造する照明装置の製造方法であって、
前記光反射部を形成する光反射部形成工程を含み、
前記光反射部形成工程では、可撓性を有するパッド部を前記反対端面及び前記他の板面に押し当てることで、前記光反射部及び前記他板面側光反射部をパッド印刷によって一括して形成する照明装置の製造方法。 - 請求項6に記載の照明装置を製造する照明装置の製造方法であって、
前記光反射部を形成する光反射部形成工程を含み、
前記光反射部形成工程では、複数の前記導光板と、前記導光板の板面を保護する複数の保護用板状部材とを、その板厚方向に隙間なく交互に並列するとともに前記保護用板状部材の端面が前記導光板の前記反対端面より内側に後退した位置となる態様で配して、複数の前記導光板の前記光出射面のうち前記反対端面側の端部と、複数の前記導光板の前記反対端面と、複数の前記導光板の前記他の板面のうち前記反対端面側の端部とに対して光反射性を有する粒子を含む塗膜、又は光反射性を有する金属薄膜を形成することで、前記光反射部を複数の前記導光板に対して一括して形成する照明装置の製造方法。
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US10345504B2 (en) | 2019-07-09 |
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