WO2010052955A1 - 面光源装置および液晶表示装置 - Google Patents
面光源装置および液晶表示装置 Download PDFInfo
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- WO2010052955A1 WO2010052955A1 PCT/JP2009/062761 JP2009062761W WO2010052955A1 WO 2010052955 A1 WO2010052955 A1 WO 2010052955A1 JP 2009062761 W JP2009062761 W JP 2009062761W WO 2010052955 A1 WO2010052955 A1 WO 2010052955A1
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- light
- light source
- light guide
- source device
- guides
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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
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
- G02B6/008—Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
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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
- G02B6/005—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
- G02B6/0051—Diffusing sheet or layer
Definitions
- the present invention relates to a surface light source device used as a backlight of a liquid crystal display device and a liquid crystal display device including the surface light source device.
- liquid crystal display devices which are rapidly spreading in place of cathode ray tubes (CRT), are widely used in liquid crystal televisions, monitors, mobile phones and the like, taking advantage of their energy-saving, thin, and lightweight features.
- improvement of an illuminating device (so-called backlight) disposed behind the liquid crystal display device can be mentioned.
- Lighting devices are mainly classified into side light type (also called edge light type) and direct type.
- the side light type has a configuration in which a light guide plate is provided behind the liquid crystal display panel, and a light source is provided at the lateral end of the light guide plate. Light emitted from the light source is reflected by the light guide plate and indirectly irradiates the liquid crystal display panel indirectly.
- sidelight type lighting devices are mainly used in small and medium liquid crystal displays such as mobile phones and notebook computers.
- the direct type lighting device arranges a plurality of light sources behind the liquid crystal display panel and directly irradiates the liquid crystal display panel. Therefore, it is easy to obtain high brightness even on a large screen, and it is mainly used in large liquid crystal displays of 20 inches or more.
- the current direct type illumination device has a thickness of about 20 mm to 40 mm, which is an obstacle to further thinning the display.
- Aiming for further thinning with large liquid crystal displays can be solved by reducing the distance between the light source and the liquid crystal display panel, but in that case, if the number of light sources is not increased, the brightness uniformity of the lighting device can be obtained. Can not. On the other hand, increasing the number of light sources increases the cost. Therefore, it is desired to develop a lighting device that is thin and excellent in luminance uniformity without increasing the number of light sources.
- a convex portion 118p formed on the light exit surface 118a of the light guide plate 118 is parallel to the parallel groove 118f, and is formed on each of the light guide plates 118A, 118B, and 118C.
- the structure provided in the boundary portion is disclosed.
- the convex part 118p has a rounded shape, such as an ellipse cut in half, and is formed with a certain height and width in a direction parallel to the parallel groove 118f.
- the height of the convex portion 118p is not particularly limited, but may be a height that can sufficiently reduce the luminance unevenness on the light exit surface 118a of the light guide plate 118 by the film member disposed thereon.
- the shape and number of the portions 118p are not limited to the positions and numbers illustrated in FIG. 10A, and it is described that any number can be provided at any position.
- a plurality of lenticular lenses 134 are provided on the light exit surface 118a located above the parallel groove 118f in which the light source 112 is disposed, and the reflection sheet 122 is an inclined surface (lower surface in the drawing) of the light guide plate 118. It is formed so as to cover.
- the convex portion 118p formed on the light emitting surface 118a is used as a spacer for separating an optical member (such as a prism sheet or a diffusion sheet) from the flat portion of the light emitting surface 118a by a predetermined distance.
- an optical member such as a prism sheet or a diffusion sheet
- the light irradiated onto the optical member is made uniform, and a surface light source device having excellent luminance uniformity is obtained. It is described that it can be realized.
- the light guide plates 213a, 213b, and 213c for surface emitting light from the light sources 211a, 211b, and 211c are formed separately.
- the reflection sheets 214a, 214b, and 214c are formed so as to cover the inclined surfaces (lower surfaces in the drawing) of the respective light guide plates 213a, 213b, and 213c.
- a light shielding layer 241 is provided at a position where the thickness of the rear end of each light guide plate 213a, 213b is thinnest.
- a configuration is disclosed in which a transparent plate 278 is provided on the upper surface of the light guide plates 213a, 213b, and 213c via an adhesive layer 272a, and a diffusion plate 276 is provided thereon via an adhesive layer 272b. ing.
- the transparent plate 278 is thickly provided between the light guide plates 213a, 213b, and 213c and the diffusion plate 276, the diffusion plate 276 is sufficiently separated from the light guide plates 213a, 213b, and 213c. It is described that the light amount unevenness corresponding to the bright line or the dark portion can be averaged, and a surface light source device excellent in luminance uniformity can be realized.
- the convex portion 118p formed on the light exit surface 118a of the light guide plate 118 described in the above-mentioned Patent Document 1 allows an optical member (such as a prism sheet or a diffusion sheet) to be moved from the flat portion of the light exit surface 118a to a predetermined portion. It is intended only to be separated by a distance, and the position where the convex portion 118p is provided is not considered at all. For this reason, the light emitted from the light exit surface 118a of the light guide plate 118 is reflected by the convex portion 118p, thereby causing uneven brightness, resulting in a non-uniform light emission state. When such a surface light source device is used as a backlight, the display quality is degraded.
- an optical member such as a prism sheet or a diffusion sheet
- Patent Document 1 is a configuration in which a convex portion 118p is formed on the light exit surface 118a of the light guide plate 118.
- a fine shape such as a prism or a lens is processed on the surface of the light guide plate. With this fine shape, light is scattered and emitted from the light guide plate. Therefore, as described above, when the convex portion 118p is provided on the light emitting surface 118a of the light guide plate 118, light is scattered here as well.
- the convex part 118p is very large compared with fine shapes, such as a prism and a lens, the amount of scattered light is large and causes a bright spot.
- the space between the light guide plates 213a, 213b, and 213c and the diffusion plate 276 is sufficient.
- the transparent substrate 278 is thickly provided. Therefore, according to the above configuration, although the uniformity of the luminance can be ensured by the thick transparent substrate 278, there is a problem that the luminance is lowered.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a surface light source device that is thin and has improved luminance uniformity without causing a decrease in luminance.
- the surface light source device of the present invention includes a plurality of combinations of a light source and a light guide that diffuses light from the light source to cause surface emission, and further mounts the light source.
- the surface light source device provided with the optical sheet on the light emitting surface composed of the emission surface of each light guide body, the light emitting surface and the optical sheet are fixed on the substrate.
- the distance holding portion for holding the distance is provided so as to protrude from a gap formed in a continuous portion so that the two adjacent light guides do not overlap.
- the distance holding unit is provided in a low luminance area on the light emitting surface composed of the emission surface of each light guide. This is because the ratio of the light reflected from the distance holding unit out of the light emitted from the light emitting surface can be reduced, and the influence of the distance holding unit on the luminance distribution on the light emitting surface can be reduced. Because you can.
- light guides are manufactured with negative tolerances in consideration of damage between light guides, thinning of lighting devices, manufacturing errors, and the like.
- Such a gap is a non-light-emitting region on the light-emitting surface formed by connecting the light-emitting surfaces of the light guides, and thus has a low luminance.
- the gap that can be formed in a continuous portion so that the light guides having the above configuration do not overlap each other refers to a gap that is generated when the light guides are connected on the same plane.
- the gap generated between the light guides is the entire circumference of one light guide (for example, a plane).
- the gaps that can be formed in continuous portions so that the light guides do not overlap each other on the four sides of the rectangle are the gaps that can be formed in continuous portions so that the light guides do not overlap each other on the four sides of the rectangle).
- the light guide In a lighting device (tandem lighting device) in which a light emitting portion of the other light guide adjacent to the one light guide rides on the light guide portion of one light guide, the light guide There are a gap that can be formed in a continuous portion so that the bodies do not overlap and a gap that can be formed in a continuous portion so that the light guides overlap. Therefore, the above configuration does not focus on the gap that can be formed in the tandem illumination device so that the light guides overlap each other.
- a distance holding unit for holding the light emitting surface and the optical sheet at a certain distance on a substrate for mounting the light source so that the two light guides adjacent to each other do not overlap.
- it is not necessary to use a thick transparent substrate. It will not lead to a decline.
- the distance holding unit is provided in a gap formed on the light emitting surface so that the two adjacent light guides that are adjacent to each other in a dark place do not overlap with each other. Luminance unevenness caused by reflection of light emitted from the light exit surface of the light guide at the distance holding unit can be suppressed.
- the distance holding unit can provide a certain space between the light emitting surface and the optical sheet, the light in the space between the light emitting surface and the optical sheet. Since the light emitted from the emission surface overlaps and is made uniform in multiple directions, the luminance uniformity can be improved.
- the surface of the light guide is subjected to fine processing such as prisms and lenses, and the light propagating inside the light guide is scattered in the fine shape obtained by the micro processing and is exposed to the outside. It comes to be taken out.
- the distance holding unit is provided on the substrate for mounting the light source, which is a separate body from the light guide, the distance holding unit propagates through the inside of the light guide. Since the light to be received hardly receives the scattering action, unevenness in luminance can be suppressed.
- the optical sheet in addition to the effect of improving luminance unevenness, can be provided at a certain distance from the light guide compared to the configuration in which the optical sheet is in close contact with the light guide.
- the structure is also suitable for protecting the surface of the optical sheet.
- the optical sheet includes an optical sheet that exerts some optical action on optical characteristics such as luminance, luminance distribution, polarization state, or color of light emitted from the light emitting surface.
- optical characteristics such as luminance, luminance distribution, polarization state, or color of light emitted from the light emitting surface.
- a specific example is a diffuser plate having a thickness of about 2 to 3 mm disposed at a location about several mm away from the light emitting surface.
- the thickness of the optical sheet and the distance from the light emitting surface are not limited to the above.
- a diffusion sheet of about several hundred ⁇ m, a prism sheet, a polarization reflection sheet, etc. Multiple function optical sheets may be laminated.
- each of the light guides includes a light emitting unit having an emission surface and a light guide unit that guides light from the light source to the light emitting unit, and guides one of the light guides.
- the light-emitting part of the other light guide adjacent to the one light guide is placed on the part, and the distance holding part can be a continuous part so that the two adjacent light guides do not overlap. It is preferable that a gap formed in a continuous portion so that the two adjacent light guides overlap with each other protrude from a substantially orthogonal portion.
- the distance holding unit is provided in a portion where the gaps are substantially orthogonal to each other, the position is symmetrical with respect to the light emitting units of the four adjacent light guides forming the gap. It is the structure provided in. Therefore, the optical influence which the said distance holding
- the lighting device tandem lighting device arranged so that the light emitting portion of the other light guide adjacent to the one light guide rides on the light guide portion of one light guide.
- one gap is formed in the light guide having a light-emitting part having an emission surface and a light-guide part that guides light from the light source to the light-emitting part.
- the light guide part of the other light guide member adjacent to the one light guide member is disposed on the light guide part of the light member, the emission surface of the one light guide member and the other light guide member are disposed. This is the gap created at the joint between the outgoing faces of the body.
- a gap that can be formed so that the two adjacent light guides do not overlap each other and a gap that can be formed so that the two adjacent light guides overlap each other are substantially orthogonal to each other. It is provided in a symmetrical position with respect to the light emitting portions of the four adjacent light guides forming the gap so as to protrude from the portion. Because of such a configuration, the distance holding unit can equalize the optical influence on the emission surfaces of the four adjacent light emitting units, and the distance holding unit has a plurality of emission surfaces. Since the influence on the luminance distribution on the light emitting surface can be made uniform, the luminance uniformity of the light emitting surface can be improved.
- the light guides are arranged side by side on the same plane so as not to overlap each other, and the distance holding unit is continuous so that the two adjacent light guides do not overlap. It is preferable that the gaps formed in the portions are provided so as to protrude from the substantially orthogonal portions.
- the distance holding portion is configured to be provided at a symmetrical position with respect to the exit surfaces of the four adjacent light guides forming the gap because the gap is provided in a substantially orthogonal portion. .
- the gaps generated between the light guides are all A gap is formed in the continuous portion so that the light guides do not overlap.
- maintenance part adjoined which forms the said clearance gap so that the clearance gaps which can be made into the continuous part so that the said adjacent 2 light guides may not overlap may protrude from the substantially orthogonal part.
- the light guides of the four light guides are provided at symmetrical positions. Because of such a configuration, the distance holding unit can equalize the optical influence on the four adjacent emission surfaces, and the distance holding unit is a light emitting surface composed of a plurality of emission surfaces. Since the influence on the upper luminance distribution can be made uniform, the luminance uniformity of the light emitting surface can be improved.
- the distance holding unit is formed of a material having light transmittance and light diffusibility.
- the distance holding unit is formed of a material having a light transmitting property and a light diffusing property, the amount of light blocked by the distance holding unit and the amount of reflected light can be reduced. Can do.
- the distance holding unit does not hinder the progress of the light emitted from the light emitting surface, it is possible to suppress a decrease in luminance and a decrease in luminance uniformity.
- the optical sheet is preferably a diffusion plate.
- the light that is overlapped and made uniform in multiple directions can be further uniformed by the diffusion plate, so that the luminance is uniform. It is possible to realize a surface light source device with improved performance.
- a diffusion means for further diffusing light is provided in a region of the optical sheet including the place where the distance holding unit is disposed.
- the optical sheet is provided with diffusion means for further diffusing light so as to include a place where the optical sheet and the distance holding unit are in contact with each other, the distance holding unit It is possible to suppress the occurrence of luminance unevenness due to the presence of light and further reduce the luminance unevenness as a whole.
- the liquid crystal display device of the present invention is characterized by including the surface light source device as a backlight in order to solve the above problems.
- a thin liquid crystal display device having a good display quality and having a thin surface and having improved luminance uniformity as a backlight without causing a decrease in luminance is provided. Can be realized.
- the substrate has a distance holding unit for holding the light emitting surface and the optical sheet at a certain distance, and the two light guides adjacent to each other overlap. It is provided so that it may protrude from the gap which can be made into the continuous part so that it may not become.
- the liquid crystal display device of the present invention includes the surface light source device as a backlight.
- the surface light source device as a backlight, it is possible to realize a thin liquid crystal display device with good display quality.
- FIG. 1 It is sectional drawing which shows the fixing method of a distance holding
- a liquid crystal display device includes a surface light source device that is thin and has improved luminance uniformity without causing a reduction in luminance, and thus has good display quality and is thin. Liquid crystal display device. This will be described below with reference to FIGS.
- FIG. 1 is a side view showing a schematic configuration of a liquid crystal display device 10 according to an embodiment of the present invention.
- the liquid crystal display device 10 includes a liquid crystal display panel 21 and a surface light source device 41 including a lighting device 31 as a backlight that emits light toward the liquid crystal display panel 21.
- the illumination device 31 includes a plurality of combinations of the light guide 1 and the light source 2.
- the light guide 1 includes a light guide part 1a and a light emitting part 1b.
- the light guide part 1a guides the light from the light source 2 to the light emitting part 1b and causes the light emission part 1b to emit surface light.
- a plurality of such light guides 1 are arranged adjacent to each other, and the light guide part 1a of one of the light guides 1 is provided with one of the light guides 1a so that a plurality of light emission surfaces 1c can form a large flush surface.
- Each light guide 1 is configured to have a shape in which the light emitting portion 1b of the other light guide 1 adjacent to the other light guide 1 can be mounted.
- the reflective sheet 3 is provided in the back surface (surface on the opposite side to the said output surface 1c) of the light guide 1.
- the surface light source device 41 (backlight) further includes a substrate 4 that supports the illumination device 31, an optical sheet 5 disposed behind the liquid crystal display panel 21 (on the side opposite to the display surface), and an optical sheet. And a distance holding unit 6 that separates 5 from the emission surface 1c at a constant interval.
- the emission surface 1c and the back surface of the optical sheet 5 face each other with a predetermined interval, and the back surface of the optical sheet 5 is an irradiation target surface of light emitted from the emission surface 1c.
- FIG. 2 is a plan view of the illumination device 31 provided in the liquid crystal display device 10 according to the embodiment of the present invention as viewed from the exit surface 1c side.
- FIG. 3 is a side view of the lighting device 31.
- FIG. 4 is a perspective view of the illumination device 31.
- the light guide 1 is generally manufactured with a minus tolerance in consideration of damage between the light guides, thinning of the lighting device, manufacturing errors, and the like.
- a gap with a minus tolerance is generated in the joint portion, and such a gap appears as a non-light emitting area on the light emitting surface formed by connecting the light emitting surfaces of the light guide. Therefore, when an illuminating device including a plurality of light guides is used as a backlight of a display device in this way, various kinds of improvements can be made to improve the quality of a display image so that luminance unevenness does not occur on the light emitting surface. Need to be creative.
- the gaps are not overlapped by adjacent light guides 1 as will be described in detail below, depending on the generation mechanism.
- a gap 8 that can be formed in a continuous portion
- a gap 9 that can be formed in a continuous portion so that adjacent light guides 1 overlap.
- the light emitting portion 1 b of the other light guide 1 adjacent to the light guide 1 a of the one light guide 1 is arranged so as to ride on.
- the direction is referred to as the D1 direction.
- the light guides 1 are connected so as to overlap each other.
- a direction intersecting (substantially orthogonal) with the D1 direction is referred to as a D2 direction.
- the light guides 1 are connected so as not to overlap.
- the gap 8 that can be a continuous portion so that the light guides 1 do not overlap each other refers to a gap 8 that is generated when each light guide 1 is continuous in the D2 direction, as shown in FIGS. That is, when the light guides 1 are continuous in the D2 direction, there is no overlapping portion between the adjacent light guides 1.
- the gap 9 that can be formed so that the light guides 1 are overlapped with each other is connected to the light guide part 1 a of one light guide 1 and to the one light guide 1.
- the joint between the exit surface 1c of the one light guide 1 and the exit surface 1c of the other light guide 1 is provided.
- the gap 9 is indicated. That is, as shown in FIG. 2 and FIG. 4, the gap 9 that is generated when each light guide 1 is continuous in the D1 direction is shown.
- the illuminating device 31 provided in the liquid crystal display device 10 has the light guide portion 1a of one light guide 1 on the other side adjacent to the one light guide 1.
- the tandem illumination device is arranged so that the light emitting part 1b of the light guide 1 is ridden.
- the tandem illumination device the light guide 1 and the gap 8 formed in a continuous portion so as not to overlap with each other
- the reason why the luminance uniformity of the illuminating device 31 is lowered is not limited to the above-described gaps 8 and 9 between the light guides. For example, there are many reasons such as the light emission characteristics of the light source and the shape of the light guide. .
- the exit surface 1c and the optical sheet 5 to be irradiated are separated from each other.
- a configuration in which the holding unit 6 is separated by a certain distance is used.
- the distance holding unit 6 can provide a certain space between the light emitting surface composed of a plurality of emission surfaces 1 c and the optical sheet 5, the distance between the light emitting surface and the optical sheet 5. In the space between them, the light emitted from the emission surface 1c overlaps and is made uniform in multiple directions, so that the luminance uniformity can be improved.
- the distance holding unit 6 can provide the optical sheet 5 at a certain distance from the light guide 1 as compared with the configuration in which the optical sheet is in close contact with the light guide, in addition to the effect of improving luminance unevenness. Therefore, the structure is also suitable for protecting the surface of the optical sheet 5.
- the distance holding unit 6 is preferably provided in a low luminance region on the light emitting surface composed of the plurality of emission surfaces 1c. This is because the ratio of the light reflected by the distance holding unit 6 out of the light emitted from the light emitting surface can be reduced, and the influence of the distance holding unit 6 on the luminance distribution on the light emitting surface is reduced. This is because it can be suppressed.
- the gap 8 or the gap 9 as a non-light emitting area corresponds to such a low luminance area.
- the distance holding unit 6 can be provided on a vertical line where the gap 8 is formed.
- the substrate 4 for mounting the light source 2 is mounted on the substrate 4.
- the adjacent two gaps 8 adjacent to the gaps 8 formed so that the two adjacent light guides 1 do not overlap with each other. It is preferable to provide a gap 9 that can be a continuous portion so that two light guides 1 overlap each other so that the distance holding portion 6 protrudes from a substantially orthogonal portion.
- maintenance part 6 is a part which continues so that the said two light guides 1 adjacent to the clearance gap 8 which can be made into the part connected so that the said adjacent two light guides 1 may not overlap may overlap.
- the gap 9 that can be formed is provided at a symmetrical position with respect to the light emitting portions 1b of the four adjacent light guides 1 that form the gaps 8 and 9 so as to protrude from the substantially orthogonal portion. Because of such a configuration, the distance holding unit 6 can equalize the optical influence exerted on the four adjacent exit surfaces 1c, so that the luminance of the light emitting surface composed of the plurality of exit surfaces 1c is increased. Uniformity can be improved.
- FIG. 1 schematically shows the traveling direction of light emitted from the light emitting surface formed of the emission surface 1c of each light guide 1 in the liquid crystal display device 10 of the present embodiment.
- a distance holding unit 6 is provided to increase the distance between the light emitting surface made up of the plurality of light emitting surfaces 1c and the optical sheet 5, thereby allowing the light emitted from the light emitting surface to be converted into the optical surface. It becomes possible to irradiate the sheet 5 uniformly.
- the distance holding unit 6 in order to prevent light from being blocked or reflected from the distance holding unit 6, is made of a material having a light transmitting property and a light diffusing property. Forming. In this way, by forming the distance holding unit 6 with a material having a light transmitting property and a light diffusing property, it is possible to reduce the amount of light blocked by the distance holding unit 6 and the amount of reflected light. it can. In addition, since the distance holding unit 6 does not hinder the progress of the light emitted from the light emitting surface, it is possible to suppress a decrease in luminance and a decrease in luminance uniformity.
- Examples of the light transmissive and light diffusive material include a material in which particles formed of a light scattering material such as titanium oxide or barium sulfate are mixed in a transparent resin such as acrylic or polycarbonate. Can be mentioned.
- FIG. 5 is a diagram exemplarily showing the shape of the side surface of the distance holding portion and the shape of the lower surface (the surface fixed to the substrate).
- FIG. 5 shows a conical distance holding portion whose side surface is an isosceles triangle section and whose lower surface is a circular shape.
- the shape of the surface in contact with the optical sheet 5 has a relatively narrow tip so that the contact area with the optical sheet 5 becomes small. In order to satisfy this shape, it is not necessary to limit to a conical shape, and a truncated cone shape may be adopted.
- FIG. 5B shows a columnar distance holding portion in which the cross section of the side surface is a columnar shape, and the shapes of the upper surface (the surface in contact with the optical sheet 5) and the lower surface are both circular. .
- (C) of FIG. 5 shows a prismatic distance holding portion in which the cross section of the side surface, the upper surface, and the lower surface are all columnar.
- the shape of the distance holding unit 6 is not limited to the above example, but in consideration of light scattering, the contact area with the optical sheet 5 that is an optical member is the optical sheet 5 and the liquid crystal display. If it is a grade which does not have a problem in supporting the panel 21, the smaller one is preferable.
- the distance holding unit 6 isotropic. Therefore, a rotating body is preferable. Therefore, the rectangular column shape of FIG. The conical shape, the truncated cone shape, and the cylindrical shape shown in 5 (b) are preferable.
- FIG. 6 is a cross-sectional view exemplarily illustrating a fixing method between the optical sheet 5 and the distance holding unit 6. This fixing method can also be applied to fixing the substrate 4 and the distance holding unit 6 as will be described later.
- a part of the distance holding portion 6a having a columnar shape shown in FIG. 5B is inserted into a cylindrical hole formed in the optical sheet 5, and is bonded by the transparent adhesive 13. A fixed structure is shown.
- FIG. 6B shows a structure in which the distance holding portion 6 whose tip is partially narrowed so as to be inserted in close contact with the hole formed in the optical sheet 5 is fixed to the optical sheet 5. Show.
- the fixing method shown in FIG. 6B that does not require the use of the transparent adhesive 13 is used.
- the optical sheet 5 placed on the upper surface of the distance holding unit 6 moves and is displaced. Unless this occurs, it is not always necessary to fix the distance holding unit 6 and the optical sheet 5 with an adhesive or the like.
- the interval at which the distance holding unit 6 is provided is not particularly limited.
- the distance holding unit 6 may be provided at each intersection between the gap 8 and the gap 9, but from the viewpoint of minimizing the influence of the distance holding unit 6 causing uneven brightness, the exit surface 1 c and the optical sheet 5
- the distance at which the distance holding unit 6 is provided may be determined in consideration of a balance with the viewpoint of keeping the distance constant. For example, when used for a backlight of a general liquid crystal display device for home use (for example, about 30 inches), it may be formed at intervals of several tens of centimeters both vertically and horizontally.
- the distance between the light emitting surface composed of the plurality of emission surfaces 1c and the optical sheet 5 is set to 3.0 mm. Accordingly, the height of the distance holding unit 6 may be determined in consideration of the distance from the substrate 4 to the light emitting surface and the height of the portion inserted into the hole formed in the optical sheet 5 and the substrate 4.
- the substrate 4 is provided with a distance holding unit 6 for holding the light emitting surface and the optical sheet 5 at a constant distance.
- FIG. 7 is a cross-sectional view exemplarily illustrating a method of fixing the distance holding unit and the substrate.
- FIG. 7A a part of the distance holding portion 6a having the columnar shape shown in FIG. 5B is inserted into a cylindrical hole formed in the substrate 4 and bonded and fixed by the adhesive 14.
- FIG. The structure is shown.
- FIG. 7B shows a structure in which the distance holding portion 6 whose tip is partially narrowed so as to be inserted in close contact with the hole formed in the substrate 4 is fixed to the substrate 4. Yes.
- the distance holding unit and the substrate are fixed by using the method shown in FIG. 7B, which does not require the use of the adhesive 14 in terms of workability.
- the substrate 4 is for arranging the light source 2 and is preferably white for improving the luminance.
- a driver for controlling lighting of each LED constituting the light source 2 is mounted on the back surface (surface opposite to the surface on which the light source 2 is mounted) of the substrate 4. Yes. That is, the driver is mounted on the same substrate 4 together with the LEDs.
- the number of substrates can be reduced, and connectors and the like connecting the substrates can be reduced, so that the cost of the apparatus can be reduced. Further, since the number of substrates is small, the liquid crystal display device 10 can be thinned.
- the position of the hole formed in the substrate 4 can be determined from the position of the light source 2 disposed on the substrate 4 and the shape of the light guide 1.
- the optical sheet 5 is configured by at least a diffusion plate that diffuses received light to improve the uniformity of luminance, and is preferably configured by combining a composite function optical sheet with the diffusion plate.
- the composite functional optical sheet has a plurality of optical functions selected from various optical functions including diffusion, refraction, condensing, and polarization.
- a diffusion plate having a thickness of about 2 to 3 mm disposed at a location about several mm away from the illumination device 31 can be adopted.
- the thickness of the diffusion plate and the distance from the illumination device 1 are not limited to the above.
- the diffusion plate is disposed opposite to the light emitting surface at a predetermined distance from the light emitting surface by the distance holding unit 6 so as to cover the entire light emitting surface formed by connecting a plurality of emission surfaces 1c.
- the diffusion plate diffuses light emitted from the light emitting surface.
- a diffusion sheet of about several hundred ⁇ m, a prism sheet, or a polarizing reflection sheet is provided on the upper surface of the diffusion plate so as to ensure even better luminance and luminance uniformity.
- a multi-function optical sheet such as may be laminated.
- the composite functional optical sheet is composed of a plurality of stacked sheets, and uniformizes and collects the light emitted from the emission surface 1c of the light guide 1 and irradiates the liquid crystal display panel 21 with the light. .
- the composite functional optical sheet includes a diffusion sheet that condenses and scatters light, a lens sheet that condenses light and improves luminance in the front direction (direction of the liquid crystal display panel 21), and one of the light
- a polarized light reflecting sheet that improves the luminance of the liquid crystal display device 10 by reflecting one of the polarized light components and transmitting the other polarized light component can be applied. These are preferably used in appropriate combination depending on the price and performance of the liquid crystal display device 10.
- liquid crystal display device 10 according to an embodiment of the present invention will be further described with reference to FIG.
- the reflection sheet 3 described above is provided on the opposite side of the light guide body 1 from the surface having the emission surface 1 c so as to individually cover the opposite surface. At the same time, the light that passes through the opposite surface of each of the light guides 1 is reflected and returned to the light guide 1, thereby improving the light use efficiency of each light guide 1. ing. More specifically, the reflection sheet 3 is made of a material constituting the light guide 1 with respect to the normal of the surface opposite to the surface having the exit surface 1c of each light guide 1. By making the incident light below the determined total reflection critical angle, the light that passes through the light guide 1 is reflected and returned to the light guide 1.
- the light guide 1 efficiently emits the light incident from the incident surface 1 d facing the light source 2 from the output surface 1 c. It is necessary to minimize the loss of light in one light guide portion 1a.
- the incident light is guided in the light guide portion 1a while satisfying the total reflection condition, thereby maintaining the light quantity. It is the structure which can do.
- the illumination device 31 of the present invention is combined with the optical sheet 5 to achieve uniform surface light emission.
- the distance from the emission surface 1c to the optical sheet 5 can be easily made constant, so that the optical design for uniform surface emission becomes easy. Can be created.
- the emission surface 1 c is formed on the light guide 1 in the emission direction. It is not parallel to the surface opposite to the surface 1c. For this reason, the shape of the light emitting portion 1b is formed so as to become narrower as the distance from the light source 2 increases, that is, the surface on the opposite side asymptotically approaches the emission surface 1c.
- the light guided through the light guide 1 gradually exits the total reflection condition as it moves away from the light source 2, and is emitted from the emission surface 1c. It will be.
- the surface (light-emitting surface 1c) or the back surface of the light-emitting portion 1b is subjected to processing (fine unevenness processing) or processing for emitting the guided light.
- processing method and processing method include prism processing, texture processing, and printing processing, but are not particularly limited, and known methods can be used as appropriate.
- the light guide 1 may be formed of a transparent resin such as polycarbonate (PC) or polymethyl methacrylate (PMMA), but is not limited thereto, and is formed of a material generally used as a light guide. can do.
- the light guide 1 can be formed by, for example, injection molding, extrusion molding, hot press molding, cutting, or the like. However, it is not limited to these methods, and any method may be used as long as it is a processing method that exhibits the same characteristics.
- the light source 2 is disposed along the end of the light guide 1a of the light guide 1 as shown in FIG. Although the type is not particularly limited, in the present embodiment, a light emitting diode (LED) which is a point light source is used as the light source 2.
- LED light emitting diode
- the light source 2 a light source composed of a plurality of types of light emitting diodes having different emission colors can be used. Specifically, it is composed of an LED group in which a plurality of light emitting diodes of three colors of red (R), green (G), and blue (B) are arranged. By configuring the light source 2 by combining the light emitting diodes of these three colors, it is possible to irradiate white light on the emission surface 1c.
- the combination of the colors of the light emitting diodes can be appropriately determined based on the coloring characteristics of the LEDs of the respective colors and the coloring characteristics of the surface light source device 41 desired according to the purpose of use of the liquid crystal display device 10. .
- a side light emitting type LED in which LED chips of respective colors are molded in one package may be used. Thereby, it becomes possible to obtain the illuminating device 31 with a wide color reproduction range.
- a transmissive liquid crystal display panel that performs display by transmitting light from the surface light source device 41 (backlight) is used as the liquid crystal display panel 21.
- the structure of the liquid crystal display panel 21 is not specifically limited, A well-known liquid crystal display panel can be applied suitably.
- the liquid crystal display panel 21 includes, for example, an active matrix substrate on which a plurality of TFTs (thin film transistors) are formed, and a color filter substrate facing the active matrix substrate, and a liquid crystal layer is sealed between these substrates. It has the structure enclosed with the material.
- the location of the distance holding unit 6 in the optical sheet 5 is set.
- a diffusion means 15 for further diffusing light is provided in the included region.
- Examples of the method for providing the diffusing means 15 include roughening the surface by forming fine irregularities on the surface of the optical sheet 5 in the same manner as the surface treatment of the light emitting portion 1b described above.
- the optical sheet 5 is provided with the diffusing means 15 for further diffusing light so as to include a place where the optical sheet 5 and the distance holding unit 6 are in contact with each other.
- the occurrence of uneven brightness due to the presence of the distance holding unit 6 can be suppressed, and the uneven brightness as a whole can be further reduced.
- the liquid crystal display device 10 includes a surface light source device 41 that is thin and has improved luminance uniformity as a backlight without causing a decrease in luminance.
- the thin liquid crystal display device 10 can be realized.
- FIG. 8 is a front view of an illuminating device 31a provided in a liquid crystal display device according to another embodiment of the present invention as viewed from the exit surface 11a side.
- FIG. 9 is a cross-sectional view taken along line AA of the illumination device 31a shown in FIG.
- the light guide 11 emits light emitted from the light sources 2L and 2R from the emission surface 11a.
- the light emission surface comprised by connecting the some output surface 11a is a surface for irradiating light with respect to irradiation object.
- the other components are substantially the same as those in the first embodiment, and thus the description thereof is omitted.
- At least two light guides 11 constituting the illumination device 31a are configured. That is, the illuminating device 31a is configured by combining the light guide 11 and the light source 2 and arranging them on the same plane.
- each light guide 11 is arrange
- Each light emission surface 11a of the light guide 11 forms a light emitting surface in a flush manner.
- a plurality of light guides 11 having two point light sources 2L and 2R are arranged vertically and horizontally.
- the lighting device 31a is called a tile-type lighting device because the plurality of light guides 11 having the two point light sources 2L and 2R are arranged side by side so as to spread tiles.
- the two point light sources 2 ⁇ / b> L and 2 ⁇ / b> R are exemplarily described by using a configuration in which the rectangular light guides 11 are arranged in the vicinity of the central portions of the two opposing sides.
- the number and arrangement of the point light sources can be appropriately selected as necessary.
- the direction in which the two point light sources 2L and 2R are opposed to each other is called the D1 direction, and intersects this D1 direction (substantially orthogonal). Direction) is called the D2 direction.
- each of the point light sources 2L and 2R is housed in a hollow recess 11b provided inside the light guide 11, and arranged so as to face each other. ing.
- Each of the point light sources 2L and 2R is placed on the substrate 12.
- the light emission directions from the respective point light sources 2L and 2R are such that the light from one point light source is irradiated toward the other point light source.
- the light emission direction from the light sources 2L and 2R is set.
- the two opposing point light sources 2L and 2R are arranged so as to compensate for areas where they cannot irradiate each other.
- the point light sources 2L and the point light sources 2R are arranged so as to face each other so that light from the respective point light sources enters the light guide 11, thereby superimposing the light emitting regions of the respective point light sources.
- light emission can be obtained from the entire exit surface 11 a of the light guide 11.
- a large-sized backlight having no dark part can be obtained by using such an illumination device 31a.
- the light emitted from the point light sources 2L and 2R propagates through the light guide 11 while receiving the scattering action and the reflection action, exits from the exit surface 11a, and passes through the optical sheet 5 described above.
- the configuration reaches the liquid crystal display panel 21.
- a gap 8 due to the minus tolerance is generated in a portion where the light guides 11 do not overlap each other. That is, when the light guides 11 are connected in the D1 direction or the D2 direction, the gap 8 described above is generated.
- the distance holding unit 6 is preferably provided in a low-luminance region on the light emitting surface composed of the plurality of emission surfaces 11a.
- the gap 8 which becomes a non-light emitting area corresponds to such a low luminance area.
- the distance holding portion 6 can be provided on the vertical or horizontal line where the gap 8 is formed.
- the distance holding unit 6 does not overlap the two light guides 11 adjacent to each other.
- the gaps 8 that can be formed in continuous portions are provided at symmetrical positions with respect to the emission surfaces 11a of the four adjacent light guides 11 that form the gap 8 so that the gaps 8 protrude from the substantially orthogonal portions.
- it is.
- maintenance part 6 can make equal the optical influence which it has with respect to the said adjacent 4 output surface 11a, and the said distance holding
- the present invention can be applied to a surface light source device used as a backlight of a liquid crystal display device and a liquid crystal display device including the surface light source device.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
導光体は、導光体同士の損傷、照明装置の薄型化、製造上の誤差等を考慮して、マイナス公差で製造されるのが一般的であり、そのため、導光体間の継ぎ目部分には、マイナス公差分の隙間が生じる。このような隙間は、上記導光体の出射面が連なって形成される発光面上においては、非発光領域となるため、輝度の低い領域となる。
図1は、本発明の一実施の形態の液晶表示装置10の概略構成を示す側面図である。
以下、図2~4を参照して、本発明の一実施の形態の液晶表示装置10に備えられた照明装置31の構成の詳細と、照明装置31の輝度均一性とについて説明する。
上記距離保持部6は、複数の出射面1cからなる発光面上において、輝度の低い領域に設けることが好ましい。なぜなら、上記発光面から出射される光のうち、上記距離保持部6により反射される光の割合を少なくすることができ、上記距離保持部6が、発光面上の輝度分布に与える影響を小さく抑えることができるからである。
本実施の形態においては、上記基板4には、上記発光面と上記光学シート5とを一定の距離に保持するための距離保持部6が設けられている。
光学シート5は、少なくとも、受光した光を拡散して輝度の均一性を向上させる拡散板によって構成されており、好ましくは、拡散板に複合機能光学シートを組み合わせて構成されている。上記複合機能光学シートは、拡散、屈折、集光および偏光を含む各種光学的機能から選択された複数の光学的機能を備えている。
つぎに、図8および図9に基づいて、本発明の第2の実施形態について説明する。なお、本実施の形態において説明すること以外の構成は、上記実施の形態1と同じである。また、説明の便宜上、上記の実施の形態1の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
1a 導光部
1b 発光部
1c、11a 出射面
2、2L、2R 光源
4、12 基板
5 光学シート
6 距離保持部
8、9 隙間
10 液晶表示装置
15 拡散手段
31、31a 照明装置
41 面光源装置
Claims (7)
- 光源と該光源からの光を拡散させて面発光させる導光体との組み合わせを複数個備え、
さらには、上記光源を実装するための基板を備えているとともに、上記各導光体の出射面からなる発光面上に、光学シートを備えている面光源装置において、
上記基板には、上記発光面と上記光学シートとを一定の距離に保持するための距離保持部が、隣接する上記2つの導光体が重ならないように連なる部分にできる隙間から突出するように、設けられていることを特徴とする面光源装置。 - 上記各導光体は、出射面を有する発光部と、該発光部へ上記光源からの光を導く導光部とを有し、一方の導光体の導光部に、該一方の導光体に隣り合う他方の導光体の発光部が乗り上げるように配置され、
上記距離保持部が、隣接する上記2つの導光体が重ならないように連なる部分にできる隙間と隣接する上記2つの導光体が重なるように連なる部分にできる隙間とが、略直交する部分から突出するように、設けられていることを特徴とする請求項1に記載の面光源装置。 - 上記各導光体同士は、互いに重ならないように同一平面上に並んで配置され、
上記距離保持部が、隣接する上記2つの導光体が重ならないように連なる部分にできる隙間同士が、略直交する部分から突出するように、設けられていることを特徴とする請求項1に記載の面光源装置。 - 上記距離保持部は、光透過性および光拡散性を有する材料で形成されていることを特徴とする請求項1から3の何れか1項に記載の面光源装置。
- 上記光学シートが、拡散板であることを特徴とする請求項1から4の何れか1項に記載の面光源装置。
- 上記光学シートにおける、上記距離保持部の配置場所を含む領域には、光をさらに拡散させるための拡散手段が設けられていることを特徴とする請求項1から5の何れか1項に記載の面光源装置。
- 請求項1から6の何れか1項に記載の面光源装置をバックライトとして備えていることを特徴とする液晶表示装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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US13/125,828 US8427600B2 (en) | 2008-11-04 | 2009-07-14 | Surface light source apparatus and liquid crystal display apparatus |
RU2011120413/07A RU2487294C2 (ru) | 2008-11-04 | 2009-07-14 | Плоский источник света и жидкокристаллический дисплей |
CN2009801429365A CN102197257A (zh) | 2008-11-04 | 2009-07-14 | 面光源装置和液晶显示装置 |
EP09824655.6A EP2351959A4 (en) | 2008-11-04 | 2009-07-14 | Planar light source device and liquid crystal display device |
BRPI0920050A BRPI0920050A2 (pt) | 2008-11-04 | 2009-07-14 | aparelho de fonte iluminação de superfície e aparelho visor de cristal líquido |
JP2010536711A JP5107438B2 (ja) | 2008-11-04 | 2009-07-14 | 面光源装置および液晶表示装置 |
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JP2008-283638 | 2008-11-04 | ||
JP2008283638 | 2008-11-04 |
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PCT/JP2009/062761 WO2010052955A1 (ja) | 2008-11-04 | 2009-07-14 | 面光源装置および液晶表示装置 |
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US (1) | US8427600B2 (ja) |
EP (1) | EP2351959A4 (ja) |
JP (1) | JP5107438B2 (ja) |
CN (1) | CN102197257A (ja) |
BR (1) | BRPI0920050A2 (ja) |
RU (1) | RU2487294C2 (ja) |
WO (1) | WO2010052955A1 (ja) |
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JP2013120360A (ja) * | 2011-12-08 | 2013-06-17 | Sharp Corp | 表示装置 |
KR101592071B1 (ko) | 2012-12-19 | 2016-02-05 | 독터. 인제니어. 하.체. 에프. 포르쉐 악티엔게젤샤프트 | 자동차 조명기구 및 자동차 조명기구를 갖는 자동차 |
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RU2628230C1 (ru) * | 2016-06-28 | 2017-08-15 | Алексей Викторович Шторм | Устройства и способы оптической передачи данных в светодиодном экране |
WO2019052294A1 (en) * | 2017-09-12 | 2019-03-21 | Nanoleaf Energy Technology Shenzhen Limited | SYSTEM AND METHODS FOR PERFORMING COUPLED LIGHTING PANELS |
JP2019147440A (ja) * | 2018-02-26 | 2019-09-05 | テイ・エス テック株式会社 | 照明装置 |
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CN102197257A (zh) | 2011-09-21 |
JP5107438B2 (ja) | 2012-12-26 |
BRPI0920050A2 (pt) | 2015-12-15 |
EP2351959A1 (en) | 2011-08-03 |
US20110199559A1 (en) | 2011-08-18 |
RU2487294C2 (ru) | 2013-07-10 |
EP2351959A4 (en) | 2013-04-10 |
US8427600B2 (en) | 2013-04-23 |
JPWO2010052955A1 (ja) | 2012-04-05 |
RU2011120413A (ru) | 2012-12-20 |
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