WO2005050085A1 - 面光源装置及び当該装置を用いた機器 - Google Patents
面光源装置及び当該装置を用いた機器 Download PDFInfo
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- WO2005050085A1 WO2005050085A1 PCT/JP2004/016873 JP2004016873W WO2005050085A1 WO 2005050085 A1 WO2005050085 A1 WO 2005050085A1 JP 2004016873 W JP2004016873 W JP 2004016873W WO 2005050085 A1 WO2005050085 A1 WO 2005050085A1
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- Prior art keywords
- light source
- light
- source device
- guide plate
- arrangement
- Prior art date
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Classifications
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
-
- 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
Definitions
- the present invention relates to a surface light source device and a device using the device.
- the present invention relates to a surface light source device used as a backlight or a front light of an image display device, a lighting device, or the like.
- the present invention relates to an apparatus using the surface light source device.
- FIGS. 1 and 2 show an exploded perspective view and a cross-sectional view of a surface light source device having a general structure.
- the surface light source device 1 is used as a knock light, and includes a light guide plate 2 for confining light, a light emitting unit 3 and a reflection plate 4.
- the light guide plate 2 is formed of a transparent resin having a large refractive index such as polycarbonate resin or methacrylic resin, and the lower surface of the light guide plate 2 is provided with a diffusion pattern 5 by uneven processing or dot printing of diffuse reflection ink. Is formed.
- the light emitting section 3 is one in which a plurality of LEDs (light emitting diodes) 7 are mounted on a circuit board 6, and faces the side surface (light incident surface 2A) of the light guide plate 2.
- the reflection plate 4 is formed of a white resin sheet, and both sides are adhered to the lower surface of the light guide plate 2 by a double-sided tape 8.
- a surface light source device As shown in FIG. 2, light emitted from the light emitting unit 3 and guided into the light incident surface 2 A power light guide plate 2 It progresses while repeating total reflection between the upper surface (light emitting surface 2B) and the lower surface.
- the light When the light enters the diffusion pattern 5, the light is diffusely reflected.
- the light When the light enters the light emission surface 2B at an angle smaller than the critical angle of total reflection, the light is emitted to the outside of the light emission surface 2B. That is, in such a surface light source device 1, the diffusion pattern is a pseudo light source, and these are gathered to form a surface light source.
- the surface light source device 1 having a structure as shown in Fig. 1 has a simple structure, but its light use efficiency is low due to its structure. Only about 20% of the light emitted from the LED 7 is used for the light guide plate 2. The light emitting surface 2B could not emit the force.
- the light emitting unit 3 having a plurality of LEDs 7 is used, it is difficult to reduce the size of the light emitting unit 3 and the power consumption of the surface light source device 1 cannot be reduced. Therefore, a surface light source device 11 using one LED and having a structure as shown in FIG. 3 has been proposed.
- the light guide plate 12 used in the surface light source device 11 has a non-light emitting region 14 provided around a rectangular light emitting region 13 used as a light source.
- a single point light source-like light-emitting portion 15 using an LED is housed.
- a large number of deflection patterns 16 are formed concentrically around the light emitting portion 15. The interval between the deflection patterns 16 is smaller on the side closer to the light emitting unit 15 as the distance from the light emitting unit 15 is relatively wide, so that the surface luminance in the light emitting region 13 is made constant.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-243822
- each deflection pattern 16 shown in FIG. 4 has substantially the same length in the circumferential direction, is arranged at regular intervals in the circumferential direction, and is also arranged at regular intervals in the radial direction. Further, the deflection patterns 16 shown in FIG. 5 are arranged at regular angles in the circumferential direction, and each deflection pattern 16 has a length corresponding to the distance from the center point (light source position). I have.
- the spread of the light 17 reflected by the pattern arrangement as shown in FIG. 4 and emitted from the surface light source device 11 is as shown by the broken line in FIG.
- the light 17 overlaps in a certain part and the light 17 hardly overlaps in a certain part.
- the emission intensity characteristic 18 along the line the emission intensity is large in the portion where the overlap is large, and the emission intensity is small in the portion where the overlap is small.
- the red pixel R has a phenomenon in which light with a low emission intensity 17 appears to be colored blue without passing through the power, and the pixels of each color do not emit light uniformly, causing a glare phenomenon on the liquid crystal display surface.
- the deflection patterns 16 are arranged at every constant angle in the circumferential direction, but are randomly arranged in the radial direction.
- the overall pattern is not uniform. Therefore, even in the pattern arrangement as shown in FIG. 5, screen glare and uneven brightness occur, and the image quality deteriorates.
- the distance between the deflection patterns 16 is reduced by reducing the size of each deflection pattern 16, the period of change in the light emission intensity can be made smaller than the pixel pitch of the liquid crystal display panel.
- the deflection pattern 16 is further miniaturized, and the fabrication of the deflection pattern 16 becomes difficult. Therefore, the shape error of the deflection pattern 16 becomes relatively large, and the brightness decreases. It is not practical.
- the angles of the light emitting portions 20 are completely aligned in a specific direction, and only the light emission in a specific direction is not visually beautiful because the eyes are not uniform.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-243822
- the present invention has been made in view of the above technical background, and an object of the present invention is to provide an image display device such as a liquid crystal display device that is used for image display, such as screen glare and uneven brightness. It is an object of the present invention to provide a surface light source device capable of suppressing the above.
- Another object of the present invention is to provide a surface light source device capable of uniformly arranging the light emitting units as a whole when manufacturing a surface light source device having a circular shape or the like. Means for solving the problem
- a first surface light source device of the present invention is a surface light source device in which a plurality of light sources are arranged on a two-dimensional or three-dimensional surface.
- the arrangement is a regular arrangement, and the arrangement direction and the distance between the light sources are characterized by gradually changing as they move along the arrangement direction.
- the connecting linear force connecting the light sources along the arrangement direction is rotationally symmetric about a certain point, and And the distance between the light sources is gradually changed in accordance with the distance of the center point force.
- two arrangement directions at the position with respect to a line connecting the position and the center point are different. It is asymmetric.
- the second surface light source device of the present invention is a surface light source device in which a plurality of light sources are arranged in a two-dimensional or three-dimensional surface.
- the connection line connecting the light sources along the arrangement direction is a spiral around a certain point, and the numbers of the two types of spirals having different directions are Na, Nb (however, Na and Nb) Then,
- the number of the light sources disposed per unit area is substantially constant regardless of the location.
- the number of the light sources disposed per unit area is substantially constant regardless of the location.
- the light sources are arranged in a circular area.
- the light sources are arranged in a circular area.
- a light guide plate for spreading the light introduced from the actual light source over substantially the entire light exit surface and emitting the light from the light exit surface,
- pseudo light sources that can be regarded as the light sources are arranged.
- a plurality of patterns for reflecting light guided inside the light guide plate are provided on a surface of the light guide plate opposite to the light exit surface, and the plurality of patterns are provided by the patterns.
- the pseudo light source may be configured.
- the actual light source is smaller than the light guide plate, and the pseudo light source has a shape that is long in one direction, and is arranged concentrically around the center point of the arranged light sources. May be.
- the light source plate includes a light guide plate that spreads light introduced from the actual light source over substantially the entire light exit surface and emits the light from the light exit surface, On the light guide plate, pseudo light sources that can be regarded as the light sources are arranged.
- a plurality of patterns for reflecting the light guided inside the light guide plate are further provided on a surface of the light guide plate opposite to the light exit surface, and the plurality of patterns are provided by the patterns.
- the pseudo light source may be configured.
- the actual light source is smaller than the light guide plate, and the pseudo light source has a shape that is long in one direction, and is arranged concentrically around the center point of the arranged light sources. May be.
- the third surface light source device of the present invention is a surface light source device in which a plurality of light sources are two-dimensionally arranged. Then, when the distance from a certain point is R, the angle measured from a certain direction passing through the point is 0, and the position of the light source is represented by coordinates (R, 0),
- Rm Rm-l + (1 / Rm-l)
- ⁇ m ⁇ m-l + ⁇ g
- the present invention proposes a novel arrangement of light sources (real light sources or pseudo light sources) in a surface light source device. That is, in the present invention, by having the configuration characterized by the above-mentioned first to third surface light source devices, the light sources can be uniformly arranged without bias. As a result, even when used together with a liquid crystal display panel, screen glare is less likely to occur, and deterioration in image quality can be suppressed. Further, luminance unevenness on the light emitting surface of the surface light source device can be reduced.
- the light source is used for a signal light, lighting, or the like, particularly, even when the light sources are arranged in a circular shape, a gap is formed between the designed light emitting region and the light source arrangement region. In addition, it does not occur that the light emitting points are connected in a specific direction and the light emitting points are not biased. Therefore, even when used for a signal light, lighting, and the like, a uniform and uniform light emitting surface can be obtained by using a plurality of light sources.
- FIG. 1 is an exploded perspective view showing a surface light source device having a general structure.
- FIG. 2 is a sectional view of the surface light source device shown in FIG. 1.
- FIG. 3 is a plan view showing a conventional surface light source device having another structure.
- FIG. 4 is a diagram showing an example of a pattern arrangement of a deflection pattern in the surface light source device shown in FIG.
- FIG. 5 is different in pattern arrangement of deflection patterns in the surface light source device shown in FIG. It is a figure showing an example.
- FIG. 6 is a diagram showing the directional angle of light emitted from the surface light source device.
- FIG. 7 is a view for explaining the reason why light glare occurs in the surface light source device having the pattern arrangement as shown in FIG.
- FIG. 8 is a diagram showing an example of the light emitting units arranged in a circle.
- FIG. 9 is a diagram showing another example of the light emitting units arranged in a circle.
- FIG. 10 is an exploded perspective view showing a configuration of a surface light source device according to Embodiment 1 of the present invention.
- FIG. 11 is a cross-sectional view of the surface light source device shown in FIG.
- FIG. 12 is a schematic rear view of a light guide plate in the surface light source device of the first embodiment.
- FIG. 13 is a cross-sectional view showing the structure of the light emitting unit.
- FIG. 14 is a diagram showing an arrangement of a deflection pattern on a light guide plate in Embodiment 1.
- FIG. 15 is an enlarged perspective view showing one deflection pattern.
- FIG. 16 is a diagram showing the relationship between the length dimension of the deflection pattern and the distance between the light emitting portions.
- FIG. 17 is a diagram showing a grid-like arrangement of deflection patterns.
- FIG. 18 is a diagram showing a diamond-shaped arrangement of deflection patterns.
- FIG. 19 is a diagram showing a basic pattern for determining the arrangement point of the deflection pattern in the first embodiment.
- FIG. 20 is a diagram showing a basic pattern when the number of right-handed spirals and the number of left-handed spirals are equal.
- FIG. 21 is a diagram showing a definition of an arrangement position (Rm, ⁇ m) of an m-th deflection pattern.
- FIG. 23 is a diagram showing distribution of arrangement points when the parameter Cm is set to lZRm-1.
- FIG. 25 is a diagram for explaining how to determine connection lines.
- FIG. 26 is an enlarged view showing a part of a conventional deflection pattern arrangement.
- FIG. 27 is an enlarged view showing a part of the arrangement of the deflection patterns according to the first embodiment.
- FIG. 28 shows the contrast of light intensity on the backlight using the conventional deflection pattern as shown in FIG. 26 and the light intensity on the backlight using the deflection pattern of the present embodiment as shown in FIG. It is a figure showing the contrast of intensity.
- FIG. 29 is a diagram showing a region of the basic pattern used for the light guide plate of FIG. 14.
- FIG. 30 is a schematic plan view showing a surface light source device according to Embodiment 2 of the present invention.
- FIG. 31 is a cross-sectional view of a surface light source device according to Embodiment 3 of the present invention.
- FIG. 32 is a diagram showing an arrangement position of a deflection pattern in the surface light source device shown in FIG. 31.
- FIG. 33 is a front view of a surface light source device according to Embodiment 4 of the present invention.
- FIG. 34 is a perspective view of a surface light source device according to Embodiment 5 of the present invention.
- FIG. 35 is a schematic sectional view showing a liquid crystal display device using the surface light source device of the present invention.
- FIG. 36 is a perspective view showing a mobile phone provided with the liquid crystal display device according to the present invention.
- FIG. 37 is a perspective view showing a portable information terminal provided with the liquid crystal display device according to the present invention.
- FIG. 38 is a front view showing an illuminated signboard using the surface light source device according to the present invention.
- FIG. 39 is a front view showing a traffic light using the surface light source device according to the present invention.
- FIG. 10 is an exploded perspective view showing a configuration of a surface light source device 21 according to Embodiment 1 of the present invention
- FIG. 11 is a sectional view thereof.
- the surface light source device 21 is used as a backlight of a liquid crystal display panel, and includes a light emitting part 22 having a point light source shape, a light guide plate 23, and a reflection sheet 24.
- the light emitting section 22 is embedded in a corner of the light guide plate 23.
- the reflection sheet 24 is made of aluminum foil, a white resin sheet, or the like, and is disposed so as to face the rear surface of the light guide plate 23.
- the light guide plate 23 is formed in a substantially rectangular plate shape from a transparent resin glass having a high refractive index, such as polycarbonate resin, acrylic resin, and methacryl resin.
- FIG. 12 is a schematic rear view of the light guide plate 23.
- a non-light emitting region 26 is formed around a rectangular surface light emitting region 25 serving as a substantial surface light source, and at an end of a short side of the rectangular light guide plate 23, Outside the surface light-emitting region 25 (that is, the non-light-emitting region 26), a hole 27 for fitting the light-emitting portion 22 is opened.
- the light emitting section 22 is a resin mold of an LED chip, is mounted on a film wiring board (FPC) 31 for supplying power to the light emitting section 22, and is inserted into a hole 27 of the light guide plate 23. I have.
- FIG. 13 is a cross-sectional view showing the structure of the light emitting section 22.
- the light emitting section 22 has a structure in which an LED chip 28 is sealed in a transparent resin 29 and the surface other than the front surface is covered with a white transparent resin 30.
- the light emitting section 22 is mounted on a film wiring board 31 and fixed by solder 32. Further, the film wiring board 31 is fixed to a reinforcing plate 33 made of glass epoxy resin.
- the holes 27 for receiving the light emitting portions 22 penetrate vertically as described above, and positioning pins 37 are provided on the lower surface of the light guide plate 23 in the vicinity of the holes 27. It is projected.
- the film wiring board 31 and the reinforcing plate 33 are provided with through holes 37A and 37B through which the positioning pins 37 pass.
- an ultraviolet curing adhesive (a thermosetting adhesive may be applied) 38 is applied to the lower surface of the light guide plate 23 around the base of the positioning pin 37, and the positioning pin 37 is filmed. After passing through the through holes 37A and 37B of the wiring board 31 and the reinforcing plate 33 and positioning the center of the light guide plate 23 in the thickness direction and the light emission center of the light emitting part 22 with a CCD camera or the like, it is irradiated with ultraviolet light and cured by ultraviolet light. The light guide plate 23 and the light emitting section 22 are bonded by hardening the mold adhesive 38, and the positioning pins 37 are thermally attached to the reinforcing plate 33.
- a thermosetting adhesive may be applied
- light is emitted by a projection 39 provided on the inner surface of the hole 27 of the light guide plate 23 (either on the rear side, on the front side, or on both sides).
- the center of the part 22 may be positioned.
- a step is used to position the upper surface of the light guide plate 23 and the upper surface of the light emitting unit 22 in a state where the light guide plate 23 and the light emitting unit 22 are turned upside down.
- the center of the light plate 23 and the center of the light emitting section 22 may be positioned.
- a glass epoxy wiring board or a lead frame may be used instead of the film wiring board 31.
- a point light source may be formed by collecting a plurality of LED chips at one location.
- the light emitting section 22 may be formed by insert molding the LED chip directly into the light guide plate 23, and is arranged outside the light guide plate 23 (at a position facing the outer peripheral surface of the light guide plate 23).
- FIG. 14 is an enlarged view showing an arrangement of a plurality or a large number of deflection patterns 34 formed in the surface light-emitting region 25 on the back surface of the light guide plate 23.
- the deflection pattern 34 is actually formed by recessing the back surface of the light emitting section 22 into a triangular groove shape or a semicircular groove shape as shown in FIG. (See Figure 32).
- the respective deflection patterns 34 are arranged so that the length direction is orthogonal to the direction connecting the position and the light emitting section 22, and the respective deflection patterns 34 are arranged concentrically. Further, as schematically shown in FIG.
- each deflection pattern 34 has a short dimension in the length direction near the light emitting section 22 and a long dimension in a direction farther from the light emitting section 22.
- the arrangement number (density) per unit area in the surface emitting region 25 is constant everywhere.
- the light 40 emitted from the light emitting unit 22 is transmitted from the light incident surface of the light guide plate 23 to the inside of the light guide plate 23. And propagates in the light guide plate 23 while repeating reflection between the front surface and the back surface of the light guide plate 23. During this propagation, as shown in FIG.
- the light 40 incident on the reflecting surface 34A is directed toward the surface (light emitting surface) of the light guide plate 23.
- the light is totally reflected and emitted from the light exit surface of the light guide plate 23 in a direction substantially perpendicular to the light exit surface.
- the light 40 that is totally reflected on the surface of the light guide plate 23 after returning to the light guide plate 23 after being totally reflected on the reflection surface 34A is reflected on the deflection pattern 34 when the directional force perpendicular to the surface of the light guide plate 23 is also viewed. It travels in the same direction as the light 40 before it enters.
- the light guide direction is oriented in a fixed direction for each point, and the light emitted from the light emitting section 22 Goes radially in the light guide plate 23.
- a prism sheet is disposed so as to face the surface of the light guide plate, and light is emitted from the surface of the light guide plate in a direction substantially parallel to the surface. Is deflected in a vertical direction by a prism sheet.
- FIG. 17 shows an arrangement in which the deflection patterns 34 are arranged in a lattice shape
- FIG. 18 shows an arrangement in which the deflection patterns 34 are arranged in a rhombic shape.
- FIG. 17 shows an arrangement in which the deflection patterns 34 are arranged in a lattice shape
- FIG. 18 shows an arrangement in which the deflection patterns 34 are arranged in a rhombic shape.
- the vector that determines the arrangement of the deflection pattern 16 is only in the circumferential direction. In the concentric arrangement as shown in FIG. Since the vector that defines the deflection pattern exists only in the radial direction, the arrangement of the deflection patterns 16 cannot be uniformed as a whole.
- FIG. 19 shows a basic pattern for determining an arrangement point of the deflection pattern 34 in the present invention.
- the direction and the cycle between the arrangement points are gradually changed as the distance from the center point (the position of the light emitting unit 22) increases, so that the arrangement point has two directions and the cycle.
- Such a direction and a period are continuous as the center point force is further away. It is changing gradually and gradually. As a result, except for the vicinity of the center point, placement with less deviation is possible.
- the number of arranging points of the deflection pattern 34 is 20 or more.
- the arrangement point 41 of the deflection pattern 34 has two directions connecting specific arrangement points, and a period (distance between the arrangement points) in each direction. These two directions and periods change gradually as the distance from the center point increases.
- the direction between the arrangement points can be represented as the direction of a vector Q; j8 connecting the two arrangement points as shown in FIG. 19, and the period in each direction is defined as the length of the vector Q; ⁇ . Can be represented.
- a plurality of right-handed spirals 35 and a plurality of left-handed spirals 36 are obtained as shown in FIG.
- the plurality of spirals 35 obtained in this way are rotationally symmetric with respect to the center point, and each spiral 35 has the same curve.
- the plurality of spirals 36 are rotationally symmetric with respect to the center point, and each spiral 36 has the same curve.
- the spirals 35 and 36 are asymmetric with respect to a line segment ⁇ ⁇ connecting the intersection and the center point (in other words, the two vectors a; Asymmetric about the distribution).
- the number ⁇ of the right-handed spiral 35 and the left-handed spiral 36 can both be expressed by the following equation (1).
- the value of the index ⁇ in the formula (1) is different between the spiral 35 and the spiral 36, and as a result, the number is different.
- n is a positive integer
- the helix 35 and the helix 36 are symmetric with respect to the line E passing through the intersection.
- the arrangement interval in the circumferential direction ⁇ increases as the distance between the center point forces increases, but the arrangement interval in the radial direction R is constant everywhere.
- the spacing in the circumferential direction ⁇ ⁇ ⁇ becomes far greater than the spacing in the radial direction R as the distance from the center point increases, and the radial direction R It will be densely arranged. In other words, it is dense in a certain direction and coarse in a certain direction. Therefore, in order to obtain an arrangement with less deviation as shown in FIG. 19, the number of the spirals 35 and the spirals 36 must be determined so as to be different.
- ⁇ g is represented by the following equation (5).
- the parameter Cm in equation (6) is a constant value (constant), and the distance between the arrangement points increases as the distance from the center point where the density is large at the center increases.
- the parameter Cm may be changed according to the distance from the center point in order to make the density of the arrangement points 41 uniform. That is, the parameter Cm may be determined to decrease as the distance Rm from the center point increases. More specifically, if the parameter Cm is determined as in the following equation (7), the distribution of the arrangement points 41 is as shown in FIG. 23, and the density of the arrangement points 41 (the number of arrangement points per unit area) is It is constant at any point.
- the deflection pattern 34 of the light guide plate 23 shown in FIG. 14 has such an arrangement pattern, It has a uniform arrangement pattern throughout.
- FIG. 25 is a diagram for explaining how to determine the connection line 42.
- a line segment is drawn from an appropriately selected starting point (arrangement point) P1 to an arbitrary nearby point (arrangement point) P2.
- the distance between the points P1 and P2 is L
- a circle 43 with a radius of 2L centered on the point P2 is assumed, and among the points existing in the circle 43, the line segment (P1P2) is the most The point at a short distance is P3.
- connection line 42 of the arrangement points Pl, P2, P3, ... is a right-handed spiral 35 or a left-handed spiral 36!
- FIG. 26 is an enlarged view showing a part of the arrangement of the conventional deflection pattern 16
- FIG. 27 is an enlarged view showing a part of the arrangement of the deflection pattern 34 according to the embodiment of the present invention.
- FIG. 28 shows the light intensity contrast on the backlight using the conventional deflection pattern as shown in FIG. 26 and the light intensity on the backlight using the deflection pattern of the present embodiment as shown in FIG.
- the horizontal axis indicates the position along the one axis direction on the knock light, and the vertical axis indicates the relative intensity of light.
- the contrast is as high as 45% in the conventional pattern arrangement, and there are strong and weak periods every 140 m.
- the contrast cycle in the conventional pattern arrangement has a cycle larger than the pixel cycle.
- the screen is glaring, which causes deterioration in image quality.
- the pattern arrangement of the present embodiment in which the deflection patterns 34 are evenly arranged, the contrast is reduced to about 5%. For this reason, with the pattern arrangement of this embodiment, it is possible to reduce screen glare and prevent deterioration of image quality on the liquid crystal display panel.
- the arrangement pattern of the deflection pattern 34 in the present invention is configured based on the arrangement pattern as shown in FIG. 23.
- the basic pattern as a whole is used as it is.
- the light emitting unit 22 is arranged at a position corresponding to the center point of the basic pattern, using only the area of about 1Z4, that is, the area surrounded by the dashed line 44 in FIG.
- the deflection pattern 34 is provided entirely within the dashed line 44 in FIG.
- the ratio of the number Na of the right-handed spirals 35 to the number Nb of the left-handed spirals 36 in the entire basic pattern or in a partial area thereof is included in the basic pattern.
- FIG. 30 is a schematic plan view showing a surface light source device according to Embodiment 2 of the present invention.
- the light emitting section 22 is disposed so as to face the center of one side of the light guide plate 23.
- a deflection pattern 34 is formed on the back surface of the light guide plate 23.
- the deflection pattern 34 is partially formed and not shown, but is formed over the entire surface light emitting region on the lower surface of the light guide plate 23.
- the pattern where the deflection patterns 34 are arranged in the surface light source device is a region of approximately 1Z2 of the uniform basic pattern as shown in FIG. 23, and the light emitting unit 22 is arranged at the center point of the basic pattern. are doing.
- FIG. 31 is a sectional view of a surface light source device 51 according to Embodiment 3 of the present invention
- FIG. 32 is a rear view of the light guide plate 23.
- This surface light source device is used as an illumination light such as a light for indoor lighting or a light for photography, and has a uniform light guide plate 23 as shown in FIG. A pattern is formed, and a conical light source concave portion 52 is formed at the center of the pattern.
- the light source concave portion 52 accommodates the light emitting portion 22 having a power such as an LED.
- a reflection sheet 24 is disposed on the entire back surface of the light guide plate 23.
- the deflection pattern 34 can be uniformly arranged on the circular light guide plate 23 without any gap, and uniform light emission can be achieved.
- Such a surface light source device is described in Example 4.
- FIG. 33 is a front view of a surface light source device 53 according to Embodiment 4 of the present invention.
- a plurality of or a large number of light emitting portions 55 such as LEDs are arranged on a surface of a printed wiring board 54 having a disk shape.
- the light emitting section 55 is arranged at a uniform basic pattern arrangement point as shown in FIG. That is, if the center of the polar coordinate is set at the center of the printed wiring board 54, the m-th light emitting portion 55 is
- Ro and ⁇ 0 may be any values.
- the number of the light emitting units 55 per unit area can be made constant, and the light emitting units 55 can be arranged without bias.
- the strength can be made uniform and it looks visually beautiful.
- the deflection pattern 34 is not used, the structure can be simplified, which is suitable for a case where a light emitting unit 55 (LED) having a fixed size is provided, or an application requiring a large amount of light.
- This surface light source device is also used as an illumination light such as a light for indoor lighting or a light for photography.
- FIG. 34 is a perspective view showing a surface light source device 56 according to Embodiment 5 of the present invention.
- the surface light source device 56 is a three-dimensional light-emitting body, and a plurality of light-emitting portions (LEDs) are arranged on the surface of a three-dimensional shape 57 that is rotationally symmetric about the rotation axis z. It was made.
- the Z axis is set in the direction of the rotation center axis of the three-dimensional shape 57, and the distance in the radial direction of the Z axis force is R. Also, the contour of the three-dimensional shape 57 is
- the m-th light emitting portion is arranged at a position (Rm, ⁇ m, Zm) defined by the following equation.
- ⁇ m ⁇ m-l + ⁇ g
- a plurality of light emitting units can be uniformly arranged on the surface of the rotating body.
- FIG. 35 is a schematic sectional view of a liquid crystal display device 71 according to the present invention.
- This liquid crystal display In the case of 71, the surface light source device 73 of the present invention is arranged on the back of the liquid crystal display panel 72.
- the liquid crystal display panel 72 has a liquid crystal layer 76 interposed between a back substrate 74 on which switching elements such as TFTs (thin film transistors) and wiring are formed, and a front substrate 75 on which transparent electrodes and color filters are formed. It is sealed, and a polarizing plate 77 is overlapped on both front and back surfaces.
- the surface light source device 73 is turned on to illuminate the liquid crystal display panel 72 with the rear side force, and each pixel of the liquid crystal display panel 72 is turned on and off to generate an image. I do.
- the surface light source device of the present invention can be applied to a front light, and is not shown, but can also be used for a reflection type liquid crystal display device.
- FIG. 36 shows a mobile phone 81 incorporating the liquid crystal display device 71 according to the present invention.
- a liquid crystal display device 71 is incorporated as a display on a dial section 82 having a numeric keypad and the like, and an antenna 83 is provided on the upper surface.
- FIG. 37 shows a portable information terminal 84 such as a PDA in which a liquid crystal display device 71 according to the present invention is incorporated as a display.
- the portable information terminal 84 is provided with an input unit 85 for performing pen input or the like beside the liquid crystal display device 71, and a lid 86 is pivotally mounted on an upper end portion.
- the surface light source device emits light uniformly, preventing the screen from being glare and improving the image quality. Can be improved.
- FIG. 38 shows a display device (illuminated signboard) 87 using the surface light source device 53 of the fourth embodiment.
- the surface light source device 53 of the fourth embodiment since the light-emitting portions having different emission colors can be arranged, the light-emitting portions having different emission colors are arranged so as to have an arbitrary pattern, a picture, or the like. By electronically controlling the light emission timing, it can be used as an illuminated signboard. According to such a display device 87, a color display having a uniform display surface can be manufactured without using a liquid crystal display panel.
- FIG. 39 shows, for example, an electric traffic light 88 that uses the surface light source device of the third or fourth embodiment as red, green, and blue signal lights 89. That is, each of the light emitting units emits red light.
- a light emitting portion a light emitting portion for emitting green light, and a light emitting portion for emitting blue light, it can be used for the signal lamp 89.
- the surface light source device of the present invention can be used as a backlight or front light of a liquid crystal display panel or the like, or as an illumination lamp.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Planar Illumination Modules (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2004800345001A CN1882802B (zh) | 2003-11-20 | 2004-11-12 | 面光源装置和使用该装置的设备 |
EP04818876A EP1688661A4 (en) | 2003-11-20 | 2004-11-12 | SURFACE LIGHT SOURCE UNIT AND DEVICE USING SUCH A UNIT |
US11/436,163 US20060203317A1 (en) | 2003-11-20 | 2006-05-17 | Surface light source equipment and apparatus using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-391497 | 2003-11-20 | ||
JP2003391497A JP4507062B2 (ja) | 2003-11-20 | 2003-11-20 | 面光源装置及び当該装置を用いた機器 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/436,163 Continuation US20060203317A1 (en) | 2003-11-20 | 2006-05-17 | Surface light source equipment and apparatus using the same |
Publications (1)
Publication Number | Publication Date |
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WO2005050085A1 true WO2005050085A1 (ja) | 2005-06-02 |
Family
ID=34616412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016873 WO2005050085A1 (ja) | 2003-11-20 | 2004-11-12 | 面光源装置及び当該装置を用いた機器 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060203317A1 (ja) |
EP (1) | EP1688661A4 (ja) |
JP (1) | JP4507062B2 (ja) |
KR (1) | KR100801804B1 (ja) |
CN (1) | CN1882802B (ja) |
WO (1) | WO2005050085A1 (ja) |
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CN100426094C (zh) * | 2005-08-01 | 2008-10-15 | 欧姆龙株式会社 | 面光源装置 |
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JP5796312B2 (ja) * | 2011-03-15 | 2015-10-21 | オムロン株式会社 | 面光源装置 |
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JP6107553B2 (ja) * | 2013-09-06 | 2017-04-05 | 豊田合成株式会社 | Led発光装置 |
US9689715B2 (en) * | 2015-05-19 | 2017-06-27 | Mitutoyo Corporation | Light source array used in an illumination portion of an optical encoder |
JP6778916B2 (ja) * | 2016-11-17 | 2020-11-04 | パナソニックIpマネジメント株式会社 | 表示装置 |
CN106940460B (zh) * | 2017-05-11 | 2020-03-17 | 深圳Tcl新技术有限公司 | 导光板、背光模组及显示装置 |
USD911352S1 (en) * | 2017-10-10 | 2021-02-23 | Siteimprove A/S | Display screen with graphical user interface for presenting website analytics |
JP7268122B2 (ja) * | 2018-03-12 | 2023-05-02 | 株式会社バンダイ | 発光玩具 |
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- 2004-11-12 EP EP04818876A patent/EP1688661A4/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
EP1688661A1 (en) | 2006-08-09 |
KR100801804B1 (ko) | 2008-02-11 |
JP4507062B2 (ja) | 2010-07-21 |
US20060203317A1 (en) | 2006-09-14 |
CN1882802B (zh) | 2010-04-21 |
CN1882802A (zh) | 2006-12-20 |
JP2005158310A (ja) | 2005-06-16 |
EP1688661A4 (en) | 2008-07-30 |
KR20060060745A (ko) | 2006-06-05 |
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