WO2013168392A1 - 導光板 - Google Patents
導光板 Download PDFInfo
- Publication number
- WO2013168392A1 WO2013168392A1 PCT/JP2013/002837 JP2013002837W WO2013168392A1 WO 2013168392 A1 WO2013168392 A1 WO 2013168392A1 JP 2013002837 W JP2013002837 W JP 2013002837W WO 2013168392 A1 WO2013168392 A1 WO 2013168392A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- guide plate
- light guide
- light
- prism
- depth
- Prior art date
Links
Images
Classifications
-
- 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
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- 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
- G02B6/0045—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 by shaping at least a portion of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
-
- 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
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging 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
- G02B6/0035—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
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
Definitions
- the present invention relates to a light guide plate used in a lighting device.
- FIG. 12 is a perspective view of a conventional light guide plate. As shown in FIG. 12, the conventional light guide plate includes an LED light source 13 and a light guide plate 11.
- the light guide plate 11 has a reflecting prism surface 22 having a plurality of prisms 12 and a light emitting surface 23 opposite to the reflecting prism surface 22.
- the light guide plate 11 reflects the light by the prism 12 while propagating the incident light therein, and emits the light from the light emitting surface 23.
- LED light sources 13 are disposed at both ends of the light guide plate 11.
- the LED light source 13 is light generating means for generating light emitted to the light guide plate 11.
- the depth of the prism 12 is increased as the distance from the LED light source 13 increases. This is because the prism 12 is configured so that the direct light from the LED light source 13 and the reflected light reflected by the light emitting surface 23 can be uniformly reflected by the entire light guide plate 11 regardless of the location. Is formed. In other words, the larger the prism is, the more difficult it is to reach as it goes deeper.
- FIG. 12 schematically shows that the number of prisms 12 is small. This is the same in the following figures.
- the light guide plate 11 actually has 169 triangular prisms 12 on the reflecting prism surface 22.
- the length W of the light guide plate 11 is 59.2 mm, and the thickness D of the light guide plate 11 is 3.5 mm.
- the pitch between the prisms 12 is constant at 0.35 mm.
- the depth of the prism 12 (the height of the triangle) is 24.3 ⁇ m at the first end of the prism 12 at the end, and 75 ⁇ m at the 85th position in the center.
- the depth of the prism 12 is varied, and the guided light is reflected to the light exit surface 23 side.
- the thickness D of the light guide plate 11 is 3.5 mm.
- the maximum depth of the prism 12 is set to 75 ⁇ m (a thickness of several percent).
- the thickness of the light guide plate 11 cannot be less than a certain ratio with respect to the height of the prism 12, and the possible thickness is limited by the height of the prism 12. For this reason, if an attempt is made to design a thin sheet-like light guide plate 11 having a thickness of 0.2 to 0.3 mm, it is impossible to secure a thickness for guiding necessary light.
- a light guide plate including a side surface on which light is incident, a bottom surface having a plurality of grooves from which light is reflected, and an upper surface from which light is emitted, the bottom surface being a pitch of the grooves.
- a light guide plate having a first region in which the depth of the groove changes and a second region in which the depth of the groove changes is used.
- the V-shaped prism since the substantially V-shaped prism has a region in which the pitch of the prism is variable and a region in which the height of the prism is variable, the V-shaped prism does not become too deep and is guided.
- the depth of the V-shaped prism can be set according to the sheet thickness of the optical plate.
- a light guide plate capable of making the light emitting surface uniform can be realized within a pitch range of an area that cannot be visually recognized by human eyes.
- FIG. 1A is a perspective view of the light guide plate of Embodiment 1.
- FIG. 1B is a partial cross-sectional view of an end portion of the light guide plate of Embodiment 1.
- FIG. 1C is a partial cross-sectional view of an end portion of a light guide plate according to a modification of the first embodiment.
- 2A is a diagram showing a pitch distribution of grooves of the light guide plate of Embodiment 1.
- FIG. 2B is a diagram illustrating a depth distribution of grooves of the light guide plate of Embodiment 1.
- FIG. 3 is a perspective view of the light guide plate of the second embodiment.
- FIG. 4 is a partial cross-sectional view of the light guide plate of the second embodiment.
- FIG. 5 is a perspective view of the light guide plate of the third embodiment.
- FIG. 6 is a partial cross-sectional view of the light guide plate of the third embodiment.
- FIG. 7 is a perspective view of the light guide plate of the fourth embodiment.
- FIG. 8 is a partial cross-sectional view of the light guide plate of the fourth embodiment.
- FIG. 9 is a perspective view of the light guide plate of the fifth embodiment.
- FIG. 10 is a partial cross-sectional view of the light guide plate of the fifth embodiment.
- FIG. 11 is a perspective view of the light guide plate of the sixth embodiment.
- FIG. 12 is a perspective view of a conventional light guide plate.
- FIG. 1A is a perspective view showing an illumination optical system in a lighting fixture using a light guide plate 11 according to one embodiment of the present invention.
- the illumination optical system in FIG. 1A includes an LED light source 13 and a light guide plate 11.
- a plurality of LED light sources 13 are arranged in a straight line at substantially constant intervals on the two opposing surfaces of the light guide plate 11.
- FIG. 1B is an enlarged cross-sectional view of the end of the AB portion of the light guide plate 11 of FIG. 1A.
- a plurality of prisms 12 that are grooves are formed.
- the prism depth T represents the depth of the prism 12.
- the thickness D represents the thickness of the portion of the light guide plate 11 where the prism 12 is not formed.
- the first area PA is an area where the depth T of the prism 12 is constant and the pitch P of the prism 12 is variable.
- the second area TA is an area where the pitch P is constant and the depth T of the prism 12 is variable. From the LED light source 13 side, the first area PA with variable pitch and the second area TA with variable depth are arranged adjacent to each other. A region where the prism 12 does not exist may be provided between the side end portion of the light guide plate 11 on the LED light source 13 side and the first region PA whose pitch is variable.
- the amount of change ⁇ t indicates the amount of change in the depth of the prism 12 between the first area PA and the second area TA.
- the pitch P5 to the pitch P1 indicate that the pitch is variable.
- the depth T (x) indicates that the depth of the prism 12 changes according to the distance x.
- the light guide plate 11 is formed of one acrylic resin layer. On the light guide plate 11, a linear array of LED light sources 13 and a substantially V-shaped prism 12 extend in the same direction.
- the length W of the light guide plate 11 is 470 mm, the width H is 270 mm, the thickness D is 0.3 mm, and the minimum depth T of the prism 12 on the light source side of the LED light source 13 is as small as 0.7 ⁇ m. is there.
- the maximum pitch P of the prisms 12 is formed up to 800 ⁇ m.
- the pitch P5 is the maximum pitch.
- the pitch P is all 800 ⁇ m or less. This is to prevent visual unevenness. When it is close to 1 mm, the pattern is recognized visually. If it is at least 800 ⁇ m or less, the problem of unevenness does not occur.
- the first area PA is written in several levels from FIG. 1B from the pitch P5 to the pitch P1, but in actuality, the pitch P is varied by the variable pitch P up to about 200. Since the pitch P is away from the LED light source 13, the pitch P is decreased so as to increase the area reflected in the emission surface direction (upper surface). This is because the light intensity decreases as the distance from the LED light source 13 decreases, so that a small amount of light away from the LED light source 13 is reflected in the exit surface direction.
- the minimum pitch P1 in the embodiment is 130 ⁇ m. At this time, it is possible to make the minimum pitch P finer, but the number of prisms 12 which are reflection surfaces increases, and it takes a long time to form a pattern at the time of manufacture, which is not economical in efficiency. Further, when the area is increased, the minimum pitch P cannot be made smaller than the width of the prism 12, so it is finite and there is a limit that can be configured in size.
- the depth of the prism 12 is constant. The reason for this is to secure the light guided to the second variable depth region TA located next.
- the pitch P is constant, and the depth T of the prism 12 is changed deeply. That is, the variable second area TA is changed.
- the maximum depth T is 6 ⁇ m.
- FIG. 2A shows a change in the pitch of the prism 12 in the length W direction in the light guide plate 11.
- FIG. 2B shows a change in the depth of the prism 12 in the length W direction in the light guide plate 11. Both are near the center of the light guide plate 11.
- the horizontal axis is the length direction (W direction) of the light guide plate 11 and the distance x, and the center of the light guide plate 11 is 0 mm.
- the first area PA is located on both ends of the light guide plate 11 and on the LED light source 13 side, and the second area TA is located therebetween.
- the first variable area PA with variable pitch is a curve function fp (x) in which the pitch P (x) changes smoothly with the distance x from the LED light source 13 side. It is a linear function or a function that increases and decreases monotonically close to a linear function.
- the second region TA with variable depth is an ft (x) curve function in which the depth T (x) changes smoothly with the distance x from the light source. It is a function like a parabola or a hyperbola that takes a maximum value at the center of the light guide plate 11 and decreases toward the end.
- a brightness difference in brightness occurs due to a sudden change in the depth T. Therefore, a difference in brightness tends to occur where the depth of the prism 12 changes between the first area PA and the second area TA.
- the amount of change ⁇ t in the depth of the prism 12 in the region where both regions are switched needs to be less than 0.6 ⁇ m.
- the unevenness is a bright line appearing between the first area PA and the second area TA.
- discontinuity tends to be detected particularly in a portion where continuity is interrupted. Therefore, it is necessary to limit the amount of change ⁇ t as described above.
- the maximum groove depth of the second region TA with variable depth is 6 ⁇ m.
- This maximum depth is a sheet with a thickness D of the light guide plate 11 as thin as 0.3 mm. Therefore, if the depth of the prism 12 is deep, the strength is significantly reduced. Further, a light guide range for guiding light far away is also required optically, and it is desirable not to form the prism 12 at least up to 95% of the thickness D of the light guide plate 11.
- the depth MAX of the prism 12 is 2% of 6 ⁇ m with respect to 0.3 mm of the thickness D of the light guide plate 11. Further, in the manufacturing process, if there is an imbalance of the release force in the release process after the transfer to a thin sheet in the transfer system using a hot press or the like, deformation occurs. In order to bring the three factors of optical factor, strength factor and manufacturing process factor into the manufacturable region, the thickness D of the light guide plate 11 and the maximum depth Tmax of the depth T of the prism 12 The relationship is preferably the following equation (1).
- the first area PA and the second area TA are different areas, but as shown in FIG. 1C, the depth of the prism 12 is varied while the pitch is variable between the two areas. There may be a region (PA + TA) for changing.
- FIG. 1C corresponds to FIG. 1B and shows another example.
- the LED light sources 13 are provided on both sides of the light guide plate 11, but may be provided on one side.
- the prism 12 can be designed with a depth of 10 ⁇ m or less, and a pattern design equivalent to 50 inches (1050 mm ⁇ 650 mm) can be achieved at a thickness of 0.3 mm.
- the design limit is equivalent to 10 inches (210 mm ⁇ 140 mm).
- a pattern configuration with a large area approximately 23 times that is possible.
- a thin and large-area light guide plate can be realized.
- the shape of the prism 12 in the direction in which the LEDs 13 are arranged is constant and does not change. This is to make the light of the LED 13 uniform in the direction perpendicular to the arrangement of the LEDs 13.
- the cross-sectional shape of the prism 12 is a triangle, it is preferable that the prisms 12 have similar shapes. Light reflection is uniform. Further, the design can be simplified and the manufacture is easy.
- FIG. 3 is a diagram showing the light guide plate 11 according to the second embodiment. It consists of an LED light source 13 and a light guide plate 11. A plurality of LED light sources 13 are arranged on only one side of the light guide plate 11. Other matters not described below are the same as those in the first embodiment.
- FIG. 4 is an enlarged view of a cross section taken along the AB plane of the light guide plate 11 of FIG. It consists of a prism 12, an acrylic sheet layer 16, and a UV resin layer 17.
- the prism 12 is the same as that in the first embodiment (FIGS. 2A and 2B). However, since the LED light source 13 is on one side, the prism pattern is only on the left side of FIGS. 2A and 2B. That is, each of the first area PA and the second area TA is only one pattern.
- the light guide plate 11 has an acrylic sheet layer 16 and a UV resin layer 17 in close contact with each other, and a triangular micro-concave groove prism 12 is formed on the UV resin layer 17.
- V-shaped micro uneven groove-shaped prism 12 on a thin sheet using a transfer process using UV resin.
- a mold is formed in which a convex optical surface triangular shape for forming a minute concave and convex groove shape is formed with a concave and convex pattern opposite to the shape of a light guide plate to be transferred in accordance with variable pitch and variable depth. .
- UV resin After releasing the mold, apply UV resin and place a transparent acrylic sheet on top of the mold while touching it from the end so that no air bubbles are introduced. After this step, ultraviolet rays are irradiated from the transparent acrylic sheet side to cure the UV resin. After curing, the acrylic sheet and the UV resin layer are peeled off from the mold surface in an integrated state. By this transfer process, the pattern layer of the prism 12 of the UV resin layer 17 is formed on the acrylic sheet layer 16. In another embodiment, when using a UV resin layer, the same manufacturing method can be used.
- FIG. 5 is a perspective view of the light guide plate 11 according to Embodiment 3 of the present invention.
- the prism 12 includes a first UV resin layer 17A, a second UV resin layer 17B, and an acrylic sheet layer 16.
- the prism 12 is formed on the second UV resin layer 17B.
- the shape of the prism 12 is the same as that of the second embodiment. Matters not described below are the same as those in the first embodiment.
- the acrylic sheet layer 16 has a light guide thickness that guides light in the lateral direction (parallel to the sheet surface).
- the front and back surfaces of the acrylic sheet layer 16 are mirror surfaces, and light is guided and spread while totally reflecting inside the acrylic sheet resin layer.
- a minute mountain pattern 24 is formed in a direction orthogonal to the prism shape of the second UV resin layer 17B. ing.
- the small chevron pattern 24 is a convex pattern with a radius of 50 ⁇ m and a pitch of 100 ⁇ m formed on a semicircular cylinder. Similar to Embodiment 2, it can be manufactured using a transfer process using UV resin.
- Embodiment 4 A light guide plate 11 according to Embodiment 4 of the present invention will be described with reference to FIGS.
- FIG. 6 is a diagram showing an illumination optical system using the light guide plate 11 of the fourth embodiment.
- the illumination optical system in FIG. 6 includes an LED light source 13 and a light guide plate 11.
- the inclined portion 21 is a portion that changes so as to increase the thickness of the light guide plate 11 in a direction approaching the LED light source 13 of the light guide plate 11.
- a plurality of LED light sources 13 are arranged in a straight line at substantially regular intervals, and a plurality of LED light sources 13 are arranged facing each other so that light from the LED light sources 13 enters from two sides of the light guide plate 11.
- FIG. 7 is a partial cross-sectional view of the light source plate 11 in the vicinity of the LED light source 13 taken along the line AB.
- the light guide plate 11 is formed of one layer of acrylic resin.
- a linear array of LED light sources 13 and a prism 12 having a substantially V-shaped minute concave and convex groove extend in the same direction.
- the cross-sectional shapes of the V-shaped minute irregularities are arranged.
- the V-shaped micro-concave prism 12 formed of one acrylic sheet layer is directly formed on the acrylic resin layer by a thermal transfer process or the like.
- the light guide plate 11 has an inclined portion 21 which is a portion that changes so as to increase the thickness of the light guide plate 11 in a direction approaching the LED light source 13.
- the inclined portion 21 is formed so that the thickness of the light guide plate 11 is not less than the height h of the LED light source 13 with respect to the height h of the LED light source 13. Thereby, the light from the LED light source 13 can be efficiently incident on the thin light guide plate 11.
- the prism 12 having a fine triangular groove is formed in the region where the thickness of the light guide plate 11 is constant.
- the inclination length (left and right direction, W direction) of the inclined portion 21 is twice to three times the height h of the LED light source 13. If it is shorter than twice, the rate of light leakage increases. If it is longer than three times, the commercial value of the light guide plate that is thin is lowered.
- the inclined portion 21 is not a curved line (spherical surface) but a straight line (plane). It is preferable to reflect the incident light in a straight line (plane) so that the incident light is uniformly guided into the light guide plate 11.
- the light incident efficiency of light from the light source is 40 to 50%, but the height of the inclined portion 21 is 0.8 mm. By doing so, the light incident efficiency of light from the light source is improved to 85 to 90%.
- FIG. 8 is a perspective view showing an illumination optical system using the light guide plate 11 of the fourth embodiment.
- the difference from the fourth embodiment is that the inclined portion 21 is changed to increase the thickness of the light guide plate 11 in the direction of the surface on which the prism 12 is formed as the light source of the light guide plate 11 is approached. is there. Other conditions are the same as those in the fourth embodiment.
- the shape of the inclined portion 21 is the same as that in the fourth embodiment.
- FIG. 9 is a partial cross-sectional view of the light source plate 11 in the vicinity of the LED light source 13 taken along the line AB. It is a figure corresponding to FIG. The effect is the same as that of the fourth embodiment. Further, when the light guide plate 11 is viewed from the surface, the light guide plate 11 is flat, and a member such as a television is easily placed on the surface.
- FIG. 10 is a partial cross-sectional view of the vicinity of the LED light source 13 of the illumination optical system using the light guide plate 11 of one embodiment of the present invention.
- the illumination optical system in FIG. 10 includes an LED light source 13 and a light guide plate 11.
- the light guide plate 11 includes an acrylic sheet layer 16 and a UV resin layer 17 on which a prism 12 having a V-shaped groove is formed.
- the inclined portion 21 is a portion that changes so as to increase the thickness of the light guide plate 11 in the direction of approaching the LED light source 13 of the UV resin layer 17.
- the shape of the prism 12 is the same as in the first and second embodiments.
- the inclined portion 21 has a shape that becomes thicker as it approaches the LED light source 13 side so that the end portion thereof is equal to or higher than the height h of the LED light source 13. Thereby, the light from the LED light source 13 can be efficiently incident on the thin light guide plate 11. Further, since the inclined portion 21 is formed only on the same surface as the prism 12 of the V-shaped groove, the height of the light incident portion is increased by the UV resin layer 17 on the surface of the flat acrylic sheet layer 16. Therefore, it is not necessary to produce an acrylic sheet having a special shape. As a result, it is possible to increase the light incident efficiency of light from the light source. By forming with UV light, the inclined portion 21 and the prism 12 can be accurately formed. The shape of the inclined portion 21 is the same as that in the fourth embodiment.
- FIG. 11 is a perspective view of an illumination optical system using the light guide plate 11 of the seventh embodiment.
- This is a modification of the third embodiment (FIG. 5).
- the difference is that the second UV resin layer 17B of the light guide plate 11 has an inclined portion 21 which is a portion that changes so as to increase the light guide thickness in the direction approaching the light source.
- the sum of the height of the acrylic sheet layer 16, the second UV resin layer 17B, and the first UV resin layer 17A with respect to the height h of the LED light source 13 is greater than or equal to the height h of the LED light source 13 by the inclined portion 21.
- the inclined portion 21 that increases in thickness as the light guide plate 11 approaches the light source side is formed only on the surface side on which the prism 12 is formed.
- the light from the LED light source 13 can be efficiently incident on the light guide plate 11. Further, since it is formed on the same surface as the prism 12, it can be formed on the surface of the flat acrylic sheet layer 16 with a UV resin layer so as to increase the height of the light incident portion. Without using 16, it is possible to increase the light incident efficiency of the light from the light source. Other conditions are the same as those in the first embodiment.
- the length of the light guide plate 11 in the length direction (left-right direction) of the inclined portion 21 is about 2 to 3 times the height h. Below 2 times, the rate of light leakage is large.
- the shape of the inclined portion 21 is the same as that in the fourth embodiment.
- the thin light guide plate 11 has the fine prism shape in which the depth of the fine V-shaped groove is limited to 5% or less of the light guide thickness, the pitch variable region, the groove depth variable region, By combining the variables, it is possible to form a thinner light-emitting pattern on the surface of the light guide plate 11 having a large area.
- an ultra-thin liquid crystal It can also be used as a backlight for TV.
- the change amount of the prism 12 is small and shallow, transfer in a thin layer is possible even in a manufacturing process using UV resin and a process using thermal transfer, and a thinner light guide plate 11 is possible. Become.
- the light guide plate 11 of the present invention makes it possible to realize all kinds of lighting fixtures and video backlights that are ultra-thin, light-weight, and bend, and can be reduced in weight and new designs.
- Embodiments 1 to 8 can be combined in a timely manner.
- It can be used for various lighting devices and video backlights.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
本発明の実施の形態1における導光板11について、図1A、図1Bを用いて説明する。図1Aは、本発明の1実施例の導光板11を用いた照明器具内の照明光学系を示す斜視図である。図1Aの照明光学系は、LED光源13と導光板11からなる。LED光源13は、導光板11の対向する2面の側に、それぞれ、ほぼ一定間隔で直線状に、複数個配置されている。
ここで、導光板11が一定厚みでない場合は、導光板11で光が導光するもっとも薄い部分で、式(1)の関係を満たす必要がある。
本発明の実施の形態2における導光板11について、図3、4を用いて説明する。
図5は、本発明の実施の形態3の導光板11の斜視図である。プリズム12、第1UV樹脂層17A、第2UV樹脂層17B、アクリルシート層16とからなる。第2UV樹脂層17Bに、プリズム12が形成されている。プリズム12の形状は、実施の形態2と同様である。以下で記載していない事項は、実施の形態1と同じである。
本発明の実施の形態4における導光板11について、図6、7を用いて説明する。
本発明の実施の形態4における導光板11の変形例について、図8、9を用いて説明する。図8は、実施の形態4の導光板11を用いた照明光学系を示す斜視図である。実施の形態4との違いは、傾斜部21を、導光板11の光源に近づくにしたがい、プリズム12の形成された面方向に、導光板11の厚みを厚くするように変化している部分である。その他の条件は実施の形態4と同じである。傾斜部21の形状は、実施の形態4と同様である。
本発明の実施の形態6における導光板11について、図10を用いて説明する。図10は、本発明の1実施例の導光板11を用いた照明光学系のLED光源13の付近の部分断面図である。図10の照明光学系は、LED光源13と導光板11からなる。導光板11は、アクリルシート層16と、V字形状溝のプリズム12が形成されているUV樹脂層17とからなる。傾斜部21は、UV樹脂層17のLED光源13に近づく方向に導光板11の厚みを厚くするように変化している部分である。プリズム12の形状は、実施の形態1、2と同じである。
実施の形態7における導光板11について、図11を用いて説明する。図11は、実施の形態7の導光板11を用いた照明光学系の斜視図である。実施の形態3(図5)の変形例である。違いは、導光板11の第2UV樹脂層17Bに、光源に近づく方向に導光厚を厚くするように変化している部分である傾斜部21をもつことである。
12 プリズム
13 LED光源
16 アクリルシート層
17 UV樹脂層
17A 第1UV樹脂層
17B 第2UV樹脂層
21 傾斜部
22 反射プリズム面
23 光出射面
24 微小山型パターン
PA 第1領域
TA 第2領域
Claims (11)
- 光が入射される側面と、
前記光が、反射される複数の溝を有する底面と、
前記光が放出される上面と、を含む導光板であり、
前記底面は、前記溝のピッチが変化する第1領域と、前記溝の深さが変化する第2領域とを有することを特徴とする導光板。 - 前記光が入射される側に、前記第1領域が配置され、前記第1領域に隣接し、前記導光板の内部側に前記第2領域が配置される請求項1記載の導光板。
- 前記光が入射される両側面に、前記第1領域が2つ配置され、前記2つの第1領域間の前記導光板の内部側に前記第2領域が1つ配置される請求項1記載の導光板。
- 前記溝のピッチが変化する第1領域では、前記溝の深さが一定であり、
前記溝の深さが変化する第2領域では、前記溝のピッチが一定である請求項1記載の導光板。 - 前記導光板のすべての前記溝のピッチは800μm以下であることを特徴とする請求項1から4のいずれか1項に記載の導光板。
- 前記導光板の厚みDと、前記溝の最大深さTmaxとの比率が下記式であることを特徴とする請求項1から4のいずれか1項に記載の導光板。
Tmax/D≦0.05 - 前記溝のピッチが変化する第1領域と、前記深さが変化する第2領域との間の溝深さの差ΔTが以下である請求項1から4のいずれか1項に記載の導光板。
ΔT<0.6μm - 前記導光板が、
前記底面側に位置する前記溝を有するUV樹脂層と、
前記上面側に位置するシート樹脂層と、からなることを特徴とする請求項1から4のいずれか1項に記載の導光板。 - 前記導光板が、
前記上面側に位置するプリズム形状を有する第1UV樹脂層と
前記底面側に位置する前記溝を有する第2UV樹脂層と、
前記第1UV樹脂層と前記第2UV樹脂層との間に位置するUV樹脂層でない樹脂層とからなることを特徴とする請求項1から4のいずれか1項に記載の導光板。 - 前記導光板の光が入射される側面の厚みが、前記側面に近づくにしたがい、増している請求項1~4のいずれか1項に記載の導光板。
- 前記導光板の前記底面側の厚みのみが増している請求項10に記載の導光板。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014514376A JP6074628B2 (ja) | 2012-05-10 | 2013-04-26 | 導光板 |
US14/394,487 US9229151B2 (en) | 2012-05-10 | 2013-04-26 | Light guide |
EP13788140.5A EP2848858B1 (en) | 2012-05-10 | 2013-04-26 | Light guide |
CN201380024463.5A CN104272011A (zh) | 2012-05-10 | 2013-04-26 | 导光板 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-108263 | 2012-05-10 | ||
JP2012108263 | 2012-05-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013168392A1 true WO2013168392A1 (ja) | 2013-11-14 |
Family
ID=49550460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/002837 WO2013168392A1 (ja) | 2012-05-10 | 2013-04-26 | 導光板 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9229151B2 (ja) |
EP (1) | EP2848858B1 (ja) |
JP (1) | JP6074628B2 (ja) |
CN (1) | CN104272011A (ja) |
WO (1) | WO2013168392A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017516283A (ja) * | 2014-05-16 | 2017-06-15 | コーニング インコーポレイテッド | 液晶表示装置用のエッジライト型バックライトユニット |
WO2022176348A1 (ja) * | 2021-02-17 | 2022-08-25 | パナソニックIpマネジメント株式会社 | 光学システム |
JP7434733B2 (ja) | 2019-06-20 | 2024-02-21 | 大日本印刷株式会社 | 調光部材、調光装置 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI481915B (zh) * | 2013-08-20 | 2015-04-21 | Radiant Opto Electronics Corp | 具多向性結構之導光板 |
CN104298003A (zh) * | 2014-10-21 | 2015-01-21 | 京东方科技集团股份有限公司 | 一种背光源及显示装置 |
KR102130133B1 (ko) * | 2015-10-16 | 2020-07-03 | 삼성전자주식회사 | 백 라이트 장치 및 이를 포함하는 3차원 영상 표시 장치 |
WO2017147066A1 (en) * | 2016-02-22 | 2017-08-31 | Lumileds Llc | Asymmetrical light intensity distribution from luminaire |
CN109212661B (zh) * | 2018-11-16 | 2021-07-13 | 武汉天马微电子有限公司 | 一种导光板和显示面板 |
CN111435186A (zh) * | 2019-01-15 | 2020-07-21 | 鸿富锦精密工业(深圳)有限公司 | 导光组件、背光模组以及显示设备 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004200128A (ja) | 2002-12-20 | 2004-07-15 | Koninkl Philips Electronics Nv | 補助光源及びそれを用いたフロントライト |
JP2005011599A (ja) * | 2003-06-17 | 2005-01-13 | Omron Corp | 面光源装置及び当該面光源装置を用いた機器 |
JP2005123049A (ja) * | 2003-10-17 | 2005-05-12 | Auto Network Gijutsu Kenkyusho:Kk | 導光板 |
JP2007225788A (ja) * | 2006-02-22 | 2007-09-06 | Citizen Electronics Co Ltd | 導光板及び該導光板を用いた表裏一体型バックライト及び該バックライトを用いた液晶表示装置。 |
JP2008052940A (ja) * | 2006-08-22 | 2008-03-06 | Citizen Electronics Co Ltd | 導光板及びその製造方法とその導光板を用いたバックライトユニット |
JP2009070643A (ja) * | 2007-09-12 | 2009-04-02 | Epson Imaging Devices Corp | 照明装置、液晶装置及び電子機器 |
JP2012059612A (ja) * | 2010-09-10 | 2012-03-22 | Dainippon Printing Co Ltd | 面発光装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10339815A (ja) * | 1997-06-09 | 1998-12-22 | Sanyo Electric Co Ltd | 導光板、導光板の製造方法及びその導光板を用いた面光源 |
JP2001215507A (ja) * | 2000-02-04 | 2001-08-10 | Sharp Corp | 導光板およびそれを用いた面状光源、並びにそれを用いたバックライト光学系およびディスプレイ |
JP2001307527A (ja) * | 2000-04-17 | 2001-11-02 | Sharp Corp | 面状発光装置及びこれを用いたバックライト光学系及びディスプレイ |
JP4142234B2 (ja) | 2000-07-04 | 2008-09-03 | 株式会社エンプラス | 面光源装置及び液晶表示装置 |
CN100354720C (zh) * | 2000-10-20 | 2007-12-12 | 三菱电机株式会社 | 液晶显示装置用背光 |
JP4130115B2 (ja) * | 2002-10-16 | 2008-08-06 | アルプス電気株式会社 | 照明装置、及び液晶表示装置 |
CN101089662A (zh) * | 2002-11-29 | 2007-12-19 | 富士通株式会社 | 导光板、照明设备和显示设备 |
JP4220479B2 (ja) * | 2004-09-02 | 2009-02-04 | 鴻富錦精密工業(深▲セン▼)有限公司 | 導光板及び背光モジュール |
JP4560653B2 (ja) * | 2007-09-21 | 2010-10-13 | ライツ・アドバンスト・テクノロジー株式会社 | 導光板およびバックライトユニット |
CN101782218B (zh) * | 2010-02-26 | 2012-09-05 | 上海向隆电子科技有限公司 | 导光板、背光模组以及光线传导方法 |
-
2013
- 2013-04-26 EP EP13788140.5A patent/EP2848858B1/en active Active
- 2013-04-26 WO PCT/JP2013/002837 patent/WO2013168392A1/ja active Application Filing
- 2013-04-26 JP JP2014514376A patent/JP6074628B2/ja active Active
- 2013-04-26 US US14/394,487 patent/US9229151B2/en active Active
- 2013-04-26 CN CN201380024463.5A patent/CN104272011A/zh active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004200128A (ja) | 2002-12-20 | 2004-07-15 | Koninkl Philips Electronics Nv | 補助光源及びそれを用いたフロントライト |
JP2005011599A (ja) * | 2003-06-17 | 2005-01-13 | Omron Corp | 面光源装置及び当該面光源装置を用いた機器 |
JP2005123049A (ja) * | 2003-10-17 | 2005-05-12 | Auto Network Gijutsu Kenkyusho:Kk | 導光板 |
JP2007225788A (ja) * | 2006-02-22 | 2007-09-06 | Citizen Electronics Co Ltd | 導光板及び該導光板を用いた表裏一体型バックライト及び該バックライトを用いた液晶表示装置。 |
JP2008052940A (ja) * | 2006-08-22 | 2008-03-06 | Citizen Electronics Co Ltd | 導光板及びその製造方法とその導光板を用いたバックライトユニット |
JP2009070643A (ja) * | 2007-09-12 | 2009-04-02 | Epson Imaging Devices Corp | 照明装置、液晶装置及び電子機器 |
JP2012059612A (ja) * | 2010-09-10 | 2012-03-22 | Dainippon Printing Co Ltd | 面発光装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2848858A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017516283A (ja) * | 2014-05-16 | 2017-06-15 | コーニング インコーポレイテッド | 液晶表示装置用のエッジライト型バックライトユニット |
JP7434733B2 (ja) | 2019-06-20 | 2024-02-21 | 大日本印刷株式会社 | 調光部材、調光装置 |
WO2022176348A1 (ja) * | 2021-02-17 | 2022-08-25 | パナソニックIpマネジメント株式会社 | 光学システム |
US11940647B2 (en) | 2021-02-17 | 2024-03-26 | Panasonic Intellectual Property Management Co., Ltd. | Optical system |
Also Published As
Publication number | Publication date |
---|---|
US9229151B2 (en) | 2016-01-05 |
JP6074628B2 (ja) | 2017-02-08 |
EP2848858A1 (en) | 2015-03-18 |
EP2848858B1 (en) | 2019-07-03 |
JPWO2013168392A1 (ja) | 2016-01-07 |
CN104272011A (zh) | 2015-01-07 |
US20150085530A1 (en) | 2015-03-26 |
EP2848858A4 (en) | 2015-06-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6074628B2 (ja) | 導光板 | |
JP4980425B2 (ja) | ディスプレイ | |
US8998478B2 (en) | Lighting assembly | |
US8353614B2 (en) | Backlight unit | |
US9523810B2 (en) | Illumination device and display device | |
WO2011013733A1 (ja) | 導光板、導光板の製造方法、面光源装置および液晶表示装置 | |
US8287172B2 (en) | Planar illumination device | |
JP2009043705A (ja) | 光方向転換を用いたlcdディスプレイ | |
JP2006310112A (ja) | 白色光源 | |
JP2009289701A (ja) | 照明装置、面光源装置、および液晶表示装置 | |
CN107667255B (zh) | 使用光导的照明系统和照明方法 | |
JP2009170205A (ja) | 導光板、導光板連結体、バックライトユニット、及び表示装置 | |
TWI436112B (zh) | 導光板、背光模組及液晶顯示裝置 | |
TWI460480B (zh) | 用於平面光源之導光板及其製造方法、與使用其之平面光源 | |
JP2005353406A (ja) | 導光板 | |
TWI605224B (zh) | 照明裝置 | |
JP5782806B2 (ja) | 照明ユニット及びこれを備えた表示装置 | |
JP2015191686A (ja) | 導光体、エッジライト型照明装置および画像表示装置 | |
JP2010044921A (ja) | 面光源素子並びにこれに用いる光制御部材及びこれを用いた画像表示装置 | |
TW201504699A (zh) | 導光板及使用該導光板的背光模組 | |
KR20100118807A (ko) | 정면휘도 및 광확산성이 개선된 광학필름, 이를 채용한 백라이트 유니트, 및 상기 백라이트 유니트를 구비한 액정표시장치 | |
JP5699550B2 (ja) | 隠蔽構造体を備えた照明ユニット、照明装置、表示装置 | |
JP2013134888A (ja) | 照明装置および表示装置 | |
JP2014093265A (ja) | 導光体、照明装置、表示装置 | |
KR101205198B1 (ko) | 측면 조광형 면광원 장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13788140 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013788140 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2014514376 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14394487 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |