WO2022105777A1 - 导光板、背光模组及显示装置 - Google Patents

导光板、背光模组及显示装置 Download PDF

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Publication number
WO2022105777A1
WO2022105777A1 PCT/CN2021/131127 CN2021131127W WO2022105777A1 WO 2022105777 A1 WO2022105777 A1 WO 2022105777A1 CN 2021131127 W CN2021131127 W CN 2021131127W WO 2022105777 A1 WO2022105777 A1 WO 2022105777A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
guide plate
microstructures
strip
Prior art date
Application number
PCT/CN2021/131127
Other languages
English (en)
French (fr)
Inventor
陈昊
翁巾婷
张嘉尹
蔡丰年
Original Assignee
瑞仪光电(苏州)有限公司
瑞仪光电股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 瑞仪光电(苏州)有限公司, 瑞仪光电股份有限公司 filed Critical 瑞仪光电(苏州)有限公司
Priority to CN202180005380.6A priority Critical patent/CN114830023A/zh
Priority to TW110143050A priority patent/TWI802092B/zh
Priority to TW112113690A priority patent/TWI827497B/zh
Publication of WO2022105777A1 publication Critical patent/WO2022105777A1/zh
Priority to US17/817,658 priority patent/US20220373731A1/en

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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
    • G02B6/005—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
    • G02B6/005—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
    • 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
    • G02F1/1336—Illuminating devices

Definitions

  • the present disclosure relates to a light guide element and applications thereof, and in particular, to a light guide plate, a backlight module and a display device.
  • the light guide plate has a light incident surface, a light exit surface and a reflection surface.
  • the light provided by the light source enters the light guide plate from the light incident surface of the light guide plate, and then exits from the light exit surface of the light guide plate.
  • microstructures are usually arranged on the light emitting surface or the reflective surface of the light guide plate.
  • the light entering the light guide plate is directed to the microstructure, because the amount of light reflected or refracted by the general microstructure is limited, not only the light cannot be effectively utilized, but also the light guide plate may easily produce optical appearance problems such as uneven light output. Therefore, how to improve the structure of the light guide plate so as to improve the brightness uniformity of the backlight module and make the light output quality of the backlight module meet the specifications of different panels has become the goal of the relevant industry.
  • the purpose of the present disclosure is to provide a light guide plate, a backlight module and a display device to solve the above problems.
  • a light guide plate which is used for coupling with a light source.
  • the light guide plate includes a light-emitting surface, a bottom surface, a light-incident surface, a plurality of strip-shaped microstructures, and a plurality of light-guiding microstructures.
  • the bottom surface is opposite to the light-emitting surface.
  • the light incident surface is connected between the light exit surface and the bottom surface, and the light emitted by the light source enters the light guide plate through the light incident surface.
  • a plurality of strip-shaped microstructures are disposed on at least one of the light-emitting surface and the bottom surface, wherein each strip-shaped microstructure has two opposite side surfaces and an action surface.
  • the two side surfaces are respectively connected to two opposite side edges of the active surface.
  • the light guide plate has a thickness direction, both side surfaces are inclined with respect to the action surface, and the two side surfaces have an included angle with the thickness direction respectively.
  • the light-guiding microstructures are arranged between any two adjacent strip-shaped microstructures, and are arranged along the extending direction of each strip-shaped microstructure.
  • the distance between the edges of the two side surfaces of each of the above-mentioned strip-shaped microstructures that are not connected to the active surface is greater than the width of the active surface.
  • the above-mentioned light guide plate has a light-reflecting surface opposite to the light-incident surface.
  • Each strip-shaped microstructure has a first part, a second part and a third part, wherein the first part has a first width and is close to the light-incident surface, the second part has a second width and is close to the light-incident surface, and the third part is located in the first part.
  • the portion is between the second portion and has a third width.
  • the third width is greater than the first width, and the first width is greater than the second width.
  • the above-mentioned light guiding microstructure includes a light-facing surface and a light-facing surface that are connected to each other, wherein the inclination of the light-facing surface is smaller than the inclination of the light-facing surface.
  • the light-facing surface includes a first reflecting surface and a second reflecting surface connected to each other, wherein the inclination of the first reflecting surface is smaller than the inclination of the second reflecting surface.
  • One of the first reflecting surface and the second reflecting surface is connected to the reflecting light surface.
  • the above-mentioned light guide plate has a length direction, and the length direction is perpendicular to the light incident surface, wherein each light guide microstructure has a ratio, and the ratio is the projected length of the second reflective surface in the length direction divided by the first reflective surface.
  • the projected length of a reflective surface in the length direction, and the ratio of the light-guiding microstructures far from the light-incident surface is smaller than the ratio of the light-guiding microstructures adjacent to the light-incident surface.
  • a light guide plate which is used for coupling with a light source.
  • the light guide plate includes a light-emitting surface, a bottom surface, a light-incident surface, a plurality of strip-shaped microstructures, and a plurality of light-guiding microstructures.
  • the bottom surface is opposite to the light-emitting surface.
  • the light incident surface is connected between the light exit surface and the bottom surface, and the light emitted by the light source enters the light guide plate through the light incident surface.
  • a plurality of strip-shaped microstructures are disposed on at least one of the light-emitting surface and the bottom surface.
  • the light-guiding microstructures are arranged between any two adjacent strip-shaped microstructures, and are arranged along the extending direction of each strip-shaped microstructure.
  • the arrangement density of the plurality of light guide microstructures is an increasing function of the refractive index of the light guide plate.
  • each of the above-mentioned strip-shaped microstructures has two opposite side surfaces and an active surface, wherein the two side surfaces are respectively connected to two opposite sides of the active surface, and the light guide plate has a thickness direction.
  • the two side surfaces are respectively inclined with respect to the action surface, and the two side surfaces respectively have an included angle with the thickness direction.
  • the distance between the edges of the two side surfaces of each of the above-mentioned strip-shaped microstructures that are not connected to the active surface is greater than the width of the active surface.
  • the above-mentioned light guide plate has a light-reflecting surface opposite to the light-incident surface.
  • Each strip-shaped microstructure has a first part, a second part and a third part, wherein the first part has a first width and is close to the light-incident surface, the second part has a second width and is close to the light-incident surface, and the third part is located in the first part.
  • the portion is between the second portion and has a third width.
  • the third width is greater than the first width, and the first width is greater than the second width.
  • each of the above-mentioned light guide microstructures includes a light-facing surface and a light-facing surface that are connected to each other, wherein the inclination of the light-facing surface is smaller than the inclination of the light-facing surface.
  • the light-facing surface includes a first reflecting surface and a second reflecting surface connected to each other, wherein the inclination of the first reflecting surface is smaller than the inclination of the second reflecting surface.
  • One of the first reflecting surface and the second reflecting surface is connected to the light-reflecting surface.
  • the above-mentioned light guide plate has a length direction, and the length direction is perpendicular to the light incident surface, wherein each light guide microstructure has a ratio, and the ratio is the projected length of the second reflective surface in the length direction divided by the first reflective surface.
  • the projected length of a reflective surface in the longitudinal direction, and the ratio of the light-guiding microstructures far from the light-incident surface is smaller than the ratio of the light-guiding microstructures adjacent to the light-incident surface.
  • a backlight module includes the above-mentioned light guide plate.
  • the light source is adjacent to the light incident surface.
  • the above-mentioned prism sheet has a plurality of prism structures, and the extending direction of each prism structure is parallel to the light incident surface.
  • a display device includes the aforementioned backlight module and display panel.
  • the display panel is arranged above the backlight module.
  • the present disclosure changes the path of light in the light guide plate by means of the strip-shaped microstructure with double side surfaces and the action surface, and combines the light guide microstructure to adjust the light output position and light output amount of the light, so the adjustment can be achieved.
  • FIG. 1 is a schematic diagram illustrating a device of a backlight module according to a first embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram illustrating a light guide plate according to a first embodiment of the present disclosure
  • FIG. 3 is a partial cross-sectional schematic diagram illustrating a light guide plate according to the first embodiment of the present disclosure
  • FIG. 4 is a partial top view illustrating a light guide plate according to a second embodiment of the present disclosure.
  • FIG. 5 is a side view illustrating a light guide plate according to a third embodiment of the present disclosure.
  • FIG. 6 is a device schematic diagram illustrating a display device according to an embodiment of the present disclosure.
  • the light guide plate of the present disclosure can be used in a backlight module, and the backlight module can be used as a light source of a display device.
  • Each element in the backlight module includes a bottom surface and a top surface. The definition of the bottom surface and the top surface is based on the display panel in the display device. The side away from the display panel of each component is the bottom surface, and the side facing the display panel is the top surface. .
  • that an element is disposed above another element means that the one element is disposed on the top surface of the other element or above the top surface of the other element.
  • FIG. 1 is a schematic diagram illustrating a device of a backlight module according to a first embodiment of the present disclosure
  • FIG. 2 is a schematic diagram illustrating a structure of a light guide plate according to the first embodiment of the present disclosure.
  • the backlight module 100 of this embodiment mainly includes a light source 200 and a light guide plate 300 .
  • the light source 200 is configured to provide light into the light guide plate 300 .
  • the light guide plate 300 includes a light exit surface 310 , a bottom surface 320 , a light incident surface 330 , a light-reflecting incident surface 340 , a plurality of strip-shaped microstructures 350 and a plurality of light guiding microstructures 360 .
  • the light incident surface 330 is opposite to the anti-light incident surface 340 .
  • the bottom surface 320 and the light exit surface 310 are respectively connected on opposite sides of the light incident surface 330 .
  • the light source 200 is disposed adjacent to the light incident surface 330 , so the light emitted by the light source 200 enters the light guide plate 300 through the light incident surface 330 .
  • the strip-shaped microstructures 350 may be disposed on at least one of the light-emitting surface 310 and the bottom surface 320 . In the embodiments of FIGS. 1 and 2 , the strip-shaped microstructures 350 are disposed on the bottom surface 320 .
  • the light guide plate 300 has a length direction L1 and a thickness direction T1 , wherein the length direction L1 is perpendicular to the extending direction of the light incident surface 330 , and the strip-shaped microstructures 350 extend along the length direction L1 of the light guide plate 300 .
  • one end of the strip-shaped microstructure 350 is connected to the light-incident surface 330 , and the other end is connected to the light-incident surface 340 .
  • the strip-shaped microstructures 350 are arranged discontinuously along the extending direction of the light incident surface 330 .
  • each strip-shaped microstructure 350 has two opposite side surfaces (for example, side surfaces 351 and 352 ) and an active surface 353 .
  • the side surface 351 and the side surface 352 are respectively connected to two opposite sides of the action surface 353 .
  • the cross section of each strip-shaped microstructure 350 is a trapezoid, and the action surface 353 is a plane.
  • the working surface 353 is parallel to the bottom surface 320 .
  • the side surface 351 and the side surface 352 are inclined with respect to the working surface 353 , and the side surface 351 and the side surface 352 have an included angle ⁇ 1 and an included angle ⁇ 2 with the thickness direction T1 respectively.
  • the included angle ⁇ 1 and the included angle ⁇ 2 are mainly used to determine the inclination of the side surface 351 and the side surface 352 with respect to the side surface 351 .
  • the function of the strip-shaped microstructures 350 is that when the light is reflected back and forth between the light-emitting surface 310 and the bottom surface 320 of the light guide plate 300 due to the principle of total reflection, the function of the side surfaces 351 and the side surfaces 352 is changed.
  • the traveling direction of the light inside the light guide plate 300, combined with the design of the action surface 353, can control the light exit angle of the light emitted from the light guide plate 300, so as to achieve the purpose of adjusting the light exit angle.
  • the design of the side surface and the action surface of the strip-shaped microstructure 350 of the present disclosure is easier to control in mold processing. Specifically, by designing the side surface 351 and the side surface 352 as inclined surfaces and inclined relative to the action surface 353, it is easier to control the included angle ⁇ 1 and the included angle ⁇ 2 during processing to determine the slope of the side surface 351 and the side surface 352. If the strip-shaped microstructure is replaced with an arc-shaped strip-shaped structure with a semicircular cross-section, it will be difficult to control the exit direction of the light due to the curvature of the arc surface itself.
  • the strip-shaped microstructure is replaced with a V-shaped structure with an inverted triangular cross-section, the light will easily enter from one side of the triangle to the other side, resulting in the light being refracted and reflected multiple times and the direction of the light cannot be controlled.
  • FIG. 3 is a schematic partial cross-sectional view of the light guide plate according to the first embodiment of the present disclosure.
  • the light B1 strikes the side surface 352 of the strip-shaped microstructure 350 , it will first interact with the side surface 352 to exit the light guide plate 300 , and is further reflected by the reflective sheet 370 disposed at the bottom of the light guide plate 300 before entering the light guide plate 300 again , and the light entering the light guide plate 300 again will emit light in the direction of the normal line of the light emitting surface 310 of the light guide plate 300 , so as to achieve the purpose of converging the viewing angle of the light.
  • the light B2 strikes the side surface 351 of the strip-shaped microstructure 350, because the two side surfaces 351 and the side surface 352 of the strip-shaped microstructure 350 are separated by the action surface 353 and are not directly connected, the light B2 reflected by the side surface 351 The light is not emitted from the side surface 352 , but is reflected by the action surface 353 and then emitted from the light emitting surface 310 of the light guide plate 300 . It can be seen that, through the design of the side surfaces 351 , 352 and 353 of the strip-shaped microstructure 350 , since the slopes of the side surfaces 351 and 352 are fixed values, there will be no curvature change, so the light rays B1 and B2 will have fixed slopes.
  • the reflection or refraction of the light is not easy to be controlled, and the light is prone to divergent left and right viewing angles when the light is emitted, so the disadvantage of uncontrollable viewing angle is prone to occur.
  • the inverted triangle V-shaped strip structure lacks the action surface 353 parallel to the light-emitting surface 310 or the bottom surface 320, the light will be refracted by the inclined surface with a fixed slope in a larger proportion. However, it leaves the light guide plate and enters the air layer and is then reflected by the reflective sheet. This kind of light tends to cause energy consumption due to traveling between different media.
  • the distance D1 between the side surface 351 of each strip-shaped microstructure 350 and the edge of the side surface 352 not connected to the active surface 353 is greater than the width of the active surface 353 D2. Since the probability of occurrence of light B2 is smaller than that of light B1, reducing the width D2 of the action surface 353 can increase the probability of occurrence of light B1, effectively converge left and right viewing angles, and reduce noise.
  • the light guide microstructure 360 is disposed between any two adjacent strip-shaped microstructures 350 , and the light-guiding microstructure 360 is along the extending direction of the stripe-shaped microstructure 350 (that is, the guide The light plates 300 are arranged in the longitudinal direction L1).
  • the function of the light guide microstructure 360 is that when the light travels in the light guide plate 300 in the direction from the light incident surface 330 to the light incident surface 340 , the plane ratio is reduced by the concave and convex design of the light guide microstructure 360 . In order to destroy the total reflection, the light is emitted from the light guide plate 300 to increase the light output ratio.
  • each light guide microstructure 360 is an asymmetric triangular structure, and includes a light-facing surface 361 and a light-reversing surface 362 that are connected to each other.
  • the light-facing surface 361 refers to the surface facing the light source 200 (that is, the direct light-receiving surface), and the light-facing surface 362 refers to the surface opposite to the light-facing surface and facing away from the light source 200 .
  • the inclination of the light-facing surface 361 is smaller than the inclination of the light-facing surface 362 , and in terms of structural design, the area of the light-facing surface 361 is larger than the area of the light-facing surface 362 , so as to increase the amount of reflected light.
  • the arrangement density of the light guide microstructures 360 depends on the refractive index of the light guide plate 300 .
  • the arrangement density of the light guide microstructures 360 is an increasing function of the refractive index of the light guide plate 300.
  • the refractive index of the light guide plate 300 is larger, it means that the light guide plate 300 belongs to an optically dense medium, and it is more difficult to emit light.
  • each strip-shaped microstructure 350 gradually decreases from one end close to the light incident surface 330 to the other end close to the light incident surface 340 . That is to say, the area of the strip-shaped microstructures 350 close to the light-incident surface 330 has a higher proportion than that far from the light-incident surface 330 . Relatively, the area of the strip-shaped microstructures 350 disposed between adjacent strip-shaped microstructures 350 is used for The light guide microstructure 360 with improved light output ratio occupies a larger area far from the light incident surface 330 than the area close to the light incident surface 330 , thereby increasing the light output of the light guide plate 300 away from the light incident surface 330 .
  • the strip-shaped microstructures may also have different structural designs.
  • FIG. 4 is a partial top view of the light guide plate according to the second embodiment of the present disclosure.
  • the structure of the light guide plate 400 of the embodiment of FIG. 4 is substantially the same as that of the light guide plate 300 shown in FIGS. 1 to 3 , the difference is only that the strip-shaped microstructures 410 of the light guide plate 400 have different width variations. As shown in FIG.
  • the light guide plate 400 includes strip-shaped microstructures 410 and light-guiding microstructures 420 disposed on the bottom surface (reflection surface) or light-emitting surface of the light-guiding plate 400 , and the light-guiding microstructures 420 are disposed on any two adjacent strips between the microstructures 410 .
  • the solid line of each strip-shaped microstructure 410 in FIG. 4 is the overall outline, and the dotted line in the middle is the lower knife path when the strip-shaped microstructure 410 mold is made.
  • the structural design principles and functions of the strip-shaped microstructures 410 and the light-guiding microstructures 420 are the same as those of the strip-shaped microstructures 350 and the light-guiding microstructures 360 in FIGS. .
  • the first part of the strip-shaped microstructure 410 close to the light incident surface 401 has a width W2
  • the second part of the strip-shaped microstructure 410 close to the light-incident surface 402 has a width W3
  • the first part of the strip-shaped microstructure 410 has a width W3.
  • a third portion is defined between the second portion and the third portion, and the third portion has a width W4.
  • the width W4 is greater than the width W2, and the width W2 is greater than the width W3, so the width of the strip-shaped microstructure 410 changes, that is, the strip-shaped microstructure 410 is close to the light incident surface 401 of the light guide plate 400 and far away from the light guide plate 400.
  • the area occupied by the surface 401 (that is, the light-reflecting surface 402 ) and the middle part of the light guide plate 400 are different, so the light output at different positions of the light guide plate 400 can be controlled respectively, thereby improving the uniformity of the light output of the overall light guide plate 400 Spend.
  • the width W2 near the light incident surface 401 is the smallest (smaller than the width W3 and the width W4), the width ratio of the light guide microstructure 420 on the light incident side is the largest.
  • the area of the strip-shaped microstructures 410 close to the light incident surface 401 accounts for a higher proportion than the area far from the light incident surface 401 .
  • the light guide microstructures 420 used to improve the light output ratio are farther away from the light incident surface 401 .
  • the area of the light guide plate 400 accounts for a higher proportion than the area close to the light incident surface 401 , so the light output amount of the light guide plate 400 at a position far from the light incident surface 401 can be increased.
  • the light guiding microstructure of the present disclosure can also have different structural designs.
  • FIG. 5 is a side view of a light guide plate according to a third embodiment of the present disclosure.
  • the structure of the light guide plate 500 of the embodiment of FIG. 5 is substantially the same as that of the light guide plate 300 shown in FIGS. 1 to 3 , and the difference is only that the light guide microstructures 520 of the light guide plate 500 have different structural designs. As shown in FIG.
  • the light guide plate 500 mainly includes strip-shaped microstructures 510 and light-guiding microstructures 520 , and the strip-shaped microstructures 510 and the light-guiding microstructures 520 are disposed on the bottom surface 501 , and the light-guiding microstructures 520 are disposed at any between two adjacent strip-shaped microstructures 510 .
  • the structural design principles and functions of the strip-shaped microstructures 510 are the same as those of the aforementioned strip-shaped microstructures 350 , and thus will not be repeated here.
  • the light guide microstructure 520 includes a light-facing surface 521 and a light-facing surface 522 that are connected to each other, wherein the light-facing surface 521 includes a first reflecting surface 521a and a second reflecting surface 521b that are connected to each other.
  • the first reflection surface 521a is connected to the light-reflecting surface 522, and the inclination of the first reflection surface 521a is smaller than the inclination of the second reflection surface 521b.
  • the inclination of the first reflecting surface 521 a is relatively small, so the light B3 needs to be reflected more times before it can be emitted from the light exit surface 502 of the light guide plate 500 .
  • the inclination of the second reflecting surface 521b is relatively large, so the light B4 can be emitted from the light exit surface 502 of the light guide plate 500 as long as the number of times of reflection is small.
  • the light-emitting position, light-emitting angle and light of the light with long and short optical paths can be further regulated Allocate the ratio to meet the specifications required for subsequent display panels at different application levels.
  • the light guide plate 500 is defined to have a length direction L2 , and the length direction L2 is perpendicular to the extending direction of the light incident surface 503 of the light guide plate 500 .
  • the light guide microstructures 520 are marked separately along the length direction L2, namely, the light guide microstructures 520a, 520b and 520c in sequence.
  • the first reflection surface 521a and the second reflection surface 521b of the light guide microstructure 520a respectively have a projected length a1 and a projected length b1 in the longitudinal direction L2, and the ratio of the projected length b1 to the projected length a1 is P1.
  • the first reflective surface 521a and the second reflective surface 521b of the light guide microstructure 520b respectively have a projected length a2 and a projected length b2 in the longitudinal direction L2, and the ratio of the projected length b2 to the projected length a2 is P2.
  • the first reflection surface 521a and the second reflection surface 521b of the light guide microstructure 520c respectively have a projected length a3 and a projected length b3 in the longitudinal direction L2, and the ratio of the projected length b3 to the projected length a3 is P3.
  • the ratio P3 of the light guide microstructures 520c far away from the light incident surface 503 is smaller than the ratio P2 of the light guide microstructures 520c adjacent to the light incident surface 503 . That is to say, the projected lengths of the first reflective surfaces 521a of the light guide microstructures 520a, 520b and 520c in the longitudinal direction L2 gradually increase as the distance from the light incident surface 503 increases, while the light guide microstructures 520b and 520c have a projection length in the longitudinal direction L2 The projection lengths of the structures 520a, the light guiding microstructures 520b and the second reflecting surfaces 521b of the light guiding microstructures 520c in the longitudinal direction L2 gradually decrease as they move away from the light incident surface 503, such that P1>P2>P3.
  • the projection length a1 of the first reflection surface 521a of the light guide microstructure 520a adjacent to the light incident surface 503 in the longitudinal direction L2 is short and the area is small, so the ratio of total reflection can be reduced, and the light with long optical path can be reduced ;
  • the projection length b1 of the second reflection surface 521b of the light guide microstructure 520a adjacent to the light incident surface 503 is longer and the area is larger, so the proportion of light emitted from the light guide plate 500 from here can be increased, and the light with short optical path is increased, so A higher proportion of light with a shorter optical path can be provided in the area close to the light incident surface 503 , which further improves the occurrence of dark bands in the area close to the light incident surface 503 .
  • the light guide microstructure 520 can be designed to produce light with a long optical path as Mainly, the projected length b3 of the second reflection surface 521b of the light guide microstructure 520c is shorter and the area is smaller, while the projected length a3 of the first reflection surface 521a of the light guide microstructure 520 is longer and the area is larger, so as to meet the The light output requirement of the position of the light guide plate 500 away from the light incident surface 503 .
  • the ratios P1 , P2 , and P3 of the light guide microstructure 520 a , the light guide microstructure 520 b and the light guide microstructure 520 c can also be designed to be equal according to requirements. In this way, the distribution ratio of the light with the longer optical path and the shorter optical path along the length direction L2 is fixed, so that the mold of the light guide plate 500 is easy to manufacture, which is beneficial to reduce the production cost.
  • FIG. 6 is a device schematic diagram illustrating a display device according to an embodiment of the present disclosure.
  • the display device 600 of this embodiment includes the backlight module 100 as shown in FIG. 1 , a display panel 610 , at least one film 620 , and a reflective sheet 370 .
  • the film 620 is disposed in front of the light guide plate 300 of the backlight module 100 (light exit side)
  • the reflective sheet 370 is disposed behind the light guide plate 300 of the backlight module 100
  • the display panel 610 is disposed on the film The light-emitting side of the 620.
  • the display device 600 can also adjust the travel direction and the light exit direction of the light guide plate 300 by means of the design of the strip-shaped microstructures 350 and the light guide microstructures 360 on the light guide plate 300 , thereby achieving the purpose of controlling the viewing angle of the light.
  • the backlight module 100 shown in FIG. 1 is applied to the display device 600 for illustration purposes only, and is not intended to limit the present invention.
  • the light guide plates (eg, the light guide plate 400 or the light guide plate 500 ) of the aforementioned other embodiments can be applied to the display device to produce the same effect.
  • the present disclosure uses a strip-shaped microstructure with double sides and an action surface to change the path of light in the light guide plate, and combines the light guide microstructure to adjust the light output position and light output amount of the light. Therefore, the purpose of adjusting the viewing angle of the light output and improving the overall light output uniformity can be achieved.

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Abstract

一种导光板（300）、背光模组（100）及显示装置。导光板（300）用以与光源（200）耦合。导光板（300）包含出光面（310）、底面（320）、入光面（330）、多个条状微结构（350）以及多个导光微结构（360）。底面（320）与出光面（310）相对。入光面（330）连接于出光面（310）及底面（320）之间。光源（200）所射出的光线经由入光面（330）进入到导光板（300）。多个条状微结构（350）设置于出光面（310）及底面（320）中的至少一者上，且每一个条状微结构（350）具有相对的两个侧面（351，352）以及作用面（353）。两个侧面（351，352）分别连接于作用面（353）的相对两个侧边。导光板（300）具有厚度方向。两个侧面（351，352）均相对于作用面（353）倾斜，且两个侧面（351，352）分别与厚度方向之间具有夹角。导光微结构（360）设置在任意两个相邻的条状微结构（350）之间，且沿着每一个条状微结构（350）的延伸方向排列。

Description

导光板、背光模组及显示装置 技术领域
本揭露涉及一种导光元件及其应用，且特别是涉及导光板、背光模组及显示装置。
背景技术
导光板具有入光面、出光面以及反射面。光源所提供的光线由导光板的入光面进入导光板中，再由导光板的出光面射出。为了使经过导光板内部的光源能够更均匀地混合，通常会在导光板的出光面或反射面设置微结构。
然而，进入导光板的光线在射向微结构时，因为一般微结构所反射或折射的光线量有限，所以不但无法有效地利用光线，还容易使导光板产生出光不均匀等光学外观问题。因此，如何改良导光板的结构，以提升背光模组亮度均匀性，并使背光模组的出光质量能够满足不同面板的规格，遂成为相关业者努力的目标。
发明内容
因此，本揭露的目的在于提供导光板、背光模组及显示装置，以解决上述问题。
根据本揭露的上述目的，提出一种导光板，此导光板用以与光源耦合。其中导光板包含出光面、底面、入光面、多个条状微结构以及多个导光微结构。底面与出光面相对。入光面连接于出光面及底面之间，光源所射出的光线经由入光面进入到导光板。多个条状微结构设置于出光面及底面中的至少一者上，其中每一个条状微结构具有相对的两个侧面以及作用面。两个侧面分别连接于作用面的相对两个侧边。导光板具有厚度方向，两个侧面均相对于作用面倾斜，且两个侧面分别与厚度方向之间具有夹角。导 光微结构设置在任意两个相邻的条状微结构之间，且沿着每一个条状微结构的延伸方向排列。
依据本揭露的一实施例，上述的每一个条状微结构的两个侧面未与作用面连接的边缘之间的距离大于作用面的宽度。
依据本揭露的一实施例，上述的导光板具有与入光面相对的反入光面。每一个条状微结构具有第一部分、第二部分与第三部分，其中第一部分具有第一宽度且靠近入光面，第二部分具有第二宽度且靠近反入光面，第三部分位于第一部分与第二部分之间且具有第三宽度。第三宽度大于第一宽度，且第一宽度大于第二宽度。
依据本揭露的一实施例，上述的导光微结构包含互相连接的迎光面以及反迎光面，其中迎光面的倾斜程度小于反迎光面的倾斜程度。
依据本揭露的一实施例，上述的迎光面包含彼此相连的第一反射面以及第二反射面，其中第一反射面的倾斜程度小于第二反射面的倾斜程度。第一反射面及第二反射面的其中一者连接于反迎光面。
依据本揭露的一实施例，上述的导光板具有长度方向，长度方向垂直于入光面，其中每一个导光微结构具有比值，比值为第二反射面在长度方向上的投影长度除以第一反射面在该长度方向上的投影长度，而且远离入光面的导光微结构的比值小于邻近入光面的导光微结构的比值。
根据本揭露的上述目的，提出一种导光板，此导光板用以与光源耦合。其中导光板包含出光面、底面、入光面、多个条状微结构以及多个导光微结构。底面与出光面相对。入光面连接于出光面及底面之间，光源所射出的光线经由入光面进入到导光板。多个条状微结构设置于出光面及底面中的至少一者上。导光微结构设置在任意两个相邻的条状微结构之间，且沿着每一条状微结构的延伸方向排列。其中，多个导光微结构的排列密度是导光板的折射率的增函数。
依据本揭露的一实施例，上述的每一个条状微结构具有相对的两个侧面以及作用面，其中两个侧面分别连接于作用面的相对两个侧边，其中导光板具有厚度方向。两个侧面分别相对于作用面倾斜，且两个侧面分别与厚度方向之间具有夹角。
依据本揭露的一实施例，上述的每一个条状微结构的两个侧面未与作用面连接的边缘之间的距离大于作用面的宽度。
依据本揭露的一实施例，上述的导光板具有与入光面相对的反入光面。每一个条状微结构具有第一部分、第二部分与第三部分，其中第一部分具有第一宽度且靠近入光面，第二部分具有第二宽度且靠近反入光面，第三部分位于第一部分与第二部分之间且具有第三宽度。第三宽度大于第一宽度，且第一宽度大于第二宽度。
依据本揭露的一实施例，上述的每一个导光微结构包含互相连接的迎光面以及反迎光面，其中迎光面的倾斜程度小于反迎光面的倾斜程度。
依据本揭露的一实施例，上述的迎光面包含彼此相连的第一反射面以及第二反射面，其中第一反射面的倾斜程度小于第二反射面的倾斜程度。第一反射面与第二反射面的其中一者连接反迎光面。
依据本揭露的一实施例，上述的导光板具有长度方向，长度方向垂直于入光面，其中每一个导光微结构具有比值，比值为第二反射面在长度方向上的投影长度除以第一反射面在长度方向上的投影长度，而且远离入光面的导光微结构的比值小于邻近入光面的导光微结构的比值。
根据本揭露的上述目的，提出一种背光模组。此背光模组包含上述导光板。光源邻设于入光面。
依据本揭露的一实施例，上述的该棱镜片具有多个棱镜结构，且每一个棱镜结构的延伸方向平行于该入光面。
根据本揭露的上述目的，提出一种显示装置。此显示装置包含前述的背光模组及显示面板。显示面板设置在背光模组的上方。
由上述可知，本揭露通过具有双侧面与作用面的条状微结构来改变光线在导光板中的行径路径，并结合导光微结构来调配光线的出光位置与出光量，故可达到调整出光视角与提升整体出光均匀度的目的。
附图说明
为了更完整地了解实施例及其优点，现在参照附图做出下列描述，其中：
图1是绘示依照本揭露的第一实施方式的背光模组的装置示意图；
图2是绘示依照本揭露的第一实施方式的导光板的结构示意图；
图3是绘示依照本揭露的第一实施方式的导光板的局部剖面示意图；
图4是绘示依照本揭露的第二实施方式的导光板的局部俯视图；
图5是绘示依照本揭露的第三实施方式的导光板的侧视图；以及
图6是绘示依照本揭露的一实施方式的显示装置的装置示意图。
具体实施方式
本揭露的导光板可用于背光模组，背光模组可作为显示装置的光源。背光模组中的各元件包含底面与顶面，底面及顶面的定义以显示装置中的显示面板为参考基准，各元件的远离显示面板的一面为底面，而面向显示面板的一面为顶面。此外，本揭露中，一个元件设置于另一元件的上方，是指该一个元件设置于该另一元件的顶面或该另一元件的顶面的上方。
请参照图1及图2，图1是绘示依照本揭露的第一实施方式的背光模组的装置示意图，图2是绘示依照本揭露的第一实施方式的导光板的结构示意图。本实施方式的背光模组100主要包含光源200以及导光板300。光源200配置以提供光线至导光板300中。其中，导光板300包含出光面310、底面320、入光面330、反入光面340、多个条状微结构350以及多个导光微结构360。入光面330相对于反入光面340。底面320与出光面310则分别连接在入光面330的相对两侧。光源200邻设于入光面330，故光源200所射出的光线经由入光面330进入到导光板300中。
在一些实施例中，条状微结构350可设置于出光面310与底面320的至少一者上。在图1及图2的实施例中，条状微结构350设置在底面320上。在本实施例中，导光板300具有长度方向L1与厚度方向T1，其中长度方向L1垂直于入光面330的延伸方向，条状微结构350沿着导光板300的长度方向L1延伸。在一些实施例中，条状微结构350的一端连接入光面330，另一端连接反入光面340。其中，在本实施例中，条状微结构350沿着入光面330的延伸方向不连续地排列。
在本实施例中，每一个条状微结构350具有相对的两个侧面(例如侧 面351、侧面352)以及作用面353。侧面351与侧面352分别连接于作用面353的相对两个侧边。具体而言，每一个条状微结构350的截面为梯形，且作用面353为平面，也就是说，当条状微结构350设置于出光面310时，作用面353平行于出光面310，当条状微结构350设置于底面320时，作用面353平行于底面320。其中，侧面351与侧面352相对于作用面353倾斜，且侧面351与侧面352分别与厚度方向T1之间具有夹角θ1与夹角θ2。在本实施例中，夹角θ1与夹角θ2主要用来决定侧面351与侧面352相对于侧面351的倾斜程度。在本实施例中，条状微结构350所发挥的功能，是当光线在导光板300的出光面310与底面320之间因全反射原理而来回反射时，借由侧面351与侧面352来改变光线在导光板300内部的光线的行径方向，并结合作用面353的设计，可控制光线从导光板300射出的出光角度，达到调整出光视角的目的。此外，本揭露的条状微结构350的侧面与作用面的设计，在模具加工上较容易控制。具体而言，通过将侧面351与侧面352设计成斜面并相对于作用面353倾斜的方式，在加工时较容易控制夹角θ1与夹角θ2，以决定侧面351与侧面352的斜率。若将条状微结构换成截面为半圆形的圆弧条状结构的话，则会因为圆弧表面本身具有曲率的变化而使得光线的出光方向不易控制。若将条状微结构换成截面为倒三角形的V形状结构的话，则会因为光线容易从三角形一个侧面进入至另一个侧面，而导致光线经过多次折射与反射而无法控制出光方向。
具体而言，请参照图3所示，图3是绘示依照本揭露的第一实施方式的导光板的局部剖面示意图。当光线B1射向条状微结构350的侧面352时，会先与侧面352作用而射出导光板300外，并进一步被设置在导光板300底部的反射片370反射后而再次进入导光板300中，且再次进入导光板300的光线则会以偏向导光板300的出光面310的法线方向出光，达到收敛出光视角的目的。当光线B2射向条状微结构350的侧面351时，因为条状微结构350的两个侧面351与侧面352之间以作用面353隔开而不直接相连，故被侧面351反射的光线B2并不会从侧面352射出，而是被作用面353反射后从导光板300的出光面310出光。由此可知，通过条状微结构350的侧面351、侧面352与作用面353的设计，由于侧面351、侧面352的斜率 是固定值而不会产生曲率变化，因此光线B1、B2会被固定斜率的斜面所反射或折射，而朝向特定的作用面353或反射片370前进，因此可达到调整光线的出光方向的目的，有效收敛左右侧视角，降低噪声。如果是曲率变化的圆弧表面，光线于此处所产生的反射或折射就不易受到控制，且光线在出光时容易产生发散的左右视角，因此容易出现视角大小不可控的缺点。如果以倒三角形的V形条状结构来看，倒三角形的V形条状结构因为欠缺平行于出光面310或底面320的作用面353，所以光线会有更大比例被固定斜率的斜面所折射而离开导光板进入空气层再被反射片予以反射，此种光线因在不同介质之间行进则容易造成能量耗损的缺点。
在一实施例中，请一并参照图1及图2所示，每一个条状微结构350的侧面351及侧面352未与作用面353连接的边缘之间的距离D1大于作用面353的宽度D2。由于光线B2的发生机率小于光线B1的发生机率，因此缩小作用面353的宽度D2，可以提高光线B1的发生机率，有效收敛左右侧视角，降低噪声。
请继续参照图1及图2，导光微结构360设置在任意两个相邻的条状微结构350之间，且导光微结构360沿着条状微结构350的延伸方向(也就是导光板300的长度方向L1)排列。导光微结构360所发挥的功能，是当光线在导光板300中沿着由入光面330往反入光面340的方向行进时，借由导光微结构360的凹凸设计而降低平面比例以破坏全反射，使得光线从导光板300出光，以提高出光比例。在本实施例中，每一个导光微结构360为不对称的三角形结构，且包含互相连接的迎光面361以及反迎光面362。其中迎光面361是指面向光源200的表面(也就是直接受光面)，反迎光面362是指相对于迎光面且背对光源200的表面。在本实施例中，迎光面361的倾斜程度小于反迎光面362的倾斜程度，且在结构设计上，迎光面361的面积大于反迎光面362的面积，借以增加光线的反射量，进而提升光线的使用效率。在一实施例中，导光微结构360的排列密度取决于导光板300的折射率。具体而言，导光微结构360的排列密度是导光板300的折射率的增函数，当导光板300的折射率越大时，代表导光板300属于光密介质，越不容易出光，此时导光微结构360的排列密度则越大，凹凸 程度越高、平面比例越低，以提高出光比例。
再参阅图2，在一实施例中，每一个条状微结构350的宽度W1从靠近入光面330的一端往靠近反入光面340的另一端渐减。也就是说，条状微结构350在靠近入光面330的面积占比，较远离入光面330的面积占比高，相对地，设置在相邻的条状微结构350之间的用来提高出光比例的导光微结构360在远离入光面330的面积占比较靠近入光面330的面积占比高，借以增加导光板300远离入光面330的位置的光线出光量。
在前述实施例中，条状微结构亦可有不同的结构设计。请参照图4，其是绘示依照本揭露的第二实施方式的导光板的局部上视图。图4实施例的导光板400的结构与图1至图3所示的导光板300大致上相同，差异仅在于导光板400的条状微结构410具有不同的宽度变化。如图4所示，导光板400包含设置在其底面(反射面)或出光面上的条状微结构410以及导光微结构420，且导光微结构420设置在任意两个相邻的条状微结构410之间。另外要说明的是，图4中每个条状微结构410的实线为整体轮廓，中间虚线为制作条状微结构410模具时的下刀路径。在本实施例中，条状微结构410与导光微结构420的结构设计原则与功能均与图1至图3的条状微结构350与导光微结构360相同，故于此不再赘述。在本实施例中，条状微结构410靠近入光面401的第一部分具有宽度W2，条状微结构410靠近反入光面402的第二部分具有宽度W3，条状微结构410的第一部分与第二部分之间定义为第三部分，且第三部分具有宽度W4。其中，宽度W4大于宽度W2，且宽度W2大于宽度W3，故通过条状微结构410的宽度变化，即条状微结构410在靠近导光板400的入光面401、远离导光板400的入光面401(也就是反入光面402)、以及导光板400的中间部分所占的面积不同，故可分别控制导光板400的不同位置的出光量，进而可提升整体导光板400的出光均齐度。一方面，在靠近入光面401的宽度W2最小(小于宽度W3与宽度W4)，导光微结构420在入光侧的宽度占比为最大，故可解决先前技术中容易在入光侧产生亮暗纹的问题。另一方面，条状微结构410在靠近入光面401的面积占比较远离入光面401的面积占比高，相对地，用来提高出光比例的导光微结构420在远离入光面401的面积占比 较靠近入光面401的面积占比高，故可增加导光板400远离入光面401的位置的光线出光量。
本揭露的导光微结构亦可有不同的结构设计。请参照图5，其是绘示依照本揭露的第三实施方式的导光板的侧视图。图5实施例的导光板500的结构与图1至图3所示的导光板300大致上相同，差异仅在于导光板500的导光微结构520具有不同的结构设计。如图5所示，导光板500主要包含条状微结构510以及导光微结构520，且条状微结构510以及导光微结构520设置在底面501上，且导光微结构520设置在任意两个相邻的条状微结构510之间。其中，条状微结构510的结构设计原则与功能均与前述的条状微结构350相同，故于此不再赘述。在本实施例中，导光微结构520包含互相连接的迎光面521以及反迎光面522，其中迎光面521包含彼此相连的第一反射面521a以及第二反射面521b。其中，第一反射面521a连接于反迎光面522，且第一反射面521a的倾斜程度小于第二反射面521b的倾斜程度。
如图5所示，第一反射面521a的倾斜程度较小，故光线B3需反射较多次，才可从导光板500的出光面502射出。第二反射面521b的倾斜程度较大，故光线B4只要经较少反射的次数，即可从导光板500的出光面502射出。由此可知，光线经过不同倾斜程度的第一反射面521a与第二反射面521b的反射作用后，可产生光程较长的光线(例如光线B3)及光程较短的光线(例如光线B4)，如此，便可使得部分光线提前出光，而部分光线继续往反入光面前进。
在一些实施例中，可通过调整第一反射面521a与第二反射面521b的倾斜程度及/或长度等，进一步调控光程较长及光程较短的光线的出光位置、出光角度及光线分配比例，以满足后续不同应用层面的显示面板所需的规格。具体而言，如图5所示，导光板500定义具有长度方向L2，长度方向L2垂直于导光板500的入光面503的延伸方向。为了清楚说明起见，将导光微结构520沿着长度方向L2另行标号，即将其依序标为导光微结构520a、导光微结构520b与导光微结构520c。导光微结构520a的第一反射面521a与第二反射面521b分别在长度方向L2上具有投影长度a1与投影长度b1， 且投影长度b1与投影长度a1的比值为P1。相似地，导光微结构520b的第一反射面521a与第二反射面521b分别在长度方向L2上具有投影长度a2与投影长度b2，且投影长度b2与投影长度a2的比值为P2。导光微结构520c的第一反射面521a与第二反射面521b分别在长度方向L2上具有投影长度a3与投影长度b3，且投影长度b3与投影长度a3的比值为P3。
在本实施方式中，远离入光面503的导光微结构520c的比值P3小于邻近入光面503的导光微结构520c的比值P2。也就是说，导光微结构520a、导光微结构520b与导光微结构520c的第一反射面521a在长度方向L2上的投影长度随着远离入光面503而渐增，而导光微结构520a、导光微结构520b与导光微结构520c的第二反射面521b在长度方向L2上的投影长度随着远离入光面503而渐减，使得P1>P2>P3。具体而言，邻近入光面503的导光微结构520a的第一反射面521a在长度方向L2的投影长度a1较短且面积较小，故可降低全反射的比例，减少长光程的光线；邻近入光面503的导光微结构520a的第二反射面521b的投影长度b1较长且面积较大，故可增加从此处射出导光板500的光线比例，增加短光程的光线，因此可在靠近入光面503的区域提供较高比例的光程较短的光线，进一步改善靠近入光面503的区域出现暗带的情况。另一方面，由于导光板500远离入光面503的位置已不需要再利用短光程的光线来改善暗带，因此，可将导光微结构520设计成以长光程的光线产出为主，使得导光微结构520c的第二反射面521b的投影长度b3较短、面积较小，而导光微结构520的第一反射面521a的投影长度a3较长、面积较大，以符合导光板500远离入光面503的位置的出光需求。
在图5的实施例中，导光微结构520a、导光微结构520b与导光微结构520c的比值P1、P2、P3亦可根据需求而设计成相等。借此，光程较长及光程较短的光线沿着长度方向L2的分配比例固定，使导光板500的模具易于制作，这有利于降低生产成本。
另请参照图6，其是绘示依照本揭露的一实施方式的显示装置的装置示意图。本实施方式的显示装置600包含如图1所示的背光模组100以及显示面板610、至少一个膜片620、以及反射片370。如图6所示，膜片620 设置在背光模组100的导光板300的前方(出光侧)，反射片370则设置在背光模组100的导光板300的后方，显示面板610设置在膜片620的出光侧。借此，显示装置600借助于导光板300上的条状微结构350以及导光微结构360的设计，同样可达到调整导光板300的光线的行径方向与出光方向，进而达到控制出光视角的目的。其中，本案实施例以图1所示的背光模组100应用于显示装置600中仅用来示范说明，并非限制本发明。前述其他实施例的导光板(例如导光板400或导光板500)均可应用于显示装置中，以产生同样的效果。
由上述本揭露实施方式可知，本揭露通过具有双侧面与作用面的条状微结构来改变光线在导光板中的行径路径，并结合导光微结构来调配光线的出光位置与出光量，故可达到调整出光视角与提升整体出光均匀度的目的。
虽然本揭露的实施例已揭露如上，然其并非用以限定本揭露，任何所属技术领域人员，在不脱离本揭露的实施例的精神和范围内，应当可以做出些许更动与润饰，故本揭露的实施例的保护范围应当以所附的权利要求书所界定的保护范围为准。
【附图标记列表】
100：背光模组
200：光源
300：导光板
310：出光面
320：底面
330：入光面
340：反入光面
350：条状微结构
351：侧面
352：侧面
353：作用面
360：导光微结构
361：迎光面
362：反迎光面
370：反射片
400：导光板
401：入光面
402：反入光面
410：条状微结构
420：导光微结构
500：导光板
501：底面
502：出光面
503：入光面
510：条状微结构
520：导光微结构
520a：导光微结构
520b：导光微结构
520c：导光微结构
521：迎光面
521a：第一反射面
521b：第二反射面
522：反迎光面
600：显示装置
610：显示面板
620：膜片
a1：投影长度
b1：投影长度
a2：投影长度
b2：投影长度
a3：投影长度
b3：投影长度
B1：光线
B2：光线
B3：光线
B4：光线
D1：距离
D2：宽度
L1：长度方向
L2：长度方向
T1：厚度方向
W1：宽度
W2：宽度
W3：宽度
W4：宽度
θ1：夹角
θ2：夹角。

Claims (16)

  1. 一种导光板，用以与光源耦合，其中，所述导光板包含：
    出光面；
    底面，其与所述出光面相对；
    入光面，其连接于所述出光面及所述底面之间，所述光源所射出的光线经由所述入光面进入到所述导光板；
    多个条状微结构，其设置于所述出光面及所述底面中的至少一者上，其中每一所条状微结构具有相对的两个侧面以及作用面，其中所述两个侧面分别连接于所述作用面的相对两个侧边，其中所述导光板具有厚度方向，所述两个侧面均相对于所述作用面倾斜，且所述两个侧面分别与所述厚度方向之间具有夹角；以及
    多个导光微结构，其设置在任意两个相邻的所述条状微结构之间，且沿着每一所述条状微结构的延伸方向排列。
  2. 根据权利要求1所述的导光板，其中，每一所述条状微结构的所述两个侧面未与所述作用面连接的边缘之间的距离大于所述作用面的宽度。
  3. 根据权利要求1所述的导光板，其中，
    所述导光板具有与所述入光面相对的反入光面；
    每一所述条状微结构具有第一部分、第二部分与第三部分，其中所述第一部分具有第一宽度且靠近所述入光面，所述第二部分具有第二宽度且靠近所述反入光面，所述第三部分位于所述第一部分与所述第二部分之间且具有第三宽度；以及
    所述第三宽度大于所述第一宽度，且所述第一宽度大于所述第二宽度。
  4. 根据权利要求1所述的导光板，其中，每一所述导光微结构包含互相连接的迎光面以及反迎光面，其中所述迎光面的倾斜程度小于所述反迎光面的倾斜程度。
  5. 根据权利要求4所述的导光板，其中，
    所述迎光面包含彼此相连的第一反射面以及第二反射面，其中所述第一反射面的倾斜程度小于所述第二反射面的倾斜程度；以及
    所述第一反射面及所述第二反射面的其中一者连接于所述反迎光面。
  6. 根据权利要求5所述的导光板，其中，所述导光板具有长度方向，所述长度方向垂直于所述入光面，其中每一所述导光微结构具有比值，所述比值为所述第二反射面在所述长度方向上的投影长度除以所述第一反射面在所述长度方向上的投影长度，而且远离所述入光面的所述导光微结构的所述比值小于邻近所述入光面的所述导光微结构的所述比值。
  7. 一种导光板，用以与光源耦合，其中，所述导光板包含：
    出光面；
    底面，其与所述出光面相对；
    入光面，其连接于所述出光面及所述底面之间，所述光源所射出的光线经由所述入光面进入到所述导光板；
    多个条状微结构，其设置于所述出光面及所述底面中的至少一者上；以及
    多个导光微结构，其设置在任意两个相邻的所述条状微结构之间，且沿着每一所述条状微结构的延伸方向排列；
    其中，多个所述导光微结构的排列密度是所述导光板的折射率的增函数。
  8. 根据权利要求7所述的导光板，其中，每一所述条状微结构具有相对的两个侧面以及作用面，其中所述两个侧面分别连接于所述作用面的相对两个侧边，其中所述导光板具有厚度方向，所述两个侧面均相对于所述作用面倾斜，且所述两个侧面分别与所述厚度方向之间具有夹角。
  9. 根据权利要求8所述的导光板，其中，每一所述条状微结构的所述两个侧面未与所述作用面连接的边缘之间的距离大于所述作用面的宽度。
  10. 根据权利要求8所述的导光板，其中，
    所述导光板具有与所述入光面相对的反入光面；
    每一所述条状微结构具有第一部分、第二部分与第三部分，其中所述第一部分具有第一宽度且靠近所述入光面，所述第二部分具有第二宽度且靠近所述反入光面，所述第三部分位于所述第一部分与所述第二部分之间且具有第三宽度；以及
    所述第三宽度大于所述第一宽度，且所述第一宽度大于所述第二宽度。
  11. 根据权利要求8所述的导光板，其中，每一所述导光微结构包含互相连接的迎光面以及反迎光面，其中所述迎光面的倾斜程度小于所述反迎光面的倾斜程度。
  12. 根据权利要求11所述的导光板，其中，
    所述迎光面包含彼此相连的第一反射面以及第二反射面，其中所述第一反射面的倾斜程度小于所述第二反射面的倾斜程度；以及
    所述第一反射面及所述第二反射面的其中一者连接于所述反迎光面。
  13. 根据权利要求12所述的导光板，其中，所述导光板具有长度方向，所述长度方向垂直于所述入光面，其中每一所述导光微结构具有比值，所述比值为所述第二反射面在所述长度方向上的投影长度除以所述第一反射面在所述长度方向上的投影长度，而且远离所述入光面的所述导光微结构的所述比值小于邻近所述入光面的所述导光微结构的所述比值。
  14. 一种背光模组，包含：
    根据权利要求1至13中任一项所述的导光板；以及
    光源，其邻设于所述入光面。
  15. 根据权利要求14所述的背光模组，还包含设置在所述导光板上方的至少一个棱镜片，其中所述棱镜片具有多个棱镜结构，且每一所述棱镜结构的延伸方向平行于所述入光面。
  16. 一种显示装置，包含：
    根据权利要求14或15所述的背光模组；以及
    显示面板，其设置在所述背光模组上方。
PCT/CN2021/131127 2020-11-19 2021-11-17 导光板、背光模组及显示装置 WO2022105777A1 (zh)

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