WO2022193834A1 - Structure de source de rétroéclairage - Google Patents

Structure de source de rétroéclairage Download PDF

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Publication number
WO2022193834A1
WO2022193834A1 PCT/CN2022/073004 CN2022073004W WO2022193834A1 WO 2022193834 A1 WO2022193834 A1 WO 2022193834A1 CN 2022073004 W CN2022073004 W CN 2022073004W WO 2022193834 A1 WO2022193834 A1 WO 2022193834A1
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WO
WIPO (PCT)
Prior art keywords
light
microstructure
guide plate
angle
backlight structure
Prior art date
Application number
PCT/CN2022/073004
Other languages
English (en)
Chinese (zh)
Inventor
马骏
薛九枝
Original Assignee
江苏集萃智能液晶科技有限公司
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Publication of WO2022193834A1 publication Critical patent/WO2022193834A1/fr

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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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • 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
    • 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
    • G02B6/0051—Diffusing 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

Definitions

  • the present invention relates to the technical field of liquid crystal display backlight sources, in particular to a backlight source structure.
  • Backlight is an important component used in display and lighting fields, and it plays the role of forming a uniform surface light source.
  • the traditional backlight structure usually adds dots or grooves on the surface of the light guide plate to destroy the waveguide propagation of light, diffuses the light emitted from the light guide plate through the diffusion film, and then contracts the light through the brightness enhancement film.
  • the final outgoing light angle of the traditional backlight source is usually within ⁇ 35° perpendicular to the light outgoing surface.
  • the traditional backlight source has a large light angle due to the diffusion effect of the diffuser, and the brightness is limited in the front view direction.
  • the present application mainly solves the problems of large light angle in the design of the backlight structure and limited brightness in the front view direction, and provides a backlight structure.
  • the present application provides a backlight structure, which includes: a lighting assembly;
  • the light-emitting surfaces are vertical and adjacent, the light-incident surface is located on the side close to the lighting assembly, the light-reflecting surface and the light-exiting surface are positioned opposite to each other, and the light-reflecting surface is provided with a first surface microstructure,
  • the contact angle between the tangent of any point on the surface of the first surface microstructure and the reflective surface is not greater than 9°
  • the light incident surface is set to have a second surface microstructure, and the surface of the second surface microstructure has any contact angle.
  • the angle between the tangent of a point and the light incident surface is 30° to 70°
  • the light exit surface is set to have a third surface microstructure, and the tangent of any point on the surface of the third surface microstructure is related to the incident light.
  • the included angle of the surface is not more than 70°, and the light exit angle of the light guide plate is between 65° and 90°; the light adjustment film is located on the side of the light exit surface of the light guide plate, and the light adjustment film is located on the light exit surface side of the light guide plate.
  • the dimming film includes a base material layer and a microstructure layer, the microstructure layer is a triangular prism strip extending in a direction parallel to the light incident surface and arranged intermittently or continuously; a reflective sheet, the reflective sheet is located in the one side of the reflective surface of the light guide plate.
  • the first surface microstructure is a plurality of convex or concave dot microstructures.
  • the dot microstructure is a pyramid structure, a pyramid structure or a cambered structure.
  • the arc structure is one of a partial sphere, an ellipsoid or an elliptical paraboloid, and the projection of the arc structure on the reflective surface is a circle or an ellipse.
  • the second surface microstructure and/or the third surface microstructure is an outwardly convex or inwardly concave strip-like structure.
  • the angle between the tangent of any point on the surface of the strip structure and the light incident surface or the light exit surface is 30° ⁇ 70°.
  • the strip structure is one or more of prism strips, cylindrical strips or trapezoidal strips.
  • the spacing between adjacent strip structures is 30 ⁇ m ⁇ 140 ⁇ m.
  • the triangular prism strip is located on the side away from the light-emitting surface of the light guide plate, and the bottom angle A of the triangular prism strip on the side close to the light-incident surface is 86°-90°, away from the
  • the bottom angle B of the triangular prism strip on the light incident surface side is 66° ⁇ 74°, and the bottom width L of the triangular prism strip is 6 ⁇ m ⁇ 25 ⁇ m.
  • the triangular prism strip is located on the side close to the light exit surface of the light guide plate, and the bottom angle C of the triangular prism strip on the side close to the light incident surface is 30°-80°, far from the
  • the bottom angle D of the triangular prism strip on the light incident surface side is 30° ⁇ 80°
  • the bottom width P of the triangular prism strip is 5 ⁇ m ⁇ 35 ⁇ m.
  • the microstructure layer is prepared from a resin material with a refractive index between 1.45 and 1.7.
  • it also includes an improved layer of doped scattering particles fixed to the side of the light-adjusting film facing away from the light guide plate.
  • the scattering particles are distributed in the hot spot area M of the improvement layer close to the light incident surface.
  • the scattering particles are distributed throughout the improvement layer, and the scattering particles are in the improvement layer from a side close to the light incident surface to a side away from the light incident surface
  • the distribution density gradually decreases.
  • a dimming element is further provided on the side of the dimming film facing away from the light guide plate.
  • the dimming element includes a base material and a dopant material, and the dopant material rotates in the base material when electrified.
  • the refractive index difference between the refractive index n1 of the base material and the refractive index n2 of the doping material is between 0.3 and 3.
  • the doping material is composed of rod-shaped molecules.
  • the width of the rod-shaped molecule is between 50nm and 1000nm, and the length of the rod-shaped molecule is between 500nm and 50um.
  • the beneficial effect of the present application is that, compared with the traditional backlight structure, the backlight structure designed in the present application not only reduces the large-angle light and improves the utilization rate of the backlight, but also reduces the light exit angle, which improves the efficiency of the backlight. Brightness; in addition, the backlight structure designed in the present application also avoids the problem of hot spots or uneven light and dark optical defects caused by the lighting components on the light incident surface.
  • FIG. 1 is a schematic three-dimensional structural diagram of a backlight structure according to an embodiment
  • FIG. 2 is a front view of a backlight structure of an embodiment
  • Fig. 3 is the front view of the light guide plate structure
  • Fig. 5 is the left side view of the light guide plate structure
  • Figure 6 is a diagram of the type of stripes in the second surface microstructure and/or the third surface microstructure
  • FIG. 7 is a schematic view of the angle of strip-like structures in the second surface microstructure and/or the third surface microstructure
  • FIG. 8 is a front view of the structure of the dimming film according to an embodiment
  • FIG. 9 is a schematic diagram of light correction of a dimming film structure according to an embodiment.
  • FIG. 10 is a front view of another embodiment of the dimming film structure
  • FIG. 11 is a schematic diagram of light correction of the structure of the dimming film according to another embodiment.
  • FIG. 12 is a schematic structural diagram of a composite light-adjusting film
  • FIG. 14 is another embodiment of the improved layer doping particle distribution in the composite dimming film
  • 15 is a front view of a backlight structure of another embodiment
  • FIG. 16 is a schematic structural diagram of a dimming element
  • 17 is a top view of the molecular state of the dopant material in the wide viewing angle dimming element
  • Lighting assembly In the figure: 1. Lighting assembly; 2. Reflective sheet; 3. Light guide plate; 4. Light adjustment film; 5. Light adjustment element; 31, First surface microstructure; Surface microstructure; 41, base material layer; 42, microstructure layer; 43, improvement layer; 51, basic material; 52, doping material.
  • the embodiment of the present application provides a backlight structure, which includes an illumination assembly 1, a light guide plate 3, a light adjustment The film 4 and the reflection sheet 2 located on the side of the light-reflecting surface of the light guide plate 3 .
  • the lighting assembly 1 is further preferably an LED light source;
  • the light guide plate 3 has a light incident surface, a light exit surface and a light reflection surface, the light entrance surface is perpendicular to and adjacent to the light exit surface, and the light entrance surface is located at the Close to one side of the lighting assembly 1 , the reflective surface and the light-emitting surface are located opposite to each other, and the reflective surface is provided with a first surface microstructure 31 , any point on the surface of the first surface microstructure 31
  • the contact angle between the tangent of the reflective surface and the reflective surface is not greater than 9°, the light incident surface is set to have a second surface microstructure 32, and the tangent of any point on the surface of the second surface microstructure 32 is related to the light incident surface.
  • the included angle is 30°-70°
  • the light-emitting surface is set to have a third surface microstructure 33, and the angle between the tangent at any point on the surface of the third surface microstructure 33 and the light-incident surface is not greater than 70° °
  • the structural design of the light guide plate above makes the light exit angle of the light guide plate 3 between 65° and 90°
  • the light adjustment film 4 is located on the side of the light exit surface of the light guide plate 3
  • 4 includes a base material layer 41 and a microstructure layer 42, the microstructure layer 42 has triangular prism strips extending in a direction parallel to the light incident surface and arranged intermittently.
  • the cross-sectional structure of the triangular prism strip is an isosceles triangle or a non-isosceles triangle, and the function of the light-adjusting film 4 is mainly to correct the light emitted from the light guide plate 3.
  • the microstructure layer 42 is made of a resin material with a refractive index between 1.45 and 1.7.
  • the backlight structure prepared from the light guide plate 3 and the dimming film 4 designed by the above structure can correct the angle of the light coming out of the backlight structure to be within the range of ⁇ 15° perpendicular to the light emitting surface, and at the same time reduce the large-angle light, so that the More light is gathered in a small light output range, improving the brightness of the backlight.
  • the first surface microstructure 31 is a plurality of convex or concave dot microstructures.
  • the dot microstructure is a pyramid structure, a pyramid structure or a cambered structure.
  • the arc structure is one of a partial sphere, an ellipsoid or an elliptical paraboloid, and the projection of the arc structure on the reflective surface is a circle or an ellipse.
  • the second surface microstructures 32 and/or the third surface microstructures 33 are strip-like structures that are convex or concave.
  • the angle between the tangent line at any point on the surface of the strip structure and the light incident surface or the light exit surface is 30° ⁇ 70°.
  • the strip structure is one or more of prism strips, cylindrical strips or trapezoidal strips.
  • the spacing between adjacent strip structures is 30 ⁇ m ⁇ 140 ⁇ m.
  • the triangular prism strip is located on the side away from the light-emitting surface of the light guide plate 3, and the bottom angle A of the triangular prism strip on the side close to the light-incident surface is 86°-90° , the bottom angle B of the triangular prism strip on the side away from the light incident surface is 66° ⁇ 74°, and the bottom width L of the triangular prism strip is 6 ⁇ m ⁇ 25 ⁇ m; the triangular prism strip is located close to the light guide plate 3 On the side of the light-emitting surface, the base angle C of the triangular prism strip on the side close to the light-incident surface is 30° ⁇ 80°, and the base angle D of the triangular prism strip on the side away from the light-incident surface is 30° ⁇ 80° °, the bottom width P of the triangular prism strip is 5 ⁇ m ⁇ 35 ⁇ m.
  • the present application also includes an improvement layer 43 doped with scattering particles fixed to the side of the light-adjusting film 4 away from the light guide plate 3 .
  • the scattering particles are distributed in the hot spot area M of the improvement layer 43 close to the light incident surface; the scattering particles are distributed throughout the improvement layer 43, and The distribution density of the scattering particles in the improvement layer 43 decreases gradually from the side of the light incident surface to the side away from the light incident surface.
  • a light-adjusting element 5 is further provided on the side of the light-adjusting film 4 away from the light guide plate 3 .
  • the main purpose of the dimming element 5 is to perform secondary processing on the light exiting through the dimming film 4 ⁇ 15°, so as to increase the brightness and adjust the viewing angle range at the same time.
  • the dimming element 5 includes a base material 51 and a dopant material 52, and the dopant material 52 rotates in the base material 51 when electrified.
  • the refractive index difference between the refractive index n1 of the base material and the refractive index n2 of the doping material 52 is between 0.3 and 3.
  • the doping material 52 is composed of rod-shaped molecules, and the length of the rod-shaped molecules is at least 10 times longer than the width. Further preferably, the width of the rod-shaped molecule is between 50nm and 1000nm, and the length of the rod-shaped molecule is between 500nm and 50um.
  • the backlight structure consists of an LED light source assembly, a bottom reflective sheet 2, a light guide plate 3 and a light adjustment film 4; the bottom reflective sheet 2 will be directed to the bottom The light reflected back into the light guide plate 3 improves the utilization rate of light; the light guide plate 3 can form a uniform surface light source for the light propagated by the waveguide;
  • the structure of the light guide plate 3 is shown in FIG. 3 , the light guide plate 3 has a light-reflecting surface, a light-incident surface, and a light-exiting surface; the first surface microstructure is formed on the light-reflecting surface through processes such as collision points and precision machining. 31;
  • the first surface microstructure 31 can be but not limited to concave or convex pyramids, arcs and other structures; its main feature is that the tangent of each point on the first surface microstructure 31 is the same as the horizontal direction The angle is less than 9°.
  • a second surface microstructure 32 is provided on the light incident surface of the light guide plate 3 on the side close to the LED light source.
  • the arrangement of the second surface microstructure 32 is shown in FIGS. 4 and 5 .
  • the second surface microstructure 32 is a convex or concave strip structure, which can be, but not limited to, prism strips, cylindrical strips, trapezoidal strips and other structures, as shown in FIG. 6 .
  • the extending direction of the strip-like structures of the second surface microstructures 32 is the Y-direction arrangement in FIG. 5
  • the arrangement direction of the strip-like structures of the second surface microstructures 32 is the Z-direction in FIG.
  • the spacing between adjacent strip structures in the surface microstructures 32 is 30um-140um, and adjacent strip structures can also be arranged next to each other; the tangent of any point on any strip structure on the second surface microstructure 32
  • the angle ⁇ with the horizontal plane is 30° to 70°, and the schematic diagram of the angle identification is shown in FIG. 7 .
  • a third surface microstructure 33 is further provided on the light exit surface of the light guide plate 3 , and the arrangement of the third surface microstructure 33 is shown in FIGS. 4 and 5 , and the third surface microstructure 33 may be
  • the strip-like structure is convex or concave, the strip-like structure can be but not limited to prism strips, cylindrical strips, etc., as shown in FIG. 6 .
  • the extending direction of the strip-like structures of the third surface microstructures 33 is the X-direction arrangement in FIG. 4
  • the arrangement direction of the strip-like structures of the third surface microstructures 33 is the Z-direction in FIG.
  • the spacing between adjacent strip-shaped structures in the microstructure 33 is 30um to 140um, and adjacent strip-shaped structures can also be arranged next to each other; the tangent of any point on any strip-shaped structure on the third surface microstructure 33 and The angle of the horizontal plane is not greater than 70°. In this embodiment, the angle between the tangent of any point on any strip-like structure on the third surface microstructure 33 and the horizontal plane is 30° ⁇ 70°.
  • the continuous change of the structure surface may also be a single fixed angle, or the case of intermittent change or irregular change, which is not repeated here, and the angle identification is schematically shown in FIG.
  • the light emitted from the LEDs passes through the light guide plate 3 to form 65° ⁇ 90° ° narrow angle light output range.
  • a light adjustment film 4 is also provided above the light guide plate 3 , and the function of the light adjustment film 4 is mainly to correct the light emitted by the light guide plate 3 .
  • the dimming film 4 includes a base material layer 41 and a microstructure layer 42. As shown in FIG. 8 and FIG. 10 , the microstructure layer 42 is arranged in triangular prism strips, and the extension direction of the triangle is the Z direction. The arrangement direction is the X direction, and the microstructure layer 42 is prepared from a resin material with a refractive index between 1.45 and 1.7.
  • FIG. 8 is a schematic structural diagram of an embodiment of the dimming film 4 .
  • the microstructure layer 42 is arranged in non-isosceles triangle prism strips.
  • FIG. 9 The cross-sectional structure of the microstructure layer 42 is shown in FIG. 9 .
  • the base angle A of the prism strip on the light incident side is 86° ⁇ 90°
  • the base angle B of the prism strip on the side away from the light incident surface is 66° ⁇ 74°
  • the bottom width L of the non-isosceles triangle is 6um ⁇ 25um.
  • FIG. 10 is a schematic structural diagram of another embodiment of the light-adjusting film 4 .
  • the microstructure layer 42 is arranged in isosceles triangle or non-isosceles triangle prism strips.
  • the cross-sectional structure of the microstructure layer 42 is shown in FIG. 11 .
  • the bottom angle C of the prism strip on the light incident side near the light guide plate 3 is 30°-80°
  • the bottom angle D of the prism strip on the side away from the light incident surface is 30° ⁇ 80°
  • the bottom width P of the prism strip structure is 5um ⁇ 35um .
  • the dimming film 4 composed of the base material layer 41 and the microstructure layer 42 can reduce the large-angle light, correct the light exit angle of the light guide plate 3 to within the range of ⁇ 15° perpendicular to the light exit surface, and improve the frontal brightness of the backlight source.
  • the principle structure of light correction is shown in Figure 9 and Figure 11.
  • an improvement layer 43 is also provided above the light-adjusting film 4 , as shown in FIG. 12 .
  • the improvement layer 43 the light emitted from the hot spot region M is homogenized by doping the scattering particles.
  • the distribution of doping examples is shown in Figures 13 and 14.
  • the doped particles are only distributed in the hot spot area M close to the light incident side. The particle density on the side is higher, and the particle density on the side away from the incident light is lower.
  • the composite dimming film 4 composed of the dimming film 4 and the improvement layer 43 can effectively improve the common hot spot problem on the light incident side.
  • the basic design of the backlight structure in this embodiment is as described in Embodiment 1.
  • This embodiment is only improved on the basis of Embodiment 1, that is, a dimming element 5 is further provided above the dimming film 4, such as shown in Figure 15.
  • the structure of the dimming element 5 is shown in FIG. 16 , and the dimming element 5 includes a base material 51 and a doping material 52 .
  • the doping material 52 is composed of rod-shaped molecules
  • the molecular width is between 50nm and 1000nm
  • the molecular length is between 500nm and 50um
  • the molecular length is 3 times to 50 times the molecular width.
  • the molecular length is At least 10 times the width of the molecule.
  • the refractive index difference between the refractive index n1 of the base material 51 and the refractive index n2 of the doping material 52 is between 0.3 and 3.
  • the dopant material 52 can rotate within the base material 51 under a voltage. Under the same doping density, when the doping molecules are in the state 1 of FIG. 17 and the state 2 of FIG. 18 respectively, their effect on the light is different, thus forming different dimming to the outgoing light of the dimming film 4 effect, forming different light-emitting angles.
  • the optical element 5 can adjust the light output with a wide viewing angle and a narrow viewing angle, wherein: Figure 17 is a top view of the molecular state of the doping material in the wide viewing angle dimming element 5, and Figure 18 is a narrow viewing angle dimming
  • the top view of the molecular state of the dopant material in the element 5, the strength of the adjustment effect can be controlled by voltage.
  • the present application has designed a backlight structure.
  • the dot structure on the light guide plate 3 has no strong scattering of light, so there is no bright light related to the dot structure in the direction perpendicular to the light emitting surface. Spots or poor visibility, which are visible in the conventional light guide plate 3 .
  • the light-emitting angle of the backlight structure is also reduced, which improves brightness and privacy protection, and reduces product power consumption.

Abstract

L'invention concerne une structure de source de rétroéclairage comprenant : un ensemble d'éclairage (1), une plaque de guidage de lumière (3), un film de gradation (4), et une feuille de réflexion de lumière (2) située sur un côté d'une surface de réflexion de lumière de la plaque de guidage de lumière (3). La plaque de guidage de lumière (3) a une surface d'incidence de lumière, une surface de sortie de lumière et la surface de réflexion de lumière ; un angle de contact entre une ligne tangente d'un point quelconque sur la surface d'une première microstructure de surface (31) sur la surface de réflexion de lumière et la surface de réflexion de lumière n'est pas supérieure à 9° ; un angle inclus entre une ligne tangente d'un point quelconque sur la surface d'une deuxième microstructure de surface (32) sur la surface d'incidence de lumière et la surface d'incidence de lumière est de 30 à 70° ; un angle inclus entre une ligne tangente d'un point quelconque sur la surface d'une troisième microstructure de surface (33) sur la surface de sortie de lumière et la surface d'incidence de lumière n'est pas supérieure à 70°. Le film de gradation (4) situé sur un côté de la surface de sortie de lumière de la plaque de guidage de lumière (3) comprend une couche de substrat (41) et une couche de microstructure (42), et la couche de microstructure (42) a des bandes de prisme triangulaire s'étendant le long de la direction parallèle à la surface d'incidence de lumière et agencées de façon intermittente ou continue. Ainsi, une lumière à grand angle et un angle de sortie de lumière sont réduits, et le taux d'utilisation et la luminosité d'une source de rétroéclairage sont améliorés.
PCT/CN2022/073004 2021-03-17 2022-01-20 Structure de source de rétroéclairage WO2022193834A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110286344.3 2021-03-17
CN202110286344.3A CN112882148A (zh) 2021-03-17 2021-03-17 一种背光源结构

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CN112882148A (zh) * 2021-03-17 2021-06-01 江苏集萃智能液晶科技有限公司 一种背光源结构

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JP2004069879A (ja) * 2002-08-05 2004-03-04 Hitachi Ltd 液晶表示装置
CN1996059A (zh) * 2006-01-06 2007-07-11 清华大学 导光板及使用该导光板的背光模块
CN202813042U (zh) * 2011-07-25 2013-03-20 美蓓亚株式会社 面状照明装置
CN107065060A (zh) * 2016-12-30 2017-08-18 苏州维旺科技有限公司 一种具有齿形入光面的导光板
CN110082853A (zh) * 2018-01-26 2019-08-02 光耀科技股份有限公司 导光膜及具有该导光膜的背光模块
CN212341509U (zh) * 2020-06-15 2021-01-12 江苏集萃智能液晶科技有限公司 一种导光板及背光源结构
CN112882148A (zh) * 2021-03-17 2021-06-01 江苏集萃智能液晶科技有限公司 一种背光源结构

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Publication number Priority date Publication date Assignee Title
JP2004069879A (ja) * 2002-08-05 2004-03-04 Hitachi Ltd 液晶表示装置
CN1996059A (zh) * 2006-01-06 2007-07-11 清华大学 导光板及使用该导光板的背光模块
CN202813042U (zh) * 2011-07-25 2013-03-20 美蓓亚株式会社 面状照明装置
CN107065060A (zh) * 2016-12-30 2017-08-18 苏州维旺科技有限公司 一种具有齿形入光面的导光板
CN110082853A (zh) * 2018-01-26 2019-08-02 光耀科技股份有限公司 导光膜及具有该导光膜的背光模块
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CN112882148A (zh) * 2021-03-17 2021-06-01 江苏集萃智能液晶科技有限公司 一种背光源结构

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