CN108845386B - Light guide plate, manufacturing method thereof and backlight source - Google Patents
Light guide plate, manufacturing method thereof and backlight source Download PDFInfo
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- CN108845386B CN108845386B CN201810907039.XA CN201810907039A CN108845386B CN 108845386 B CN108845386 B CN 108845386B CN 201810907039 A CN201810907039 A CN 201810907039A CN 108845386 B CN108845386 B CN 108845386B
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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
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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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
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
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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
- G02B6/0065—Manufacturing aspects; Material aspects
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- 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
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- 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
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a light guide plate, a manufacturing method thereof and a backlight source, and belongs to the field of manufacturing of liquid crystal displays. The light guide plate includes: the light guide plate comprises a light guide plate body, wherein a prism structure is arranged on a first surface of the light guide plate body; a light adjusting structure is arranged on the second surface of the light guide plate body and is configured to transmit the light with the first wavelength and reflect the light with the second wavelength; wherein, the target surface that the light guide plate body was kept away from to the structure of adjusting luminance is provided with the site structure on, and the target surface is last: when the total reflection angle of the first wavelength light is larger than that of the second wavelength light, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is smaller than that of the mesh point structures close to the light incident side of the light guide plate body; when the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is larger than that of the mesh point structures close to the light incident side of the light guide plate body. The invention improves the chromaticity uniformity of the side-in backlight source.
Description
Technical Field
The invention relates to the field of manufacturing of liquid crystal displays, in particular to a light guide plate, a manufacturing method thereof and a backlight source.
Background
When the liquid crystal display displays images, light needs to be provided through a backlight source, and the backlight source is divided into an edge type backlight source and a direct type backlight source, wherein a light source of the edge type backlight source is arranged on the side surface of a light guide plate, the brightness of the backlight source can be adjusted through a Local dimming technology, and the Local dimming technology refers to a technology for dividing the displayed images into a plurality of areas and adjusting the brightness of each area.
The current local dimming technology utilizes a collimation light guide plate to realize the local dimming of the lateral incident backlight source. The collimation light guide plate is a light guide plate with a fine prism structure formed on a light-emitting surface of a common light guide plate by a photoetching technology.
The common light guide plate converts a line light source entering from the side into a uniform surface light source through the waveguide action, and the waveguide action is formed on the premise of total reflection in the light guide plate. The collimating light guide plate has a fine prism structure on the light-emitting surface, so that the total internal reflection is affected, and the probability that blue light is reflected and diffused out of the light guide plate is higher because the total reflection angle of the blue light is smaller than that of red light, so that one side of the collimating light guide plate close to the light source emits blue, and the other side of the collimating light guide plate far away from the light emitter emits red, and thus, the chromaticity of the lateral backlight source is uneven.
Disclosure of Invention
The embodiment of the invention provides a light guide plate, a manufacturing method thereof and a backlight source, which realize the improvement of the chromaticity uniformity of a lateral entrance type backlight source, and the technical scheme is as follows:
in a first aspect, a light guide plate is provided, including:
the light guide plate comprises a light guide plate body, wherein a prism structure is arranged on a first surface of the light guide plate body;
a light adjusting structure is arranged on a second surface of the light guide plate body, the light adjusting structure is configured to transmit light of a first wavelength and reflect light of a second wavelength, the first surface and the second surface are opposite to each other, and the light of the first wavelength and the light of the second wavelength are respectively one of red light and blue light;
wherein, the structure of adjusting luminance is kept away from be provided with the site structure on the target surface of light guide plate body, just on the target surface:
when the total reflection angle of the light with the first wavelength is greater than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is less than that of the mesh point structures close to the light incident side of the light guide plate body;
when the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is larger than that of the mesh point structures close to the light incident side of the light guide plate body.
Optionally, the light guide plate further includes:
the light guide plate comprises a light guide plate body, a light dimming structure and a transparent light guide layer, wherein the light dimming structure is arranged on the light guide plate body, the transparent light guide layer is arranged on the second surface of the light guide plate body, the transparent light guide layer is positioned between the light guide plate body and the light dimming structure, and the refractive index.
Optionally, the transparent optical waveguide layer orientation be provided with the site structure on the one side of structure of adjusting luminance transparent optical waveguide layer orientation on the one side of structure of adjusting luminance, the site structure is along keeping away from the direction of light guide plate income light side, distribution density crescent.
Optionally, the transparent optical waveguide layer and the prism structure are both made of ultraviolet glue or thermosetting glue.
Optionally, when the total reflection angle of the light with the first wavelength is greater than the total reflection angle of the light with the second wavelength, the distribution density of the dot structures is gradually reduced along a direction away from the light incident side of the light guide plate on the target surface;
when the total reflection angle of the first wavelength light is smaller than that of the second wavelength light, the distribution density of the mesh point structures is gradually increased along the direction far away from the light incident side of the light guide plate on the target surface.
Optionally, the light modulation structure includes a first light modulation layer and a second light modulation layer stacked in a staggered manner, where refractive indexes of the first light modulation layer and the second light modulation layer are both greater than 1, the refractive index of the first light modulation layer is smaller than the refractive index of the second light modulation layer, and a layer of the light modulation structure closest to the light guide plate body is the first light modulation layer.
Optionally, the first dimming layer is made of magnesium fluoride, and the second dimming layer is made of niobium pentoxide.
In a second aspect, a backlight is provided, which includes a light source and a light guide plate, where the light source is located on a side surface of the light guide plate, and the light guide plate is any one of the light guide plates of the first aspect.
In a third aspect, a method for manufacturing a light guide plate is provided, including:
forming a prism structure on a first surface of the light guide plate body;
forming a light modulation structure on a second surface of the light guide plate body, the light modulation structure being configured to emit light of a first wavelength and reflect light of a second wavelength, the first surface and the second surface being opposite surfaces of the light guide plate body, the light of the first wavelength and the light of the second wavelength being one of red light and blue light, respectively;
forming a dot structure on a target surface of the dimming structure far away from the light guide plate body;
when the total reflection angle of the light with the first wavelength is greater than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is less than that of the mesh point structures close to the light incident side of the light guide plate body;
when the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is larger than that of the mesh point structures close to the light incident side of the light guide plate body.
Optionally, before forming the dimming structure on the second surface of the light guide plate body, the method further includes:
forming a transparent optical waveguide layer on a second surface of the light guide plate body;
form the structure of adjusting luminance on the second face of light guide plate body includes:
and forming the dimming structure on the transparent optical waveguide layer, wherein the transparent optical waveguide layer and the prism structure are made of the same material.
In the light guide plate, the manufacturing method thereof and the backlight source provided by the embodiment of the invention, when the total reflection angle of the light with the first wavelength is greater than the total reflection angle of the light with the second wavelength, that is, the light with the first wavelength is red light, and the light with the second wavelength is blue light, because the dimming structure is configured to transmit red light and reflect blue light, the red light enters the light of the light guide plate body, the red light is transmitted to the dot structure by the dimming structure and is reflected to the light guide plate body by the dot structure, the blue light is directly reflected to the light guide plate body by the dimming structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is less than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability of the red light being reflected by the dot structure far away from the light incident side of the light guide plate body is less than that of the dot structure, and the blue light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light-emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
When the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, that is, the light with the first wavelength is blue light, and the light with the second wavelength is red light, because the dimming structure is configured to transmit the blue light and reflect the red light, and the blue light enters the light of the light guide plate body, the blue light is transmitted to the dot structure by the dimming structure and is reflected to the light guide plate body by the dot structure, the red light is directly reflected to the light guide plate body by the dimming structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is greater than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability that the blue light is reflected by the dot structure far away from the light incident side of the light guide plate body is greater than that the dot structure near the light incident side of the light guide plate body, and, and the red light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a light guide plate according to an embodiment of the present invention.
Fig. 2 is a schematic view of an optical path of a conventional collimating light guide plate.
Fig. 3 is a schematic view of an optical path of a light guide plate according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a light guide plate according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a dimming structure according to an embodiment of the present invention.
Fig. 6 is a flowchart of a method for manufacturing a light guide plate according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
An embodiment of the present invention provides a light guide plate, as shown in fig. 1, where fig. 1 is a schematic structural diagram of the light guide plate provided in the embodiment of the present invention, and the light guide plate includes:
the light guide plate comprises a light guide plate body 1, wherein a prism structure 11 is arranged on a first surface of the light guide plate body 1. The prism structure 11 can perform area dimming of the edge-lit backlight.
A light adjusting structure 12 is disposed on a second surface of the light guide plate body 1, the light adjusting structure being configured to transmit light of a first wavelength and reflect light of a second wavelength, the first surface and the second surface being opposite to each other, and the light of the first wavelength and the light of the second wavelength being one of red light and blue light, respectively.
Wherein, the target surface of the light adjusting structure 12 far away from the light guide plate body 1 is provided with a dot structure 13, and on the target surface:
when the total reflection angle of the light with the first wavelength is greater than the total reflection angle of the light with the second wavelength, that is, the light with the first wavelength is red light, and the light with the second wavelength is blue light, the distribution density of the dot structures 13 far away from the light incident side of the light guide plate body 1 is less than the distribution density of the dot structures 13 near the light incident side of the light guide plate body 1;
when the total reflection angle of the light with the first wavelength is smaller than the total reflection angle of the light with the second wavelength, that is, the light with the first wavelength is blue light, and the light with the second wavelength is red light, the distribution density of the dot structures 13 far away from the light incident side of the light guide plate body 1 is greater than the distribution density of the dot structures 13 near the light incident side of the light guide plate body 1.
Optionally, the light guide plate body 1 may be made of an organic material, or may be a glass light guide plate, which is not limited in the embodiment of the present invention.
It should be noted that the first surface and the second surface are two opposite surfaces of the light guide plate body 1, wherein the first surface is a light exit surface of the light guide plate body 1, the light source is disposed on a side surface of the light guide plate body 1, the linear light source enters from the side surface of the light guide plate body 1, and is converted into a uniform surface light source by the waveguide effect of the light guide plate body 1, and is scattered out from the light exit surface of the light guide plate body 1, and the light entrance side of the light guide plate refers to a side of the light guide plate close to the.
Referring to fig. 2, fig. 2 is a schematic diagram of an optical path of a conventional collimating light guide plate, which includes: the light guide plate comprises a light guide plate body 0 and a prism structure 01 arranged on the light emergent surface of the light guide plate body 0, and a dot structure 02 is arranged on the surface of the light guide plate body 0 opposite to the light emergent surface. In fig. 2, the thick line represents the blue light, the thin line represents the red light, wherein the dotted line represents the light that is not totally reflected, the collimation light guide plate has a fine prism structure on the light emitting surface, the total internal reflection is affected, the probability that the blue light a is reflected and diffused out of the light guide plate body 0 is higher because the total reflection angle is smaller than that of the red light b, so that the side of the collimation light guide plate close to the light source is bluish, and the side far away from the illuminant is reddish.
Referring to fig. 3, fig. 3 is a schematic optical path diagram of a light guide plate according to an embodiment of the present invention, and fig. 3 illustrates an example that a total reflection angle of light of a first wavelength is greater than a total reflection angle of light of a second wavelength, where the light of the first wavelength is red light and the light of the second wavelength is blue light, a thick line in fig. 3 represents blue light, a thin line represents red light, and a dotted line represents light that is not totally reflected, because the dimming structure 12 is configured to transmit red light and reflect blue light, among the light entering the light guide plate body 1, the red light b is transmitted to the dot structure 13 by the dimming structure and is reflected back to the light guide plate body 1 by the dot structure 13, the blue light a is directly reflected back to the light guide plate body 1 by the dimming structure 12, and on a target surface, a distribution density of the dot structure 13 far away from a light incident side of the light guide plate body 1 is less, accordingly, the probability that the red light is reflected by the dot structure 13 far away from the light incident side of the light guide plate body 1 is smaller than the probability that the red light is reflected by the dot structure 13 near the light incident side of the light guide plate body 1, and the red light in the light adjusted by the dimming structure 12 and the dot structure 13 is more concentrated on the side near the light source and neutralized with the blue light, so that the phenomenon that the side near the light source is bluish and the side far away from the light emitting body is reddish is reduced, and therefore, the chromaticity uniformity of the side-entrance type backlight is improved.
Further, as shown in fig. 1, the distribution density of the dot structures 13 on the target surface of the light guide plate body 1 is gradually decreased along a direction away from the light incident side of the light guide plate body. Therefore, the probability of the red light reflected by the dot structure 13 is gradually reduced along the direction far away from the light incident side of the light guide plate body, so that the neutralization effect of the red light and the blue light is better.
When the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, that is, the light with the first wavelength is blue light, and the light with the second wavelength is red light, because the dimming structure is configured to transmit the blue light and reflect the red light, and the blue light enters the light of the light guide plate body, the blue light is transmitted to the dot structure by the dimming structure and is reflected to the light guide plate body by the dot structure, the red light is directly reflected to the light guide plate body by the dimming structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is greater than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability that the blue light is reflected by the dot structure far away from the light incident side of the light guide plate body is greater than that the dot structure near the light incident side of the light guide plate body, and, and the red light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
Furthermore, the distribution density of the mesh point structures is gradually increased along the direction far away from the light incident side of the light guide plate body on the target surface of the light guide plate body. The probability that the blue light is reflected by the dot structure is gradually increased along the direction far away from the light incident side of the light guide plate body, so that the neutralization effect of the blue light and the red light is better.
Optionally, the distribution density of the dot structures 13 may be gradually decreased or increased from the light incident side close to the light guide plate to the light incident side far from the light guide plate according to a fixed value. It should be noted that the distribution density variation of the dot structure 13 may also be varied in other ways, and during actual manufacturing, the distribution density of the dot structure 13 may be simulated by simulation software according to the chromaticity distribution characteristics of the light guide plate to be formed, so as to determine the distribution density that is finally needed to be used, and the distribution density of the dot structure 13 is set based on the distribution density obtained by simulation, which is not limited in the embodiment of the present invention.
Optionally, as shown in fig. 4, fig. 4 is a schematic structural diagram of a light guide plate provided in an embodiment of the present invention, where the light guide plate may further include: and a transparent optical waveguide layer 2 disposed on a second surface of the light guide plate body 1, wherein the transparent optical waveguide layer 2 is disposed between the light guide plate body 1 and the light control structure 12, and the transparent optical waveguide layer 2 has the same refractive index as the prism structure 11.
In general, the transparent optical waveguide layer 2 is made of the same material as the prism structure 11. Illustratively, the transparent optical waveguide layer 2 and the prism structure 11 are made of uv glue or thermosetting glue. Of course, the transparent optical waveguide layer 2 and the prism structure 11 may be made of other materials, which is not limited in the present invention.
Optionally, the material of the transparent optical waveguide layer 2 and the material of the prism structure 11 may also be different, as long as the refractive indexes of the transparent optical waveguide layer 2 and the prism structure 11 are the same, which is not limited in the present invention.
The transparent optical waveguide layer 2 has the same refractive index as the prism structure 11, so that the light source has the same optical waveguide propagation effect on the second surface and the first surface of the light guide plate body 1, and symmetric optical waveguides on both surfaces of the light guide plate body 1 are realized, thereby effectively transmitting light from the light guide plate body 1 to the dimming structure.
As shown in fig. 4, a dot structure 14 is disposed on a surface of the transparent optical waveguide layer 2 facing the light adjusting structure 12, and the dot structure 14 is gradually increased in distribution density in a direction away from the light incident side of the light guide plate on the surface of the transparent optical waveguide layer 2 facing the light adjusting structure 12. By providing the dot structure 14, the light propagating in the transparent optical waveguide layer 2 can be homogenized, so that the light is uniformly transmitted to the light adjusting structure 12.
The shapes of the dot structures 13 and 14 can be various, for example, the dot structures 13 and 14 can be groove-shaped structures, and the size of the dot structures ranges from 0.1 mm to 1 mm; the optical grating structure may also be a specific grating structure, a circular ink structure, a volcano-vent-shaped structure carved by laser, or the like, which is not limited in the embodiment of the present invention.
For example, as shown in fig. 5, fig. 5 is a schematic structural diagram of the light adjusting structure 12, where the light adjusting structure 12 includes a first light adjusting layer 121 and a second light adjusting layer 122 stacked in an interleaving manner, where refractive indexes of the first light adjusting layer 121 and the second light adjusting layer 122 are both greater than 1, the refractive index of the first light adjusting layer 121 is smaller than that of the second light adjusting layer 122, and a layer of the light adjusting structure 12 closest to the light guide plate body 1 is the first light adjusting layer 121. The second light modulation layer 122 is provided with the dot structures 13, and fig. 5 illustrates an example in which the total reflection angle of the light with the first wavelength is greater than that of the light with the second wavelength, where the light with the first wavelength is red light and the light with the second wavelength is blue light, and on the target surface, the distribution density of the dot structures 13 far away from the light incident side of the light guide plate is less than that of the dot structures 13 near the light incident side of the light guide plate.
Optionally, the dimming structure 12 may have multiple dimming layers, where the number of the dimming layers is positively correlated to the final dimming effect, that is, the more the dimming layers are, the better the dimming effect is, for example, when the dimming structure is configured to transmit red light and reflect blue light, the more the dimming layers are, the more red light and the reflected blue light are transmitted; when the dimming structure is configured to transmit blue light and reflect red light, the more dimming layers, the more blue light and reflected red light it transmits. The multilayer dimming layer may comprise an even layer or an odd layer of dimming layers, such as: the first dimming layer 121, the second dimming layer 122 and the first dimming layer 121 may be included, or the first dimming layer 121, the second dimming layer 122, the first dimming layer 121 and the second dimming layer 122 may be included, as long as the first dimming layer 121 and the second dimming layer 122 of the dimming structure 12 are ensured to be alternately stacked, which is not limited in the embodiment of the present invention.
It should be noted that the function of the dimming structure can be realized by adjusting the thickness of each dimming layer. For example, in the case that the total number of dimming layers and the sequence of the dimming layers are not changed, the thickness of each dimming layer can be changed to make the final dimming structure function as transmitting red light and reflecting blue light, or transmitting blue light and reflecting red light. The thickness of each dimming layer can be simulated by simulation software.
The first light modulation layer 121 may be made of magnesium fluoride, and the second light modulation layer 122 may be made of niobium pentoxide, where the refractive index of the magnesium fluoride is 1.38, and the refractive index of the niobium pentoxide is about 2.1-2.3. Of course, the first light modulation layer 121 and the second light modulation layer 122 may also be made of other materials, as long as it can be ensured that the refractive indexes of the first light modulation layer 121 and the second light modulation layer 122 are both greater than 1, and the refractive index of the first light modulation layer 121 is smaller than the refractive index of the second light modulation layer 122, so as to achieve transmission of red light and reflection of blue light, which is not limited in the embodiment of the present invention.
It should be noted that a surface of all the film layers in the dimming structure 12, which is away from the light guide plate body, is a plane to ensure effective propagation of light in each film layer, for example, a surface of the first dimming layer 121, which is close to the second dimming layer 122, is a plane.
To sum up, in the light guide plate provided in the embodiments of the present invention, when the total reflection angle of the light with the first wavelength is greater than the total reflection angle of the light with the second wavelength, that is, the light with the first wavelength is red light, and the light with the second wavelength is blue light, because the light adjusting structure is configured to transmit red light and reflect blue light, and enter the light of the light guide plate body, the red light is transmitted to the dot structure by the light adjusting structure and is reflected back to the light guide plate body by the dot structure, and the blue light is directly reflected back to the light guide plate body by the light adjusting structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is smaller than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability of the red light being reflected by the dot structure far away from the light incident side of the light guide plate body is smaller than that of the, and the blue light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light-emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
When the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, that is, the light with the first wavelength is blue light, and the light with the second wavelength is red light, because the dimming structure is configured to transmit the blue light and reflect the red light, and the blue light enters the light of the light guide plate body, the blue light is transmitted to the dot structure by the dimming structure and is reflected to the light guide plate body by the dot structure, the red light is directly reflected to the light guide plate body by the dimming structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is greater than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability that the blue light is reflected by the dot structure far away from the light incident side of the light guide plate body is greater than that the dot structure near the light incident side of the light guide plate body, and, and the red light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
An embodiment of the present invention provides a backlight, which includes a light source and a light guide plate, where the light source is located on a side surface of the light guide plate, and the light guide plate is the light guide plate in any one of the above embodiments of the present invention.
Optionally, the light source includes a plurality of light emitting units arranged in an array to form a line light source. For example, the light emitting unit may be a light emitting diode, or may be another light emitting body, which is not limited in the embodiment of the present invention.
To sum up, the backlight source provided in the embodiments of the present invention includes a light source and a light guide plate, when the total reflection angle of light with a first wavelength is greater than the total reflection angle of light with a second wavelength, that is, the light with the first wavelength is red light, and the light with the second wavelength is blue light, because the light adjusting structure is configured to transmit red light and reflect blue light, and enter the light of the light guide plate body, the red light is transmitted to the dot structure by the light adjusting structure and is reflected back to the light guide plate body by the dot structure, the blue light is directly reflected back to the light guide plate body by the light adjusting structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is less than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability of the red light being reflected by the dot structure, the red light in the light adjusted by the dimming structure and the dot structure is more concentrated on one side close to the light source and neutralized with the blue light, so that the phenomenon that one side close to the light source is bluish and the other side far away from the light-emitting body is reddish is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
When the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, that is, the light with the first wavelength is blue light, and the light with the second wavelength is red light, because the dimming structure is configured to transmit the blue light and reflect the red light, and the blue light enters the light of the light guide plate body, the blue light is transmitted to the dot structure by the dimming structure and is reflected to the light guide plate body by the dot structure, the red light is directly reflected to the light guide plate body by the dimming structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is greater than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability that the blue light is reflected by the dot structure far away from the light incident side of the light guide plate body is greater than that the dot structure near the light incident side of the light guide plate body, and, and the red light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
As shown in fig. 6, an embodiment of the present invention provides a method for manufacturing a light guide plate, including:
Optionally, a light guide plate body is provided, and the light guide plate body is of a plate-shaped structure, and the structure of the light guide plate body can refer to a conventional light guide plate. Then, a prism structure is formed on the first surface of the light guide plate body, and there are various ways for forming the prism structure, and the following ways are taken as examples for the embodiment of the present invention:
in the first method, the prism structure is formed on the light guide plate body by means of attaching, transferring or imprinting.
In a second way, the prism structure is formed by a photolithography process. For example, assuming that the prism structure is made of an ultraviolet glue or a thermosetting glue, the ultraviolet glue or the thermosetting glue is formed on the light guide plate body by coating, and the ultraviolet glue or the thermosetting glue is exposed and developed to obtain the prism structure.
And 320, forming a dot structure with gradually increased distribution density along the direction far away from the light incident side of the light guide plate on one surface of the transparent light guide layer facing the dimming structure.
The above-mentioned methods for forming the dot structure can be various, and the embodiments of the present invention are described in the following ways:
the first mode is as follows: a dot structure is formed on the transparent optical waveguide layer by a laser engraving process.
The second mode is as follows: a dot structure is formed on the transparent optical waveguide layer by an etching process.
The first surface and the second surface are opposite surfaces of the light guide plate body.
The transparent optical waveguide layer and the prism structure are both made of ultraviolet glue or thermosetting glue. Ultraviolet glue or thermosetting glue can be formed on the light guide plate body in a coating mode to obtain the transparent light guide layer.
And a step 340 of forming a dimming structure on the transparent optical waveguide layer, wherein the transparent optical waveguide layer is made of the same material as the prism structure, the dimming structure is configured to transmit light of a first wavelength and reflect light of a second wavelength, the first surface and the second surface are opposite surfaces of the light guide plate body, and the light of the first wavelength and the light of the second wavelength are respectively one of red light and blue light.
Alternatively, the dimming structure may be formed on the transparent optical waveguide layer by coating, deposition or sputtering, or may be formed in other manners, which is not limited in the embodiment of the present invention.
Further, the dimming structure includes a first dimming layer and a second dimming layer stacked in a staggered manner, wherein the refractive indexes of the first dimming layer and the second dimming layer are both greater than 1, the refractive index of the first dimming layer is smaller than the refractive index of the second dimming layer, and the layer of the dimming structure closest to the light guide plate body is the first dimming layer. Wherein the first light modulation layer is made of magnesium fluoride, and the second light modulation layer is made of niobium pentoxide.
And 350, forming a dot structure on the target surface of the dimming structure far away from the light guide plate body.
When the total reflection angle of the light with the first wavelength is larger than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is smaller than that of the mesh point structures close to the light incident side of the light guide plate body.
Optionally, the distribution density of the dot structures is gradually decreased along a direction away from the light incident side of the method on the target surface.
When the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is greater than that of the mesh point structures close to the light incident side of the light guide plate body.
Optionally, the distribution density of the dot structures is gradually increased along a direction away from the light incident side of the method on the target surface.
It should be noted that, the sequence of the steps of the method for manufacturing a light guide plate according to the embodiment of the present invention may be appropriately adjusted, and the steps may be increased or decreased according to the circumstances, and any method that can be easily conceived by a person skilled in the art within the technical scope of the present invention shall be included in the protection scope of the present invention, and therefore, the details are not described again.
To sum up, in the method for manufacturing a light guide plate according to the embodiments of the present invention, when the total reflection angle of the light with the first wavelength is greater than the total reflection angle of the light with the second wavelength, that is, the light with the first wavelength is red light, and the light with the second wavelength is blue light, because the light adjusting structure is configured to transmit red light and reflect blue light, and enter the light of the light guide plate body, the red light is transmitted to the dot structure by the light adjusting structure and is reflected back to the light guide plate body by the dot structure, the blue light is directly reflected back to the light guide plate body by the light adjusting structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is smaller than the distribution density of the dot structure near the light incident side of the light guide plate body, accordingly, the probability of the red light being reflected by the dot structure far away from the light incident side of the light guide plate body is smaller than the, and the blue light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light-emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
When the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, that is, the light with the first wavelength is blue light, and the light with the second wavelength is red light, because the dimming structure is configured to transmit the blue light and reflect the red light, and the blue light enters the light of the light guide plate body, the blue light is transmitted to the dot structure by the dimming structure and is reflected to the light guide plate body by the dot structure, the red light is directly reflected to the light guide plate body by the dimming structure, and on the target surface, the distribution density of the dot structure far away from the light incident side of the light guide plate body is greater than that of the dot structure near the light incident side of the light guide plate body, accordingly, the probability that the blue light is reflected by the dot structure far away from the light incident side of the light guide plate body is greater than that the dot structure near the light incident side of the light guide plate body, and, and the red light is neutralized, so that the phenomenon that one side close to the light source is blue and the other side far away from the light emitting body is red is reduced, and the chromaticity uniformity of the side-in backlight source is improved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the units in the foregoing embodiment of the apparatus may be referred to in the foregoing method embodiments, and are not described herein again.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A light guide plate, comprising:
the light guide plate comprises a light guide plate body, wherein a prism structure is arranged on a first surface of the light guide plate body;
a light adjusting structure is arranged on a second surface of the light guide plate body, the light adjusting structure is configured to transmit light of a first wavelength and reflect light of a second wavelength, the first surface and the second surface are opposite to each other, and the light of the first wavelength and the light of the second wavelength are respectively one of red light and blue light;
wherein, the structure of adjusting luminance is kept away from be provided with the site structure on the target surface of light guide plate body, just on the target surface:
when the total reflection angle of the light with the first wavelength is greater than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is less than that of the mesh point structures close to the light incident side of the light guide plate body;
when the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is larger than that of the mesh point structures close to the light incident side of the light guide plate body.
2. The light guide plate according to claim 1, further comprising:
the light guide plate comprises a light guide plate body, a light dimming structure and a transparent light guide layer, wherein the light dimming structure is arranged on the light guide plate body, the transparent light guide layer is arranged on the second surface of the light guide plate body, the transparent light guide layer is positioned between the light guide plate body and the light dimming structure, and the refractive index.
3. The light guide plate according to claim 2, wherein a mesh point structure is disposed on a surface of the transparent light guide layer facing the light adjusting structure, and a distribution density of the mesh point structure disposed on the transparent light guide layer is gradually increased along a direction away from a light incident side of the light guide plate on the surface of the transparent light guide layer facing the light adjusting structure.
4. The light guide plate according to claim 2, wherein the transparent light guiding layer and the prism structure are made of uv glue or thermosetting glue.
5. The light guide plate according to claim 1, wherein when the total reflection angle of the light with the first wavelength is greater than the total reflection angle of the light with the second wavelength, the distribution density of the dot structures on the target surface is gradually decreased in a direction away from the light incident side of the light guide plate;
when the total reflection angle of the first wavelength light is smaller than that of the second wavelength light, the distribution density of the mesh point structures is gradually increased along the direction far away from the light incident side of the light guide plate on the target surface.
6. The light guide plate according to any one of claims 1 to 5,
the light adjusting structure comprises a first light adjusting layer and a second light adjusting layer which are arranged in a staggered and stacked mode, wherein the refractive indexes of the first light adjusting layer and the second light adjusting layer are both larger than 1, the refractive index of the first light adjusting layer is smaller than that of the second light adjusting layer, and the layer, closest to the light guide plate body, of the light adjusting structure is the first light adjusting layer.
7. The light guide plate according to claim 6,
the first light modulation layer is made of magnesium fluoride, and the second light modulation layer is made of niobium pentoxide.
8. A backlight, comprising a light source and a light guide plate, wherein the light source is located on a side surface of the light guide plate, and the light guide plate is the light guide plate according to any one of claims 1 to 7.
9. A method for manufacturing a light guide plate, comprising:
forming a prism structure on a first surface of the light guide plate body;
forming a light adjusting structure on a second surface of the light guide plate body, the light adjusting structure being configured to transmit light of a first wavelength and reflect light of a second wavelength, the first surface and the second surface being opposite surfaces of the light guide plate body, the light of the first wavelength and the light of the second wavelength being one of red light and blue light, respectively;
forming a dot structure on a target surface of the dimming structure far away from the light guide plate body;
when the total reflection angle of the light with the first wavelength is greater than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is less than that of the mesh point structures close to the light incident side of the light guide plate body;
when the total reflection angle of the light with the first wavelength is smaller than that of the light with the second wavelength, the distribution density of the mesh point structures far away from the light incident side of the light guide plate body is larger than that of the mesh point structures close to the light incident side of the light guide plate body.
10. The method of claim 9,
before forming the dimming structure on the second surface of the light guide plate body, the method further includes:
forming a transparent optical waveguide layer on a second surface of the light guide plate body;
form the structure of adjusting luminance on the second face of light guide plate body includes:
and forming the dimming structure on the transparent optical waveguide layer, wherein the transparent optical waveguide layer and the prism structure are made of the same material.
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| CN109387900A (en) * | 2018-11-27 | 2019-02-26 | 深圳市隆利科技股份有限公司 | Light guide plate, backlight module and the liquid crystal display device of adjustable emergent light angle |
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| CN1700067A (en) * | 2004-05-19 | 2005-11-23 | 索尼株式会社 | Backlight apparatus and liquid crystal display apparatus |
| CN203731207U (en) * | 2014-01-07 | 2014-07-23 | 南京中科神光科技有限公司 | Light source module for display unit |
| CN107327747A (en) * | 2017-06-26 | 2017-11-07 | 青岛海信电器股份有限公司 | A kind of backlight module and display device |
| CN206618877U (en) * | 2017-03-07 | 2017-11-07 | 深圳市高美福电子有限公司 | A kind of light guide plate side patch |
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| JP6277065B2 (en) * | 2014-05-30 | 2018-02-07 | 富士フイルム株式会社 | Backlight unit and liquid crystal display device |
| JP5959575B2 (en) * | 2014-06-30 | 2016-08-02 | ミネベア株式会社 | Planar illumination device and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700067A (en) * | 2004-05-19 | 2005-11-23 | 索尼株式会社 | Backlight apparatus and liquid crystal display apparatus |
| CN203731207U (en) * | 2014-01-07 | 2014-07-23 | 南京中科神光科技有限公司 | Light source module for display unit |
| CN206618877U (en) * | 2017-03-07 | 2017-11-07 | 深圳市高美福电子有限公司 | A kind of light guide plate side patch |
| CN107327747A (en) * | 2017-06-26 | 2017-11-07 | 青岛海信电器股份有限公司 | A kind of backlight module and display device |
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