CN110308512B - Backlight module, display device and manufacturing method of light guide plate - Google Patents
Backlight module, display device and manufacturing method of light guide plate Download PDFInfo
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- CN110308512B CN110308512B CN201910694719.2A CN201910694719A CN110308512B CN 110308512 B CN110308512 B CN 110308512B CN 201910694719 A CN201910694719 A CN 201910694719A CN 110308512 B CN110308512 B CN 110308512B
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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
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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
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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Abstract
The application discloses backlight unit, display device and light guide plate's manufacturing method, this backlight unit includes: a first dielectric layer having a plurality of first optical structures; the second medium layer is positioned on the first medium layer and is provided with a plurality of second optical structures; the first light source is used for providing first incident light, the first incident light is converted into first emergent light by the light guide surfaces of the first optical structures, and the first emergent light is emitted to the light emitting side of the backlight module through the first medium layer and the second medium layer in sequence; and the second light source is used for providing second incident light, the second incident light is converted into second emergent light by the light guide surfaces of the second optical structures, and the second emergent light is emitted out to the light emitting side of the backlight module through the second medium layer, wherein the radian of the light guide surface of the first optical structure, which faces the first light source, is larger than the radian of the light guide surface of the second optical structure, which faces the second light source, so that the emergent angle range of the first emergent light is larger than the emergent angle range of the second light.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a display device and a manufacturing method of a light guide plate.
Background
A Liquid Crystal Display (LCD) has advantages of good picture quality, small size, light weight, low driving voltage, low power consumption, no radiation, and relatively low manufacturing cost, and is dominant in the field of flat panel displays.
With the continuous progress of liquid crystal display technology, the viewing angle of the display can be switched between wide and narrow viewing angles. People can effectively protect business confidentiality and personal privacy while enjoying visual experience brought by a large visual angle so as to avoid screen information leakage.
In the prior art, a CBL backlight module is used to control a wide and narrow viewing angle of the backlight module by controlling an orderly/disordered arrangement of Polymer Dispersed Liquid Crystal (PDLC) molecules, so as to realize switching of the wide and narrow viewing angles.
However, the prior art has the following problems:
1. when the PDLC is arranged in disorder, the emergent light with wide visual angle is emitted from the display module, the display of the display module is in a wide visual angle state, but because of the characteristics of the CBL backlight module, the directivity of the emergent light is higher, the emergent angle of the emergent light with wide visual angle is reduced compared with the common backlight, and the wide visual angle image display is poor.
2. When the switching of the wide and narrow viewing angles is controlled by controlling the ordered/disordered arrangement of liquid crystal molecules in the PDLC, the PDLC has the problem of liquid leakage caused by poor sealing in the actual production and use processes, so that the function of the PDLC is invalid, and the switching of the wide and narrow viewing angles cannot be well realized.
Disclosure of Invention
The invention provides a backlight module, a display device and a manufacturing method of a light guide plate aiming at the problems in the prior art, and achieves the purpose of switching wide and narrow visual angles by controlling the emergent angle of emergent light.
According to a first aspect of the embodiments of the present invention, there is provided a backlight module, including: a first dielectric layer having a plurality of first optical structures; the second medium layer is positioned on the first medium layer and is provided with a plurality of second optical structures; the first light source is used for providing first incident light, the first incident light is converted into first emergent light by the light guide surfaces of the first optical structures, and the first emergent light is emitted to the light emitting side of the backlight module through the first medium layer and the second medium layer in sequence; and the second light source is used for providing second incident light, the second incident light is converted into second emergent light by the light guide surfaces of the second optical structures, the second emergent light passes through the second medium layer and is emitted out from the light emitting side of the backlight module, wherein the light guide surface of the first optical structure faces towards the convex radian of the first light source is larger than the light guide surface of the second optical structure faces towards the convex radian of the second light source.
Preferably, the first medium layer includes a first end portion adjacent to the first light source, and a height of the first end portion gradually decreases in a direction from a side close to the first light source to a side far from the first light source; the second medium layer comprises a second end part, the second end part is adjacent to the second light source, and the height of the second end part is gradually reduced in the direction from the side close to the second light source to the side far away from the second light source.
Preferably, the first dielectric layer further includes a first extension portion connected to the first end portion, the plurality of first optical structures are distributed on a lower surface of the first extension portion, and the plurality of second optical structures are distributed on an upper surface of the first extension portion; the second dielectric layer further includes a second extension portion covering the upper surface of the first extension portion and the plurality of second optical structures, and connected to the second end portion.
Preferably, the second end portion is located on a side of the first extension portion away from the first light source.
Preferably, the cross sections of the first end portion and the second end portion are in a right trapezoid shape, the cross sections of the first extension portion and the second extension portion are in a rectangular shape, the plane where the right-angle side of the first end portion is located and the lower surface of the first extension portion are located on the same plane, and the plane where the right-angle side of the second end portion is located and the upper surface of the second extension portion are located on the same plane.
Preferably, the refractive index of the second medium layer is greater than that of the first medium layer, so that a total reflection surface is formed on the contact surface of the two medium layers and the first medium layer.
Preferably, the lighting device further comprises a control module electrically connected to the first light source and the second light source respectively, and configured to gate one of the first light source and the second light source according to a mode signal.
According to a second aspect of the embodiments of the present invention, there is provided a display device, including the backlight module as described above.
According to a third aspect of the embodiments of the present invention, a method for manufacturing a light guide plate is provided, including forming a second medium layer on a first medium layer, where the first medium layer has a plurality of first optical structures, and the second medium layer has a plurality of second optical structures, where a radian of a light guide surface of the first optical structure protruding toward a first light source is greater than a radian of a light guide surface of the second optical structure protruding toward the second light source, and the first optical structure and the second optical structure are formed by using an injection molding process.
Preferably, the material of the first dielectric layer comprises optical glass, and the material of the second dielectric layer comprises polycarbonate material.
According to the backlight module and the display device provided by the embodiment of the invention, the first incident light provided by the first light source is converted into the first emergent light through the light guide surfaces of the plurality of first optical structures, so that the first emergent light is emitted to the light emitting side of the backlight module through the first medium layer and the second medium layer in sequence, the second incident light provided by the second light source is converted into the second emergent light through the light guide surfaces of the plurality of second optical structures, so that the second emergent light is emitted to the light emitting side of the backlight module through the second medium layer, the radian of the light guide surface of the first optical structure protruding towards the first light source is larger than the radian of the light guide surface of the second optical structure protruding towards the second light source, the emergent angle range of the first emergent light is larger than the emergent angle range of the second light, namely the first emergent light is wide in visual angle, and the second emergent light is narrow in visual angle. Compared with the prior art, the wide and narrow visual angle switching of the backlight module and the display device is not controlled by the PDLC any more, but directly switches the wide and narrow visual angle by controlling the emergent angle range of emergent light of the backlight module, and further, in a wide visual angle mode, because the light is emitted after being converted by the first optical structure without being controlled by the PDLC any more, the display effect is better when the wide visual angle is displayed.
According to the manufacturing method of the light guide plate provided by the embodiment of the invention, the first optical structure and the second optical structure formed by the injection molding process have better reliability in controlling wide and narrow viewing angle switching compared with PDLC.
Furthermore, the refractive index of the second medium layer is greater than that of the first medium layer, so that a total reflection surface is formed on the contact surface of the second medium layer and the first medium layer, and second incident light provided by the second light source cannot enter the first medium layer, so that the second incident light is prevented from being influenced by the first optical structure, and the light emitting effect in the narrow viewing angle mode is further improved.
Drawings
The above and other object features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural view showing a display device according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of a portion of the backlight module shown in FIG. 1;
fig. 3 and 4 are schematic diagrams illustrating the principle of switching between wide and narrow viewing angles according to an embodiment of the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. In addition, certain well known components may not be shown.
Numerous specific details of the invention are set forth in the following description in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
Fig. 1 shows a schematic structural diagram of a display device according to an embodiment of the invention, fig. 2 shows an enlarged structural diagram of a portion of a backlight module in fig. 1, and as shown in fig. 1 and fig. 2, the display device according to the embodiment of the invention includes a display panel 100 and a backlight module. The backlight module is located below the display panel 100, and includes a reflector 210, a first dielectric layer 220, a second dielectric layer 230, a diffuser 250, a lower light enhancement film 260, and an upper light enhancement film 270 stacked in sequence from bottom to top, and further includes a first light source 241 for providing first incident light, a second light source 242 for providing second incident light, and a control module (not shown), where the control module is electrically connected to the first light source 241 and the second light source 242, respectively, and is configured to gate one of the first light source 241 and the second light source 242 according to a mode signal.
In this embodiment, the first medium layer 220 has a plurality of first optical structures 201, the second medium layer 230 is located on the first medium layer 220 and has a plurality of second optical structures 202, and the first medium layer 220 and the second medium layer 230 form a light guide plate, wherein the radian of the light guide surface of the first optical structure 201 protruding toward the first light source 241 is greater than the radian of the light guide surface of the second optical structure 202 protruding toward the second light source 242.
The first dielectric layer 220 includes a first end 221 and a first extension 222 connected thereto. The first end portion 221 is adjacent to the first light source 241, and the height of the first end portion 221 gradually decreases in a direction from a side close to the first light source 241 to a side far from the first light source 241. The plurality of first optical structures 201 are distributed on the lower surface of the first extension portion 222, and the plurality of second optical structures 202 are distributed on the upper surface of the first extension portion 222.
The second dielectric layer 230 includes a second end 231 and a second extension 232 connected thereto. The second end 231 is adjacent to the second light source 242, the height of the second end 231 is gradually reduced in a direction from a side close to the second light source 242 to a side far from the second light source 242, and the second end 231 is located at a side of the first extending portion 222 far from the first light source 241. The second extension 232 covers the upper surface of the first extension 222 and the plurality of second optical structures 202.
In this embodiment, the cross sections of the first end portion 221 and the second end portion 231 are in a right trapezoid shape, the cross sections of the first extending portion 222 and the second extending portion 232 are in a rectangular shape, the plane where the right-angled side of the first end portion 221 is located and the lower surface of the first extending portion 222 are located on the same plane, and the plane where the right-angled side of the second end portion 231 is located and the upper surface of the second extending portion 232 are located on the same plane.
However, the display device according to the embodiment of the invention is not limited thereto, and those skilled in the art may make other arrangements on the shapes of the first end portion 221, the second end portion 231, the first extending portion 222, and the second extending portion 232 as needed.
In this embodiment, the refractive index of the second dielectric layer 230 is greater than that of the first dielectric layer 220, so that the contact surface between the second dielectric layer 230 and the first dielectric layer 220 forms a total reflection surface.
In some embodiments, the material of the first dielectric layer 220 includes optical glass BK-7, the melting point of the optical glass BK-7 is 557 ℃ and the refractive index is 1.51. The material of the second dielectric layer 230 includes a polycarbonate material having a melting point of 270 ℃ and a refractive index of 1.59.
However, the display device according to the embodiment of the invention is not limited thereto, and those skilled in the art may make other arrangements on the materials of the first dielectric layer 220 and the second dielectric layer 230 as needed.
In the embodiment, the lower brightness enhancement film 260 and the upper brightness enhancement film 270 are sawtooth prisms, both having a light-gathering effect within a certain angle, and the diffusion sheet 250 is used to widen the viewing angle.
The method for manufacturing the light guide plate according to the present invention will be described in detail with reference to fig. 2.
A first optical structure 201 is formed on the lower surface of the first dielectric layer 220 by a first re-injection molding process, wherein the first optical structure 201 is arranged by a conventional dot design.
Further, a second optical structure 202 is formed on the upper surface of the first medium 220 layer by a second overmolding process, wherein the second optical structure 202 is designed and arranged by high-directivity transfer dots, so that the radian of the light guide surface of the first optical structure 201 protruding towards the first light source 241 is greater than the radian of the light guide surface of the second optical structure 202 protruding towards the second light source 242.
Further, after the first dielectric layer 220 is cooled to a certain temperature, a second dielectric layer 230 covering the upper surface of the first dielectric layer 220 and the second optical structure 202 is formed by an injection molding process.
In the embodiment of the invention, the material of the first dielectric layer 220 comprises optical glass BK-7, the melting point of the optical glass BK-7 is 557 ℃ and the refractive index is 1.51, the material of the second dielectric layer 230 comprises a polycarbonate material, and the melting point of the polycarbonate material is 270 ℃ and the refractive index is 1.59.
Because the melting point of the first dielectric layer 220 is much higher than the melting point of the second dielectric layer 230, after the first dielectric layer 220 is formed, the temperature is reduced to 270 ℃ to form the second dielectric layer 230, and the temperature is lower than the melting point of the optical glass BK-7, so that the second optical structure 202 cannot be damaged.
The refractive index of the second dielectric layer 230 is set to be higher than that of the first dielectric layer 220, so that the contact surface of the second dielectric layer 230 and the first dielectric layer 220 forms a total reflection surface.
Fig. 3 and 4 are schematic diagrams illustrating the principle of switching wide and narrow viewing angles according to an embodiment of the present invention, and the principle of switching wide and narrow viewing angles of the display device according to the present invention will be described in detail with reference to fig. 3 and 4.
As shown in fig. 3, when the control module gates the first light source 241 according to the mode signal, the first light source 241 provides first incident light, the first incident light is converted into first emergent light by the light guide surfaces of the plurality of first optical structures 201, and the first emergent light sequentially passes through the first dielectric layer 220 and the second dielectric layer 230 and is emitted to the light emitting side of the backlight module.
As shown in fig. 4, when the control module gates the second light source 242 according to the mode signal, the second light source 242 provides a second incident light, the second incident light is converted into a second emergent light by the light guide surfaces of the plurality of second optical structures 202, and the second emergent light is emitted to the light emitting side of the backlight module through the second dielectric layer 230, because the second optical structures 202 are arranged in a high-directivity transfer dot design, the emergent angle of the second emergent light is small and is an emergent light with a narrow viewing angle, and because the contact surface of the second dielectric layer 230 and the first dielectric layer 220 forms a total reflection surface, the second incident light is not affected by the first optical structure 201.
According to the backlight module and the display device provided by the embodiment of the invention, the first incident light provided by the first light source is converted into the first emergent light through the light guide surfaces of the plurality of first optical structures, so that the first emergent light is emitted to the light emitting side of the backlight module through the first medium layer and the second medium layer in sequence, the second incident light provided by the second light source is converted into the second emergent light through the light guide surfaces of the plurality of second optical structures, so that the second emergent light is emitted to the light emitting side of the backlight module through the second medium layer, the radian of the light guide surface of the first optical structure protruding towards the first light source is larger than the radian of the light guide surface of the second optical structure protruding towards the second light source, the emergent angle range of the first emergent light is larger than the emergent angle range of the second light, namely the first emergent light is wide in visual angle, and the second emergent light is narrow in visual angle. Compared with the prior art, the wide and narrow visual angle switching of the backlight module and the display device is not controlled by the PDLC any more, but directly switches the wide and narrow visual angle by controlling the emergent angle range of emergent light of the backlight module, and further, in a wide visual angle mode, because the light is emitted after being converted by the first optical structure without being controlled by the PDLC any more, the display effect is better when the wide visual angle is displayed.
According to the manufacturing method of the light guide plate provided by the embodiment of the invention, the first optical structure and the second optical structure formed by the injection molding process have better reliability in controlling wide and narrow viewing angle switching compared with PDLC.
Furthermore, the refractive index of the second medium layer is greater than that of the first medium layer, so that a total reflection surface is formed on the contact surface of the second medium layer and the first medium layer, and second incident light provided by the second light source cannot enter the first medium layer, so that the second incident light is prevented from being influenced by the first optical structure, and the light emitting effect in the narrow viewing angle mode is further improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.
Claims (9)
1. A backlight module, comprising:
a first dielectric layer having a plurality of first optical structures;
the second medium layer is positioned on the first medium layer and is provided with a plurality of second optical structures;
the first light source is used for providing first incident light, the first incident light is converted into first emergent light by the light guide surfaces of the first optical structures, and the first emergent light is emitted to the light emitting side of the backlight module through the first medium layer and the second medium layer in sequence; and
a second light source for providing a second incident light, wherein the second incident light is converted into a second emergent light by the light guide surfaces of the plurality of second optical structures, and the second emergent light is emitted to the light emitting side of the backlight module through the second medium layer,
wherein the radian of the light guide surface of the first optical structure protruding towards the first light source is larger than the radian of the light guide surface of the second optical structure protruding towards the second light source,
the refractive index of the second medium layer is larger than that of the first medium layer, so that a total reflection surface is formed on the contact surface of the second medium layer and the first medium layer.
2. The backlight module of claim 1, wherein the first dielectric layer comprises a first end portion adjacent to the first light source,
the height of the first end part is gradually reduced in the direction from the side close to the first light source to the side far away from the first light source;
the second dielectric layer includes a second end portion adjacent the second light source,
the height of the second end portion gradually becomes smaller in a direction from a side close to the second light source to a side far away from the second light source.
3. The backlight module as claimed in claim 2, wherein the first dielectric layer further comprises a first extension connected to the first end, the plurality of first optical structures are disposed on a lower surface of the first extension, and the plurality of second optical structures are disposed on an upper surface of the first extension;
the second dielectric layer further includes a second extension portion covering the upper surface of the first extension portion and the plurality of second optical structures, and connected to the second end portion.
4. The backlight module according to claim 3, wherein the second end is located on a side of the first extending portion away from the first light source.
5. The backlight module according to claim 4, wherein the first end portion and the second end portion have a right trapezoid cross section, the first extending portion and the second extending portion have a rectangular cross section,
the plane of the right-angle side of the first end part and the lower surface of the first extension part are positioned on the same plane,
the plane where the right-angle side of the second end part is located and the upper surface of the second extending part are located on the same plane.
6. The backlight module according to claim 5, further comprising a control module electrically connected to the first light source and the second light source respectively for gating one of the first light source and the second light source according to a mode signal.
7. A display device comprising the backlight module of any one of claims 1-6.
8. A method for manufacturing a light guide plate comprises forming a second medium layer on the upper surface of a first medium layer, wherein the first medium layer has a plurality of first optical structures, the second medium layer has a plurality of second optical structures,
wherein the radian of the light guide surface of the first optical structure protruding towards the first light source is larger than the radian of the light guide surface of the second optical structure protruding towards the second light source,
the first optical structure and the second optical structure are formed by adopting an injection molding process,
the refractive index of the second medium layer is larger than that of the first medium layer, so that a total reflection surface is formed on the contact surface of the second medium layer and the first medium layer.
9. The method for manufacturing a light guide plate according to claim 8, wherein the material of the first dielectric layer comprises optical glass, and the material of the second dielectric layer comprises polycarbonate material.
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| CN105278029A (en) * | 2014-05-26 | 2016-01-27 | 元太科技工业股份有限公司 | Front light module and display device |
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| CN110308512A (en) | 2019-10-08 |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: Kunshan Longteng Optronics Co., Ltd. |
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