CN107300808B - Backlight module and display device thereof - Google Patents
Backlight module and display device thereof Download PDFInfo
- Publication number
- CN107300808B CN107300808B CN201710574870.3A CN201710574870A CN107300808B CN 107300808 B CN107300808 B CN 107300808B CN 201710574870 A CN201710574870 A CN 201710574870A CN 107300808 B CN107300808 B CN 107300808B
- Authority
- CN
- China
- Prior art keywords
- light
- guide plate
- backlight module
- light guide
- protrusions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000012788 optical film Substances 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims description 31
- 238000000576 coating method Methods 0.000 claims description 31
- 230000008093 supporting effect Effects 0.000 claims description 23
- 239000010410 layer Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims description 10
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000005192 partition Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000009792 diffusion process Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920005372 Plexiglas® Polymers 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The embodiment of the invention provides a backlight module and a display device thereof, relates to the technical field of display, and is used for improving the contrast of a display picture. The backlight module comprises a light source, an optical film material and a light guide plate arranged between the light source and the optical film material, the light guide plate comprises a plurality of bulges arranged on one side of the light guide plate close to the light source, the tops of the bulges are one ends of the bulges close to the light source, at least one hemispherical recess is arranged at the top of each bulge, the radius of each hemispherical recess is smaller than the distance from the top surface of each bulge to the bottom surface of the light guide plate, and the bottom surface of the light guide plate is the side of the light guide plate far away from the light source; the light source comprises a plurality of light-emitting elements which are arranged corresponding to the recesses; the backlight module also comprises a reflecting part which is arranged on the side surface of the bulge. The backlight module is used in a display device.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a backlight module and a display device thereof.
[ background of the invention ]
The HUD (Head Up Display) provides a light source through a backlight module, and forms a Display picture which can be seen by a driver in Head-Up on a front windshield of an automobile through a TFTLCD (thin film Transistor-Liquid Crystal Display).
Because HUD's service environment is mainly outdoor to, HUD need can form visible picture on windshield through twice reflection, consequently need HUD's display module to have higher luminance and contrast, consequently need HUD backlight unit to have very high luminance, thereby make backlight unit consumption very big.
In the prior art, power consumption is generally reduced through a Local Dimming (Local Dimming) technique, while contrast is improved. That is, the backlight in the area where display is necessary is turned on, and the backlight in the area where display is unnecessary is turned off, thereby reducing power consumption and improving contrast (contrast) so that the screen is clearly visible.
However, when a certain area is lighted, light can be irradiated to an adjacent dark area from the lighted area, and even the light is irradiated to the whole backlight module, so that the contrast is greatly reduced, and the visibility of a display picture of the HUD is reduced.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a backlight module and a display device thereof, which are used to improve the contrast of a display image.
In a first aspect, the present invention provides a backlight module, which includes a light source, an optical film material and a light guide plate disposed between the light source and the optical film material, wherein the light guide plate includes a plurality of protrusions disposed on a side thereof close to the light source, a top of each protrusion is an end of the protrusion close to the light source, a top of each protrusion has at least one hemispherical recess, a radius of each hemispherical recess is smaller than a distance from a top surface of the protrusion to a bottom surface of the light guide plate, and the bottom surface of the light guide plate is a side of the light guide plate away from the light source; the light source comprises a plurality of light-emitting elements which are arranged corresponding to the recesses; the backlight module also comprises a reflecting part which is arranged on the side surface of the bulge.
Optionally, the light guide plate further includes a flat plate portion, and the flat plate portion is located between the bottom end of the protrusion and the bottom surface of the light guide plate;
the flat plate part comprises a light mixing part, and the light mixing part is an area of the flat plate part between adjacent protrusions.
Optionally, the thickness range of the light mixing part is greater than or equal to 0.3mm and less than or equal to 0.4 mm.
Optionally, the light guide plate is of an integrally formed structure.
Optionally, the top of each protrusion has only one hemispherical recess, and at least one light emitting element is disposed in one hemispherical recess.
Optionally, each of the convex tops has at least two hemispherical recesses, and each of the hemispherical recesses has at least one light emitting element therein.
Optionally, the reflective portion comprises a reflective coating.
Optionally, the reflective coating includes a portion of the outer surface of the light guide plate excluding the depression and the bottom surface of the light guide plate.
Optionally, the reflective portion further comprises a rigid plate;
a reflective coating is arranged on the surface of one side, close to the protrusion, of the rigid plate, and a transparent adhesive layer is arranged between the reflective coating and the side surface of the protrusion; or
The reflective coating is disposed directly on the outer surface of the protrusion, and the rigid plate is disposed on a side of the reflective coating away from the protrusion.
Optionally, the reflective portion comprises a rigid plate, and a reflective layer disposed between the rigid plate and the side surface of the protrusion;
the reflecting layer is white double-sided adhesive tape; or,
the reflecting layer is a reflecting sheet with a transparent adhesive layer arranged on one side close to the bulge.
Optionally, the rigid plate is made of iron.
Optionally, the protrusion is in a frustum structure or a circular truncated cone structure.
Optionally, the backlight module further includes a supporting plate disposed on one side of the light guide plate close to the light source, the supporting plate is provided with a plurality of through holes, the protrusions of the light guide plate are correspondingly inserted into the through holes, inner walls of the through holes contact the reflecting portion, and the supporting plate is used for supporting the reflecting portion.
Optionally, at least two side edges of the supporting plate are fixed in the frame glue of the backlight module.
Optionally, the light guide plate is made of a light-transmitting material, and the material of the light guide plate includes plastic and glass.
One of the above technical solutions has the following beneficial effects:
on one hand, the light guide plate is arranged between the optical film material and the light source, the side, close to the light source, of the light guide plate is provided with the plurality of protrusions, and the tops of the protrusions are provided with the hemispherical depressions and are arranged opposite to the light-emitting elements, so that the backlight module is partitioned and is arranged corresponding to the display partition of the display module, only the area needing to be displayed is lightened, the light-emitting elements in the rest areas are kept closed, and the power consumption of the backlight module is effectively reduced. On the other hand, the reflecting part is arranged on the side surface of the bulge, so that light rays are prevented from being irradiated into an adjacent area from one area, the influence on the brightness of the adjacent area is avoided, and the contrast is improved. Moreover, the reflecting part can effectively reflect the light irradiated on the reflecting part back to the area, and the brightness in the lighting area is increased. In addition, the concave part corresponding to the light-emitting element is arranged in a hemispherical shape, so that the diffusion angle of light can be effectively increased, the brightness in the whole lighting area is uniform, meanwhile, the light emitted from the light-emitting element can be limited in the area, the light is prevented from entering the adjacent area from the light mixing part, and the brightness of the area is reduced.
In a second aspect, the present invention provides a display device, which includes a display panel and the backlight module according to the first aspect of the present invention.
One of the above technical solutions has the following beneficial effects:
on one hand, the light guide plate is arranged between the optical film material and the light source in the display device, the plurality of protrusions are arranged on one side, close to the light source, of the light guide plate, the tops of the protrusions are provided with the hemispherical depressions and are arranged opposite to the light emitting elements, so that the backlight module is partitioned and is arranged corresponding to the display partition of the display module, only the area needing to be displayed is lightened, the light emitting elements in the rest areas are kept closed, and the power consumption of the backlight module is effectively reduced. On the other hand, the reflecting part is arranged on the side surface of the bulge, so that light rays are prevented from being irradiated into an adjacent area from one area, the influence on the brightness of the adjacent area is avoided, and the contrast is improved. Moreover, the reflecting part can effectively reflect the light irradiated on the reflecting part back to the area, and the brightness in the lighting area is increased. In addition, the concave part corresponding to the light-emitting element is arranged in a hemispherical shape, so that the diffusion angle of light can be effectively increased, the brightness in the whole lighting area is uniform, meanwhile, the light emitted from the light-emitting element can be limited in the area, the light is prevented from entering the adjacent area from the light mixing part, and the brightness of the area is reduced. Therefore, the contrast of the picture displayed by the display device is high, and the brightness is uniform.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is an exploded perspective view of a light guide plate and a light source according to an embodiment of the invention;
fig. 2 is a cross-sectional view of a backlight module according to an embodiment of the invention;
FIG. 3 is another cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 5a is a cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 5b is a cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 7a is a schematic view of a bump according to an embodiment of the present invention;
FIG. 7b is a schematic view of another structure of a bump according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 9 is a top view of a support plate provided in accordance with an embodiment of the present invention;
FIG. 10 is a cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 11 is a cross-sectional view of a display device according to an embodiment of the present invention;
fig. 12 is a schematic diagram illustrating a display principle of the display device according to the embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Fig. 1 and 2 show a backlight module, in which fig. 1 is an exploded perspective view of a light guide plate and a light source according to an embodiment of the present invention, and fig. 2 is a cross-sectional view of the backlight module according to the embodiment of the present invention. The backlight module comprises a light source 10, an optical film material 20 and a light guide plate 30 arranged between the light source 10 and the optical film material 20, wherein the light guide plate 30 comprises a plurality of protrusions 301 arranged on one side of the light guide plate 30 close to the light source 10, the tops of the protrusions 301 are one ends of the protrusions 301 close to the light source 10, the top of each protrusion 301 is provided with at least one hemispherical recess 302, the radius a of each hemispherical recess 302 is smaller than the distance b from the top surface of each protrusion 301 to the bottom surface of the light guide plate 30, and the bottom surface of the light guide plate 30 is the side of the light guide plate 30 far away from the light source 10; the light source 10 includes a plurality of light emitting elements 101, the light emitting elements 101 being disposed corresponding to the recesses 302; the backlight module further includes a reflection portion 40, and the reflection portion 40 is disposed on a side surface of the protrusion 301. Illustratively, as shown in fig. 2, the top of each protrusion 301 has a hemispherical recess 302, and the recess direction of the recess 302 is a direction from the top of the protrusion to the bottom surface of the light guide plate 30.
In this embodiment, one side of the light guide plate close to the light source is provided with a plurality of protrusions, the tops of the protrusions are provided with hemispherical depressions, and the depressions are arranged opposite to the light-emitting elements, so that the partitions of the backlight module are realized, the partitions of the backlight module are arranged corresponding to the display partitions of the display module, at this time, a user only needs to light the areas needing to be displayed, and the light-emitting elements in the other areas are kept closed, so that the power consumption of the backlight module is effectively reduced. When the light irradiates the bulge, on one hand, the reflecting part is arranged on the side surface of the bulge, so that the light can be prevented from irradiating the adjacent area from one area, the influence on the brightness of the adjacent area is avoided, and the contrast is improved; on the other hand, because the recess is hemispherical, the diffusion angle of light can be increased, and the internal brightness of the whole lighting area is uniform.
In the prior art, although the power consumption is reduced by the local backlight adjustment technology, due to the fact that there is no shielding between the area needing to be displayed and the area not needing to be displayed, light is diffused from a lighting area (display area) to a surrounding dark area, and the contrast of the light in the lighting area is reduced, especially in the case of dark external light, for example, rainy days or nights, the user experience is affected, and in the severe case, the normal use of the user can be affected. This embodiment is for prior art, on the one hand, through set up the light guide plate between optical film material and light source, one side that the light guide plate is close to the light source sets up a plurality of archs, protruding top has the hemisphere type sunken and sets up relatively with light emitting component to carry out the subregion to backlight unit, correspond the setting with display module's display partition, only light the region that needs to show, light emitting component in the remaining region keeps closing, and then the effectual consumption that reduces backlight unit. On the other hand, the reflecting part is arranged on the side surface of the bulge, so that light rays are prevented from being irradiated into an adjacent area from one area, the influence on the brightness of the adjacent area is avoided, and the contrast is improved. Moreover, the reflecting part can effectively reflect the light irradiated on the reflecting part back to the area, and the brightness in the lighting area is increased. In addition, the concave part corresponding to the light-emitting element is arranged in a hemispherical shape, so that the diffusion angle of light can be effectively increased, the brightness in the whole lighting area is uniform, meanwhile, the radius of the concave part is smaller than the distance from the top surface of the convex part to the bottom surface of the light guide plate, so that the light emitted from the light-emitting element can be ensured to be limited in the area, and the light is prevented from entering the adjacent area from the light mixing part; and the radius (height) of the depression cannot be too high, for example, the radius of the depression may be at most 1/2 from the apex of the protrusion to the height of the apex of the protrusion.
It should be noted that, as an example, fig. 2 shows two light emitting elements, two protrusions, and two recesses, and in fact, the number of protrusions and recesses on the light guide plate is much greater than 2, and the number of light emitting elements included in the light source is also much greater than 2, and the number of light emitting elements, protrusions, and recesses is not particularly limited in this embodiment. Also, the relative positional relationship between the respective members is schematically shown in fig. 2, and does not represent the actual positions of the respective members. In addition, the number of the protrusions, the depressions, and the light emitting elements in the drawings related to the embodiments of the present invention does not indicate the number in actual production, and the positions and thicknesses thereof do not indicate the actual positions and thicknesses. Of course, the shape of the recess in the present embodiment is not limited to a hemispherical shape, and other partially spherical shapes that can achieve the scattering effect on the light can be considered, and may be, for example, an 3/4 spherical shape, a 1/4 spherical shape, or a shape between 1/4 spherical shape and 3/4 spherical shape. For example, with the direction shown in fig. 2 as a reference, the optical film includes a diffusion sheet, a lower brightness enhancement sheet, and an upper brightness enhancement sheet from bottom to top.
In a specific embodiment, as shown in fig. 3, another cross-sectional view of a backlight module according to an embodiment of the invention is provided. The light guide plate further includes a flat plate portion 303, the flat plate portion 303 is located between the bottom end D1 of the protrusion 301 and the bottom surface D2 of the light guide plate, the flat plate portion 303 includes a light mixing portion 3031, and the light mixing portion 3031 is a region where the flat plate portion 303 is located between adjacent protrusions 301, such as a region between two vertical dashed lines shown in fig. 3. The light mixing part is arranged between the two bulges, so that light rays in adjacent areas can be mixed in the light mixing part, and the phenomenon that the display effect is influenced due to the fact that an obvious boundary line is formed at the boundary of the adjacent areas is avoided.
Further, referring again to fig. 3, the thickness of the light mixing portion 3031 is x, where x ranges from: x is more than or equal to 0.3mm and less than or equal to 0.4 mm. The light beam transmitted to the adjacent region through the light mixing part is very limited due to the small thickness of the light mixing part, and the light mixing part only plays a role in light mixing at the boundary of the two bulges and does not influence the contrast in the region needing to be displayed.
Referring to fig. 2 and 3 again, in the present embodiment, the light guide plate 30 is an integrally formed structure. The light guide plate is arranged to be in an integrated structure, so that on the basis that the light guide plate has the required light adjusting function, on one hand, the manufacturing steps can be saved, the production flow is simplified, the generation convenience is improved, and the generation cost is saved; on the other hand, the mounting steps can be simplified, the assembly convenience is improved, and the production efficiency is improved.
Further, the light guide plate in this embodiment is made of a light-transmitting material, and the material of the light guide plate may include plastic and glass. For example, polyacrylic plastic (PMMA, commonly known as plexiglas) and the like. The light guide plate made of the light-transmitting material has low light absorption rate and high transmittance, so that more light rays are emitted out to be matched with the reflecting part for use, and the utilization rate of the light rays is improved.
It should be noted that the light guide plate may be a plate-shaped structure with a certain thickness, for example, the protrusions are not air gaps but are made of transparent materials, and the light guide plate with a certain thickness can reflect, refract and scatter light in the light guide plate, thereby improving the uniformity of the light in the lighting area.
In one embodiment, the protrusions on one side of the light guide plate and the light emitting elements may have the following correspondence: the top of each protrusion is only provided with a hemispherical recess, and at least one light-emitting element is arranged in the hemispherical recess. As shown in fig. 2, a hemispherical recess 302 is formed at the top of one protrusion 301, the hemispherical recess 302 is disposed opposite to one light emitting element 101, the light emitting elements 101 can be located in the recess 302, the hemispherical recesses and the light emitting elements are disposed in a one-to-one correspondence manner, the fewer light emitting elements are in a lighting area, and the lower the power consumption is when the area is lighted; in addition, the protrusions and the light-emitting elements are arranged in a one-to-one correspondence manner, so that the distribution density of the protrusions on the light guide plate can be increased, the fineness of the backlight module for dividing the partitions is improved, and the brightness distribution uniformity of the lighting areas in the display partitions is improved.
In another possible embodiment, the protrusions on one side of the light guide plate and the light emitting elements may have the following correspondence: the top of each protrusion is provided with at least two hemispherical depressions, and each hemispherical depression is internally provided with at least one light-emitting element. As shown in fig. 3, in the present embodiment, each of the protrusions 301 has at least two hemispherical recesses 302 at the top, and one light emitting element 101 is disposed in one hemispherical recess 302. The more the number of the light-emitting elements corresponding to one protrusion is, the larger the displayed brightness is when the area is lightened, the higher the contrast ratio is, and the fewer the partitioned areas divided by the backlight module are, the simpler the lightening process is.
Optionally, the hemispherical recess and the light emitting element may have the following correspondence: at least two light-emitting elements are correspondingly arranged in one hemispherical recess, the number of the hemispherical recesses can be reduced by the design, and the difficulty of manufacturing a mold of the light guide plate is reduced.
It is to be noted that fig. 2 and 3 show the correspondence of the recesses and the light emitting elements as an example, but in fact, in the present embodiment, each recess may correspond to one light emitting element, and may also correspond to a plurality of light emitting elements. Also, the number of depressions provided in each projection is not particularly limited in this embodiment.
Naturally, the inventor sets the number of the light emitting elements corresponding to the protrusions in consideration of the power consumption and the lighting operation in the process of manufacturing the light guide plate.
In order to more effectively utilize the light in the lighting region and reduce the influence on the brightness in the adjacent sub-regions to improve the display contrast, as shown in fig. 4, which is another cross-sectional view of the backlight module according to the embodiment of the invention, the reflective portion 40 in the embodiment includes a reflective coating 401. The reflective coating 401 can be directly manufactured on the side surface of the protrusion 301, and the manufacturing process is simple. For example, the reflective coating 401 in this embodiment can be obtained by spraying or evaporation, and in a specific implementation, the reflective coating can be obtained by shielding the top surface of each protrusion of the light guide plate and the bottom surface of the light guide plate with a shielding object and then spraying or evaporation. The present invention is not particularly limited to a specific mode of obtaining the reflective coating layer.
Further, continuing with fig. 4, the reflective coating 401 includes portions of the outer surface of the light guide plate 30 other than the recesses 302 and the bottom surface of the light guide plate. The reflective coating 401 is positioned on the side surfaces of the protrusions 301 of the light guide plate and the outer surface of the light guide plate 30 except for the outer surface portions corresponding to the protrusions 301 and the outer surface portions corresponding to the bottom surface of the light guide plate 30. In a specific lighting area, because the side surface of the bulge is provided with the reflective coating, the light irradiated to the side surface of the bulge can be reflected, and the light is reflected back to the lighting area, so that the brightness in the lighting area is increased, and the utilization rate of the light is increased; on the other hand, the reflective coating arranged on the outer surface of the light guide plate except the outer surface part corresponding to the protrusion and the outer surface part corresponding to the bottom surface of the light guide plate can also reflect light, so that the light is reduced from being irradiated out of the other surfaces of the light guide plate except the bottom surface (namely the light emitting surface of the light guide plate), the utilization rate of the light is improved, particularly, the light irradiated to the part between two adjacent protrusions can be reflected through the reflective coating, the light is reflected again, the possibility of forming an obvious boundary between two adjacent protrusions is reduced, and the utilization rate and the display effect of the light are improved. Also, the larger the area covered by the reflective coating, the more light that can be reflected, and the higher the brightness of the light in the lit area.
In a possible implementation manner, as shown in fig. 5a, fig. 5a is a cross-sectional view of a backlight module provided in an embodiment of the present invention, the reflective portion further includes a rigid plate 402, a surface of the rigid plate 402 on a side close to the protrusion 301 is provided with a reflective coating 401, and a transparent adhesive layer (not shown in the figure) is provided between the reflective coating 401 and a side surface of the protrusion 301. In another possible implementation manner, as shown in fig. 5b, which is another cross-sectional view of the backlight module provided in the embodiment of the invention, the reflective coating 401 is directly disposed on the outer surface of the protrusion 301, and the rigid plate 402 is located on a side of the reflective coating 401 away from the protrusion 301.
By adopting the design, on one hand, the rigidity of the reflecting part can be increased by the rigid plate, the light guide plate is supported, the light guide plate is prevented from being directly used as a supporting component, and the possibility of damage of the light guide plate is reduced; on the other hand, the reflecting coating is arranged between the rigid plate and the bulge, so that the reflectivity of light rays can be increased, the light rays are converged in the lighting area, and the brightness in the lighting area is improved. In addition, the rigid plate may also function to protect the reflective coating. Also, when a transparent adhesive layer is disposed between the reflective coating layer and the protrusions, the transparent adhesive layer may fix the reflective coating layer to the side surfaces of the protrusions.
The reflective coating provided on the surface of the rigid plate may be obtained by vapor deposition or spray coating. The reflecting coating can be sprayed or evaporated on the surface of the rigid plate, and also can be sprayed or evaporated on the surface of the outer surface of the light guide plate except the recess and the bottom surface of the light guide plate.
Fig. 6 is a cross-sectional view of a backlight module according to another embodiment of the present invention. The reflection portion includes a rigid plate 402, and a reflection layer provided between the rigid plate 402 and the side surface of the projection 301, the reflection layer being a white double-sided tape 403; or the reflecting layer is a reflecting sheet 404 with a transparent adhesive layer arranged on one side close to the bulge 301. The rigidity of the reflecting part can be increased by the rigid plate, a certain supporting effect is realized on the light guide plate, the light guide plate is prevented from being directly used as a supporting part, the possibility of damage of the light guide plate is reduced, and the rigidity of the light guide plate is improved. When the light emitting element irradiates on the white double-sided adhesive tape, a part of light is reflected back to the lighting area through the white double-sided adhesive tape, so that the brightness in the lighting area is increased; meanwhile, the rigid plate is arranged on the outer side of the white double-sided adhesive tape, so that light penetrating through the white double-sided adhesive tape can be shielded, and light is prevented from entering adjacent regions to form mixed light. When the reflecting layer is a reflecting sheet with one side provided with a transparent adhesive layer, the reflecting sheet can be fixed on the outer side surface of the protrusion through the transparent adhesive layer, and the rigid plate can support the reflecting sheet.
Further, the rigid plate may be made of metal such as iron, nickel, and tin, and in this embodiment, the rigid plate is preferably made of iron because iron has high rigidity and is low in manufacturing cost, thereby saving manufacturing cost.
As shown in fig. 7a and 7b, fig. 7a is a schematic structural diagram of a bump provided in an embodiment of the present invention, and fig. 7b is a schematic structural diagram of another bump provided in an embodiment of the present invention. The protrusion 301 in this embodiment may be a truncated pyramid structure or a truncated cone structure.
Note that, as an example, in fig. 7a and 7b, a depression is not formed at the top of the projection, but actually, a hemispherical depression is provided at the top of the projection in the present embodiment. Fig. 7a and 7b exemplarily show a specific structure of the protrusion, but in fact, the invention is not limited to the specific structure of the protrusion, and any structure capable of forming a hemispherical depression at the top end of the protrusion can be included in the protection scope of the invention. Also, the size of the projections shown in the present embodiment does not represent an actual size.
In another embodiment, as shown in fig. 8 and 9, fig. 8 is a further cross-sectional view of the backlight module according to the embodiment of the present invention, fig. 9 is a top view of the supporting plate according to the embodiment of the present invention, the backlight module further includes a supporting plate 50, the supporting plate 50 is disposed on a side of the light guide plate 30 close to the light source 10, the supporting plate 50 is provided with a plurality of through holes 501, the protrusions 301 of the light guide plate 30 are correspondingly inserted into the through holes 501, inner walls of the through holes 501 contact with the reflective portion 40, and the supporting plate 50 is used for supporting the reflective portion 40.
It should be noted that the arrangement manner of the through holes may be determined according to the arrangement manner of the protrusions, in this embodiment, the protrusions disposed on the light guide plate may be arranged in an array manner, or may be unevenly distributed, in this embodiment, the arrangement manner of the protrusions is not particularly limited, and similarly, the arrangement manner of the through holes on the support plate is not particularly limited in this embodiment. Also, fig. 8 and 9 show the position and size of the protrusion as an example, but they do not represent a specific position and size in an actual production application.
Inevitably, the size of the through hole is only between the size of the shape of the top surface of the protrusion and the size of the shape of the bottom surface of the protrusion, namely, the through hole is sleeved on the protrusion.
Further, in order to fix the supporting plate and consolidate the supporting effect of the supporting plate on the reflection portion, as shown in fig. 10, which is another cross-sectional view of the backlight module provided in the embodiment of the present invention, at least two sides of the supporting plate 50 may be fixed in the sealant 60 of the backlight module.
In order to clearly understand the present solution, the present embodiment exemplarily shows an assembly method in which a rigid plate is placed in the through hole of the support plate, and then the light guide plate with the reflective coating is placed.
Fig. 11 and 12 show a display device according to the present embodiment, where fig. 11 is a cross-sectional view of the display device according to the embodiment of the present invention, and fig. 12 is a schematic diagram illustrating a display principle of the display device according to the embodiment of the present invention, and the display device 500 includes a display panel and the backlight module 1 according to the present embodiment. As shown in fig. 11, the display panel further includes an array substrate 21, a color filter substrate 22 opposite to the array substrate 21, and a liquid crystal layer 23 located between the array substrate 21 and the color filter substrate 22.
As shown in fig. 12, to explain the display principle by taking a head-up display as an example of a display device, light provided by the backlight module 1 is irradiated onto a flat mirror 52 through a display panel 51, and is reflected onto a curved mirror 53, and is finally displayed on a front windshield 54, so that a user can look at the head.
It should be noted that fig. 12 illustrates a head-up display as an example of the display device, but the display device is not limited to the head-up display, and specifically, the display device may include, but is not limited to, any electronic device having a display function, such as a Personal Computer (PC), a Personal Digital Assistant (PDA), a wireless handheld device, a tablet Computer (tablet Computer), an MP4 player, or a television.
In display device, on the one hand, through set up the light guide plate between optical film material and light source, one side that the light guide plate is close to the light source sets up a plurality of archs, and protruding top has the hemisphere type and caves in and sets up with light emitting component relatively to carry out the subregion to backlight unit, correspond the setting with display module's display partition, only light the region that needs to show, light emitting component in the remaining region keeps closing, and then the effectual consumption that reduces backlight unit. On the other hand, the reflecting part is arranged on the side surface of the bulge, so that light rays are prevented from being irradiated into an adjacent area from one area, the influence on the brightness of the adjacent area is avoided, and the contrast is improved. Moreover, the reflecting part can effectively reflect the light irradiated on the reflecting part back to the area, and the brightness in the lighting area is increased. In addition, the concave part corresponding to the light-emitting element is arranged in a hemispherical shape, so that the diffusion angle of light can be effectively increased, and the brightness in the whole lighting area is uniform. Therefore, the contrast of the picture displayed by the display device is high, and the brightness is uniform. In addition, the radius of the recess is smaller than the distance from the top surface of the protrusion to the bottom surface of the light guide plate, so that light can be limited in a specific certain area, the light is prevented from being diffused to an adjacent area, and the brightness in the area is effectively improved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (16)
1. A backlight module is characterized by comprising a light source, an optical film material and a light guide plate arranged between the light source and the optical film material, wherein the light guide plate comprises a plurality of protrusions arranged on one side of the light guide plate close to the light source, the tops of the protrusions are the ends of the protrusions close to the light source, the top of each protrusion is provided with at least one hemispherical recess, the radius of each hemispherical recess is smaller than the distance from the top surface of each protrusion to the bottom surface of the light guide plate, and the bottom surface of the light guide plate is the side of the light guide plate far away from the light source; the light source comprises a plurality of light-emitting elements which are arranged corresponding to the recesses; the backlight module also comprises a reflecting part which is arranged on the side surface of the bulge;
the concave direction of the recess is a direction from the top of the protrusion to the bottom surface of the light guide plate.
2. The backlight module according to claim 1, wherein the light guide plate further comprises a flat plate portion between the bottom ends of the protrusions and the bottom surface of the light guide plate;
the flat plate part comprises a light mixing part, and the light mixing part is an area of the flat plate part between the adjacent protrusions.
3. The backlight module according to claim 2, wherein the thickness of the light mixing part is in a range of 0.3mm or more and 0.4mm or less.
4. The backlight module as claimed in claim 2, wherein the light guide plate is of an integrally formed structure.
5. The backlight module as claimed in claim 1, wherein each of the protrusions has only one hemispherical recess at the top thereof, and at least one of the light emitting elements is disposed in one of the hemispherical recesses.
6. The backlight module as claimed in claim 1, wherein each of the protrusions has at least two hemispherical recesses at the top thereof, and each of the hemispherical recesses has at least one of the light emitting elements therein.
7. A backlight module according to claim 1, wherein the reflective portion comprises a reflective coating.
8. A backlight module according to claim 7, wherein the reflective coating comprises a portion of the outer surface of the light guide plate except the depressions and the bottom surface of the light guide plate.
9. A backlight module according to claim 7, wherein the reflective portion further comprises a rigid plate;
a reflective coating is arranged on the surface of one side, close to the protrusion, of the rigid plate, and a transparent adhesive layer is arranged between the reflective coating and the side surface of the protrusion; or
The reflective coating is directly arranged on the outer surface of the protrusion, and the rigid plate is positioned on one side of the reflective coating, which is far away from the protrusion.
10. A backlight module according to claim 1, wherein the reflective portion comprises a rigid plate, and a reflective layer disposed between the rigid plate and the side surface of the protrusion;
the reflecting layer is white double-sided adhesive tape; or,
the reflecting layer is a reflecting sheet with a transparent adhesive layer arranged on one side close to the bulge.
11. A backlight module according to claim 9 or 10, wherein the rigid plate is made of iron.
12. The backlight module according to claim 1, wherein the protrusions have a prismoid structure or a truncated cone structure.
13. The backlight module according to claim 1, further comprising a supporting plate disposed on a side of the light guide plate adjacent to the light source, wherein the supporting plate has a plurality of through holes, the protrusions of the light guide plate are correspondingly inserted into the through holes, inner walls of the through holes contact the reflective portion, and the supporting plate is used for supporting the reflective portion.
14. The backlight module as claimed in claim 13, wherein at least two sides of the supporting board are fixed in the frame glue of the backlight module.
15. The backlight module as claimed in claim 1, wherein the light guide plate is made of a light transmissive material, and the material of the light transmissive material includes plastic and glass.
16. A display device, comprising a display panel and the backlight module according to any one of claims 1 to 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710574870.3A CN107300808B (en) | 2017-07-12 | 2017-07-12 | Backlight module and display device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710574870.3A CN107300808B (en) | 2017-07-12 | 2017-07-12 | Backlight module and display device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107300808A CN107300808A (en) | 2017-10-27 |
| CN107300808B true CN107300808B (en) | 2020-04-28 |
Family
ID=60132824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710574870.3A Active CN107300808B (en) | 2017-07-12 | 2017-07-12 | Backlight module and display device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107300808B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114253029B (en) * | 2021-12-21 | 2023-12-12 | 天马微电子股份有限公司 | Backlight module and display device |
| CN114647114B (en) * | 2022-03-22 | 2023-10-17 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN114967235B (en) * | 2022-06-02 | 2024-05-31 | 深圳市宏普欣电子科技有限公司 | Mini led backlight display screen |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0695112A (en) * | 1992-09-16 | 1994-04-08 | Hitachi Ltd | Prism plate and information display device formed by using this plate |
| CN201097051Y (en) * | 2007-05-15 | 2008-08-06 | 中华映管股份有限公司 | Side light backlight module |
| CN102262262A (en) * | 2011-07-01 | 2011-11-30 | 青岛海信电器股份有限公司 | Light guide plate, backlight module and display device |
| CN102279436B (en) * | 2011-09-06 | 2014-11-19 | 青岛海信电器股份有限公司 | Backlight module and display device |
| JP2018522367A (en) * | 2015-05-13 | 2018-08-09 | コーニング インコーポレイテッド | Light guide with reduced hot spots and method of manufacturing the same |
-
2017
- 2017-07-12 CN CN201710574870.3A patent/CN107300808B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107300808A (en) | 2017-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110914746B (en) | Optical lens for ultra-thin direct-lighting backlight | |
| US20180149907A1 (en) | Aesthetic surface and display device with such a surface | |
| JP2019530967A (en) | Backlight unit and luminous flux control member for local dimming | |
| CN107300808B (en) | Backlight module and display device thereof | |
| CN109445180B (en) | Backlight module and display device | |
| KR20150117510A (en) | Optical element and backlight unit including the same | |
| JP2018083593A (en) | Display device | |
| CN110873980A (en) | Illumination device and display device provided with same | |
| TWI716100B (en) | Diffusion plate and backlight device with light path control function | |
| CN105579764A (en) | Illumination device and display device | |
| CN111665661B (en) | Backlight device and liquid crystal display device | |
| JP6990279B2 (en) | Light source device, lighting device, and display device | |
| EP3217214B1 (en) | Display apparatus | |
| KR101858062B1 (en) | Decorative lens and direct-type led planar lighting device provided with the same | |
| WO2017138080A1 (en) | Display device | |
| KR20140132571A (en) | Backlight unit | |
| CN113934058B (en) | Optical assembly, backlight module and display device | |
| TW202001380A (en) | Planar lighting device | |
| KR101327852B1 (en) | Backlight unit | |
| CN114624920A (en) | Back plate, backlight module and liquid crystal display device | |
| WO2017145240A1 (en) | Display device | |
| JP2007242410A (en) | Lighting device, electro-optical device, and manufacturing method therefor | |
| JP2005268021A (en) | Backlight structure of liquid crystal display | |
| CN109560213B (en) | Display panel and display device | |
| CN111033322A (en) | Light emitting device, surface light source device, and light flux controlling member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |