CN113031340A - Display device - Google Patents
Display device Download PDFInfo
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- CN113031340A CN113031340A CN201911358552.9A CN201911358552A CN113031340A CN 113031340 A CN113031340 A CN 113031340A CN 201911358552 A CN201911358552 A CN 201911358552A CN 113031340 A CN113031340 A CN 113031340A
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- Prior art keywords
- back plate
- light bar
- sensitive adhesive
- melt pressure
- display device
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
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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
- G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
Abstract
The invention discloses a display device, which comprises a backlight module and a display panel, wherein the backlight module comprises: the lamp comprises a back plate, a lamp strip and a bonding layer arranged between the back plate and the lamp strip. According to the invention, the light bar is fixed by arranging the bonding layer on the back plate, so that two sides of the bonding layer are respectively and tightly bonded with the back plate and the light bar, the bonding layer is made of hot-melt pressure-sensitive adhesive and has good heat conduction property, heat generated by the light bar during operation can be transferred to the back plate through the hot-melt pressure-sensitive adhesive, and the heat is dissipated to the environment through the back plate, so that the heat dissipation efficiency is higher. When the backlight module works, the maximum temperature of the lamp strip is as high as 85 ℃, and the softening point of the hot-melt pressure-sensitive adhesive adopted by the invention is above 90 ℃, so that the problem that the adhesive layer fails and the adhesive is separated when the lamp strip is in a high-heat state can be avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
The liquid crystal display screen has the advantages of low power consumption, small volume, low radiation and the like as the current mainstream display screen. The liquid crystal display panel is a non-self-luminous panel and needs to be matched with a backlight module for use.
The backlight module is divided into a lateral backlight module and a direct backlight module, the lateral backlight module has the advantage of thickness, but as large-size display screens are more and more widely applied in the field of televisions, the lateral backlight module has weak energy at the far end of the light guide plate, and even if the scattering microstructures are encrypted, the optical energy distribution of the lateral backlight module is still difficult to change. The double-side lamp arrangement method is difficult to solve the above problems and is expensive when faced with larger-sized panel displays. Therefore, the direct type backlight module has the irreplaceable advantage.
The connection of lamp strip and backplate usually adopts modes such as buckle, screw or point to glue among the present straight following formula backlight unit, and this kind of mode can make to have large tracts of land gap between lamp strip and the backplate, leads to the lamp strip heat dissipation bad, produces the inside high temperature of module, lamp strip deformation or inefficacy scheduling problem.
Disclosure of Invention
The invention provides a display device, which is used for improving the heat dissipation efficiency of a backlight module and widening the applicable temperature range of the backlight module.
The present invention provides a display device including:
the backlight module is used for providing backlight;
the display panel is positioned on the light emitting side of the backlight module and used for displaying images;
the backlight module includes:
the back plate has supporting and bearing functions;
the light bar is arranged on the back plate and is used as a backlight source;
the bonding layer is positioned between the back plate and the light bar and is used for bonding the light bar on the back plate;
wherein the bonding layer is made of hot-melt pressure-sensitive adhesive, and the softening point of the hot-melt pressure-sensitive adhesive is greater than 90 ℃.
In a possible implementation manner, in the display device provided by the invention, the adhesive layer includes a plurality of strip-shaped adhesive portions.
In a possible implementation manner, in the display device provided by the invention, an extending direction of the bonding portion is parallel to an extending direction of the light bar;
the bonding parts correspond to the light bars one to one, and the orthographic projection of the light bars on the back plate completely covers the orthographic projection of the bonding parts on the back plate.
In a possible implementation manner, in the display device provided by the invention, an extending direction of the bonding portion is perpendicular to an extending direction of the light bar;
the orthographic projection of the light bar on the back plate is partially overlapped with the orthographic projection of the bonding part on the back plate.
In one possible implementation, in the above display device provided by the present invention, the hot-melt pressure-sensitive adhesive employs a polymer adhesive system of styrene and 2-methyl-1, 3-butadiene.
In one possible implementation manner, in the display device provided by the invention, the thickness of the hot-melt pressure-sensitive adhesive is 0.2mm-0.3 mm.
In one possible implementation manner, in the display device provided by the invention, the viscosity of the hot-melt pressure-sensitive adhesive is 6000cps to 13000 cps.
In one possible implementation manner, in the display device provided by the invention, the annular initial adhesion force of the hot-melt pressure-sensitive adhesive is more than 8N/in2The initial viscosity of the rolling ball is larger than that of a No. 5 ball, and the retention force at 100 ℃ is larger than 8 minutes.
In one possible implementation manner, in the display device provided by the invention, the operation temperature of the hot-melt pressure-sensitive adhesive is 150 ℃ to 210 ℃.
In a possible implementation manner, in the display device provided by the present invention, the backlight module further includes:
the reflector plate is positioned on one side of the light bar, which is far away from the back plate, and the reflector plate comprises a plurality of windows for exposing light sources on the light bar;
the diffusion plate is positioned on one side of the light bar, which is far away from the back plate;
and the optical film is positioned on one side of the diffusion plate, which deviates from the light bar.
The invention has the following beneficial effects:
the present invention provides a display device including: the backlight module is used for providing backlight; the display panel is positioned on the light emitting side of the backlight module and used for displaying images; the backlight module includes: the back plate has supporting and bearing functions; the light bar is arranged on the back plate and is used as a backlight source; the bonding layer is positioned between the back plate and the light bar and is used for bonding the light bar on the back plate; wherein, the adhesive layer adopts hot melt pressure sensitive adhesive, and the softening point of the hot melt pressure sensitive adhesive is more than 90 ℃. According to the invention, the light bar is fixed by arranging the bonding layer on the back plate, so that two sides of the bonding layer are respectively and tightly bonded with the back plate and the light bar, the bonding layer is made of hot-melt pressure-sensitive adhesive and has good heat conduction property, heat generated by the light bar during operation can be transferred to the back plate through the hot-melt pressure-sensitive adhesive, and the heat is dissipated to the environment through the back plate, so that the heat dissipation efficiency is higher. When the backlight module works, the maximum temperature of the lamp strip is as high as 85 ℃, and the softening point of the hot-melt pressure-sensitive adhesive adopted by the invention is above 90 ℃, so that the problem that the adhesive layer fails and the adhesive is separated when the lamp strip is in a high-heat state can be avoided.
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 of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;
fig. 3 is a schematic top view of a backlight module according to an embodiment of the present invention;
FIG. 4 is a schematic top view of a backlight module corresponding to the bonding portion structure shown in FIG. 3;
fig. 5 is a second schematic top view of a backlight module according to an embodiment of the present invention;
FIG. 6 is a schematic top view of a backlight module corresponding to the bonding structure shown in FIG. 5;
fig. 7 is a second schematic cross-sectional view of a backlight module according to an embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 1, the display device according to the embodiment of the present invention includes: a backlight module 100 and a display panel 200.
The backlight module 100 is used for providing backlight.
The backlight module 100 can uniformly emit light in the whole light emitting surface, and is used for providing light with sufficient brightness and uniform distribution for the display panel, so that the display panel can normally display images.
The display panel 200 is located on the light emitting side of the backlight module 100 for displaying images.
The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of light incident to the pixel unit from the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.
The display device provided by the embodiment of the invention can be a display device such as a liquid crystal display screen, a liquid crystal display, a liquid crystal television and the like, and can also be a mobile terminal such as a mobile phone, a tablet personal computer, an intelligent photo album and the like. The display device adopts the backlight module to provide backlight, and the display panel modulates the light emitted by the backlight module to realize image display.
Fig. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the present invention, and as shown in fig. 2, the backlight module according to the embodiment of the present invention includes: back panel 11, light bar 12, and adhesive layer 13.
And the back plate 11 has supporting and bearing functions.
The display device provided by the embodiment of the invention can adopt a direct type backlight module, and the back plate 11 in the direct type backlight module can be made of metal materials, for example, materials such as aluminum alloy, aluminum-zinc-plated plate, stainless steel and the like can be adopted as the back plate material. The back plate 11 may be formed by a stamping process, and the edge of the back plate 11 generally includes an inclined surface, which can reflect a large-angle light emitted from the light source to the light-emitting side of the backlight module, so as to improve the utilization efficiency of the light source.
And the light bar 12 is arranged on the back plate 11 and used as a backlight source.
In a specific implementation, a Light Emitting Diode (LED) is usually used as a Light source, and the LED needs to be driven by a circuit. Specifically, a block-shaped circuit board with a plurality of LEDs arranged in an array on the whole circuit board may be adopted, but if the number of LEDs is large, the circuit design of the circuit board is relatively complex, so that in the embodiment of the present invention, the light bar 12 is adopted as the backlight source, and when the direct-type backlight is performed, a plurality of light bars may be arranged on the back plate, and the light bars may be arranged at set intervals. The light bar 12 includes a strip-shaped Circuit Board, which may be a Printed Circuit Board (PCB), and the surface of the PCB has a pad connected to the LED, and the LED is soldered to the corresponding pad, and the corresponding LED is driven to emit light by applying a driving signal to the PCB.
And the adhesive layer 13 is positioned between the back plate 11 and the light bar 12 and used for adhering the light bar 12 to the back plate 11.
According to the embodiment of the invention, the light bar 12 is fixed by arranging the bonding layer 13 on the back plate 11, and two sides of the bonding layer 13 are respectively and tightly bonded with the back plate 11 and the light bar 12. The adhesive layer 13 adopted in the embodiment of the invention is made of hot-melt pressure-sensitive adhesive, so that the adhesive layer has good heat conducting property, heat generated by the lamp strip during operation can be transferred to the back plate through the hot-melt pressure-sensitive adhesive, and the heat can be dissipated to the environment through the back plate, so that the heat dissipation efficiency is high. Compare in the mode of adopting fixed lamp strip such as buckle, screw among the prior art, the temperature of lamp strip can descend 29%, and the temperature of backplate can descend more than 14%.
The pressure-sensitive adhesive is sensitive to pressure, can be adhered to an adherend by slight pressure through finger pressure, adopts the pressure-sensitive adhesive as an adhesive for the backlight module, and only needs to press the welding rod onto the back plate so as to fix the lamp strip. The hot-melt pressure-sensitive adhesive adopted by the embodiment of the invention is in a liquid state under a high-temperature heating state, can be sprayed to a specified position by adopting a spraying device, and is in a solid state after the temperature is reduced, so that the hot-melt pressure-sensitive adhesive has better viscosity. In practical application, when the backlight module works, the maximum temperature of the lamp strip is as high as 85 ℃, and if the adhesive layer is separated at high temperature, the problems of white clusters, dark shadows, lamp shadows and the like of the display device can be caused subjectively. The softening point of the hot-melt pressure-sensitive adhesive adopted by the embodiment of the invention is above 90 ℃, namely the hot-melt pressure-sensitive adhesive begins to soften after the temperature exceeds 90 ℃, so that the problem that the adhesive layer fails and the adhesive is separated when the lamp strip is in a high-heat state can be avoided. The backlight module provided by the embodiment of the invention can adapt to different environments and can be normally used at the ambient temperature of-40-45 ℃.
Fig. 3 and 5 are schematic top-view structural diagrams of a backlight module according to an embodiment of the present invention, and as shown in fig. 3 and 5, the adhesive layer 13 according to an embodiment of the present invention includes a plurality of strip-shaped adhesive portions 131.
In specific implementation, the hot melt pressure sensitive adhesive is melted, and then the melted hot melt pressure sensitive adhesive is sprayed on the back panel 11 by an air spray gun or an airless spray gun to form a plurality of strip-shaped bonding portions 131, and then the light bar 12 is placed on the bonding portions 131 and pressed into a whole. In manufacturing, the hot melt pressure sensitive adhesive may be sprayed by a spray gun with a rectangular nozzle, so that a plurality of layers of spot-shaped bonding portions 131 are formed on the surface of the back plate, and the bonding portions with such shapes have higher bonding areas and bonding thicknesses, so as to ensure the bonding force between the back plate 11 and the light bar 12 and prevent the light bar 12 from falling off from the surface of the back plate 11.
The hot-melt pressure-sensitive adhesive can be sprayed by adopting online spraying equipment, and the movement track of the spray head can be adjusted online by the online spraying equipment, so that the use requirements of different modules can be met. The spraying speed can be controlled between 500mm/s and 1500mm/s, thereby greatly improving the production efficiency. And compared with the fixing mode in the prior art, the mode of adopting the hot melt pressure sensitive adhesive to bond the back plate and the light bar can reduce the production cost by at least 20%.
As shown in fig. 3, the bonds 131 may extend in the x-direction; alternatively, as shown in fig. 4, the adhesive portion 131 may extend in the y direction. In specific implementation, the extending direction of the bonding portion 131 may be set according to actual requirements, and in the embodiment of the present invention, the extending direction of the bonding portion 131 may be set according to the extending direction of the light bar 12.
Fig. 4 is a schematic top view of the backlight module corresponding to the bonding portion structure shown in fig. 3, as shown in fig. 4, if the extending direction of the light bars 12 is the x direction and the arrangement direction of the light bars 12 is the y direction, the extending direction of the bonding portion 131 can be set to be parallel to the extending direction of the light bars 12; and one adhesive portion 131 corresponds to one light bar 12.
Every lamp strip 12 all bonds on backplate 11 through a banding bonding portion 131, and the shape of bonding portion 131 all is the strip with lamp strip 12, adopts such fixed mode can ensure the stability that the lamp strip bonded. In specific implementation, hot melt pressure sensitive adhesive is sprayed on the surface of the back panel 11 at a position where the light bar is needed to form a strip-shaped bonding portion 131, and then the light bar 12 is pressed on the corresponding bonding portion 131, so that the light bar 12 is bonded on the back panel 11. As shown in fig. 4, the width of the bonding portion 131 perpendicular to the extending direction may be less than or equal to the width of the light bar perpendicular to the extending direction, that is, the orthographic projection of the light bar 12 on the back panel 11 completely covers the orthographic projection of the bonding portion 131 on the back panel 11.
Fig. 6 is a schematic top view of the backlight module corresponding to the structure of the bonding portion shown in fig. 5, and as shown in fig. 6, the extending direction of the light bars 12 is an x direction, and the arrangement direction of the light bars 12 is a y direction, then the extending direction of the bonding portion 131 may be perpendicular to the extending direction of the light bars 12, that is, the extending direction of the bonding portion 131 is a y direction.
In a specific implementation, hot melt pressure sensitive adhesive may be sprayed in the y direction to form the adhesive portions 131, and the adhesive portions 131 have a set width and are arranged in the x direction at a certain distance. After the adhesive portions are coated, the light bar 12 is pressed against the adhesive portions 131 in the x direction, so that the light bar 12 is adhered to the back panel 11. By adopting the fixing mode, the use amount of the hot melt pressure sensitive adhesive can be reduced, thereby reducing the production cost. As shown in fig. 6, the orthographic projection of the light bar 12 on the back panel 11 is overlapped with the orthographic projection of the bonding portion 131 on the back panel 11 by adopting the fixing manner, as can be seen from fig. 6, a part of the bonding portion 131 is not shielded by the light bar 12, and a reflective sheet is arranged above the light bar 12 in the backlight module, so that the bonding portion 131 of the unshielded portion can be used for bonding the reflective sheet, and the process steps are simplified.
The hot-melt pressure-sensitive adhesive used in the embodiment of the present invention may be a polymer resin material with a softening point of more than 90 ℃, and preferably may be a polymer adhesive system of styrene and 2-methyl-1, 3-butadiene. Compared with other colloid materials, the polymer colloid system of the styrene and the 2-methyl-1, 3-butadiene has higher softening point and higher viscosity at the ambient temperature of-40 ℃ to 45 ℃, and can ensure that the light bar 12 cannot fall off on the back plate 11 at the ambient temperature of-40 ℃ to 45 ℃.
When the backlight module works, the temperature of the lamp strip can reach 85 ℃, and if the adhesive layer is separated at high temperature, the problems of white clusters, dark shadows, lamp shadows and the like of the display device can be caused subjectively. The softening point of the hot-melt pressure-sensitive adhesive adopted by the embodiment of the invention is above 90 ℃, namely the hot-melt pressure-sensitive adhesive begins to soften after the temperature exceeds 90 ℃, so that the problem that the adhesive layer fails and the adhesive is separated when the lamp strip is in a high-heat state can be avoided. In practice, the softening point of the hot melt pressure sensitive adhesive may be in the range of 90 ℃ to 140 ℃.
In specific implementation, the viscosity of the adhesive layer 13 is in the range of 4000cps to 50000cps, so that the process requirements can be met, and the light bar 12 can be firmly adhered to the back plate 11. The hot melt pressure sensitive adhesive adopted by the embodiment of the invention considers that the spraying speed is higher when the operating temperature is 150-210 ℃ and the requirement of the production rate is met, so the operating temperature of the hot melt pressure sensitive adhesive, namely the nozzle temperature of the spraying equipment is set to be 180-190 ℃ when the hot melt pressure sensitive adhesive is applied, the fluidity of the hot melt pressure sensitive adhesive is suitable, the quick spraying speed can be protected, the spraying amount is also suitable, the viscosity of the hot melt pressure sensitive adhesive can be controlled to be in the range of 6000cps-13000cps at the operating temperature, the hot melt pressure sensitive adhesive has better viscosity, and the uniformity and the smoothness of the bonding layer formed by spraying are better.
When the light bar 12 is adhered, the easy adhesion of the adhesive needs to be considered, and the annular initial adhesion of the hot-melt pressure-sensitive adhesive adopted by the embodiment of the invention is more than 8N/in2And the initial adhesion of the rolling ball is greater than a No. 5 ball, so that the bonding requirement of the lamp strip 12 on the back plate 11 can be met, and the problem of poor bonding such as glue failure of the lamp strip is avoided.
In consideration of the fact that the backlight module prepared in the bonding fixing mode needs to be used in different environments, the retention force of the hot-melt pressure-sensitive adhesive adopted in the embodiment of the invention at the high temperature of 100 ℃ is more than 8 minutes, so that the problem of the light bar being separated can be avoided even if the light bar is bonded in the high temperature environment.
In actual manufacturing process, the surface of backplate 11 and the lower surface of lamp strip 12 are not totally smooth, consequently need the tie coat, and hot melt pressure sensitive adhesive has certain thickness promptly, so both can guarantee its adhesion and also can avoid because the not good condition of contact that the roughness error on backplate 11 and lamp strip 12 surface caused takes place.
The thickness of the hot-melt pressure-sensitive adhesive adopted by the embodiment of the invention can be set to be 0.2mm-0.3 mm. If the thickness of the hot-melt pressure-sensitive adhesive is too thin, the problem of poor bonding of the light bar can be caused, when the thickness of the hot-melt pressure-sensitive adhesive is set to be 0.2mm-0.3mm, the hot-melt pressure-sensitive adhesive can be completely filled between the back plate 11 and the light bar 12, the problem of poor bonding of the light bar is avoided, the hot-melt pressure-sensitive adhesive has better heat conduction performance within the range, and heat generated by the light bar can be transmitted to the back plate to dissipate heat timely.
Fig. 7 is a second schematic cross-sectional view illustrating a backlight module according to an embodiment of the present invention, and as shown in fig. 7, the backlight module according to the embodiment of the present invention further includes:
and the reflector 14 is positioned on one side of the light bar 12, which faces away from the back plate 11.
The reflector 14 is disposed on one side of the circuit board of the light bar, which is close to the light source, and the reflector 14 needs to have a plurality of windows at positions corresponding to the light source for exposing the light source. The reflector 14 can receive the wide-angle light emitted from the light source and reflect the light toward the light-emitting side of the light bar, thereby improving the utilization efficiency of the light source. In addition, a cavity is formed between the reflector plate 14 and the optical film on the light emergent side of the light bar, and light can be reflected in the cavity, so that the light can be sufficiently mixed, and the uniformity of emergent light of the backlight module is improved.
The diffusion plate 15 is usually provided with a scattering particle material, and after the light enters the diffusion plate, the scattering particle material continuously refracts and reflects the light, so as to achieve the effect of scattering the light, and further achieve the effect of light uniformizing. The material of the diffuser plate is generally at least one selected from the group consisting of polymethyl methacrylate (PMMA), Polycarbonate (PC), polystyrene-based material (PS), and polypropylene (PP), but not limited thereto. The diffusion plate 15 can further homogenize the light emitted from the light bar 12, and then emit the homogenized light to the optical film.
And an optical film 16 positioned on a side of the diffuser plate 15 facing away from the light bar 12.
The optical iris 16 may include various types of irises, for example, the optical iris 16 may include: brightening composite sheets (Prism sheets) and Micro-lens-Prism composite films (Micro-lens on Prism, MOP for short), quantum dot diaphragms, reflective polarizers and the like. The optical film 16 can adjust the light exit angle to increase the light exit brightness of the front surface of the backlight module. The quantum dot film can provide quantum dot luminescence with higher monochromaticity, and is applied to quantum dot televisions to improve the display color gamut of the televisions. The reflective polarizer can improve the utilization rate of light, and simultaneously, the emergent light has polarization property, thereby omitting the use of the polarizer under the liquid crystal display panel.
The display device provided by the embodiment of the invention comprises: the backlight module is used for providing backlight; the display panel is positioned on the light emitting side of the backlight module and used for displaying images; the backlight module includes: the back plate has supporting and bearing functions; the light bar is arranged on the back plate and is used as a backlight source; the bonding layer is positioned between the back plate and the light bar and is used for bonding the light bar on the back plate; wherein, the adhesive layer adopts hot melt pressure sensitive adhesive, and the softening point of the hot melt pressure sensitive adhesive is more than 90 ℃. According to the invention, the light bar is fixed by arranging the bonding layer on the back plate, so that two sides of the bonding layer are respectively and tightly bonded with the back plate and the light bar, the bonding layer is made of hot-melt pressure-sensitive adhesive and has good heat conduction property, heat generated by the light bar during operation can be transferred to the back plate through the hot-melt pressure-sensitive adhesive, and the heat is dissipated to the environment through the back plate, so that the heat dissipation efficiency is higher. When the backlight module works, the maximum temperature of the lamp strip is as high as 85 ℃, and the softening point of the hot-melt pressure-sensitive adhesive adopted by the invention is above 90 ℃, so that the problem that the adhesive layer fails and the adhesive is separated when the lamp strip is in a high-heat state can be avoided.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A display device, comprising:
the backlight module is used for providing backlight;
the display panel is positioned on the light emitting side of the backlight module and used for displaying images;
the backlight module includes:
the back plate has supporting and bearing functions;
the light bar is arranged on the back plate and is used as a backlight source;
the bonding layer is positioned between the back plate and the light bar and is used for bonding the light bar on the back plate;
wherein the bonding layer is made of hot-melt pressure-sensitive adhesive, and the softening point of the hot-melt pressure-sensitive adhesive is greater than 90 ℃.
2. The display device according to claim 1, wherein the adhesive layer includes a plurality of stripe-shaped adhesive portions.
3. The display device of claim 2, wherein the adhesive portion extends in a direction parallel to the extending direction of the light bar;
the bonding parts correspond to the light bars one to one, and the orthographic projection of the light bars on the back plate completely covers the orthographic projection of the bonding parts on the back plate.
4. The display device of claim 2, wherein the adhesive portion extends in a direction perpendicular to the extending direction of the light bar;
the orthographic projection of the light bar on the back plate is partially overlapped with the orthographic projection of the bonding part on the back plate.
5. The display apparatus according to any one of claims 1 to 4, wherein the hot melt pressure sensitive adhesive employs a polymer adhesive system of styrene and 2-methyl-1, 3-butadiene.
6. The display device of claim 5, wherein the thickness of the hot melt pressure sensitive adhesive is 0.2mm to 0.3 mm.
7. The display device of claim 5, wherein the hot melt pressure sensitive adhesive has a viscosity of 6000cps to 13000 cps.
8. The display device of claim 5, wherein the hot melt pressure sensitive adhesive has an initial tack in loop greater than 8N/in2The initial viscosity of the rolling ball is larger than that of a No. 5 ball, and the retention force at 100 ℃ is larger than 8 minutes.
9. The display device of claim 5, wherein the hot melt pressure sensitive adhesive has an operating temperature of 150 ℃ to 210 ℃.
10. The display device according to any one of claims 1 to 4, wherein the backlight module further comprises:
the reflector plate is positioned on one side of the light bar, which is far away from the back plate, and the reflector plate comprises a plurality of windows for exposing light sources on the light bar;
the diffusion plate is positioned on one side of the light bar, which is far away from the back plate;
and the optical film is positioned on one side of the diffusion plate, which deviates from the light bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911358552.9A CN113031340A (en) | 2019-12-25 | 2019-12-25 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911358552.9A CN113031340A (en) | 2019-12-25 | 2019-12-25 | Display device |
Publications (1)
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| CN109445181A (en) * | 2018-12-14 | 2019-03-08 | 深圳创维－Rgb电子有限公司 | A kind of packaging technology of display module |
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| CN103017038A (en) * | 2012-12-13 | 2013-04-03 | 京东方科技集团股份有限公司 | Direct type backlight source and display device |
| CN103439833A (en) * | 2013-08-21 | 2013-12-11 | 深圳Tcl新技术有限公司 | Backlight module and display device comprising same |
| WO2015024364A1 (en) * | 2013-08-21 | 2015-02-26 | 深圳Tcl新技术有限公司 | Backlight module and display device comprising same |
| CN208283691U (en) * | 2018-05-29 | 2018-12-25 | 苏州乐轩科技有限公司 | A kind of novel display device |
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