CN114624811A - Production method of display screen backlight module - Google Patents
Production method of display screen backlight module Download PDFInfo
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- CN114624811A CN114624811A CN202210531247.0A CN202210531247A CN114624811A CN 114624811 A CN114624811 A CN 114624811A CN 202210531247 A CN202210531247 A CN 202210531247A CN 114624811 A CN114624811 A CN 114624811A
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- light source
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
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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
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
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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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention relates to a production method of a display screen backlight module, which comprises the following steps: the method comprises the following steps of firstly, manufacturing a bottom cover, stacking a light reflecting plate and a light guide plate in a bottom cover cavity of the bottom cover, wherein the light guide plate is provided with an inclined light inlet surface, secondly, manufacturing a light source body, the light source body comprises a circuit board, an LED light source and a positioning optical block, an optical lens unit is arranged in the positioning optical block, the positioning optical block is also provided with a light outlet surface, an outer positioning surface and an inner positioning surface, thirdly, assembling the light source body in the bottom cover, carrying out first assembling and positioning on the light source body, connecting the light outlet surface of the positioning optical block to the inclined light inlet surface of the light guide plate, fourthly, assembling a pressing block, carrying out second assembling and positioning on the light source body, fifthly, assembling a heat dissipation positioning strip and a top cover, carrying out third assembling and positioning on the light source body, sixthly, assembling a light film layer, seventhly, and assembling a pressing cover.
Description
Technical Field
The present invention relates to a method for producing a backlight module, and more particularly, to a method for producing a backlight module in which a light source is obliquely disposed at one end of a light guide plate.
Background
The backlight module is one of the key components of the display screen. The function of the device is to provide sufficient light source with uniform brightness and distribution, so that the device can normally display images. The backlight module is a light source located at the back of the display screen, and the luminous effect of the backlight module directly affects the visual effect of the display screen. The backlight module provides a light source for the display screen. It mainly comprises a light source, a light guide plate, an optical film, a plastic frame and the like. The backlight module has the characteristics of high brightness, long service life, uniform light emission and the like. The light sources are divided into edge light type and direct type (bottom backlight type) according to their distribution positions. With the development of the display module towards brighter, lighter and thinner, the edge-type backlight module has become the mainstream of the development of the backlight module.
The side-light type backlight module is a single light source with light sources arranged on the side, the light guide plate is in an injection molding non-printing design, and is generally commonly used in the backlight module with the medium size or the small size below 30 inches, the side-light type backlight module adopts a side-incident light source design, has the characteristics of light weight, thinness, narrow frame and low power consumption, is mainly used as the light source of mobile phones, tablet computers and notebook computers, and also has a side-light type structure adopted by large-size television backlight modules.
As shown in fig. 1 and 2, the positions of the light sources of the conventional edge-lit backlight module are shown, the light sources 1 of the conventional edge-lit backlight module are all disposed on one side of the light guide plate 2, and as shown in fig. 2, the bottom surface of the light guide plate 2 is designed to be inclined, so that the light reflection efficiency can be improved.
However, the conventional edge-type backlight module has many disadvantages in implementation, firstly, the light source 1 is disposed at one side of the light guide plate 2, so that the light source and the light guide plate are not aligned correctly during assembly, secondly, the light source 1 is disposed at one side of the light guide plate 2, so that light leakage often occurs between the light source and the light guide plate, and thirdly, a gap generally exists between the light source 1 and the light guide plate 2, so that the light of the light source 1 cannot enter the light guide plate 2 completely. As described above is a major drawback of the conventional technology.
Disclosure of Invention
The technical scheme adopted by the invention is as follows: a production method of a display screen backlight module is characterized by comprising the following steps.
The method comprises the following steps of manufacturing a bottom cover, and overlapping a light reflecting plate and a light guide plate in a bottom cover cavity of the bottom cover, wherein the light guide plate is arranged above the light reflecting plate.
The light guide plate is provided with an inclined light incoming surface, the inclined light incoming surface is positioned at one side end part of the light guide plate, a positioning inclined surface is arranged on the side wall of the bottom cover, and a positioning cavity is formed by the inclined light incoming surface of the light guide plate and the positioning inclined surface of the bottom cover in a surrounding mode.
And the second step, manufacturing the light source body.
The light source body comprises a circuit board, LED light sources and a positioning optical block, wherein the LED light sources are connected to the circuit board, and the positioning optical block is covered on the circuit board, so that the LED light sources are covered in the positioning optical block.
The positioning optical block is provided with a light source cavity, an optical lens unit is arranged in the light source cavity, a plurality of LED light sources are arranged in the light source cavity, each LED light source corresponds to the optical lens unit, and the positioning optical block is also provided with a light emergent surface, an outer side positioning surface and an inner side positioning surface.
And thirdly, assembling the light source body in the bottom cover, and performing first assembling and positioning on the light source body.
Assembling the light source body in the second step into the positioning cavity in the first step to make the light emergent surface of the positioning optical block contact with the inclined light incident surface of the light guide plate, after the third step of assembly, the light source body is obliquely arranged above one side end part of the light guide plate, at this moment, the light emergent surface of the positioning optical block contacts with the inclined light incident surface of the light guide plate, and the outer positioning surface of the positioning optical block contacts with the positioning inclined surface of the bottom cover.
And fourthly, assembling a pressing block, and performing second assembling and positioning on the light source body.
The press block is provided with a side pressure surface, a vertical side surface and a press block bottom surface, and is assembled on one side of the light source body, so that the side pressure surface is pressed on the inner side positioning surface of the positioning optical block, and the press block bottom surface is pressed on the top surface of the light guide plate.
And fifthly, assembling the heat dissipation positioning strip and the top cover, and performing third assembling positioning on the light source body.
The fifth step is carried out according to the following steps: step A, pressing the heat dissipation positioning strip above the light source body, step B, covering the top cover above the heat dissipation positioning strip, and step C, connecting and fixing the top cover and the bottom cover together.
And sixthly, assembling a light film layer, namely arranging the light film layer above the light guide plate, and butting the end part of one side of the light film layer on the vertical side face of the pressing block.
And seventhly, assembling a gland, namely pressing the gland above the top cover and the optical film layer to fix the top cover and the optical film layer.
The invention has the beneficial effects that: the production method is simple and reliable, and can realize inclined positioning and fixing of the light source through a simple structure. Meanwhile, the positioning optical block is introduced to firstly improve the light efficiency and avoid light leakage, and meanwhile, the positioning and fixing effects on the light source body can be achieved. The design mode of the invention can be used for manufacturing the light source body by utilizing the traditional light source, thereby greatly reducing the product cost. When the product produced by the method works, a plurality of LED light sources are electrified to emit light, and the emitted light penetrates through the optical lens unit, sequentially penetrates through the light emitting surface and the inclined light incident surface and then irradiates into the light guide plate, so that the aim of guiding the light source light into the light guide plate is fulfilled.
Drawings
Fig. 1 is a schematic structural diagram of a first prior art.
Fig. 2 is a schematic structural diagram of a second prior art.
Fig. 3 is a schematic assembly flow diagram of the present invention.
Fig. 4 is an exploded view of the present invention.
FIG. 5 is a top view of a first embodiment of a positioning optics block of the present invention.
FIG. 6 is a perspective cross-sectional view of a second embodiment of a positioning optics block of the present invention.
FIG. 7 is a schematic diagram of a non-light source end of the backlight module according to the present invention.
Detailed Description
As shown in fig. 3 to 4, a method for manufacturing a backlight module of a display panel includes the following steps.
First, a bottom cover 100 is manufactured, a light reflecting plate 200 and a light guiding plate 300 are stacked in a bottom cover cavity of the bottom cover 100, and the light guiding plate 300 is disposed above the light reflecting plate 200.
The light guide plate 300 has an inclined light incident surface 310. The inclined light incident surface 310 is located at one side end of the light guide plate 300.
The sidewall of the bottom cover 100 is provided with a positioning inclined surface 110, and a positioning cavity a is formed by the inclined light incident surface 310 of the light guide plate 300 and the positioning inclined surface 110 of the bottom cover 100.
Second, the light source body 400 is manufactured.
The light source body 400 includes a circuit board 410, an LED light source 420, and a positioning optical block 430.
The LED light sources 420 are connected to the circuit board 410, and the positioning optical block 430 is covered on the circuit board 410, so that the LED light sources 420 are covered in the positioning optical block 430.
The positioning optical block 430 has a light source cavity 440, and an optical lens unit 450 is disposed in the light source cavity 440. Several LED light sources 420 are disposed in the light source cavity 440 such that each of the LED light sources 420 corresponds to the optical lens unit 450.
The positioning optical block 430 further has a light emitting surface 431, an outer positioning surface 432, and an inner positioning surface 433.
Third, the light source body 400 is assembled in the bottom cover 100, and the first assembling and positioning of the light source body 400 is performed.
The light source body 400 in the second step is assembled in the positioning cavity a in the first step, so that the light emitting surface 431 of the positioning optical block 430 is butted on the inclined light incident surface 310 of the light guide plate 300.
After the third step of assembly, the light source body 400 is obliquely disposed above one side end of the light guide plate 300, at this time, the light emitting surface 431 of the positioning optical block 430 is abutted on the oblique light incident surface 310 of the light guide plate 300, and the outer positioning surface 432 of the positioning optical block 430 is abutted on the positioning inclined surface 110 of the bottom cover 100.
And fourthly, assembling the pressing block 500 to perform second assembling and positioning on the light source body 400.
The pressing block 500 has a lateral pressure surface 510, a vertical side surface 520, and a pressing block bottom surface 530, and the pressing block 500 is assembled at the light source body 400 side such that the lateral pressure surface 510 is pressed against the inner positioning surface 433 of the positioning optical block 430 and the pressing block bottom surface 530 is pressed against the top surface of the light guide plate 300.
And fifthly, assembling the heat dissipation positioning bars 600 and the top cover 700, and performing third assembling positioning on the light source body 400.
The fifth step is performed according to the following steps.
Step a, the heat dissipation positioning bar 600 is pressed above the light source body 400.
Step B, covering the top cover 700 above the heat dissipation positioning strip 600.
And step C, connecting and fixing the top cover 700 and the bottom cover 100 together.
In practice, the top cover 700 and the bottom cover 100 may be fixed together by gluing, welding, or the like.
Sixth, light film layer 800 is assembled.
The optical film layer 800 is disposed above the light guide plate 300 such that one side end of the optical film layer 800 abuts against the vertical side 520 of the pressing block 500.
Seventh, the gland 900 is assembled.
The cover 900 is pressed over the top cover 700 and the optical film layer 800 to fix the top cover 700 and the optical film layer 800.
As mentioned above, the assembling process and the assembling structure of the light source end of the backlight module are described, and the structure of the other end is the prior art, which is not described herein again, and as shown in fig. 7, is a schematic structure of the other end of the backlight module.
The production method is simple and reliable, and can realize inclined positioning and fixing of the light source through a simple structure, in addition, the product produced by the method creatively introduces the design idea of inclined light incidence, and the size of the light incidence surface can be greatly expanded by opening up the inclined light incidence surface 310 of the light guide plate 300, so that the light incidence efficiency is improved. Meanwhile, the positioning optical block 430 is introduced to firstly improve the light efficiency and avoid light leakage, and simultaneously, the positioning and fixing effects on the light source body 400 can be achieved. The light source body 400 can be manufactured by using a conventional light source by using the design method of the present invention, so that the product cost can be greatly reduced.
When the product produced by the method of the present invention works, the LED light sources 420 are energized to emit light, and the emitted light passes through the optical lens unit 450, sequentially passes through the light emitting surface 431 and the inclined light incident surface 310, and then is irradiated into the light guide plate 300, so as to achieve the purpose of guiding the light source light into the light guide plate.
With the continuous promotion of the requirement of the lightness and thinness of digital products, the thickness of the light guide plate is gradually reduced, and meanwhile, the material cost of the product can be reduced by reducing the thickness of the light guide plate. The light guide plate has reduced thickness and gradually reduced side width, and the light source is connected to the side of the light guide plate in the prior art, and the reduced side width can reduce the incident light angle gradually, which can reduce the incident light efficiency and increase the light leakage. In order to avoid the above situation, reducing the size of the light source becomes the only solution, but the LED with small light source will greatly increase the cost of the product. The technical problems of the prior art can be solved by utilizing the design idea of the invention.
In a specific implementation, in the first step, an included angle between the light incident surface 310 and the bottom surface of the light guide plate 300 is eighty degrees to twenty degrees.
In a second step, the optical lens unit 450 is integrally connected to the positioning optical block 430 to facilitate processing, and in practice, the positioning optical block 430 may be produced by integrally molding.
As shown in fig. 5, in a top view of the positioning optical block 430, the optical lens unit 450 includes a plurality of lenses 421, and the lenses 421 correspond to the LED light sources 420 in a one-to-one manner.
As shown in fig. 6, which is a perspective cross-sectional view of the positioning optical block 430, the optical lens unit 450 is a strip lens 423, the strip lens 423 is disposed in the light source cavity 440 in a penetrating manner, and the plurality of LED light sources 420 correspond to the strip lens 423 at the same time, which can reduce the production cost.
In the fifth step, the heat dissipation positioning strip 600 is made of a material with good thermal conductivity, such as: heat conductive silica gel, a resin material in which heat conductive powder is mixed, and the like.
The heat-dissipating positioning strip 600 has an inclined pressing surface 610, and the inclined pressing surface 610 is pressed on the circuit board 410.
The top cover 700 is made of a heat dissipating material, such as metallic aluminum, copper, or the like.
The top cover 700 is fastened above the bottom cover 100, and meanwhile, the top cover 700 is pressed on the heat dissipation positioning strip 600.
In operation, heat generated by the circuit board 410 is first conducted to the heat-dissipating positioning bar 600, and then dissipated outward through the top cover 700.
The heat dissipation positioning bar 600 and the top cover 700 of the present invention can achieve the positioning function for the light source body 400, and can achieve the heat dissipation function for the light source body 400.
In the sixth step, the light film layer 800 mainly functions to equalize light and improve light efficiency, and the light film layer 800 is not described again in the prior art.
In practice, light film layer 800 can include a diffuser layer, an upper antireflective coating layer, and a lower antireflective coating layer, and light film layer 800 can also include a diffuser layer, a prism layer, and an antireflective coating layer.
In practical applications, the positioning inclined surfaces 110 and the side pressing surfaces 510 are provided with light reflecting layers.
The reflective layer may be formed by disposing reflective material on the inclined positioning surface 110 and the lateral pressing surface 510 by sputtering or plating.
The light leakage of the light source 400 can be prevented by the reflective layer on the inclined positioning surface 110 and the lateral pressing surface 510, and the light incident effect can be improved.
In specific implementation, a pressing block reflective layer is disposed on the pressing block bottom surface 530 of the pressing block 500, the pressing block reflective layer is parallel to the light reflective plate 200, and the pressing block reflective layer can prevent the light source 400 from leaking light and is beneficial to enhancing the light incident effect.
In an embodiment, the top of the sidewall of the bottom cover 100 is provided with a first inclined fastening surface 120.
The bottom of the sidewall of the top cover 700 is provided with a second inclined fastening surface 720, and the second inclined fastening surface 720 is connected to the first inclined fastening surface 120 in a pressing manner.
In practice, the second inclined fastening surface 720 can be press-fit connected to the first inclined fastening surface 120 by gluing, microwave welding, or the like.
In addition, the oblique connection manner of the first oblique fastening surface 120 and the second oblique fastening surface 720 can facilitate the butt-joint assembly, and simplify the structure and the production process.
Claims (10)
1. A production method of a display screen backlight module is characterized by comprising the following steps:
the first step is to make a bottom cover, to stack a light reflection plate and a light guide plate in a bottom cover cavity of the bottom cover, the light guide plate is arranged above the light reflection plate,
the light guide plate is provided with an inclined light incident surface which is positioned at one side end part of the light guide plate, the side wall of the bottom cover is provided with a positioning inclined surface, a positioning cavity is formed by the inclined light incident surface of the light guide plate and the positioning inclined surface of the bottom cover,
the second step is to manufacture the light source body,
the light source body comprises a circuit board, LED light sources and a positioning optical block, wherein the LED light sources are connected on the circuit board, the positioning optical block is covered on the circuit board, so that the LED light sources are covered in the positioning optical block,
the positioning optical block has a light source cavity, an optical lens unit is disposed in the light source cavity, a plurality of LED light sources are disposed in the light source cavity such that each LED light source corresponds to the optical lens unit,
the positioning optical block also has a light-emitting surface, an outer positioning surface and an inner positioning surface,
thirdly, the light source body is assembled in the bottom cover, the first assembling and positioning are carried out on the light source body,
assembling the light source body in the second step in the positioning cavity in the first step to make the light emergent surface of the positioning optical block contact with the inclined light incident surface of the light guide plate,
after the assembly of the third step is completed, the light source body is obliquely arranged above the end part at one side of the light guide plate, at the moment, the light emitting surface of the positioning optical block is in butt joint with the oblique light incoming surface of the light guide plate, the outer side positioning surface of the positioning optical block is in butt joint with the positioning inclined surface of the bottom cover,
fourthly, assembling a pressing block, carrying out second assembling and positioning on the light source body,
the press block is provided with a side press surface, a vertical side surface and a press block bottom surface, the press block is assembled at one side of the light source body, so that the side press surface is pressed on the inner side positioning surface of the positioning optical block, the press block bottom surface is pressed on the top surface of the light guide plate,
fifthly, assembling the heat dissipation positioning strips and the top cover, performing third assembling and positioning on the light source body,
the fifth step is carried out according to the following steps:
step A, pressing the heat dissipation positioning strip on the upper side of the light source body,
step B, covering the top cover above the heat dissipation positioning strip,
step C, connecting and fixing the top cover and the bottom cover together,
sixthly, assembling an optical film layer, arranging the optical film layer above the light guide plate, butting one side end part of the optical film layer on the vertical side surface of the pressing block,
and seventhly, assembling a gland, namely pressing the gland above the top cover and the optical film layer to fix the top cover and the optical film layer.
2. The method for manufacturing a backlight module for a display screen of claim 1, wherein: in a second step, the optical lens unit is integrally connected to the positioning optics block.
3. The method for manufacturing a backlight module for a display screen according to claim 2, wherein: the optical lens unit comprises a plurality of lenses, and the lenses correspond to the LED light sources one to one.
4. The method for manufacturing a backlight module for a display screen of claim 2, wherein: the optical lens unit is a strip lens which is arranged in the light source cavity in a penetrating mode, and the LED light sources correspond to the strip lens at the same time.
5. The method for manufacturing a backlight module for a display screen of claim 1, wherein: in the fifth step, the heat dissipation positioning strip is made of a heat conduction material, the heat dissipation positioning strip is provided with an inclined pressing surface, the inclined pressing surface is pressed on the circuit board, the top cover is made of a heat dissipation material, the top cover is buckled above the bottom cover, meanwhile, the top cover is pressed on the heat dissipation positioning strip, heat generated by the circuit board is firstly conducted to the heat dissipation positioning strip, and then the heat is dissipated outwards through the top cover.
6. The method for manufacturing a backlight module for a display screen of claim 1 or 5, wherein: the positioning inclined surface and the side pressing surface are provided with reflecting layers, the bottom surface of the pressing block is provided with a pressing block reflecting layer, and the pressing block reflecting layer is parallel to the light reflecting plate.
7. The method for manufacturing a backlight module for a display screen of claim 6, wherein: the reflecting layer is formed on the positioning inclined surface and the side pressing surface in a sputtering or film coating mode, and the briquetting reflecting layer is formed on the bottom surface of the briquetting in a sputtering or film coating mode.
8. The method for manufacturing a backlight module for a display screen of claim 1, wherein: the top of the side wall of the bottom cover is provided with a first inclined buckling surface, the bottom of the side wall of the top cover is provided with a second inclined buckling surface, and the second inclined buckling surface is connected to the first inclined buckling surface in a pressing mode.
9. The method for manufacturing a backlight module for a display screen of claim 8, wherein: the second inclined buckling surface is connected to the first inclined buckling surface in a pressing mode through gluing.
10. The method for manufacturing a backlight module for a display screen of claim 8, wherein: the second inclined buckling surface is connected to the first inclined buckling surface in a pressing mode in a microwave welding mode.
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| CN202210531247.0A CN114624811B (en) | 2022-05-17 | 2022-05-17 | Production method of display screen backlight module |
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| CN202210531247.0A CN114624811B (en) | 2022-05-17 | 2022-05-17 | Production method of display screen backlight module |
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