CN216561316U - Large-size liquid crystal display backlight module - Google Patents
Large-size liquid crystal display backlight module Download PDFInfo
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- CN216561316U CN216561316U CN202123185841.9U CN202123185841U CN216561316U CN 216561316 U CN216561316 U CN 216561316U CN 202123185841 U CN202123185841 U CN 202123185841U CN 216561316 U CN216561316 U CN 216561316U
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Abstract
The utility model discloses a large-size liquid crystal display backlight module, which comprises an LED backlight strip, a heat dissipation plate, a metal bottom plate, a light guide plate, reflective paper arranged on the lower surface of the light guide plate, an x ︒ prism film, an (x +90) ︒ prism film, a polarization brightness enhancement film, an x ︒ prism film, an (x +90) ︒ prism film and an ear structure of the polarization brightness enhancement film, wherein the ear structures are arranged in a staggered manner with the ear structure of the light guide plate. In the backlight module provided by the utility model, a diffusion film is omitted, the light guide plate and the optical film group are fixed in a three-point floating mode and are fixed in a staggered mode, the temperature expansion and vibration performance is considered, and the backlight module can solve the problems that the optical film is wrinkled or vibrated and abraded after a liquid crystal display is tested in high and low temperature and severe vibration or works in a severe environment for a period of time. The utility model can ensure that the display quality and the backlight power consumption are not changed under the condition of not reducing the brightness enhancement capability of the backlight module, and the overall dimension and the weight of the liquid crystal display are rarely increased.
Description
Technical Field
The utility model relates to a large-size liquid crystal display backlight module, and belongs to the technical field of liquid crystal display.
Background
As is well known, various electronic devices such as liquid crystal displays may work in high temperature, low temperature, strong vibration and other working environments, and the problem of adapting to high and low temperature and strong vibration environments is proposed in the current liquid crystal displays, both in vehicles for civil use and in special fields, and the size of the liquid crystal display for intelligent display has reached more than 65 inches, so that the size of the backlight module applied to the liquid crystal display is increased, and therefore, the anti-wrinkle and anti-vibration wear technology of the large-size backlight module becomes one of the important technologies for strengthening the environmental adaptability of the large-size liquid crystal display.
At present, crease-resistant and anti-vibration wear of jumbo size backlight unit is comparatively reliable effectual have two kinds of technologies: one technique is to fix the multilayer optical film group into an integrated module by sandwiching it with a transparent glass plate, and the other technique is to use a diffusion plate instead of a diffusion film and to bond other optical films transparently into an integrated module. The integrated module formed by clamping and fixing the optical film group by the transparent glass plate has the advantages of little optical efficiency loss and less complex process; the disadvantages are increased thickness and weight of the backlight module and higher cost. The diffusion plate is adopted to replace the diffusion film and other optical films are transparently pasted to form an integrated module, and because it is difficult to paste all normally configured brightening optical films, the brightening proportion of the backlight module is reduced, the brightness of a display screen can be greatly reduced, or the backlight power consumption is increased; the process difficulty of sticking the optical film is high, the requirement on the process environment is high, and the manufacturing cost is high. How to realize a large-sized liquid crystal display backlight module with low cost, simple manufacture and lightness and thinness is a problem to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the backlight module of the large-size liquid crystal display solves the problems of wrinkling and vibration abrasion of the optical film of the backlight optical film of the large-size liquid crystal display after a test of high and low temperature and strong vibration or a period of actual severe environment work.
The utility model adopts the following technical scheme for solving the technical problems:
a large-size liquid crystal display backlight module comprises an LED backlight strip, a heat dissipation plate, a metal bottom plate, a light guide plate, reflective paper arranged on the lower surface of the light guide plate, and an x-degree prism film, an (x +90) degree prism film and a polarized light brightness enhancement film which are sequentially arranged on the upper surface of the light guide plate, wherein x is a positive integer, the positions of ear structures of the x-degree prism film, the (x +90) degree prism film and the polarized light brightness enhancement film are the same, and the ear structures of the x-degree prism film and the ear structures of the light guide plate are staggered;
the light guide plate, the x-degree prism film, the (x +90) degree prism film and the polarized light brightness enhancement film are respectively provided with 2 ear structures at the left side and the right side of the short side, and 3 ear structures are arranged at the opposite side of the backlight of the long side;
the middle of each ear structure at the left side and the right side of the short edge of the x-degree prism film, the (x +90) degree prism film and the polarized light brightness enhancement film is provided with a strip-shaped positioning groove, the strip-shaped positioning grooves at the same side are mutually vertical, and the long edge direction of the strip-shaped positioning groove close to the backlight side is parallel to the arrangement direction of the LED backlight strips;
the middle of each ear structure on the long edge of the backlight edge of the x-degree prism film, the (x +90) degree prism film and the polarized light brightness enhancement film is provided with a strip-shaped positioning groove, the strip-shaped positioning groove of the middle ear structure is mutually vertical to the strip-shaped positioning grooves of the ear structures on the left side and the right side of the middle ear structure, and the long edge direction of the strip-shaped positioning groove of the middle ear structure is vertical to the arrangement direction of the LED backlight strips;
the metal bottom plate is provided with a positioning matching part corresponding to the ear structures of the light guide plate, the x-degree prism film, the (x +90) degree prism film and the polarized light brightness enhancement film, and the positioning matching part is a positioning groove;
the metal base plate is provided with a positioning matching part corresponding to the elongated positioning groove of the ear structure of the x-degree prism film, the (x +90) degree prism film and the polarized light brightness enhancement film, and the positioning matching part is a positioning bulge;
in the ear structures at the left side and the right side of the short edge of the light guide plate, the ear structure close to the backlight edge is strictly limited with the positioning groove corresponding to the metal bottom plate, and the gap is 0.3 +/-0.2 mm; the ear structure far away from the backlight edge is not strictly limited with the positioning groove corresponding to the metal bottom plate, and the gap is 2 +/-1 mm;
in the 3 ear structures on the long edge of the backlight opposite side of the light guide plate, the middle ear structure is strictly limited with the positioning groove corresponding to the metal bottom plate, and the gap is 0.3 +/-0.2 mm; the ear structures on the left and right sides of the metal base plate are not strictly limited with the positioning grooves corresponding to the metal base plate, and the gap is 2 +/-1 mm;
in the ear structures at the left and right sides of the short sides of the x-degree prism film, the (x +90) -degree prism film and the polarized light brightness enhancement film, the ear structure close to the backlight side is strictly limited with the positioning groove corresponding to the metal base plate, the gap is 0.3 +/-0.2 mm, the long side of the strip-shaped positioning groove of the ear structure is strictly limited with the positioning protrusion of the metal base plate, the gap is 0.3 +/-0.2 mm, the short side of the strip-shaped positioning groove of the ear structure is not strictly limited with the positioning protrusion corresponding to the metal base plate, and the gap is 2 +/-1 mm; the ear structure far away from the backlight edge is not strictly limited with the positioning groove corresponding to the metal bottom plate, the gap is 2 +/-1 mm, the long strip-shaped positioning groove of the ear structure is not strictly limited with the positioning bulge corresponding to the metal bottom plate, and the gap is 2 +/-1 mm;
in 3 ear structures on the long edge of the backlight side of the x-degree prism film, the (x +90) ° prism film and the polarized light brightness enhancement film, the middle ear structure is strictly limited with the positioning groove corresponding to the metal base plate, the gap is 0.3 +/-0.2 mm, the long edge of the long strip-shaped positioning groove of the ear structure is strictly limited with the positioning bulge corresponding to the metal base plate, the gap is 0.3 +/-0.2 mm, the short edge of the long strip-shaped positioning groove of the ear structure is not strictly limited with the positioning bulge corresponding to the metal base plate, and the gap is 2 +/-1 mm; the ear structures on the left side and the right side of the metal base plate are not strictly limited by the positioning grooves corresponding to the metal base plate, the gap is 2 +/-1 mm, the long strip-shaped positioning grooves of the ear structures are not strictly limited by the positioning protrusions corresponding to the metal base plate, and the gap is 2 +/-1 mm.
As a preferred embodiment of the present invention, the light guide plate has a microstructure on an upper surface thereof and a light guide point on a lower surface thereof.
As a preferred scheme of the present invention, the left and right sides of the short side of the light guide plate and the side surfaces of the opposite side of the backlight are fixedly bonded to the metal base plate through segmented point silica gel, and the shore hardness of the silica gel is 20A to 80A.
In a preferred embodiment of the present invention, the ear structures of the x ° prism film, the (x +90) ° prism film, and the polarized light enhancement film are fixed by an OCA adhesive or a double-sided tape.
As a preferable scheme of the utility model, the LED backlight strip is formed by splicing 3 or more than 3 same backlight strips, the heat dissipation plate and the LED backlight strip are adhered by a heat conduction adhesive tape, the LED backlight strip and the heat dissipation plate are fixed on the side surface of the long-side backlight edge of the metal base plate, and the heat dissipation plate is provided with heat dissipation fins.
As a preferable scheme of the present invention, the heat dissipation plate is provided with a positioning matching portion between the backlight bar and the backlight bar, the positioning matching portion is a positioning protrusion, and the height of the positioning protrusion is 0.3 ± 0.2mm higher than the LED height of the LED backlight bar.
Compared with the prior art, the utility model adopting the technical scheme has the following technical effects:
1. in the backlight module provided by the utility model, the upper surface of the light guide plate is provided with the microstructure, the lower surface of the light guide plate is provided with the light guide points, the backlight module has light guide and diffusion integrated functions, a diffusion film is omitted, the light guide plate and the optical film group are fixed in a three-point floating mode and are fixed in a staggered mode respectively, the light guide plate and the optical film group are limited by the ear structures and the metal base plate, the elongated positioning grooves of the ear structures of the optical film group and the positioning protrusions of the metal base plate are limited, the light guide plate and the optical module are arranged in a strict limiting mode and a non-strict limiting mode, and the temperature expansion and vibration performance are considered.
2. The backlight module provided by the utility model has the advantages of low cost, simple manufacture, light weight and the like.
3. The utility model can ensure that the display quality and the backlight power consumption of the liquid crystal display are not changed under the condition of not reducing the brightness enhancement capability of the backlight module, and the overall dimension and the weight of the liquid crystal display are rarely increased.
Drawings
FIG. 1 is a top view of a large-sized LCD backlight module according to the present invention;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of an optical film construction;
FIG. 4 is a schematic view of a light guide plate structure.
The LED backlight module comprises an 11-LED backlight strip, a 12-radiating plate, a 13-metal bottom plate, a 14-light guide plate, 15-reflective paper, a 16-x-degree prism film, a 17- (x +90) degree prism film and an 18-polarized brightness enhancement film.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a top view of an embodiment of a backlight module provided by the present invention, and fig. 2 is a schematic sectional view taken along line a-a of fig. 1. As shown in fig. 1 and fig. 2, the present invention provides a large-sized lcd backlight module, which comprises LED backlight bars 11, a heat dissipation plate 12, a metal base plate 13, a light guide plate 14, a reflective paper 15, a 0 ° prism film 16, a 90 ° prism film 17, and a polarization brightness enhancement film 18.
The LED backlight bar 11 is disposed on a side surface of the light guide plate 14, the light reflecting paper 15 is disposed on a lower surface side of the light guide plate 14, the 0 ° prism film 16 is disposed on an upper surface side of the light guide plate 14, the 90 ° prism film 17 is disposed on an upper surface side of the 0 ° prism film 16, and the polarization enhancement film 18 is disposed on an upper surface side of the 90 ° prism film 17. A metal chassis 13 is provided on the outer side of each optical component for fixing each optical component.
The upper surface of the light guide plate is provided with the microstructures, and the lower surface of the light guide plate is provided with the light guide points, so that the light guide plate has the integrated functions of light guide and diffusion, and a diffusion film is omitted; the 0 ° prism film and the 90 ° prism film may be prism films of other angles as long as the angles between the two are ensured to be perpendicular to each other.
The heat dissipation plate 12 and the LED backlight strip 11 are adhered through a heat conduction adhesive tape; the LED backlight strip 11 is formed by splicing 3 or more than 3 same backlight strips, and the length of a single backlight and deformation and warping caused by overlong length are reduced. The LED backlight bar 11 and the heat dissipation plate 12 are fixed on the long-side backlight side of the metal base plate 13. The heat dissipation plate 12 is provided with heat dissipation fins. The heat dissipation plate 12 is provided with a positioning matching portion between the backlight bar and the backlight bar, the positioning matching portion is a positioning protrusion, the height of the positioning protrusion is 0.3 +/-0.2 mm higher than that of an LED of the LED backlight bar, and the light guide plate can be prevented from colliding with an LED lamp bead to cause the LED lamp bead to be damaged.
The metal bottom plate is provided with a positioning matching part corresponding to the ear structures of the light guide plate, the 0-degree prism film, the 90-degree prism film and the polarized light brightness enhancement film, and the positioning matching part is a positioning groove; the metal bottom plate is provided with a positioning matching part corresponding to the middle strip-shaped positioning groove of the ear structure of the 0-degree prism film, the 90-degree prism film and the polarized brightness enhancement film, and the positioning matching part is a positioning bulge.
As shown in fig. 3, the 0 ° prism film 16, the 90 ° prism film 17, and the polarization enhancement film 18 have 2 ear structures on the right and left sides of the short side, respectively, and 3 ear structures on the long side of the backlight opposite side. The middle of 2 ear structures on both sides about 0 prism membrane 16, 90 prism membrane 17, polarisation brightness enhancement film 18 minor face has rectangular shape constant head tank, and rectangular shape constant head tank mutually perpendicular with one side, and the rectangular shape constant head tank long edge direction that is close to the back light limit is parallel with LED 11 array orientation in a poor light. 0 prism film 16, 90 prism film 17, polarisation brightness enhancement film 18 are shaded in the middle of 3 ear structures on opposite side long edge and are had rectangular shape constant head tank, and the rectangular shape constant head tank of middle ear structure is mutually perpendicular with the rectangular shape constant head tank of the ear structure of both sides about it, and the rectangular shape constant head tank long edge direction of middle ear structure is perpendicular with 11 array directions in a poor light of LED.
As shown in fig. 3, there are 2 ear structures on both sides about 0 degree prism membrane 16, 90 degree prism membrane 17, polarisation brightness enhancement film 18 minor face, ear structure and metal soleplate 13 constant head tank close to the backlight limit are strict spacing, clearance 0.3 ± 0.2mm, and the long limit of rectangular shape constant head tank and metal soleplate 13 location arch of ear structure are strict spacing, clearance 0.3 ± 0.2mm, the protruding nonconstrictive spacing of rectangular shape constant head tank minor face and metal soleplate 13 location of ear structure, clearance 2 ± 1mm, the ear structure and metal soleplate 13 constant head tank nonconstrictive spacing of the ear structure of keeping away from the backlight limit are nonconstrictive spacing, clearance 2 ± 1mm, the protruding nonconstrictive spacing of rectangular shape constant head tank and metal soleplate 13 location of ear structure, clearance 2 ± 1 mm.
0 prism membrane 16, 90 prism membrane 17, 3 ear structures on the opposite side long limit are shaded to polarisation brightness enhancement film 18, middle ear structure is strict spacing with 13 constant head tank of metal soleplate, clearance 0.3 + -0.2 mm, and the long limit of rectangular shape constant head tank of ear structure is strict spacing with 13 constant head tank location of metal soleplate, clearance 0.3 + -0.2 mm, the protruding non-strict spacing in rectangular shape constant head tank minor face and 13 constant head tank location of metal soleplate of ear structure, clearance 2 + -1 mm, it is not strict spacing with 13 constant head tank of metal soleplate to control both sides ear structure, clearance 2 + -1 mm, the protruding non-strict spacing in rectangular shape constant head tank and 13 constant head tank location of metal soleplate of ear structure, clearance 2 + -1 mm.
The ear structures of the 0-degree prism film 16, the 90-degree prism film 17 and the polarized light brightness enhancement film 18 are adhered and fixed through OCA glue or double-sided adhesive tape.
As shown in fig. 4, the light guide plate 14 has 2 ear structures on the right and left sides of the short side, and 3 ear structures on the long side of the backlight opposite side. The left and right sides of the short edge of the light guide plate 14 and the side faces of the opposite side of the backlight are fixedly bonded with the metal base plate 13 through segmented point silica gel, and the Shore hardness of the silica gel is 20-80A.
The light guide plate 14 is shifted from the ear structures of the 0 ° prism film 16, the 90 ° prism film 17, and the polarized light enhancement film 18. The left side and the right side of the short edge of the light guide plate 14 are respectively provided with 2 ear structures, the ear structure close to the backlight edge is strictly limited with the positioning groove of the metal bottom plate 13, the gap is 0.3 +/-0.2 mm, the ear structure far away from the backlight edge is not strictly limited with the positioning groove of the metal bottom plate 13, and the gap is 2 +/-1 mm; the light guide plate 14 is shaded to 3 ear structures on the long edge, the middle ear structure and the metal bottom plate 13 positioning groove are strictly limited, the gap is 0.3 +/-0.2 mm, the ear structures on the left side and the right side and the metal bottom plate 13 positioning groove are not strictly limited, and the gap is 2 +/-1 mm.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (6)
1. The large-size liquid crystal display backlight module is characterized by comprising an LED backlight strip (11), a heat dissipation plate (12), a metal base plate (13), a light guide plate (14), reflective paper (15) arranged on the lower surface of the light guide plate (14), and further comprising an x-degree prism film (16), an x + 90-degree prism film (17) and a polarized light brightness enhancement film (18) which are sequentially arranged on the upper surface of the light guide plate (14), wherein x is a positive integer, the positions of ear structures of the x-degree prism film (16), the x + 90-degree prism film (17) and the polarized light brightness enhancement film (18) are the same, and the ear structures of the x-degree prism film (16) and the ear structures of the light guide plate (14) are arranged in a staggered manner;
the light guide plate (14), the x-degree prism film (16), the (x +90) degree prism film (17) and the polarized light brightness enhancement film (18) are respectively provided with 2 ear structures at the left side and the right side of the short side, and 3 ear structures are arranged at the opposite side of the long side in a backlight mode;
the middle of each ear structure at the left side and the right side of the short edge of the x-degree prism film (16), (x +90) degree prism film (17) and the polarized light brightness enhancement film (18) is provided with a strip-shaped positioning groove, the strip-shaped positioning grooves at the same side are mutually vertical, and the long side direction of the strip-shaped positioning groove close to the backlight side is parallel to the arrangement direction of the LED backlight strips (11);
the middle of each ear structure of the long edge of the backlight opposite side of the x-degree prism film (16), (x +90) degree prism film (17) and the polarized light brightness enhancement film (18) is provided with a strip-shaped positioning groove, the strip-shaped positioning groove of the middle ear structure is mutually vertical to the strip-shaped positioning grooves of the ear structures at the left side and the right side of the middle ear structure, and the long edge direction of the strip-shaped positioning groove of the middle ear structure is vertical to the arrangement direction of the LED backlight strips (11);
the metal bottom plate (13) is provided with a positioning matching part corresponding to the ear structures of the light guide plate (14), the x-degree prism film (16), (x +90) degree prism film (17) and the polarized light brightness enhancement film (18), and the positioning matching part is a positioning groove;
the metal base plate (13) is provided with a positioning matching part corresponding to the elongated positioning grooves of the ear structures of the x-degree prism film (16), (x +90) degree prism film (17) and the polarized light brightness enhancement film (18), and the positioning matching part is a positioning bulge;
among the ear structures on the left side and the right side of the short side of the light guide plate (14), the ear structure close to the backlight side is strictly limited with a positioning groove corresponding to the metal bottom plate (13), and the gap is 0.3 +/-0.2 mm; the ear structure far away from the backlight edge and the positioning groove corresponding to the metal bottom plate (13) are not limited strictly, and the gap is 2 +/-1 mm;
in the 3 ear structures on the long edge of the backlight opposite side of the light guide plate (14), the positioning grooves corresponding to the middle ear structure and the metal bottom plate (13) are strictly limited, and the gap is 0.3 +/-0.2 mm; the ear structures at the left and right sides of the metal base plate are not strictly limited with the positioning grooves corresponding to the metal base plate (13), and the gap is 2 +/-1 mm;
in the ear structures at the left and right sides of the short sides of the x-degree prism film (16), (x +90) ° prism film (17) and the polarized light brightness enhancement film (18), the ear structure close to the backlight side is strictly limited with the positioning groove corresponding to the metal bottom plate (13), the gap is 0.3 +/-0.2 mm, the long side of the long strip-shaped positioning groove of the ear structure is strictly limited with the positioning bulge of the metal bottom plate (13), the gap is 0.3 +/-0.2 mm, the short side of the long strip-shaped positioning groove of the ear structure is not strictly limited with the positioning bulge corresponding to the metal bottom plate (13), and the gap is 2 +/-1 mm; the ear structure far away from the backlight edge is not strictly limited with the positioning groove corresponding to the metal bottom plate (13), the gap is 2 +/-1 mm, the long strip-shaped positioning groove of the ear structure is not strictly limited with the positioning bulge corresponding to the metal bottom plate (13), and the gap is 2 +/-1 mm;
in 3 ear structures on the long edge of the backlight opposite side of the x-degree prism film (16), (x +90) ° prism film (17) and polarization brightness enhancement film (18), the middle ear structure is strictly limited with the positioning groove corresponding to the metal bottom plate (13), the gap is 0.3 +/-0.2 mm, the long edge of the long strip-shaped positioning groove of the ear structure is strictly limited with the positioning bulge corresponding to the metal bottom plate (13), the gap is 0.3 +/-0.2 mm, the short edge of the long strip-shaped positioning groove of the ear structure is not strictly limited with the positioning bulge corresponding to the metal bottom plate (13), and the gap is 2 +/-1 mm; the ear structures on the left side and the right side of the metal base plate are not strictly limited by the positioning grooves corresponding to the metal base plate (13), the gap is 2 +/-1 mm, the long strip-shaped positioning grooves of the ear structures are not strictly limited by the positioning protrusions corresponding to the metal base plate (13), and the gap is 2 +/-1 mm.
2. The large-sized LCD backlight module as claimed in claim 1, wherein the light guide plate (14) has microstructures on its upper surface and light guide dots on its lower surface.
3. The large-sized liquid crystal display backlight module according to claim 1, wherein the side surfaces of the short side, the left side and the right side of the light guide plate (14) and the side surfaces of the backlight opposite side are fixed to the metal base plate (13) by means of segmented point silica gel, and the shore hardness of the silica gel is 20A-80A.
4. The backlight module of claim 1, wherein the ear structures of the x ° prism film (16), (x +90) ° prism film (17) and the polarization brightness enhancement film (18) are fixed by OCA glue or double-sided tape.
5. The large-sized liquid crystal display backlight module according to claim 1, wherein the LED backlight bar (11) is formed by splicing 3 or more than 3 same backlight bars, the heat dissipation plate (12) and the LED backlight bar (11) are adhered by a heat conduction adhesive tape, the LED backlight bar (11) and the heat dissipation plate (12) are fixed on the long-side backlight side of the metal base plate (13), and the heat dissipation plate (12) is provided with heat dissipation fins.
6. The large-sized LCD backlight module according to claim 5, wherein the heat dissipation plate (12) is provided with a positioning matching part between the backlight bar and the backlight bar, the positioning matching part is a positioning protrusion, and the height of the positioning protrusion is 0.3 +/-0.2 mm higher than the LED height of the LED backlight bar (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123185841.9U CN216561316U (en) | 2021-12-17 | 2021-12-17 | Large-size liquid crystal display backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123185841.9U CN216561316U (en) | 2021-12-17 | 2021-12-17 | Large-size liquid crystal display backlight module |
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| Publication Number | Publication Date |
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| CN216561316U true CN216561316U (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123185841.9U Active CN216561316U (en) | 2021-12-17 | 2021-12-17 | Large-size liquid crystal display backlight module |
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| CN (1) | CN216561316U (en) |
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2021
- 2021-12-17 CN CN202123185841.9U patent/CN216561316U/en active Active
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