Super-condensation composite brightness enhancement film and liquid crystal display backlight module

Abstract

The invention discloses a super-condensation composite brightness enhancement film and a liquid crystal display backlight module, and particularly relates to the technical field of brightness enhancement films.The super-condensation composite brightness enhancement film comprises a core layer, an upper-layer brightness enhancement structure and a lower-layer brightness enhancement structure, the core layer is a multi-layer film made of poly (ethylene naphthalate) and a copolymer thereof, the upper-layer brightness enhancement structure is fixed to the top of the core layer, and the lower-layer brightness enhancement structure is fixed to the bottom of the core layer; the upper-layer brightening structure comprises a plurality of light gathering blocks, the light gathering blocks are distributed on the top of the core layer in a linear array mode, the light gathering blocks are arranged to be in a trapezoid quadrangular prism shape or a hexagonal pyramid shape, and the lower-layer brightening structure is fixed to the bottom of the core layer. The large-angle light of the incident surface is subjected to primary convergence through the plurality of inverse prism structures at the bottom of the core layer, and the large-angle light of the emergent surface is subjected to secondary convergence through the plurality of concave trapezoidal quadrangular prism-shaped or hexagonal pyramid-shaped light condensation blocks at the top of the core layer, so that the light loss is reduced, and the brightness of the backlight center is improved; and the hexagonal pyramid-shaped light condensation block can also improve the uniformity of the visual angle.

Description

Technical Field

[0001] The present invention relates to the technical field of brightness enhancement films, and more specifically to a super-concentrating composite brightness enhancement film and a liquid crystal display backlight module. Background Art

[0002] Conventional composite brightness enhancement films usually bond the atomized core layer and the prism sheet together with an adhesive. However, the preparation of this technology has problems such as high production cost, air pollution, easy damage to the surface of the core layer, and high assembly cost. A wide-view composite brightness enhancement film with the publication number CN221378289U in the prior art has a structure including three parts and bonding layers between the parts. The three parts are the upper, middle, and lower layers. The upper part is the core layer, the middle part is the transparent substrate layer, the lower part is the prism film layer, and there is bonding layer A between the upper and middle parts and bonding layer B between the middle and lower parts. Diffusion particles are present in bonding layer A.

[0003] Another example is a light-concentrating functional film with the publication number CN115267957A in the prior art, its preparation method and application. This film uses the core layer as the substrate, and a prism structure and a matte structure film are respectively arranged on its front and back surfaces. The prism structure film is composed of a plurality of prism structures arranged side by side, and the matte structure film is composed of a plurality of circular protrusions; the preparation raw materials of the prism structure film include liquid acrylic UV resin one; the preparation raw materials of the matte structure film include liquid acrylic UV resin two.

[0004] However, the above prior art still has the following problems when in use: 1. The light-gathering ability of the triangular prism structure is limited, resulting in light loss at large viewing angles, and poor picture uniformity and central brightness. 2. The use of multiple film sheets for lamination increases the cutting and assembly costs. Based on this, the present invention provides a super-concentrating composite brightness enhancement film and a liquid crystal display backlight module. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a super-concentrating composite brightness enhancement film and a liquid crystal display backlight module. By arranging a plurality of light-concentrating blocks in the shape of trapezoidal quadrangular prisms or hexagonal pyramids on the top of the core layer, the trapezoidal quadrangular prism-shaped light-concentrating blocks or the hexagonal pyramid-shaped light-concentrating blocks are compounded with the core layer and a plurality of inverse prism strips, and both can perform primary convergence and secondary convergence on the large-angle light entering from the incident surface and the exit surface, reduce light loss, improve the backlight central brightness, and the hexagonal pyramid-shaped light-concentrating blocks can also improve the uniformity of the viewing angle, so as to solve the problems appearing in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A super-concentrating composite brightness enhancement film, including a core layer, the thickness range of the core layer is 30 - 150 μm; an upper brightness enhancement structure, the upper brightness enhancement structure is fixed on the top of the core layer; a lower brightness enhancement structure, the lower brightness enhancement structure is fixed on the bottom of the core layer.

[0007] In a preferred embodiment, the thickness of the core layer is 40μm, 50μm, 60μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm.

[0008] In a preferred embodiment, the upper brightness enhancement structure includes a plurality of light condensing blocks, which are linearly arrayed on the top of the core layer. The light condensing blocks are set as concave trapezoidal prismatic or hexagonal pyramid structures.

[0009] In a preferred embodiment, the lower brightness enhancement structure includes a plurality of inverse prism strips, which are linearly arrayed on the bottom of the core layer and are used to improve light condensing property, thereby being able to play a role in brightness enhancement.

[0010] In a preferred embodiment, the material of the core layer is a multilayer film made of polyethylene terephthalate and its copolymers. Its optical structure can reflect the transmitted S light perpendicular to the transmission axis of the polarizer back, and then be reflected back by the reflector for reuse, increasing the number of P lights and improving the light utilization rate.

[0011] In a preferred embodiment, when each light condensing block is a trapezoidal prismatic shape, the trapezoidal prismatic light condensing block is recessed downward on the top of the core layer.

[0012] In a preferred embodiment, the trapezoidal prismatic light condensing block includes five first refracting surfaces, and the first refracting surfaces are used for refraction of light to concentrate the light and play a role in brightness enhancement.

[0013] In a preferred embodiment, when the bottom edge of each light condensing block is set as a hexagonal pyramid shape, the hexagonal pyramid-shaped light condensing block protrudes upward on the top surface of the core layer. The hexagonal pyramid-shaped light condensing block includes six second refracting surfaces. The arrangement of the plurality of second refracting surfaces can not only further condense light and improve brightness, but also make the viewing angle more uniform.

[0014] In a preferred embodiment, the angle of each inverse prism strip is 88°, and the distance between adjacent two inverse prism strips is 21u.

[0015] The present invention further includes a liquid crystal display backlight module, which includes a frame. Inside the frame, a reflective film, a light guide plate, a diffusion film, an upper and lower prism film, a liquid crystal panel and an abrasion-resistant film are sequentially arranged from bottom to top. The super light condensing composite brightness enhancement film is arranged between the liquid crystal panel and the upper and lower prism film and is used to improve the brightness of the liquid crystal display backlight module and the uniformity of the viewing angle.

[0016] In a preferred embodiment, a light source is further provided inside the frame. The light source includes a mounting plate, and an LED light bar is embedded on one side of the mounting plate close to the light guide plate. The LED light bar provides light source, enabling the backlight module of the liquid crystal display to emit light stably.

[0017] In a preferred embodiment, an installation opening adapted to the mounting plate is provided on one side of the frame. The mounting plate is detachably fixed in the installation opening, and a sealing strip for improving the sealing performance is provided between the mounting plate and the installation opening to prevent dust and impurities from entering the inside of the frame and polluting the internal structure of the frame.

[0018] Technical effects and advantages of the present invention:

[0019] 1. In the present invention, a plurality of light condensing blocks in the shape of trapezoidal quadrangular prisms or hexagonal pyramids are provided on the top of the core layer:

[0020] The light condensing block in the shape of a trapezoidal quadrangular prism is compounded with the core layer and a plurality of inverse prism strips, and can respectively converge the large-angle light entering from the incident surface and the exit surface once and twice, reduce light loss, and improve the central brightness of the backlight.

[0021] The light condensing block in the shape of a hexagonal pyramid is compounded with the core layer and a plurality of inverse prism strips. Since the light condensing block in the shape of a hexagonal pyramid has more light collection directions, it can better converge the large-angle light entering from the incident surface and the exit surface once and twice, reduce light loss, improve the central brightness of the backlight, and also improve the uniformity of the viewing angle.

[0022] 2. By installing a super-light-condensing composite brightness enhancement film with a light condensing block in the shape of a trapezoidal quadrangular prism or a hexagonal pyramid between the liquid crystal panel and the upper and lower prism films, the film can continuously refract and reflect light for light condensation, so as to achieve the effect of light condensation and brightness enhancement. The use of a single film can reduce the assembly cost of the backlight module of the liquid crystal display, can converge the light at a large viewing angle to the central area, improve the backlight brightness, and also improve the uniformity of the viewing angle of the backlight module of the liquid crystal display.

[0023] 3. By directly installing the mounting plate carrying the LED light bar in the installation opening on the side wall of the frame, it is convenient for the staff to quickly replace the LED light bar, the operation is simple, and the maintenance efficiency of the LED light bar can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the super-light-condensing composite brightness enhancement film;

[0025] Figure 2 It is a cross-sectional view of the core layer, the light condensing block in the shape of a trapezoidal quadrangular prism and the lower brightness enhancement structure of the super-light-condensing composite brightness enhancement film;

[0026] Figure 3Top view of the core layer and the lower layer brightness enhancement structure of the super-condensing composite brightness enhancement film;

[0027] Figure 4 Cross-sectional view of the core layer, the hexagonal pyramid-shaped light condensing block and the lower layer brightness enhancement structure of the super-condensing composite brightness enhancement film;

[0028] Figure 5 Cross-sectional view of the backlight module of the liquid crystal display;

[0029] Figure 6 Structural diagram of the trapezoidal quadrangular prism-shaped light condensing block and the frame;

[0030] Figure 7 Structural diagram of the hexagonal pyramid-shaped light condensing block and the frame;

[0031] Figure 8 Schematic diagram of the light source structure.

[0032] Reference numerals are: 1, core layer; 11, multi-layer film; 111, PET base film; 112, titanium oxide film;

[0033] 2, upper layer brightness enhancement structure; 21, light condensing block; 3, lower layer brightness enhancement structure; 4, retro-prism strip; 5, first refraction surface; 6, second refraction surface;

[0034] 7, frame; 71, reflective film; 72, light guide plate; 73, diffusion film; 74, upper and lower prism films; 75, liquid crystal panel; 76, wear-resistant film; 77, light source; 771, mounting plate; 772, LED light bar; 78, mounting opening; 79, sealing strip. Specific embodiments

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1

[0037] Referring to the accompanying drawings of the specification Figures 1 - 3 , the present invention provides a super-condensing composite brightness enhancement film, including a core layer 1 with a core layer thickness of 40μm, 50μm, 60μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm. The core layer 1 is a multi-layer film 11 made of polyethylene terephthalate and its copolymers, and its optical structure can reflect the transmitted S light perpendicular to the transmission axis of the polarizer, and then be reflected back by the reflector for reuse, increasing the number of P lights and improving the light utilization rate.

[0038] The upper brightening structure 2 is fixed on the top of the core layer 1. The upper brightening structure 2 includes a plurality of light - condensing blocks 21, and the plurality of light - condensing blocks 21 are linearly arrayed on the top of the core layer 1. When each light - condensing block 21 is in the shape of a trapezoidal quadrangular prism, the trapezoidal quadrangular - prism - shaped light - condensing block 21 is recessed downward on the top of the core layer 1. The trapezoidal quadrangular - prism - shaped light - condensing block 21 includes five first refracting surfaces 5 for second - stage convergence of the light from the light - emitting surface, reducing light loss again.

[0039] The lower brightening structure 3 is fixed on the bottom of the core layer 1. The lower brightening structure 3 includes a plurality of inverse prism strips 31, and the plurality of inverse prism strips 31 are linearly arrayed on the bottom of the core layer 1. The angle of each inverse prism strip 31 is 88°, and the distance between two adjacent inverse prism strips 31 is 21u.

[0040] The multilayer film 11 made of polyethylene terephthalate and its copolymers is used as the core layer 1. The optical structure of the multilayer film 11 made of polyethylene terephthalate and its copolymers can reflect the transmitted S - light perpendicular to the transmission axis of the polarizer back, and then after being reflected by the reflector, it is reused, increasing the number of P - lights and improving the light utilization rate. At the same time, with a plurality of inverse prism strips 31 as the lower brightening structure 3, the large - angle light entering from the light - incident surface can be converged once, reducing light loss and increasing the backlight center brightness;

[0041] Moreover, trapezoidal quadrangular - prism - shaped light - condensing blocks 21 are arranged on the top of the core layer 1. These light - condensing blocks 21 are recessed downward inside the top of the core layer 1. The bottom of the trapezoidal quadrangular - prism - shaped light - condensing block 21 is a regular - quadrilateral structure, which can collect light in the 0°, 45°, and 90° directions. The plurality of light - condensing blocks 21 and the core layer 1 and the prism structure form a super - light - condensing composite brightening film, which can second - stage converge the large - angle P - light coming out of the light - emitting surface, reducing light loss once again and further increasing the backlight center brightness.

[0042] Embodiment Two

[0043] Different from the embodiment, referring to the attached drawings of the specification Figures 4 - 5 When the bottom edge of each light - condensing block 21 is set to be in the shape of a hexagonal pyramid, the hexagonal - pyramid - shaped light - condensing block 21 protrudes upward on the top surface of the core layer 1. The hexagonal - pyramid - shaped light - condensing block 21 includes six second refracting surfaces 6.

[0044] When the focusing block 21 on the top of the core layer 1 is in the shape of a hexagonal pyramid, the hexagonal pyramid-shaped focusing block 21 protrudes upward and is distributed in a linear array on the top of the core layer 1, and can collect light in the directions of 0°, 30°, 60°, and 90°. Therefore, no matter how the upper and lower light enhancements are turned, the hexagonal pyramid-shaped focusing block 21 has a relatively large light collection ability and can better converge the large-angle P light coming out of the light-emitting surface for a second time, thereby reducing light loss again and thereby increasing the backlight center brightness. At the same time, since the hexagonal pyramid-shaped focusing block 21 has more light collection directions, the viewing angle will also be more uniform.

[0045] Refer to the instruction manual Figures 6 - 8 The present invention also provides a liquid crystal display backlight module, including a frame 7, wherein a reflective film 71, a light guide plate 72, a diffusion film 73, upper and lower prism films 74, a liquid crystal panel 75 and a wear-resistant film 76 are arranged in sequence from bottom to top inside the frame 7, and the super-focusing composite brightness enhancement film of embodiment 1 or embodiment 2 is arranged between the liquid crystal panel 75 and the upper and lower prism films 74.

[0046] The reflective film 71 can reflect the light that would have leaked out through the bottom or surrounding areas of the light guide plate 72 back into the light guide plate 72, so that the light can participate in the propagation and distribution of the display light again, reducing the waste of light and significantly improving the utilization efficiency of the light emitted by the light source by the entire backlight module. The diffusion film 73 uses a special optical structure or material to scatter the light in different directions and change the propagation direction of the light, so that the light is distributed more evenly in the entire display area. The prism structure of the upper and lower prism films 74 can re-converge and guide the more divergent light emitted from the diffusion film 73. It uses the refraction and reflection principles of the prism to make the light propagate in a direction perpendicular to the liquid crystal panel, reducing the scattering of light in the horizontal direction, thereby concentrating the light within a smaller angle range and improving the utilization rate of light. The wear-resistant film 76 can serve as the outermost protective barrier to withstand the friction and scratches that may be caused by the outside world, avoid scratches on the surface of the liquid crystal panel below, and prevent the display effect of the liquid crystal panel from being reduced due to scratches.

[0047] In addition, a light source 77 is provided inside the frame 7. The light source 77 includes a mounting plate 771. A LED light bar 772 is embedded on the side of the mounting plate 771 close to the light guide plate 72. The LED light bar 772 provides a light source to enable the LCD backlight module to emit light stably.

[0048] In actual use, the super-condensing composite brightness enhancement film is installed between the liquid crystal panel 75 and the upper and lower prism films 74. When the light emitted by the LED light bar 772 passes through the light guide plate 72, the reflection film 71, and the upper and lower prism films 74 and enters the super-condensing composite brightness enhancement film, whether it passes through the trapezoidal quadrangular prism-shaped light condensing block 21 or the hexagonal pyramid-shaped light condensing block 21, it will continuously refract and reflect to condense light, so as to achieve the effect of light condensation and brightness enhancement. Compared with the traditional liquid crystal display backlight module, the use of a single super-condensing composite brightness enhancement film can reduce the assembly cost. Moreover, the super-condensing composite brightness enhancement film has multiple light-receiving directions, which can not only converge the light with a large viewing angle to the central area, thereby greatly improving the backlight brightness of the liquid crystal display backlight module, but also make the viewing angle of the liquid crystal display backlight module more uniform.

[0049] Moreover, an installation opening 78 adapted to the mounting plate 771 is provided on one side of the frame 7. The mounting plate 771 is detachably fixed in the installation opening 78. A sealing strip 79 for improving the sealing performance is provided between the mounting plate 771 and the installation opening 78 to prevent dust and impurities from entering the inside of the frame 7 and polluting the structure inside the frame 7. By loosening the multiple bolts between the mounting plate 771 and the frame 7, the mounting plate 771 and the LED light bar 772 can be taken out of the installation opening 78 together, which is convenient for the staff to quickly replace the LED light bar 772. Compared with the traditional liquid crystal display backlight module, the time for sequentially disassembling the reflection film 71, the light guide plate 72, the diffusion film 73, the upper and lower prism films 74, the brightness enhancement film, the liquid crystal panel 75, and the wear-resistant film 76 is saved.

[0050] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A super-condensing composite brightening film, characterized in that, Comprising; A core layer (1), wherein the core layer (1) is a multilayer film (11) made of polyethylene terephthalate and its copolymers; An upper brightening structure (2), wherein the upper brightening structure (2) is fixed on the top of the core layer (1), and the upper brightening structure (2) includes a plurality of light condensing blocks (21), and the plurality of light condensing blocks (21) are linearly arrayed on the top of the core layer (1), and the light condensing blocks (21) are set as trapezoidal quadrangular prisms or hexagonal pyramids; A lower brightening structure (3), wherein the lower brightening structure (3) is fixed on the bottom of the core layer (1), and the lower brightening structure (3) includes a plurality of inverse prism strips (4), and the plurality of inverse prism strips (4) are linearly arrayed on the bottom of the core layer (1).

2. The super-condensing composite brightening film according to claim 1, wherein: The thickness range of the core layer (1) is 30 - 150 μm.

3. The super-condensing composite brightening film according to claim 1, wherein: When each light condensing block (21) is a trapezoidal quadrangular prism, the trapezoidal quadrangular prism-shaped light condensing block (21) is sunken downward on the top of the core layer (1).

4. The super-condensing composite brightening film according to claim 1, wherein: The trapezoidal quadrangular prism-shaped light condensing block (21) includes five first refracting surfaces (5).

5. The super-condensing composite brightening film according to claim 1, wherein: When the bottom edge of each light condensing block (21) is set as a hexagonal pyramid, the hexagonal pyramid-shaped light condensing block (21) protrudes upward on the top surface of the core layer (1), and the hexagonal pyramid-shaped light condensing block (21) includes six second refracting surfaces (6).

6. The super-condensing composite brightness enhancement film according to claim 1, wherein: The angle of each inverse prism strip (4) is 88°, and the distance between adjacent two inverse prism strips (4) is 21u.

7. A liquid crystal display backlight module installed with the super-condensing composite brightness enhancement film according to any one of claims 1-6, characterized in that: Comprising a frame (7), wherein a reflective film (71), a light guide plate (72), a diffusion film (73), an upper and lower prism film (74), a liquid crystal panel (75) and an abrasion-resistant film (76) are sequentially arranged from bottom to top inside the frame (7), and the super light condensing composite brightening film is arranged between the liquid crystal panel (75) and the upper and lower prism film (74).

8. The backlight module of a liquid crystal display according to claim 7, wherein: A light source (77) is further arranged inside the frame (7), and the light source (77) includes a mounting plate (771), and an LED light strip (772) is inlaid on one side of the mounting plate (771) close to the light guide plate (72).

9. The backlight module of a liquid crystal display according to claim 8, characterized in that: An installation opening (78) adapted to the mounting plate (771) is formed on one side of the frame (7), the mounting plate (771) is detachably fixed in the installation opening (78), and a sealing strip (79) for improving the sealing performance is arranged between the mounting plate (771) and the installation opening (78).

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