A narrow frame backlight module with a bright line light leakage prevention side reflection structure

Abstract

The invention discloses a narrow frame backlight module with a side reflection structure to prevent light leakage from bright lines, comprising a light guide plate, a lower reflection film layer attached to the bottom surface of the light guide plate, and a side reflection structure attached to the side of the light guide plate, wherein the side reflection structure is sequentially composed of an adhesive layer, a gray material layer, a first anti-silver oxidation protective layer, a first vacuum silver-plated layer, a first PET layer, a second vacuum silver-plated layer, a second anti-silver oxidation protective layer, a second PET layer, and a black ink layer from the inside to the outside. The invention can prevent light loss from the side of the light guide plate, effectively prevent light leakage, reduce the risk of light leakage of the whole machine, and prevent light leakage from bright lines in a narrow frame, thereby improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of backlight modules, and in particular to a narrow-frame backlight module with a bright-line light leakage prevention side edge reflection structure. Background Art

[0002] At present, LCD screens such as monitors, televisions, and smart screens have been widely used. LCD screens include LCD panels and backlight modules. The backlight module provides light for the LCD panel. At present, traditional LCD displays are mainly based on side-entry LED backlight module structures. The sides of the light guide plate adopt ordinary white reflection structures or silver reflection structures, which are prone to light leakage and large brightness loss. The main reason is that the reflectivity of the side reflection material is not high enough, and the reflection layer will be light-transmissive. The reflective material will transmit light and cause light loss, which will reduce the display brightness of the whole machine and there is a risk of light leakage. On the other hand, the display frame of traditional LCD displays is becoming narrower and narrower, and the distance of the frame covering the edge of the light guide plate is getting narrower and narrower. In this case, the existing side reflection structure of the backlight module cannot fully meet the requirements. The narrower the frame distance, the easier it is for the light reflected by the side reflection structure of the backlight module to be emitted from the inside of the frame, that is, the greater the risk of bright line leakage.

[0003] Chinese patent 201620529699.5 discloses a backlight module for improving bright edges, which includes a light shielding glue arranged on the back of the screen, an upper light-enhancing sheet arranged at the bottom of the light shielding glue, a lower diffuser arranged at the bottom of the upper light-enhancing sheet, the bottom of the lower diffuser connected to a light guide plate, an LED light source is arranged on one side of the light guide plate, a glue frame is connected to the bottom of the light guide plate, an adhesive layer is arranged at the bottom of the glue frame, a reflective sheet is arranged at the bottom of the adhesive layer, and an opaque black single-sided tape is arranged between the light guide plate and the light shielding glue, and the black single-sided tape is arranged on the other three sides of the light guide plate opposite to the side of the LED light source. The black single-sided tape can improve the bright edge, but it does not play a role in improving the reflectivity, and the black single-sided tape is attached between the light guide plate and the light shielding glue on the upper side of the light guide plate, rather than being arranged on the side of the light guide plate, and does not play a role in preventing light leakage on the side of the light guide plate; and this backlight module is not suitable for a narrow frame structure, and the reflected light is easily emitted from the side of the narrow frame to form a bright line. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a narrow-frame backlight module with a side reflection structure to prevent bright line light leakage based on the deficiencies of the above-mentioned technology. The backlight module can prevent light loss from the side of the light guide plate, effectively prevent light leakage, reduce the light leakage risk of the whole machine, and prevent light leakage from the bright lines of the narrow frame, thereby improving the user experience.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a narrow-frame backlight module with a side reflection structure to prevent bright line light leakage, comprising a light guide plate, a lower reflection film layer is attached to the bottom surface of the light guide plate, and a side reflection structure is attached to the side of the light guide plate, wherein the side reflection structure is composed of an adhesive layer, a gray material layer, a first anti-silver oxidation protective layer, a first vacuum silver-plated layer, a first PET layer, a second vacuum silver-plated layer, a second anti-silver oxidation protective layer, a second PET layer and a black ink layer from the inside to the outside.

[0006] Preferably, the gray material layer is plated on the inner side of the first anti-silver oxidation protection layer to scatter and refract light.

[0007] Preferably, the thickness of the adhesive layer is 48μm to 52μm, the thickness of the gray material layer is 4μm to 6μm, the thickness of the first anti-silver oxidation protective layer is 0.8μm to 1.2μm, the thickness of the first vacuum silver-plated layer is 70nm to 80nm, the thickness of the first PET layer is 24μm to 26μm, the thickness of the second vacuum silver-plated layer is 70nm to 80nm, the thickness of the second anti-silver oxidation protective layer is 0.8μm to 1.2μm, the thickness of the second PET layer is 48μm to 52μm, and the thickness of the black ink layer is 4.5μm to 5.5μm.

[0008] Preferably, the side reflective structure comprises a left side reflective structure, an upper side reflective structure and a right side reflective structure, which are correspondingly attached to the left side, the upper side and the right side of the light guide plate. An LED light source is arranged on the lower side of the light guide plate.

[0009] Preferably, a diffusion film layer is attached to the light guide plate, a first brightness enhancement film layer is attached to the diffusion film layer, a second brightness enhancement film layer is attached to the first brightness enhancement film layer, a DBEF reflective polarized brightness enhancement film is attached to the second brightness enhancement film layer, and a liquid crystal glass is attached to the DBEF reflective polarized brightness enhancement film.

[0010] Preferably, the narrow-frame backlight module with the anti-bright line light leakage side reflection structure also includes a back panel and a U-shaped frame, the side of the back panel has a frame portion bent upward, the lower reflection film layer, the light guide plate, the side reflection structure, the diffusion film layer, the first light enhancement film layer, the second light enhancement film layer and the DBEF reflective polarized brightening film are all installed in the frame portion above the back panel; the middle part of the U-shaped frame is provided with a spacer, which separates the U-shaped frame into a lower U-shaped frame portion and an upper U-shaped frame portion, the lower U-shaped frame portion is mounted outside the frame portion of the back panel, and the liquid crystal glass is installed in the upper U-shaped frame portion.

[0011] Preferably, the narrow-frame backlight module with anti-bright line light leakage side reflection structure also includes a rear shell, a lower frame bar and a driving board, the rear shell is installed at the lower end of the rear side of the back plate, the driving board is installed inside the rear shell, and the lower frame bar is installed at the lower end of the back plate; the liquid crystal glass is connected to a T-CON board for driving the liquid crystal glass, and the T-CON board is installed in the rear shell on the rear side of the back plate.

[0012] The beneficial effects of the present invention are as follows: the present invention is provided with a side reflective structure on the side of the light guide plate, and the side reflective structure is composed of an adhesive layer, a gray material layer, a first anti-silver oxidation protective layer, a first vacuum silver-plated layer, a first PET layer, a second vacuum silver-plated layer, a second anti-silver oxidation protective layer, a second PET layer and a black ink layer from the inside to the outside; because the gray material layer is electroplated on the inside of the first anti-silver oxidation protective layer, it can scatter and refract the light, making the light soft, so that the refraction angle of the light reflected back by the side reflective structure will be reduced, so that when observing the inside of the frame at the same position, the bright line of light will become weaker, and there will be no bright line light leakage. Through this principle, the width distance of the frame can be effectively reduced to achieve a narrower frame distance; the present invention Two layers of vacuum silver-plated layers are clearly provided, which can make the side reflectivity of the backlight module very high, prevent light loss through transmission, and improve brightness; a first anti-silver oxidation protective layer is provided on the first vacuum silver-plated layer, and a second anti-silver oxidation protective layer is provided on the outer layer of the second vacuum silver-plated layer, which can prevent the vacuum silver-plated layer from oxidizing and play a role in protecting the vacuum silver-plated layer; a first PET layer is provided between the first vacuum silver-plated layer and the second vacuum silver-plated layer, and a second PET layer is provided outside the second anti-silver oxidation protective layer, which has good light transmittance, good stiffness, and strong impact resistance; a black ink layer is covered outside the second PET layer, preferably a matte black black ink layer, which can further prevent light loss through transmission, improve brightness, effectively prevent light leakage, reduce the light leakage risk of the entire machine, and improve user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a dispersion diagram of the overall structure of the present invention.

[0014] Figure 2 for Figure 1 A magnified view of the structure of part A.

[0015] Figure 3 This is a dispersion diagram of the light guide plate, lower reflective film layer, side reflective structure and LED light source.

[0016] Figure 4 for Figure 3 A magnified view of the structure of part B.

[0017] Figure 5 It is a structural hierarchy diagram of the side reflective structure of the present invention.

[0018] Figure 6Schematic diagram of the reflection principle of the side reflection structure.

[0019] In the figure: 1. light guide plate; 2. lower reflective film layer; 3. side reflective structure; 31. adhesive layer; 32. gray material layer; 33. first anti-silver oxidation protective layer; 34. first vacuum silver-plated layer; 35. first PET layer; 36. second vacuum silver-plated layer; 37. second anti-silver oxidation protective layer; 38. second PET layer; 39. black ink layer; 4. LED light source; 41. LED light; 5. diffusion film layer; 6. first light-enhancing film layer; 7. second light-enhancing film layer; 8. DBEF reflective polarized light-enhancing film; 9. liquid crystal glass; 91. T-CON board; 10. back panel; 101. frame part; 11. U-shaped frame; 111. spacer; 112. lower U-shaped frame part; 113. upper U-shaped frame part; 12. rear shell; 13. lower frame strip; 14. driver board. DETAILED DESCRIPTION

[0020] The structural principle and working principle of the present invention are further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 to Figure 5As shown, the present invention is a narrow frame backlight module with a side reflection structure to prevent bright line light leakage, comprising a light guide plate 1, a lower reflection film layer 2 is attached to the bottom surface of the light guide plate 1, and a side reflection structure 3 is attached to the side of the light guide plate 1. The side reflection structure is composed of an adhesive layer 31, a gray material layer 32, a first anti-silver oxidation protection layer 33, a first vacuum silver-plated layer 34, a first PET layer 35, a second vacuum silver-plated layer 36, a second anti-silver oxidation protection layer 37, a second PET layer 38 and a black ink layer 39 from the inside to the outside. The gray material layer 32 is plated on the inside of the first anti-silver oxidation protection layer 33 to scatter and refract light; in actual tests, 3%-4% of the light is lost after passing through the gray material layer 32, that is, the side reflection structure 3 with the gray material layer can still ensure a light reflectivity of 96%-97%. Because the gray material layer is electroplated on the inner side of the first anti-silver oxidation protective layer, it can scatter and refract the light and make the light softer. The refraction angle of the light reflected back by the side reflection structure will be reduced. In this way, when observing the inside of the frame at the same position, the bright line of light will become weaker, and there will be no bright line light leakage. Through this principle, the width distance of the frame can be effectively reduced to achieve a narrower frame distance. Providing two layers of vacuum silver-plated layers can make the side reflectivity of the backlight module very high, prevent light loss and improve brightness; a first anti-silver oxidation protective layer is provided on the first vacuum silver-plated layer, and a second anti-silver oxidation protective layer is provided on the outer layer of the second vacuum silver-plated layer, which can prevent the vacuum silver-plated layer from oxidizing and play a role in protecting the vacuum silver-plated layer; a first PET layer is provided between the first vacuum silver-plated layer and the second vacuum silver-plated layer, and a second PET layer is provided outside the second anti-silver oxidation protective layer, which has good light transmittance, good stiffness and strong impact resistance; a black ink layer is covered outside the second PET layer, preferably a matte black black ink layer, which can further prevent light loss and improve brightness, can effectively prevent light leakage, reduce the risk of light leakage of the whole machine, and improve user experience.

[0022] like Figure 5As shown, the thickness of the adhesive layer 31 is 48μm-52μm, preferably 50μm, the thickness of the gray material layer 32 is 4μm-6μm, preferably 5μm, the thickness of the first anti-silver oxidation protection layer 33 is 0.8μm-1.2μm, preferably 1.0μm, the thickness of the first vacuum silver-plated layer 34 is 70nm-80nm, preferably 74nm-76nm, the thickness of the first PET layer 35 is 24μm-26μm, preferably 25μm, the thickness of the second vacuum silver-plated layer 36 is 70nm-80nm, preferably 74nm-76nm, the thickness of the second anti-silver oxidation protection layer 37 is 0.8μm-1.2μm, preferably 1.0μm, the thickness of the second PET layer 38 is 48μm-52μm, preferably 50μm, and the thickness of the black ink layer 39 is 4.5μm-5.5μm, preferably 5.0μm. The film layers of the side reflective structure 3 have the above-mentioned thicknesses, which can optimally achieve the prevention of bright line light leakage, the prevention of side light leakage and high reflection.

[0023] like Figure 1 , Figure 3 and Figure 4 As shown, the side reflective structure 3 includes a left side reflective structure, an upper side reflective structure and a right side reflective structure, which are correspondingly attached to the left side, upper side and right side of the light guide plate. The lower side of the light guide plate 1 is provided with an LED light source 4, which includes a row of LED lights 41, and the LED lights are welded on the light bar.

[0024] like Figure 1 As shown, a diffusion film layer 5 is attached to the light guide plate 1, a first light enhancement film layer 6 is attached to the diffusion film layer 5, a second light enhancement film layer 7 is attached to the first light enhancement film layer 6, a DBEF reflective polarized brightness enhancement film 8 is attached to the second light enhancement film layer 7, and a liquid crystal glass 9 is attached to the DBEF reflective polarized brightness enhancement film 8.

[0025] like Figure 1 and Figure 2As shown, the narrow-frame backlight module with anti-bright line light leakage side reflection structure also includes a back panel 10 and a U-shaped frame 11, the side of the back panel 10 has an upwardly bent frame portion 101, the lower reflection film layer 2, the light guide plate 1, the side reflection structure 3, the diffusion film layer 5, the first light enhancement film layer 6, the second light enhancement film layer 7 and the DBEF reflective polarized brightness enhancement film 8 are all installed in the frame portion 101 on the back panel 10; the middle part of the U-shaped frame 11 has a spacer 111, the spacer 111 separates the U-shaped frame 11 into a lower U-shaped frame portion 112 and an upper U-shaped frame portion 113, the lower U-shaped frame portion 112 is mounted outside the frame portion 101 of the back panel 10, and the liquid crystal glass 9 is installed in the upper U-shaped frame portion 113. The narrow-frame backlight module with the anti-bright-line light leakage side reflection structure also includes a rear shell 12, a lower frame bar 13 and a driving board 14, wherein the rear shell 12 is installed at the lower end of the rear side of the back plate 10, the driving board 14 is installed inside the rear shell, and the lower frame bar 13 is installed at the lower end of the back plate 13; the liquid crystal glass 9 is connected to a T-CON board 91 for driving the liquid crystal glass 9, and the T-CON board 91 is installed in the rear shell 12 on the rear side of the back plate 10; the T-CON board is also called a logic board or a control board, and T-CON is the abbreviation of Timing Controller, which means a timing control circuit.

[0026] like Figure 6 As shown, the LED light source 4 emits light from the side, and the light refraction and reflection are generated through the mesh points 1001 of the light guide plate. When the light is reflected and refracted to the gray material layer, the gray material layer scatters and refracts the light, making the light soft. In this way, the refraction angle of the light reflected back by the side reflection structure will be reduced. In this way, when observing the inner side of the frame at the same observation position 100, at the same distance L from the visible area to the frame, the bright line of light will become weaker, and there will be no bright line light leakage. Through this principle, the width distance of the frame can be effectively reduced to achieve a narrower frame distance. On the other hand, when the light is reflected to the first vacuum silver-plated layer and the second vacuum silver-plated layer of the side reflection structure, the reflection and refraction of the light will return to the light guide plate 1, so that the utilization efficiency of the light is improved, and the brightness of the backlight module is improved. At the same time, because the side reflection structure has a black ink layer, the light will not pass through the PET layer and the black ink layer, avoiding light loss and light leakage.

[0027] The above description is only a preferred embodiment of the present invention. Any slight modification, equivalent changes and modifications made to the above embodiments according to the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A narrow-frame backlight module with a bright line light leakage prevention side reflection structure, characterized in that: The light guide plate (1) comprises a lower reflective film layer (2) attached to the bottom surface of the light guide plate (1), and a side reflective structure (3) attached to the side edge of the light guide plate (1), wherein the side reflective structure comprises, from the inside to the outside, an adhesive layer (31), a gray material layer (32), a first anti-silver oxidation protective layer (33), a first vacuum silver-plated layer (34), a first PET layer (35), a second vacuum silver-plated layer (36), a second anti-silver oxidation protective layer (37), a second PET layer (38) and a black ink layer (39); the thickness of the adhesive layer (31) is 48 μm to 52 μm, the thickness of the gray material layer (32) is The thickness of the first anti-silver oxidation protective layer (33) is 4 μm to 6 μm, the thickness of the first vacuum silver-plated layer (34) is 0.8 μm to 1.2 μm, the thickness of the first vacuum silver-plated layer (34) is 70 nm to 80 nm, the thickness of the first PET layer (35) is 24 μm to 26 μm, the thickness of the second vacuum silver-plated layer (36) is 70 nm to 80 nm, the thickness of the second anti-silver oxidation protective layer (37) is 0.8 μm to 1.2 μm, the thickness of the second PET layer (38) is 48 μm to 52 μm, and the thickness of the black ink layer (39) is 4.5 μm to 5.5 μm; A diffusion film layer (5) is attached to the light guide plate (1), a first brightness enhancement film layer (6) is attached to the diffusion film layer (5), a second brightness enhancement film layer (7) is attached to the first brightness enhancement film layer (6), a DBEF reflective polarized brightness enhancement film (8) is attached to the second brightness enhancement film layer (7), and a liquid crystal glass (9) is attached to the DBEF reflective polarized brightness enhancement film (8); the narrow-frame backlight module also includes a back plate (10) and a U-shaped frame (11), the side edge of the back plate having a frame portion (101) bent upward, the lower reflective film layer (2), the light guide plate (1), and the side reflective frame portion (101) being attached to the back plate (10), and the lower reflective film layer (2), the light guide plate (1), and the side reflective frame portion (101) being attached to the back plate (10). The structure (3), the diffusion film layer (5), the first brightness enhancement film layer (6), the second brightness enhancement film layer (7) and the DBEF reflective polarized brightness enhancement film (8) are all installed inside the frame portion (101) on the back plate (10); the middle part of the U-shaped frame (11) has a spacer (111), and the spacer (111) separates the U-shaped frame (11) into a lower U-shaped frame portion (112) and an upper U-shaped frame portion (113); the lower U-shaped frame portion (112) is sleeved outside the frame portion (101) of the back plate (10), and the liquid crystal glass (9) is installed inside the upper U-shaped frame portion (113).

2. The narrow-frame backlight module with a bright line light leakage prevention side reflection structure according to claim 1, characterized in that: The grey material layer (32) is plated on the inner side of the first anti-silver oxidation protective layer (33) and is used for scattering and refracting light.

3. The narrow-frame backlight module with a bright line light leakage prevention side reflection structure according to claim 1, characterized in that: The thickness of the adhesive layer (31) is 50 μm, the thickness of the gray material layer (32) is 5 μm, the thickness of the first anti-silver oxidation protective layer (33) is 1.0 μm, the thickness of the first vacuum-plated silver layer (34) is 74 nm to 76 nm, the thickness of the first PET layer (35) is 25 μm, the thickness of the second vacuum-plated silver layer (36) is 74 nm to 76 nm, the thickness of the second anti-silver oxidation protective layer (37) is 1.0 μm, the thickness of the second PET layer (38) is 50 μm, and the thickness of the black ink layer (39) is 5.0 μm.

4. The narrow-frame backlight module with a bright line light leakage prevention side reflection structure according to claim 1, characterized in that: The side reflection structure (3) comprises a left side reflection structure, an upper side reflection structure and a right side reflection structure, and is correspondingly attached to the left side, the upper side and the right side of the light guide plate (1).

5. The narrow-frame backlight module with a bright line light leakage prevention side reflection structure according to claim 4, characterized in that: An LED light source (4) is provided on the lower side of the light guide plate (1).

6. The narrow-frame backlight module with a bright line light leakage prevention side reflection structure according to claim 1, characterized in that: The device also comprises a rear shell (12), a lower frame bar (13) and a driving board (14), wherein the rear shell (12) is mounted on the lower end of the rear side of the back plate (10), the driving board (14) is mounted inside the rear shell (12), and the lower frame bar (13) is mounted on the lower end of the back plate (10); the liquid crystal glass (9) is connected to a T-CON board (91) for driving the liquid crystal glass (9), and the T-CON board (91) is mounted in the rear shell (12) on the rear side of the back plate (10).

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