Backlight display module for improving mura problem of module at end corner position

Abstract

The utility model discloses a backlight display module for improving the mura problem of the module at the end corner position, which comprises an iron frame, a light guide plate, a display assembly, an optical film material assembly and an LED lamp, the light guide plate, the display assembly and the LED lamp are all installed inside the iron frame, and the optical film material assembly is installed between the light guide plate and the display assembly. According to the backlight display module for improving the mura problem of the module at the end corner positions, the light guide plate is divided into two areas with different light-emitting requirements, namely the middle light-emitting area and the four end corner light-emitting areas, and the whole-surface uniform light-emitting design is still carried out according to the number of the LED lamps and the lamp distance in the middle position; and from the newly divided four end corner light-emitting areas, the brightness of the four end corner areas of the light guide plate can be transited from bright to dark by gradually reducing the light guide lattice points on the light guide plate from inside to outside, so that the problem that the module assembly turns white at the lower end corner position of a black UI picture is solved, and the sensory effect of a client is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of display modules, and in particular to a backlight display module for improving the mura problem of the module at an end corner. Background Art

[0002] Conventional backlight luminous area design combines the number of LED lights and the distance between lights, and achieves uniform brightness of the entire luminous surface through the density design of the light guide plate dots. However, when the LCD screen itself has uneven thickness at the corners, the contraction of the polarizer will cause tensile stress on the LCD screen. After such stress is generated, the thickness of the LCD screen will change, especially at the four corners of the LCD screen. The transmittance of the LCD screen at these positions is much higher than that at other positions. When the LCD screen displays a black screen, because the transmittance of the LCD screen at the corners is higher, the light of the backlight module will be more transmitted through these four corners. Figure 7 As shown, the four corners are white, which is called corner mura in the industry. This type of mura presents a gradual effect from the outside to the inside. The closer to the corner, the more serious the whitening. The effect displayed is that the four corners change from black to white, affecting the customer's sensory effect. Utility Model Content

[0003] Based on this, it is necessary to provide a backlight display module that improves the mura problem of the module at the end corners in response to the above-mentioned technical problems. The light guide plate is divided into two areas with different lighting requirements, the central light-emitting area and the four end corner light-emitting areas. The middle position is still designed for uniform lighting of the entire surface in consideration of the number of LED lights and the distance between lights. For the four newly divided end corner light-emitting areas, the four end corner areas of the light guide plate can achieve a transition from bright to dark brightness by gradually reducing the light guide dots on the light guide plate from the inside to the outside, thereby eliminating the problem of whitening at the end corners of the module assembly under the black UI screen.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A backlight display module for improving the mura problem at the end corner of the module, comprising:

[0006] An iron frame, a light guide plate, a display assembly, an optical film assembly and an LED lamp, wherein the light guide plate, the display assembly and the LED lamp are all installed inside the iron frame, and the optical film assembly is installed between the light guide plate and the display assembly;

[0007] A central light-emitting area and four corner light-emitting areas are arranged on the side of the light guide plate away from the optical film material assembly. Light-guiding points are arranged on the central light-emitting area and the corner light-emitting areas. The light-guiding points at the corner light-emitting areas gradually decrease from the inside to the outside.

[0008] Furthermore, the number of light-guiding points in the middle light-emitting area is greater than the maximum number of light-guiding points in the end corner light-emitting areas.

[0009] Furthermore, the end angle light emitting area includes a right angle and an arc, the right angle and the arc are connected by two straight sides, the length of each side of the right angle is 1 / 20-1 / 25 of the circumference of the light guide plate, and the length of the straight side is 1 / 2 of the length of the right angle side.

[0010] Furthermore, the display assembly includes a cover plate and a liquid crystal display screen, the cover plate is bonded to the liquid crystal display screen by a full-bonding adhesive, and the cover plate is fixedly connected to the iron frame.

[0011] Furthermore, the optical film assembly includes a first brightness enhancement film, a second brightness enhancement film and a diffusion film which are connected in sequence, and the diffusion film is attached to the light guide plate.

[0012] Furthermore, a reflective film is installed between the iron frame and the light guide plate.

[0013] Furthermore, the light guiding grid points are arranged on a side close to the reflective film, and the light guiding grid points are spherical or ellipsoidal protrusions.

[0014] Furthermore, the thickness of the light guide plate is 0.5-1.0 mm, and the particle size of the light guide dots is 0.2-0.3 mm.

[0015] Furthermore, a boss is fixedly connected inside the iron frame, the reflective film is located inside the boss, the light guide plate is installed on the boss, and a gap is left between the light guide grid points and the reflective film.

[0016] Furthermore, a sealing gasket is installed between the boss and the light guide plate.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model provides a backlight display module for improving the mura problem of the module at the end corners, by dividing the light guide plate into two areas with different lighting requirements, a middle light-emitting area and four end corner light-emitting areas, while the middle position is still designed for uniform lighting of the entire surface in consideration of the number of LED lamps and the lamp distance, and for the four newly divided end corner light-emitting areas, the four end corner areas of the light guide plate can achieve a transition from bright to dark brightness by gradually reducing the light guide dots on the light guide plate from the inside to the outside, thereby eliminating the problem of whitening at the end corners of the module assembly under a black UI screen and improving the sensory effect of the client.

[0019] The utility model provides a backlight display module for improving the mura problem at the end corner position of the module. By arranging a boss and a sealing gasket, the sealing between the light guide plate and the iron frame can be improved, thereby preventing external dust from entering between the light guide plate and the reflective film, preventing the light guide points from being scratched by particulate foreign matter, and reducing the production of defective backlight modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the front cross-sectional structure of a backlight display module provided by the utility model for improving the mura problem of the module at the end corner position;

[0021] Figure 2 A schematic diagram of the structure of the light guide plate dividing the light-emitting area of ​​the backlight display module provided by the utility model to improve the mura problem of the module at the end corner position;

[0022] Figure 3 A schematic diagram of the light guide grid distribution structure of the light emitting area of ​​the backlight display module for improving the mura problem of the module at the end corner position provided by the utility model;

[0023] Figure 4 A schematic diagram of the structure of adding a boss inside the iron frame of a backlight display module for improving the mura problem at the end corner of the module provided by the utility model;

[0024] Figure 5 The utility model provides a backlight display module for improving the mura problem of the module at the end corner position. Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 6 A schematic diagram of the design principle structure of a backlight display module for improving the mura problem at the end corners of the module provided by the utility model;

[0026] Figure 7 The present invention is a schematic diagram of the structure of the existing backlight display module with white corners.

[0027] The markings in the figure are as follows:

[0028] 1. Iron frame; 2. Light guide plate; 3. Display component; 4. Optical film component; 5. LED lamp; 6. Central light-emitting area; 7. End corner light-emitting area; 8. Light guide network point; 9. Boss; 10. Sealing gasket; 301. Cover plate; 302. LCD screen; 303. Laminating glue; 401. First brightness enhancement film; 402. Second brightness enhancement film; 403. Diffusion film; 404. Reflective film; 701. Right angle; 702. Arc; 703. Straight edge. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0030] As described in the background technology, when the existing LCD screen itself has the problem of uneven thickness of the corner boxes, tensile stress will be generated. After such stress is generated, it will manifest as whitening at the four corners. The closer to the corners, the more serious the whitening, which affects the customer's sensory effect.

[0031] In order to solve this technical problem, the utility model provides a backlight display module for improving the mura problem at the end corners of the module, which is used to improve the whitening problem at the four end corners of the liquid crystal display screen.

[0032] Specifically, please refer to Figure 1-6 , the backlight display module that improves the mura problem at the end corner position of the module specifically includes:

[0033] Iron frame 1, light guide plate 2, display assembly 3, optical film assembly 4 and LED lamp 5, the light guide plate 2, display assembly 3 and LED lamp 5 are all installed inside the iron frame 1, and the optical film assembly 4 is installed between the light guide plate 2 and the display assembly 3;

[0034] A central light-emitting area 6 and four corner light-emitting areas 7 are arranged on the side of the light guide plate 2 away from the optical film material assembly 4. Light-guiding points 8 are arranged on the central light-emitting area 6 and the corner light-emitting areas 7. The light-guiding points 8 at the corner light-emitting areas 7 are gradually reduced from the inside to the outside.

[0035] The utility model provides a backlight display module for improving the mura problem of the module at the end corner position, by dividing the light guide plate 2 into two areas with different lighting requirements, namely a middle light-emitting area 6 and four end corner light-emitting areas 7. The middle position is still designed for uniform lighting of the entire surface in consideration of the number and lamp distance of the LED lamps 5. As for the four newly divided end corner light-emitting areas 7, the four end corner areas of the light guide plate 2 can achieve a transition from bright to dark brightness by gradually reducing the light guide dots 8 on the light guide plate 2 from the inside to the outside, thereby eliminating the problem of whitening at the end corner position of the module assembly under the black UI screen and improving the sensory effect of the client.

[0036] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] Please refer to Figure 1-3 A backlight display module for improving the mura problem of the module at the end corner position, comprising an iron frame 1, a light guide plate 2, a display component 3, an optical film component 4 and an LED lamp 5, wherein the light guide plate 2, the display component 3 and the LED lamp 5 are all installed inside the iron frame 1, and the optical film component 4 is installed between the light guide plate 2 and the display component 3;

[0040] A central light-emitting area 6 and four corner light-emitting areas 7 are arranged on the side of the light guide plate 2 away from the optical film material assembly 4. Light-guiding points 8 are arranged on the central light-emitting area 6 and the corner light-emitting areas 7. The light-guiding points 8 at the corner light-emitting areas 7 are gradually reduced from the inside to the outside.

[0041] Please refer to Figure 1-6 By dividing the light guide plate 2 into two areas with different lighting requirements, the middle position is still designed for uniform lighting of the entire surface in consideration of the number and lamp distance of the LED lamps 5, and the four corner lighting areas 7 are newly divided, the four corner areas of the light guide plate 2 can achieve a transition from bright to dark brightness by gradually reducing the light guide dots 8 on the light guide plate 2 from the inside to the outside, thereby eliminating the problem of whitening at the corners of the module assembly under the black UI screen and improving the sensory effect of the client.

[0042] The backlight display module for improving the mura problem at the end corner position provided in Example 1 is further optimized. Specifically, Figure 2 and Figure 3 As shown, the number of light-guiding points 8 in the middle light-emitting area 6 is greater than the maximum number of light-guiding points 8 in the end corner light-emitting area 7; the end corner light-emitting area 7 includes a right angle 701 and an arc 702, and the right angle 701 and the arc 702 are connected by two straight edges 703, and the length of each side of the right angle 701 is 1 / 20-1 / 25 of the circumference of the light guide plate 2, and the length of the straight edge 703 is 1 / 2 of the length of the right angle 701.

[0043] The light guide plate 2 is set in this way. On the basis of the customer's black UI screen, the position 11 at which the actual display pattern is closest to the four corners is expanded 5mm outward as the dividing line, namely the arc 702. The corner luminous area 7 is formed by two straight edges 703 and the corners. The shape and size of the corner luminous area 7 can be adjusted according to the display effect, so as to avoid the problem of whitening at the corner position as much as possible.

[0044] The backlight display module for improving the mura problem at the end corner position provided in Example 1 or 2 is further optimized, such as Figure 1 As shown, the display component 3 includes a cover plate 301 and a liquid crystal display screen 302, the cover plate 301 is bonded to the liquid crystal display screen 302 by a full-bonding adhesive 303, and the cover plate 301 is fixedly connected to the iron frame 1; the optical film material component 4 includes a first light-enhancing film 401, a second light-enhancing film 402 and a diffusion film 403 connected in sequence, and the diffusion film 403 is bonded to the light guide plate 2; a reflective film 404 is installed between the iron frame 1 and the light guide plate 2.

[0045] The reflective film 404 is arranged in this way to reflect the light emitted by the LED lamp 5 , and the combination of the first brightness enhancement film 401 , the second brightness enhancement film 402 and the diffusion film 403 can make the light guide plate 2 more uniform.

[0046] The backlight display module for improving the mura problem at the end corner of the module provided in the above embodiments is further optimized, such as Figure 1 , Figure 4 and Figure 5 As shown, the light guide dots 8 are provided on a side close to the reflective film 404, and the light guide dots 8 are spherical or ellipsoidal protrusions; the thickness of the light guide plate 2 is 0.5-1.0 mm, and the particle size of the light guide dots 8 is 0.2-0.3 mm;

[0047] The light guide plate 2 with such a structural design can guide the light very well. After the light emitted by the LED lamp 5 passes through the light guide mesh 8 and the reflective film 404, it is refracted into upward light and passes through the light emitting area.

[0048] The backlight display module for improving the mura problem at the end corner of the module provided in the above embodiments is further optimized, such as Figure 4 and Figure 5 As shown, a boss 9 is fixedly connected to the inside of the iron frame 1, a reflective film 404 is located inside the boss 9, the light guide plate 2 is installed on the boss 9, and a gap is left between the light guide grid 8 and the reflective film 404; a sealing gasket 10 is installed between the boss 9 and the light guide plate 2.

[0049] Such a structural design can improve the sealing between the light guide plate 2 and the iron frame 1, prevent external dust from entering between the light guide plate 2 and the reflective film 404, prevent the light guide points 8 from being scratched by particulate foreign matter, and reduce the generation of defective backlight modules.

[0050] The backlight display module provided by the utility model improves the mura problem of the module at the end corner position. Since the uniformity of each layer of the optical film material component 4 in the backlight module is very high and cannot be adjusted for uniformity, the uniformity design of the backlight luminous area is achieved by combining the arrangement and distance of the LED lights 5 and modifying the design of the light guide points 8 of the light guide plate 2. The design principle is as follows: Figure 6As shown, the display module is placed horizontally, and the light emitted from the LED lamp 5 is horizontal. Only after the light is irradiated on the light guide mesh 8 of the light guide plate 2 and the reflective film 404, can it be refracted into upward light and penetrate from the light emitting area. When the light guide mesh 8 of the light guide plate 2 is denser, the light emitted by the LED lamp 5 will be refracted more, and when the light guide mesh 8 of the light guide plate 2 is sparser, the light emitted by the LED lamp 5 will be refracted less. Combined with the number of lamps and the lamp distance, the light guide plate 2 can be adjusted to a state with higher front uniformity.

[0051] When designing the light guide plate 2, Figure 2 and Figure 3 As shown, the light guide plate 2 is divided into two areas with different lighting requirements, the middle light-emitting area 6 and the four corner light-emitting areas 7, based on the customer's black UI screen, by taking the position 11 where the actual display pattern is closest to the four corners and then expanding the position 5mm outward as a dividing line. The middle position is still designed to be uniformly lit on the entire surface in consideration of the number and distance of the LED lights 5, and the four corner light-emitting areas 7 newly divided are used to adjust the lighting effect of the light guide plate 2 from the same brightness in the middle position to gradually dark from the inside to the outside, so that when it is used with the LCD screen 302 with uneven thickness of the corner boxes, the corner mura problem can be improved, thereby improving the sensory effect of the client;

[0052] When using Figure 3 As shown, the four corner areas of the light guide plate 2 of the utility model can achieve a transition from bright to dark brightness by gradually reducing the light guide dots 8 on the light guide plate 2 from the inside to the outside, thereby eliminating the problem of the module assembly turning white at the corners under the black UI screen. At the same time, this type of backlight will not affect the overall display effect when it is matched with the LCD display 302 with no uneven thickness of the corner box, because the black UI screen itself is black at the corner position, and the light guide plate 2 is darker and the effect is also black, so there is no actual impact.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A backlight display module for improving the mura problem at the end corner of the module, characterized in that: It includes: An iron frame (1), a light guide plate (2), a display assembly (3), an optical film assembly (4) and an LED lamp (5), wherein the light guide plate (2), the display assembly (3) and the LED lamp (5) are all installed inside the iron frame (1), and the optical film assembly (4) is installed between the light guide plate (2) and the display assembly (3); A central light-emitting area (6) and four corner light-emitting areas (7) are arranged on a side of the light-guiding plate (2) away from the optical film material assembly (4); light-guiding grid points (8) are arranged on the central light-emitting area (6) and the corner light-emitting areas (7); and the light-guiding grid points (8) at the corner light-emitting areas (7) are gradually reduced from the inside to the outside.

2. The backlight display module for improving the mura problem at the end corner of the module according to claim 1, characterized in that: The number of light-guiding mesh points (8) in the middle light-emitting area (6) is greater than the number of the largest light-guiding mesh points (8) in the end corner light-emitting area (7).

3. The backlight display module for improving the mura problem at the end corner of the module according to claim 2, characterized in that: The end angle light-emitting area (7) comprises a right angle (701) and a circular arc (702), wherein the right angle (701) and the circular arc (702) are connected via two straight sides (703), the length of each side of the right angle (701) is 1 / 20 to 1 / 25 of the circumference of the light guide plate (2), and the length of the straight side (703) is 1 / 2 of the length of the side of the right angle (701).

4. The backlight display module for improving the mura problem at the end corner of the module according to claim 1, characterized in that: The display assembly (3) comprises a cover plate (301) and a liquid crystal display screen (302); the cover plate (301) is bonded to the liquid crystal display screen (302) via a full-bonding adhesive (303); and the cover plate (301) is fixedly connected to the iron frame (1).

5. The backlight display module for improving the mura problem at the end corner of the module according to claim 1, characterized in that: The optical film assembly (4) comprises a first brightness enhancement film (401), a second brightness enhancement film (402), and a diffusion film (403) which are connected in sequence, and the diffusion film (403) is bonded to the light guide plate (2).

6. The backlight display module for improving the mura problem at the end corner of the module according to claim 5, characterized in that: A reflective film (404) is installed between the iron frame (1) and the light guide plate (2).

7. The backlight display module for improving the mura problem at the end corner of the module according to claim 5, characterized in that: The light-guiding mesh point (8) is provided on a side close to the reflective film (404), and the light-guiding mesh point (8) is a spherical or ellipsoidal protrusion.

8. The backlight display module for improving the mura problem at the end corner of the module according to claim 7, characterized in that: The thickness of the light guide plate (2) is 0.5-1.0 mm, and the particle size of the light guide dots (8) is 0.2-0.3 mm.

9. The backlight display module for improving the mura problem at the end corner of the module according to claim 5, characterized in that: A boss (9) is fixedly connected to the interior of the iron frame (1), the reflective film (404) is located inside the boss (9), the light guide plate (2) is mounted on the boss (9), and a gap is left between the light guide grid points (8) and the reflective film (404).

10. The backlight display module for improving the mura problem at the end corner of the module according to claim 9, characterized in that: A sealing gasket (10) is installed between the boss (9) and the light guide plate (2).

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