Backlight FPC, backlight module and display module

Abstract

The utility model discloses a kind of backlight FPC, backlight module and display module, it is related to display module field, backlight FPC, it includes FPC body, FPC body includes the main part, bending section and plug-in part connected as a whole, the main part is welded with several mini LED lamp beads of equidistant arrangement, the surface of the mini LED lamp bead is covered with microlens layer, backlight module and display module are all included backlight FPC;The utility model uses mini LED lamp bead as light source in backlight module, mini LED lamp bead mixed light distance is small, reduces light path long place, reduces interval light interference, and size small can be densely arranged, can independently regulate and control micro area brightness, and the thickness of backlight module can be reduced, the area of non-display area is made small, it is convenient to realize ultra-thin full screen structure, simultaneously using microlens layer covers mini LED lamp bead can change light propagation direction, reduce the grain feeling of screen, improve the uniformity of display brightness.

Description

Technical Field

[0001] This utility model relates to the field of display module technology, and in particular to a backlight FPC, a backlight module, and a display module. Background Technology

[0002] The widespread use of smartphones has enriched people's daily lives. With the rapid development of technology, consumers have increasingly higher requirements for the display effect of mobile phone screens. As the light source component of a mobile phone screen, the backlight's light emission effect directly affects the display effect. Currently, smartphone backlights commonly use traditional LED lamp structures. Patent application number CN201620751426.5 discloses a backlight FPC and display module, including a light guide plate and at least one lamp strip located on the side of the light guide plate. Each lamp strip includes a circuit board and at least two sets of LED lamp groups attached to the circuit board, and each LED lamp group is independently controlled.

[0003] In backlight structures, LED light sources typically employ a side-lit design. Ordinary LEDs, due to their larger size, require a greater mixing distance to evenly diffuse light. If the mixing distance is insufficient, the light does not mix adequately within the light guide plate, easily producing localized bright and dark stripes. Furthermore, ordinary LEDs, due to their large size and low number of LEDs per unit area, cannot achieve precise zoned light control. Additionally, uneven heat dissipation in ordinary LEDs can lead to edge aging and inconsistent luminous efficiency, resulting in uneven brightness in the display. Therefore, this utility model discloses a backlight FPC, a backlight module, and a display module to solve these problems. Utility Model Content

[0004] Based on this, it is necessary to address the aforementioned technical issues by providing a backlight FPC, a backlight module, and a display module. By using mini LED beads as the light source in the backlight module, the mini LED beads have a short light mixing distance, reducing the length of the optical path, reducing inter-area light interference, and their small size allows for dense arrangement, enabling independent control of micro-area brightness. Furthermore, the thickness of the backlight module can be reduced, minimizing the area of ​​the non-display area, which facilitates the realization of an ultra-thin full-screen structure. At the same time, using a microlens layer to cover the mini LED beads can change the direction of light propagation, reduce screen graininess, and improve the uniformity of display brightness.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A backlight FPC includes an FPC body, the FPC body including a main body, a bent section and an insertion part that are connected as one piece, a plurality of mini LED beads arranged at equal intervals are welded on the main body, and the surface of the mini LED beads is covered with a microlens layer.

[0007] As a preferred embodiment of the backlight FPC, backlight module and display module provided by this utility model, the radius of curvature of the microlens layer is 5–20 μm.

[0008] In a preferred embodiment of the backlight FPC, backlight module and display module provided by this utility model, the spacing between adjacent mini LED beads is less than 1.5mm, and at least 500 mini LED beads are provided per square centimeter.

[0009] In a preferred embodiment of the backlight FPC, backlight module and display module provided by this utility model, the mini LED beads are divided into at least two groups, and each group of mini LED beads is staggered so that adjacent mini LED beads are from different groups.

[0010] In a preferred embodiment of the backlight FPC, backlight module and display module provided by this utility model, the number of mini LED beads in each group of mini LED beads is the same.

[0011] In a preferred embodiment of the backlight FPC, backlight module and display module provided by this utility model, each group of mini LED beads is connected in series.

[0012] As a preferred embodiment of the backlight FPC, backlight module and display module provided by this utility model, the FPC body is provided with a driving line connected to each group of mini LED beads, the plug-in part is provided with a power supply pad, and the power supply pad is electrically connected to the driving line to form a closed loop for each group of mini LED beads.

[0013] As a preferred embodiment of the backlight FPC, backlight module and display module provided by this utility model, the mini LED beads are provided with a frame on the outside, and one side of the frame is provided with an opening, and the opening is in the light emission direction of the mini LED beads.

[0014] A backlight module comprising the aforementioned backlight FPC.

[0015] A display module includes a display screen and the aforementioned backlight module.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The backlight FPC, backlight module and display module provided by the present invention use mini LED beads as the light source in the backlight module. The mini LED beads have a small light mixing distance, reduce the length of the light path, reduce the light interference between areas, and their small size allows for dense arrangement. They can independently control the brightness of micro areas and reduce the thickness of the backlight module, making the area of ​​the non-display area smaller, which is conducive to realizing an ultra-thin full-screen structure. At the same time, using a microlens layer to cover the mini LED beads can change the direction of light propagation, reduce the graininess of the screen, and improve the uniformity of display brightness. Attached Figure Description

[0017] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the internal structure of the backlight FPC provided by this utility model;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 An external schematic diagram of the overall structure of the backlight FPC provided by this utility model;

[0021] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0022] Figure 5 A side view of the backlight module provided by this utility model;

[0023] Figure 6 This is a schematic diagram of the planar structure of the display module provided by this utility model.

[0024] The markings in the diagram are explained as follows:

[0025] 1. FPC body; 2. Main body; 3. Bending section; 4. Insertion section; 5. Mini LED lamp bead; 6. Microlens layer; 7. Drive circuit; 8. Power supply pad; 9. Frame; 10. Opening; 11. Glue frame; 12. Light guide plate; 13. Reflector; 14. Display screen. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] As described in the background technology, LED light sources in backlight structures generally adopt a side-lit design. Ordinary LEDs are relatively large and require a larger light mixing distance to diffuse light evenly. If the light mixing distance is insufficient, the light will not mix sufficiently in the light guide plate, which can easily produce local bright and dark stripes. Moreover, ordinary LEDs are relatively large and have a small number of LED beads per unit area, which makes it impossible to achieve fine zone light control. At the same time, ordinary LED beads are prone to edge aging due to uneven heat dissipation, resulting in inconsistent luminous efficiency and causing uneven brightness in the display.

[0028] To solve this technical problem, this utility model provides a backlight FPC, a backlight module, and a display module, which are applied in the field of display modules.

[0029] For details, please refer to Figure 1-4 The backlight FPC specifically includes an FPC body 1, which includes a main body 2, a bent section 3, and an insertion part 4 that are connected as one piece. A plurality of mini LED beads 5 are welded on the main body 2 at equal intervals, and the surface of the mini LED beads 5 is covered with a microlens layer 6.

[0030] For details, please refer to Figure 5 The backlight module includes the aforementioned backlight FPC.

[0031] For details, please refer to Figure 6 The display module includes the display screen 14 and the backlight module described above.

[0032] The backlight FPC, backlight module, and display module provided by this utility model use miniLED lamp beads 5 as the light source in the backlight module. The mini LED lamp beads 5 have a small light mixing distance, which reduces the length of the light path, reduces inter-area light interference, and their small size allows for dense arrangement. They can also independently control the brightness of micro-areas, and reduce the thickness of the backlight module, making the area of ​​the non-display area smaller, which is conducive to realizing an ultra-thin full-screen structure. At the same time, using a microlens layer 6 to cover the mini LED lamp beads 5 can change the direction of light propagation, reduce the graininess of the screen, and improve the uniformity of display brightness.

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] Example 1

[0037] Please refer to Figure 1-2 A backlight FPC is provided, comprising an FPC body 1, which is manufactured using conventional processes. The FPC body 1 is made of flexible polyimide (PI) material with a thickness of 0.05–0.15 mm. The FPC body 1 includes an integral main body 2, a bent section 3, and an insertion part 4. A plurality of equally spaced mini LED beads 5 are soldered onto the main body 2. Specifically, pads are provided on the main body, and the LED beads are soldered onto the pads. The surface of the mini LED beads 5 is covered with a microlens layer 6. The size of the mini LED beads 5 is 50–200 μm. Due to the small size of the mini LED beads 5, they emit light as point light sources. Direct illumination will cause obvious graininess on the screen. The microlens layer 6 can change the direction of light propagation through curved refraction, compressing the Lambertian light emission (120° divergence angle) of the mini LED beads 5 to below 80°, forming a collimated beam, thereby improving the uniformity of the display and avoiding bright and dark areas. At the same time, the lens reduces the mini LEDs' size. The LED beads have 5 internal total internal reflections, which improves the light output efficiency by 15-20% and reduces the loss of stray light.

[0038] Furthermore, the spacing between adjacent mini LED beads 5 is less than 1.5mm, and there are at least 500 mini LED beads 5 per square centimeter. This improves brightness and, together with the microlens layer 6, ensures that the light spots of adjacent mini LED beads 5 overlap by more than 30% on the light-incident surface of the light guide plate 12, thus eliminating dark bands at the source. The radius of curvature of the microlens layer 6 is 5–20μm. In this example, the radius of curvature of the microlens layer 6 is 10μm. The microlens layer 6 is formed on the surface of the LED package through photolithography.

[0039] Furthermore, the mini LED beads 5 are divided into at least two groups, and each group of mini LED beads 5 is staggered, so that adjacent mini LED beads 5 are from different groups. In this example, the mini LED beads 5 are divided into two groups and arranged in a staggered manner. In this example, the mini LED beads 5 in even-numbered positions are in one group, and the mini LED beads 5 in odd-numbered positions are in another group. By controlling the two sides of different groups of mini LED beads 5, different brightness displays can be achieved on the display screen 14. Combined with different power inputs of mini LED beads 5, multiple different brightness displays can be achieved. When high brightness is not required, only one group of mini LED beads 5 needs to be lit, reducing power consumption. In addition, the mini LED beads 5 in each group are connected in series, and the number of mini LED beads 5 in each group is the same, ensuring that the brightness of each group of mini LED beads 5 is the same. Furthermore, the FPC body 1 is provided with a drive line 7 connected to each group of mini LED beads 5, and the plug part 4 is provided with a power supply pad 8. The power supply pad 8 is electrically connected to the drive line 7 to form a closed loop for each group of mini LED beads 5.

[0040] like Figure 3-4 As shown, further, a frame 9 is provided on the outer side of the mini LED bead 5, and an opening 10 is provided on one side of the frame 9. The opening 10 corresponds one-to-one with the mini LED bead 5, and the opening 10 is the light emission direction of the mini LED bead 5. The frame 9 is a rubber strip, which is formed by pouring glue into a molding mold and then cooling it. The frame 9 is used to shield the mini LED bead 5 from light to avoid light crosstalk and affect the display effect. At the same time, a reflective layer is provided on the inner wall of the frame 9, which can reflect light and improve the light utilization rate.

[0041] Example 2

[0042] Please refer to Figure 5 This embodiment provides a backlight module, which includes a backlight FPC as described in Embodiment 1, and also includes a plastic frame 11. A light guide plate 12 is provided inside the plastic frame 11. The backlight FPC is located on one side of the light guide plate 12, and the light emission direction of the miniLED beads 5 is located on the light input side of the light guide plate 12. A reflective sheet 13 is provided between the light guide plate 12 and the plastic frame 11. The other structures of the backlight module are conventional structures.

[0043] Example 3

[0044] Please refer to Figure 6This embodiment provides a display module, which includes the backlight module in Embodiment 2. A display screen 14 is also provided on the upper surface of the backlight module. This display module is used in a smartphone, and the backlight FPC is located below the display screen 14.

[0045] The working principle of the backlight FPC, backlight module and display module provided by this utility model is as follows: By using mini LED beads 5 as the light source in the backlight module, the mixing distance of mini LED beads 5 is small, reducing the length of the light path, reducing inter-area light interference, and the small size allows for dense arrangement, independent control of micro-area brightness, and can reduce the thickness of the backlight module, making the area of ​​the non-display area smaller, which is conducive to realizing an ultra-thin full-screen structure. At the same time, using a microlens layer 6 to cover mini LED beads 5 can change the direction of light propagation, reduce the graininess of the screen, and improve the uniformity of display brightness.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A backlight FPC, comprising an FPC body, said FPC body including a main body portion, a bent section and a connector portion integrally connected, characterized in that, The main body is welded with a number of mini LED beads arranged at equal intervals, and the surface of the mini LED beads is covered with a microlens layer.

2. The backlight FPC according to claim 1, characterized in that, The radius of curvature of the microlens layer is 5–20 μm.

3. A backlight FPC according to claim 1, characterized in that, The spacing between adjacent mini LED beads is less than 1.5mm.

4. A backlight FPC according to claim 1, characterized in that, The mini LED beads are divided into at least two groups, and each group of mini LED beads is staggered so that adjacent mini LED beads are from different groups.

5. A backlight FPC according to claim 4, characterized in that, The number of mini LEDs in each group is the same.

6. A backlight FPC according to claim 4, characterized in that, Each group of mini LED beads is connected in series.

7. A backlight FPC according to claim 4, characterized in that, The FPC body is provided with a driving circuit connected to each group of mini LED beads, and the plug-in part is provided with a power supply pad. The power supply pad is electrically connected to the driving circuit to form a closed loop for each group of mini LED beads.

8. A backlight FPC according to claim 1, characterized in that, The mini LED bead has a frame on its outer side, and one side of the frame has an opening that is in the direction of light emission from the mini LED bead.

9. A backlight module, characterized in that, Includes the backlight FPC as described in any one of claims 1-8.

10. A display module, characterized in that, Includes a display screen and a backlight module as described in claim 9.

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