LED lamp panel and backlight module

Abstract

The utility model relates to the technical field of display equipment, in particular to an LED lamp panel and a backlight module, the LED lamp panel comprises a substrate, the substrate is electrically connected with light-emitting chips, the light-emitting chips are wrapped with sealing glue layers, corresponding optical lens structures are arranged among the light-emitting chips, light rays are subjected to optical processing such as refraction, reflection and total reflection in the optical lens structures, and the light-emitting chips are connected with the backlight module. The optical lens structure guides light rays transversely emitted by the light-emitting chip to be reflected to the position above the substrate so as to achieve the purpose of uniform light mixing.

Description

[Technical field]

[0001] The utility model relates to the technical field of display equipment, in particular to an LED light board and a backlight module. [Background technology]

[0002] With the changes in consumer demand and the advancement of technology, the development direction of display device technology is moving towards lighter, thinner and more cost-effective products. Under this trend, various companies in the optoelectronics industry are seeking better product design directions and manufacturing strategies. One of the main directions is to control the light mixing distance within a smaller range in order to achieve thinner product design. However, as the light mixing distance decreases, since the light board is arranged in an array rectangle and the LED light is a circular halo, it is easy to present a dark or bright area in the center of the four LEDs; and the distance between the rows and columns of the rectangular arrangement of LEDs will be different, so that it will appear brighter or darker in the row and column direction, which ultimately leads to poor light uniformity or inconsistent color of the LED light board in visual effects. [Contents of the utility model]

[0003] In order to solve the problem of uneven light mixing of existing LEDs, the utility model provides an LED light board and a backlight module.

[0004] The solution to the technical problem of the utility model is to provide an LED lamp board including a substrate, to which a light-emitting chip is electrically connected, to which a sealing layer is wrapped, and between which corresponding optical lens structures are arranged. A pit is provided on a side of the optical lens structure away from the substrate, and a fence is formed around the pit.

[0005] Preferably, the ratio of the height of the bottom of the pit to the diameter of the optical lens structure is less than or equal to 0.6, and the ratio of the height of the highest point of the enclosure to the diameter of the optical lens structure is less than or equal to 0.8.

[0006] Preferably, a reflective layer is further provided on the substrate, and the optical lens structure and the light-emitting chip are provided on the reflective layer.

[0007] Preferably, a avoidance hole is arranged on the reflective layer corresponding to the light-emitting chip.

[0008] Preferably, the light emitting chips are arranged in an array on the substrate, and the optical lens structure is disposed at the center of the plurality of light emitting chips.

[0009] Preferably, the optical lens structures are distributed in a dot-shaped, line-shaped or mesh-shaped manner.

[0010] Preferably, there is a gap between the optical lens structure and the sealing layer.

[0011] Preferably, the ratio of the diameter of the optical lens structure to the distance between the two light-emitting chips is greater than or equal to 0.1.

[0012] Preferably, the light emitting chip can emit monochromatic light or multi-color light.

[0013] The utility model also provides a backlight module, and the backlight module comprises the LED light board as described above.

[0014] Compared with the prior art, the LED light board and backlight module provided by the utility model have the following advantages:

[0015] 1. The LED light board provided in the embodiment of the utility model has an optical lens structure arranged on the substrate corresponding to the light-emitting chip, and the light undergoes optical processing such as refraction, reflection, and total reflection in the optical lens structure. A pit is arranged on the side of the optical lens structure away from the substrate, and a barrier is formed around the pit, so that the light undergoes multiple reflections and refractions when passing through the optical lens structure, thereby more evenly covering the entire light-emitting area, reducing the occurrence of obvious light spots or uneven light, improving the utilization rate of the light-emitting chip, and reducing light energy loss; a reasonably designed optical lens structure can compensate for the light directed to one side of the substrate, so that the light is more evenly distributed in the area that needs lighting, thereby improving the visual effect and comfort.

[0016] 2. The LED light board provided in the embodiment of the utility model, the reflective layer can effectively reflect the light emitted by the light-emitting chip and the light emitted by the optical lens structure toward the outside of the substrate, thereby improving the overall light output quality of the light board.

[0017] 3. The LED light board provided in the embodiment of the utility model arranges the light-emitting chips in an array on a substrate, and sets an optical lens structure between or around the light-emitting chips. The light is more effectively controlled and guided by the optical lens structure, and the light generated by the light-emitting chips is effectively focused, scattered or reflected.

[0018] 4. The LED light board provided in the embodiment of the utility model has different optical lens structure distribution modes such as point, line or mesh, each with its own advantages in the LED light board under different lighting conditions. The point-distributed optical lens structure is suitable for the four-lamp center and can accurately control the direction of light. The linear distribution optical lens structure is suitable for LED light boards with stripe differences. The mesh distribution optical lens structure combines the advantages of point and line shapes, which can not only accurately control the directionality and intensity of light, but also diffuse and evenly distribute light.

[0019] 5. The LED light board provided in the embodiment of the utility model has a gap that can provide a channel for heat transfer, which helps to effectively dissipate the heat generated by the light-emitting chip into the surrounding environment, reduce the direct contact between the optical lens structure and the sealing layer, and prevent the optical lens structure from being affected by the sealing layer.

[0020] 6. In the LED light board provided in the embodiment of the utility model, as the distance between the light-emitting chips increases, the diameter of the optical lens structure also increases in the same proportion, which can improve the optical efficiency, capture more lateral light, cover a wider area, and reduce uneven lighting or optical failure between the optical lens structure and the light-emitting chips.

[0021] 7. The backlight module provided in the embodiment of the utility model has the same beneficial effects as the above-mentioned LED light board, which will not be described in detail here.

Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a partial side view of the LED light board provided by the first embodiment of the utility model Figure 1 .

[0024] Figure 2 It is a schematic diagram of the light conduction path of the LED lamp board provided in the first embodiment of the utility model.

[0025] Figure 3 It is a top view of the LED lamp board provided by the second embodiment of the utility model.

[0026] Figure 4 It is a top view of the LED lamp board provided in the third embodiment of the utility model.

[0027] Figure 5 It is a top view of the LED lamp board provided in the fourth embodiment of the utility model.

[0028] Figure 6 It is a block diagram of a backlight module provided by the fifth embodiment of the utility model.

[0029] Description of the accompanying drawings:

[0030] 100, LED light board;

[0031] 1. Substrate; 2. Light-emitting chip; 3. Sealing layer; 4. Optical lens structure; 5. Reflection layer;

[0032] 41. Pit; 42. Enclosure; 51. Avoidance hole. [Specific implementation method]

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0036] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0037] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] See also Figure 1-Figure 2 An LED light board 100 includes a substrate 1, a light emitting chip 2 is electrically connected to the substrate 1, a sealing layer 3 is wrapped on the light emitting chip 2, and a corresponding optical lens structure 4 is arranged between the light emitting chips 2.

[0039] Specifically, the sealing layer 3 is a transparent optical material that protects and fixes the light-emitting chip 2. The sealing layer 3 isolates water vapor. At the same time, the sealing layer 3 has certain optical refractive properties. When light passes through the sealing layer 3, its propagation direction will be deflected to a certain extent, so that the light can be better focused or diffused.

[0040] Specifically, the light beam laterally directed toward the optical lens structure 4 will undergo optical processing such as refraction, reflection, and total reflection in the optical lens structure 4 .

[0041] Preferably, the light transmission path of the lateral light refracted into the optical lens structure 4 is as follows: Figure 2 As shown, the optical lens structure 4 configured in this way can deflect and transmit the lateral light to the other side of the substrate 1 to achieve the purpose of light uniformity.

[0042] Furthermore, a pit 41 is provided on a side of the optical lens structure 4 away from the substrate 1 , and a barrier 42 is formed around the pit 41 .

[0043] Specifically, the pit 41 on the optical lens structure 4 is formed by dispensing glue, and different angles of inclination are formed between the pit 41 and the enclosure 42. The inclination provides a refraction or reflection angle for the lateral light parallel to the optical lens structure 4, so as to better guide the light parallel to the substrate 1 to above the substrate 1.

[0044] It can be understood that the pit 41 is a process of increasing reflection or refraction of the light incident on the optical lens structure 4, guiding the light incident parallel to the optical lens structure 4 to be reflected above the substrate 1. Its specific shape can be a bowl-shaped, inverted triangle, cube, etc., which is not specifically limited in the present utility model, as long as it can guide the light parallel to the substrate 1 to the substrate 1. In this embodiment, Figure 1 The pit 41 is in a bowl-cup shape.

[0045] Specifically, the ratio of the height of the bottom of the pit 41 to the diameter of the optical lens structure 4 is less than or equal to 0.6, and the ratio of the height of the highest point of the enclosure 42 to the diameter of the optical lens structure 4 is less than or equal to 0.8.

[0046] As an implementation scheme, the bottom height h of the pit 41 (e.g. Figure 1 h) is 1mm-2mm, and the diameter R of the optical lens structure 4 (such as Figure 1 R in is 3mm-4mm, and the height H of the highest point of the enclosure 42 (such as Figure 1 The H) is 1mm-2mm. By adjusting the ratio of the bottom height h of the pit 41 to the diameter R of the optical lens structure 4 and the ratio of the highest height H of the enclosure 42 to the diameter R of the optical lens structure 4 within the optimal range, the distribution and irradiation range of light in the optical lens structure 4 can be controlled.

[0047] Understandably, see Figure 2 When light enters the pit 41, the height difference between the bottom and the enclosure 42 will cause the light to be reflected or refracted, thereby increasing the propagation path of the light in the optical lens structure 4 so that the light is more focused above the optical lens structure 4, enhancing the uniform light effect. A larger height difference can make the light shine more concentratedly on a specific area, while a smaller height difference can achieve a wider lighting range to meet different lighting needs.

[0048] Furthermore, the height of the lowest point of the pit 41 is greater than the height of the light emitting chip 2 on the substrate 1 .

[0049] Furthermore, a reflective layer 5 is provided on the substrate 1 , and the optical lens structure 4 and the light emitting chip 2 are provided on the reflective layer 5 .

[0050] It can be understood that the reflective layer 5 reflects the lateral light guided into the optical lens structure 4 to the outside of the optical lens structure 4, changing the direction of the lateral light so that the light emitted by the light-emitting chip 2 can be more evenly distributed on one side of the substrate 1, thereby improving the utilization rate of light and thus improving the overall light output quality of the LED lamp board 100.

[0051] Specifically, in this embodiment, the reflective layer 5 is reflective paper; this design can reduce the overall volume of the LED light board 100.

[0052] Specifically, in this embodiment, the substrate 1 , the reflective layer 5 and the light emitting chip 2 are stacked, and the light emitting chip 2 is disposed on the substrate 1 and is exposed through the reflective layer 5 .

[0053] Please continue reading Figure 1 , there is a avoiding hole 51 on the reflective layer 5 corresponding to the light emitting chip 2. It can be understood that the avoiding hole 51 can avoid the light emitting chip 2 to prevent the reflective layer 5 from blocking the light emitting chip 2.

[0054] Optionally, the avoidance hole 51 may be circular, square or other shapes. Specifically, in this embodiment, the avoidance hole 51 is set to be circular with the center corresponding to the middle area of ​​the light emitting chip 2 .

[0055] Furthermore, the area of ​​the avoidance hole 51 is larger than the cross-sectional area of ​​the light emitting chip 2 , which can further prevent the reflective layer 5 from obstructing the light emitting of the light emitting chip 2 .

[0056] Furthermore, the optical lens structure 4 includes reflective glue, and the reflective glue is transparent glue and / or white glue.

[0057] It can be understood that the reflective adhesive effectively improves the light homogenization capability of the optical lens structure 4. Furthermore, the optical lens structure 4 can be formed by coating one or more types of reflective adhesives once or multiple times.

[0058] Furthermore, the light emitting chip 2 can emit monochromatic light or multi-color light.

[0059] Optionally, the light color of the reflective glue may be the same as or different from the light color emitted by the light emitting chip 2. Specifically, in this embodiment, the light color of the reflective glue may be the same as the light color emitted by the light emitting chip 2.

[0060] Furthermore, there is a gap between the optical lens structure 4 and the sealing layer 3 .

[0061] Specifically, the width of the gap depends on the optical requirements. The larger the illumination area that needs to be improved, the larger the diameter of the optical lens structure 4, and thus the smaller the gap between the optical lens structure 4 and the sealing layer 3. The gap avoids local extrusion between the sealing layer 3 and the optical lens structure 4 while avoiding heat concentration between the optical lens structure 4 and the sealing layer 3.

[0062] Furthermore, the ratio of the diameter R of the optical lens structure 4 to the distance L between the two light-emitting chips 2 is greater than or equal to 0.1.

[0063] Specifically, see Figure 3 In LED light panels 100 of different sizes, the diameter R of the optical lens structure 4 (eg Figure 3 R in the figure) increases as the distance L between the light emitting chips 2 (such as Figure 3 When the size of the LED light board 100 increases, the diameter R of the optical lens structure 4 (such as Figure 3 The distance L between the light emitting chips 2 is not specifically limited in the present invention, as long as it can meet the optical performance requirements.

[0064] It can be understood that the optical lens structure 4 with a larger diameter covers a wider area, captures more lateral light, and focuses or guides it directly above the substrate 1, thereby improving the optical efficiency.

[0065] Furthermore, the light emitting chips 2 are arranged in an array on the substrate 1 , and the optical lens structure 4 is disposed at the center of the plurality of light emitting chips 2 .

[0066] Please combine Figure 3 The second embodiment of the utility model further provides another LED lamp board 100 , in which the light emitting chips 2 are arranged in an array on the substrate 1 .

[0067] Preferably, the optical lens structure 4 is disposed at the center of the four light-emitting chips 2 , and the optical lens structure 4 is distributed in a point shape.

[0068] It can be understood that the center of the four light-emitting chips 2 is more likely to be brighter or darker than directly above the light-emitting chip 2. The optical lens structure 4 is distributed in a point shape in the center of the four light-emitting chips 2, guiding the light emitted laterally by the four light-emitting chips 2 to be reflected directly above the substrate 1, so as to achieve the purpose of uniform light mixing.

[0069] Preferably, as an implementable embodiment, Figure 3 The diameter R of the optical lens structure 4 shown is 3.5 mm, and the height H of the highest point of the enclosure 42 is 1.1 mm. It is arranged at the center of the four light-emitting chips 2, wherein the distance between every two light-emitting chips 2 is 7.5 mm. The light emitted laterally by the four light-emitting chips 2 is guided to the top of the substrate 1 through optical processing such as refraction, reflection, and total reflection in the optical lens structure 4, which can reduce the mixed light distance from the original 3 mm to less than 1.5 mm under the same size, thereby reducing the loss and scattering of light and improving the transmission efficiency of the optical system.

[0070] Specifically, if the centers of the four light-emitting chips 2 are darker, a larger light-guiding area is required, and accordingly, the diameter of the optical lens structure 4 will also be adjusted to increase so as to guide more lateral light to the top of the substrate 1 .

[0071] Furthermore, the optical lens structure 4 is disposed between two rows of light-emitting chips 2 and / or between two columns of light-emitting chips 2 .

[0072] Please combine Figure 4 The third embodiment of the utility model further provides another LED light board 100, in which the optical lens structure 4 is distributed linearly.

[0073] Optionally, the optical lens structure 4 may be arranged in a straight line and / or a curve. Specifically, in this embodiment, the optical lens structure 4 is arranged in a straight line.

[0074] Please combine Figure 5 The fourth embodiment of the utility model further provides another LED light board 100 as a modified implementation mode. In this embodiment, the optical lens structure 4 is distributed in a mesh shape.

[0075] It can be understood that when the optical lens structure 4 is disposed between two adjacent rows of light-emitting chips 2 and between two adjacent columns of light-emitting chips 2 , the optical lens structure 4 is in a grid shape as a whole.

[0076] See also Figure 6 The fifth embodiment of the utility model further provides a backlight module, including the LED light board 100 described above, which has the same beneficial effects as the LED light board 100 and will not be described in detail here.

[0077] Compared with the prior art, the LED light board and backlight module provided by the utility model have the following advantages:

[0078] 1. The LED light board provided in the embodiment of the utility model has an optical lens structure arranged on the substrate corresponding to the light-emitting chip, and the light undergoes optical processing such as refraction, reflection, and total reflection in the optical lens structure. A pit is arranged on the side of the optical lens structure away from the substrate, and a barrier is formed around the pit, so that the light undergoes multiple reflections and refractions when passing through the optical lens structure, thereby more evenly covering the entire light-emitting area, reducing the occurrence of obvious light spots or uneven light, improving the utilization rate of the light-emitting chip, and reducing light energy loss; a reasonably designed optical lens structure can compensate for the light directed to one side of the substrate, so that the light is more evenly distributed in the area that needs lighting, thereby improving the visual effect and comfort.

[0079] 2. The LED light board provided in the embodiment of the utility model, the reflective layer can effectively reflect the light emitted by the light-emitting chip and the light emitted by the optical lens structure toward the outside of the substrate, thereby improving the overall light output quality of the light board.

[0080] 3. The LED light board provided in the embodiment of the utility model arranges the light-emitting chips in an array on a substrate, and sets an optical lens structure between or around the light-emitting chips. The light is more effectively controlled and guided by the optical lens structure, and the light generated by the light-emitting chips is effectively focused, scattered or reflected.

[0081] 4. The LED light board provided in the embodiment of the utility model has different optical lens structure distribution modes such as point, line or mesh, each with its own advantages in the LED light board under different lighting conditions. The point-distributed optical lens structure is suitable for the four-lamp center and can accurately control the direction of light. The linear distribution optical lens structure is suitable for LED light boards with stripe differences. The mesh distribution optical lens structure combines the advantages of point and line shapes, which can not only accurately control the directionality and intensity of light, but also diffuse and evenly distribute light.

[0082] 5. The LED light board provided in the embodiment of the utility model has a gap that can provide a channel for heat transfer, which helps to effectively dissipate the heat generated by the light-emitting chip into the surrounding environment, reduce the direct contact between the optical lens structure and the sealing layer, and prevent the optical lens structure from being affected by the sealing layer.

[0083] 6. In the LED light board provided in the embodiment of the utility model, as the distance between the light-emitting chips increases, the diameter of the optical lens structure also increases in the same proportion, which can improve the optical efficiency, capture more lateral light, cover a wider area, and reduce uneven lighting or optical failure between the optical lens structure and the light-emitting chips.

[0084] 7. The backlight module provided in the embodiment of the utility model has the same beneficial effects as the above-mentioned LED light board, which will not be described in detail here.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED light board, characterized in that: It includes a substrate, a light-emitting chip is electrically connected to the substrate, a sealing layer is wrapped on the light-emitting chip, corresponding optical lens structures are arranged between the light-emitting chips, a pit is arranged on a side of the optical lens structure away from the substrate, and a fence is formed around the pit.

2. The LED light board according to claim 1, characterized in that: The ratio of the height of the bottom of the pit to the diameter of the optical lens structure is less than or equal to 0.6, and the ratio of the height of the highest point of the enclosure to the diameter of the optical lens structure is less than or equal to 0.

8.

3. The LED light board according to claim 1, characterized in that: A reflective layer is also arranged on the substrate, and the optical lens structure and the light-emitting chip are arranged on the reflective layer.

4. The LED light board according to claim 3, characterized in that: The reflective layer is provided with avoidance holes corresponding to the light emitting chip.

5. The LED light board according to claim 1, characterized in that: The light emitting chips are arranged in an array on the substrate, and the optical lens structure is arranged at the center of a plurality of the light emitting chips.

6. The LED light board according to claim 1, characterized in that: The optical lens structure is distributed in a point-like, line-like or mesh-like manner.

7. The LED light board according to claim 1, characterized in that: There is a gap between the optical lens structure and the sealing layer.

8. The LED light board according to claim 1, characterized in that: The ratio of the diameter of the optical lens structure to the distance between the two light-emitting chips is greater than or equal to 0.

1.

9. The LED light board according to claim 1, characterized in that: The light emitting chip can emit monochromatic light or multi-color light.

10. A backlight module, characterized in that: The backlight module includes the LED light board as described in any one of claims 1-9.

Images