Backlight module and display device

Abstract

The invention discloses a backlight module and a display device. The backlight module comprises a first light-emitting area, and the first light-emitting area comprises a plurality of first-type light-emitting units; the lamp beads in the first type of light-emitting units comprise the center lamp bead and the at least two peripheral lamp beads, the at least two peripheral lamp beads are evenly distributed on the virtual circle with the center lamp bead as the circle center, by means of the arrangement of the center lamp bead and the peripheral lamp beads, the light-emitting brightness of the first type of light-emitting units is improved, and the peripheral lamp beads are evenly distributed around the center lamp bead, so that the light-emitting brightness of the first type of light-emitting units is improved. The light-emitting uniformity of the first type of light-emitting units is guaranteed, the overall light-emitting brightness and light-emitting uniformity of the first light-emitting area are further guaranteed, and the brightness reminding requirement of a specific area in the backlight module is met.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a backlight module and display device. Background Technology

[0002] Currently, for LCD monitors, in special applications, it is necessary to display specific areas of the LCD screen at high brightness. However, existing backlight driver chips cannot further increase the backlight brightness by increasing the current value, making it difficult to meet specific brightness requirements. Therefore, designing an LCD monitor capable of local dimming has become an urgent need. Summary of the Invention

[0003] This invention provides a backlight module and display device to improve the luminous brightness of local areas and meet display requirements.

[0004] In a first aspect, the present invention provides a backlight module including a first light-emitting region, the first light-emitting region including a plurality of first-type light-emitting units;

[0005] The first type of light-emitting unit includes a central light-emitting bead and at least two peripheral light-emitting beads, which are evenly distributed on a virtual circle centered on the central light-emitting bead.

[0006] In a second aspect, the present invention provides a display device comprising the backlight module described in any one of the first aspects.

[0007] The technical solution of this invention includes a backlight module comprising a first light-emitting area, the first light-emitting area comprising a plurality of first-type light-emitting units; the LEDs in the first-type light-emitting units include a central LED and at least two peripheral LEDs, the at least two peripheral LEDs being evenly distributed on a virtual circle centered on the central LED; by setting a plurality of LEDs in the first-type light-emitting units, the luminous brightness of the first-type light-emitting units is improved; and by setting the peripheral LEDs to be evenly distributed around the central LED, the luminous uniformity of the first-type light-emitting units is ensured, thereby improving the overall luminous brightness and luminous uniformity of the first light-emitting area and meeting the brightness reminder requirements of a specific area in the backlight module.

[0008] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of a first light-emitting region provided in an embodiment of the present invention;

[0011] Figure 2 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0012] Figure 3 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0013] Figure 4 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0014] Figure 5 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0015] Figure 6 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0016] Figure 7 A graph showing the relationship between the number of peripheral LED beads and the brightness enhancement factor is provided in an embodiment of the present invention;

[0017] Figure 8 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0018] Figure 9 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0019] Figure 10 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0020] Figure 11 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0021] Figure 12 This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present invention;

[0022] Figure 13 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention;

[0023] Figure 14This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present invention;

[0024] Figure 15 This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present invention;

[0025] Figure 16 for Figure 1 A schematic diagram of the cross-sectional structure along the middle AA';

[0026] Figure 17 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0027] 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 of the present invention. 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 scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Figure 1 This is a schematic diagram of the structure of a first light-emitting region provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention. Figure 6 A schematic diagram of another first light-emitting region provided in an embodiment of the present invention, as shown below. Figures 1-6As shown, the backlight module includes a first light-emitting area 101, which includes a plurality of first-type light-emitting units 102; the LEDs in the first-type light-emitting units 102 include a central LED 103 and at least two peripheral LEDs 104, which are evenly distributed on a virtual circle centered on the central LED 103.

[0030] The backlight module is a core component of the LCD panel, providing a light source to the liquid crystal layer to drive the display. The backlight module contains multiple LEDs, which can be divided into light-emitting areas. Independent control of different light-emitting areas allows for brightness adjustment based on display requirements. The backlight module includes a first light-emitting area 101, which can be a high-brightness area to meet specific display needs.

[0031] like Figure 1 As shown, the first light-emitting area 101 includes multiple first-type light-emitting units 102. Each first-type light-emitting unit 102 includes a central LED 103 and at least two peripheral LEDs 104. By arranging multiple LEDs in the same first-type light-emitting unit 102, the luminous brightness of the first-type light-emitting unit 102 is ensured. At least two peripheral LEDs 104 are evenly distributed on a virtual circle centered on the central LED 103. The peripheral LEDs 104 can provide brightness compensation for the central LED 103, thereby improving the luminous brightness of the first-type light-emitting unit 102.

[0032] The structures of the central LED 103 and the peripheral LEDs 104 can be the same or different. For example, assuming the structures of the central LED 103 and the peripheral LEDs 104 are different, the brightness of the central LED 103 is 1 nit, and the brightness of the peripheral LEDs 104 is 2 nits. In this case, the peripheral LEDs 104 can compensate for the brightness of the central LED 103, and the influence of each peripheral LED 104 on the brightness compensation of the central LED 103 is X. Figure 1 and Figure 2 As shown, the first type of light-emitting unit 102 includes two peripheral LEDs 104, with an included angle of 180° between them. The actual brightness of the first type of light-emitting unit 102 is (A + 2*2A*X) nits. The included angle between two adjacent LEDs refers to the sector angle formed by the two adjacent LEDs relative to the center of the virtual circle. In one example, the central LED 103 can be positioned at the center of the virtual circle.

[0033] like Figure 3 As shown, the first type of light-emitting unit 102 includes three peripheral LED beads 104, with an included angle of 120° between any two adjacent LED beads. The actual brightness of the first type of light-emitting unit 102 is (A + 3 * 2A * X) nits. Figure 4As shown, the first type of light-emitting unit 102 includes four peripheral LED beads 104, with an included angle of 90° between any two adjacent LED beads. The actual brightness of the first type of light-emitting unit 102 is (A + 4 * 2A * X) nits. Figure 5 As shown, the first type of light-emitting unit 102 includes five peripheral LED beads 104, with an included angle of 72° between any two adjacent LED beads. The actual brightness of the first type of light-emitting unit 102 is (A + 5 * 2A * X) nits. Figure 6 As shown, the first type of light-emitting unit 102 includes six peripheral LED beads 104, and the included angle between two adjacent LED beads is 60°. At this time, the actual brightness of the first type of light-emitting unit 102 is (A+6*2A*X)nit.

[0034] In summary, when N peripheral LEDs 104 are provided, the actual brightness of the first type of light-emitting unit 102 satisfies A*(1+2N*X)nit, where the value of X ranges from 0 to 1. Figure 7 A graph showing the relationship between the number of peripheral LEDs and the brightness enhancement factor is provided for an embodiment of the present invention, as shown below. Figure 7 As shown, the brightness enhancement factor of the first type of light-emitting unit 102 is directly proportional to the number of peripheral LED beads 104. However, as the number of peripheral LED beads 104 gradually increases, the growth rate of the brightness enhancement factor will gradually decrease. Considering the spatial size of the first light-emitting area 101 and the heat dissipation performance of the backlight module, the number of peripheral LED beads 104 can be reasonably set according to the actual design requirements to ensure the light-emitting brightness and light-emitting uniformity of the first type of light-emitting unit 102.

[0035] In this embodiment of the invention, the first type of light-emitting unit includes a central light-emitting unit and at least two peripheral light-emitting units. The at least two peripheral light-emitting units are evenly distributed on a virtual circle centered on the central light-emitting unit. By setting multiple light-emitting units in the first type of light-emitting unit, the luminous brightness of the first type of light-emitting unit is improved. Furthermore, by setting the peripheral light-emitting units to be evenly distributed around the central light-emitting unit, the luminous uniformity of the first type of light-emitting unit is ensured, thereby improving the overall luminous brightness and luminous uniformity of the first luminous area.

[0036] Optional, continue to refer to Figures 1-7 In the first type of light-emitting unit 102, the number of peripheral LED beads 104 is less than or equal to 7. Since when the number of peripheral LED beads 104 is greater than 7, increasing the number of peripheral LED beads 104 does not significantly improve the brightness of the first type of light-emitting unit 102. Furthermore, considering the limited area of ​​the first type of light-emitting unit 102, the number of peripheral LED beads 104 in the first type of light-emitting unit 102 can be set to be less than or equal to 7 to ensure the light-emitting effect of the first type of light-emitting unit 102 and avoid excessive interference from the peripheral LED beads 104 on the heat dissipation of the first type of light-emitting unit 102.

[0037] Since the first light-emitting area 101 includes multiple first-type light-emitting units 102, to ensure the uniformity of light emission in the first light-emitting area 101, at least two first-type light-emitting units 102 can be provided with the same number of peripheral LED beads 104. Providing at least two first-type light-emitting units 102 with the same number of peripheral LED beads 104 ensures symmetrical light distribution and avoids regional brightness unevenness caused by differences in the number of LED beads. For example, as... Figures 1-6 As shown, the first light-emitting area 101 includes nine first-type light-emitting units 102. The number of peripheral LED beads 104 in each first-type light-emitting unit 102 is the same, and the arrangement of peripheral LED beads 104 in each first-type light-emitting unit 102 is the same, ensuring that the light-emitting brightness of each first-type light-emitting unit 102 is the same. The same control logic can be used to drive each first-type light-emitting unit 102, thereby effectively simplifying the control and production difficulties.

[0038] Based on the above embodiments, when the same number of peripheral LED beads 104 exist in the first type of light-emitting unit 102, the peripheral LED beads 104 in different first type of light-emitting units 102 have different arrangement methods. Several feasible setting methods are shown below.

[0039] As one possible implementation method, Figure 8 A schematic diagram of another first light-emitting region provided in an embodiment of the present invention, as shown below. Figure 8As shown, multiple first-type light-emitting units 102 are arranged in an array along a first direction X1 and a second direction X2, with the first direction X1 and the second direction X2 intersecting. The first-type light-emitting units 102 include adjacent first light-emitting units 1021 and second light-emitting units 1022. Two peripheral LEDs 104 in the first light-emitting unit 1021 are arranged along the first direction X1, and two peripheral LEDs 104 in the second light-emitting unit 1022 are arranged along the second direction X2. For adjacent first light-emitting units 1021 and second light-emitting units 1022, when the number of peripheral LEDs 104 is two, for example, when the two peripheral LEDs 104 in the first light-emitting unit 1021 are arranged along the first direction X1, one peripheral LED 104 is located at a 0° azimuth angle on a virtual circle centered on the central LED 103, and the other peripheral LED 104 is located at a 180° azimuth angle on a virtual circle centered on the central LED 103. At this time, the two peripheral LEDs 104 in the second light-emitting unit 1022 are arranged along the second direction X2, that is, one peripheral LED 104 is located at a 90° azimuth angle on a virtual circle centered on the central LED 103, and the other peripheral LED 104 is located at a 270° azimuth angle on a virtual circle centered on the central LED 103. By symmetrically arranging the peripheral LEDs 104 in the first light-emitting unit 1021 and the second light-emitting unit 1022 in the horizontal or vertical direction, the difficulty of control wiring is simplified, the brightness distribution of different light-emitting areas is balanced, and the overall light emission uniformity of the first light-emitting area 101 is guaranteed.

[0040] As another possible implementation method Figure 9 A schematic diagram of another first light-emitting region provided in an embodiment of the present invention, as shown below. Figure 9As shown, multiple first-type light-emitting units 102 are arranged in an array along a first direction X1 and a second direction X2, with the first direction X1 and the second direction X2 intersecting. The first-type light-emitting unit 102 includes a first light-emitting unit 1021 and a second light-emitting unit 1022 arranged adjacent to each other. Two peripheral LED beads 104 in the first light-emitting unit 1021 are arranged along a third direction X3, and two peripheral LED beads 104 in the second light-emitting unit 1022 are arranged along a fourth direction X4. The third direction X3 is perpendicular to the fourth direction X4, and the angle between the third direction X3 and the first direction X1 is 45°. For adjacent first light-emitting unit 1021 and second light-emitting unit 1022, when both have two peripheral LEDs 104, for example, when the two peripheral LEDs 104 in the first light-emitting unit 1021 are arranged along a third direction X3, that is, one peripheral LED 104 is located at a 45° azimuth angle on a virtual circle centered on the central LED 103, and the other peripheral LED 104 is located at a 225° azimuth angle on the same virtual circle. At this time, the two peripheral LEDs 104 in the second light-emitting unit 1022 are arranged along a second direction X2, that is, one peripheral LED 104 is located at a 135° azimuth angle on a virtual circle centered on the central LED 103, and the other peripheral LED 104 is located at a 315° azimuth angle on the same virtual circle. By arranging the peripheral LED beads 104 in the first light-emitting unit 1021 and the second light-emitting unit 1022 in a diagonal symmetrical manner, the brightness transition of different light-emitting areas is made uniform, thus ensuring the overall light-emitting uniformity of the first light-emitting area 101.

[0041] As another possible implementation method Figure 10 A schematic diagram of another first light-emitting region provided in an embodiment of the present invention, as shown below. Figure 10As shown, the first type of light-emitting unit 102 includes a third light-emitting unit 1023 and a fourth light-emitting unit 1024 arranged adjacent to each other; the peripheral LED beads 104 in the third light-emitting unit 1023 include a first LED bead 1041, a second LED bead 1042 and a third LED bead 1043, and the peripheral LED beads 104 in the fourth light-emitting unit 1024 include a fourth LED bead 1044, a fifth LED bead 1045 and a sixth LED bead 1046; the central LED bead 103 in the third light-emitting unit 1023 points in the direction x1 toward the first LED bead 1041, which is opposite to the direction x2 in the fourth light-emitting unit 1024 where the central LED bead 103 points toward the fourth LED bead 1044. For the adjacent third light-emitting unit 1023 and fourth light-emitting unit 1024, when the number of peripheral LEDs 104 is three, the peripheral LEDs 104 in the third light-emitting unit 1023 include a first LED 1041, a second LED 1042, and a third LED 1043. The first LED 1041, the second LED 1042, and the third LED 1043 are evenly arranged on a virtual circle centered on the central LED 103. For example, the first LED 1041 is located on the virtual circle centered on the central LED 103. At a 0° azimuth angle on the simulated circle, the second LED 1042 is located at a 120° azimuth angle on a virtual circle centered on the central LED 103, and the third LED 1043 is located at a 240° azimuth angle on the virtual circle centered on the central LED 103; the peripheral LEDs 104 in the fourth light-emitting unit 1024 include the fourth LED 1044, the fifth LED 1045, and the sixth LED 1046, which are centered on the central LED 103. The LEDs are evenly arranged on a virtual circle. The central LED 103 in the third light-emitting unit 1023 points in the direction of the first LED 1041, which is opposite to the direction of the central LED 103 in the fourth light-emitting unit 1024 pointing in the direction of the fourth LED 1044. Similarly, the central LED 103 in the third light-emitting unit 1023 points in the direction of the second LED 1042, which is opposite to the direction of the central LED 103 in the fourth light-emitting unit 1024 pointing in the direction of the fifth LED 1045. The direction x1 from LED 103 to the third LED 1043 is opposite to the direction x2 from the central LED 103 in the fourth light-emitting unit 1024 to the sixth LED 1046. At this time, the fourth LED 1044 is located at a 180° azimuth angle on a virtual circle centered on the central LED 103, the fifth LED 1045 is located at a 300° azimuth angle on the same virtual circle, and the sixth LED 1046 is located at a 60° azimuth angle. By reasonably setting the placement of the peripheral LEDs 104, brightness compensation for the central LED 103 is achieved at multiple angles, further improving the luminous brightness and uniformity of the first light-emitting area 101.

[0042] Furthermore, the first type of light-emitting unit 102 can be differentiated, with at least two first type of light-emitting units 102 having different numbers of peripheral LED beads 104. This results in different luminous brightness in different luminous areas, allowing the first type of light-emitting unit 102 with higher luminous brightness to compensate for the lower luminous brightness of the first type of light-emitting unit 102, thus ensuring the overall luminous uniformity of the first luminous area 101.

[0043] Optional, Figure 11 A schematic diagram of another first light-emitting region provided in an embodiment of the present invention, as shown below. Figure 11 As shown, multiple first-type light-emitting units 102 are arranged in an array along a first direction X1 and a second direction X2, with the first direction X1 intersecting the second direction X2; the first-type light-emitting units 102 include a fifth light-emitting unit 1025 and a sixth light-emitting unit 1026, along the first direction X1 or the second direction X2, with the sixth light-emitting unit 1026 located between the edge of the fifth light-emitting unit 1025 and the first light-emitting area 101; the number of peripheral LED beads 104 in the fifth light-emitting unit 1025 is less than the number of peripheral LED beads 104 in the sixth light-emitting unit 1026.

[0044] For example, such as Figure 11 As shown, the first light-emitting area 101 includes 3*3 light-emitting units. The fifth light-emitting unit 1025 is located in the central area, and the sixth light-emitting unit 1026 is located between the fifth light-emitting unit 1025 and the edge of the first light-emitting area 101. The number of sixth light-emitting units 1026 can be four, that is, the sixth light-emitting units 1026 are located directly above, directly below, directly to the left, and directly to the right of the fifth light-emitting unit 1025, respectively. The brightness of the sixth light-emitting unit 1026 can provide a certain brightness compensation for the brightness of the fifth light-emitting unit 1025. The outermost LED beads 10 of the fifth light-emitting unit 1025 can be configured... The number of LEDs 104 in the fifth light-emitting unit 1025 is less than the number of LEDs 104 in the sixth light-emitting unit 1026. The fifth light-emitting unit 1025 has 2 LEDs 104 in its outer periphery and the sixth light-emitting unit 1026 has 3 LEDs 104 in its outer periphery. The fifth light-emitting unit 1025 is used to ensure the basic luminous brightness of the central area. Then, the luminous brightness of the fifth light-emitting unit 1025 is compensated by the sixth light-emitting unit 1026, which has a larger luminous brightness, so as to balance the brightness difference between the fifth light-emitting unit 1025 and the sixth light-emitting unit 1026 and ensure the luminous uniformity of the first light-emitting area 101.

[0045] Further reference Figure 11The first type of light-emitting unit 102 also includes a seventh light-emitting unit 1027. The distance between the central LED 103 in the sixth light-emitting unit 1026 and the central LED 103 in the fifth light-emitting unit 1025 is a first distance L1, and the distance between the central LED 103 in the seventh light-emitting unit 1027 and the central LED 103 in the fifth light-emitting unit 1025 is a second distance L2. The first distance L1 is less than the second distance L2. The number of peripheral LEDs 104 in the sixth light-emitting unit 1026 is less than the number of peripheral LEDs 104 in the seventh light-emitting unit 1027.

[0046] In this configuration, the first light-emitting area 101 comprises 3*3 light-emitting units. The fifth light-emitting unit 1025 is located in the central area. The sixth and seventh light-emitting units 1026 and 1027 are both located between the fifth light-emitting unit 1025 and the edge of the first light-emitting area 101. There are four sixth and seventh light-emitting units 1026 and 1027. Since the first distance L1 between the central LED 103 in the sixth light-emitting unit 1026 and the central LED 103 in the fifth light-emitting unit 1025 is less than the second distance L2 between the central LED 103 in the seventh light-emitting unit 1027 and the central LED 103 in the fifth light-emitting unit 1025, the seventh light-emitting unit 1027 is located to the upper left, lower left, upper right, and lower right of the fifth light-emitting unit 1025. Therefore, the brightness of the seventh light-emitting unit 1027 can also provide some brightness compensation for the brightness of the fifth light-emitting unit 1025. However, the seventh light-emitting unit 1026... Compared to the sixth light-emitting unit 1026, 27 is farther away from the fifth light-emitting unit 1025. To ensure the brightness compensation effect of the seventh light-emitting unit 1027 on the fifth light-emitting unit 1025, the number of peripheral LEDs 104 in the sixth light-emitting unit can be set to be less than the number of peripheral LEDs 104 in the seventh light-emitting unit 1027. For example, the number of peripheral LEDs 104 in the sixth light-emitting unit 1026 is 3 and the number of peripheral LEDs 104 in the seventh light-emitting unit 1027 is 4. The fifth light-emitting unit 1025 is used to ensure the basic luminous brightness of the central area. Then, the luminous brightness of the fifth light-emitting unit 1025 is compensated by the seventh light-emitting unit 1027, which has a higher luminous brightness, so as to balance the brightness difference between the fifth light-emitting unit 1025 and the seventh light-emitting unit 1027, as well as the brightness difference between the sixth light-emitting unit 1026 and the seventh light-emitting unit 1027, and ensure the luminous uniformity of the first light-emitting area 101.

[0047] Specifically, when the brightness of the fifth light-emitting unit 1025 is 'a', the brightness of the sixth light-emitting unit 1026 is 'b', and the brightness of the seventh light-emitting unit 1027 is 'c', the brightness compensation influence of each light-emitting unit on the brightness of the light-emitting units directly above, below, to the left, and to the right is 'Y', and the brightness compensation influence of the light-emitting units to the upper left, lower left, upper right, and lower right is 'Z', the actual brightness of the fifth light-emitting unit 1025 is 'a+4*b*Y+4*c*Z', the actual brightness of the sixth light-emitting unit 1026 is 'b+(a+2c)*Y+2*b*Z', and the actual brightness of the seventh light-emitting unit 1027 is 'c+2*b*Y+a*Z'. For example, the fifth light-emitting unit 1025 has two peripheral LEDs 104, the sixth light-emitting unit 1026 has three peripheral LEDs 104, and the seventh light-emitting unit 1027 has... Unit 1027 has four peripheral LEDs 104. The brightness of the central LED 103 is 1 nit, and the brightness of the peripheral LEDs 104 is 2 nit. The brightness 'a' of the fifth light-emitting unit 1025 satisfies A*(1+4*X) nit, the brightness 'b' of the sixth light-emitting unit 1026 satisfies A*(1+6*X) nit, and the brightness 'c' of the seventh light-emitting unit 1027 satisfies A*(1+8*X) nit. Typically, Y = 0.3508 and Z = 0.0687. At this time, the actual brightness of the fifth light-emitting unit 1025 is A*(2.678+14.6176*X), the actual brightness of the sixth light-emitting unit 1026 is A*(2.839+16.4372*X), and the actual brightness of the seventh light-emitting unit 1027 is A*(2.4086+6.4184*X).

[0048] also, Figure 12 This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present invention, as shown below. Figure 12 As shown, the backlight module also includes a second light-emitting area 105, which includes multiple second-type light-emitting units 106; the LEDs in the second-type light-emitting units 106 only include the central LED 103. The second light-emitting area 105 can be at least partially arranged around the first light-emitting area 101. The second light-emitting area 105 includes multiple second-type light-emitting units 106. Usually, the brightness of the second light-emitting area 105 is less than that of the first light-emitting area 101. The second light-emitting area 105 does not have a high brightness display requirement. In this case, only the central LED 103 can be set in the second-type light-emitting unit 106, without the need for peripheral LEDs 104. The central LED 103 in the second-type light-emitting unit 106 and the central LED 103 in the first-type light-emitting unit 102 can be controlled using the same control logic, reducing the control difficulty and ensuring the luminous effect of the first light-emitting area 101 and the second light-emitting area 105.

[0049] Based on the above embodiments, the structures of the central LED 103 and the peripheral LED 104 may be the same or different, and corresponding control methods may be adopted. The following shows a feasible setting method.

[0050] As one possible implementation method, Figure 13 This is a schematic diagram of another structure of the first light-emitting region provided in an embodiment of the present invention. Figure 14 This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present invention, as shown below. Figure 13 and Figure 14 As shown, the central LED 103 and the peripheral LED 104 have the same structure; the backlight module also includes a buck-boost circuit 107, and both the central LED 103 and the peripheral LED 104 are electrically connected to the buck-boost circuit 107.

[0051] When the central LED 103 and the peripheral LED 104 have the same structure, the central LED 103 and the peripheral LED 104 can be controlled by the same buck-boost circuit 107, which reduces the control difficulty, avoids setting up an additional buck-boost circuit 107, and reduces the complexity and manufacturing cost of the backlight module.

[0052] As another possible implementation method Figure 15 This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present invention, as shown below. Figure 1 and 15 As shown, the central LED 103 and the peripheral LED 104 have different structures; the backlight module also includes a first buck-boost circuit 108 and a second buck-boost circuit 109, with the central LED 103 electrically connected to the first buck-boost circuit 108 and the peripheral LED 104 electrically connected to the second buck-boost circuit 109.

[0053] Since the central LED 103 and the peripheral LED 104 have different structures and require different driving voltages, the backlight module is equipped with a first buck-boost circuit 108 electrically connected to the central LED 103 and a second buck-boost circuit 109 electrically connected to the peripheral LED 104. This allows different buck-boost circuits to control the light emission of different types of LEDs, ensuring the light emission effect of the central LED 103 and the peripheral LED 104.

[0054] Further reference Figure 15The first buck-boost circuit 108 provides a first voltage to the central LED 103, and the second buck-boost circuit 109 provides a second voltage to the peripheral LEDs 104. The first voltage is lower than the second voltage. By powering the central LED 103 with the first buck-boost circuit 108 and providing a higher second voltage to the peripheral LEDs 104 with the second buck-boost circuit 109, the luminous brightness of the central LED 103 is lower than that of the peripheral LEDs 104, thereby increasing the luminous brightness of the first type of light-emitting unit 102.

[0055] In addition, continue to refer to Figure 14 and Figure 15 The backlight module also includes a power supply 110, a step-down circuit 111, a control unit 112, and a backlight driver chip 113. The power supply 110 supplies power to the step-down circuit 111, the first step-up / step-down circuit 108, and the second step-up / step-down circuit 109. The step-down circuit 111, the control unit 112, the center LED 103, and the peripheral LEDs 104 are all connected to the backlight driver chip 113. For example, the power supply 110 can output a supply voltage of 6-18V, and the step-down circuit 111 can step down the supply voltage output by the power supply 110 to output a voltage of 3.3V to the control unit 112 and the backlight driver chip 113. Figure 14 As shown, the step-up / step-down circuit 107 can step up and down the supply voltage output from the power supply 110 to output an 8V voltage to the center LED 103 and the peripheral LED 104, or as... Figure 15 As shown, the first step-up / step-down circuit 108 can step up / down the power supply voltage and output an 8V first voltage to the center LED 103, and the second step-up / step-down circuit 109 can step up / down the power supply voltage and output a 16V second voltage to the peripheral LED 104, so as to enable the center LED 103 and the peripheral LED 104 to display different brightness.

[0056] Optional, such as Figure 15 As shown, the central LED 103 includes a single-crystal LED; the peripheral LED 104 includes a dual-crystal LED and / or a polycrystalline LED.

[0057] Among them, a single crystal lamp includes a single light-emitting chip, a dual crystal lamp includes two light-emitting chips connected in series, and a polycrystalline lamp includes multiple light-emitting chips connected in series. The central lamp bead 103 includes a single crystal lamp, and the peripheral lamp beads 104 include dual crystal lamps and / or polycrystalline lamps. This makes the voltage required for the central lamp bead 103 lower than that for the peripheral lamp beads 104, and the brightness of the peripheral lamp beads 104 higher than that of the central lamp bead 103. The peripheral lamp beads 104 compensate for the brightness of the central lamp bead 103 to ensure the uniformity of light emission of the first type of light-emitting unit 102.

[0058] Optional, Figure 16 for Figure 1A schematic diagram of the cross-sectional structure along the middle AA', as shown below. Figure 16 As shown, the first type of light-emitting unit 102 also includes a reflector cup 114, with the central LED 103 located at the center of the reflector cup 114. Each first light-emitting unit 1021 is provided with a reflector cup 114. The reflector cup 114 can improve the overall luminous efficiency and brightness by reflecting more light, making the light spot more concentrated and improving the display effect. The reflector cup 114 forms a receiving cavity to accommodate the central LED 103 and at least two peripheral LEDs 104 of the first type of light-emitting unit 102. Placing the central LED 103 at the center of the reflector cup 114 ensures the basic brightness of the central area, and, together with the peripheral LEDs 104, improves the overall luminous brightness of the first type of light-emitting unit 102.

[0059] Figure 17 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, such as... Figure 17 As shown, the display device 200 includes the backlight module 100 described in the above embodiments.

[0060] It should be noted that since the display device provided in this embodiment has the same or corresponding beneficial effects as the backlight module in the above embodiments, it will not be described in detail here. The display device provided in this embodiment of the invention can be... Figure 17 The in-vehicle display device shown can also be any electronic product with display function, including but not limited to the following categories: television, laptop, desktop monitor, tablet computer, digital camera, smart bracelet, smart glasses, mobile phone, medical equipment, industrial control equipment, touch interactive terminal, etc. The embodiments of the present invention do not make any special limitations on this.

[0061] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A backlight module, characterized in that, It includes a first light-emitting region, which includes a plurality of first-type light-emitting units; The first type of light-emitting unit includes a central light-emitting bead and at least two peripheral light-emitting beads, which are evenly distributed on a virtual circle centered on the central light-emitting bead.

2. The backlight module according to claim 1, characterized in that, In the first type of light-emitting unit, the number of peripheral LED beads is less than or equal to 7.

3. The backlight module according to claim 1, characterized in that, At least two of the first type of light-emitting units have the same number of the peripheral LED beads.

4. The backlight module according to claim 3, characterized in that, Multiple light-emitting units of the first type are arranged in an array along a first direction and a second direction, wherein the first direction and the second direction intersect. The first type of light-emitting unit includes a first light-emitting unit and a second light-emitting unit arranged adjacent to each other. The two peripheral LEDs in the first light-emitting unit are arranged along the first direction, and the two peripheral LEDs in the second light-emitting unit are arranged along the second direction.

5. The backlight module according to claim 3, characterized in that, Multiple light-emitting units of the first type are arranged in an array along a first direction and a second direction, wherein the first direction and the second direction intersect. The first type of light-emitting unit includes a first light-emitting unit and a second light-emitting unit arranged adjacent to each other. The two peripheral LEDs in the first light-emitting unit are arranged along a third direction, and the two peripheral LEDs in the second light-emitting unit are arranged along a fourth direction. The third direction is perpendicular to the fourth direction, and the angle between the third direction and the first direction is 45°.

6. The backlight module according to claim 3, characterized in that, The first type of light-emitting unit includes a third light-emitting unit and a fourth light-emitting unit arranged adjacent to each other; The peripheral LEDs in the third light-emitting unit include a first LED, a second LED, and a third LED; the peripheral LEDs in the fourth light-emitting unit include a fourth LED, a fifth LED, and a sixth LED. The direction in which the central LED in the third light-emitting unit points to the first LED is opposite to the direction in which the central LED in the fourth light-emitting unit points to the fourth LED.

7. The backlight module according to claim 1, characterized in that, At least two of the first type of light-emitting units have different numbers of the peripheral LED beads.

8. The backlight module according to claim 7, characterized in that, Multiple first-type light-emitting units are arranged in an array along a first direction and a second direction, wherein the first direction and the second direction intersect. The first type of light-emitting unit includes a fifth light-emitting unit and a sixth light-emitting unit. Along the first direction or the second direction, the sixth light-emitting unit is located between the fifth light-emitting unit and the edge of the first light-emitting area. The number of peripheral LED beads in the fifth light-emitting unit is less than the number of peripheral LED beads in the sixth light-emitting unit.

9. The backlight module according to claim 8, characterized in that, The first type of light-emitting unit further includes a seventh light-emitting unit. The distance between the central LED in the sixth light-emitting unit and the central LED in the fifth light-emitting unit is a first distance, and the distance between the central LED in the seventh light-emitting unit and the central LED in the fifth light-emitting unit is a second distance. The first distance is less than the second distance. The number of peripheral LED beads in the sixth light-emitting unit is less than the number of peripheral LED beads in the seventh light-emitting unit.

10. The backlight module according to claim 1, characterized in that, It also includes a second light-emitting region, which includes a plurality of second-type light-emitting units; The lamp beads in the second type of light-emitting unit include only the central lamp bead.

11. The backlight module according to claim 1, characterized in that, The central LED bead and the peripheral LED beads have the same structure; The backlight module also includes a buck-boost circuit, and the central LED and the peripheral LEDs are both electrically connected to the buck-boost circuit.

12. The backlight module according to claim 1, characterized in that, The central LED bead and the peripheral LED beads have different structures; The backlight module further includes a first buck-boost circuit and a second buck-boost circuit. The central LED is electrically connected to the first buck-boost circuit, and the peripheral LEDs are electrically connected to the second buck-boost circuit.

13. The backlight module according to claim 12, characterized in that, The first step-up / step-down circuit provides a first voltage to the center LED, and the second step-up / step-down circuit provides a second voltage to the peripheral LEDs, wherein the first voltage is less than the second voltage.

14. The backlight module according to claim 12, characterized in that, The central LED chip includes a single-crystal lamp; The peripheral LEDs include dual-crystal lamps and / or polycrystalline lamps.

15. The backlight module according to claim 1, characterized in that, The first type of light-emitting unit also includes a reflector cup, with the central LED located at the center of the reflector cup.

16. A display device, characterized in that, Includes the backlight module as described in any one of claims 1-15.

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