Light-emitting device and backlight module

Abstract

A light-emitting device and a backlight module. The light-emitting device includes a base, a light-emitting diode (LED), and a package. The LED is located on one side of the base. The package is located on the side of the base and covers the LED. The package includes a base and a lens portion. The lens portion corresponds to the top of the LED. The lens portion has a lens portion surface. The lens portion surface conforms to a cubic Bezier curve. The cubic Bezier curve has a starting point and an end point. The starting point is located on the base surface of the base, and the end point corresponds to the top of the LED. The lens portion surface has a recessed portion at the end point. The light-emitting device of the present invention has a lens portion whose lens portion surface is constructed using a cubic Bezier curve. The lens portion is illuminated by the LED to expand the light-emitting angle. While maintaining the same area in the backlight module and ensuring the picture effect, the spacing between the light-emitting devices can be increased, significantly reducing the number of light-emitting devices used and reducing the cost of the entire backlight module.

Description

Technical Field

[0001] The present invention relates to a light emitting device and a backlight module, and in particular to a light emitting device and a backlight module having a sub-millimeter light emitting diode (Mini Light Emitting Diode, Mini LED). Background Art

[0002] Liquid crystal displays (LCDs) rely on backlight modules as their light source. These modules are located on the backside of the display panel, providing uniform light to the display panel and displaying the image. Backlight modules contain various optical components, such as light guides, and utilize point sources of sub-millimeter light emitting diodes (Mini LEDs) as their primary light source. Each sub-millimeter light emitting diode (Mini LED) has a fixed light-emitting angle. For a 24-inch backlight module, for example, a significant number of Mini LEDs are required. For example, if multiple light-emitting elements are arranged throughout the entire backlight module cavity with each element spaced 10mm apart in both the horizontal and vertical directions, a total of 1,537 Mini LEDs (53 times 29) are required. Consequently, the number and cost of Mini LEDs remain high.

[0003] Therefore, it is necessary to provide a light emitting device and a backlight module to solve the above problems. Summary of the Invention

[0004] In view of this, some embodiments provide a light-emitting device comprising a base, a light-emitting diode (LED), and an encapsulation. The LED is located on one side of the base. The encapsulation is located on the side of the base and covers the LED. The encapsulation includes a base and a lens portion. The lens portion corresponds to the upper portion of the LED. The lens portion has a lens portion surface. The lens portion surface conforms to a cubic Bézier curve. The cubic Bézier curve has a starting point and an end point. The starting point is located on the base surface of the base, and the end point corresponds to the upper portion of the LED. The lens portion surface has a recessed portion at the end point.

[0005] In some embodiments, the surface of the lens portion is a curved surface formed by rotating a cubic Bezier curve 360 ​​degrees about the central axis, the central axis is a plumb line passing through the end point, the plumb line and the Z axis are on the same axis, the plumb section of the base surface is on the same axis as the Y axis, the Z axis intersects and is perpendicular to the Y axis, the starting point is at a coordinate position where the Y axis is substantially equal to 0, and the end point is at a coordinate position where the Z axis is substantially equal to 0.

[0006] In some embodiments, the base has a height and a length, and the cubic Bezier curve parameter range is: the starting point coordinate range is (-77% multiplied by the length / 2, the Y axis is substantially equal to 0) to (-91% multiplied by the length / 2, the Y axis is substantially equal to 0), the starting point has a starting angle between the Y axis and the tangent line of the cubic Bezier curve, the starting angle is tanβ equal to 8.80, the starting weight is 0.44 to 0.50, the starting tangent length is 0.300 mm (mm), the end point coordinate is (17% multiplied by the height, the Z axis is substantially equal to 0) to (33% multiplied by the height, the Z axis is substantially equal to 0), the end point has an end point angle between the Z axis and the tangent line of the cubic Bezier curve, the end point angle is tanα equal to -1.75, the end point weight is 0.42 to 0.46, and the end point tangent length is 0.275 mm (mm).

[0007] In some embodiments, the package body is made of a packaging glue material, and the refractive index of the lens portion is 1.52.

[0008] In some embodiments, the packaging body is made of epoxy resin, silicone or silicone packaging glue.

[0009] In some embodiments, the light distribution curve calculates that the light emitting angle of the lens portion is 166.30 degrees at 50% power.

[0010] In some embodiments, the area measured 5 mm above the LED is 94.20 mm 2 The spot coverage range.

[0011] In some embodiments, the height of the base is 0.25 mm to 0.35 mm, and the length of the base is 0.8 mm to 1.8 mm.

[0012] In some embodiments, the surface of the lens portion has a concave portion at the end position that curves from the outside to the inside and gradually shrinks, the bottom of the concave portion has a pointed portion, and the side wall of the concave portion has a curved portion with a curved surface shape.

[0013] According to some embodiments, a backlight module is provided, comprising a circuit board, a plurality of light-emitting devices, a diffuser, and a plurality of optical dies. Each light-emitting device is located on the circuit board, and the light-emitting device includes a base, a light-emitting diode, and a package. The light-emitting diode is located on one side of the base. The package is located on the side of the base and covers the light-emitting diode. The package includes a base and a lens portion. The lens portion corresponds to the upper portion of the light-emitting diode. The lens portion has a lens portion surface. The lens portion surface conforms to a cubic Bezier curve. The cubic Bezier curve has a starting point and an end point. The starting point is located on the base surface of the base, and the end point corresponds to the upper portion of the light-emitting diode. The lens portion surface has a recessed portion at the end point. The diffuser is located above the circuit board and is spaced apart from each other. The optical dies are located on the diffuser.

[0014] In some embodiments, an intersecting, vertical, and horizontal X-axis and Y-axis are defined on the circuit board, and the light-emitting devices are arranged on the circuit board with a spacing of 16 mm in the X-axis and Y-axis directions, and a total of 594 light-emitting devices are used.

[0015] In summary, according to some embodiments, a light-emitting device has a lens portion whose lens surface is constructed using a cubic Bezier curve. The lens portion is illuminated by a light-emitting diode and can expand the light-emitting angle. While maintaining the same area in the backlight module and ensuring the picture effect, the spacing between the light-emitting devices can be increased, thereby significantly reducing the number of light-emitting devices used and reducing the cost of the entire backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram illustrating the appearance of a light emitting device according to some embodiments is shown;

[0017] Figure 2 FIG. 1 is a schematic top view of a light emitting device according to some embodiments;

[0018] Figure 3 FIG2 shows a schematic side view of a light emitting device according to some embodiments;

[0019] Figure 4 FIG1 shows a schematic side view of a base portion and a lens portion according to some embodiments;

[0020] Figure 5 FIG2 is a side view showing an enlarged schematic diagram of a partial shape of a lens portion according to some embodiments;

[0021] Figure 6 A schematic diagram of constructing a partial shape of a cubic Bezier curve and establishing fixed-point parameters is shown according to some embodiments;

[0022] Figure 7 A schematic diagram of constructing a partial shape of a cubic Bezier curve and establishing a tangent length parameter is shown according to some embodiments;

[0023] Figure 8 A schematic diagram of constructing a partial shape of a cubic Bezier curve and establishing weight parameters according to some embodiments is shown;

[0024] Figure 9 A schematic diagram illustrating the light emission characteristics of a light emitting device according to some embodiments, and a comparison diagram of the light emission angles of a conventional Mini LED and a light emitting device are shown;

[0025] Figure 10 A schematic diagram of a light spot of a light emitting device according to some embodiments is shown;

[0026] Figure 11 A schematic diagram illustrating the arrangement of light-emitting devices in a backlight module according to some embodiments is shown;

[0027] Figure 12 A schematic diagram illustrating the optical effect of a light-emitting device in a backlight module according to some embodiments is shown, where the light-emitting devices 100 are arranged with a spacing D of 13 mm on the X axis and a spacing D of 13 mm on the Y axis;

[0028] Figure 13 A schematic diagram illustrating the optical effect of a light-emitting device in a backlight module according to some embodiments is shown, where the light-emitting devices 100 are arranged with a spacing D equal to 16 mm on the X axis and a spacing D equal to 16 mm on the Y axis;

[0029] Figure 14 A schematic diagram illustrating the optical effect of a light-emitting device in a backlight module according to some embodiments is shown, where the light-emitting devices 100 are arranged with a spacing D equal to 17 mm on the X axis and a spacing D equal to 17 mm on the Y axis;

[0030] Figure 15 A schematic top view illustrating the arrangement of light-emitting devices in a backlight module according to some embodiments is shown;

[0031] Figure 16 A schematic diagram illustrating a refractive index and a light distribution curve of a light emitting device according to some embodiments is shown, wherein the refractive index ranges from 1.1 to 1.9;

[0032] Figure 17 A schematic diagram illustrating a refractive index and a light distribution curve of a light emitting device according to some embodiments is shown, wherein the refractive index ranges from 1.45 to 1.65;

[0033] Figure 18 A schematic diagram illustrating the appearance of a cubic Bezier curve with a maximum parameter value according to some embodiments is shown;

[0034] Figure 19 A schematic diagram illustrating a refractive index and a light distribution curve of a maximum value of a cubic Bezier curve parameter according to some embodiments is shown;

[0035] Figure 20 A schematic diagram illustrating a light spot with a maximum value of a cubic Bezier curve parameter according to some embodiments;

[0036] Figure 21 A schematic diagram illustrating the appearance of a cubic Bezier curve with minimum parameters according to some embodiments is shown;

[0037] Figure 22 A schematic diagram illustrating a refractive index and a light distribution curve of a cubic Bezier curve parameter minimum according to some embodiments; and

[0038] Figure 23 FIG. 4 is a schematic diagram illustrating a light spot with a minimum parameter of a cubic Bezier curve according to some embodiments.

[0039] Description of main component symbols:

[0040] 100 Light-emitting device

[0041] 200 backlight module

[0042] 1 base

[0043] 11 Silver-plated copper sheet

[0044] 2 LEDs

[0045] 21 Gold Thread

[0046] 3 Package

[0047] 31 base

[0048] 311 base surface

[0049] 32 Lens

[0050] 321 lens surface

[0051] 33 Cubic Bezier Curve

[0052] 331 Starting Point

[0053] 332 End

[0054] 333 First Control Point

[0055] 334 Second Control Point

[0056] 34 Depression

[0057] 341 cusp

[0058] 342 curved part

[0059] 5. Circuit Board

[0060] 61 Diffuser

[0061] 62 Optical Modules

[0062] D spacing

[0063] F spot

[0064] H Height

[0065] L length

[0066] O Center axis

[0067] M1 moves inward

[0068] M2 moves outward

[0069] M3 moves inward

[0070] M4 moves outwards

[0071] W Tangent length

[0072] W1 starting point tangent length

[0073] W2 End point tangent length

[0074] θ1 starting angle

[0075] θ2 End point angle

[0076] XX axis

[0077] YY axis

[0078] ZZ axis DETAILED DESCRIPTION

[0079] See also Figures 1 to 5 , Figure 1 is a schematic diagram of the appearance of the light emitting device 100, Figure 2 is a schematic top view of the light emitting device 100, Figure 3 is a side view schematic diagram of the light emitting device 100, Figure 4 is a side view of the base 31 and the lens portion 32, Figure 5 FIG2 is an enlarged side view of a portion of the lens portion 32. In some embodiments, the light emitting device 100 utilizes LED technology to shrink the size of a light emitting diode (LED) chip to 75 micrometers (μm) to 300 μm. The light emitting device 100 includes a base 1, a light emitting diode 2, and a package 3.

[0080] The light emitting diode 2 is located on one side of the base 1 .

[0081] The package body 3 is located on one side of the base 1 and covers the LED 2. The package body 3 includes a base 31 and a lens portion 32. The lens portion 32 corresponds to the upper side of the LED 2. The lens portion 32 has a lens portion surface 321. The lens portion surface 321 conforms to a cubic Bezier curve 33. The cubic Bezier curve 33 has a starting point 331 and an end point 332. The starting point 331 is located on the base surface 311 of the base 31. The end point 332 corresponds to the upper side of the LED 2 (for example, but not limited to, the center of the LED 2). The lens portion surface 321 has a recessed portion 34 at the end point 332.

[0082] See also Figures 1 to 3 In some embodiments, LED 2 is connected to a gold wire 21, which is fixed to the surface of base 1. Gold wire 21 is used to connect the contacts on the surface of base 1 to LED 2. The bottom of base 1 has a silver-plated copper sheet 11. LED 2 is a sub-millimeter light-emitting diode chip (Mini LED chip).

[0083] See also Figures 2 to 3 In some embodiments, encapsulation body 3 is injection-molded with an encapsulating glue material, covering and protecting LED 2. The dimensions of base 31 and lens portion 32 after encapsulation glue molding are equal to or smaller than the dimensions of base 1. When base 1 is placed in the mold and encapsulating glue is poured in, the injection encapsulating glue will cover LED 2 on base 1. After the encapsulating glue cures and forms encapsulation body 3, the glue will not flow under base 1.

[0084] In some embodiments, after the light emitting device 100 is injection molded with a packaging glue material, the packaging body 3 is made of an epoxy resin packaging glue material. The refractive index of the packaging body 3 is 1.52, which has a high refractive index effect.

[0085] See also Figure 1 、 Figure 4 and Figure 5 In some embodiments, the shape of the cubic Bezier curve 33 is composed of parameters such as the coordinates of the starting point 331, the starting point angle θ1 (tanβ), the starting point weight, the starting point tangent length W1, the coordinates of the end point 332, the end point angle θ2 (tanα), the end point weight, and the end point tangent length W2. The end point 332 is located at the center of the light-emitting diode 2, and the center of the lens portion 32 corresponds to the center of the light-emitting diode 2.

[0086] See also Figure 1 、 Figure 4 and Figure 5 In some embodiments, the lens portion surface 321 conforms to a cubic Bezier curve 33, which refers to two cubic Bezier curves 33 that are mirror images of each other on a vertical plane (viewed from the cross section of the lens portion 32, the endpoints 332 of the two cubic Bezier curves 33 are connected). In some embodiments, the lens portion 32 on the base 31 is a 360-degree rotational solid, presenting a donut shape as shown. Typically, the lens of a Mini LED is a regular rectangular parallelepiped (not shown).

[0087] In some embodiments, lens surface 321 is formed by rotating a vertical line through end point 332 360 degrees to form a curved surface. Specifically, lens surface 321 is formed by rotating a cubic Bézier curve 33 360 degrees about a central axis O. Central axis O is a vertical line through end point 332, coaxial with the Z axis. A vertical section of base surface 311 is coaxial with the Y axis, intersecting and perpendicular to the Y axis. Starting point 331 is located at a Y-axis coordinate position substantially equal to 0, and end point 332 is located at a Z-axis coordinate position substantially equal to 0. In other words, the cubic Bézier curve 33 on lens portion 32 is formed by rotating a circle around central axis O of base portion 31.

[0088] See also Figure 4 In some embodiments, the height H of the base 31 can be selected from a range of 0.25 mm to 0.35 mm, and the length L of the base 31 can be selected from a range of 0.8 mm to 1.8 mm. The ratio of the height H of the base 31 to the length L of the base 31 is 1:5. In some embodiments, the height H of the base 31 is 0.3 mm, and the length L of the base 31 is 1.3 mm.

[0089] Cubic Bezier curve parameter table:

[0090]

[0091] Please refer to the above table and Figure 1 、 Figure 4 and Figure 5 In some embodiments, the base 31 has a height H and a length L as viewed from a cross section of the base 31 . The parameter value range of the cubic Bezier curve 33 is as follows: the coordinate range of the starting point 331 is (-77% multiplied by the length L / 2, the Y axis is substantially equal to 0) to (-91% multiplied by the length L / 2, the Y axis is substantially equal to 0), the starting point 331 has a starting angle θ1 along the Y axis to the tangent line of the cubic Bezier curve 33, the starting angle θ1 is tanβ equal to 8.80, the starting weight factor (weight factor) is 0.44 to 0.50 (the value can be relatively controlled to move the curve inward M1 or outward M2), the starting tangent length W1 is 0.300 millimeters (mm), the coordinates of the end point 332 are (Z axis is substantially equal to 0, 17% multiplied by the height H) to (Z axis is substantially equal to 0, 33% multiplied by the height H), the end point 332 has an end angle θ2 along the Z axis to the tangent line of the cubic Bezier curve 33, the end angle θ2 is tanα equal to -1.75, the end weight factor (weight factor) The factor) is 0.42 to 0.46 (a larger or smaller value can relatively control the curve to move inward M3 or outward M4), and the end point tangent length W2 is 0.275 millimeters (mm).

[0092] See also Figure 1 、 Figure 4 and Figure 5 In some embodiments, when the starting point weight factor is between 0 and 0.5, the cubic Bezier curve 33 adjacent to the starting point 331 is finely controlled to move in the direction of the inward movement M1 arrow shown in the figure (moving toward the base 31). In some embodiments, when the starting point weight factor is between 0.5 and 1.0, the cubic Bezier curve 33 adjacent to the starting point 331 is finely controlled to move in the direction of the outward movement M2 arrow shown in the figure (moving away from the base 31).

[0093] See also Figure 1 、 Figure 4 and Figure 5 In some embodiments, when the endpoint weight factor is between 0 and 0.5, the cubic Bezier curve 33 adjacent to the endpoint 332 is finely controlled to move in the direction of the inward movement M3 arrow shown in the figure (moving toward the base 31). In some embodiments, when the endpoint weight factor is between 0.5 and 1.0, the cubic Bezier curve 33 adjacent to the endpoint 332 is finely controlled to move in the direction of the outward movement M4 arrow shown in the figure (moving away from the base 31).

[0094] See also Figures 6 to 8 , Figure 6 In order to construct the local outline diagram of the cubic Bezier curve 33, fixed point parameters are established. Figure 7 In order to construct the local outline diagram of the cubic Bezier curve 33, the tangent length W parameter is established. Figure 8 To construct a local outline diagram of a cubic Bézier curve 33, weight parameters are established. In some embodiments, a general cubic Bézier curve 33 parameter has five parameters: the parameters of the four points P0, P1, P2, and P3, and the t parameter. The cubic Bézier curve 33 parameter formula is: B(t) = P0(1-t)3 + 3P1t(1-t)2 + 3P2t2(1-t) + P3t3, where t∈[0,1]. The four points P0, P1, P2, and P3 define the cubic Bézier curve 33 in a plane or in three-dimensional space. The curve starts at P0 and moves toward P1, and then from P2 to P3, where t is a parameter between 0 and 1.

[0095] See also Figure 6 and Figure 7 In some embodiments, the cubic Bezier curve 33 is a curve that calculates the tangent angle in tangent mode. The angle of the tangent vector between the starting point 331 (P0) and the end point 332 (P3) is obtained by the tangent angle. The length of the established tangent is not zero, the tangent angle is calculated and the tangent length W is given. Please also refer to Figure 5 As shown, the distances between the starting point 331 (P0), the end point 332 (P3), the first control point 333 (P1) and the second control point 334 (P2) are established.

[0096] See also Figure 8 In some embodiments, the cubic Bezier curve 33 is fine-tuned using a weight control. Increasing the weight factor moves the curve outward, while decreasing the weight factor moves the curve inward. The valid value range is 0 to 1. As shown in the figure, mark 8A indicates the position of the curve controlled by a weight factor of 0, and mark 8B indicates the position of the curve controlled by a weight factor of 0.75.

[0097] See also Figure 9 , Figure 9 This diagram shows the luminous characteristics of the light-emitting device 100, comparing the luminous angles of a typical Mini LED and the light-emitting device 100. The left side of the figure shows the power percentage, and the center shows the angle. This is achieved by comparing the light distribution curves of a typical Mini LED and the light-emitting device 100 (using epoxy resin as the encapsulation adhesive, with a refractive index of 1.52).

[0098] In some embodiments, as shown in the figure, 50% power is indicated by the mark 9A, the mark 9B indicates the typical Mini LED emission angle, and the mark 9C indicates the emission angle of LED 2. At 50% power (mark 9A), by calculating the light distribution curve of light-emitting device 100 using optical analogy software, the emission angle of light-emitting device 100 is improved from the original 136.50 degrees to 166.30 degrees. Light emitted by LED 2 is reflected and refracted by base 31 and lens portion 32, increasing the effective divergence angle of the light. At 50% power, the emission angle of LED 2 ranges from approximately -80 degrees to 80 degrees, for a total emission angle of 166.30 degrees.

[0099] In some embodiments, the rightmost tip of the light distribution curve of the light-emitting device 100 corresponds to an intensity of approximately 90% to 100% power, and the center of the light distribution curve of the light-emitting device 100, at 0 degrees, corresponds to an intensity of approximately 30% power. As shown in the figure, the light from a typical Mini LED passes through the lens portion 32 and is concentrated at an angle such as the area marked 9D. However, the light from the light-emitting device 100 passes through the lens portion 32 and is diffused, illuminating an angle such as the area marked 9E, illuminating a uniform and wider area.

[0100] See also Figure 10 , Figure 10 In some embodiments, a test plane is set 5 mm above the light emitting diode 2, and the light emitting device 100 forms a spot with an area of ​​about 94.20 mm at the test plane. 2 The elliptical light spot F (as marked 10A in the figure) is formed. The energy chart is on the right side of the figure. The light emitting device 100 has a large light emitting angle, and the light spot F formed is relatively large. Generally, Mini LED forms an area of ​​about 50.24mm on the test plane. 2 By superimposing and comparing the two light spot pictures of the light-emitting device 100 and the general Mini LED (not shown), the coverage area of ​​the light spot F of the light-emitting device 100 is significantly larger than the coverage area of ​​the general Mini LED light spot.

[0101] In some embodiments, taking the uniformity of the light emitting device 100 as an example, the intensity of the inner region mark 10B (shown as a white block without color filling) of the mark 10A in the figure is the highest. The inner region mark 10B corresponds to the highest value portion of the mark 10B above the energy chart on the right side of the figure, and the light is diffused and the range of the light is increased. In some embodiments, adjusting the intensity of the inner region mark 10B to a lower level can increase the coverage of the entire light spot F, that is, expand the light emitting angle of the light emitting diode 2 and increase the spacing D between the light emitting diodes 2 (as shown in FIG. Figure 11 shown).

[0102] See also Figure 11 , Figure 11 Figure 2 is a schematic diagram illustrating the arrangement of light-emitting devices 100 within a backlight module 200. In some embodiments, nine light-emitting devices 100 are arranged within a backlight module 200 to create a backlight module 200 with an OD distance of 5 mm and an area of ​​50 mm x 50 mm. The encapsulation adhesive is made of epoxy resin, for example, with a refractive index of 1.52. By adjusting the spacing D between each light-emitting diode 2 along the X and Y axes, the optical effect is tested to determine the applicable range of the nine light-emitting devices 100.

[0103] See also Figures 11 to 14 , Figures 12 to 14 is a schematic diagram of the optical effect of the light emitting device 100 in the backlight module 200, Figure 12 The light emitting devices 100 are arranged such that the spacing D on the X axis is 13 mm and the spacing D on the Y axis is 13 mm. Figure 13 The light emitting devices 100 are arranged such that the spacing D on the X axis is equal to 16 mm and the spacing D on the Y axis is equal to 16 mm. Figure 14 The light emitting devices 100 are arranged with a spacing D of 17 mm on the X axis and a spacing D of 17 mm on the Y axis. In some embodiments, the optical effect of a backlight module 200 composed of 9 light emitting devices 100 is tested with the same spacing D in the X and Y axis directions, and the value range of the spacing D is between 13 mm and 17 mm. The optical effect is judged by the obviousness of the checkerboard shadows in the effect. In some embodiments, the maximum spacing D of the light emitting devices 100 arranged on the circuit board 5 in the X and Y axis directions is 16 mm (e.g. Figure 11 and Figure 13 As shown), if the spacing D between the light emitting devices 100 exceeds 16 mm (as shown Figure 14 As shown in the figure), the checkerboard shadow phenomenon will become very obvious and the effect is not good.

[0104] The test measured the optical effect of a backlight module composed of nine standard Mini LEDs, spaced equally along the X and Y axes within a range of 7mm to 11mm. The visual quality was determined by the apparent checkerboard shading within the resulting effect. The typical maximum spacing for Mini LEDs along the X and Y axes is 10mm. If the spacing between LEDs exceeds 11mm, the checkerboard shading becomes very noticeable, resulting in a poor result.

[0105] See also Figure 11 In some embodiments, the maximum arrangement spacing D of the light-emitting device 100 in the X-axis and Y-axis directions on the circuit board 5 in the backlight module 200 can reach 16 mm, which is a significant improvement over the maximum arrangement spacing D of 10 mm for general Mini LEDs in the X-axis and Y-axis directions.

[0106] See also Figure 15 , Figure 15 Schematic diagram of a top view of the arrangement of the light-emitting devices 100 in the backlight module 200. In some embodiments, taking a 24-inch backlight module 200 as an example, when the light-emitting devices 100 are used for arrangement, the entire backlight module 200 cavity is arranged with a spacing D equal to 16 mm in the X-axis and Y-axis directions, which requires 33 times 18, a total of 594 light-emitting devices 100, and the number and cost of the light-emitting devices 100 in the backlight module 200 of the same size are effectively reduced. When using general Mini LEDs for arrangement, the entire backlight module 200 cavity is arranged with a spacing D equal to 10 mm in the X-axis and Y-axis directions, which requires 53 times 29, a total of 1537 LEDs. Taking the arrangement of a 24-inch backlight module 200 as an example (such as Figure 15 As shown in FIG, the cost of using each light emitting device 100 will be reduced by 61.35% compared to the original luminous efficiency. When the size of the arranged backlight module 200 is further increased, the cost reduction rate is significantly improved.

[0107] In some embodiments, using the same unit price of LEDs but different numbers of LEDs, the cost of LEDs 2 using the light-emitting device 100 is 61.35% lower than that of conventional Mini LEDs. As the size of the backlight module 200 increases, the number and cost of each light-emitting device 100 can be further reduced.

[0108] In some embodiments, the plurality of light-emitting devices 100 may be arranged in the same direction (e.g., with the donut-shaped lens portions 32 arranged in the same longitudinal direction), and arranged in the same direction and spacing D along the X-axis and Y-axis within the entire cavity of the backlight module 200, but the present invention is not limited thereto. In some embodiments, the plurality of light-emitting devices 100 may be arranged in different directions (e.g., with the donut-shaped lens portions 32 arranged horizontally and the donut-shaped lens portions 32 arranged vertically used together), and arranged in different directions and spacing D along the X-axis and Y-axis within the entire cavity of the backlight module 200.

[0109] See also Figure 16 , Figure 16 Figure 1 is a diagram of the refractive index and light distribution curve of light-emitting device 100, with a refractive index range of 1.1 to 1.9. In some embodiments, when selecting the encapsulating glue material for light-emitting device 100, the test light distribution curves of encapsulating glue materials with a refractive index range of 1.1 to 1.9 are used. At 50% power, the light-emitting angle of light-emitting device 100 increases with increasing refractive index. When the refractive index of the encapsulating glue is lower than 1.3 (as shown by 16A in the figure), the light-emitting angle of light-emitting device 100 at 50% power does not significantly improve. When the refractive index of the encapsulating glue is higher than 1.6 (as shown by 16B in the figure), the light distribution curve of light-emitting device 100 exhibits a significant bump in the center (the elliptical area marked by 16C), indicating that the brightness of the central region of LED 2 is significantly higher, resulting in an uneven light spot and unsuitable for everyday use. The general requirement for the refractive index of the encapsulating glue material for light-emitting device 100 is between 1.4 and 1.6.

[0110] See also Figure 17 , Figure 17 Figure 1 shows the refractive index and light distribution curve of light-emitting device 100, with a refractive index range of 1.45 to 1.65. In some embodiments, detailed testing was conducted on encapsulating adhesive materials with a refractive index range of 1.45 to 1.65. The light distribution curves of light-emitting device 100 show that when the refractive index of the encapsulating adhesive exceeds 1.59 (as indicated by 17A in the figure), the light distribution curve of light-emitting device 100 exhibits a significant bump in the center (the elliptical area indicated by 17C). The optimal refractive index range for encapsulating adhesive materials is 1.45 to 1.59.

[0111] In some embodiments, the package body 3 can be made of epoxy resin, silicone, or hybrid packaging glue material, which can match the required refractive index.

[0112] See also Figures 18 to 23 , Figure 18 This is a schematic diagram of the appearance of the maximum value of the cubic Bezier curve 33 parameters. Figure 19 The diagram of the refractive index and light distribution curve for the maximum value of the 33 parameters of the cubic Bezier curve is shown below. Figure 20 This is a schematic diagram of the light spot with the maximum value of 33 parameters of the cubic Bezier curve. Figure 21 This is a schematic diagram of the appearance of the minimum value of the cubic Bezier curve 33 parameters. Figure 22 This is a diagram of the refractive index and light distribution curve for the minimum value of the cubic Bezier curve 33 parameters. Figure 23 Schematic diagram of a light spot with the minimum value of the parameter of the cubic Bezier curve 33. In some embodiments, the shape of the light distribution curve and the light spot effect of the lighting device 100 are used to determine the value range of the parameter of the cubic Bezier curve 33.

[0113] See also Figures 18 to 20 , Figures 18 to 20 The maximum value of the cubic Bezier curve 33 is shown in the figure, the light distribution curve and the light spot diagram. In some embodiments, the maximum value of the cubic Bezier curve 33 is: the coordinate of the starting point 331 (-91% multiplied by the base 31 (such as Figure 4 As shown), the length L / 2 of the Y axis is substantially equal to 0), the starting angle θ1 is tanβ equal to 8.80, the starting weight is equal to 0.50, the starting tangent length W1 is equal to 0.300 mm, the end point 332 coordinate (Z axis is substantially equal to 0, 33% multiplied by the base 31 (as shown) Figure 4 As shown), the end angle θ2 is tanα equal to -1.75, the end weight is equal to 0.46, and the end tangent length W2 is equal to 0.275 mm. Figure 20 The two inner area marks 20B in the elliptical light spot F (such as the mark 20A in the figure) have the highest intensity. The two inner area marks 20B correspond to the highest numerical part of the mark 20B above the energy chart on the right side of the figure. The light is diffused and the range of the light becomes larger.

[0114] See also Figures 21 to 23 , Figures 21 to 23 Schematic diagram of the shape, light distribution curve and light spot of the maximum value of the parameters of the cubic Bezier curve 33. In some embodiments, the minimum parameter values ​​of the cubic Bezier curve 33 are: the coordinates of the starting point 331 (-77% multiplied by the length L / 2 of the base 31, the Y axis is substantially equal to 0), the starting angle θ1 is tanβ equal to 8.80, the starting weight is equal to 0.44, the starting tangent length W1 is equal to 0.300 mm (mm), the coordinates of the end point 332 (the Z axis is substantially equal to 0, 17% multiplied by the height H of the base 31), the end angle θ2 is tanα equal to -1.75, the end weight is equal to 0.42, and the end tangent length W2 is equal to 0.275 mm (mm). Figure 23The intensity of the lower inner area marked 23B within the elliptical light spot F (marked 23A in the figure) is the highest. The inner area marked 23B corresponds to the highest numerical value part of the upper mark 23B on the energy chart on the right side of the figure. The light is diffused and the range of the light becomes larger.

[0115] See also Figures 1 to 5 In some embodiments, a light-emitting device 100 is provided, comprising a base 1, a light-emitting diode 2, and a package 3. The light-emitting diode 2 is located on one side of the base 1. The package 3 is located on one side of the base 1 and covers the light-emitting diode 2. The package 3 includes a base 31 and a lens portion 32. The lens portion 32 corresponds to the upper portion of the light-emitting diode 2. The lens portion 32 has a lens portion surface 321. The lens portion surface 321 conforms to a cubic Bezier curve 33. The cubic Bezier curve 33 has a starting point 331 and an end point 332. The starting point 331 is located on the base surface 311 of the base 31. The end point 332 corresponds to the upper portion of the light-emitting diode 2 (for example, but not limited to, the center of the light-emitting diode 2). The lens portion surface 321 has a concave portion 34 at the end point 332, which is curved from the outside to the inside and gradually narrows. The concave portion 34 can be a three-dimensional cone or a three-dimensional arc cone.

[0116] In some embodiments, a cross-section of the lens surface 321 reveals that the bottom of the recess 34 has a pointed protrusion 341, and the inner wall of the recess 34 is a curved portion 342. The three-dimensional appearance of the lens reveals the curved shape of the recess 34, unlike the flat-bottomed central recess of a typical Mini LED lens (not shown).

[0117] See also Figure 11 In some embodiments, a backlight module 200 is proposed, including a circuit board 5, a plurality of light-emitting devices 100, a diffuser 61 and a plurality of optical films 62 (polarizers and / or films with diffusion functions, etc.).

[0118] See also Figure 1 、 Figure 4 、 Figure 5 and Figure 11In some embodiments, each light-emitting device 100 is located on a circuit board 5. The light-emitting device 100 includes a base 1, an LED 2, and a package 3. The LED 2 is located on one side of the base 1. The package 3 is located on this side of the base 1 and covers the LED 2. The package 3 includes a base 31 and a lens portion 32. The lens portion 32 corresponds to the top of the LED 2. The lens portion 32 has a lens portion surface 321. The lens portion surface 321 conforms to a cubic Bezier curve 33. The cubic Bezier curve 33 has a starting point 331 and an end point 332. The starting point 331 is located on the base surface 311 of the base 31. The end point 332 corresponds to the top of the LED 2 (for example, but not limited to, the center of the LED 2). The lens portion surface 321 has a recessed portion 34 at the end point 332. The diffuser 61 is located above the circuit board 5 and is spaced apart from each other. Each optical die 62 is located on the diffuser 61.

[0119] In summary, according to some embodiments, a light-emitting device has a lens portion whose lens surface is constructed using a cubic Bezier curve. The lens portion is illuminated by a light-emitting diode and can expand the light-emitting angle. While maintaining the same area in the backlight module and ensuring the picture effect, the spacing between the light-emitting devices can be increased, thereby significantly reducing the number of light-emitting devices used and reducing the cost of the entire backlight module.

Claims

1. A light-emitting device, comprising: a base; a light emitting diode located on one side of the base; as well as A package body is located on the side of the base and covers the light-emitting diode. The package body includes a base and a lens portion. The lens portion corresponds to the top of the light-emitting diode. The lens portion has a lens portion surface. The lens portion surface conforms to a cubic Bezier curve. The cubic Bezier curve has a starting point and an end point. The starting point is located on a base surface of the base, and the end point corresponds to the top of the light-emitting diode. The lens portion surface has a concave portion at the end point. The cubic Bezier curve is a continuous curved surface from the starting point to the end point.

2. The light-emitting device of claim 1 , wherein the lens surface is a curved surface formed by rotating the cubic Bézier curve 360 ​​degrees about a central axis, the central axis being a plumb line passing through the end point, the plumb line being coaxial with a Z-axis, a vertical section of the base surface being coaxial with a Y-axis, the Z-axis intersecting and perpendicular to the Y-axis, the starting point being located at a coordinate position substantially equal to 0 on the Y-axis, and the end point being located at a coordinate position substantially equal to 0 on the Z-axis.

3. The light-emitting device of claim 2 , wherein the base has a height and a length, and the cubic Bezier curve parameter ranges are: the starting point coordinate ranges from (−77% multiplied by the length / 2, the Y-axis is substantially equal to 0) to (−91% multiplied by the length / 2, the Y-axis is substantially equal to 0), the starting point has a starting angle between the Y-axis and the tangent line of the cubic Bezier curve, the starting angle tanβ is equal to 8.80, the starting weight is between 0.44 and 0.50, and the starting tangent length is 0.300 millimeters (mm), the ending point coordinates range from (17% multiplied by the height, the Z-axis is substantially equal to 0) to (33% multiplied by the height, the Z-axis is substantially equal to 0), the ending point has an ending angle between the Z-axis and the tangent line of the cubic Bezier curve, the ending angle tanα is equal to −1.75, the ending weight is between 0.42 and 0.46, and the ending tangent length is 0.275 millimeters (mm). 4 . The light-emitting device according to claim 3 , wherein the package body is made of a packaging glue material, and the refractive index of the lens portion ranges from 1.45 to 1.

59. The light-emitting device according to claim 1 , wherein the package body is made of a packaging glue material, and the refractive index of the lens portion is 1.

52. 6 . The light emitting device as claimed in claim 1 , wherein the package body is made of epoxy resin, silica gel or silicone resin packaging glue. 7 . The light emitting device of claim 1 , wherein when a light distribution curve is calculated at 50% power, the light emitting angle of the lens portion is 166.30 degrees.

8. The light emitting device according to claim 1, wherein the area measured at a distance of 5 mm above the light emitting diode is 94.20 mm 2 The spot coverage range. 9 . The light emitting device as claimed in claim 3 , wherein a ratio of the height of the base to the length of the base is 1:

5. 10 . The light emitting device according to claim 3 , wherein a height of the base is 0.25 mm to 0.35 mm, and a length of the base is 0.8 mm to 1.8 mm. The light emitting device as claimed in claim 3 , wherein a size of the light emitting diode is 75 μm to 300 μm.

12. The light-emitting device of claim 1 , wherein the lens surface is a curved surface formed by rotating the cubic Bezier curve 360 ​​degrees about a central axis, the central axis being a plumb line passing through the end point, the plumb line being coaxial with a Z-axis, a vertical section of the base surface being coaxial with a Y-axis, the Z-axis intersecting and perpendicular to the Y-axis, the starting point being located at a coordinate position where the Y-axis is substantially equal to 0, and the end point being located at a coordinate position where the Z-axis is substantially equal to 0; the base having a height and a length, the cubic Bezier curve parameter range being: the starting point coordinate range being (−77% multiplied by the length / 2, where the Y-axis is substantially equal to 0) to (−91% multiplied by the length / 2, where the Y-axis is substantially equal to 0), the starting point having a starting point angle between the Y-axis and the tangent line to the cubic Bezier curve, the starting point angle being tanβ equal to 8 .80, the starting weight is 0.44 to 0.50, the starting tangent length is 0.300 mm, the end point coordinates are (17% multiplied by the height, the Z axis is substantially equal to 0) to (33% multiplied by the height, the Z axis is substantially equal to 0), the end point has an end point angle between the Z axis and the tangent line of the cubic Bezier curve, the end point angle is tanα equal to -1.75, the end point weight is 0.42 to 0.46, and the end point tangent length is 0.275 mm; the package is made of a packaging glue material, and the refractive index of the lens portion is 1.52; the package is made of a packaging glue material such as epoxy resin, silicone or silicone resin; at 50% power calculated by the light distribution curve, the luminous angle of the lens portion is 166.30 degrees; the area tested at a distance of 5 mm above the light emitting diode is 94.20 mm 2 The light spot coverage range is as follows; the height of the base is 0.25mm to 0.35mm, and the length of the base is 0.8mm to 1.8mm.

13. The light-emitting device as claimed in claim 1, wherein the surface of the lens portion has a concave portion at the end position that curves from the outside to the inside and gradually shrinks, the bottom of the concave portion has a pointed portion, and the side wall of the concave portion has a curved portion with a curved surface shape.

14. A backlight module, comprising: a circuit board; A plurality of light-emitting devices, each of which is located on the circuit board, the light-emitting devices comprising a base, a light-emitting diode, and a package. The light-emitting diode is located on one side of the base. The package is located on the side of the base and covers the light-emitting diode. The package comprises a base and a lens portion. The lens portion corresponds to the upper side of the light-emitting diode. The lens portion has a lens portion surface. The lens portion surface conforms to a cubic Bezier curve. The cubic Bezier curve has a starting point and an end point. The starting point is located on a base surface of the base. The end point corresponds to the upper side of the light-emitting diode. The lens portion surface has a concave portion at the end point. The cubic Bezier curve forms a continuous curved surface from the starting point to the end point. a diffusion sheet, the diffusion sheets being located above the circuit board and spaced apart from each other; as well as A plurality of optical dies are provided, each of the optical dies being located on the diffusion sheet.

15. The backlight module as claimed in claim 14, wherein an X-axis and a Y-axis are defined on the circuit board, intersecting, perpendicular and horizontal, and the light-emitting devices are arranged on the circuit board with a spacing of 16 mm in the X-axis and the Y-axis directions, and a total of 594 light-emitting devices are used.

16. The backlight module according to claim 14 , wherein the lens surface is a curved surface formed by rotating the cubic Bezier curve 360 ​​degrees about a central axis, the central axis being a plumb line passing through the end point, the plumb line being coaxial with a Z-axis, a vertical section of the base surface being coaxial with a Y-axis, the Z-axis intersecting and perpendicular to the Y-axis, the starting point being located at a coordinate position substantially equal to 0 on the Y-axis, and the end point being located at a coordinate position substantially equal to 0 on the Z-axis.

17. The backlight module of claim 16, wherein the base has a height and a length, and the cubic Bezier curve parameter ranges from (-77% multiplied by the length / 2, the Y-axis substantially equals 0) to (-91% multiplied by the length / 2, the Y-axis substantially equals 0), the starting point has a starting angle between the Y-axis and the tangent line of the cubic Bezier curve, the starting point angle tanβ is equal to 8.80, and the starting point weight is 0. 44 to 0.50, the starting point tangent length is 0.300 mm, the end point coordinates are (17% multiplied by the height, the Z axis is substantially equal to 0) to (33% multiplied by the height, the Z axis is substantially equal to 0), the end point has an end point angle between the Z axis and the tangent line to the cubic Bezier curve, the end point angle is tanα equal to -1.75, the end point weight is 0.42 to 0.46, and the end point tangent length is 0.275 mm.

18. The backlight module according to claim 17, wherein the encapsulation body is made of an encapsulating glue material, the refractive index of the lens portion is 1.52, the light distribution curve is calculated at 50% power, the light emitting angle of the lens portion is 166.30 degrees, and the area measured 5 mm above the light emitting diode is 94.20 mm. 2 The light spot coverage range is as follows; the height of the base is 0.25mm to 0.35mm, and the length of the base is 0.8mm to 1.8mm.

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