TW202033911A - Back-light source assembly and back-light module - Google Patents

Abstract

A back-light source assembly includes a substrate, a light-emitting device, a lens and at least one photo-absorption element. The light-emitting device is disposed on the substrate for emitting light thereon. The lens covers the light-emitting device. The lens includes a focal axis, an input surface and an output surface. The focal axis passes centers of the input surface and the output surface. The focal axis also passes the light-emitting device, and the input surface faces the light-emitting device for receiving light from the light-emitting device. At least the surface part of the photo-absorption element is composed of photo-absorption material. The photo-absorption element is arranged around the light-emitting device in a radial symmetry manner with respect to the focal axis, and the photo-absorption element is located within the projection of the lens on the substrate.

Description

Backlight source assembly and backlight module

The present invention relates to a direct-lit backlight design for a liquid crystal panel, and particularly relates to a backlight source assembly and a backlight module.

In the direct type backlight module used for the backlight of the liquid crystal panel, the light emitting diode (LED) is the point light source, and the reflective sheet is arranged to project light. The point light source will be further equipped with an optical lens to change the light path and convert the point light source into a uniform backlight. However, the setting of the lens often causes an aperture or dark lines on the outside of the lens or above the lens, resulting in uneven brightness.

The existing improvement method is to print black dots on the substrate under the lens or change the lens design to improve the aperture or dark lines. However, there is still room for improvement in the effect of printing black dots or changing the lens design.

In a direct-lit backlight module, an aperture or dark lines are formed outside or above the lens, which causes uneven brightness.

In view of the above problems, the present invention provides a backlight assembly that can effectively improve the aperture or dark lines.

At least one embodiment of the present invention provides a backlight assembly including a substrate, a light-emitting element, a lens, and at least one light-emitting element.

The light-emitting element is provided on the substrate to emit light on the substrate. The lens covers the light emitting element. The lens has a main axis, a light entrance side and a light exit side. The main axis passes through the center of the light entrance side and the light exit side. The main axis passes through the light emitting element and the light entrance side faces the substrate to receive the light emitted by the light emitting element. . The light-absorbing element is made of light-absorbing material at least on the surface, the light-absorbing element is based on the main axis, and the light-absorbing element is arranged symmetrically around the light-emitting element, and the light-absorbing element is located within the projection range of the lens on the substrate.

In at least one embodiment of the present invention, the light incident side has a recessed area, the main axis passes through the recessed area, and the projection of the light-emitting element on the substrate is within the projection range of the recessed area on the substrate.

In at least one embodiment of the present invention, the light-absorbing element is not located within the projection range of the recessed area on the substrate.

In at least one embodiment of the present invention, the lens has a plurality of supporting legs protruding from the light incident side and fixed to the substrate.

In at least one embodiment of the present invention, the light-absorbing element does not overlap the supporting leg.

In at least one embodiment of the present invention, the light-absorbing element is a coating mark coated with a light-absorbing paint on the substrate.

In at least one embodiment of the present invention, the light-absorbing element is a ring.

In at least one embodiment of the present invention, the ring is a solid ring or a dashed ring.

In at least one embodiment of the present invention, the width of the ring is greater than 0.05 mm and less than 0.5 mm, and the radius of the ring needs to be less than or equal to the lens radius.

In at least one embodiment of the present invention, the radius of the ring is not less than 0.5 times the radius of the lens.

In at least one embodiment of the present invention, the backlight assembly has a plurality of light-absorbing elements, and the radiation is symmetrically arranged and evenly distributed around the light-emitting elements.

In at least one embodiment of the present invention, each light-absorbing element is linear and extends outward along an extension direction centered on the main axis.

In at least one embodiment of the present invention, the lens has a lens radius relative to the main axis. In the extension direction, the length of each light-absorbing element is smaller than the lens radius and larger than 1 mm.

In at least one embodiment of the present invention, in the tangential direction perpendicular to the extending direction, the width of the light-absorbing element is greater than 1 mm and less than 0.15 times the circumferential length of the lens.

In at least one embodiment of the present invention, the surface of the substrate is coated with a material with high reflection coefficient.

In at least one embodiment of the present invention, each light absorbing element has a fan shape, an isosceles triangle, an arc shape or a crescent shape.

In at least one embodiment of the present invention, the light-absorbing material of the light-absorbing element is a photoluminescent material.

In at least one embodiment of the present invention, the backlight assembly further includes a back plate, the substrate is disposed on the back plate; and a reflection sheet is disposed on the substrate, and the reflection sheet has at least one opening to accommodate the light emitting element .

Another embodiment of the present invention provides a backlight module including a substrate, a plurality of light-emitting elements, a plurality of lenses, and a plurality of groups of light-absorbing elements.

A plurality of light-emitting elements are arranged on the substrate in an array type to emit light on the substrate. Each lens corresponds to one of the light-emitting elements and covers the corresponding light-emitting element; wherein, each lens has a main axis, a light entrance side, and a light exit side, the main axis passes through the center of the light entrance side and the light exit side, and the main axis passes The light emitting element has the light incident side facing the substrate to receive the light emitted by the light emitting element. At least the surface part of each light-absorbing element is made of light-absorbing material, each light-emitting element corresponds to a group of light-absorbing elements, and each group of light-absorbing elements is based on the main axis, and radiation symmetrically arranged around the corresponding light-emitting element, and the light-absorbing element is located at the corresponding The lens is within the projection range on the substrate.

In at least one embodiment of the present invention, between two adjacent sets of light-absorbing elements, the light-absorbing elements adopt a staggered configuration.

In at least one embodiment of the present invention, an imaginary line segment is defined between two adjacent light-emitting elements, and there is no more than one light-absorbing element on the imaginary line segment.

In at least one embodiment of the present invention, the backlight module further includes a back plate, the substrate is disposed on the reflective sheet; and a reflective sheet is disposed on the substrate, and the reflective sheet has a plurality of openings to accommodate each light-emitting element .

The invention is arranged symmetrically around the light-emitting element through the light-absorbing element and can improve the aperture or dark lines. At the same time, there are relatively few parameters that need to be considered for the radiation-symmetrical light-emitting elements, mainly the distance and length relative to the main axis, and the width relative to the tangential direction, which is more conducive to finding the optimal configuration of the light-absorbing element.

In the drawings, for clarity, the widths of some elements, regions, etc. are exaggerated. The same element symbols represent the same elements throughout the specification. It should be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements may also be present. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements.

It should be understood that although the terms "first", "second", "third", etc. can be used to describe various elements, components, regions or parts throughout the specification. However, these elements, components, regions, and/or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region or section from another element, component, region, layer or section. Therefore, the “first element,” “component,” “region,” or “portion” discussed below may be referred to as a second element, component, region, or portion without departing from the teachings herein.

In addition, relative terms such as "lower" or "bottom" and "upper" or "top" can be used herein to describe the relationship between one element and another element, as shown in the figure. It should be understood that relative terms are intended to include different orientations of the device other than those shown in the figures. For example, if the device in one drawing is turned over, the components described as being on the "lower" side of other components will be oriented on the "upper" side of other components. Therefore, the exemplary term "under" can include the orientations of "under" and "up", depending on the specific orientation of the schema.

As shown in FIGS. 1, 2 and 3, a backlight assembly 10 disclosed in the first embodiment of the present invention includes a substrate 110, a light-emitting element 120, a lens 130 and one or more light-absorbing elements 140.

Refer to Figure 1, Figure 2 and Figure 3. The part shown by the dotted line in FIG. 3 is the lens 130, which is expected to be disposed on the substrate 110 to cover the light-emitting element 120 and the light-absorbing element 140. As shown in the figure, the substrate 110 is used as a bearing foundation and provides necessary electrical connections. In a specific embodiment, the substrate 110 is a printed circuit board with a printed copper foil circuit to supply power to the light-emitting element 120. The power supply means is not limited to a printed copper foil circuit, and may also be other electrical connection methods, that is, the substrate 110 is not limited to a printed circuit board, and may be a general board body.

As shown in FIGS. 1, 2 and 3, the light-emitting element 120 can be, but is not limited to, a light-emitting diode chip (LED), which is used as a point light source. The light emitting element 120 is disposed on the substrate 110 to emit light on the substrate 110. The lens 130 is disposed on the substrate 110 and covers the light-emitting element 120.

As shown in FIG. 1, the lens 130 has a main axis X, a light entrance side 132 and a light exit side 134. The main axis X passes through the center of the light incident side 132 and the light output side 134, and the main axis X passes through the light emitting element 120. The light incident side 132 faces the substrate 110 and is used to receive the light emitted by the light-emitting element 120 and perform a refraction on the light. After the light is refracted twice by the light exit side 134, it leaves the lens 130, and the traveling direction converges toward the main axis X.

As shown in FIGS. 1, 2 and 3, there is a recessed area 136 on the light incident side 132, and the main axis X passes through the recessed area 136. The projection of the light emitting element 120 on the substrate 110 is located within the projection range of the recessed area 136 on the substrate 110. A concave primary curved surface is formed inside the recessed area 136 to perform a refraction. In addition, the lens 130 further has a plurality of supporting feet 138 that protrude from the light incident side 132 and are arranged in a radial symmetry manner based on the main axis X to be fixed to the substrate 10. Taking the lens 130 with three supporting legs 138 as an example, each supporting leg 138 is at the same distance from the main axis X, and an extension line can be defined between each supporting leg 138 and the main axis X. The included angle is equal (the included angle is 120 degrees).

As shown in FIGS. 1, 2 and 3, the light absorbing element 140 is made of light absorbing material at least on the surface, so that the surface of the light absorbing element 140 appears black or other darker colors. The light-absorbing element 140 is based on the main axis X, and is radially symmetrically arranged around the light-emitting element 120 to moderately absorb light to improve the aperture or dark lines on the edge or outside of the lens 130.

It should be noted that the thickness of the light-absorbing element 140 shown in FIG. 1 is only an example, and is not used to limit the ratio of the thickness. In a specific embodiment, the light-absorbing element 140 is a coating mark coated with a light-absorbing paint on the substrate 110, and its thickness is relatively small compared to the thickness of other elements. The so-called coating is not limited to using pens and brushes, but also includes screen printing, inkjet printing, transfer printing and other methods of making marks with paint. When the backlight assembly 10 has only one light-absorbing element 140, the so-called radiation-symmetrical arrangement means that the light-absorbing element 140 is a closed pattern formed by a solid line, such as a ring. When the backlight assembly 10 has a plurality of light-absorbing elements 140, the so-called radiation symmetrical arrangement can make the plurality of light-absorbing elements 140 evenly distributed around the light-emitting element 120. In addition, in order to prevent other parts of the substrate 110 from absorbing light, the surface of the substrate 110 has a higher reflection coefficient (higher than that of the light-absorbing element 140). For example, the surface of the substrate 110 is coated with a white or other light-colored high-reflectance material to make the substrate 110 The surface of 110 appears white.

As shown in FIG. 3, in principle, the light absorbing element 140 is located within the projection range of the lens 130 on the substrate 110, and is not located within the projection range of the recessed area 136 of the lens 130 on the substrate 110. In addition, the light absorbing element 140 does not overlap the supporting leg 138 of the lens 130. Taking FIG. 3 as an example, the backlight source assembly 10 has three light-absorbing elements 140 and the lens 130 has three supporting feet 138. Viewed from above the substrate 110, each light absorbing element 140 passes between the adjacent supporting legs 138 and does not overlap the supporting legs 138. At the same time, the light absorbing element 140 extends radially from the outside of the recessed area 136 to the edge of the lens 130, but does not exceed the edge of the lens 130.

3 and 4 as an example, the light-absorbing element 140 is linear, for example, a black straight line printed on the substrate 110 extends outward along an extension direction E with the main axis X as the center, and the projection of the lens 130 on the substrate 110 is roughly It is circular, so that the lens 130 has a lens radius R relative to the main axis X. In the extension direction E, the length L of the light absorbing element 140 is smaller than the lens radius R and larger than 1 mm. In the tangential direction perpendicular to the extension direction E, the width W of the light-absorbing element 140 is greater than 1 mm and less than 0.15 times the circumferential length of the lens 130.

As shown in FIGS. 5 to 8, the linear (black straight line) light absorbing element 140 is only an example, and the light absorbing element 140 may also be of other types. The light absorbing element 140 shown in FIG. 5 has a fan shape, the tip of the fan shape points to the main axis X, and the fan shape is radially symmetrically arranged around the light emitting element 120. The light absorbing element 140 shown in FIG. 6 is an isosceles triangle, the apex angle of the isosceles triangle points to the main axis X, and the isosceles triangle is radially symmetrically arranged around the light emitting element 120. The light-absorbing element 140 shown in FIGS. 7 and 8 has an arc shape or a crescent moon shape, the extension line of the equivalent radius passes through the main axis X, and the arc or crescent moon shape is radially symmetrically arranged around the light emitting element 120.

In principle, the shape of the light-absorbing element 140 is not limited. It is only necessary that the shape of the light-absorbing element 140 is the same, and radiation is symmetrically arranged around the light-emitting element 120, so that the light-absorbing element 140 evenly surrounds the light-emitting element 120. In this way, the light absorption effect of the plurality of light absorption elements 140 will be more uniform, and the light absorption effect will not have a specific directionality.

As shown in Figures 9 and 10, if the number of arcs in Figure 7 is increased and the arc length is reduced, a dotted loop will be formed. This dashed circle can be regarded as a single light absorbing element 140 or a collection of multiple light absorbing elements 140. If the arc shape in FIG. 7 is further extended to be connected to each other, a solid line loop will be formed as a single light absorbing element 140. In principle, the ring shown in FIGS. 9 and 10 does not overlap the supporting leg 138 of the lens 130, and the center of the ring is located on the main axis X. The width of the ring is greater than 0.05 mm and less than 0.5 mm, and the radius of the ring must be less than or equal to the lens radius R (the light emitting element 120 is projected on the substrate 110 and is located within the projection range of the lens 130 on the substrate 110), not less than the lens The radius R is 0.5 times to ensure that the ring as the light-absorbing element 140 can effectively absorb light.

Generally speaking, the greater the width of the ring, the smaller the radius of the ring. Taking the solid-line ring in FIG. 10, when the ring width is 0.35 mm, the ring radius is equal to 0.625 times the lens radius R to have a better uniform light effect. When the ring width is reduced to 0.15mm, the ring radius needs to be increased to 0.75 times the lens radius R. However, when the solid line ring is replaced with a dashed line ring, the radius of the ring needs to be increased. For example, for a dashed line ring with a ring width of 0.2 mm, the ring radius needs to be increased to 0.8 times the lens radius R.

The light-absorbing material of the light-absorbing element 140 is not necessarily black that absorbs light in the entire spectrum, but may also be other colors that absorb light in a specific spectrum range. For example, due to the difference in refractive index, a yellow ring caused by uneven color of the light source may appear around the light-emitting component. At this time, the light-absorbing material of the light-absorbing element 140 can be changed to blue. For example, changing the black straight line, black dotted line ring or black solid line ring to blue straight line, blue dotted line ring or blue solid line ring can suppress blue light. It can improve the yellow ring caused by uneven color of the light source.

In addition, the light-absorbing material of the light-absorbing element 140 does not necessarily simply absorb light, but can also be a material that is excited to emit light in other spectrums after absorbing light. For example, in a specific embodiment, the light-absorbing material of the light-absorbing element 140 is a photoluminescent material, such as quantum dot material, phosphor material, or fluorescent material, which can be excited by blue light Produce white light. At this time, as long as the light emitting element 120 selects a blue light source that can emit monochromatic light (blue light), the halo of uneven color brightness can be improved.

Referring again to FIG. 1, the backlight source assembly 10 further includes a back plate 150 and a reflective sheet 160. The back plate 150 is used as a part of a display device, and the substrate 110 is disposed thereon, so that the backlight assembly 10 is combined with the substrate 110 to form a backlight module 100. The backlight module 100 further combines a display medium (such as a liquid crystal panel), a driving circuit, and a front frame to form a display device. The reflective sheet 160 is disposed on the substrate 110, and the reflective sheet 160 has at least one opening 162 to accommodate the light-emitting element 120. In the first embodiment, the radius of the opening 162 is greater than the radius R of the lens. Therefore, the supporting leg 138 of the lens 130 is fixed on the substrate 110, and the light absorbing element 140 is also disposed on the substrate 110. In this case, at least the part of the surface of the substrate 110 corresponding to the opening 162 must be coated with white paint or reflective material to maintain a uniform reflection effect on the reflective sheet 160.

Referring to FIG. 11 again, it is a light-emitting source assembly disclosed in the second embodiment. The radius of the opening 162 is smaller than the radius of the lens 130 and can only roughly accommodate the light-emitting element 120. At this time, the supporting leg 138 of the lens 130 is fixed to the reflective sheet 160 or the substrate 10, and the light-absorbing element 140 is also disposed on the reflective sheet 160. In this embodiment, the reflective sheet 160 can be regarded as a part of the substrate 10, that is, the substrate 10 includes a base layer and a reflective layer, and the reflective layer is provided with an opening 162 to expose a part of the base layer.

Referring to FIG. 12, a backlight module 100 disclosed in the third embodiment of the present invention includes a substrate 110, a plurality of light-emitting elements 120, a plurality of lenses 130, and a plurality of groups of light-absorbing elements 140. The technical details of the substrate 110, the plurality of light-emitting elements 120, the plurality of lenses 130, and the plurality of light-absorbing elements 140 are substantially the same as those of the foregoing embodiment, and will not be described in detail below.

As shown in FIG. 12, a plurality of light-emitting elements 120 are arranged on the substrate 110 in an array, especially a two-dimensional rectangular array. Each lens 130 corresponds to a light-emitting element 120 and covers the corresponding light-emitting element 120.

As shown in FIG. 12, each light-emitting element 120 corresponds to a group of light-absorbing elements 140, each group of light-absorbing elements 140 has the same number, and the light-emitting elements 120 have the same type. Each light-emitting element 120 is made of light-absorbing material at least on the surface, so that the surface of the light-absorbing element 140 appears black or other darker colors. The light-absorbing element 140 is based on the main axis X, and is radially symmetrically arranged around the light-emitting element 120. In order to simplify the drawing, the lens 130 in FIG. 12 has been simplified. For details of the lens 130, please refer to the first or second embodiment.

As shown in Figures 12, 13 and 14, in order to avoid the concentrated addition of the light absorbing effect of the light absorbing element 140, the light absorbing element 140 adopts a staggered configuration between the two adjacent sets of light absorbing elements 140 to avoid the two light absorbing elements 140 directly Adjacent, and a light-absorbing area is formed between the two light-emitting elements 120. In other words, an imaginary line segment B is defined between two adjacent light-emitting elements 120, and there is no more than one light-absorbing element 140 on the imaginary line segment B. As shown in FIG. 13, no light-emitting element 120 is provided on the imaginary line segment B. As shown in FIG. 14, there is only one light-emitting element 120 on the imaginary line segment B. This imaginary line segment B may be connected to two adjacent light emitting elements 120 in the horizontal direction, or may be connected to two adjacent light emitting elements 120 in the longitudinal direction. In this way, it is possible to avoid the formation of a concentrated light absorption effect around the midpoint of the imaginary line segment B, such as the area where the dotted line C passes.

Referring to FIG. 1 and FIG. 12, the backlight source assembly 10 of FIG. 1, FIG. 2 and FIG. 3 is expanded into an array to become the backlight module 100 of FIG. 12. That is, the backlight module 100 further includes a back plate 150 and a reflective sheet 160. The back plate 150 is used as a part of a display device, and the substrate 110 is disposed thereon, so that the backlight assembly 10 is combined with the substrate 110 to form a backlight module 100. The backlight module 100 further combines a display medium (such as a liquid crystal panel), a driving circuit, and a front frame to form a display device. As shown in the foregoing embodiment, the reflective sheet 160 is disposed on the substrate 110, and the reflective sheet 160 has a plurality of openings 162 to accommodate the light emitting element 120. The radius of the opening 162 may be larger or smaller than the radius R of the lens. According to the size relationship between the opening 162 and the lens radius R, it can be determined that the supporting leg 138 and the light absorbing element 140 are disposed on the substrate 110 or disposed on the reflective sheet 160. For related technical means, please refer to the first and second embodiments. Repeat it again.

The present invention is arranged symmetrically around the light-emitting element 140 through the light-absorbing element and can absorb light appropriately to improve the aperture or dark lines. At the same time, there are relatively few parameters that need to be considered for light-emitting elements arranged in radiation symmetry, mainly the distance and length relative to the main axis, and the width relative to the tangential direction, which is more conducive to finding the optimal configuration of the light-absorbing element 140.

10: Backlight component 100: Backlight module 110: substrate 120: light-emitting element 130: Lens 132: Light incident side 134: Light emitting side 136: Depressed area 138: Support foot 140: Light-absorbing element 150: back plate 160: reflective sheet 162: Opening B: Imaginary line segment L: length R: lens radius C: dotted line E: extension direction W: width X: main axis

FIG. 1 is a cross-sectional view of the backlight assembly in the first embodiment of the present invention. 2 is a top view of the backlight assembly in the first embodiment of the invention. Fig. 3 is a top view of partial components in the first embodiment of the present invention. 4 is a top view of the light-emitting element, the light-absorbing element and the lens in the first embodiment of the present invention, revealing the relative size relationship. 5 to 8 are top views of the light-emitting element, the light-absorbing element and the lens in the first embodiment of the present invention, revealing different types of light-absorbing elements. 9 and 10 are top views of the light-emitting element, the light-absorbing element and the lens in the first embodiment of the present invention, revealing light-absorbing elements of different ring types. FIG. 11 is a cross-sectional view of the backlight assembly in the second embodiment of the present invention. FIG. 12 is a top view of the backlight module in the third embodiment of the present invention. 13 and 14 are top views of the light-emitting element, the light-absorbing element and the lens in the third embodiment of the present invention, revealing the arrangement of the light-absorbing element between adjacent light-emitting elements.

10: Backlight component

110: substrate

120: light-emitting element

130: lens

136: Depressed Area

138: Support feet

140: light-absorbing element

160: reflective sheet

162: Opening

Claims (21)

A backlight assembly, including: A substrate; A light emitting element arranged on the substrate to emit light on the substrate; A lens covering the light-emitting element, the lens having a main axis, a light-incident side and a light-exit side, the main axis passes through the center of the light-incident side and the light-exit side, and the main axis passes through the light-emitting element, the light-incident side Face the substrate to receive the light emitted by the light-emitting element; and At least one light-absorbing element is made of light-absorbing material at least on the surface. The light-absorbing element is arranged symmetrically around the light-emitting element based on the main axis, and the light-absorbing element is located within the projection range of the lens on the substrate. The backlight assembly of claim 1, wherein the light incident side has a recessed area, the main axis passes through the recessed area, and the projection of the light-emitting element on the substrate is the projection of the recessed area on the substrate Within range. The backlight assembly according to claim 1, wherein the light-absorbing element is not located in the projection range of the recessed area on the substrate. The backlight assembly according to claim 1, wherein the lens has a plurality of supporting legs, which protrude from the light incident side and are fixed to the substrate. The backlight assembly of claim 4, wherein the light-absorbing element does not overlap the supporting legs. The backlight assembly according to claim 1, wherein the light-absorbing element is a coating mark coated with a light-absorbing paint on the substrate. The backlight assembly according to claim 6, wherein the light-absorbing element is a ring. The backlight assembly according to claim 7, wherein the ring is a solid ring or a dashed ring. The backlight assembly of claim 8, wherein the width of the ring is greater than 0.05 mm and less than 0.5 mm, and the radius of the ring is less than or equal to a lens radius. The backlight assembly according to claim 9, wherein the radius of the ring is not less than 0.5 times the radius of the lens. The backlight assembly according to claim 6, wherein the backlight assembly has a plurality of light-absorbing elements, and the radiation is symmetrically arranged and evenly distributed around the light-emitting element. The backlight assembly of claim 11, wherein each of the light-absorbing elements is linear and extends outward along an extension direction with the main axis as the center. The backlight assembly of claim 12, wherein the lens has a lens radius relative to the main axis, and in the extending direction, the length of each light absorbing element is smaller than the lens radius and larger than 1 mm. The backlight assembly of claim 12, wherein, in a tangential direction perpendicular to the extending direction, the width of the light-absorbing element is greater than 1 mm and less than 0.15 times the circumferential length of the lens. The backlight assembly according to claim 10, wherein each of the light-absorbing elements has a fan shape, an isosceles triangle shape, an arc shape or a crescent shape. The backlight assembly according to claim 1, wherein the light-absorbing material of the light-absorbing element is a photoluminescent material. The backlight assembly as described in claim 1, further comprising: A backplane on which the substrate is arranged; and A reflective sheet is arranged on the substrate, and the reflective sheet has at least one opening to accommodate the light-emitting element. A backlight module, including: A substrate; A plurality of light-emitting elements are arranged on the substrate in an array type to emit light on the substrate; A plurality of lenses, each lens corresponding to one of the light-emitting elements and covering the corresponding light-emitting element; wherein each lens has a main axis, a light-incident side, and a light-exit side, and the main axis passes through the The center of the light-incident side and the light-exit side, the main axis passes through the light-emitting element, and the light-incident side faces the substrate to receive the light emitted by the light-emitting element; and A plurality of groups of light-absorbing elements, each of the light-absorbing elements is made of light-absorbing material at least on the surface part, each of the light-emitting elements corresponds to a group of the light-absorbing elements, and each group of light-absorbing elements is based on the main axis, and the radiation is symmetrically arranged in the corresponding Around the light-emitting element, and the light-absorbing elements are located within the projection range of the corresponding lens on the substrate. The backlight module according to claim 18, wherein, between two adjacent groups of the light-absorbing elements, the light-absorbing elements are arranged in a staggered configuration. The backlight module according to claim 19, wherein an imaginary line segment is defined between two adjacent light-emitting elements, and there is no more than one light-absorbing element on the imaginary line segment. The backlight module according to claim 18 further includes: A back plate, the substrate is arranged on the reflective sheet; and A reflective sheet is arranged on the substrate, and the reflective sheet has a plurality of openings to accommodate each of the light-emitting elements.

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