TWI786531B - Light source module and display device - Google Patents

Abstract

A light source module includes a substrate, a plurality of first rectangular light-emitting elements and a plurality of second rectangular light-emitting elements. The substrate has a side surface and a carrying surface connected to the carrying surface. The plurality of first rectangular light-emitting elements and the plurality of second rectangular light-emitting elements are disposed on the carrying surface and are arranged in an array. Each of the first rectangular light-emitting elements has a first light-emitting side surface, and each of the second rectangular light emitting elements has a second light emitting side surface. The second light emitting side surface is relatively inclined to the side surface of the substrate. A display device using the light source module of the invention is further provided.

Description

Light source module and display device

The present invention relates to a light source module, and in particular to a light source module that can be used in a display device and a display device using the light source module.

The liquid crystal display device includes a liquid crystal display panel and a backlight module. Since the liquid crystal display panel itself does not emit light, it is necessary to rely on the backlight module to provide display light to the liquid crystal display panel. Therefore, the main function of the backlight module is to provide a display light source with high luminance and high uniformity.

Traditionally, backlight modules can be divided into side-type backlight modules and direct-type backlight modules. Generally speaking, the light source energy of the light-emitting diode (LED) used in the direct-lit backlight module is relatively concentrated, so on the display screen, there will be bright spots in the area directly above the light-emitting diode, causing the overall screen to appear. The phenomenon of uneven brightness and darkness.

The currently known solution is to make the arrangement of light-emitting diodes more dense, that is, to increase the number of light-emitting diodes, so that the bright spots can be further superimposed together, neutralize the respective intensity of the bright spots, and reduce the unevenness of brightness and darkness. Phenomenon. However, when the number of light-emitting diodes increases, the cost of manufacturing the backlight module is also higher, which cannot be widely used in products.

This "Prior Art" section is only used to help understand the content of the present invention, so the content disclosed in the "Prior Art" may contain some prior art that does not constitute the prior art known to those with ordinary skill in the art. In addition, the content disclosed in the "prior art" does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it represent that it has been known by those with ordinary knowledge in the technical field before the application of the present invention know or know.

The invention provides a light source module, which can improve brightness uniformity and reduce production cost.

The invention provides a display device, which can improve brightness uniformity and reduce production cost.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

To achieve one or part or all of the above objectives or other objectives, a light source module provided by an embodiment of the present invention includes a substrate, a plurality of first rectangular light-emitting elements and a plurality of second rectangular light-emitting elements. The substrate has a side surface and a bearing surface, and the side surface is connected to the bearing surface. A plurality of first rectangular light-emitting elements are arranged on the carrying surface, and each first rectangular light-emitting element has a first light-emitting side surface respectively. A plurality of second rectangular light-emitting elements are arranged on the bearing surface. The first rectangular light emitting elements and the second rectangular light emitting elements are arranged in an array. Each second rectangular light-emitting element has a second light-emitting side, and the second light-emitting side is relatively inclined to the side of the substrate.

In an embodiment of the present invention, the orthographic projection shape of the above-mentioned second rectangular light-emitting elements on the carrying surface is a square.

In an embodiment of the present invention, the angle at which the second light-emitting side of each of the above-mentioned second rectangular light-emitting elements is inclined relative to the side is 45°.

In an embodiment of the present invention, the above-mentioned light source module further includes a reflective element disposed on the carrying surface, and has a plurality of reflective grooves and a plurality of openings, and each opening is respectively arranged at the bottom of each reflective groove A plurality of first rectangular light-emitting elements and a plurality of second rectangular light-emitting elements respectively penetrate through the openings.

In an embodiment of the present invention, each of the above-mentioned reflective grooves has four connected reflective sides, and each second rectangular light-emitting element has an angle corresponding to one of the four reflective sides.

In an embodiment of the present invention, the above-mentioned reflective element is integrally formed.

In an embodiment of the present invention, the corners of each second rectangular light-emitting element are aligned with the corners of another second rectangular light-emitting element along an alignment direction, and the alignment direction is parallel to or perpendicular to the side surface of the substrate.

In an embodiment of the present invention, the above-mentioned first rectangular light-emitting elements and the second rectangular light-emitting elements are arranged in a staggered array on the carrying surface, and the first light-emitting side of each first rectangular light-emitting element is parallel or vertical on the side of the substrate.

In an embodiment of the present invention, the first light-emitting side of each of the above-mentioned first rectangular light-emitting elements is relatively inclined to the side of the substrate.

To achieve one or part or all of the above objectives or other objectives, a display device provided by an embodiment of the present invention includes a display panel and the above-mentioned light source module, and the display panel is disposed on the light emitting side of the light source module.

In the light source module of the embodiment of the present invention, each second rectangular light-emitting element has a second light-emitting side, and the second light-emitting side is relatively inclined to the side of the substrate, which means that these second rectangular light-emitting elements arranged on the substrate are rotated , because the optical path of the light-emitting element in the diagonal direction is long, it is easy to form a dark area, and these second rectangular light-emitting elements will make the second light-emitting side face the dark area in the diagonal direction after rotation, increasing the brightness of the dark area , so the brightness uniformity of the light source module can be further improved. Compared with the conventional solutions, there is no need to increase the number of light-emitting elements, so the production cost can be reduced. Since the display device of the embodiment of the present invention uses the above-mentioned light source module, it can also improve the brightness uniformity and reduce the production cost.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the attached drawings.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

FIG. 1 is a schematic top view of a light source module according to an embodiment of the present invention. Please refer to FIG. 1 , the light source module 10 of this embodiment includes a substrate 100 , a plurality of first rectangular light emitting elements 200 and a plurality of second rectangular light emitting elements 300 . The substrate 100 has a side surface 110 and a carrying surface 120 , and the side surface 110 is connected to the carrying surface 120 . A plurality of first rectangular light emitting elements 200 and a plurality of second rectangular light emitting elements 300 are disposed on the carrying surface 120 , and the first rectangular light emitting elements 200 and the second rectangular light emitting elements 300 are arranged in an array, for example. In this embodiment, each first rectangular light-emitting element 200 has a first light-emitting side 210 , for example, the first light-emitting side 210 is parallel to or perpendicular to the side 110 of the substrate 100 , but not limited thereto. Each second rectangular light-emitting element 300 has a second light-emitting side 310 respectively, and the second light-emitting side 310 is relatively inclined to the side 110 of the substrate 100 .

The difference between the first rectangular light emitting element 200 and the second rectangular light emitting element 300 is that the second light emitting side 310 of the second rectangular light emitting element 300 is relatively inclined to the side 110 of the substrate 100 . Therefore, in FIG. 1 , specifically, the first rectangular light emitting elements 200 and the second rectangular light emitting elements 300 are arranged on the carrying surface 120 in a staggered array, for example, but not limited thereto. It should be noted that the second light-emitting side 310 referred to in this specification generally refers to any side of the second rectangular light-emitting element 300 that can emit light, that is, the second rectangular light-emitting element 300 should actually have four second light-emitting sides 310 , and these side surfaces are, for example, relatively inclined to the side surface 110 of the substrate 100 . For the convenience of description, the following "second light-emitting side 310" all represent one of the sides. The above description is also applicable to the first light-emitting side 210 of the first rectangular light-emitting element 200 , and will not be repeated here.

In this embodiment, the first rectangular light emitting element 200 and the second rectangular light emitting element 300 are, for example, square light emitting elements (as shown in FIG. 1 ), but not limited thereto. Specifically, the square means that the shape of the orthographic projection of the first rectangular light-emitting element 200 and the second rectangular light-emitting element 300 on the carrying surface 120 is a square. In addition, the angle θ1 at which the second light-emitting side 310 of each second rectangular light-emitting element 300 is inclined relative to the side 110 is, for example, 45°, but not limited thereto. In other words, the corner A formed by connecting any two adjacent second light-emitting side surfaces 310 of each second rectangular light-emitting element 300 will be aligned with the corner A of another second rectangular light-emitting element 300 along the alignment direction D, and aligned The direction D is, for example, parallel to or perpendicular to the side surface 110 of the substrate 100 . The corner A referred to here is the turning point of the side structure of the second rectangular light-emitting element 300 , taking a rectangle as an example, the side structure should have 4 turning places, that is, 4 corners A. However, the present invention does not particularly limit the angle θ1 at which the second light-emitting side 310 of the second rectangular light-emitting element 300 is inclined relative to the side 110 . In other embodiments, when the second rectangular light-emitting element 300 is, for example, a rectangular light-emitting element (the shape of the orthographic projection on the bearing surface 120 is a rectangle), the angle θ1 can be adjusted according to design requirements, or multiple second rectangular light-emitting elements The angle θ1 at which the second light-emitting side 310 is inclined relative to the side 110 between 300 may be different.

The substrate 100 is, for example, a printed circuit board, which can be a hard board or a flexible board, and is used to carry a plurality of first rectangular light-emitting elements 200 and a plurality of second rectangular light-emitting elements 300, and drive the plurality of first rectangular light-emitting elements through the substrate 100 200 and a plurality of second rectangular light emitting elements 300 emit light. In this embodiment, the shape of the substrate 100 is, for example, also a rectangle, but it is not limited thereto.

The first rectangular light emitting element 200 and the second rectangular light emitting element 300 may be light emitting diodes, but may also be other types of light emitting elements. In addition, the first rectangular light-emitting element 200 and the second rectangular light-emitting element 300 may also be unpackaged light-emitting chips cut directly from a wafer, such as light-emitting diode chips. For example, the light-emitting diode chip is, for example, a grain-level nitride light-emitting diode chip that emits blue light at a dominant wavelength, but it is not limited thereto. The numbers of the first rectangular light-emitting elements 200 and the second rectangular light-emitting elements 300 in FIG. 1 are 8 as an example, but not limited thereto. It should be noted that FIG. 1 intends to present the arrangement of multiple first rectangular light-emitting elements 200 and multiple second rectangular light-emitting elements 300. The numbers are for illustration only, and the present invention is not particularly limited.

According to different design requirements, for example, the light source module 10 of this embodiment further includes at least one optical film (not shown in the figure), which is disposed on the side of the substrate 100 having the carrying surface 120 . The at least one optical film is, for example, a polarized brightness enhancement film, a diffuser film, a film or a composite film, but not limited thereto.

In the light source module 10 of the present embodiment, each second rectangular light-emitting element 300 has a second light-emitting side 310, and the second light-emitting side 310 is relatively inclined to the side 110 of the substrate 100, which means that those disposed on the substrate 100 The second rectangular light emitting elements 300 are rotated. Since the optical path of the light emitting elements in the diagonal direction is longer, it is easy to form a dark area. After these second rectangular light emitting elements 300 are rotated, the second light emitting side 310 can face the diagonal direction. The dark area increases the brightness of the dark area, so the brightness uniformity of the light source module 10 can be further improved. Compared with the conventional solutions, there is no need to increase the number of light-emitting elements, so the production cost can be reduced.

FIG. 2A is a schematic top view of a light source module according to another embodiment of the present invention. FIG. 2B is a schematic cross-sectional view of a reflective element disposed on a substrate. Please refer to FIG. 2A and FIG. 2B , the structure and advantages of the light source module 10 a of this embodiment are similar to the above-mentioned light source module 10 , and only the main differences in structure will be described below. The light source module 10 a of this embodiment further includes a reflective element 400 disposed on the carrying surface 120 (as shown in FIG. 2B ), and has a plurality of reflective grooves 410 and a plurality of openings 420 . The reflection groove 410 is a groove formed by the reflection element 400 protruding upward from the bearing surface 120 . Each opening 420 is respectively disposed at the bottom of each reflection groove 410 , and a plurality of first rectangular light-emitting elements 200 and a plurality of second rectangular light-emitting elements 300 are correspondingly disposed through the openings 420 . The reflective element 400 in this embodiment is, for example, integrally formed, but not limited thereto. In another embodiment, the reflective element 400 may also be spliced by several reflective elements.

Each reflective groove 410 has four connected reflective sides 411 respectively. These reflective sides 411 are relatively inclined to the bearing surface 120, and the maximum width W1 of the opening of the reflective groove 410 is greater than the maximum width W2 of the bottom of the reflective groove 410, so It is suitable for guiding the light emitted by the first rectangular light-emitting element 200 and the second rectangular light-emitting element 300 after being reflected by the reflective side 411 . In this embodiment, the corner A of each second rectangular light-emitting element 300 is, for example, corresponding to one of the four reflective sides 411 , as shown in FIG. 2A . Since the reflecting groove 410 is connected to any two reflecting sides 411, the reflection function of the angled area formed by the connection is weaker than that of the reflecting side 411. Compared with the first light emitting side 210 of the first rectangular light emitting element 200, it will The emitted light L1 is directed toward the reflective side 411, and the second light emitting side 310 of the second rectangular light emitting element 300 is an angled area corresponding to the reflective groove 410, so that the light L2 emitted by the second light emitting side 310 can be directly emitted to the included angle area , to make up for the weak reflection function in the angle area, so that the uniformity of the overall light output can be more consistent, and the effect of improving the uniformity of brightness can be achieved.

FIG. 3 is a schematic top view of a light source module according to another embodiment of the present invention. Please refer to FIG. 3 , the light source module 10b of this embodiment is similar to the structure and advantages of the above-mentioned light source module 10, the only difference is that in the light source module 10b of this embodiment, the first light emission of each first rectangular light-emitting element 200 The side surface 210 is also, for example, relatively inclined to the side surface 110 of the substrate 100 . In addition, the angle θ1 of the second light-emitting side 310 relative to the side 110 is, for example, the same as the angle θ2 of the first light-emitting side 210 relative to the side 110 , but not limited thereto. The light source module 10b may also include the reflective element 400 in the light source module 10a described above, and the present invention does not particularly limit the combination and application of the elements in the various embodiments. Since the light source module 10b of this embodiment rotates the first rectangular light-emitting elements 200 arranged on the substrate, the brightness uniformity can be further improved.

FIG. 4 is a schematic cross-sectional view of a display device according to an embodiment of the present invention. Please refer to FIG. 4 , the display device 1 of this embodiment includes the above-mentioned light source module 10 and the display panel 20 . The display panel 20 is disposed on the light emitting side of the light source module 10 . The display panel 20 can be a liquid crystal display panel or other non-self-luminous display panels. The light source module 10 is used to provide a surface light source L3 to the display panel 20 as a display light source. The light source module 10 can be replaced with the light source module of any of the above-mentioned embodiments. Because the light source module 10 of the display device 1 of this embodiment can improve the brightness uniformity and reduce the production cost, the display device 1 using the light source module 10 can also improve the brightness uniformity and reduce the production cost. Advantages of cost.

To sum up, in the light source module of the embodiment of the present invention, each second rectangular light-emitting element has a second light-emitting side, and the second light-emitting side is relatively inclined to the side of the substrate, which means that these first light-emitting elements arranged on the substrate The two rectangular light-emitting elements are rotated. Since the optical path of the light-emitting elements in the diagonal direction is longer, it is easy to form a dark region. After these second rectangular light-emitting elements are rotated, the second light-emitting side can face the dark region in the diagonal direction. Increase the brightness of the dark area, so the brightness uniformity of the light source module can be further improved. Compared with the conventional solutions, there is no need to increase the number of light-emitting elements, so the production cost can be reduced. Since the display device of the embodiment of the present invention uses the above-mentioned light source module, it can also improve the brightness uniformity and reduce the production cost.

But what is described above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention, All still belong to the scope covered by the patent of the present invention. In addition, any embodiment or scope of claims of the present invention does not necessarily achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present invention. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name elements (elements) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

1: Display device 10, 10a, 10b: light source module 20: Display panel 100: Substrate 110: side 120: bearing surface 200: the first rectangular light-emitting element 210: The first luminous side 300: the second rectangular light-emitting element 310: second luminous side 400: reflective element 410: reflective tank 411: reflective side 420: opening A: Second corner D: alignment direction L1, L2: light L3: surface light source W1, W2: Width θ1, θ2: Angle.

FIG. 1 is a schematic top view of a light source module according to an embodiment of the present invention. FIG. 2A is a schematic top view of a light source module according to another embodiment of the present invention. FIG. 2B is a schematic cross-sectional view of a reflective element disposed on a substrate. FIG. 3 is a schematic top view of a light source module according to another embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

10: Light source module

100: Substrate

110: side

120: bearing surface

200: the first rectangular light-emitting element

210: The first luminous side

300: the second rectangular light-emitting element

310: second luminous side

A: Corner

D: alignment direction

θ1: Angle.

Claims (6)

A light source module, comprising: a substrate having a side surface and a bearing surface, the side surface is connected to the bearing surface; a plurality of first rectangular light-emitting elements are arranged on the bearing surface, and each of the first rectangular light-emitting elements Each has a first light-emitting side, wherein the first light-emitting side of each of the first rectangular light-emitting elements is relatively inclined to the side of the substrate; a plurality of second rectangular light-emitting elements are arranged on the carrying surface, and the The first rectangular light-emitting element and the second rectangular light-emitting elements are arranged in an array, wherein each of the second rectangular light-emitting elements has a second light-emitting side, and the second light-emitting side is relatively inclined to the side of the substrate; and A reflective element is arranged on the carrying surface, and has a plurality of reflective grooves and a plurality of openings, and each of the openings is respectively arranged at a bottom of each of the reflective grooves, the first rectangular light-emitting elements and the The second rectangular light-emitting elements are correspondingly installed in the openings, wherein each of the reflective grooves has four connected reflective sides, and each of the second rectangular light-emitting elements has a corner. The folding angle corresponds to one of the four reflective sides, wherein in the direction parallel to the side, the first rectangular light-emitting elements and the second rectangular light-emitting elements are arranged alternately, and in the direction parallel to the side The angle of the first light-emitting side that is adjacent to the side that is inclined to the substrate is the same as the angle that the second light-emitting side is inclined to the side of the substrate. In the direction perpendicular to the side, the The first rectangular light-emitting elements and the second rectangular light-emitting elements are arranged alternately, and the angle of the adjacent first light-emitting side faces in the direction perpendicular to the side surface relative to the side face of the substrate is the same as that of the second light-emitting elements. The side is inclined relative to the angle of the side of the substrate. The light source module according to claim 1, wherein the orthographic projection shape of the second rectangular light-emitting elements on the carrying surface is a square. The light source module according to claim 2, wherein the angle at which the second light-emitting side of each of the second rectangular light-emitting elements is inclined relative to the side is 45°. The light source module according to claim 1, wherein the reflective element is integrally formed. The light source module according to claim 1, wherein a corner of each of the second rectangular light-emitting elements is aligned with the corner of another second rectangular light-emitting element along an alignment direction, and the alignment direction is parallel to or perpendicular to on the side of the substrate. A display device, comprising: a light source module, comprising: a substrate having a side surface and a bearing surface, the side surface being connected to the bearing surface; a plurality of first rectangular light-emitting elements arranged on the bearing surface, each of the Each of the first rectangular light-emitting elements has a first light-emitting side, wherein the first light-emitting side of each of the first rectangular light-emitting elements is relatively inclined to the side of the substrate; a plurality of second rectangular light-emitting elements are arranged on the On the carrying surface, the first rectangular light-emitting elements and the second rectangular light-emitting elements are arranged in an array, wherein each of the second rectangular light-emitting elements has a second light-emitting side, and the second light-emitting side is relatively inclined to the The side surface of the substrate; and a reflective element, which is arranged on the carrying surface and has a plurality of reflective grooves and a plurality of openings, each of which is respectively arranged at a bottom of each of the reflective grooves, and the The first rectangular light-emitting elements and the second rectangular light-emitting elements are correspondingly installed in the openings, and each of the reflective grooves There are four connected reflective sides respectively, and each of the second rectangular light-emitting elements further has a corner corresponding to one of the four reflective sides; and a display panel configured on the light source module A light-emitting side of the side, wherein in the direction parallel to the side, the first rectangular light-emitting elements and the second rectangular light-emitting elements are arranged alternately, and the first adjacent light-emitting elements in the direction parallel to the side The angle at which the light-emitting side is inclined relative to the side of the substrate is the same as the angle at which the second light-emitting side is inclined to the side of the substrate. In a direction perpendicular to the side, the first rectangular light-emitting elements and the The second rectangular light-emitting elements are arranged in a staggered manner, and the angle of the adjacent first light-emitting side relative to the side inclined to the substrate in the direction perpendicular to the side is the same as that of the second light-emitting side relative to the side inclined to the substrate. side angle.

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