Light source assembly, backlight module and display device

Abstract

The present invention relates to a light source assembly, a backlight module and a display device. The light source assembly includes a circuit board, a plurality of light-emitting components and a plurality of strip-shaped microstructures arranged on the circuit board. The circuit board has a length direction and a width direction, the length direction and the width direction are perpendicular to each other, a plurality of the light-emitting components are arranged on the circuit board at intervals along the length direction, and the strip-shaped microstructures extend along the width direction and are arranged on the circuit board. The strip-shaped microstructures can also be arranged on a reflective sheet. The backlight module and the display device include the aforementioned light source assembly, and the problem of uneven brightness (Hot‑Spot) easily generated on the light incident side of the backlight module and the display device can be effectively improved by the design of the strip-shaped microstructure and its setting position.

Description

Technical Field

[0001] The invention relates to a light guide element and application thereof, and in particular to a light source assembly, a backlight module and a display device. Background Art

[0002] The existing backlight module mainly includes a light source and a light guide plate, and the light source includes a circuit board and a light emitting diode arranged on the surface of the circuit board. The light guide plate is arranged next to the light emitting diode, and the light incident surface of the light guide plate is attached to the light emitting surface of the light emitting diode, or there is only a small gap, so that the light of the light emitting diode can be effectively utilized.

[0003] In response to the global market trend of green environmentally friendly products, power consumption is usually reduced by adjusting the current or reducing the number of LEDs. However, if the number of LEDs is reduced, the dark area between the LEDs will increase, so it is easy to have dark bands or uneven brightness (hot-spot) on the light-emitting surface of the light guide plate near the LEDs, which will seriously affect the optical appearance of the light guide plate. Summary of the invention

[0004] Therefore, an object of the present invention is to provide a light source assembly that can solve the problem of uneven brightness (hot-spot) that is easily generated on the light incident side.

[0005] The light source assembly according to the present invention comprises a circuit board, a plurality of light-emitting elements arranged on the circuit board, and a plurality of strip-shaped microstructures. The circuit board has a length direction and a width direction, the length direction and the width direction are perpendicular to each other, a plurality of the light-emitting elements are arranged on the circuit board at intervals along the length direction, and the strip-shaped microstructures extend along the width direction and are arranged on the circuit board.

[0006] According to the light source assembly of the present invention, it comprises a frame, a circuit board arranged on the frame, a plurality of light-emitting components arranged on the circuit board, and a reflection unit arranged on the frame. The frame comprises a bottom frame section, a side frame section connected to the bottom frame section, and a frame section connected to the side frame section, the bottom frame section and the frame section both have a width direction, and the bottom frame section and the frame section extend from the side frame section along the width direction. The circuit board has a length direction, and a plurality of the light-emitting components are arranged on the circuit board at intervals along the length direction. The reflection unit comprises a reflection sheet and a plurality of strip-shaped microstructures, wherein the reflection sheet is arranged on the frame section of the frame and faces the light-emitting components, and the strip-shaped microstructures extend along the width direction and are arranged on the reflection sheet.

[0007] According to another technical means of the present invention, the strip-shaped microstructure is a protruding structure.

[0008] According to another technical means of the present invention, the cross-sectional shape of the strip-shaped microstructure is semicircular.

[0009] According to another technical means of the present invention, the strip microstructure has multiple first microstructures and multiple second microstructures, the first microstructure is located between adjacent light-emitting components, the second microstructure is located at a position corresponding to the light-emitting component, and the reflection ability of the first microstructure is greater than the reflection ability of the second microstructure.

[0010] The backlight module according to the present invention comprises the aforementioned light source assembly and light guide plate, wherein the light guide plate has a light incident surface and a light emitting surface, the light emitting element emits light toward the light incident surface of the light guide plate, and the strip-shaped microstructure faces the light emitting surface of the light guide plate to reflect light back to the light emitting surface.

[0011] The display device according to the present invention comprises the aforementioned backlight module and a display panel arranged on the backlight module.

[0012] The effect of the present invention is that, by means of the design of the strip microstructure and the location of its arrangement, the problem of uneven brightness (hot-spot) easily generated on the light incident side of the backlight module and the display device is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a side view schematic diagram showing a first preferred embodiment of the backlight module of the present invention;

[0014] Figure 2 Yes Description Figure 1 A partial bottom view schematic diagram of the relative positions of the circuit board, multiple light-emitting elements and multiple strip-shaped microstructures;

[0015] Figure 3 It is a description along Figure 1 A schematic side view of a part cut by the III-III cutting plane line;

[0016] Figure 4 is a side view schematic diagram showing a second preferred embodiment of the backlight module of the present invention;

[0017] Figure 5 It is a description along Figure 4 A schematic side view of a part cut by the VV cutting plane line in FIG. 1 ; and

[0018] Figure 6 1 is a schematic side view showing a preferred embodiment of the display device of the present invention. DETAILED DESCRIPTION

[0019] The technical content of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings. Before the detailed description, it should be noted that similar elements are represented by the same reference numerals.

[0020] See also Figure 1 , which is the first preferred embodiment of the backlight module of the present invention, comprises a frame 2, a circuit board 3 disposed on the frame 2, a plurality of light emitting elements 4 (only one is shown due to the viewing angle) disposed on the circuit board 3 at intervals, and a light guide plate 5 disposed on the frame 2. The light guide plate 5 has a light incident surface 51 and a light emitting surface 52, and the light emitting element 4 emits light toward the light incident surface 51 of the light guide plate 5. Figure 2 As shown, in this embodiment, the circuit board 3 has a length direction X and a width direction Y, the length direction X and the width direction Y are perpendicular to each other, and a plurality of light emitting elements 4 are arranged on the circuit board 3 along the length direction X at intervals.

[0021] See also Figure 2 and Figure 3 , a plurality of strip-shaped microstructures 6 are arranged on the circuit board 3. The plurality of strip-shaped microstructures 6 are also arranged on the circuit board 3 at intervals along the length direction X, and each strip-shaped microstructure 6 extends along the width direction Y. The strip-shaped microstructure 6 is a protruding structure, and the cross-sectional shape of each strip-shaped microstructure 6 is a semicircle.

[0022] It should be noted that if Figure 3 As shown, in this preferred embodiment, the strip microstructure 6 faces the light emitting surface 52 of the light guide plate 5 to reflect the light back to the light emitting surface 52. The strip microstructure 6 has a plurality of first microstructures 61 and a plurality of second microstructures 62. The first microstructure 61 is located between adjacent light emitting elements 4, the second microstructure 62 is located at a position corresponding to the light emitting element 4, and the reflective ability of the first microstructure 61 is greater than the reflective ability of the second microstructure 62. It should be particularly noted that, in this embodiment, the strip microstructures 6 are closely arranged without gaps. In addition, the reflective ability of the first microstructure 61 can be made greater than the reflective ability of the second microstructure 62 by coating the first microstructure 61 with a high reflective material.

[0023] See also Figure 1 and Figure 3, through the design of forming a strip microstructure 6 on the circuit board 3, when the light of the light-emitting element 4 enters the light guide plate 5 through the light incident surface 51 of the light guide plate 5, the light with a larger angle will be emitted first, and these light rays emitted first will be reflected by the strip microstructure 6 and return to the light guide plate 5 for transmission. Since the first microstructure 61 is located between adjacent light-emitting elements 4, the reflection angle of the light of the light-emitting element 4 can be increased, and the light can be reflected at a larger angle to the area with lower brightness between adjacent light-emitting elements 4, thereby increasing the degree of opening of the light field of the light-emitting element 4, and solving the problem of uneven brightness (Hot-Spot) caused by the widening of the interval caused by the reduction in the number of light-emitting elements 4 on the light incident side of the light guide plate 5. In addition, because the number of light-emitting elements 4 is reduced at the same time, it is also possible to reduce the luminous power of the light-emitting element 4 to achieve greater economic benefits, and it is also possible to reduce the use cost of the light-emitting element 4.

[0024] On the other hand, since the reflective ability of the first microstructure 61 is greater than that of the second microstructure 62 and the first microstructure 61 is located between adjacent light-emitting elements 4, the reflectivity of light at the position between adjacent light-emitting elements 4 can be significantly improved, which helps to reduce the brightness unevenness (mura) phenomenon and improve the optical appearance of the light-emitting surface.

[0025] See also Figure 4 , which is a second preferred embodiment of the backlight module of the present invention, includes a frame 2a, a circuit board 3a arranged on the frame 2a, a plurality of light-emitting elements 4a (only one is shown due to the viewing angle) arranged at intervals on the circuit board 3a, a light guide plate 5a arranged on the frame 2a, and a reflection unit 7 arranged on the frame 2a.

[0026] The frame 2a includes a bottom frame section 21a, a side frame section 22a connected to the bottom frame section 21a, and a frame section 23a connected to the side frame section 22a. Both the bottom frame section 21a and the frame section 23a have a width direction, and the bottom frame section 21a and the frame section 23a extend from the side frame section 22a along the width direction. The light guide plate 5a is disposed on the bottom frame section 21a and has a light incident surface 51a and a light emitting surface 52a. The light emitting member 4a emits light toward the light incident surface 51a of the light guide plate 5a.

[0027] See also Figure 4 and Figure 5 The circuit board 3a is disposed on the bottom frame segment 21a and has a length direction X and a width direction Y, and the length direction X and the width direction Y are perpendicular to each other. In this embodiment, since the circuit board 3a is disposed on the bottom frame segment 21a, the width direction Y of the circuit board 3a coincides with the width directions of the bottom frame segment 21a and the frame segment 23a. Figure 5As shown, a plurality of light emitting elements 4a are arranged on the circuit board 3a at intervals along the length direction X. In other embodiments, the circuit board 3a may be disposed on the side frame section 22a, so the present embodiment should not be construed as limiting.

[0028] The reflective unit 7 has a reflective sheet 71 and a plurality of strip-shaped microstructures 72. The reflective sheet 71 is disposed on the frame segment 23a of the frame 2a and faces the light-emitting element 4a. Each strip-shaped microstructure 72 extends along the width direction Y and is arranged on the reflective sheet 71. In the preferred embodiment, the strip-shaped microstructure 72 is a protruding structure, and the cross-sectional shape of each strip-shaped microstructure 72 is a semicircular. The strip-shaped microstructure 72 faces the light-emitting surface 52a of the light guide plate 5a to reflect light back to the light-emitting surface 52a.

[0029] like Figure 5 As shown, in this preferred embodiment, the strip microstructure 72 has a plurality of first microstructures 721 and a plurality of second microstructures 722, the first microstructures 721 are located between adjacent light emitting elements 4a, the second microstructures 722 are located at positions corresponding to the light emitting elements 4a, and the reflective capability of the first microstructures 721 is greater than the reflective capability of the second microstructures 722. In this embodiment, the strip microstructures 72 are closely arranged without gaps.

[0030] See also Figure 4 And cooperate Figure 5 By setting the reflective unit 7 on the frame segment 23a of the frame 2a in a manner facing the light emitting element 4a and by forming a strip microstructure 72 on the reflective sheet 71, when the light of the light emitting element 4a enters the light guide plate 5a through the light incident surface 51a of the light guide plate 5a, the light with a larger angle will be emitted first, and these light rays emitted first will be reflected by the strip microstructure 72 and return to the light guide plate 5a for transmission. Since the first microstructure 721 is located between adjacent light emitting elements 4a and has a greater reflective ability than the second microstructure 722, the light of the light emitting element 4a can be reflected to the area with lower brightness between adjacent light emitting elements 4a, thereby increasing the degree of opening of the light field of the light emitting element 4a and reducing the problem of uneven brightness on the light incident side of the light guide plate 5a.

[0031] like Figure 6 As shown, when a display panel 8 is further disposed on the backlight module of the present invention, a display device can be formed.

[0032] In summary, the light source assembly of the present invention can improve the light refraction angle of the light emitting component, increase the degree of light field opening of the light emitting component, reduce the problem of uneven brightness on the light incident side of the light guide plate, and improve the uniformity of lighting by forming a strip microstructure on the circuit board or the reflective sheet and arranging it adjacent to the light incident side of the light guide plate. In addition, through the above design, the number of light emitting components can be reduced, thereby not only achieving the purpose of reducing power consumption, but also reducing the manufacturing cost of the product, so as to truly achieve the purpose of the present invention.

[0033] The above description is only a preferred embodiment of the present invention, and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the patent of the present invention.

[0034] [List of Reference Numerals]

[0035] 2.2a Framework

[0036] 21a Bottom frame section

[0037] 22a Side frame section

[0038] 23a Border segment

[0039] 3. 3a Circuit board

[0040] 4.4a Luminous parts

[0041] 5.5a Light guide plate

[0042] 51, 51a Light incident surface

[0043] 52, 52a Light emitting surface

[0044] 6 Stripe microstructure

[0045] 61 First Microstructure

[0046] 62 Second Microstructure

[0047] 7 Reflection unit

[0048] 71 Reflective sheet

[0049] 72 Strip microstructure

[0050] 721 First Microstructure

[0051] 722 Second Microstructure

[0052] 8 Display Panel

[0053] X length direction

[0054] Y width direction.

Claims

1. A light source assembly, It is characterized in that Include: A circuit board having a length direction and a width direction, wherein the length direction and the width direction are perpendicular to each other; a plurality of light-emitting elements, wherein the plurality of light-emitting elements are arranged on the circuit board at intervals along the length direction; and a plurality of strip-shaped microstructures, wherein the strip-shaped microstructures extend along the width direction and are arranged on the circuit board, Among them, the strip microstructure has multiple first microstructures and multiple second microstructures, the first microstructure is located between adjacent light-emitting components, the second microstructure is located at a position corresponding to the light-emitting component, and the reflection ability of the first microstructure is greater than the reflection ability of the second microstructure.

2. A light source assembly, It is characterized in that Include: A frame, comprising a bottom frame section, a side frame section connected to the bottom frame section, and a frame section connected to the side frame section, wherein both the bottom frame section and the frame section have a width direction, and the bottom frame section and the frame section extend from the side frame section along the width direction; A circuit board, which is disposed on one of the bottom frame segment or the side frame segment and has a length direction; A plurality of light emitting elements, wherein the plurality of light emitting elements are arranged on the circuit board at intervals along the length direction; and A reflective unit having at least one reflective sheet and a plurality of strip-shaped microstructures, wherein the reflective sheet is disposed on the frame segment of the frame and faces the light-emitting element, and the strip-shaped microstructures extend along the width direction and are arranged on the reflective sheet. Among them, the strip microstructure has multiple first microstructures and multiple second microstructures, the first microstructure is located between adjacent light-emitting components, the second microstructure is located at a position corresponding to the light-emitting component, and the reflection ability of the first microstructure is greater than the reflection ability of the second microstructure.

3. The light source assembly according to claim 1 or 2, It is characterized in that The strip-shaped microstructure is a protruding structure.

4. The light source assembly according to claim 3, It is characterized in that The cross-sectional shape of the strip-shaped microstructure is semicircular.

5. A backlight module, It is characterized in that Include: The light source assembly according to any one of claims 1 to 4: and The light guide plate has a light incident surface and a light emitting surface. The light emitting element emits light toward the light incident surface of the light guide plate, and the strip-shaped microstructure faces the light emitting surface of the light guide plate to reflect the light back to the light emitting surface.

6. A display device, It is characterized in that Include: The backlight module according to claim 5; and A display panel is arranged on the backlight module.

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