Backlight module

Abstract

A backlight module comprises a circuit board, a reflecting layer, a light guide plate and an anti-dazzling screen which are sequentially arranged from bottom to top. The anti-dazzling screen comprises first and second single-key light-transmitting areas and first and second light-shading areas. The first light shielding region is located between the first and second single-key light-transmitting regions. The second shading area is located on one side of the second single-key light-transmitting area. The light guide plate comprises a first light guide area and a second light guide area which respectively correspond to the first single-key light-transmitting area and the second single-key light-transmitting area, and a first accommodating hole and a second accommodating hole which respectively correspond to the first light-shielding area and the second light-shielding area. The circuit board is provided with a first light-emitting piece and a second light-emitting piece which are contained in the first containing hole and the second containing hole respectively and emit light towards the first light guide area and the second light guide area respectively. The reflecting layer is provided with a first opening and a second opening. The first and second light-emitting members are respectively disposed at the first and second openings.

Description

TECHNICAL FIELD

[0001] The present invention relates to a backlight module, and more particularly to a backlight module suitable for a keyboard. BACKGROUND

[0002] In the prior art, in order to control the color of the light emitted from each key, one or more light emitting elements are placed under each keycap. The light emitting elements usually include a red light emitting diode (LED) chip, a green LED chip and a blue LED chip. When the red LED chip, the green LED chip and the blue LED chip emit light at the same time, the overlapping area of the red light, the green light and the blue light appears white light (i.e. the red light, the green light and the blue light mixed into white light), and the other areas appear red light, green light, blue light, yellow light (red light + green light), cyan light (green light + blue light) and magenta (red light + blue light). Since the light emitting elements are arranged under the keycap, the distance between the light emitting elements and the keycap is not sufficient to mix the light emitted by the red LED chip, the green LED chip and the blue LED chip into white light, so that the key cannot present pure white light, but presents various colors of light. SUMMARY

[0003] To solve the foregoing technical problem, the present invention provides a backlight module, which includes a light shielding sheet, a light guide plate, a circuit board and a reflective layer. The light shielding sheet includes a first single-key light transmission area, a second single-key light transmission area, a first light shielding area and a second light shielding area. The first light shielding area is located between the first single-key light transmission area and the second single-key light transmission area. The second light shielding area is located on one side of the second single-key light transmission area. The light guide plate is arranged below the light shielding sheet and includes a first light guide area, a second light guide area, a first accommodating hole and a second accommodating hole. The first light guide area and the second light guide area correspond to the first single-key light transmission area and the second single-key light transmission area, respectively. The first accommodating hole and the second accommodating hole correspond to the first light shielding area and the second light shielding area, respectively. The circuit board is arranged below the light guide plate and is provided with a first light emitting element and a second light emitting element. The first light emitting element and the second light emitting element are accommodated in the first accommodating hole and the second accommodating hole, respectively, and emit light toward the first light guide area and the second light guide area, respectively. The first light shielding area and the second light shielding area are used to shield the light emitted upward by the first light emitting element and the second light emitting element, respectively. The reflective layer is arranged on the circuit board and is provided with a first opening and a second opening. The first light emitting element is arranged at the first opening, and the second light emitting element is arranged at the second opening.

[0004] In an embodiment, the light guide plate includes a light mixing area located between an emitting surface of the first light emitting element and the first light guide area.

[0005] In an embodiment, a distance between an out-lighting surface of the first light-emitting member and the first light-guiding region is greater than or equal to a distance between the out-lighting surface of the first light-emitting member and the second light-guiding region.

[0006] In an embodiment, the light-guiding plate is provided with one or more light-blocking portions located on one or more sides of the first light-guiding region.

[0007] In an embodiment, the light-blocking portions include hollow portions, slits, microstructures, or combinations thereof.

[0008] In an embodiment, the reflective layer is provided with one or more light-blocking portions on a surface facing the light-guiding plate, the light-blocking portions corresponding to the light-blocking portions of the light-guiding plate.

[0009] In an embodiment, a light-reflecting portion is provided on a surface of the light-shielding sheet facing the light-guiding plate, the light-reflecting portion being located within the first light-shielding region and corresponding to the first accommodating hole.

[0010] In an embodiment, a periphery of the first opening is substantially aligned with an outer edge of the first light-emitting member or located between the outer edge of the first light-emitting member and a conductive portion of the first light-emitting member, the first light-emitting member being electrically connected to the circuit board through the conductive portion.

[0011] In an embodiment, the first light-emitting member includes a light-emitting portion and a non-light-emitting portion, a projection of the light-emitting portion on the reflective layer not overlapping the first opening.

[0012] In an embodiment, the light-shielding sheet further includes a third single-key light-transmitting region, a third light-shielding region located on a first side edge of the third single-key light-transmitting region, and a fourth light-shielding region located on a second side edge of the third single-key light-transmitting region, the first side edge having a length greater than that of a side edge of the first single-key light-transmitting region, the light-guiding plate further including a third light-guiding region, a third accommodating hole, and a fourth accommodating hole corresponding to the third single-key light-transmitting region, the circuit board further being provided with a third light-emitting member and a fourth light-emitting member, the third light-emitting member and the fourth light-emitting member being accommodated in the third accommodating hole and the fourth accommodating hole, respectively, and emitting light toward the third light-guiding region; the third accommodating hole and the fourth accommodating hole both corresponding to the third light-shielding region, or the third accommodating hole and the fourth accommodating hole corresponding to the third light-shielding region and the fourth light-shielding region, respectively. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 An exploded view of a backlight module according to an embodiment of the present application.

[0014] Figure 2 A schematic view of a light-shielding sheet according to an embodiment of the present application. Figure 1

[0015] Figure 3 A schematic view of a light-shielding sheet according to an embodiment of the present application.​Figure 1 Schematic diagram of the light guide plate in FIG.

[0016] Figure 4 for Figure 1 Schematic diagram of the combination of the light guide plate and the circuit board.

[0017] Figure 5 for Figure 4 A partial enlarged view of the combination of the light guide plate and the circuit board.

[0018] Figure 6 This is a partially enlarged view of a light guide plate according to another embodiment of the present invention.

[0019] Figure 7 FIG. 4 is a schematic diagram of a circuit board according to another embodiment of the present invention.

[0020] Figure 8 FIG. 1 is a bottom view of a light shielding sheet according to another embodiment of the present invention.

[0021] Figure 9 FIG. 1 is a partially enlarged view of a circuit board according to another embodiment of the present invention, wherein the light-emitting element is a five-sided LED package.

[0022] Figure 10 This is a partially enlarged view of a circuit board according to another embodiment of the present invention, wherein the light-emitting element is a five-sided LED package.

[0023] Figure 11 FIG1 is a partial enlarged view of a circuit board according to another embodiment of the present invention, wherein the light-emitting element is a side view LED package.

[0024] Wherein, the accompanying drawings are marked as follows:

[0025] 1: Backlight module 2: Shading sheet

[0026] 21: Single key light transmission area 211: First single key light transmission area

[0027] 2111: Side 212: Second single-key light-transmitting area

[0028] 213: Third single key light transmission area 2131: First side

[0029] 2132: Second side 22: Light-shielding area

[0030] 221: First light-shielding area 222: Second light-shielding area

[0031] 223: Third light-shielding area 224: Fourth light-shielding area

[0032] 23: Reflective part 3: Light guide plate

[0033] 31: light guide region 311: first light guide region

[0034] 312: second light guide region 313: third light guide region

[0035] 32: accommodating hole 321: first accommodating hole

[0036] 322: second accommodating hole 323: third accommodating hole

[0037] 324: fourth accommodating hole 33: light mixing region

[0038] 331: first light mixing region 332: second light mixing region

[0039] 34: light blocking part 341: first light blocking part

[0040] 342: second light blocking part 4: circuit board

[0041] 41: light emitting piece 41C: LED chip

[0042] 41E, 41 IE: conductive part 41L, 41 IL: light emitting part

[0043] 41N, 41 IN: non-light emitting part 41S, 41 IS, 412S: light emitting surface

[0044] 411: first light emitting piece 412: second light emitting piece

[0045] 413: third light emitting piece 414: fourth light emitting piece

[0046] 5: reflective layer 51: opening

[0047] 511: first opening 512: second opening

[0048] 513: third opening 514: fourth opening

[0049] 52: light blocking part A, B, C, D, E: region

[0050] D1, D2, D3: distance H1, H2: hollow part

[0051] L: light ray M1: point-like microstructure

[0052] M2: linear microstructure S1: long slit

[0053] S2: short slit DETAILED DESCRIPTION

[0054] The following, in conjunction with the accompanying drawings, provides a clear and complete description of various embodiments of the present invention. The elements in the drawings are not drawn to scale and are intended solely to illustrate various embodiments of the present invention. The terms "first," "second," and so forth, mentioned below, do not denote any order, quantity, or importance; they are used solely to distinguish between different elements, parts, and regions.

[0055] See also Figure 1 The present invention provides a backlight module 1, which includes a light shielding sheet 2, a light guide plate 3, a circuit board 4 and a reflective layer 5. The light shielding sheet 2 includes a plurality of single-key light-transmitting areas 21 and a plurality of light-shielding areas 22. Figure 2 , the single-key light-transmitting areas 21 may include a first single-key light-transmitting area 211 and a second single-key light-transmitting area 212. The light-shielding areas 22 may include a first light-shielding area 221 and a second light-shielding area 222. The first light-shielding area 221 is located between the first single-key light-transmitting area 211 and the second single-key light-transmitting area 212. The second light-shielding area 222 is located on one side of the second single-key light-transmitting area 212. That is, except for the side of the second single-key light-transmitting area 212 close to the first single-key light-transmitting area 211, the second light-shielding area 222 may be located on any side of the second single-key light-transmitting area 212. For example, in Figure 2 In the region A, the second light shielding area 222 is located on the side of the second single-key light-transmitting area 212 away from the first single-key light-transmitting area 211, that is, the first light shielding area 221 and the second light shielding area 222 are located on opposite sides of the second single-key light-transmitting area 212. Figure 2 In the area B and the area C, the first light-shielding area 221 and the second light-shielding area 222 are located on two adjacent sides of the second single-key light-transmitting area 212 .

[0056] See also Figure 1 The light guide plate 3 is disposed below the light shielding sheet 2. The light guide plate 3 includes a plurality of light guide areas 31 corresponding to the single-key light-transmitting areas 21, and a plurality of receiving holes 32 corresponding to the light shielding areas 22. The light guide areas 31 may be provided with microstructures for guiding light toward the single-key light-transmitting areas 21. Figure 3 The light guide areas 31 may include a first light guide area 311 and a second light guide area 312. The receiving holes 32 may include a first receiving hole 321 and a second receiving hole 322. Figure 2 and Figure 3 In regions A, B, and C, the first light guide region 311 and the second light guide region 312 correspond to the first single-key light-transmitting region 211 and the second single-key light-transmitting region 212, respectively. The first receiving hole 321 and the second receiving hole 322 correspond to the first light-shielding region 221 and the second light-shielding region 222, respectively.

[0057] See also Figure 1The circuit board 4 is disposed below the light guide plate 3. The circuit board 4 is provided with a plurality of light emitting elements 41 corresponding to the accommodation holes 32. Each light emitting element 41 is accommodated in an accommodation hole 32 and emits light toward a light guide area 31. The light emitted upward by each light emitting element 41 is blocked by a light shielding area 22. Figure 4 The light emitting elements 41 may include a first light emitting element 411 and a second light emitting element 412. The first light emitting element 411 and the second light emitting element 412 are respectively received in the first receiving hole 321 and the second receiving hole 322, and emit light L toward the first light guide area 311 and the second light guide area 312, respectively. Figure 2 and Figure 4 The first light-shielding area 221 and the second light-shielding area 222 are respectively used to block the light emitted upward by the first light-emitting element 411 and the second light-emitting element 412 .

[0058] See also Figure 1 , the reflective layer 5 is disposed on the circuit board 4. Specifically, the reflective layer 5 is disposed on the surface of the circuit board 4 close to the light guide plate 3. The reflective layer 5 has a plurality of openings 51. Each light emitting element 41 is disposed at an opening 51. The reflective layer 5 is used to reflect the light emitted by the light emitting elements 41 toward the circuit board 4 to the light guide plate 3. For example, see Figure 4 In area A, the openings 51 include a first opening 511 and a second opening 512, the first light-emitting component 411 is arranged at the first opening 511, and the second light-emitting component 412 is arranged at the second opening 512, and the reflective layer 5 is used to reflect the light emitted by the first light-emitting component 411 and the second light-emitting component 412 toward the circuit board 4 to the light guide plate 3.

[0059] See also Figure 5 In the backlight module of the present invention, the first light emitting element 411 is disposed in the first receiving hole 321 between the first light guide area 311 and the second light guide area 312 of the light guide plate 3, so that the light L emitted by the first light emitting element 411 must travel a certain distance D1 after entering the light guide plate 3 before entering the first light guide area 311. Therefore, the light L emitted by the first light emitting element 411 has a sufficient distance to be evenly mixed before entering the first light guide area 311, so that no bright spots appear in the first light guide area 311. Subsequently, the evenly mixed light L is refracted by the microstructures in the first light guide area 311 to the Figure 2The first single-key light transmission area 211 of the light shield 2 is configured to make the brightness of each part of the first single-key light transmission area 211 uniform. In the case that the first light emitting member 411 has a plurality of LED chips of different colors and two or more of the LED chips emit light at the same time, the distance D1 is sufficient to make the light of different colors emitted by the LED chips uniformly mixed into a single color, so that the light L in the first light guide area 311 and the first single-key light transmission area 211 has a single color. Similarly, the second light emitting member 412 is arranged in the second accommodating hole 322 on the side of the second light guide area 312, so that the light L emitted by the second light emitting member 412 has to pass through a certain distance D2 after entering the light guide plate 3 to enter the second light guide area 312. Therefore, the light L emitted by the second light emitting member 412 has sufficient distance to be uniformly mixed before entering the second light guide area 312, so that there is no bright spot in the second light guide area 312. Then, the uniformly mixed light L is refracted to the second single-key light transmission area 212 through the microstructure in the second light guide area 312. Figure 2 The second single-key light transmission area 212 of the light shield 2 is configured to make the brightness of each part of the second single-key light transmission area 212 uniform. In the case that the second light emitting member 412 has a plurality of LED chips of different colors and two or more of the LED chips emit light at the same time, the distance D2 is sufficient to make the light of different colors emitted by the LED chips uniformly mixed into a single color, so that the light L in the second light guide area 312 and the second single-key light transmission area 212 has a single color.

[0060] Specifically, referring to Figure 5 The light guide plate 3 includes a plurality of light mixing areas 33. Each light mixing area 33 is located between the light emitting surface 41S of a light emitting member 41 and a light guide area 31. The light mixing areas 33 can include a first light mixing area 331 and a second light mixing area 332. The first light mixing area 331 is located between the light emitting surface 411S of the first light emitting member 411 and the first light guide area 311, so that the light L emitted by the first light emitting member 411 has sufficient space to mix. The second light mixing area 332 is located between the light emitting surface 412S of the second light emitting member 412 and the second light guide area 312, so that the light L emitted by the second light emitting member 412 has sufficient space to mix. In an embodiment, the distance D1 between the light emitting surface 411S of the first light emitting member 411 and the first light guide area 311 (i.e. the width of the first light mixing area 331) can be greater than or equal to the distance D3 between the light emitting surface 411S of the first light emitting member 411 and the second light guide area 312, so that the light L emitted by the first light emitting member 411 is more uniformly mixed. The distance D2 between the light emitting surface 412S of the second light emitting member 412 and the second light guide area 312 (i.e. the width of the second light mixing area 332) can be equal to the distance D1 between the light emitting surface 411S of the first light emitting member 411 and the first light guide area 311, so that the light L emitted by the second light emitting member 412 is more uniformly mixed.

[0061] In the backlight module of the present invention, each light-emitting element 41 is provided corresponding to a light-shielding area 22, and is located between two light-guiding areas 31 and provides light to one of the light-guiding areas 31, or is located on one side of a light-guiding area 31 and provides light to the light-guiding area 31. There is a certain distance (i.e., the width of the light-mixing area 33) between each light-emitting element 41 and the light-guiding area 31 it illuminates, and this distance is sufficient to allow the light L emitted by each light-emitting element 41 to be evenly mixed before entering the single-key light-transmitting area 21. Accordingly, the backlight module of the present invention can not only individually control the color of the light L emitted from each single-key light-transmitting area 21, but also ensure that the light L emitted from each single-key light-transmitting area 21 has a single color, and the brightness of each part of each single-key light-transmitting area 21 is consistent.

[0062] See also Figure 2 In one embodiment, the single-key light-transmitting areas 21 of the light-shielding sheet 2 may further include a third single-key light-transmitting area 213, and the light-shielding areas 22 of the light-shielding sheet 2 may further include a third light-shielding area 223 located on a first side 2131 of the third single-key light-transmitting area 213, and a fourth light-shielding area 224 located on a second side 2132 of the third single-key light-transmitting area 213. The length of the first side 2131 is greater than the length of the side 2111 of the first single-key light-transmitting area 211. In this embodiment, the extending direction of the side 2111 of the first single-key light-transmitting area 211 and the first side 2131 of the third single-key light-transmitting area 213 are parallel to the extending direction of the long side 20 of the light-shielding sheet 2, and the first side 2131 of the third single-key light-transmitting area 213 is adjacent to the second side 2132, but the present invention is not limited thereto. In other embodiments, the side edge 2111 of the first single-key light-transmitting area 211 and the first side edge 2131 of the third single-key light-transmitting area 213 may extend in a direction perpendicular to the direction of the long side 20 of the light-shielding sheet 2, and / or the first side edge 2131 of the third single-key light-transmitting area 213 may be opposite to the second side edge 2132. Figure 2 and Figure 3 The light guide areas 31 of the light guide plate 3 may further include a third light guide area 313 corresponding to the third single-key light-transmitting area 213, and the accommodation holes 32 of the light guide plate 3 may further include a third accommodation hole 323 and a fourth accommodation hole 324. Figure 4 The light emitting elements 41 of the circuit board 4 may further include a third light emitting element 413 and a fourth light emitting element 414. The third light emitting element 413 and the fourth light emitting element 414 are respectively received in the third receiving hole 323 and the fourth receiving hole 324 and emit light toward the third light guide area 313. Figure 2 and Figure 4 In one embodiment, the third receiving hole 323 and the fourth receiving hole 324 may both correspond to the third light shielding area 223. Figure 2 and Figure 4In area E, in another embodiment, the third accommodating hole 323 and the fourth accommodating hole 324 correspond to the third light-shielding area 223 and the fourth light-shielding area 224, respectively. Like the first light-emitting element 411 and the second light-emitting element 412, the third light-emitting element 413 and the fourth light-emitting element 414 have a certain distance (i.e., the width of the light-mixing area 33) from the light-guiding area 31 (i.e., the third light-guiding area 313) they illuminate. This distance is sufficient to allow the light L emitted by the third light-emitting element 413 and the fourth light-emitting element 414 to be evenly mixed before entering the single-key light-transmitting area 21 (i.e., the third single-key light-transmitting area 213). In this embodiment, for the third single-key light-transmitting area 213 with a longer side, multiple light-emitting elements 41 are used to provide light thereto, so that the third single-key light-transmitting area 213 has sufficient brightness. In addition, please refer to Figure 4 In area D, the openings 51 further include a third opening 513 and a fourth opening 514, the third light-emitting element 413 is disposed at the third opening 513, and the fourth light-emitting element 414 is disposed at the fourth opening 514, and the reflective layer 5 is used to reflect the light emitted by the third light-emitting element 413 and the fourth light-emitting element 414 toward the circuit board 4 to the light guide plate 3.

[0063] See also Figure 6 In one embodiment, the light guide plate 3 may be provided with one or more light-isolating portions 34. These light-isolating portions 34 are located on one or more sides of at least one light guide area 31 and are used to block the light emitted to the light guide area 31 from being transmitted to other light guide areas 31. For example, one or more light-isolating portions 34 are located on one or more sides of the first light guide area 311 to prevent the light L of the first light-emitting element 411 from being transmitted to other light guide areas 31. These light-isolating portions 34 may include a first light-isolating portion 341 and / or a second light-isolating portion 342. The first light-isolating portion 341 and the light-emitting element 41 are respectively located on opposite sides of the light guide area 31. The second light-isolating portion 342 and the light-emitting element 41 are respectively located on adjacent sides of the light guide area 31. For example, the first light-emitting element 411 is located on the left side of the first light guide area 311, the first light-isolating portion 341 is located on the right side of the first light guide area 311, and the two second light-isolating portions 342 are respectively located on the upper and lower sides of the first light guide area 311. The light-isolating portions 34 may include hollow portions, slits, microstructures or a combination thereof. For example, a light-isolating portion 34 may include a hollow portion H1 in a rectangular, wavy, serrated or other shape extending along a side of the light-guiding area 31. A light-isolating portion 34 may include a plurality of hollow portions H2 in a circular, triangular, square, rectangular or other shape arranged along a side of the light-guiding area 31. A light-isolating portion 34 may include a plurality of long slits S1 extending along a side of the light-guiding area 31. A light-isolating portion 34 may include a plurality of short slits S2 arranged along a side of the light-guiding area 31. A light-isolating portion 34 may include a plurality of microstructures, which may be dot-shaped microstructures M1, line-shaped microstructures M2 or microstructures of other shapes. Figure 6Only some examples of the light-isolating portion 34 are shown. The specific structure and arrangement of the light-isolating portion 34 can be designed according to actual needs.

[0064] See also Figure 1 and Figure 7 In one embodiment, the reflective layer 5 may be provided with one or more light blocking portions 52 on the surface facing the light guide plate 3. Figure 6 and Figure 7 The light-blocking portions 52 correspond to the light-isolating portions 34 of the light guide plate 3. The light-blocking portions correspond to one or more sides of at least one light-guiding region 31 to prevent light from the light-guiding region 31 from being transmitted to other light-guiding regions 31. The light-blocking portions 52 can be made of black ink, but are not limited thereto.

[0065] See also Figure 1 and Figure 8 In one embodiment, the surface of the light shielding sheet 2 facing the light guide plate 3 may be provided with a plurality of light reflecting portions 23. Figure 4 and Figure 8 Each reflective portion 23 is located within a light-shielding region 22 and corresponds to a receiving hole 32, thereby reflecting light emitted upward by the light-emitting element 41 in the receiving hole 32 toward the light guide plate 3, thereby enhancing the brightness of the backlight module 1. For example, a reflective portion 23 is located within the first light-shielding region 221 and corresponds to the first receiving hole 321, thereby reflecting light emitted upward by the first light-emitting element 411 toward the light guide plate 3. These reflective portions 23 can be made of white ink, but are not limited thereto.

[0066] See also Figure 1 and Figure 9 In one embodiment, the light emitting element 41 may be a five-sided LED package, such as a miniLED. The light emitting element 41 has a plurality of conductive portions 41E, through which the light emitting element 41 is electrically connected to the circuit board 4. Specifically, the conductive portions 41E are located on the bottom surface of the light emitting element 41 and are disposed on the portion of the circuit board 4 exposed by the opening 51. The periphery of the opening 51 of the reflective layer 5 may be substantially aligned with the outer edge of the light emitting element 41, so that the reflective layer 5 can reflect more light emitted by the light emitting element 41 to the light guide plate 3, thereby improving the brightness of the backlight module 1. Please refer to Figure 1 and Figure 10In another embodiment, the periphery of the opening 51 of the reflective layer 5 may be located between the outer edge of the light-emitting element 41 and the conductive portions 41E of the light-emitting element 41. This allows the reflective layer 5 to reflect more light emitted by the light-emitting element 41 toward the light guide plate 3, thereby further improving the brightness of the backlight module 1. For example, the first light-emitting element 411 has a plurality of conductive portions 411E and is electrically connected to the circuit board via these conductive portions 411E. The periphery of the first opening 511 is substantially aligned with the outer edge of the first light-emitting element 411 or located between the outer edge of the first light-emitting element 411 and the conductive portions 411E of the first light-emitting element 411, thereby reflecting more light emitted by the first light-emitting element 411 toward the light guide plate 3.

[0067] See also Figure 1 and Figure 11 In one embodiment, the light-emitting element 41 may be a side-emitting LED package and include a light-emitting portion 41L and a non-light-emitting portion 41N. The light-emitting portion 41L may include a single LED chip 41C or multiple LED chips 41C of different colors. In this embodiment, the light-emitting portion 41L may include green, blue, and red LED chips 41C, but is not limited thereto. In another embodiment, the light-emitting portion 41L may include green, blue, red, and white LED chips 41C. The projection of the light-emitting portion 41L on the reflective layer 5 does not overlap with the opening 51. That is, the light-emitting portion 41L is located on the reflective layer 5, allowing the reflective layer 5 to reflect more light emitted by the light-emitting element 41 toward the light guide plate 3, thereby increasing the brightness of the backlight module 1. For example, the first light-emitting element 411 includes a light-emitting portion 411L and a non-light-emitting portion 411N. The projection of the light-emitting portion 411L on the reflective layer 5 does not overlap with the first opening 511, allowing the reflective layer 5 to reflect more light emitted by the first light-emitting element 411 toward the light guide plate 3. The non-light-emitting portion 41N may include a plurality of conductive portions 41E disposed on the portion of the circuit board 4 exposed by the opening 51. The light-emitting element 41 is electrically connected to the circuit board 4 via the conductive portions 41E. For example, the first light-emitting element 411 includes a plurality of conductive portions 411E disposed on the portion of the circuit board 4 exposed by the first opening 511.

[0068] Several embodiments have been described above in detail to enable those skilled in the art to fully understand the concepts of the present invention. Those skilled in the art may modify the technical solutions in the aforementioned embodiments or substitute equivalents for one or more of the technical features therein to achieve the same objectives and / or advantages as the aforementioned embodiments, and such modifications or equivalent substitutions shall be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the appended patent applications.

Claims

1. A backlight module, characterized in that: include: A light shielding sheet, comprising a first single-key light-transmitting area, a second single-key light-transmitting area, a first light-shielding area, and a second light-shielding area, wherein the first light-shielding area is located between the first single-key light-transmitting area and the second single-key light-transmitting area, and the second light-shielding area is located on one side of the second single-key light-transmitting area; a light guide plate disposed below the light shielding sheet, comprising a first light guide area, a second light guide area, a first receiving hole, and a second receiving hole, wherein the first light guide area and the second light guide area correspond to the first single-key light-transmitting area and the second single-key light-transmitting area, respectively, and the first receiving hole and the second receiving hole correspond to the first light shielding area and the second light shielding area, respectively; a circuit board disposed below the light guide plate and provided with a first light-emitting element and a second light-emitting element, wherein the first light-emitting element and the second light-emitting element are respectively received in the first receiving hole and the second receiving hole and emit light toward the first light guide area and the second light guide area, respectively, and the first light-shielding area and the second light-shielding area are respectively used to shield the light emitted upward by the first light-emitting element and the second light-emitting element; and A reflective layer is arranged on the circuit board and is provided with a first opening and a second opening, wherein the first light emitting component is arranged at the first opening, and the second light emitting component is arranged at the second opening.

2. The backlight module according to claim 1, wherein: The light guide plate includes a light mixing area, and the light mixing area is located between a light emitting surface of the first light emitting component and the first light guide area.

3. The backlight module according to claim 1, wherein: A distance between a light-emitting surface of the first light-emitting element and the first light-guiding area is greater than or equal to a distance between the light-emitting surface of the first light-emitting element and the second light-guiding area.

4. The backlight module according to claim 1, wherein: The light guide plate is provided with one or more light isolation parts, and the light isolation parts are located at one or more sides of the first light guide area.

5. The backlight module according to claim 4, wherein: The light-isolating portions include hollow portions, slits, microstructures or a combination thereof.

6. The backlight module according to claim 4, wherein: One or more light-blocking portions are provided on a surface of the reflective layer facing the light guide plate, and the light-blocking portions correspond to the light-isolating portions of the light guide plate.

7. The backlight module according to claim 1, wherein: A light reflecting portion is provided on a surface of the light shielding sheet facing the light guide plate. The light reflecting portion is located in the first light shielding area and corresponds to the first receiving hole.

8. The backlight module according to claim 1, wherein: A peripheral edge of the first opening is substantially aligned with an outer edge of the first light emitting component, or is located between the outer edge of the first light emitting component and a conductive portion of the first light emitting component, and the first light emitting component is electrically connected to the circuit board through the conductive portion.

9. The backlight module according to claim 1, wherein: The first light-emitting element includes a light-emitting portion and a non-light-emitting portion. A projection of the light-emitting portion on the reflective layer does not overlap with the first opening.

10. The backlight module according to claim 1, wherein: The shading sheet further includes a third single-key light-transmitting area, a third light-shielding area located on a first side of the third single-key light-transmitting area, and a fourth light-shielding area located on a second side of the third single-key light-transmitting area, wherein the length of the first side is greater than the length of one side of the first single-key light-transmitting area; the light guide plate also includes a third light guide area corresponding to the third single-key light-transmitting area, a third accommodating hole and a fourth accommodating hole, wherein the third accommodating hole and the fourth accommodating hole both correspond to the third light-shielding area or correspond to the third light-shielding area and the fourth light-shielding area respectively; the circuit board is also provided with a third light-emitting component and a fourth light-emitting component, wherein the third light-emitting component and the fourth light-emitting component are respectively accommodated in the third accommodating hole and the fourth accommodating hole and emit light toward the third light guide area.

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