Backlight module

Abstract

A backlight module includes a circuit board, a reflective layer, a light guide plate, and a light-shielding sheet arranged sequentially from bottom to top. The light-shielding sheet includes first and second single-key light-transmitting areas and first and second light-shielding areas. The first light-shielding area is located between the first and second single-key light-transmitting areas. The second light-shielding area is located on one side of the second single-key light-transmitting area. The light guide plate includes first and second light-guiding areas corresponding to the first and second single-key light-transmitting areas, and first and second receiving holes corresponding to the first and second light-shielding areas, respectively. The circuit board has first and second light-emitting elements respectively received in the first and second receiving holes and emitting light towards the first and second light-guiding areas. The reflective layer has first and second openings. The first and second light-emitting elements are respectively disposed at the first and second openings.

Claims

1. A backlight module, comprising: a light-shielding sheet, including a first single-bond light-transmitting area, a second single-bond 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-bond light-transmitting area and the second single-bond light-transmitting area, and the second light-shielding area is located on one side of the second single-bond light-transmitting area; a light guide plate, disposed below the light-shielding sheet, including 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 respectively correspond to the first single-bond light-transmitting area and the second single-bond light-transmitting area, and the first receiving hole and the second receiving hole respectively correspond to the first light-shielding area and the second light-shielding area; A circuit board is disposed below a light guide plate and includes a first light-emitting element and a second light-emitting element. The first and second light-emitting elements are respectively housed in a first receiving hole and a second receiving hole, emitting light towards the first and second light guide areas, respectively. A first and second light-shielding area are respectively used to block the upward-emitted light from the first and second light-emitting elements. A reflective layer is disposed on the circuit board and includes a first opening and a second opening. The first light-emitting element is disposed at the first opening, and the second light-emitting element is disposed at the second opening. The distance between a light-emitting surface of the first light-emitting element and the first light-guiding area is greater than or equal to the distance between the light-emitting surface of the first light-emitting element and the second light-guiding area.

2. The backlight module of claim 1, wherein the light guide plate includes a light mixing area located between a light emitting surface of the first light-emitting element and the first light guide area.

3. The backlight module of claim 1, wherein the light guide plate is provided with one or more light-blocking parts, the light-blocking parts being located on one or more sides of the first light guide area.

4. The backlight module of claim 3, wherein the light-blocking portions include cutouts, slits, microstructures or combinations thereof.

5. The backlight module of claim 3, wherein one or more light-blocking portions are provided on a surface of the reflective layer facing the light guide plate, the light-blocking portions corresponding to the light-shielding portions of the light guide plate.

6. The backlight module of claim 1, wherein a reflective portion is provided on a surface of the light shield facing the light guide plate, the reflective portion being located within the first light shielding area and corresponding to the first receiving hole.

7. The backlight module of claim 1, wherein a periphery of the first opening is substantially aligned with an outer edge of the first light-emitting element, or located between the outer edge of the first light-emitting element and a conductive portion of the first light-emitting element, the first light-emitting element being electrically connected to the circuit board through the conductive portion.

8. The backlight module of claim 1, wherein the first light-emitting element includes a light-emitting portion and a non-light-emitting portion, and a projection of the light-emitting portion onto the reflective layer does not overlap with the first opening.

9. The backlight module of claim 1, wherein the light-shielding sheet further includes a third single-key light-transmitting area, a third light-shielding area located on a first side of one of the third single-key light-transmitting areas, and a fourth light-shielding area located on a second side of one of the third single-key light-transmitting areas, the length of the first side being greater than the length of one side of the first single-key light-transmitting area; the light guide plate further includes a third light guide area corresponding to the third single-key light-transmitting area, a third receiving hole, and a fourth receiving hole, the third receiving hole and the fourth receiving hole both corresponding to the third light-shielding area or respectively corresponding to the third light-shielding area and the fourth light-shielding area; the circuit board further includes a third light-emitting element and a fourth light-emitting element, the third light-emitting element and the fourth light-emitting element being respectively housed in the third receiving hole and the fourth receiving hole and emitting light toward the third light guide area.

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