BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a backlight module and an input apparatus, and in particular, to a backlight module with a single-sheet light guide plate and an input apparatus using the foregoing light guide plate.

2. Description of Related Art

Light guide plates currently applied to keyboard modules may be classified into multi-sheet assembled light guide plates and single-sheet light guide plate. The multi-sheet assembled light guide plates have an advantage of preventing a light mixing phenomenon occurring in two neighboring regions with different colors. However, the disadvantages are that assembling of the multi-sheet assembled light guide plates is relatively difficult and costs are high. The single-sheet light guide plate does not need to be assembled, but a disadvantage is that no divided regions are disposed thereon, and therefore light in two neighboring regions with different colors is likely to be mixed. Therefore, how to make a light guide plate have an advantage that light exists in different regions with different colors at low costs already becomes one of important subjects.

SUMMARY OF THE INVENTION

The present invention provides a backlight module having a light guide plate with a single-sheet structure, to achieve an effect that the divided regions are achieved by disposing a plurality of opening structures.

The present invention further provides an input apparatus, including the foregoing light guide plate, so as to avoid a light mixing phenomenon occurring in two neighboring light guide regions.

The present invention provides a backlight module, includes a reflection layer, a light guide plate and a mask layer. The light guide plate is disposed on the reflection layer and includes a light guide body, a first opening structure and a second opening structure. The first opening structure passes through the light guide body and including a first closed end, wherein the first closed end has two first branches. The second opening structure passes through the light guide body and includes a second closed end, wherein the first closed end and the second closed end face each other, at least one of the two first branches of the first closed end partially overlaps the second closed end along a first axis, the two first branches of the first closed end are located on two sides of the second closed end along a second axis, and the first axis is substantially perpendicular to the second axis. The light guide plate is disposed between the reflection layer and the mask layer.

The present invention provides an input apparatus, includes a keycap layer, a light guide plate and a light source. The light guide plate is disposed below the keycap layer and includes a light guide body, a first opening structure and a second opening structure. The light guide body includes two light guide regions. The first opening structure passes through the light guide body and includes a first closed end. The second opening structure passes through the light guide body and includes a second closed end, wherein the first opening structure and the second opening structure are disposed between the two light guide regions and spaced apart from each other corresponding to positions between two adjacent keycaps of the keycap layer, the first closed end and the second closed end face each other, the first closed end partially overlaps the second closed end along a first axis, the first closed end and the second closed end are disposed along a second axis, and the first axis is substantially perpendicular to the second axis. The light source is disposed beside a side of the light guide plate.

The present invention provides an input apparatus, including a keycap layer, a reflection layer and a light guide plate. The reflection layer is disposed below the keycap layer. The light guide plate is disposed between the keycap layer and the reflection layer, wherein the light guide plate includes a first light guide region, a second light guide region, a first opening structure and a second opening structure. The second light guide region is partially connected with the first light guide region. The first opening structure is disposed between the first light guide region and the second light guide region, and includes a first extending portion and a first closed end connected to the first extending portion. The second opening structure is disposed between the first light guide region and the second light guide region, and comprising a second extending portion and a second closed end connected to the second extending portion, wherein the first closed end facing the second closed end extends toward the second extending portion.

Based on the foregoing descriptions, the light guide plate of the backlight module in the present invention is a single-sheet light guide plate and achieves, by disposing a plurality of opening structures, an effect that regions are divided into. In addition, the opening structures in the present invention include closed ends such that the light is refracted and reflected thereby. Therefore, when the light in the light guide plate of the input apparatus in the present invention is incident to the closed ends of the opening structures, the light is reflected or totally reflected by the closed ends of the opening structures, and so that light is not mixed in neighboring light guide regions, and the neighboring light guide regions can be performed in different colors.

To make the aforementioned and other objectives and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

