CN-115705974-B - Backlight module

CN115705974BCN 115705974 BCN115705974 BCN 115705974BCN-115705974-B

Abstract

A backlight module comprises a circuit board, a light-emitting unit, a reflecting plate, a light guide plate and a shading sheet. The light-emitting unit is arranged on the circuit board. The reflector is arranged above the circuit board. The light guide plate is arranged above the reflecting plate and comprises a single-bond light guide area. The single-bond light guide region comprises a containing hole and a light blocking structure. The containing hole penetrates through the single-bond light guide area and contains the light-emitting unit. The light blocking structure and the light emitting unit are arranged in a direction. The shading sheet is arranged above the light guide plate. Therefore, the problem of uneven brightness of different areas of the key can be effectively solved.

Inventors

HE XUANWEI
ZHANG YICHENG
LIU XIN

Assignees

群光电能科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20210910
Priority Date: 20210812

Claims (10)

1. A backlight module, comprising: A circuit board; a light-emitting unit arranged on the circuit board; The reflecting plate is arranged above the circuit board; The light guide plate is arranged above the reflecting plate and comprises a single-bond light guide area, and the single-bond light guide area comprises: the containing hole penetrates through the single-key light guide area and contains the light-emitting unit; A first microstructure part arranged at the bottom of the single-key light guide region, and A light-blocking structure arranged in a direction with the light-emitting units, the light-blocking structure being a second microstructure portion composed of a plurality of microstructure units, and And the shading sheet is arranged above the light guide plate.
2. The backlight module according to claim 1, wherein the light shielding sheet has a hollow portion, and the first microstructure portion is configured to guide the light emitted by the light emitting unit to the hollow portion.
3. The backlight module according to claim 2, wherein the first microstructure portion is composed of a plurality of microstructure units, and an area ratio of the microstructure units of the second microstructure portion in a unit area is larger than an area ratio of the microstructure units of the first microstructure portion in a unit area.
4. The backlight module according to claim 2, further comprising: The light absorption layer is arranged on one side of the light shielding sheet facing the light guide plate and is opposite to the second microstructure part in a stacking direction of the light shielding sheet and the light guide plate.
5. The backlight module according to claim 2, wherein the light guide plate further comprises a light guide structure disposed around the single-key light guide region and configured to guide the light emitted from the light emitting unit to the light shielding sheet.
6. The backlight module according to claim 5, wherein the first microstructure portion and the light guiding structure are each composed of a plurality of microstructure units, and an area ratio of the microstructure units of the light guiding structure in a unit area is larger than an area ratio of the microstructure units of the first microstructure portion in a unit area.
7. The backlight module according to claim 1, further comprising: The reflecting layer is arranged between the shading sheet and the light-emitting unit and completely covers an upper opening of the accommodating hole.
8. The backlight module according to claim 1, wherein the reflector is disposed on the circuit board in a region not occupied by the light emitting unit and extends to a region within an inner edge of the receiving hole.
9. The backlight module according to claim 1, wherein the light emitting unit comprises a red light chip, a green light chip and a blue light chip, and the red light chip, the green light chip and the blue light chip are sequentially arranged along the direction.
10. The backlight module of claim 1, wherein the light-emitting unit comprises a blue light chip and phosphor powder covering the blue light chip.

Description

Backlight module Technical Field The present disclosure relates to a keyboard device, and more particularly, to a backlight module for a keyboard device. Background The shape of the traditional keyboard is generally monotonous and rigid, so that manufacturers around the computer develop a luminous keyboard with excellent visual effect. One known lighting keyboard has a backlight module. The backlight module mainly uses the light guide plate to transmit the light emitted by the light source so that each area of the keyboard can emit light. In order to achieve the purpose of independently controlling the light emission of each key, more than one light source is arranged under each key. However, the light source may directly affect the light distribution, so as to cause uneven brightness in different areas of each key. In addition, the light source may be classified into a single color light source and a mixed light source. The light source is made of multiple different-color chips, and can mix light to emit white light when emitting light at the same time. However, on either side of a single wafer only, the problem of off-color arises because the light energy of the wafer is relatively strong. Therefore, how to provide a backlight module capable of solving the above problems is one of the problems to be solved by the research and development resources in the industry. Disclosure of Invention Accordingly, an objective of the present disclosure is to provide a backlight module that can solve the above-mentioned problems. In order to achieve the above objective, according to one embodiment of the present disclosure, a backlight module includes a circuit board, a light emitting unit, a reflector, a light guide plate, and a light shielding sheet. The light-emitting unit is arranged on the circuit board. The reflector is arranged above the circuit board. The light guide plate is arranged above the reflecting plate and comprises a single-bond light guide area. The single-bond light guide region comprises a containing hole and a light blocking structure. The containing hole penetrates through the single-bond light guide area and contains the light-emitting unit. The light blocking structure and the light emitting unit are arranged in a direction. The shading sheet is arranged above the light guide plate. In one or more embodiments of the present disclosure, the single-bond light guiding region further includes a first microstructure portion. The shading sheet is provided with a hollowed-out part. The first microstructure part is configured to guide the light emitted by the light emitting unit to the hollowed-out part. In one or more embodiments of the present disclosure, the light blocking structure is a second microstructure portion. The second microstructure portion is composed of a plurality of microstructure units. In one or more embodiments of the present disclosure, the first microstructure portion is composed of a plurality of microstructure units. The area ratio of the microstructure units of the second microstructure part in the unit area is larger than the area ratio of the microstructure units of the first microstructure part in the unit area. In one or more embodiments of the present disclosure, the backlight module further includes a light absorbing layer. The light absorption layer is arranged on one side of the light shielding sheet facing the light guide plate and is opposite to the second microstructure part in the stacking direction of the light shielding sheet and the light guide plate. In one or more embodiments of the present disclosure, the light guide plate further includes a light guide structure. The light guide structure is arranged around the single-key light guide area and is configured to guide light emitted by the light emitting unit to the light shielding sheet. In one or more embodiments of the present disclosure, each of the first microstructure portion and the light guiding structure is composed of a plurality of microstructure units. The area ratio of the microstructure units of the light guide structure in the unit area is larger than the area ratio of the microstructure units of the first microstructure part in the unit area. In one or more embodiments of the present disclosure, the backlight module further includes a reflective layer. The reflecting layer is arranged between the shading sheet and the light-emitting unit and completely covers the upper opening of the accommodating hole. In one or more embodiments of the disclosure, the reflector is disposed in an area of the circuit board not occupied by the light emitting unit and extends to an area within an inner edge of the accommodating hole. In one or more embodiments of the present disclosure, the light emitting unit includes a red light chip, a green light chip, and a blue light chip. The red light chip, the green light chip and the blue light chip are sequentially arranged along the direction. In one or more embodiments o