Backlight module and light guide plate thereof

Abstract

The invention relates to a backlight module and a light guide plate thereof. The backlight module comprises a light source unit, a light guide plate and an optical layer arranged on one side of the light guide plate. The light guide plate comprises a plate body provided with a light inlet face and at least one opening formed in the plate body. The plate body extends along the X-Y-axis plane, and a Z axis exists in the normal direction of the X-Y-axis plane. Light enters the light guide plate through the light inlet face and then moves forwards along the X-Y-axis plane. The opening extends into the plate body or even penetrates through the plate body along the Z-axis, and the projection of the opening on the X-Y-axis plane is a gradually-shrunk profile. The gradually-shrunk profile comprises a base area and an angular extending area. The angular extending area extends from the one end of the base area in an angular shape and is closer to the light source unit than the base area. The optical layer is provided with a through hole opposite to the base area, and at least part of the projection of the angular extending area on the optical layer is located outside the through hole. According to the backlight module and the light guide plate thereof, by means of the design of the opening which is parallel to a light outlet face and provided with the gradually-shrunk profile, the light leakage phenomenon of the opening can be relieved, and the brightness of a keyboard is more even.

Description

technical field [0001] The invention relates to a backlight module and a light guide plate thereof, in particular to a backlight module and a light guide plate which are suitable for notebook computer keyboards and can reduce light leakage at openings. Background technique [0002] With the evolution of technology and the improvement of specifications of notebook computers, luminous keyboards have gradually become the mainstream input devices of notebook computers. Illuminated keyboards are usually composed of an upper key module and a lower backlight module. Luminous brightness remains uniform. [0003] However, in order to (1) allow the air to flow from the bottom of the backlight module to the top of the backlight module more smoothly, and prevent the backlight module from hindering the heat dissipation of notebook computer heat sources (such as microprocessors, north-south bridge chipsets, and display acceleration chips) , (2) through a plurality of screws that run thr...

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