CN-114895495-B - Side-in type backlight module and display device

CN114895495BCN 114895495 BCN114895495 BCN 114895495BCN-114895495-B

Abstract

The application provides a side-in backlight module and a display device, wherein the side-in backlight module comprises a light source assembly, a light guide film and a reflecting sheet, the light source assembly comprises a substrate, a light emitting unit and a photomask, the light emitting unit is arranged on the substrate, the light emitting surface of the light emitting unit is concave, the photomask is connected with the substrate, the photomask is provided with a containing cavity, a first opening and a second opening communicated with the containing cavity, the light guide film is provided with a first side surface, a second side surface opposite to the first side surface and a third side surface connected with the first side surface and the second side surface, the first side surface is provided with a plurality of protrusions, the second side surface is provided with a plurality of prismatic grooves, the reflecting sheet is arranged below the second side surface, and light emitted by the light emitting unit enters the light guide film through the third side surface after being reflected on the inside of the photomask, is reflected to the first side surface through the groove wall of the prismatic grooves and the reflecting sheet, and finally is converged by the plurality of protrusions. The side-entrance type backlight module can generate uniform and high-brightness light rays.

Inventors

DENG TIANYING
LI JIANLIN
Zeng hang

Assignees

惠州视维新技术有限公司

Dates

Publication Date: 20260512
Application Date: 20220530

Claims (7)

1. A side-entry backlight module, comprising: the light source assembly comprises a substrate, a light emitting unit and a photomask, wherein the light emitting unit is arranged on the substrate, the light emitting surface of the light emitting unit is a concave surface, the photomask is connected with the substrate and is provided with a containing cavity, a first opening and a second opening, the first opening is communicated with the containing cavity, and the photomask is covered on the light emitting unit through the first opening; The light guide film is clamped in the second opening, the light guide film is provided with a first side face, a second side face opposite to the first side face and a third side face connected with the first side face and the second side face, the first side face is provided with a plurality of protrusions, the size or distribution density of the protrusions gradually increases along the direction of approaching the light source assembly to be far away from the light source assembly, the second side face is provided with a plurality of prism grooves, the size or distribution density of the prism grooves gradually increases along the direction of approaching the light source assembly to be far away from the light source assembly, the second side face is provided with a plurality of prisms, the prisms adjacent to the light guide film form the prism grooves, the prisms are provided with a plurality of planes, and each plane reflects light rays; The reflecting sheet is arranged below the second side surface; the light shield is spherical, the inside of the light shield is a neutral and uniform diffuse reflection surface, and the diffuse reflection surface has the same diffuse reflectance to the light rays with various wavelengths; After being reflected on the inner wall of the photomask, the light rays emitted by the light emitting unit enter the light guide film through the third side face, are reflected to the first side face through the groove wall of the prismatic groove and the reflecting sheet, and are finally converged by the protrusions.
2. The side-entry backlight module of claim 1, wherein the plurality of protrusions are arranged in an array.
3. A side entry backlight module according to claim 1 or 2, wherein the protrusions are hemispherical or pyramidal in shape.
4. The side-entry backlight module according to claim 1 or 2, further comprising a first substrate, wherein the first substrate is disposed on the first side surface, a plurality of first microprisms are disposed on a side of the first substrate away from the light guiding film, and extension directions of the plurality of first microprisms are all parallel to the first direction.
5. The side-entry backlight module of claim 4, further comprising a second substrate disposed on a side of the first substrate away from the light guiding film, wherein a plurality of second microprisms are disposed on a side of the second substrate away from the light guiding film, wherein the extending directions of the plurality of second microprisms are all parallel to a second direction, and the first direction intersects the second direction.
6. The side-entry backlight module according to claim 1 or 2, wherein the number of the light emitting units is n, the m light emitting units are light emitting sets, the light emitting sets are sequentially arranged along the length direction of the substrate, the m light emitting units in each light emitting set are sequentially arranged along the length direction perpendicular to the substrate, n is greater than or equal to m, the number of the light masks is multiple, the light masks are in one-to-one correspondence with the light emitting sets, and each light mask is arranged on one light emitting set.
7. A display device comprising the side-entry backlight module of any one of claims 1 to 6.

Description

Side-in type backlight module and display device Technical Field The invention relates to the technical field of display, in particular to a side-in backlight module and a display device. Background Liquid Crystal Display (LCD) devices have advantages of small size, light weight, power saving, and low radiation, and thus are widely used in various electronic products such as notebook computers, digital camcorders, mobile phones, computer screens, and Liquid crystal televisions. Since the lcd device is not a self-luminous display device, the backlight module must be used to provide a uniform and high-brightness light source to the lcd module. In the related art, the backlight module is mainly formed by using a light emitting component and a light guide plate, wherein the light guide plate is printed with light guide points by using laser engraving, V-shaped cross grid engraving and UV screen printing technologies on a plate. When the light emitted by the light emitting component is reflected on each light guide point, emitted light is generated, and the reflected light is diffused towards each angle, so that the liquid crystal module is lightened. Therefore, the light guide plate is prepared by adopting a process combining a spectrum analysis principle and a printing technology, and has higher cost and complex process. When the light guide plate is applied to the side-in type backlight module, the light emitting component is located at one side of the light guide plate, and the liquid crystal module is located at the adjacent side of the light guide plate, so that the light intensity of the light guide plate far away from the light emitting component is lower, and the uneven light and the low brightness are caused for the liquid crystal module. Disclosure of Invention The embodiment of the application provides a side-entering type backlight module and a display device, wherein the side-entering type backlight module can generate uniform and high-brightness light rays. The embodiment of the application provides a side-in type backlight module, which comprises: the light source assembly comprises a substrate, a light emitting unit and a photomask, wherein the light emitting unit is arranged on the substrate, the light emitting surface of the light emitting unit is a concave surface, the photomask is connected with the substrate and is provided with a containing cavity, a first opening and a second opening, the first opening is communicated with the containing cavity, and the photomask is covered on the light emitting unit through the first opening; The light guide film is clamped in the second opening, the light guide film is provided with a first side face, a second side face opposite to the first side face and a third side face connected with the first side face and the second side face, the first side face is provided with a plurality of protrusions, the second side face is provided with a plurality of prismatic grooves, and the size or the distribution density of the prismatic grooves gradually increases along the direction of approaching to the light source assembly to the direction of keeping away from the light source assembly; The reflecting sheet is arranged below the second side surface; After being reflected on the inner wall of the photomask, the light rays emitted by the light emitting unit enter the light guide film through the third side face, are reflected to the first side face through the groove wall of the prismatic groove and the reflecting sheet, and are finally converged by the protrusions. In some embodiments, the plurality of protrusions are arranged in an array. In some embodiments, the plurality of protrusions increases in size or distribution density in a direction toward the light source assembly and away from the light source assembly. In some embodiments, the protrusions are hemispherical or pyramidal in shape. In some embodiments, the light directing film has a thickness of 0.3 millimeters to 1 millimeter. In some embodiments, the mask is spherical. In some embodiments, the side-in backlight module further includes a first substrate, the first substrate is disposed on the first side, a plurality of first microprisms are disposed on a side of the first substrate away from the light guiding film, and extension directions of the plurality of first microprisms are all parallel to the first direction. In some embodiments, the side-entry backlight module further includes a second substrate, the second substrate is disposed on a side of the first substrate away from the light guiding film, a plurality of second microprisms are disposed on a side of the second substrate away from the light guiding film, extension directions of the plurality of second microprisms are all parallel to a second direction, and the first direction intersects the second direction. In some embodiments, the number of the light emitting units is n, the m light emitting units are one light emitting set, the light e