Backlight module and display device

Patent metadata

Field	Value
Publication number	US-10871609-B2
Application number	US-201816190483-A
Country	US
Kind code	B2
Filing date	Nov 14, 2018
Priority date	Jan 30, 2018
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A backlight module and a display device are provided. The backlight module includes a light guide plate and a light collection component. The light collection component includes a light capturing device, the light capturing device has a connection opening, and the connection opening of the light capturing device is configured to introduce the captured light into the light guide plate.

First claim

What is claimed is:

1. A backlight module, comprising a light guide plate and a light collection component, wherein the light collection component comprises a light capturing device, the light capturing device comprises a connection opening, and the connection opening of the light capturing device is configured to introduce captured light into the light guide plate;
wherein the light collection component further comprises a light conducting device, a light entrance of the light conducting device is connected to the connection opening, and a light exit of the light conducting device is connected to a light incident surface of the light guide plate;
wherein an area of the light entrance of the light conducting device is greater than an area of the connection opening;
wherein the light capturing device comprises a bottom reflection layer, a top transmission layer and an end reflection layer, a light exporting cavity is arranged between the top transmission layer and the bottom reflection layer, the connection opening is arranged at an end of the light exporting cavity, and the end reflection layer is arranged at an end of the light exporting cavity opposite to the connection opening;
wherein the light capturing device further comprises a bottom transmission layer in contact with the light exporting cavity, the bottom reflection layer is oblique relative to the bottom transmission layer, wherein
the bottom reflection layer comprises a first surface at a side of the bottom reflection layer adjacent to the bottom transmission layer, the first surface is a planar surface which is in connection with the end reflection layer and the bottom transmission layer and extends from the end reflection layer to the bottom transmission layer.

2. The backlight module according to claim 1 , wherein the top transmission layer comprises a top optically thinner medium layer and a top optically denser medium layer arranged in a stacked manner, the top optically denser medium layer is arranged between the light exporting cavity and the top optically thinner medium layer, and the bottom reflection layer is parallel to the top optically denser medium layer.

3. The backlight module according to claim 1 , wherein the bottom transmission layer is arranged between the top transmission layer and the bottom reflection layer.

4. The backlight module according to claim 3 , wherein the bottom transmission layer is parallel to the top transmission layer, an angle between the bottom reflection layer and the bottom transmission layer is equal to a critical incident angle θ, and the critical incident angle θ is a minimum incident angle of light a meeting a capturing condition and emitted to the top transmission layer from the outside,
the bottom reflection layer is configured to reflect light that does not meet the capturing condition into light meeting the capturing condition, to enable the light meeting the capturing condition to be captured by the light capturing device.

5. The backlight module according to claim 3 , wherein the top transmission layer comprises a top optically thinner medium layer and a top optically denser medium layer, the bottom transmission layer comprises a bottom optically thinner medium layer and a bottom optically denser medium layer, the light exporting cavity is arranged between the top optically denser medium layer and the bottom optically denser medium layer, the top optically denser medium layer and the bottom optically denser medium layer are both in contact with the light exporting cavity, the top optically thinner medium layer is in contact with a surface of the top optically denser medium layer away from the light exporting cavity, and the bottom optically thinner medium layer is in contact with a surface of the bottom optically denser medium layer away from the light exporting cavity, and the bottom reflection layer is opposite to a surface of the bottom optically denser medium layer away from the bottom optically denser medium layer.

6. The backlight module according to claim 3 , wherein
the bottom transmission layer is configured to totally reflect light meeting the capturing condition on a surface of the bottom transmission layer in contact with the light exporting cavity, to reflect the light meeting the capturing condition to the surface of the top transmission layer in contact with the light exporting cavity and totally reflected the light on the surface of the top transmission layer in contact with the light exporting cavity, to capture the light meeting the capturing condition, and
the bottom reflection layer is configured to reflect light that does not meet the capturing condition into light meeting the capturing condition and reflect the light meeting the capturing condition to the bottom transmission layer to enable the light to enter into the light exporting cavity.

7. The backlight module according to claim 1 , wherein
the bottom reflection layer is configured to reflect light entering the light exporting cavity to a surface of the top transmission layer in contact with the light exporting cavity,
the top transmission layer is configured to totally reflect light meeting a capturing condition on the surface of the top transmission layer in contact with the light exporting cavity to capture the light meeting the capturing condition.

8. The backlight module according to claim 1 , wherein
the light conducting device is configured to introduce the captured light into the light guide plate, to diffuse the captured light through the light guide plate.

9. A display device, comprising a backlight module and a display panel, wherein the backlight module comprises a light guide plate and a light collection component, the light collection component comprises a light capturing device, the light capturing device comprises a connection opening, and the connection opening of the light capturing device is configured to introduce the captured light into the light guide plate,
the light collection component of the backlight module is arranged at a periphery of the display panel, and a surface of the light capturing device receiving light and a display surface of the display panel are on the same plane;
wherein the light collection component further comprises a light conducting device, a light entrance of the light conducting device is connected to the connection opening, and a light exit of the light conducting device is connected to a light incident surface of the light guide plate;
wherein an area of the light entrance of the light conducting device is greater than an area of the connection opening;
wherein the light capturing device comprises a bottom reflection layer, a top transmission layer and an end reflection layer, a light exporting cavity is arranged between the top transmission layer and the bottom reflection layer, the connection opening is arranged at an end of the light exporting cavity, and the end reflection layer is arranged at an end of the light exporting cavity opposite to the connection opening;
wherein the light capturing device further comprises a bottom transmission layer in contact with the light exporting cavity, the bottom reflection layer is oblique relative to the bottom transmission layer, wherein
the bottom reflection layer comprises a first surface at a side of the bottom reflection layer adjacent to the bottom transmission layer, the first surface is a planar surface which is in connection with the end reflection layer and the bottom transmission layer and extends from the end reflection layer to the bottom transmission layer.

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Ren Jinyu
• Song Yongzhi
• Ma Jun
• Feng Sha

Classifications

• G02F1/133618

  for ambient light · CPC title

• G02B6/0045

  by shaping at least a portion of the light guide · CPC title

• G02B6/008 Primary

  of the partially overlapping type · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0088 Primary

  of the light guide or other optical sheets in the package · CPC title