Light source module, backlight module and display device

Patent metadata

Field	Value
Publication number	US-2021263380-A1
Application number	US-202117234821-A
Country	US
Kind code	A1
Filing date	Apr 20, 2021
Priority date	Dec 20, 2019
Publication date	Aug 26, 2021
Grant date	—

Abstract

A light source module includes a back plate and light-emitting units. The back plate includes a bottom plate and a sidewall. An included angle is formed between an outer side surface of the sidewall and a horizontal plane where the bottom plate is located, and the included angle is an acute angle. An optical distance is defined between a top end of the sidewall and the horizontal plane. The light-emitting units are arranged in the back plate. The light-emitting units which are closest to the sidewall are defined as target light-emitting units, and each of the target light-emitting units has a radiation angle, and each of the target light-emitting units is separated from the sidewall by a distance. The first horizontal distance is determined by a tangent function of a complementary angle of the radiation angle, the second horizontal distance is determined by a tangent function of the included angle.

First claim

What is claimed is:

1 . A light source module, comprising:
a back plate, comprising a bottom plate and a sidewall standing on the bottom plate, wherein an included angle (θ slope ) is formed between an outer side surface of the sidewall and a horizontal plane where the bottom plate is located, and the included angle is an acute angle, and an optical distance (OD) is defined between a top end of the sidewall and the horizontal plane; a plurality of light-emitting units arranged in the back plate, wherein the light-emitting units which are closest to the sidewall are defined as a plurality of target light-emitting units, and each of the target light-emitting units has a radiation angle (θ LED ), and each of the target light-emitting units is separated from the sidewall by a distance (d); wherein the distance (d) is a difference between a first horizontal distance and a second horizontal distance, and the first horizontal distance is formed between each of the target light-emitting units and a predetermined location of the sidewall, and the second horizontal distance is formed between a bottom edge of the sidewall and the predetermined location of the sidewall; wherein the first horizontal distance is calculated according to a first function F1, and the first function F1 is determined by a tangent function of a complementary angle of the radiation angle (θ LED ), the second horizontal distance is calculated according to a second function F2, and the second function F2 is determined by a tangent function of the included angle (θ slope ).

2 . The light source module of claim 1 , wherein the radiation angle (θ LED ) is a half viewing angle or a half light-intensity angle of each of the target light-emitting units, and light emitted by each of the target light-emitting units at the radiation angle (θ BLED ) is directed to the predetermined location of the sidewall.

3 . The light source module of claim 1 , wherein a portion of a surface of the sidewall which ranges from the predetermined location to a top edge of the sidewall can reflect more than 50% of light generated by each of the target light-emitting units.

4 . The light source module of claim 1 , wherein
the predetermined location is a midpoint of the sidewall or a position lower than the midpoint of the sidewall to which the light emitted by each of the target light-emitting units at half viewing angle or a half light-intensity angle is able to reach.

5 . The light source module of claim 1 , wherein
the first function F1 is defined by the following equation:

F
⁢

⁢
1

=

P
·

(

1

tan
⁡

(

90
⁢
°

-

θ
LED

)

)

;

the second function F2 is defined by the following equation:

F
⁢

⁢
2

=

P
·

(

1

tan
⁡

(

θ
slope

)

)

;

wherein “P” represents a vertical distance between the horizontal plane and the predetermined location on the sidewall.

6 . The light source module of claim 1 , wherein a vertical distance P between the horizontal plane and the predetermined location on the sidewall is greater than or equal to 20% of the optical distance (OD) and is smaller than or equal to 50% of the optical distance (OD).

7 . The light source module of claim 1 , wherein the relationship between the included angle (θ slope ) and the radiation angle (θ LED ) is defined by an inequality: (90−θ LED )≤θ slope ≤90.

8 . The light source module of claim 1 , wherein the relationship between the included angle (θ slope ) and the radiation angle (θ LED ) is defined by an equation:

θ
slope

=

(

180
⁢
°

-

θ
LED

)

2

.

9 . The light source module of claim 1 , wherein
a distance (D) is calculated by subtracting a third horizontal distance from the difference between the first horizontal distance and the second horizontal distance; and the third horizontal distance is a distance between a center and an edge of each of the target light-emitting units, wherein the third horizontal distance is calculated according to a third function F3, and the third function F3 is determined by a tangent function of a complementary angle of the radiation angle (θ LED ).

10 . The light source module of claim 9 , wherein
the first function F3 is defined by the following equation:

F
⁢

⁢
3

=

H

tan
⁡

(

90
⁢
°

-

θ
LED

)

;

Assignees

• Radiant Opto Electronics Suzhou Co Ltd
• Radiant Opto Electronics Corp

Inventors

• Chen chang-yao
• Chang Chih-Chiang
• Tsai Ya-Yin

Classifications

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F1/133605

  including specially adapted reflectors · CPC title

• G02B6/00

  Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings · CPC title

• G02F1/133608 Primary

  including particular frames or supporting means · CPC title