Light source module

Patent metadata

Field	Value
Publication number	US-9182105-B1
Application number	US-201414332398-A
Country	US
Kind code	B1
Filing date	Jul 16, 2014
Priority date	Apr 30, 2014
Publication date	Nov 10, 2015
Grant date	Nov 10, 2015

Abstract

A light source module including an optical film and at least one light source unit is provided. The light source unit and the optical film enclose a space. The light source unit includes a reflecting device, at least one light bar, and a collimated unit. The reflecting device is disposed under the optical film. The light bar includes a plurality of light-emitting elements arranged along a third direction. The collimated unit extends along a direction parallel to the third direction and includes an upper reflective portion and a lower reflective portion. A shortest distance between one end of the lower reflective portion located adjacent to the reflecting device and the optical axis of the light-emitting elements along a second direction is defined as a first half light-emitting width, which is gradually increased along the third direction from a center portion of the collimated unit towards two sides thereof.

First claim

What is claimed is:

1. A light source module, comprising:
an optical film; and
at least one light source unit, wherein the at least one light source unit and the optical film enclose a space, and the light source unit comprises:
a reflecting device, disposed under the optical film;
at least one light bar, comprising a plurality of light-emitting elements, wherein a direction of an optical axis of the light-emitting elements is defined as a first direction, and a direction perpendicular to the first direction and perpendicular to the optical film is defined as a second direction, and the light-emitting elements are arranged along a third direction perpendicular to the first direction and perpendicular to the second direction;
a collimated unit, extending along a direction parallel to the third direction, and comprising:
an upper reflective portion, wherein one end of the upper reflective portion is located adjacent to the optical film, and the other end is located adjacent to the light-emitting elements; and
a lower reflective portion, disposed opposite to the upper reflective portion, wherein one end of the lower reflective portion is located adjacent to the reflecting device, and the other end is located adjacent to the light-emitting elements, a shortest distance between one end of the lower reflective portion located adjacent to the reflecting device and the optical axis of the light-emitting elements along the second direction is defined as a first half light-emitting width, and the first half light-emitting width is gradually increased along the third direction from a center portion of the collimated unit towards two sides thereof, wherein the light-emitting elements are located between the upper reflective portion and the lower reflective portion.

2. The light source module as claimed in claim 1 , wherein a shortest distance between one end of the upper reflective portion located adjacent to the optical film and the optical axis of the light-emitting elements along the second direction is defined as a second half light-emitting width, and the second half light-emitting width is gradually decreased along the third direction from the center portion of the collimated unit towards two sides thereof.

3. The light source module as claimed in claim 1 , wherein at least one first section line of the upper reflective portion and at least one second section line of the lower reflective portion on at least one reference plane formed by the first direction and the second direction are all aspherical curves, and the at least one first section line and the at least one second section line satisfy a following equation:

z
=

y
2

/
R

1
+

1
-

(

1
+
K

)

⁢

y
2

/

R
2

+

∑

n
=
2

10

⁢

A

2
⁢

⁢
n

⁢

y

2
⁢

⁢
n

where, a z-direction is the first direction, a y-direction is the second direction, K is a conic constant, R is a radius of curvature, A 2n is a coefficient of y 2n , n is a positive integer greater than or equal to 2 and smaller than or equal to 10, and R is a constant greater than 0.

4. The light source module as claimed in claim 3 , wherein a value of K in the equation ranges from −1 to −10, a value of quartic component coefficient A 4 ranges from 0 to 0.1, the quartic component coefficient A 4 is not 0 when K=−1, and K is not equal to −1 when the quartic component coefficient A 4 =0.

5. The light source module as claimed in claim 3 , wherein the number of the reference planes is plural, the number of the first section lines is plural and the first section lines all satisfy the equation, and at least one of the value of K and the value of A 4 of one of the first section lines is different from the value of K or the value of A 4 of another first section line.

6. The light source module as claimed in claim 5 , wherein the values of K of the first section lines close to the center portion of the collimated unit are smaller than the values of K of the first section lines close to the two sides of the collimated unit, or the values of A 4 of the first section lines close to the center portion of the collimated unit are smaller than the values of A 4 of the first section lines close to the two sides of the collimated unit.

7. The light source module as claimed in claim 3 , wherein the number of the reference planes is plural, the number of the second section lines is plural and the second section lines all satisfy the equation, and at least one of the value of K and the value of A 4 of one of the second section lines is different from the value of K or the value of A 4 of another second section line.

8. The light source module as claimed in claim 7 , wherein the values of K of the second section lines close to the center portion of the collimated unit are greater than the values of K of the second section lines close to the two sides of the collimated unit, or the values of A 4 of the second section lines close to the center portion of the collimated unit are greater than the values of A 4 of the second section lines close to the two sides of the collimated unit.

9. The light source module as claimed in claim 1 , wherein each two of the adjacent light-emitting elements have a pitch there between, and at least a part of the pitches are different.

10. The light source module as claimed in claim 9 , wherein the pitches located adjacent to the center portion of the collimated unit are smaller than the pitches located adjacent to the two sides of the collimated unit.

11. The light source module as claimed in claim 1 , wherein pitches between

Assignees

• Liu Hung-Wei
• Liu Chin-Ku
• Young Lighting Technology Inc

Inventors

• Liu Hung-Wei
• Liu Chin-Ku

Classifications

• G09G3/3413

  Details of control of colour illumination sources · CPC title

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G02B6/0096

  the lights guides being of the hollow type · CPC title