TWI464503B - Backlight module - Google Patents

Description

Backlight module

The present invention relates to a backlight module, and more particularly to a backlight module having a light conversion element.

A quantum dot is a nano crystal having a diameter equal to or less than about 10 nanometers (nm), which is a semiconductor material composition and causes a quantum confinement effect. Compared to typical phosphors, quantum dots produce denser light in narrower wavelength bands. Since the wavelength of light varies according to the size of the quantum dot, light having a desired wavelength region can be obtained by controlling the size of the quantum dot.

By sealing the quantum dots in a glass tube (or other package structure) and using a glass tube sealed with quantum dots as a light conversion element of the backlight module in the display device, that is, the light conversion element is disposed on Between the light guide plate of the backlight module and the light emitting unit. The main function of the light conversion element is to convert the light of a specific illuminating color (for example, blue) emitted by the illuminating unit into white light, enter the light guide plate, and finally provide the backlight to the display panel.

However, when a glass tube having a quantum dot is used in a large-sized display device, since the length of the glass tube is insufficient, it is usually necessary to connect a plurality of glass tubes in series to meet the demand. Due to the limitation of the process, the quantum dots cannot be distributed at the end of the glass tube, so that the end of the glass tube is an ineffective area where light conversion cannot be performed. When the light emitted by the light-emitting unit with a specific illuminating color passes through the invalid area, it cannot be converted. The white light causes the light of a specific illuminating color to leak out in this ineffective area. In addition, when a plurality of glass tubes are connected in series, there will be a gap between adjacent glass tubes, which will result in The ineffective area of the glass tube becomes larger, so that the light leakage of the specific illuminating color is more serious.

One of the objects of the present invention is to provide a backlight module for preventing light leakage of a light-emitting element of a specific illuminating color, thereby increasing the light conversion efficiency of the light converting element.

It is still another object of the present invention to provide a display device for preventing light leakage of a light-emitting element of a specific luminescent color, thereby increasing the light conversion efficiency of the light conversion element.

To achieve the above advantages, the present invention provides a backlight module including a light guide plate, a light emitting unit, and at least one light converting element. The light guide plate has a light incident surface. The light emitting unit is disposed relative to the light incident surface of the light guide plate. The light emitting unit includes at least one first light emitting element and at least one second light emitting element, and the first light emitting element and the at least one second light emitting element have different light emitting colors. The light conversion element is disposed between the light incident surface of the light guide plate and the light emitting unit. The light conversion element includes a light conversion region and a light transmission region. The first light-emitting element of the light-emitting unit corresponds to the light-converting region, and the second light-emitting element corresponds to the light-transmitting region.

In an embodiment of the invention, the number of the at least one light conversion element is linear and arranged in a plurality, and the adjacent two light conversion elements have spacing between the light conversion elements, and the light penetration area includes the interval. .

In an embodiment of the invention, the interval corresponds to the second illuminating element.

In an embodiment of the invention, the light conversion element includes a light conversion portion and an end portion, and the light conversion region includes a light conversion portion, and the light transmission region includes an end portion.

In an embodiment of the invention, the end portion corresponds to the second illuminating element Pieces.

In an embodiment of the invention, the first light emitting element of the light emitting unit comprises a blue light emitting element or an ultraviolet light emitting element, and the second light emitting element comprises a white light emitting element.

In an embodiment of the invention, the light emitting unit further includes a circuit board, and the first light emitting element and the second light emitting element are disposed on the circuit board.

In an embodiment of the invention, the light conversion element comprises a package member and a plurality of quantum dots encapsulated in the package member.

In an embodiment of the invention, the illuminating color of the first illuminating element converted by the optical converting element is substantially the same as the illuminating color of the second illuminating element.

Another aspect of the present invention provides a display device including a display panel and a backlight module. The backlight module is disposed relative to the display panel, and the backlight module includes a light guide plate, a light emitting unit, and at least one light converting component. The light guide plate has a light incident surface. The light emitting unit is disposed relative to the light incident surface of the light guide plate. The light emitting unit includes at least one first light emitting element and at least one second light emitting element. The first light emitting element is different from the light emitting color of the at least one second light emitting element. The light conversion element is disposed between the light incident surface of the light guide plate and the light emitting unit. The light conversion element includes a light conversion region and a light transmission region. The first light-emitting element of the light-emitting unit corresponds to the light-converting region, and the second light-emitting element corresponds to the light-transmitting region.

In an embodiment of the invention, the light emitting unit includes a first light emitting element and a second light emitting element having different light emitting colors, and the light converting element includes a light converting region and a light transmitting region, and the first light emitting element is disposed to correspond to the light converting The position of the area and the second light-emitting element are disposed at a position corresponding to the light-transmitting area. By the structural design of the backlight module, the light-emitting element of the specific light-emitting color can be effectively prevented from leaking, and the light-guide plate is ensured. The illuminating colors of the light that is mixed in the light are all the same color.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Please refer to FIG. 1 , which is a cross-sectional view of a display device according to an embodiment of the invention. As shown in FIG. 1 , the display device 1 of the embodiment includes a backlight module 10 and a display panel 11 . The display panel 11 is disposed relative to the backlight module 10. The backlight module 10 includes a light guide plate 101, a light emitting unit 102, at least one light conversion element 103, and a back plate 104. The light guide plate 101, the light emitting unit 102, and the light conversion element 103 are all disposed inside the back plate 104. The light guide plate 101 has a light incident surface 100. The light-emitting unit 102 is disposed relative to the light-incident surface 100 of the light guide plate 101, and the light-converting element 103 is disposed between the light-incident surface 100 of the light guide plate 101 and the light-emitting unit 102.

Please refer to FIG. 2 , which is a cross-sectional view of the AA line segment shown in FIG. 1 . As shown in FIG. 2, the light emitting unit 102 of the present embodiment includes at least a first light emitting element 1021, at least a second light emitting element 1022, and a circuit board 1023. The first light emitting element 1021 and the second light emitting element 1022 are disposed on the circuit board 1023. on. In addition, the illuminating color of the first illuminating element 1021 of the illuminating unit 102 is different from the illuminating color of the at least one second illuminating element 1022. For example, the first illuminating element 1021 is, for example, a blue illuminating element or an ultraviolet illuminating element, and the second The light-emitting element 1022 is, for example, a white light-emitting element, but the invention is not limited thereto.

As described above, as shown in FIG. 2, the light conversion element 103 of the present embodiment includes the light conversion region 1031 and the light transmission region 1032, and the first light emitting element 1021 of the light emitting unit 102 corresponds to the light conversion of the light conversion element 103. The region 1031, the second light emitting element 1022 of the light emitting unit 102 corresponds to the light penetrating region 1032 of the light converting element 103. Specifically, the optical conversion element described in this embodiment The member 103 includes a light converting portion 1033 and an end portion 1034, wherein the light converting region 1031 of the light converting element 103 includes a light converting portion 1033, and the light transmitting region 1032 of the light converting member 103 includes an end portion 1034. The light conversion portion 1033 of the light conversion element 103 corresponds to the first light emitting element 1021 of the light emitting unit 102, and the end portion 1034 of the light conversion element 103 corresponds to the second light emitting element 1022 of the light emitting unit 102.

As described above, as shown in FIG. 2, the number of the light conversion elements 103 described in the present embodiment is, for example, a plurality of and linearly arranged. As shown in FIG. 2, these light conversion elements 103 are disposed, for example, along the BB line segment. It is worth mentioning that the adjacent two light conversion elements 103 of the light conversion elements 103 have a space 1035 therebetween, that is, the interval 1035 is located between the ends 1034 of the adjacent two light conversion elements 103. . The interval 1035 is located in the same manner as the end portion 1034 of the light converting element 103 in the range of the light transmitting region 1032 of the light converting element 103, and the second light emitting element 1022 of the light emitting unit 102 corresponds to the interval 1033, that is, when After the light emitted by the second light-emitting element 1022 passes through the end portion 1034 and the gap 1035 of the light-converting element 103, the light-emitting color of the light emitted by the second light-emitting element 1022 does not change and directly reaches the light-incident surface 100 of the light guide plate 101.

For example, the illuminating color of the first illuminating element 1021 of the illuminating unit 102 of the present embodiment is, for example, blue, and the illuminating color of the second illuminating element 1022 is, for example, white. When the light emitted from the first light-emitting element 1021 passes through the light conversion portion 1033 (light conversion region 1031) of the light conversion element 103, the light emission color of the light emitted from the first light-emitting element 1021 is converted into white by blue. When the light emitted by the second illuminating element 102 passes through the interval 1035 between the end 1034 of the light converting element 103 and the adjacent two light converting elements 103, the illuminating color of the light emitted by the second illuminating element 1022 is still white. . That is to say, the illuminating color of the first illuminating element 1021 of the illuminating unit 102 after being converted by the optical converting element is substantially the same as the illuminating color of the second illuminating element 1022. In such a structural design In the following, it is possible to ensure that the illuminating colors of the light entering the light guide plate 101 for mixing light are the same color (for example, white).

It is to be noted that, in this embodiment, the number of the second illuminating members 1022 located in the light transmitting region 1032 is two. As shown in FIG. 2, the second illuminating members 1022 are respectively located in the light converting member 103. Directly below the end portion 1034, the number of the second light-emitting elements 1022 located in the light-transmitting region 1032 and the relative positions of the second light-emitting elements 1022 and the ends of the light-converting elements 103 are only one embodiment of the present invention. The invention is not limited thereto. In other embodiments, as shown in FIG. 3, the number of second light-emitting elements 1022 located in the light-transmitting region 1032 is one, and the second light-emitting element 1022 is located between the adjacent two light-converting elements 103. Immediately below the interval 1035, the number of the second light-emitting elements 1022 located in the light-transmitting region 1032 and the relative position between the second light-emitting element 1022 and the light-converting element 103 as shown in FIG. 3 can also be ensured to enter. The illuminating colors of the light beams that are mixed in the light guide plate 101 are all of the same color.

Please refer to FIG. 4 , which is a schematic structural view of the light conversion element shown in FIGS. 1 to 3 . As shown in FIG. 4, the light conversion element 103 of the present embodiment includes a package member 1036 and a plurality of quantum dots 1037 encapsulated in the package member 1036. The quantum dots 1037 are distributed in the light conversion portion 1033 of the light conversion element 103. Due to the limitations in the process, the distribution of these quantum dots 1037 is not present at the end 1034 of the light converting element 103. The material of the package member 1036 of the light conversion element 103 includes a polymer or glass, but the invention is not limited thereto. As shown in FIG. 4, the shape of the package member 1036 of the light conversion element 103 is, for example, a strip shape. However, the present invention is not limited thereto, and the shape of the package member 1036 may be a flat shape or other shapes. In addition, the plurality of quantum dots 1037 encapsulated in the package member 1036 can also be replaced by phosphor powder according to actual needs, but the present invention does not Limited.

In summary, in an embodiment of the present invention, the light emitting unit includes a first light emitting element and a second light emitting element having different light emitting colors, and the light converting element includes a light converting region and a light transmitting region, and the first light emitting component is disposed. The position corresponding to the light conversion region and the second light emitting element are disposed at a position corresponding to the light penetrating region, and the structure design of the backlight module can effectively prevent light leakage of the light emitting component of the specific light emitting color. Make sure that the light that enters the light guide to mix light is the same color.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

1‧‧‧ display device

10‧‧‧Backlight module

11‧‧‧ display panel

100‧‧‧Into the glossy

101‧‧‧Light guide plate

102‧‧‧Lighting unit

103‧‧‧Light conversion components

104‧‧‧ Backplane

1021‧‧‧First light-emitting element

1022‧‧‧Second light-emitting element

1023‧‧‧Circuit board

1031‧‧‧Light conversion area

1032‧‧‧Light penetration area

1033‧‧‧Light Conversion Department

1034‧‧‧End

1035‧‧‧ interval

1036‧‧‧Package

1037‧‧‧ Quantum dots

AA, BB‧‧ ‧ line segments

1 is a cross-sectional view of a display device according to an embodiment of the invention.

2 is a cross-sectional view of the AA line segment shown in FIG. 1.

3 is a cross-sectional view showing a display device according to another embodiment of the present invention.

4 is a schematic structural view of the light conversion element shown in FIGS. 1 and 2.

100‧‧‧Into the glossy

101‧‧‧Light guide plate

102‧‧‧Lighting unit

103‧‧‧Light conversion components

104‧‧‧ Backplane

1021‧‧‧First light-emitting element

1022‧‧‧Second light-emitting element

1023‧‧‧Circuit board

1031‧‧‧Light conversion area

1032‧‧‧Light penetration area

1033‧‧‧Light Conversion Department

1034‧‧‧End

1035‧‧‧ interval

BB‧‧ ‧ line segment

Claims (7)

A backlight module includes: a light guide plate having a light incident surface; an illumination unit disposed opposite to the light incident surface of the light guide plate, the light emitting unit including at least one first light emitting element and at least one second light emitting element The first light-emitting element is different from the light-emitting color of the at least one second light-emitting element, and the at least one light-converting element is disposed between the light-incident surface of the light guide plate and the light-emitting unit, and the light-converting element includes a light conversion And a light-transmitting region, the first light-emitting element of the light-emitting unit corresponds to the light-converting region, and the second light-emitting component corresponds to the light-transmitting region, wherein the number of the at least one light-converting element is plural Between the adjacent two light conversion elements of the light conversion element, there is a space between the two light conversion elements, the light conversion element includes a light conversion portion and an end portion, the light conversion region includes the light conversion portion, the light penetration region includes the interval and the At the end, the second illuminating element corresponds to the spacing or the end. The backlight module of claim 1, wherein the at least one light conversion element is linearly arranged. The backlight module of claim 1, wherein the first light-emitting element of the light-emitting unit comprises a blue light-emitting element or an ultraviolet light-emitting element, and the second light-emitting element comprises a white light-emitting element. The backlight module of claim 1, wherein the light emitting unit further comprises a circuit board, and the first light emitting element and the second light emitting element are disposed on the circuit board. The backlight module of claim 1, wherein the light conversion element comprises a package member and a plurality of quantum dots encapsulated in the package member. The backlight module of claim 1, wherein the illuminating color of the first illuminating element after being converted by the optical converting element is substantially the same as the illuminating color of the second illuminating element. A display device includes: a display panel; and a backlight module disposed relative to the display panel, the backlight module includes: a light guide plate having a light incident surface; and a light emitting unit opposite to the light guide plate The light-emitting unit includes at least one first light-emitting element and at least one second light-emitting element, wherein the first light-emitting element is different from the light-emitting color of the at least one second light-emitting element, and at least one light-converting element is disposed on the light-emitting element Between the light incident surface of the light guide plate and the light emitting unit, the light conversion element includes a light conversion region and a light transmission region, and the first light emitting component of the light emitting unit corresponds to the light conversion region, and the second light emitting component Corresponding to the light-transmitting region, wherein the number of the at least one light-converting element is plural, and the adjacent two light-converting elements of the light-converting elements have a space therebetween, the light-converting element includes a light converting portion and one end And the light conversion region includes the light conversion portion, the light transmission region includes the interval and the end portion, and the second light emitting element corresponds to the interval or the end portion.