WO2019000783A1

WO2019000783A1 - Led, backlight module, and liquid crystal display device

Info

Publication number: WO2019000783A1
Application number: PCT/CN2017/110183
Authority: WO
Inventors: 邓天应; 强科文
Original assignee: 深圳Tcl新技术有限公司
Priority date: 2017-06-27
Filing date: 2017-11-09
Publication date: 2019-01-03
Also published as: CN107180908B; CN107180908A

Abstract

An LED, a backlight module, and a liquid crystal display device. The LED (100) comprises a support frame (1), a light-emitting chip (2), and a light conversion layer, where the support frame is provided with an upwardly opened cavity, the light-emitting chip is arranged within the cavity of the support frame and is mounted at the bottom wall of the support frame, the wavelength of a light emitted by the light-emitting chip is shorter than that of blue light, the light conversion layer is packaged within the cavity of the support frame, the light conversion layer comprises quantum particles and a packaging adhesive layer (6), the quantum particles comprise red quantum particles (3), green quantum particles (4), and blue quantum particles (5), and the packaging adhesive layer is provided as packaging the red quantum particles, the green quantum particles, and the blue quantum particles. By activating the red, green, and blue quantum particles with the light of which the wavelength is shorter than that of the blue light, the backlight module comprising the LED and the liquid crystal display device are allowed to achieve high color gamut effects and, at the same time, the light conversion efficiency of the quantum particles is increased.

Description

LED, backlight module and liquid crystal display device

Technical field

The present invention relates to the field of liquid crystal display technology, and in particular, to an LED, a backlight module, and a liquid crystal display device.

Background technique

Applying quantum dot particles to the backlight module can make the liquid crystal display device have high color gamut and high brightness, and the color reproduction degree is higher. At present, there are two main ways to apply quantum dot microparticles to a backlight module to achieve high color gamut. One is to make quantum dot microparticles into quantum dot optical films, and the other is to make quantum dot microparticles into quantum dot tubes, and then The quantum dot film or quantum dot tube is placed in the backlight module. However, the two implementations have complicated processes and low light conversion efficiency, and because these two methods require a large number of quantum dot particles, the production cost is high, and it is difficult to achieve large-scale industrialization.

Summary of the invention

The main object of the present invention is to provide an LED, a backlight module and a liquid crystal display device, which aim to simplify the implementation of the backlight module to achieve a high color gamut and reduce the cost.

To achieve the above object, an LED proposed by the present invention includes:

a bracket having a cavity that opens upward;

a light emitting chip, located in a cavity of the bracket, and mounted on a bottom wall of the bracket, the light emitting chip emitting light having a shorter wavelength than blue light;

a light conversion layer encapsulated in a cavity of the holder, the light conversion layer comprising quantum particles and an encapsulant layer, the quantum particles including red quantum particles, green quantum particles and blue quantum particles, the encapsulation layer wrapped The red quantum particles, the green quantum particles, and the blue quantum particles are disposed.

Preferably, each of the quantum particles has a chemical bond barrier layer on the outside, and the encapsulant layer is a silicone-based encapsulant; or

Each of the quantum particles has no chemical bond barrier layer outside, and the encapsulant layer is a water oxygen barrier encapsulant, and the water oxygen barrier encapsulant encapsulates the quantum particles to form a water oxygen barrier layer.

Preferably, the red quantum particles, the green quantum particles, and the blue quantum particles are layered in the up and down direction to form a red quantum layer, a green quantum layer, and a blue quantum layer; or

The red quantum particles, the green quantum particles, and the blue quantum particles are layered in an up and down direction to form a single quantum layer and a mixed quantum layer, the single quantum layer being composed of the red quantum particles, One of the green quantum particles and the blue quantum particles, the mixed quantum layer being composed of the remaining two of the red quantum particles, the green quantum particles, and the blue quantum particles.

Preferably, the distance between the red quantum layer, the green quantum layer and the blue quantum layer and the light emitting chip is set from near to far.

Preferably, the light-emitting chip is a high-energy light source light-emitting chip whose wavelength is smaller than blue light and whose light energy is stronger than blue light.

Preferably, the mass ratio of the red quantum particles, the green quantum particles and the blue quantum particles is 1:2:1 to 1:4:3.

Preferably, the quantum particles are quantum dots and quantum rods.

Preferably, the quantum particles are CsPbX3 (X=Cl, Br, I), CdSe, CdTe, MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe ZnTe At least one of CdS, GaN, GaP, GaAs, InN, InP, and InAs.

The invention also provides a backlight module, the backlight module comprising an LED, the LED comprising:

a bracket having a cavity that opens upward;

The present invention also provides a liquid crystal display device, the liquid crystal display device includes a backlight module, and the backlight module includes an LED, and the LED includes:

a bracket having a cavity that opens upward;

Preferably, the distance between the red quantum layer, the green quantum layer and the blue quantum layer and the light emitting chip is set from near to far. Preferably, the light-emitting chip is a high-energy light source light-emitting chip whose wavelength is smaller than blue light and whose light energy is stronger than blue light.

Preferably, the quantum particles are quantum dots and quantum rods.

In the technical solution of the present invention, the light-emitting chip and the red quantum particles, the green quantum particles and the blue quantum particles are encapsulated inside the LED, wherein the light emitted by the light-emitting chip has a shorter wavelength than the blue light wavelength, and the light emitted by the light-emitting chip excites red, The green and blue three-color quantum particles enable the backlight module and the liquid crystal display device including the LED to achieve a high color gamut effect, and also improve the light conversion efficiency of the quantum particles.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain other drawings according to the structures shown in the drawings without any creative work.

1 is a schematic structural view of an embodiment of an LED provided by the present invention;

Figure 2 is a partial enlarged view of a portion A in Figure 1;

FIG. 3 is a schematic structural view of another embodiment of an LED provided by the present invention.

Description of the reference numerals:

标号Label	名称name	标号Label	名称name
100100	LEDled	55	蓝色量子微粒Blue quantum particles
11	支架support	66	封装胶层Encapsulation layer
22	发光芯片Light emitting chip	77	化学键阻隔层Chemical bond barrier
33	红色量子微粒Red quantum particles	88	金线Gold Line
44	绿色量子微粒Green quantum particles

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back, ...) in the embodiment of the present invention, the directional indication is only used to explain in a certain posture (as shown in the figure). The relative positional relationship between the components, the motion situation, and the like, if the specific posture changes, the directional indication also changes accordingly.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of the "first", "second", etc. is used for the purpose of description only, and is not to be construed as an Its relative importance or implicit indication of the number of technical features indicated. Thus, features defining "first" and "second" may include at least one of the features, either explicitly or implicitly. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.

At present, there are two main ways to apply quantum dot particles to a backlight module to achieve high color gamut. One is to make quantum dot particles into quantum dot optical films, and the other is to make quantum dot particles into quantum dot tubes. The quantum dot film or quantum dot tube is placed in the backlight module. However, the two implementations have complicated processes, low light conversion efficiency, and high cost. In order to simplify the process and reduce the cost, the present invention provides an LED, a backlight module and a liquid crystal display device, which realize a high color gamut of the liquid crystal display device.

The present invention provides a liquid crystal display device including a backlight module, the backlight module including an LED, as shown in FIGS. 1 to 3, the LED 100 includes a holder 1, a light-emitting chip 2, and a light conversion layer, wherein the holder 1 has a cavity open upward; the light-emitting chip 2 is located in the cavity of the holder 1, and is mounted on the bottom wall of the holder 1, and the light emitted by the light-emitting chip 2 The wavelength is shorter than the blue light; the light conversion layer is encapsulated in a cavity of the stent 1, the light conversion layer comprising quantum particles and an encapsulant layer 6, the quantum particles including red quantum particles 3, green quantum particles 4, and blue quantum The particles 5, the encapsulant layer 6 is wrapped around the red quantum particles 3, the green quantum particles 4, and the blue quantum particles 5.

By encapsulating the light-emitting chip 2 with the red quantum particles 3, the green quantum particles 4, and the blue quantum particles 5 in the LED 100 inside, wherein the light-emitting chip 2 emits light having a wavelength shorter than the wavelength of the blue light, and the light emitted by the light-emitting chip 2 excites the red, green and blue quantum particles, so that the LED is provided The backlight module of 100 and the liquid crystal display device have a high color gamut effect, and also improve the light conversion efficiency of the quantum particles.

Since the quantum particles are sensitive to water and oxygen, the long-term contact with water and oxygen in the environment may cause the quantum particles to fail. Therefore, in the embodiment of the present invention, the outer side of the quantum particles is provided with a water-oxygen barrier layer. Specifically, as shown in Figure 1. As shown in FIG. 2, each of the quantum particles has a chemical bond barrier layer 7 on the outside thereof, and the encapsulant layer 6 is a silicone-based encapsulant and has high temperature resistance characteristics; or as shown in FIG.

Each of the quantum particles does not have a chemical bond barrier layer 7 on the outside, and the encapsulant layer 6 is a water-oxygen barrier encapsulant having high temperature resistance and water-blocking properties, and the water-oxygen barrier encapsulant encapsulates the quantum particles to form Water oxygen barrier layer. Both of the above methods can effectively separate the quantum particles from the water and oxygen in the environment, and prevent the quantum particles from failing due to long-term contact with water and oxygen. The following examples all have a chemical bond barrier layer 7 on the outer side of each of the quantum particles. The encapsulant layer 6 is an example of a silicone encapsulant.

The red, green, and blue color quantum particles are excited by the light emitted from the light-emitting chip 2, and various embodiments can be realized. As shown in FIG. 1, the red quantum particles 3, the green quantum particles 4, and the blue quantum particles 5 are in the up and down direction. Layered to form the red quantum layer, the green quantum layer, and the blue quantum layer, wherein a distance between the red quantum layer, the green quantum layer, and the blue quantum layer and the violet chip is Close to far setting, thus greatly improving the LED 100 NTSC gamut values and light conversion efficiency. Of course, the red, green, and blue color quantum particles may be uniformly mixed and packaged on the bottom wall of the stent 1 to form a mixed quantum layer (not shown), specifically, the red quantum particles 3, green. The quantum particles 4 and the blue quantum particles 5 are uniformly mixed and packaged on the holder 1, at this time, the LED The NTSC color gamut value of 100 is 90% to 105%, and the light conversion efficiency is 80% to 90%. Wherein, the red, green and blue quantum particles are layered and packaged in the LED The NTSC color gamut value of 100 is increased by 10% to 20% compared with the uniform application of the three-color quantum particles, and the light conversion efficiency of the quantum particles is increased by 5% to 20%.

In general, the wavelength of blue light is 492-455 nm, the wavelength of green light is 577-492 nm, and the wavelength of red light is 770-622. Nm, in order to increase, while long-wave light has absorption characteristics for short-wave light, and the red, green, and blue quantum particles are gradually moved away from the light-emitting chip 2, thereby avoiding the absorption of short-wave light by long-wave light and making the light conversion efficiency of the quantum particles The light conversion efficiency of each color quantum particle is greatly improved, thereby obtaining a white light source with high brightness and high color gamut.

Further, the red quantum particles 3, the green quantum particles 4, and the blue quantum particles 5 may be layered in the up and down direction to form a single quantum layer and a mixed quantum layer (not shown), the single quantum layer It is composed of one of red quantum particles 3, green quantum particles 4, and blue quantum particles 5 composed of the remaining two of red quantum particles 3, green quantum particles 4, and blue quantum particles 5. Specifically, the single quantum layer is composed of red quantum particles 3 composed of green quantum particles 4 and blue quantum particles 5, wherein the single quantum layer and the mixed quantum layer and the light emitting chip 2 The distance is set from near to far, at this time, LED The NTSC color gamut value of 100 is 110% or more, and the quantum conversion efficiency of the quantum particles is 93% or more; or the single quantum layer is composed of blue quantum particles 5 composed of red quantum particles 3 and green The quantum particles 4 are composed, wherein the distance between the single quantum layer and the mixed quantum layer and the light-emitting chip 2 is set from far to near, at this time, the LED The NTSC color gamut value of 100 is 110% or more, and the light conversion efficiency of the quantum fine particles is 95% or more.

In the embodiment of the invention, the light emitted by the light-emitting chip 2 is purple light (that is, the light-emitting chip 2 is a violet light chip), and the red quantum particles 3 are used in order to match the light emitted by the light-emitting chip 2 with the light emitted by the light-emitting chip 2. The mass ratio of the green quantum particles 4 to the blue quantum particles 5 is 1:3:2 to 1:4:3, and the LEDs obtained by combining the quantum particles and the violet chip 2 are excited by red light. The green and blue three-color quantum particles have an NTSC color gamut value of more than 105%, and the light conversion efficiency of the quantum particles after excitation is over 95%. In other embodiments of the present invention, the light emitted by the light-emitting chip 2 may also be ultraviolet light (ie, the light-emitting chip 2 is an ultraviolet light chip), as long as the wavelength thereof is shorter than the blue light.

Wherein, the quantum particles are quantum dots or quantum rods (both in the embodiment are quantum dots), and the quantum dots or quantum rods are CsPbX3 (X=Cl, Br, I), CdSe, CdTe, MgS, MgSe. , MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe At least one of CdS, GaN, GaP, GaAs, InN, InP, and InAs. The quantum particles are packaged on the support 1 together with the light-emitting chip 2 by an encapsulant, wherein the LED The 100 further includes a gold wire 7. One end of the gold wire 7 is connected to the bracket 1 and the other end is connected to the light-emitting chip 2. After being packaged, the LED 100 can be applied to a direct-type backlight module, and can also be applied to a side-entry backlight module. .

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structural transformation, or direct/indirect use, of the present invention and the contents of the drawings are used in the inventive concept of the present invention. It is included in the scope of the patent protection of the present invention in other related technical fields.

Claims

An LED, comprising:

a bracket having a cavity that opens upward;

a light emitting chip, located in a cavity of the bracket, and mounted on a bottom wall of the bracket, the light emitting chip emitting light having a shorter wavelength than blue light;

a light conversion layer encapsulated in a cavity of the holder, the light conversion layer comprising quantum particles and an encapsulant layer, the quantum particles including red quantum particles, green quantum particles and blue quantum particles, the encapsulation layer wrapped The red quantum particles, the green quantum particles, and the blue quantum particles are disposed.
The LED according to claim 1, wherein each of the quantum particles has a chemical bond barrier layer on the outside, and the encapsulant layer is a silicone-based encapsulant; or

Each of the quantum particles has no chemical bond barrier layer outside, and the encapsulant layer is a water oxygen barrier encapsulant, and the water oxygen barrier encapsulant encapsulates the quantum particles to form a water oxygen barrier layer.
The LED according to claim 1, wherein said red quantum particles, said green quantum particles, and said blue quantum particles are layered in an up and down direction to form a red quantum layer, a green quantum layer, and blue Chromatic quantum layer; or,

The red quantum particles, the green quantum particles, and the blue quantum particles are layered in an up and down direction to form a single quantum layer and a mixed quantum layer, the single quantum layer being composed of the red quantum particles, One of the green quantum particles and the blue quantum particles, the mixed quantum layer being composed of the remaining two of the red quantum particles, the green quantum particles, and the blue quantum particles.
The LED according to claim 3, wherein the distance between the red quantum layer, the green quantum layer, and the blue quantum layer and the light emitting chip is set from near to far.
The LED according to claim 1, wherein the light-emitting chip is a high-energy light source light-emitting chip having a wavelength smaller than that of blue light and having a higher light energy than blue light.
The LED according to claim 1, wherein a mass ratio of said red quantum particles, said green quantum particles to said blue quantum particles is 1:2:1 to 1:4:3.
The LED of claim 1 wherein said quantum particles are quantum dots and quantum rods.
The LED according to claim 1, wherein said quantum particles are CsPbX3 (X = Cl, Br, I), CdSe, CdTe, MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe. , BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe At least one of CdS, GaN, GaP, GaAs, InN, InP, and InAs.
A backlight module includes an LED, the LED comprising:

a bracket having a cavity that opens upward;

a light emitting chip, located in a cavity of the bracket, and mounted on a bottom wall of the bracket, the light emitting chip emitting light having a shorter wavelength than blue light;

a light conversion layer encapsulated in a cavity of the holder, the light conversion layer comprising quantum particles and an encapsulant layer, the quantum particles including red quantum particles, green quantum particles and blue quantum particles, the encapsulation layer wrapped The red quantum particles, the green quantum particles, and the blue quantum particles are disposed.
The backlight module of claim 9, wherein each of the quantum particles has a chemical bond barrier layer, and the encapsulant layer is a silicone-based encapsulant; or

Each of the quantum particles has no chemical bond barrier layer outside, and the encapsulant layer is a water oxygen barrier encapsulant, and the water oxygen barrier encapsulant encapsulates the quantum particles to form a water oxygen barrier layer.
The backlight module according to claim 9, wherein the red quantum particles, the green quantum particles, and the blue quantum particles are layered in an up and down direction to form a red quantum layer and a green quantum layer. And blue quantum layers; or,

The red quantum particles, the green quantum particles, and the blue quantum particles are layered in an up and down direction to form a single quantum layer and a mixed quantum layer, the single quantum layer being composed of the red quantum particles, One of the green quantum particles and the blue quantum particles, the mixed quantum layer being composed of the remaining two of the red quantum particles, the green quantum particles, and the blue quantum particles.
The backlight module according to claim 11, wherein the distance between the red quantum layer, the green quantum layer and the blue quantum layer and the light emitting chip is set from near to far.
A liquid crystal display device includes a backlight module, the backlight module includes an LED, and the LED includes:

a bracket having a cavity that opens upward;

a light emitting chip, located in a cavity of the bracket, and mounted on a bottom wall of the bracket, the light emitting chip emitting light having a shorter wavelength than blue light;

a light conversion layer encapsulated in a cavity of the holder, the light conversion layer comprising quantum particles and an encapsulant layer, the quantum particles including red quantum particles, green quantum particles and blue quantum particles, the encapsulation layer wrapped The red quantum particles, the green quantum particles, and the blue quantum particles are disposed.
The liquid crystal display device according to claim 13, wherein each of the quantum particles has a chemical bond barrier layer on the outside, and the encapsulant layer is a silicone-based encapsulant; or

Each of the quantum particles has no chemical bond barrier layer outside, and the encapsulant layer is a water oxygen barrier encapsulant, and the water oxygen barrier encapsulant encapsulates the quantum particles to form a water oxygen barrier layer.
The liquid crystal display device according to claim 13, wherein the red quantum particles, the green quantum particles, and the blue quantum particles are layered in the up and down direction to form a red quantum layer and a green quantum layer. And blue quantum layers; or,

The red quantum particles, the green quantum particles, and the blue quantum particles are layered in an up and down direction to form a single quantum layer and a mixed quantum layer, the single quantum layer being composed of the red quantum particles, One of the green quantum particles and the blue quantum particles, the mixed quantum layer being composed of the remaining two of the red quantum particles, the green quantum particles, and the blue quantum particles.
A liquid crystal display device according to claim 15, wherein a distance between said red quantum layer, a green quantum layer and a blue quantum layer and said light-emitting chip is set from near to far.
The liquid crystal display device according to claim 13, wherein the light-emitting chip is a high-energy light source light-emitting chip having a wavelength smaller than that of blue light and having a higher light energy than blue light.
The liquid crystal display device according to claim 13, wherein a mass ratio of the red quantum fine particles, the green quantum fine particles, and the blue quantum fine particles is 1:2:1 to 1:4:3.
A liquid crystal display device according to claim 13, wherein said quantum particles are quantum dots and quantum rods.
The liquid crystal display device according to claim 13, wherein the quantum particles are CsPbX3 (X = Cl, Br, I), CdSe, CdTe, MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe. , SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe At least one of CdS, GaN, GaP, GaAs, InN, InP, and InAs.