CN107180908B - LED, backlight module and liquid crystal display device - Google Patents

Abstract

The invention discloses an LED, a backlight module and a liquid crystal display device. The LED includes a bracket, a light-emitting chip and a light conversion layer, wherein the bracket has a cavity opening upward, and the light-emitting chip is located in the cavity of the bracket. inside the body and installed on the bottom wall of the bracket, the wavelength of light emitted by the light-emitting chip is shorter than blue light, the light conversion layer is encapsulated in the cavity of the bracket, and the light conversion layer includes quantum particles and encapsulation glue layer, the quantum particles include red quantum particles, green quantum particles and blue quantum particles, and the encapsulating adhesive layer encloses the arrangement of the red quantum particles, green quantum particles and blue quantum particles. The invention excites red, green and blue three-color quantum particles by light with a wavelength shorter than blue light, so that the backlight module and liquid crystal display device containing the LED can achieve the effect of high color gamut, and at the same time, the light conversion efficiency of the quantum particles is also improved.

Description

A kind of LED, backlight module and liquid crystal display device

technical field

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

Background technique

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

Contents of the invention

The main purpose of the present invention is to provide an LED, a backlight module and a liquid crystal display device, aiming at simplifying the implementation of the backlight module to achieve a high color gamut and reducing costs.

In order to achieve the above object, a kind of LED proposed by the present invention includes:

The bracket has a cavity opening upward;

A light-emitting chip, located in the cavity of the bracket, and mounted on the bottom wall of the bracket, the wavelength of light emitted by the light-emitting chip is shorter than blue light; and,

The light conversion layer is encapsulated in the cavity of the bracket, the light conversion layer includes quantum particles and an encapsulation layer, the quantum particles include red quantum particles, green quantum particles and blue quantum particles, and the encapsulation layer wraps The red quantum particles, green quantum particles and blue quantum particles are set.

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

There is no chemical bond barrier layer on the outside of each of the quantum particles, and the encapsulation layer is a water-oxygen barrier encapsulant, and the water-oxygen barrier encapsulant wraps 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 up and down 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 up and down to form a single quantum layer and a mixed quantum layer, and the single quantum layer consists of the red quantum particles, the The green quantum particle and one of the blue quantum particles, and the mixed quantum layer is composed of the remaining two of the red quantum particle, the green quantum particle and the blue quantum particle.

Preferably, the distances between the red quantum layer, the green quantum layer and the blue quantum layer and the light-emitting chip are set from near to far.

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

Preferably, the mass ratio of the red quantum particles, the green quantum particles and the blue quantum particles is 1:2:1˜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 , at least one of ZnTe, CdS, GaN, GaP, GaAs, InN, InP and InAs.

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

The bracket has a cavity opening upward;

A light-emitting chip, located in the cavity of the bracket, and mounted on the bottom wall of the bracket, the wavelength of light emitted by the light-emitting chip is shorter than blue light; and,

The light conversion layer is encapsulated in the cavity of the bracket, the light conversion layer includes quantum particles and an encapsulation layer, the quantum particles include red quantum particles, green quantum particles and blue quantum particles, and the encapsulation layer wraps The red quantum particles, green quantum particles and blue quantum particles are set.

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

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

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

Fig. 2 is a partial enlarged view of place A in Fig. 1;

Fig. 3 is a schematic structural diagram of another embodiment of the LED provided by the present invention.

Explanation of reference numbers:

label name label name 100 led 5 blue quantum particles 1 bracket 6 Encapsulation layer 2 light emitting chip 7 chemical bond barrier 3 red quantum particles 8 Gold Line 4 green quantum particles

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection 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 the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

At present, there are two main ways to apply quantum dot particles to backlight modules 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 process of these two implementations is complicated, the light conversion efficiency is low, and the cost is also high. In order to simplify the process and reduce the cost, the present invention proposes an LED, a backlight module and a liquid crystal display device to realize a high color gamut of the liquid crystal display device.

The present invention proposes a liquid crystal display device, the liquid crystal display device includes a backlight module, the backlight module includes an LED, as shown in Figures 1 to 3, the LED 100 includes a bracket 1, a light emitting chip 2 and a light conversion layer, wherein, The bracket 1 has a cavity opening upward; the light-emitting chip 2 is located in the cavity of the bracket 1 and installed on the bottom wall of the bracket 1, and the wavelength of the light emitted by the light-emitting chip 2 is shorter than blue light; the light conversion layer is encapsulated in the bracket 1 In the cavity, the light conversion layer includes quantum particles and an encapsulation layer 6, the quantum particles include red quantum particles 3, green quantum particles 4 and blue quantum particles 5, and the encapsulation layer 6 wraps the red quantum particles Particle 3, Green Quantum Particle 4 and Blue Quantum Particle 5 set.

By encapsulating the light-emitting chip 2, the red quantum particles 3, the green quantum particles 4 and the blue quantum particles 5 inside the LED 100, the light-emitting chip 2 emits light with a wavelength shorter than that of blue light, and the light emitted by the light-emitting chip 2 excites red, The green and blue three-color quantum particles make the backlight module and liquid crystal display device provided with the LED 100 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, long-term contact with water and oxygen in the environment will cause the quantum particles to fail. Therefore, in the embodiment of the present invention, a water-oxygen barrier layer is provided on the outside of the quantum particles. Specifically, as shown in Figures 1 and 2, each of the quantum particles has a chemical bond barrier layer 7 on the outside, and at this time, the packaging adhesive layer 6 is a silicone-based packaging adhesive with high temperature resistance; or as shown in Figure 3 , there is no chemical bond barrier layer 7 on the outside of each of the quantum particles, and the encapsulation layer 6 is a water-oxygen barrier encapsulant, which has the characteristics of high temperature resistance and water-oxygen barrier, and the water-oxygen barrier encapsulant wraps the quantum particles to Form a water-oxygen barrier layer. The above two methods can effectively isolate the quantum particles from the water and oxygen in the environment, and avoid the failure of the quantum particles due to long-term contact with water and oxygen. , the encapsulating adhesive layer 6 is silicone encapsulating adhesive as an example.

Red, green, and blue three-color quantum particles can be excited by the light emitted by the light-emitting chip 2, and there are many ways to realize them. Layered arrangement to form the red quantum layer, green quantum layer and blue quantum layer, wherein the distance between the red quantum layer, the green quantum layer and the blue quantum layer and the purple light chip is represented by Near to far settings, thereby greatly improving the NTSC color gamut value and light conversion efficiency of the LED 100 . Of course, the uniform mixing of red, green and blue quantum particles can also be packaged on the bottom wall of the support 1 to form a mixed quantum layer (not shown in the figure), specifically, red quantum particles 3, green The quantum particles 4 and the blue quantum particles 5 are evenly mixed and packaged on the support 1. At this time, the NTSC color gamut of the LED 100 is 90%-105%, and the light conversion efficiency is 80%-90%. Among them, the NTSC color gamut value of the LED 100 packaged with red, green, and blue three-color quantum particles in layers is increased by 10% to 20% compared with the application of uniform mixing of three-color quantum particles, and the light conversion efficiency of excited quantum particles is improved. 5% to 20%.

Generally speaking, blue light has a wavelength of 492-455nm, green light has a wavelength of 577-492nm, and red light has a wavelength of 770-622nm, increasing in order, while long-wave light absorbs short-wave light. If the blue quantum particles are set gradually away from the light-emitting chip 2, the absorption of short-wave light by long-wave light can be avoided to reduce the light conversion efficiency of quantum particles, and the light conversion efficiency of quantum particles of various colors can be greatly improved, thereby obtaining high brightness and high color gamut. white light source.

In addition, the red quantum particles 3, the green quantum particles 4 and the blue quantum particles 5 can also be arranged in layers in the up and down direction to form a single quantum layer and a mixed quantum layer (not shown in the figure), the single quantum layer It is composed of one of red quantum particles 3 , green quantum particles 4 and blue quantum particles 5 , and the mixed quantum layer is 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, and the mixed quantum layer is composed of green quantum particles 4 and blue quantum particles 5, wherein the single quantum layer and the mixed quantum layer are connected with the light-emitting chip 2 The distance is set from near to far. At this time, the NTSC color gamut value of the LED 100 is above 110%, and the light conversion efficiency of excited quantum particles is above 93%; or the single quantum layer is composed of blue quantum particles 5 , the mixed quantum layer is composed of red quantum particles 3 and green quantum particles 4, 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 100 The NTSC color gamut value is above 110%, and the light conversion efficiency of excited quantum particles is above 95%.

In order to make the quantum particles and the light emitted by the light-emitting chip 2 cooperate to obtain white light with a high color gamut, in the embodiment of the present invention, the light emitted by the light-emitting chip 2 is purple light (that is, the light-emitting chip 2 is a purple light chip), and the red quantum particles 3 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 LED obtained by co-packaging the quantum particles combined with the purple light chip 2 in this ratio can excite red, 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 excited quantum particles reaches more than 95%. In other embodiments of the present invention, the light emitted by the light-emitting chip 2 can also be ultraviolet light (that is, the light-emitting chip 2 is an ultraviolet light chip), as long as its wavelength is shorter than blue light, it can meet the requirements.

Wherein, the quantum particles are quantum dots or quantum rods (this embodiment all takes quantum dots as an example), 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, CdS, GaN, GaP, GaAs, InN, InP and InAs at least one. The quantum particles and the light-emitting chip 2 are packaged on the bracket 1 through encapsulation glue, wherein the LED 100 also 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 packaging, the LED 100 It can be applied to the direct-type backlight module, and can also be applied to the side-type backlight module.

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (8)

1. An LED, comprising:

the bracket is provided with a cavity which is opened upwards;

the light emitting chip is positioned in the cavity of the bracket and is arranged on the bottom wall of the bracket, and the wavelength of light emitted by the light emitting chip is shorter than that of blue light; and the number of the first and second groups,

the utility model provides a light conversion layer, including the support, light conversion layer, encapsulation in the cavity of support, light conversion layer includes quantum particle and packaging adhesive layer, the quantum particle includes red quantum particle, green quantum particle and blue quantum particle, packaging adhesive layer parcel red quantum particle, green quantum particle and blue quantum particle set up, red quantum particle green quantum particle with blue quantum particle sets up in the upper and lower direction layering to form single quantum layer and mixed quantum layer, single quantum layer by blue quantum particle constitutes, mixed quantum layer by red quantum particle with green quantum particle constitutes, single quantum layer with the distance of mixed quantum layer and luminescent chip is by far away to nearly setting up.

2. The LED of 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 the like, or, alternatively,

each quantum particle outside does not have the chemical bond barrier layer, the encapsulation glue film is water oxygen separation encapsulation glue, water oxygen separation encapsulation glue parcel the quantum particle is in order to form water oxygen barrier layer.

3. The LED of claim 1, wherein said light emitting chip is a high energy light source light emitting chip having a wavelength less than blue light and light energy more intense than blue light.

4. The LED according to claim 1, wherein a mass ratio of the red, green and blue quantum particles is 1:2:1 to 1:4: 3.

5. The LED of claim 1, wherein the quantum particles are quantum dots and quantum rods.

6. The LED of claim 1, wherein the quantum particles are at least one of CsPbX3(X ═ Cl, Br, I), CdSe, CdTe, MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe, CdS, GaN, GaP, GaAs, InN, InP, and InAs.

7. A backlight module comprising the LED of any one of claims 1-6.

8. A liquid crystal display device comprising the backlight module according to claim 7.