WO2015010407A1

WO2015010407A1 - Led and display device

Info

Publication number: WO2015010407A1
Application number: PCT/CN2013/088394
Authority: WO
Inventors: 王庆江
Original assignee: 京东方科技集团股份有限公司
Priority date: 2013-07-26
Filing date: 2013-12-03
Publication date: 2015-01-29
Also published as: CN103441123A

Abstract

An LED (100) and a display device using the LED (100). The LED (100) comprises a LED chip (101, 1, 301), an encapsulant (102, 9) encapsulating the LED chip (101, 1, 301), and a lens (103, 10, 303) which covers the encapsulant (102, 9). Quantum dot material (104, 11, 304) capable of emitting light under the irradiation of the LED chip (101, 1, 301) is doped in the lens (103, 10, 303). Since the quantum dot material (104) is doped in the lens (103, 10, 303), the lens (103, 10, 303) is farther away from the LED chip (101, 1, 301), and the impact of the temperature of the LED chips (101, 1, 301) on the quantum dot material (104) is small, enabling the display device using the LED (100) to reduce the colour deviation and thereby improve the display quality.

Description

LED and display device

Embodiments of the present invention relate to display technology, and more particularly to an LED and a display device including the same. Background technique

At present, in display devices, especially liquid crystal display devices, backlights are usually illuminated by LEDs (Light Emitting Diodes).

The principle of LED illumination is: The LED chip is a blue chip, and the quantum dot material is doped in the potting glue. After the blue light emitted by the LED chip is irradiated to the quantum dot, the quantum dot material is excited to emit red light and green light, and RGB The base color is used to synthesize white light.

However, the current quantum dot materials are filled in the potting compound, and the potting compound is potted on the LED chip. When the LED chip is operated for a long time, the heat generated causes the temperature of the LED chip to rise, and at the same time, the temperature of the quantum dot material in the potting compound rises. This temperature rise reduces the stability of the quantum dot material and produces color deviations. Summary of the invention

Embodiments of the present invention provide an LED to reduce color deviation of LED illumination. Embodiments of the present invention also provide a display device including the LED.

An LED according to an embodiment of the invention includes: a light emitting diode (LED) chip, a potting compound potted on the LED chip, and a lamp cover over the potting glue, wherein:

The lampshade is doped with a quantum dot material that is capable of emitting light under the illumination of light emitted by the LED chip.

A display device comprising a light emitting diode LED according to an embodiment of the invention.

In the LED according to the embodiment of the invention, the quantum dot material capable of emitting light under the illumination of the light emitted by the LED chip is doped in the lamp cover, since the lamp cover is far from the LED chip, wherein the doped quantum dot material is subjected to the LED chip temperature Less affected. In this way, the color deviation of the light emitted by the LED can be reduced. Further, the display quality of the display device using the LED can be improved. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, rather than to the present invention. limit.

1 is a schematic structural diagram of an LED according to an embodiment of the present invention;

2 is a schematic structural view of an LED according to another embodiment of the present invention;

3 is a schematic view showing the structure of an LED according to still another embodiment of the present invention. detailed description

The technical solutions of the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present invention. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

Embodiments of the present invention provide an LED, a quantum dot material capable of emitting light under illumination of light emitted by an LED chip is doped in a lamp cover, and the quantum dot material is less affected by the temperature of the LED chip because the lamp cover is farther away from the LED chip. , can reduce the color deviation of the light emitted by the LED.

As shown in FIG. 1 , the LED 100 provided by the embodiment of the present invention includes:

The LED chip 101, the potting compound 102 potted on the LED chip 101, and the lamp cover 103 covered on the potting glue, wherein:

The globe 103 is doped with a quantum dot material 104 which is capable of emitting light under the illumination of the light emitted by the LED chip 101.

The LED 100 can be used as a light source in a liquid crystal display device, and can also be used as a light source in a lighting device.

Generally, when the LED chip 101 is energized to emit blue light, the quantum dot material 104 emits light having a wavelength greater than that of the blue light, such as yellow light, red light, and green light, under the blue light emitted by the LED chip 101.

Depending on the composition of the doped quantum dot material 104, the lampshade can exhibit red, green, white, and the like.

The quantum dot material 104 may be a mixture of calcium sulfide and a sulfide ion doped with copper ions, and / Or a metal ruthenium ion-doped volatilization, wherein a mixture of calcium sulfide and a copper ion-doped volatilization can emit red light under the blue light emitted by the LED chip 101, and the doping of the metal-doped ion can be The blue light emitted by the LED chip 101 emits green light.

By properly setting and adjusting the ratio of the components in the quantum dot material 104, the LED can emit light of a desired color.

Usually, when the lampshade 103 is produced, the raw material is processed into pellets, and the pellets are produced into a lampshade 103 by injection molding.

When the quantum dot material 104 is doped into the lampshade 103, it may be doped during the production of the pellets to form pellets doped with the quantum dot material 104; the pellets may also be processed to form a doped quantum dot material. The pellets of 104; doping of the quantum dot material 104 may also be performed when the pellets 103 are injection molded using the pellets.

In order to further reduce the influence of the heat generated by the LED chip 101 on the quantum dot material 104, a gap may be left between the lamp cover 103 and the potting compound 102, as shown in FIG. When there is a gap between the lamp cover 103 and the potting compound 102, the heat generated by the LED chip 101 is not easily transmitted to the lamp cover 103, which reduces the influence of the temperature of the LED chip 101 on the stability of the quantum dot material 104, and ensures the color display quality.

Further, the gap between the lamp cover 103 and the potting glue can be set to a vacuum. At this time, the heat generated by the LED chip 101 is hard to be conducted into the lamp cover 103, and the quantum dot material 104 is no longer affected by the heat generated by the LED chip 101, thereby avoiding The color deviation of the LED light emission due to the heat generation of the LED chip 101.

Usually, the LED chip 101 and the lamp cover 103 are both fixed on the LED substrate due to

The LED substrate is usually provided with a circuit formed of a conductive layer, so that the lamp cover 103 is fixed on the resistive film provided outside the conductive layer of the LED substrate.

An LED structure in accordance with another embodiment of the present invention is shown in FIG. As shown in Figure 2, the substrate

4 is plated with a substrate plating layer 3, and the LED chip 1 is fixed on the substrate plating layer 3 by a die bonding glue 2, the metal wire 8 connects the LED chip 1 with the positive and negative conductive layers 6, and the conductive layer 6 and the substrate plating layer 3 are provided with heat conduction. The insulating layer 5 and the potting glue 9 encapsulate the LED chip 2 and the metal wire 8, and the lamp cover 10 is fixed on the resistive film

7, wherein the lampshade 10 is doped with a plurality of quantum dot materials 11.

In order to further reduce the influence of the heat emitted by the LED chip on the quantum dot material in the lampshade, as shown in the figure

As shown in FIG. 3, the LED chip 301 can be fixed on the LED substrate 305, and the lamp cover 303 doped with the quantum dot material 304 is fixed inside the package casing 306 of the LED. At this time, the lamp cover 303 and The distance of the LED chip 301 is larger, further reducing the influence of the heat generated by the LED chip 301 on the quantum dot material 304 in the lamp cover 303.

Embodiments of the present invention also provide a display device including the above LED.

In the LED and the display device, the quantum dot material capable of emitting light under the illumination of the emitted light of the LED chip is doped in the lamp cover. Since the lamp cover is far away from the LED chip, the quantum dot material is subjected to the LED chip. The temperature effect is small. This can reduce the color deviation of the light emitted by the LED and improve the display quality.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

Claim

An LED comprising: a light emitting diode LED chip, a potting compound potted on the LED chip, and a lamp cover over the potting glue, wherein:

2. The LED of claim 1, wherein there is a gap between the lamp cover and the potting compound.

3. The LED of claim 2, wherein a gap between the lamp cover and the potting compound is a vacuum.

The LED according to any one of claims 1 to 3, wherein the LED chip emits blue light after being energized; under the illumination of the blue light emitted by the LED chip, the light emitted by the quantum dot material The wavelength is greater than the wavelength of blue light.

The LED according to claim 4, wherein the light having a wavelength greater than a wavelength of blue light is yellow light, red light or green light.

The LED according to any one of claims 1 to 5, wherein the quantum dot material comprises a mixture of calcium sulfide and a sulfide ion doped with copper ions, or a sulfurized word doped with barium ions. The mixture is used to emit red light under the illumination of blue light emitted by the LED chip, and the ruthenium-doped ruthenium is used to emit green light under the blue light emitted by the LED chip.

The LED according to any one of claims 1 to 5, wherein the quantum dot material comprises a mixture of calcium sulfide and a sulfide ion doped with copper ions, and a sulfurization word doped with barium ions, The mixture is used to emit red light under the illumination of the blue light emitted by the LED chip, which is used to emit green light under the illumination of the blue light emitted by the LED chip.

The LED according to any one of claims 1 to 7, further comprising an LED substrate, the LED chip and the lamp cover being fixed on the LED substrate.

The LED according to claim 8, wherein the LED chip is fixed on the LED substrate by a bonding adhesive; the lamp cover is fixed on a resistive film provided on a conductive layer on the LED substrate.

The LED according to any one of claims 1 to 7, wherein the LED further comprises an LED substrate and a package housing, the LED chip is fixed on the LED substrate, and the lamp cover is fixed On the inside of the package housing.

A display device comprising the LED according to any one of claims 1 to 10 for use as a backlight.