WO2020199255A1

WO2020199255A1 - Led device and display unit

Info

Publication number: WO2020199255A1
Application number: PCT/CN2019/083187
Authority: WO
Inventors: 樊勇
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2019-04-03
Filing date: 2019-04-18
Publication date: 2020-10-08
Also published as: CN110034226A

Abstract

Disclosed are a LED device and a display unit. A metal reflecting layer (106) and a quantum dot (107) are arranged in a light emitting groove of the LED device, thereby increasing light reflection paths, effectively improving energy utilization and lightness of the required light, reducing power consumption, reducing material use and cost, and at the same time obstructing water oxygen so as to guarantee the reliability of quantum dot application.

Description

LED device and display device

Technical field

The invention relates to the field of display technology, in particular to an LED device and a display device.

Background technique

In the micro light emitting diode (micro Light emitting diode, micro LED) The full-color solution of display devices is mainly divided into a full-color solution using red, green and blue micro LEDs and a full-color solution using blue light + photoconversion layer. Because the red, green, and blue chips have different lifespans, and the wavelength of the three-color chips varies differently under different current densities, it is easy to cause Micro The uneven chromaticity and brightness of LED displays and long-term use cause color and brightness variations; in addition, in the use of RGB three-color micro LED chips, the luminous efficiency of red and green light is much lower than that of blue light, and due to the use of three-color chips, large-scale The benefit is not as good as the use of a blue light chip, and the cost is higher.

However, in the blue chip + light conversion layer solution, the light conversion layer usually uses quantum dot materials that require high absorptivity, narrow light-emitting spectrum, and high light-emitting efficiency. However, the quantum dot material is afraid of water, oxygen and strong light, and the quantum dots need to be packaged for water and oxygen resistance; in addition, due to the process conditions, the thickness of the arrayed quantum dot layer is generally <10um, which requires a relatively high concentration of quantum dots , But the concentration of quantum dots increases, and the fluorescence conversion efficiency decreases due to the concentration quenching effect.

technical problem

Technical solutions

The embodiments of the present invention provide an LED device and a display device, which improve the energy utilization and brightness of the required light and reduce power consumption; and reduce the use of materials, reduce costs, and at the same time achieve the barrier effect on water and oxygen, Ensure the reliability of quantum dot applications.

In order to solve the above problems, in the first aspect, the present application provides an LED device, the LED device includes: a first substrate, the first substrate is provided with a first U-shaped groove; a second substrate, and the first substrate A substrate is disposed opposite to each other, a second U-shaped groove is provided on the second substrate, and the second U-shaped groove is disposed opposite to the first U-shaped groove; the first light-emitting chip is disposed on the first U-shaped groove. In the groove; the first metal reflective layer is arranged on the side wall of the first U-shaped groove and the inner wall of the second U-shaped groove; the first quantum dot layer is arranged in the second U-shaped groove; The corresponding light-emitting color of the first light-emitting chip is different from the color of the first quantum dot layer.

In some embodiments, the first light-emitting chip is a blue LED chip, and the first quantum dot layer is a red quantum dot layer or a green quantum dot layer.

In some embodiments, a third U-shaped groove is further provided on the first substrate, a fourth U-shaped groove is further provided on the second substrate, and the third U-shaped groove is opposite to the fourth U-shaped groove. Type groove setting;

The LED device further includes:

The second light-emitting chip is arranged in the third U-shaped groove.

In some embodiments, the second light-emitting chip is a red LED chip or a green LED chip.

In some embodiments, the LED device further includes:

The second metal reflective layer is arranged on the side wall of the third U-shaped groove and the inner wall of the fourth U-shaped groove;

The second quantum dot layer is arranged in the fourth U-shaped groove.

In some embodiments, the second light-emitting chip is a blue LED chip, and the corresponding light-emitting color of the second light-emitting chip is different from the color of the second quantum dot layer.

In some embodiments, the LED device further includes:

The third metal reflective layer is arranged on the side wall of the third U-shaped groove and the inner wall of the fourth U-shaped groove.

In some embodiments, the first substrate is a TFT substrate.

In some embodiments, the first quantum dot layer is formed by placing quantum dot ink in the second groove by inkjet printing.

In some embodiments, the first U-shaped groove and the second U-shaped groove form a light-emitting groove.

In the second aspect, the present application provides a display device,

The display device includes an LED device, and the LED device includes:

A first substrate on which a first U-shaped groove is provided;

The second substrate is arranged opposite to the first substrate, a second U-shaped groove is provided on the second substrate, and the second U-shaped groove is arranged opposite to the first U-shaped groove;

The first light-emitting chip is arranged in the first U-shaped groove;

The first metal reflective layer is arranged on the side wall of the first U-shaped groove and the inner wall of the second U-shaped groove;

The first quantum dot layer is arranged in the second U-shaped groove;

The corresponding light-emitting color of the first light-emitting chip is different from the color of the first quantum dot layer.

The LED device further includes:

The second light-emitting chip is arranged in the third U-shaped groove.

In some embodiments, the LED device further includes:

The second quantum dot layer is arranged in the fourth U-shaped groove.

In some embodiments, the LED device further includes:

In some embodiments, the first substrate is a TFT substrate.

In some embodiments, the first quantum dot layer is formed by placing quantum dot ink in the second U-shaped groove by means of inkjet printing.

Beneficial effect

In the embodiment of the present invention, the metal reflective layer and the quantum dot layer are arranged in the light-emitting groove of the LED device to increase the light reflection path, which can effectively improve the energy utilization and brightness of the required light, and reduce the power consumption; and reduce the material The use of, reduces the cost, but also achieves the barrier effect on water and oxygen, and ensures the reliability of the application of quantum dots.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

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

Embodiments of the invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, and “outer” are based on the orientation shown in the drawings Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more than two, unless specifically defined otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described as "exemplary" in this application is not necessarily construed as being more preferred or advantageous over other embodiments. In order to enable any person skilled in the art to implement and use the present invention, the following description is given. In the following description, the details are listed for the purpose of explanation. It should be understood that those of ordinary skill in the art may realize that the present invention can also be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the illustrated embodiments, but is consistent with the widest scope that conforms to the principles and features disclosed in this application.

At present, in the full-color scheme of micro light emitting diode (micro LED) display devices, it is mainly divided into the use of red, green and blue micro The LED full-color solution and the full-color solution using blue light + photoconversion layer. Since the red, green and blue chips have different lifespans and forward voltages, and because the three-color chips have different wavelength changes under different current densities, it is easy to cause Micro The uneven chromaticity and brightness of the LED display and long-term use cause color and brightness variation;

Based on this, embodiments of the present invention provide an LED device and a display device. Detailed descriptions are given below.

First, an embodiment of the present invention provides an LED device. The LED device includes a first substrate on which a first U-shaped groove is provided; a second substrate is provided opposite to the first substrate. The second substrate is provided with a second U-shaped groove, and the second U-shaped groove is arranged opposite to the first U-shaped groove; the first light-emitting chip is arranged in the first U-shaped groove; The metal reflective layer is arranged on the sidewall of the first U-shaped groove and the inner wall of the second U-shaped groove; the first quantum dot layer is arranged in the second U-shaped groove; the first light-emitting chip corresponds to The emission color is different from the color of the first quantum dot layer.

As shown in FIG. 1, it is a schematic structural diagram of an embodiment of the LED device in the embodiment of the present invention. The LED device includes a first substrate 101 on which a first U-shaped groove 102 is provided; a second substrate 103, opposite to the first substrate 101, a second U-shaped groove 104 is provided on the second substrate 103, and the second U-shaped groove 104 is opposite to the first U-shaped groove 102; The light emitting chip 105 is arranged in the first U-shaped groove 102; the first metal reflective layer 106 is arranged on the side wall of the first U-shaped groove 102 and the inner wall of the second U-shaped groove 104; The dot layer 107 is disposed in the second U-shaped groove 104.

In the embodiment of the present invention, a first metal reflective layer 106 is provided on the side wall of the first U-shaped groove 102 and the inner wall of the second U-shaped groove 104, and a quantum dot is provided in the second U-shaped groove 104 The layer 107 increases the light reflection path, which can effectively improve the energy utilization and brightness of the required light, reduce power consumption, and reduce the use of materials, and reduce costs; at the same time, it also achieves the barrier effect of water and oxygen, ensuring The reliability of quantum dot applications.

In LED devices, in general, due to the need to emit multi-color light, such as RGB three colors, there are generally three light-emitting grooves in the LED light-emitting device, as shown in FIG. 1, in the embodiment of the present invention, relatively disposed The first U-shaped groove 102 and the second U-shaped groove 104 form a light-emitting groove.

In the embodiment of the present invention, the light-emitting groove formed by the first U-shaped groove 102 and the second U-shaped groove 104 may be a light-emitting groove corresponding to any color of R, G, and B. Since the luminous efficiency of red light and green light is much lower than that of blue light in the RGB three-color LED chip, in the embodiment of the present invention, the light-emitting groove corresponding to the red light and/or green light can be improved in the LED device , And the blue LED chip is directly used for the blue light emitting groove.

Assuming that the first light-emitting chip 105 is located in the LED device corresponding to the light-emitting groove emitting red or green light, at this time, the first light-emitting chip 105 is a blue LED chip, and correspondingly, the first quantum dot layer 107 is a red quantum dot layer Or the green quantum dot layer, and then absorb the blue light emitted by the first light-emitting chip 105 through the red quantum dot layer or the green quantum dot layer, thereby emitting red light or green light.

Since the blue light emitted from the blue LED chip is reflected by the first metal reflective layer on the surface of the first U-shaped groove in the first substrate and the second U-shaped groove in the second substrate, the blue light is added to the first quantum dot layer. The propagation path of the first quantum dot layer can make the first quantum dot layer fully absorb blue light, thereby reducing the residual blue light, improving the energy utilization rate, which is conducive to improving brightness and reducing power consumption; at the same time, due to the propagation path of blue light in the first quantum dot layer Increase can reduce the concentration of quantum dot ink, reduce material usage, and improve fluorescence conversion efficiency. In addition, since the first quantum dot layer has a substrate above and below, it can achieve a good barrier effect on water vapor and oxygen, and can ensure the reliability of the application of quantum dots.

On the basis of the foregoing embodiment, in another preferred embodiment of the present application, as shown in FIG. 1, the first substrate 101 is a TFT substrate, and a thin film transistor (Thin-film transistor, TFT) is a field effect transistor. One of the types, the rough production method is to deposit various thin films on the substrate, such as semiconductor active layers, dielectric layers and metal electrode layers. Thin film transistors play a very important role in the performance of the display device. The first quantum dot layer 107 is formed by placing quantum dot ink in the second groove 104 by inkjet printing.

As shown in FIG. 1, a third U-shaped groove 108 may also be provided on the first substrate 101, and a fourth U-shaped groove 109 may also be provided on the second substrate. Relative to the fourth U-shaped groove 109; the LED device may further include: a second light-emitting chip 110 arranged in the third U-shaped groove 108, on the basis of the above-mentioned embodiment, in another aspect of this application In one embodiment, only the light-emitting groove corresponding to one of red light or green light in the LED device may be improved. In this case, the second light-emitting chip 110 is a red LED chip or a green LED chip, The light-emitting grooves corresponding to the third U-shaped groove 108 and the fourth U-shaped groove 109 are light-emitting grooves emitting red light or light-emitting grooves emitting green light.

When the light-emitting groove corresponding to the red light in the LED device is improved, the light-emitting grooves corresponding to the first U-shaped groove 102 and the second U-shaped groove 104 are light-emitting grooves that emit red light, and the first light-emitting groove The chip is a blue LED chip, the first quantum dot layer is a red quantum dot layer, and the second light-emitting chip is a green LED chip. There can be no improvement compared to the prior art. Similarly, when the LED device corresponding to the light-emitting recess that emits green light When the groove is improved, the light-emitting grooves corresponding to the first U-shaped groove 102 and the second U-shaped groove 104 are light-emitting grooves that emit green light, the first light-emitting chip is a blue LED chip, and the first quantum dot layer is The green quantum dot layer, and the second light-emitting chip is a red LED chip, which may not be improved compared to the prior art.

Of course, in the embodiment of the present invention, the light-emitting groove corresponding to the red light and the green light in the LED device can also be improved at the same time. Therefore, on the basis of the above-mentioned embodiment, in another embodiment of the present application, The LED device may further include: a second metal reflective layer 111 arranged on the sidewall of the first U-shaped groove 102 and the inner wall of the fourth U-shaped groove 109; a second quantum dot layer 112 arranged on the fourth In the U-shaped groove 109, the second light-emitting chip 110 is a blue LED chip, and the corresponding light-emitting color of the second light-emitting chip 110 is different from that of the second quantum dot layer. The first quantum dot layer and the second quantum dot layer The dot layers have different colors. Specifically, the first light-emitting chip and the second light-emitting chip are both blue light chips. If the first quantum dot layer is a red quantum dot layer, the second quantum dot layer is a green quantum dot layer. The dot layer is a green quantum dot layer, and the second quantum dot layer is a red quantum dot layer.

For example, in this embodiment, on the basis of the above-mentioned embodiment, the two light-emitting grooves that emit red and green light in the LED device are simultaneously improved. Specifically, the metal reflective layer and quantum dot layer are also provided. Further increase the light reflection path of the light-emitting chip in the LED device, which can effectively improve the energy utilization and brightness of the required light, reduce power consumption, and reduce the use of materials and reduce costs; at the same time, it also achieves the barrier to water and oxygen. The function ensures the reliability of the application of quantum dots and further improves its luminous quality.

On the basis of the above-mentioned embodiment, in another embodiment of the present application, the light-emitting groove that emits blue light can also be improved. Although the blue LED chip has the highest luminous efficiency, it can be improved by comparing the light-emitting groove that emits blue light. The metal reflective layer is added to the groove to further improve the utilization of light energy. At this time, the light-emitting grooves corresponding to the third U-shaped groove 108 and the fourth U-shaped groove 109 are light-emitting grooves that emit blue light, and the second The light-emitting chip is a blue LED chip, and the LED device further includes: a third metal reflective layer disposed on the side wall of the third U-shaped groove and the inner wall of the fourth U-shaped groove. In this embodiment, on the basis of the above-mentioned embodiment, the light-emitting groove in the LED device that emits blue light is improved, and a metal reflective layer is arranged in it, which can effectively reflect light and further improve its light-emitting quality.

It is understandable that, in the embodiment of the present invention, the three light-emitting grooves emitting RGB three-color light in the LED device can also be improved at the same time. In a specific embodiment, the LED device includes:

A first substrate on which a first U-shaped groove is provided;

The first light-emitting chip is arranged in the first U-shaped groove;

The first quantum dot layer is arranged in the second U-shaped groove;

The first light-emitting chip is a blue LED chip, and the first quantum dot layer is a red quantum dot layer.

The first light-emitting chip, the first metal reflective layer and the first quantum dot layer correspondingly emit red light, and in addition, correspondingly emit green light, the first substrate is also provided with a third U-shaped groove, and the second substrate A fourth U-shaped groove is further provided thereon, and the third U-shaped groove is disposed opposite to the fourth U-shaped groove;

The LED device further includes:

The second light-emitting chip is arranged in the third U-shaped groove;

The second quantum dot layer is arranged in the fourth U-shaped groove.

The second light-emitting chip is a blue LED chip, and the second quantum dot layer is a green quantum dot layer.

In addition, corresponding to the emission of blue light, a fifth U-shaped groove is further provided on the first substrate, and a sixth U-shaped groove is further provided on the second substrate. The fifth U-shaped groove is opposite to the sixth U-shaped groove. U-shaped groove setting;

The LED device further includes:

The third light-emitting chip is arranged in the fifth U-shaped groove, and the third light-emitting chip is a blue LED chip;

The third metal reflective layer is arranged on the side wall of the fifth U-shaped groove and the inner wall of the sixth U-shaped groove.

In some embodiments of the present invention, the LED device may not only include light-emitting grooves emitting RGB three-color light, but may include more light-emitting groove structures. In this case, each light-emitting groove structure may refer to the light-emitting grooves in the above embodiments. The improvement of the groove improves the luminous efficiency.

In order to better implement the LED devices in the embodiments of the present invention, on the basis of the LED devices, the embodiments of the present invention also provide a display device, and the display device includes the LED devices as described in the foregoing embodiments.

By adopting the LED device described in the above embodiment, the performance of the display device is further improved.

In the above-mentioned embodiments, the description of each embodiment has its own focus. For a part that is not described in detail in an embodiment, please refer to the detailed description of other embodiments above, which will not be repeated here.

During specific implementation, each of the above units or structures can be implemented as independent entities, or can be combined arbitrarily, and implemented as the same or several entities. For the specific implementation of each of the above units or structures, please refer to the previous method embodiments. No longer.

For the specific implementation of the above operations, please refer to the previous embodiments, which will not be repeated here.

The LED device and display device provided by the embodiments of the present invention are described in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be construed as a reference to this Limitations of the invention.

Claims

An LED device, wherein the LED device includes:

A first substrate on which a first U-shaped groove is provided;

The second substrate is arranged opposite to the first substrate, a second U-shaped groove is provided on the second substrate, and the second U-shaped groove is arranged opposite to the first U-shaped groove;

The first light-emitting chip is arranged in the first U-shaped groove;

The first metal reflective layer is arranged on the side wall of the first U-shaped groove and the inner wall of the second U-shaped groove;

The first quantum dot layer is arranged in the second U-shaped groove;

The corresponding light-emitting color of the first light-emitting chip is different from the color of the first quantum dot layer.
The LED device according to claim 1, wherein the first light-emitting chip is a blue LED chip, and the first quantum dot layer is a red quantum dot layer or a green quantum dot layer.
The LED device according to claim 1, wherein a third U-shaped groove is further provided on the first substrate, a fourth U-shaped groove is further provided on the second substrate, and the third U-shaped groove The groove is arranged relative to the fourth U-shaped groove;

The LED device further includes:

The second light-emitting chip is arranged in the third U-shaped groove.
The LED device according to claim 3, wherein the second light-emitting chip is a red LED chip or a green LED chip.
The LED device according to claim 3, wherein the LED device further comprises:

The second metal reflective layer is arranged on the side wall of the third U-shaped groove and the inner wall of the fourth U-shaped groove;

The second quantum dot layer is arranged in the fourth U-shaped groove.
The LED device according to claim 5, wherein the second light-emitting chip is a blue LED chip, and the corresponding light-emitting color of the second light-emitting chip is different from the color of the second quantum dot layer.
The LED device according to claim 3, wherein the LED device further comprises:

The third metal reflective layer is arranged on the side wall of the third U-shaped groove and the inner wall of the fourth U-shaped groove.
The LED device according to claim 1, wherein the first substrate is a TFT substrate.
The LED device according to claim 1, wherein the first quantum dot layer is formed by placing quantum dot ink in the second U-shaped groove by inkjet printing.
The LED device of claim 1, wherein the first U-shaped groove and the second U-shaped groove form a light-emitting groove.
A display device, wherein the display device includes an LED device, and the LED device includes:

A first substrate on which a first U-shaped groove is provided;

The second substrate is arranged opposite to the first substrate, a second U-shaped groove is provided on the second substrate, and the second U-shaped groove is arranged opposite to the first U-shaped groove;

The first light-emitting chip is arranged in the first U-shaped groove;

The first metal reflective layer is arranged on the side wall of the first U-shaped groove and the inner wall of the second U-shaped groove;

The first quantum dot layer is arranged in the second U-shaped groove;

The corresponding light-emitting color of the first light-emitting chip is different from the color of the first quantum dot layer.
11. The display device of claim 11, wherein the first light-emitting chip is a blue LED chip, and the first quantum dot layer is a red quantum dot layer or a green quantum dot layer.
11. The display device according to claim 11, wherein a third U-shaped groove is further provided on the first substrate, a fourth U-shaped groove is further provided on the second substrate, and the third U-shaped groove is further provided on the second substrate. The groove is arranged relative to the fourth U-shaped groove;

The LED device further includes:

The second light-emitting chip is arranged in the third U-shaped groove.
The display device according to claim 13, wherein the second light-emitting chip is a red LED chip or a green LED chip.
The display device according to claim 13, wherein the LED device further comprises:

The second metal reflective layer is arranged on the side wall of the third U-shaped groove and the inner wall of the fourth U-shaped groove;

The second quantum dot layer is arranged in the fourth U-shaped groove.
15. The display device according to claim 15, wherein the second light-emitting chip is a blue LED chip, and the corresponding light-emitting color of the second light-emitting chip is different from the color of the second quantum dot layer.
The display device according to claim 13, wherein the LED device further comprises:

The third metal reflective layer is arranged on the side wall of the third U-shaped groove and the inner wall of the fourth U-shaped groove.
The display device of claim 11, wherein the first substrate is a TFT substrate.
11. The display device according to claim 11, wherein the first quantum dot layer is formed by placing quantum dot ink in the second U-shaped groove by inkjet printing.
11. The display device of claim 11, wherein the first U-shaped groove and the second U-shaped groove form a light-emitting groove.