TW202132868A - Lighting module - Google Patents

Abstract

The present invention discloses a lighting module, which comprises a transparent substrate, a light emission layer, a light transmission layer, and a light filtering layer. The light emission layer is disposed on the transparent substrate. The light transmission layer is disposed on the light emission layer. The light filtering layer is disposed on the light transmission layer. The light filtering layer includes multiple quantum dots. The quantum dots include a red, a green, a blue, or an arbitrary combination of light color. A light ray from the light emission layer enters the light filtering layer to excite the quantum dots so as to form a light color of a full color spectrum. As such, complicated backlight control of a known liquid crystal display device can be simplified, in order to reduce the components used and to lower down the cost. Further, the light emission layer may use an organic light-emitting diode having a light color of blue or purple so that the lighting module of the present invention may have a high luminous power and conversion efficiency.

Description

Light-emitting module

The present invention relates to a light-emitting module; more particularly, the light-emitting module can be used as a high-efficiency backlight of a display device.

So far, display devices have been rapidly developed and become an important human-machine interface for electronic devices. Such as portable electronic devices, computers or televisions, have been able to provide complex information presentation through display devices.

Based on the requirements for viewing area, thinness, and energy consumption of display devices, liquid crystal display devices (LCDs) have now become popular and become mainstream. In a conventional liquid crystal display structure, a backlight module, a first polarizer, a first substrate, a transistor layer, a first electrode, a liquid crystal layer, and a second electrode are roughly arranged from bottom to top. , A color filter, a second substrate and a second polarizer. The outline and its operating principle are based on the characteristics of the liquid crystal molecules in the liquid crystal layer that are twisted by voltage. One or more transistors in the transistor layer control the twisting direction of the liquid crystal molecules in the liquid crystal layer as a switch for light to pass through; Furthermore, the light emitted by the backlight module is transmitted through the cooperation of the first polarizer and the second polarizer to generate polarized light in different directions, so as to match the twisting direction of the liquid crystal molecules to produce brightness changes, thereby forming the required gray Order. In order to form the required colored light, multiple pixel units are usually arranged on the color filter, and each pixel The units correspond to different light colors to form images with different colors that are visible to the naked eye. In addition, alignment films can be arranged on the first substrate and the second substrate to assist the twist recovery of the liquid crystal molecules of the liquid crystal layer. The voltage required by the transistor layer can be provided through the first electrode and the second electrode.

The above-mentioned liquid crystal display is based on the fact that only a small part of the light emitted by the backlight module can penetrate the liquid crystal layer, so its power efficiency is still low, and the brightness (contrast) is still insufficient. Furthermore, the manufacturing complexity of the transistor required to control the twisting of the liquid crystal molecules is high, resulting in the high manufacturing cost of the overall liquid crystal display device. Moreover, its viewing angle is also limited. Furthermore, the conventional method is to irradiate the fluorescent material with blue light to generate yellow light and color mixing to generate full-color light corresponding to the full frequency range. This kind of light distribution method is not only inefficient, but also insufficient in the gradation of the light color, which can no longer meet the current demand for high resolution and high chroma of the display device, and its volume is still too large to be portable.

Therefore, it is still necessary to develop display devices with simple components, high luminous power and conversion efficiency, wide viewing angle, long lifespan, and light, thin and portable display devices.

The present invention provides a light-emitting module that can be used for the backlight of a display device. The light color of the light-emitting layer and the filter layer with a stack of quantum dots can be matched to simplify the complicated backlight control of the conventional display device. Use components to reduce costs. Moreover, based on the characteristics of organic light-emitting diodes using blue or violet light for the light-emitting layer, the light-emitting module of the present invention has high light-emitting power and conversion efficiency.

In one embodiment, the present invention discloses a light-emitting module, which includes a transparent substrate, a light-emitting layer, a light-transmitting layer, and a filter layer. The light-emitting layer is arranged on the transparent substrate. The light-transmitting layer is arranged on the light-emitting layer. The filter layer is arranged on the transparent layer superior. The filter layer contains a plurality of quantum dots. The quantum dots have a light color of red, green, blue or any combination of the foregoing colors. One light emitted from the light-emitting layer enters the filter layer to excite the quantum dots to form a light color with a full-color spectrum.

In an example, the above-mentioned light emitting module further includes a light coupling layer disposed on the filter layer.

In an example, the light coupling layer may be a coating layer or a photoresist layer.

In an example, the above-mentioned light-emitting module further includes a polarizing layer disposed on the light coupling layer.

In an example, the above-mentioned light-emitting layer may be an organic light-emitting diode.

In one example, the above-mentioned organic light emitting diode includes an electrode made of a flexible metal.

In one example, the light emitted by the light-emitting layer has a blue or purple light color.

In one example, the above-mentioned quantum dots are stacked on each other in the filter layer to form a plurality of pixel units corresponding to the visible image formed by the light emitted by the light-emitting layer.

In one example, the above-mentioned pixel units are arranged in an array.

In one example, the above-mentioned transparent substrate includes a flexible plastic or a flexible glass.

In one example, the light-transmitting layer includes a flexible plastic or a flexible glass.

In one example, the above-mentioned polarizing layer includes a flexible plastic or a flexible glass.

100: Light-emitting module

110: Transparent substrate

120: luminescent layer

130: light-transmitting layer

140: filter layer

141: Quantum Dots

142: Quantum Dots

143: Quantum Dots

150: optical coupling layer

160: Polarizing layer

Figure 1 is a schematic diagram showing the structure of a light emitting module according to an embodiment of the present invention; and

FIG. 2 is a schematic diagram showing another stacked arrangement of the quantum dots of the light-emitting module in FIG. 1. FIG.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. For the sake of clarity, many practical details will be explained in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings and focus on the main technical features of this case, some conventional and non-essential structures and components will be shown in the drawings in a simple schematic manner or omitted.

Please refer to Figure 1 and Figure 2. FIG. 1 is a schematic diagram showing the structure of a light emitting module 100 according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing another stacked arrangement of the quantum dots 141, 142, and 143 of the light-emitting module 100 in FIG. 1. FIG. The light-emitting module 100 includes a transparent substrate 110, a light-emitting layer 120, a light-transmitting layer 130 and a filter layer 140. The light-emitting layer 120 is disposed on the transparent substrate 110. The light-transmitting layer 130 is disposed on the light-emitting layer 120. The filter layer 140 is disposed on the transparent layer 130. The filter layer 140 includes a plurality of quantum dots 141, 142, and 143. When the light emitted from the light-emitting layer 120 enters the filter layer 140, the light with different light colors is excited After these quantum dots 141, 142, and 143, light colors with full-color spectrum can be formed.

Generally, it can be understood as a color-changing image formed by the naked eye, which is composed of multiple pixel units. Therefore, the quantum dots 141, 142, and 143 can be stacked on each other in the filter layer 140 to form a plurality of pixel units corresponding to the visible image formed by the light emitted by the light-emitting layer 120.

Moreover, the quantum dots 141, 142, and 143 can have a light color of a red, a green, a blue, or any combination of the foregoing colors. In other words, the quantum dots 141, 142, and 143 can have a single red light color, a single green light color, a single blue light color, a combination of red and green light colors, a combination of blue and green light colors, and red And blue light color combination or red, green and blue light color combination. The light and color combinations of the aforementioned quantum dots 141, 142, and 143 can be freely selected according to different usage conditions.

In Figure 1, quantum dots 141 with red light color, quantum dots 142 with green light color, and quantum dots 143 with blue light color are each stacked to form a filter layer 140 and correspond to different pixel units. Using more pixel units of different colors will result in better color saturation and present a richer close to true color reproduction. In addition, the quantum dots 141, 142, and 143 can have different arrangements to form pixel units with different arrangements to form different color saturations. For example, in Figure 1, quantum dots 141 with red light color, quantum dots 142 with green light color, and quantum dots 143 with blue light color are each arranged in an array to form each layer, and then the layers are arranged in different light colors. Each layer is stacked to form a filter layer 140. In Figure 2, there are quantum dots 141 with red light and quantum dots with green light. After each layer 142 and the quantum dots 143 with blue light color are arranged in an array to form each layer, they are staggered on the plane to form the filter layer 140. In addition, the quantum dots 141, 142, and 143 with different light colors can also be arranged in the form of a square array, a triangular array or a mosaic array to form pixel units in different arrangements to achieve different color rendering effects.

The material of the quantum dots 141, 142, and 143 can include II-VI group element compounds, III-V group element compounds, Perovskite quantum dots, and the above-mentioned II-VI group element compounds and/or III-V group element compounds. Core-shell structure compound formed by coating element compound or doped nanocrystalline particles. Among them, II-VI group elements can include cadmium selenide (CdSe), cadmium telluride (CdTe), magnesium sulfide (MgS), magnesium selenide (MgSe), magnesium telluride (MgTe), calcium sulfide (CaS), selenium Calcium (CaSe), Calcium Telluride (CaTe), Strontium Sulfide (SrS), Strontium Selenide (SrSe), Strontium Telluride (SrTe), Barium Sulfide (BaS), Barium Selenide (BaSe), Barium Telluride ( BaTe), zinc sulfide (ZnS), zinc selenide (ZnSe), zinc telluride (ZnTe) or cadmium sulfide (CdS), etc.; III-V group element compounds can include gallium nitride (GaN), gallium phosphide (GaP) ), gallium arsenide (GaAs), indium nitride (lnN), indium phosphide (lnP) or indium arsenide (InAs), etc., but not limited to the above materials.

The aforementioned quantum dots 141, 142, and 143 can be in the form of particles, the particle diameter of which can be between 1 nanometer and 10 nanometers, and the weight ratios of the quantum dots 141, 142, and 143 can be adjusted in different ways to form different pictures.素unit.

The stacked arrangement of the aforementioned quantum dots 141, 142, and 143 can be achieved through chemical colloidal method and self-composition method. (self-assembly method), lithography and etching, or split-gate approach. Through the chemical sol method synthesis, multilayered quantum dots can be produced, the process is simple and suitable for mass production. The self-assembly method can adopt chemical vapor deposition (chemical vapor deposition) process to make quantum dots self-aggregate and grow on the surface of a specific substrate, and can mass produce regularly arranged quantum dots. The lithography and etching method uses light beam or electron beam to directly etch the desired pattern on the substrate. The split-gate approach creates a two-dimensional limitation on the plane of the two-dimensional quantum well by applying an external voltage, which can change the shape and size of the quantum dot.

In the present invention, the light emitted by the light-emitting layer 120 can have a blue or purple light color. After the light emitted by the light-emitting layer 120 passes through the filter layer 140 composed of quantum dots 141, 142, and 143 with different light colors, it is mixed. Not only can the light color of the full-color spectrum be obtained, but also it has good conversion efficiency and luminous power.

The light-transmitting layer 130 can be any one or a combination of a quantum dot film, a polarizing film, a brightness enhancement film, or a diffusion film, so that the shape of the light passing through the light-transmitting layer 130 can be gain-expanded to show uniform surface light emission .

After the light emitted by the light-emitting layer 120 is mixed and emitted by the filter layer 140, a light coupling layer 150 can be disposed on the filter layer 140. The light coupling layer 150 can be a coating layer or a photoresist layer. Through the function of the light coupling layer, the light output can be more uniform and the light gain effect can be achieved.

In order to form the change of brightness (gray scale), a polarizing layer 160 can be provided On the light coupling layer 150. With the polarizing layer 160, the polarization direction of the light penetrating the polarizing layer 160 can be adjusted, the polarization angle can be controlled, and the change of brightness (gray scale) can be controlled, so that the image has contrast and is close to the real image light and shadow changes.

As the development of display devices tends to be light, thin and portable, flexible display devices have also been actively developed. The transparent substrate 110, the light-transmitting layer 120, the polarizing layer 160, etc. in the present invention may each include a flexible plastic or a flexible glass. Furthermore, when an organic diode is used for the light-emitting layer 120, the electrode for power supply can also be made of flexible metal. Therefore, the light-emitting module 100 of the present invention, based on its simple structure and the flexibility of each layer, is particularly suitable for the development of flexible display devices.

Therefore, the light-emitting module 100 disclosed in the present invention can simplify complicated backlight control components and reduce manufacturing costs. Furthermore, compared with the conventional liquid crystal display device, the light-emitting module 100 disclosed in the present invention has a higher power efficiency, a wider viewing angle and a longer life.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be subject to the definition of the attached patent application scope.

100: Light-emitting module

110: Transparent substrate

120: luminescent layer

130: light-transmitting layer

140: filter layer

141: Quantum Dots

142: Quantum Dots

143: Quantum Dots

150: optical coupling layer

160: Polarizing layer

Claims (12)

A light-emitting module, which includes: A transparent substrate; A light-emitting layer disposed on the transparent substrate; A light-transmitting layer disposed on the light-emitting layer; and A filter layer disposed on the transparent layer, the filter layer including a plurality of quantum dots, the quantum dots having a light color of a red, a green, a blue or any combination of the foregoing colors; The light emitting layer emits a light into the filter layer to excite the quantum dots to form a light color with a full-color spectrum. The light-emitting module described in item 1 of the scope of patent application further includes a light coupling layer disposed on the filter layer. According to the light-emitting module described in item 2 of the scope of patent application, the light coupling layer is a coating layer or a photoresist layer. The light-emitting module described in item 2 of the scope of patent application further includes a polarizing layer disposed on the light coupling layer. According to the light-emitting module described in item 1 of the scope of patent application, the light-emitting layer is an organic light-emitting diode. According to the light-emitting module described in item 5 of the scope of patent application, the organic light-emitting diode includes an electrode made of a flexible metal. The light-emitting module according to the first item of the scope of patent application, wherein the light emitted by the light-emitting layer has a blue or a purple light color. According to the light-emitting module described in claim 1, wherein the quantum dots are stacked on each other in the filter layer to form a plurality of pixel units corresponding to the visible image formed by the light emitted by the light-emitting layer. In the light-emitting module described in item 8 of the scope of patent application, the pixel units are arranged in an array. According to the light-emitting module described in claim 1, wherein the transparent substrate includes a flexible plastic or a flexible glass. According to the light-emitting module described in claim 1, wherein the light-transmitting layer includes a flexible plastic or a flexible glass. According to the light-emitting module described in claim 1, wherein the polarizing layer includes a flexible plastic or a flexible glass.

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