TWM545921U - Light source structure and backlight module thereof - Google Patents

Description

Light source structure and backlight module thereof

The present invention relates to a light source system, and more particularly to a light source structure and a backlight module that act on a blue light wafer, a red phosphor powder, and a green quantum dot.

At present, related technologies for applying quantum dots to light emitting diodes have received increasing attention. Materials with three dimensions (length, width, height) below 100 nm are generally referred to as quantum dots (QD). If the material is made into the size of a quantum dot, its electrons are easily excited to change the energy level. The electrons that are excited to change the energy level combine with the hole to emit light. In terms of application, the quantum dot can be integrated into the backlight module, so that when the backlight module is applied to the display panel, a wider color gamut can be realized. There are several ways to integrate quantum dots into backlight modules. The first way is to arrange the film containing the quantum dot material above the light guide plate of the backlight module. Another way is to arrange the tubular member containing the quantum dot material between the light source module of the side-entry backlight module and the light guide plate. However, if the material of the red-green quantum dot film is cadmium selenide (CdSe), the cadmium content exceeds the EU standard and does not meet the environmental protection requirements. In addition, if the material of the red-green light quantum dot film is made of indium phosphide (InP), although there is no cadmium problem, the optical efficiency is low and the color rendering property is inferior to that of cadmium selenide. Therefore, how to reduce the amount of cadmium and maintain optical efficiency and color rendering is one of the focuses of attention in the field.

One of the aims of the present invention is to provide a light source structure and a backlight module that act on a blue light wafer, a red phosphor powder, and a green quantum dot. Another object of the present invention is to provide a red fluorescent powder together with the blue light wafer in an LED light source, the green quantum dot is disposed in a film, and the light source structure and the backlight module of the film outside the LED light source. Another object of the present invention is to provide a backlight module comprising a blue light wafer and a red fluorescent powder for generating a purple light composed of a blue light and a red light, and a green quantum dot film comprising The complex green quantum dots are excited by the blue light in the pink violet light to produce a green light and a white light transmitted through the green quantum dot film. Another object of the present invention is to provide a light source structure and a backlight module that reduce the amount of cadmium or consume power at the same color rendering. In order to achieve the above object, the present invention provides a light source structure, comprising: a light source and a plurality of green quantum dots, the light source having a blue light wafer and a red phosphor, the blue light emitting a blue light, the red fluorescent powder The blue light is received to generate a red light combined with the blue light to form a pink-purple light, and the green quantum dots receive the blue light in the pink-purple light to generate a green light. The present invention further provides a backlight module, comprising: an optical film set; a light source structure comprising: a light source having a blue light wafer to generate a blue light and a red fluorescent powder to receive the blue light to generate a red light, wherein the The blue light is combined with the red light to form a pink purple light; a green quantum dot film is disposed under the optical film group, and includes a plurality of green quantum dots for receiving the blue light in the pink light and converting into green light, and the pink purple light is transmitted through The green quantum dot film combines with the green light to form a white light. In one implementation, the light source is an LED light source and has an encapsulation layer, and the blue wafer and the red phosphor are disposed in the encapsulation layer. In one implementation, the green quantum dots are disposed within a green quantum dot film and the green quantum dot film is outside the light source. In one implementation, the method further includes: a light guide plate is disposed under the green quantum dot film, and the light source is disposed on a side of the light guide plate. In one implementation, the illumination source is disposed beneath the green quantum dot film. In one implementation, the light source structure further includes: a light guide plate disposed under the green quantum dot film, the light source being disposed on a side of the light guide plate. In one implementation, the illumination source is disposed beneath the green quantum dot film. In one implementation, the light source is an LED light source having an encapsulation layer, and the red phosphor powder and the blue light wafer are disposed in the encapsulation layer. In one implementation, the optical film set includes: a reflective polarizing brightness enhancing film, a germanium film, and a diffusion film.

The preferred embodiment of the present invention will be described with reference to the related drawings, in which the same elements will be described with the same element symbols. It is to be noted that the terminology used in the following description is for the purpose of describing the embodiments, and is not intended to limit the exemplary embodiments of the present application. As used herein, the singular """"""""""""""""" There are features, steps, operations, devices, components, and/or combinations thereof. For convenience of description, spatial relative terms such as "above", "above", "on top", "above", etc., can be used here to describe as shown in the figure. The spatial positional relationship of a device or feature to other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation of the device described. For example, if the device in the figures is inverted, it is described as "above other devices or structures" or "under other devices or configurations." Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or at other orientations) and the corresponding description of the space used herein is interpreted accordingly. In the following, the same components will be denoted by the same reference numerals, and different implementations will be denoted by different symbols, and the components that have been described will not be described again. The present invention includes a light source and a plurality of green quantum dots, the light source having a blue light wafer and a red phosphor, the blue light emitting a blue light, the red fluorescent powder receiving the blue light to generate a red light The blue light combines into a pink violet light, and the green quantum dots receive the blue light in the pink violet light to produce a green light combined with the pink violet light to form a white light. The green quantum dots may be disposed in a green quantum dot film, the green quantum dot film being located outside the light source. A more detailed structure is described as follows: Fig. 1A is an exploded schematic view of the first implementation of the creation, and Fig. 1B is a schematic view of the illumination source of the first implementation of the creation. As shown in the figure, the backlight module 10 is of a side-in type, comprising an optical film set 11 and a light source structure 12, the optical film set 11 comprising a reflective polarizing brightness enhancement film (DBEF) 111 and a diaphragm (prism). 112 and a diffusion film 113, the ruthenium film 112 is disposed under the reflective polarization enhancing film 111, and the diffusion film 113 is disposed under the ruthenium film 112. The light source structure 12 includes a light source 121 and a green quantum dot film 122. As shown in FIG. 1B, the light source 121 is, for example, an LED light source, and has a blue wafer 1211 and a red phosphor 1212 disposed in an encapsulation layer 1213. The blue light crystal 1211 of the light source 121 emits a blue light, and the red fluorescent powder 1212 is, for example but not limited to, quaternary manganese Mn ( IV ) , which generates a red light after receiving the blue light, and the red light is combined with the blue light. It is emitted from the light source 121 after it becomes a purple light. The green quantum dot film 122 is disposed under the optical film group 11 and outside the light source 121, and includes a plurality of green quantum dots 1221, such as not only limited to cadmium telluride (CdS), cadmium selenide (CdSe) or phosphating. Indium (InP), inorganic calcium ore quantum dots (CsPb (I/Br)), and the like. A light guide plate 13 is disposed under the green quantum dot film 122. The light source 121 is disposed on a side of the light guide plate 13. The pink light emitted by the light source 121 is guided through the green quantum dot film through the light guide plate 13. 122. A part of the blue light in the pink violet light passing through the green quantum dot film 122 is received by the green quantum dots 1221 and converted into green light, and a part of the pink violet light is combined with the green light to form a white light through the green quantum dot film 122. Optical film set 11. The light guide plate 13 is optionally provided with a reflective film 14 for reflecting light leaking through the light guide plate 13 to the lower surface of the light guide plate 13 to be reflected back to an upper surface of the light guide plate 13 to reduce light loss. Increase the brightness. In an alternative implementation, as shown in FIG. 1C, the backlight module 10a is of a direct type without a light guide plate. The light source 121 is disposed under the green quantum film 122, and above the reflective film 14, the light source is The pink violet light emitted by 121 passes through the green quantum dot film 122, and a part of the blue light in the pink violet light passing through the green quantum dot film 122 is received by the green quantum dots and converted into green light, and a part of the pink violet light passes through the green quantum dot film 122. The white light is combined with the green light to pass through the optical film group 11. In summary, this creation has the following advantages: 1. From the material of quantum dots, cadmium selenide (CdSe), due to the conventional use of red and green quantum dot films combined with blue LEDs, the cadmium content of red quantum dots plus The cadmium content of the green quantum dots makes the total cadmium content exceed the EU standard and does not meet environmental protection requirements. However, the present invention uses a green quantum dot film 122, and additionally uses red phosphor powder 1212 and blue light wafer 1211 in the light source 121. This creation reduces the red quantum dots not only reduces the amount of cadmium, but also reduces the thickness of the quantum dot film. It has both environmental protection and thinning effect. 2. This creation uses red phosphor powder 1212 to replace the red quantum dots of the prior art. Since the efficiency of red fluorescence is better than that of red quantum dots, the red light generated by the illumination source 121 will be more red than the red light produced by the red quantum dots. Good efficiency and color rendering. 3. Compared with the conventional method of replacing indium cadmium (CdSe) with indium phosphide (InP) as a red quantum dot to reduce the cadmium content, the light conversion efficiency is lowered, the brightness is decreased, and the number of LEDs needs to be increased to increase the brightness. Generate power consumption problems. This creation replaces the red quantum dots with red fluorescent powder, which not only reduces the cadmium content, but also does not reduce the light conversion efficiency. It does not need to increase the number of light sources, so it does not consume electricity. Although the present invention is disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present invention. The scope of the patent application is subject to the provisions of the attached patent application.

10, 10a‧‧‧ backlight module
11‧‧‧Optical film group
111‧‧‧Reflective polarizing film
112‧‧‧稜鏡膜
113‧‧‧Diffuser film
12‧‧‧Light source structure
121‧‧‧Light source
1211‧‧‧Blue Wafer
1212‧‧‧Red Fluorescent Powder
1213‧‧‧Encapsulation layer
122‧‧‧Green quantum dot film
1221‧‧‧Green Quantum Dots
13‧‧‧Light guide plate
14‧‧‧Reflective film

The following figures are intended to make the present invention easier to understand, and the drawings are described in detail herein and form part of the specific embodiments. Through the specific embodiments herein and with reference to the corresponding drawings, the specific embodiments of the present invention are explained in detail, and the function principle of the creation is explained. 1A is a schematic diagram of the first implementation of the creation; FIG. 1B is a schematic diagram of the illumination source of the first implementation of the creation; FIG. 1C is a schematic diagram of the second implementation of the creation.

10‧‧‧Backlight module

11‧‧‧Optical film group

111‧‧‧Reflective polarizing film

112‧‧‧稜鏡膜

113‧‧‧Diffuser film

12‧‧‧Light source structure

121‧‧‧Light source

122‧‧‧Green quantum dot film

1221‧‧‧Green Quantum Dots

13‧‧‧Light guide plate

14‧‧‧Reflective film

Claims (10)

A light source structure includes: a light source and a plurality of green quantum dots, the light source having a blue light wafer and a red phosphor, the blue light emitting a blue light, the red fluorescent powder receiving the blue light to generate a red The light is combined with the blue light to form a pink-purple light, and the green quantum dots receive the blue light in the pink-purple light to generate a green light, and the pink-violet light is combined with the green light to form a white light through the green quantum dot film. The light source structure of claim 1, wherein the light source is an LED light source and has an encapsulation layer, and the blue wafer and the red phosphor are disposed in the encapsulation layer. The light source structure of claim 2, wherein the green quantum dots are disposed in a green quantum dot film, and the green quantum dot film is outside the light source. The light source structure of claim 3, further comprising: a light guide plate disposed under the green quantum dot film, the light source being disposed on a side of the light guide plate. The light source structure of claim 3, wherein the light source is disposed under the green quantum dot film. A backlight module includes: an optical film set; a light source structure comprising: a light source having a blue light system for generating a blue light and a red fluorescent powder system for receiving the blue light to generate a red light, and the red light The light is combined with the blue light to form a pink purple light; a green quantum dot film is disposed under the optical film group, and includes a plurality of green quantum dots for receiving blue light in the pink light and converting into green light, and the pink purple light passes through the light The green quantum dot film combines with the green light to form a white light. The backlight module of claim 6, wherein the light source structure further comprises: a light guide plate disposed under the green quantum dot film, the light source being disposed on a side of the light guide plate. The backlight module of claim 6, wherein the light source is disposed under the green quantum dot film. The backlight module of claim 6 or 7 or 8, wherein the light source is an LED light source having an encapsulation layer, and the red phosphor and the blue light wafer are disposed in the encapsulation layer. The backlight module of claim 6, wherein the optical film set comprises: a reflective polarizing brightness enhancement film, a germanium film, and a diffusion film.