TWM618034U - Light source module and display device - Google Patents

Abstract

A light source module includes a substrate, a plurality of light-emitting elements and a quantum dot film. The substrate has a bearing surface, and the plurality of light-emitting elements are disposed on the bearing surface. Each light-emitting element includes a first light-emitting chip and a second light-emitting chip. The first light-emitting chip is adapted to emit blue light. The second light-emitting chip is disposed beside the first light-emitting chip and is adapted to emit red light. The quantum dot film is disposed on the bearing surface and is adapted to convert blue light into green light. The plurality of light-emitting elements are located between the substrate and the quantum dot film. A display device of the invention is further provided.

Description

Light source module and display device

This creation relates to a light source module, and in particular to a light source module that can be used in a display device and a display device using the light source module.

The liquid crystal display device includes a liquid crystal display panel and a backlight module. Since the liquid crystal display panel itself does not emit light, it is necessary to rely on the backlight module to provide the display light source to the liquid crystal display panel. Therefore, the main function of the backlight module is to provide a high-brightness and high-uniformity display light source.

Traditionally, backlight modules can be divided into edge-type backlight modules and direct-type backlight modules. Generally speaking, the light-emitting element used in the direct-lit backlight module will add phosphor into the packaged light-emitting diode (LED) chip, so that the original light and the converted light after the phosphor conversion are mixed to form a uniform Mixed white light.

However, since the reaction time of the light-emitting diode chip is only tens of nanoseconds (nanosecond), while the reaction time of the phosphor is tens of milliseconds, the pixel switching of the liquid crystal display panel is converted by the phosphor. The converted light will have a delay in response time, and then form a smear phenomenon on the display screen.

This "prior art" paragraph is only used to help understand the content of this creation, so the content disclosed in the "prior art" may contain some conventional technologies that do not constitute the knowledge of those with ordinary knowledge in the technical field. In addition, the content disclosed in the "prior art" does not represent The content or the problem to be solved by one or more embodiments of this creation does not mean that it has been known or recognized by those with ordinary knowledge in the technical field before this creation application.

This creation provides a light source module that can improve the uniformity of light.

This creation provides a display device that can reduce the smear phenomenon on the display screen.

Other purposes and advantages of this creation can be further understood from the technical features disclosed in this creation.

In order to achieve one or part or all of the above-mentioned purposes or other purposes, the light source module provided by an embodiment of the present creation includes a substrate, a plurality of light-emitting elements, and a quantum dot film. The substrate has a bearing surface, and a plurality of light-emitting elements are arranged on the bearing surface. Each light-emitting element includes a first light-emitting chip and a second light-emitting chip. The first light-emitting chip is suitable for emitting blue light. The second light-emitting chip is arranged beside the first light-emitting chip and is suitable for emitting red light. The quantum dot film is arranged on the carrying surface, and a plurality of light-emitting elements are located between the substrate and the quantum dot film. The quantum dot film is suitable for converting blue light into green light.

In an embodiment of the present invention, each of the above-mentioned light-emitting elements further includes a cup-shaped reflective structure having an opening, a bottom and a reflective side surface. The first light-emitting chip and the second light-emitting chip are arranged at the bottom, and the reflective side surface is connected to the opening and the bottom. And surround the first light-emitting chip and the second light-emitting chip.

In an embodiment of the present creation, the maximum width of the aforementioned opening is greater than the maximum width of the bottom, the reflective side surface is inclined with respect to the bearing surface, and the angle between the reflective side surface and the bearing surface is 0°-60°.

In an embodiment of the present creation, the wavelength range of the light emitted by the first light-emitting chip is 440nm~460nm, and the wavelength range of the light emitted by the second light-emitting chip is 620nm~645nm.

In an embodiment of the present creation, the above-mentioned light source module further includes a dichroic lens, which is arranged between the plurality of light-emitting elements and the quantum dot film.

In an embodiment of the present invention, the above-mentioned multiple light-emitting elements are arranged in an array on the carrying surface.

In an embodiment of the present invention, the above-mentioned light source module further includes at least one optical film, which is disposed on the side of the quantum dot film away from the substrate.

In order to achieve one or part or all of the above-mentioned purposes or other purposes, the display device provided by an embodiment of the invention includes a display panel and the above-mentioned light source module. The display panel is arranged on the light emitting side of the light source module.

In an embodiment of the present invention, the above-mentioned display device further includes a control circuit for controlling the switch of each light-emitting element according to time sequence.

In an embodiment of the present creation, the above-mentioned display device further includes a control circuit, the display panel has a plurality of pixels, and each light-emitting element corresponds to a part of these pixels, and the control circuit is used to control the pixels according to time sequence. Part of the switch.

In the light source module of this creative embodiment, each light-emitting element includes a first light-emitting chip suitable for emitting blue light and a second light-emitting chip suitable for emitting red light, and part of the blue light is converted into green light through the quantum dot film. The emitted light can be mixed into white light. Since the light source module of this creative embodiment directly uses the second light-emitting chip suitable for emitting red light, the reaction time of the first light-emitting chip and the second light-emitting chip are roughly the same, which is compared with the conventional one. In the prior art, fluorescent powder is used to convert blue light into red light. The light source module of this creative embodiment is not prone to delay in the conversion reaction time of the fluorescent powder. The light of each color can be uniformly mixed into white light, so the light uniformity can be improved. . Since the display device of this creative embodiment uses the above-mentioned light source module, the smear phenomenon on the display screen can be reduced.

In order to make the above and other purposes, features and advantages of this creation more obvious and easy to understand, the following is a detailed description of preferred embodiments in conjunction with the accompanying drawings.

1, 1a, 1b: display device

10, 10a, 10b: light source module

20: display panel

30: control circuit

100: substrate

110: bearing surface

200, 200a: light-emitting element

210: The first light-emitting chip

220: The second light-emitting chip

230: Cup-shaped reflective structure

231: open

232: bottom

233: reflection side

300: Quantum dot film

400, 410, 420, 430: optical film

500: Dichroic lens

L: Surface light source

Lb: Blu-ray

Lg: green light

Lr: red light

W1, W2: width

θ: Angle

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the invention.

2A is a schematic cross-sectional view of a display device according to another embodiment of the invention.

FIG. 2B is a schematic cross-sectional view of a light-emitting element according to another embodiment of the creation.

FIG. 3 is a schematic cross-sectional view of a display device according to another embodiment of the invention.

FIG. 4 is a block diagram of a display device according to an embodiment of the creation.

The aforementioned and other technical content, features and effects of this creation will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit this creation.

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the invention. Please refer to FIG. 1, the display device 1 of this embodiment includes a light source module 10 and a display panel 20. The light source module 10 includes a substrate 100, a plurality of light emitting elements 200 and a quantum dot film 300. The substrate 100 has a carrying surface 110, and a plurality of light-emitting elements 200 are disposed on the carrying surface 110. Each light-emitting element 200 includes, for example, a first light-emitting chip 210 and a second light-emitting chip 220. In this embodiment, the first light-emitting chip 210 is suitable for emitting blue light Lb, for example. The second light-emitting chip 220 is disposed beside the first light-emitting chip 210, and is suitable for emitting red light Lr, for example. The quantum dot film 300 is disposed on the carrying surface 110. In order to clearly describe the creation, the quantum dot film 300 is shown separately from the substrate 100 in FIG. 1, and a plurality of light-emitting elements 200 are located on the substrate 100 and the quantum dot film 300. between. The quantum dot film 300 is suitable for converting blue light Lb into green light Lg, for example. This embodiment is only one of multiple implementation modes, and the present creation does not specifically limit the color of light emitted by the first light-emitting chip 210 and the second light-emitting chip 220, nor does it limit the color of the light converted by the quantum dot film 300. The display panel 20 is disposed on the light emitting side of the light source module 10. Specifically, for example, it is arranged on the side of the quantum dot film 300 away from the substrate 100. The display panel 20 can be a liquid crystal display panel or other non-self-luminous display panels. The type of the liquid crystal display panel can be a transmissive display panel or a transflective display panel, and the light source module 10 is used to provide light to the display panel 20.

In this embodiment, the wavelength range of the blue light Lb emitted by the first light-emitting chip 210 is, for example, 440 nm to 460 nm, and the wavelength range of the red light Lr emitted by the second light-emitting chip 220 is, for example, 620 nm to 645 nm. The wavelength range of the converted green light Lg is, for example, from 520 nm to 550 nm, but it is not limited to this. According to different design requirements, the wavelength range of the light emitted by the first light-emitting chip 210 and the second light-emitting chip 220 or the wavelength range of the light converted by the quantum dot film 300 can be adjusted.

Taking this embodiment as an example, green quantum dots are arranged in the quantum dot film 300. Since the green quantum dots will only react with light of a specific wavelength, such as blue light Lb with a wavelength of 440nm~460nm in this embodiment, it should be The red light Lr emitted by the second light-emitting chip 220 passes through the quantum dot film 300 and does not react to convert the red light Lr. Therefore, the light emitted from the quantum dot film 300 includes the blue light Lb and the blue light emitted by the first light-emitting chip 210. The green light Lg converted from part of the blue light Lb and the red light Lr emitted by the second light-emitting chip 220 can be further mixed into white light.

The first light-emitting chip 210 and the second light-emitting chip 220 may be light-emitting chips that are cut directly from a wafer and are not packaged, such as light-emitting diode chips. For example, the first light-emitting chip 210 is, for example, a grain-level nitride light-emitting diode chip that emits blue light at a dominant wavelength, but it is not limited thereto. The number of light-emitting elements 200 in FIG. 1 is three as an example, but the present invention does not particularly limit the number of light-emitting elements 200. In this embodiment, each light-emitting element 200 includes, for example, a first light-emitting crystal. The chip 210 and a second light-emitting chip 220 are not limited thereto. In other embodiments, each light-emitting element 200 may include a plurality of first light-emitting chips 210 and/or a plurality of second light-emitting chips 220, which are electrically connected to the substrate 100 in series or parallel. In addition, the light-emitting elements 200 are arranged in an array on the carrying surface 110, for example, but not limited to this.

The substrate 100 is, for example, a printed circuit board, which may be a rigid board or a flexible board, which is used to carry a plurality of light-emitting elements 200 and a quantum dot film 300, and drives the plurality of light-emitting elements 200 to emit light through the substrate 100. The rigid board is, for example, a metal core printed circuit board (MCPCB) or a copper foil substrate (such as an FR4 substrate).

The light source module 10 of this embodiment, for example, further includes at least one optical film 400 disposed on the side of the quantum dot film 300 away from the substrate 100. The at least one optical film 400 is, for example, a polarized brightness enhancement film, a diffusion film, a thin film or a composite film, etc., but it is not limited thereto. The present invention does not limit the number of at least one optical film 400, which can be one or more sheets. In this embodiment, three optical films 410, 420, and 430 are taken as an example. In addition, depending on the function of the optical film, the optical films 410, 420, and 430 may also be of different types.

In the light source module 10 of this embodiment, each light-emitting element 200 includes a first light-emitting chip 210 suitable for emitting blue light Lb and a second light-emitting chip 220 suitable for emitting red light Lr, and part of the blue light Lb passes through the quantum dot film. 300 is converted into green light Lg, so the emitted light can be mixed into white light. Because the light source module 10 of this embodiment directly uses the second light-emitting chip 220, the first light-emitting chip 210 and the second light-emitting chip suitable for emitting red light Lr The response time of 220 is approximately the same. Compared with the conventional technology that uses phosphor to convert blue light into red light, the light source module 10 of this embodiment is not prone to delay the conversion reaction time of phosphor. It can be uniformly mixed into white light, so the light uniformity can be improved. Since the display device 1 of this embodiment uses the light source module 10, the smear phenomenon on the display screen can be reduced.

2A is a schematic cross-sectional view of a display device according to another embodiment of the invention. FIG. 2B is a schematic cross-sectional view of a light-emitting element according to another embodiment of the creation. Please refer to FIG. 2A and FIG. 2B. The structure and advantages of the display device 1a of this embodiment and the above-mentioned display device 1 are similar, and only the main differences of the structure are described below. In the display device 1a of this embodiment, each light-emitting element 200a of the light source module 10a further includes a cup-shaped reflective structure 230, the material of which is, for example, a white reflective colloid, but it is not limited thereto. The cup-shaped reflective structure 230 has, for example, an opening 231, a bottom 232 and a reflective side surface 233. The first light-emitting chip 210 and the second light-emitting chip 220 are disposed on the bottom 232. The reflective side surface 233 connects the opening 231 and the bottom 232 and surrounds the first light-emitting chip 210 and the second light-emitting chip 220.

In this embodiment, the maximum width W1 of the opening 231 is greater than the maximum width W2 of the bottom 232, and the reflective side surface 233 is inclined with respect to the carrying surface 110. Specifically, the reflective side surface 233 is inclined outward from the bottom 232 toward the opening 231, and the included angle θ between the reflective side surface 233 and the carrying surface 110 is, for example, 0°-60°. Since the blue light Lb of the first light-emitting chip 210 and the red light Lr of the second light-emitting chip 220 are likely to cause halo chromatic aberration when light is emitted at the same time, the configuration of the cup-shaped reflective structure 230 allows the first light-emitting chip 210 to emit toward both sides The blue light Lb and the red light Lr emitted from the second light-emitting chip 220 to both sides can be mixed before being reflected by the reflective side surface 233 (as shown in FIG. 2B) to reduce chromatic aberration, and due to the inclined direction of the reflective side surface 233 The bottom 232 is inclined outward toward the opening 231, so that the reflected light can be concentrated and emitted in the forward direction, which improves the light extraction efficiency of the light emitting element 200a.

FIG. 3 is a schematic cross-sectional view of a display device according to another embodiment of the invention. 3, the display device 1b of this embodiment and the above-mentioned display device 1 have similar structures and advantages. The only difference is that in the display device 1b of this embodiment, the light source module 10b further includes a dichroic lens 500, which is arranged in multiple Between each light-emitting element 200 and the quantum dot film 300. Generally speaking, the dichroic lens 500 is suitable for passing light of certain wavelengths and reflecting light of other wavelengths. In this embodiment, the dichroic lens 500 is designed to pass the blue light Lb of the first light-emitting chip 210 and the red light Lr of the second light-emitting chip 220, and The green light Lg converted by the quantum dot film 300 is reflected, but not limited to this. When part of the blue light Lb hits the green quantum dots in the quantum dot film 300 and is converted into green light Lg, some of the green light Lg is emitted toward the direction of the substrate 100. Therefore, in the multiple light emitting elements 200 and quantum dots A dichroic lens 500 is arranged between the films 300, which can reflect these parts of the green light Lg back into the quantum dot film 300, and then emit light after mixing with other colored lights. Therefore, the arrangement of the dichroic lens 500 can further improve the light output efficiency of the light emitting element 200 and the light source module 10b. The dichroic lens 500 of this embodiment can also be used in conjunction with the above-mentioned cup-shaped reflective structure 230, and the present invention does not limit the combination of the components.

FIG. 4 is a block diagram of a display device according to an embodiment of the creation. Please refer to FIG. 1 and FIG. 4, the display device 1 of this embodiment further includes, for example, a control circuit 30. The light source module 10 is suitable for providing a uniformly mixed surface light source L to the display panel 20. The display panel 20 has a plurality of pixels (not shown), and each light-emitting element 200 in the light source module 10 corresponds to a part of the plurality of pixels, for example. The control circuit 30 is adapted to control each light-emitting element 200 and a plurality of pixels, respectively, and the control circuit 30 is used to control the switch of each light-emitting element 200 and a part of the plurality of pixels in a time sequence. As described above, the first light-emitting chip 210 and the second light-emitting chip 220 in each light-emitting element 200 can be electrically connected to the substrate 100 in a series or parallel manner. Therefore, the control circuit 30 can control the output of each light-emitting element 200. The color light color corresponds to a part of multiple pixels. When these pixels are turned on, the adjusted color light will be displayed on the display screen. When these pixels are turned off, it will not be displayed on the display screen, and then on the whole display screen. Up to achieve the effect of dynamic area dimming.

In summary, in the light source module of this creative embodiment, each light-emitting element includes a first light-emitting chip suitable for emitting blue light and a second light-emitting chip suitable for emitting red light, and part of the blue light is converted into green through the quantum dot film. Therefore, the emitted light can be mixed into white light. Because the light source module of this creative embodiment directly uses the second light-emitting chip suitable for emitting red light, the reaction time of the first light-emitting chip and the second light-emitting chip are roughly the same, Compared with the conventional technology that uses phosphors to convert blue light into red light, the light source module of this creative embodiment is not easy to have the conversion reaction of phosphors In the case of time delay, the light of each color can be uniformly mixed into white light, so the light uniformity can be improved. In addition, in the embodiment where the cup-shaped reflection structure or the dichroic lens is configured, the light source module can further improve the light extraction efficiency. Since the display device of this creative embodiment uses the above-mentioned light source module, the smear phenomenon on the display screen can be reduced, and through the control of the control circuit, the effect of dynamic area dimming can be achieved on the whole display screen.

However, the above are only the preferred embodiments of this creation, and should not be used to limit the scope of implementation of this creation, that is, simple equivalent changes and modifications made according to the scope of patent application and new description of this creation, All are still within the scope of this creation patent. In addition, any embodiment of the creation or the scope of the patent application does not have to achieve all the purposes or advantages or features disclosed in the creation. In addition, the abstract part and title are only used to assist the search of patent documents, not to limit the scope of rights of this creation. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element (element) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. Upper or lower limit.

1: display device

10: Light source module

20: display panel

100: substrate

110: bearing surface

200: light-emitting element

210: The first light-emitting chip

220: The second light-emitting chip

300: Quantum dot film

400, 410, 420, 430: optical film

Lb: Blu-ray

Lg: green light

Lr: red light

Claims (10)

A light source module includes: a substrate with a bearing surface; a plurality of light-emitting elements arranged on the bearing surface, each of the light-emitting elements includes: a first light-emitting chip suitable for emitting blue light; and a second A light-emitting chip is arranged beside the first light-emitting chip and is suitable for emitting red light; and a quantum dot film is arranged on the carrying surface, the light-emitting elements are located between the substrate and the quantum dot film, the quantum dot The film is suitable for converting blue light into green light. The light source module according to claim 1, wherein each of the light-emitting elements further includes a cup-shaped reflective structure having an opening, a bottom and a reflective side surface, and the first light-emitting chip and the second light-emitting chip are disposed on the At the bottom, the reflective side connects the opening and the bottom, and surrounds the first light-emitting chip and the second light-emitting chip. The light source module according to claim 2, wherein the maximum width of the opening is greater than the maximum width of the bottom, the reflective side surface is inclined with respect to the bearing surface, and the angle between the reflective side surface and the bearing surface is 0° ~60°. The light source module according to claim 1, wherein the wavelength range of the light emitted by the first light-emitting chip is 440nm~460nm, and the wavelength range of the light emitted by the second light-emitting chip is 620nm~645nm. The light source module according to claim 1, further comprising a dichroic lens arranged between the light-emitting elements and the quantum dot film. The light source module according to claim 1, wherein the light-emitting elements are arranged in an array on the carrying surface. The light source module according to claim 1, further comprising at least one optical film disposed on a side of the quantum dot film away from the substrate. A display device includes: a light source module, including: a substrate with a bearing surface; a plurality of light-emitting elements arranged on the bearing surface, each of the light-emitting elements includes a first light-emitting chip and a second light-emitting chip Chip, the first light-emitting chip is suitable for emitting blue light, the second light-emitting chip is arranged beside the first light-emitting chip and is suitable for emitting red light; and a quantum dot film is arranged on the carrying surface, the light-emitting elements Located between the substrate and the quantum dot film, the quantum dot film is suitable for converting blue light into green light; and a display panel is arranged on a light emitting side of the light source module. The display device according to claim 8, further comprising a regulating circuit for controlling the switch of each of the light-emitting elements according to a timing sequence. The display device according to claim 9, wherein the display panel has a plurality of pixels, each of the light-emitting elements corresponds to a part of the pixels, and the control circuit is used to control the pixels in a time sequence Of that part of the switch.

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