Light source module and display device
By designing a light source module containing an optimized diffusion layer in a vehicle display, the problem of degradation of infrared light sensor sensing effect is solved, and better driver monitoring effect is achieved.
Patent Information
- Application Number
- CN202411519677.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-06-25
- Filing Date
- 2024-10-29
- Publication Date
- 2025-02-18
AI Technical Summary
The infrared light sensor provided in a vehicle display decreases the sensing effect due to the diffusion effect of the diffusion layer, making it difficult to effectively monitor the driver's eye state.
A light source module is designed, including a substrate, a plurality of first light sources, a first sensor, and a diffusion layer. The diffusion layer is composed of diffused particles with an average particle size of 200-500 nm. The scattering effect on visible light is greater than the scattering effect on invisible light, thereby optimizing the sensing effect of the infrared light sensor.
By optimizing the scattering characteristics of the diffusion layer, the sensing effect of the infrared light sensor is significantly improved, the attenuation of invisible light is reduced, and better driver monitoring is achieved.
Smart Images
Figure CN119472113A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a light source module and a display device. Background Art
[0002] If the mental state is not good while driving, it is easy to lead to unsafe situations. In order to avoid this situation, an infrared light sensor such as an infrared camera can be installed on the dashboard to monitor the driver's physiological characteristics such as whether the driver's eyes are closed.
[0003] On the other hand, with the development of technology, displays have been widely used in various electronic products, and the use of car displays is becoming more and more common. For the sake of aesthetics, some designs place infrared light sensors behind the screen of car displays. However, since the diffusion layer generally included in the display also has a diffusion effect on infrared light, it will reduce the sensing effect of the infrared light sensor placed behind the screen, so there is room for improvement. Summary of the invention
[0004] An object of the present invention is to provide a light source module, wherein the invisible light sensor included in the light source module has a better sensing effect.
[0005] The object of the present invention is to provide a display device which is conducive to the design of narrow frame.
[0006] The light source module of the present invention comprises a substrate, a plurality of first light sources, a first sensor and a diffusion layer. The substrate comprises a first surface. The plurality of first light sources are arranged in a first region of the first surface and emit visible light. The first sensor is arranged in the first region of the first surface and can sense invisible light between the plurality of first light sources. The diffusion layer is arranged on one side of the first surface of the substrate and comprises a plurality of diffusion particles with an average particle diameter within a first range, wherein the scattering effect of the diffusion particles on the visible light is greater than the scattering effect on the invisible light.
[0007] In one embodiment, the invisible light is infrared light.
[0008] In one embodiment, the visible light is blue light.
[0009] In one embodiment, the first range is 200-500 nm.
[0010] In one embodiment, the light source module further includes a color light conversion layer disposed on the other side of the diffusion layer relative to the substrate. The color light conversion layer includes a plurality of quantum dots. After receiving visible light, the quantum dots are excited to emit red light and green light.
[0011] In one embodiment, there is a gap between the diffusion layer and the substrate.
[0012] In one embodiment, the diffusion layer is disposed on the first surface and covers the first light source and the first sensor.
[0013] In one embodiment, the light source module further includes a color light conversion layer disposed on a surface of the diffusion layer facing the substrate. The color light conversion layer includes a plurality of quantum dots. After receiving visible light, the quantum dots are excited to emit red light and green light.
[0014] In one embodiment, the visible light is white light.
[0015] In one embodiment, the first range is 350-500 nm.
[0016] In one embodiment, the light source module further includes a second light source, which is disposed in or outside the first area of the first surface and emits invisible light.
[0017] The display device of the present invention comprises the light source module and a panel module arranged on the other side of the diffusion layer relative to the substrate. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 FIG. 4 is a schematic diagram of an embodiment of a light source module and a display device according to the present invention.
[0019] Figure 2A Schematic diagram of the relationship between scattering intensity and particle size / wavelength.
[0020] Figure 2B Schematic diagram of the relationship between the scattering intensity of blue light and infrared light and the diameter of the diffused particles.
[0021] Figure 3 Schematic diagrams of different embodiments of the present invention in which the color light conversion layer is disposed on a surface of the diffusion layer facing the substrate.
[0022] Figure 4 Schematic diagrams of different embodiments of the present invention in which the diffusion layer is disposed on the first surface and covers the first light source and the first sensor.
[0023] Figure 5A Schematic diagrams of different embodiments of the present invention in which the visible light is white light.
[0024] Figure 5B Schematic diagram of the relationship between the scattering intensity of blue light, white light and infrared light and the diffusion particle diameter.
[0025] Wherein, the reference numerals are:
[0026] 100: Substrate
[0027] 110: First surface
[0028] 111: First Area
[0029] 200: First Light Source
[0030] 220: Second light source
[0031] 300: First sensor
[0032] 410: Diffusion layer
[0033] 411: Diffuse particles
[0034] 420: Color light conversion layer
[0035] 421: Quantum dots
[0036] 422: Quantum dots
[0037] 500: Panel module
[0038] 501: Display surface
[0039] 510a: Visible area
[0040] 510: Optical film layer
[0041] 520: LCD module
[0042] 800: Light source module
[0043] 900: Display device DETAILED DESCRIPTION
[0044] The following is a specific embodiment and a diagram to illustrate the implementation of the connection assembly disclosed in the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. However, the content disclosed below is not intended to limit the scope of protection of the present invention. Without deviating from the principle of the spirit of the present invention, those skilled in the art can implement the present invention with other different embodiments based on different viewpoints and applications. In the accompanying drawings, the thickness of layers, films, panels, regions, etc. is magnified for clarity. Throughout the specification, the same reference numerals represent the same elements. It should be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to another element, or an intermediate element can also exist. On the contrary, when an element is referred to as being "directly on" or "directly connected to" another element, there is no intermediate element. As used herein, "connection" can refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" can be the presence of other elements between two elements.
[0045] It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and / or portions, these elements, components, regions, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or portion from another element, component, region, layer or portion. Therefore, the "first element", "component", "region", "layer" or "portion" discussed below may be referred to as a second element, component, region, layer or portion without departing from the teachings of this document.
[0046] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown in the figures. It should be understood that relative terms are intended to include different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one figure is turned over, the elements described as being on the "lower" side of the other elements will be oriented on the "upper" side of the other elements. Therefore, the exemplary term "lower" can include both "lower" and "upper" orientations, depending on the particular orientation of the figure. Similarly, if the device in one figure is turned over, the elements described as being "below" or "beneath" other elements will be oriented as being "above" the other elements. Therefore, the exemplary terms "below" or "below" can include both above and below orientations.
[0047] As used herein, "about", "approximately", or "substantially" includes the stated value and an average value within an acceptable deviation range of a particular value determined by one of ordinary skill in the art, taking into account the measurement in question and the particular amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", or "substantially" can select a more acceptable deviation range or standard deviation depending on the optical property, etching property or other property, and can apply to all properties without one standard deviation.
[0048] like Figure 1In the embodiment shown, the light source module 800 of the present invention includes a substrate 100, a plurality of first light sources 200, a first sensor 300 and a diffusion layer 410. The substrate 100 includes a first surface 110. The plurality of first light sources 200 are disposed in a first area 111 of the first surface 110 to emit visible light. More specifically, the substrate 100 includes a printed circuit board, and the plurality of first light sources 200 are respectively electrically connected to circuits arranged on the first surface 110. The first sensor 300 is disposed in the first area 111 of the first surface 110, and can sense invisible light between the plurality of first light sources 200. Among them, the first sensor 300 can be disposed through the substrate 100 or on the surface of the substrate 100. On the other hand, the light source module 800 can further include a second light source 220 to emit invisible light. In the example Figure 1 In the illustrated embodiment, the second light source 220 is disposed in the first region 111 of the first surface 110. However, in different embodiments, the second light source 220 may be disposed outside the first region 111 of the first surface 110 (not shown).
[0049] The diffusion layer 410 is disposed on one side of the first surface 110 of the substrate 100, and includes a plurality of diffusion particles 411 with an average particle size within a first range. The plurality of diffusion particles 411 have a greater scattering effect on visible light than on invisible light. Accordingly, the visible light emitted by the plurality of first light sources 200 can be fully diffused by the diffusion particles 411, thereby reducing the occurrence of mura and other conditions. At the same time, since the diffusion particles 411 have a weaker scattering effect on invisible light, the attenuation of the invisible light through the diffusion layer 410 can be reduced, thereby enabling the first sensor 300 to have a better sensing effect.
[0050] Furthermore, the scattering effect of the plurality of diffusion particles 411 on visible light is greater than the scattering effect on invisible light, which can be achieved by making the average particle size of the diffusion particles 411 within the first range. Figure 2A In the embodiment shown, when the value of particle size / wavelength is greater than about 1, it belongs to Mie scattering, and the scattering intensity is near 1, that is, it has a better scattering effect. In contrast, when the value of particle size / wavelength is less than about 1, it belongs to Rayleigh scattering, and the scattering intensity gradually decreases as the value of particle size / wavelength decreases, that is, the scattering effect gradually weakens. In other words, if it is desired to achieve that the scattering effect of the diffusion particles 411 on visible light is greater than the scattering effect on invisible light, the average particle size of the diffusion particles 411 can be within the first range, and the value of the first range / wavelength of visible light is greater than about 1, and the value of the first range / wavelength of invisible light is less than about 1.
[0051] More specifically, in one embodiment, the invisible light is infrared light with a wavelength of, for example, 940 nm, the first light source 200 is a blue light emitting diode (LED), the visible light is blue light with a wavelength of, for example, 450 nm, and the first range is 200-500 nm. Figure 2B In the embodiment shown, the diffusion particles 411 with an average particle size in the first range of 200-500 nm have a significantly higher diffusion scattering intensity for blue light than for infrared light. Therefore, by selecting diffusion particles 411 with an average particle size in the range of 200-500 nm, the diffusion layer 410 can have a significantly better scattering effect for blue light than for infrared light.
[0052] On the other hand, the light source module 800 can further form the display device 900 of the present invention with the panel module 500. The panel module 500 includes an optical film layer 510 and a liquid crystal module 520. The panel module 500 has a display surface 501 on one side facing outward, and the display surface 501 defines a visible area 510a. The vertical projection of the visible area 510a on the first surface 110 preferably overlaps with the first area 111. In other words, the plurality of first light sources 200 and the first sensor 300 are preferably arranged within the range of the vertical projection of the visible area 510a on the first surface 110. Among them, since the scattering effect of the diffusion particles 411 of the light source module 800 on visible light is greater than the scattering effect on invisible light, the visible light emitted by the plurality of first light sources 200 can be fully acted on by the diffusion particles 411 and diffused well, and at the same time, the attenuation of the invisible light through the diffusion layer 410 can be reduced. Therefore, the first sensor 300 can be arranged between the plurality of first light sources 200 and still have a good sensing effect. Viewed from different angles, the first sensor 300 for sensing invisible light can be directly disposed within the visible area 510 a within the vertical projection range of the first surface 110 , which is beneficial to the design of narrowing the frame.
[0053] like Figure 1 In the embodiment shown, the light source module 800 further includes a color light conversion layer 420, which is disposed on the other side of the diffusion layer 410 relative to the substrate 100. The color light conversion layer 420 includes a plurality of quantum dots 421, 422. After receiving visible light such as blue light, the quantum dots 421, 422 are excited to emit red light and green light, which together with the blue light form white light and are emitted to the panel module 500. Furthermore, the quantum dots 421, 422 may include elements such as zinc, chromium, selenium, and sulfur, and may have diameters of 6nm and 2.5nm, which may be excited to emit red light and green light, respectively. Figure 3 In the different embodiments shown, based on considerations of design or manufacturing, the color light conversion layer 420 may be disposed on a surface of the diffusion layer 410 facing the substrate 100 .
[0054] In such Figure 1 In the embodiment shown, there is a gap between the diffusion layer 410 and the substrate 100. More specifically, the diffusion layer 410 is not in contact with the substrate 100, the plurality of first light sources 200, and the first sensor 300. Figure 4 In the different embodiments shown, based on considerations of design or manufacturing, the diffusion layer 410 is disposed on the first surface 110 and covers the first light source 200 and the first sensor 300 .
[0055] In the above embodiment, the first light source 200 is a blue light emitting diode (LED), and the visible light is blue light with a wavelength of, for example, 450nm. The light source module 800 further includes a color light conversion layer 420, in which the quantum dots 421 and 422 are excited to emit red light and green light after receiving the visible light, for example, blue light, to form white light together with the blue light and emit to the panel module 500. However, in the case of Figure 5A In the different embodiments shown, the visible light is white light with a wavelength of, for example, 450 to 630 nm, that is, the first light source 200 is, for example, a white light emitting diode, and the color light conversion layer can be omitted. The diffusion layer 410 includes a plurality of diffusion particles 411 with an average particle size within a first range of 350 to 500 nm. Figure 5B In the embodiment shown, the diffusion particles 411 with an average particle size in the first range of 350-500 nm have a significantly higher diffusion scattering intensity for white light than for infrared light. Therefore, by selecting the diffusion particles 411 with an average particle size in the range of 350-500 nm, the diffusion layer 410 can have a significantly better scattering effect for white light than for infrared light.
[0056] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalent settings included in the spirit and scope of the claims are all included in the scope of the present invention.
Claims
1. A light source module, characterized in that: Include: A substrate comprising a first surface; A plurality of first light sources are disposed in a first area of the first surface and emit visible light; a first sensor disposed in the first area of the first surface and between the first light sources, capable of sensing an invisible light; and A diffusion layer is disposed on one side of the first surface of the substrate, and comprises a plurality of diffusion particles with an average particle diameter within a first range. The diffusion particles have a greater scattering effect on the visible light than on the invisible light.
2. The light source module according to claim 1, wherein: The invisible light is infrared light.
3. The light source module according to claim 2, wherein: The visible light is blue light.
4. The light source module according to claim 3, wherein: The first range is 200-500 nm.
5. The light source module according to claim 3, wherein: It further comprises a color light conversion layer, which is arranged on the other side of the diffusion layer relative to the substrate. The color light conversion layer comprises a plurality of quantum dots. After receiving the visible light, the quantum dots are excited to emit red light and green light.
6. The light source module according to claim 5, characterized in that: There is a gap between the diffusion layer and the substrate.
7. The light source module according to claim 5, characterized in that: The diffusion layer is disposed on the first surface and covers the first light source and the first sensor.
8. The light source module according to claim 3, wherein: It further comprises a color light conversion layer, which is arranged on the side of the diffusion layer facing the substrate. The color light conversion layer comprises a plurality of quantum dots. After receiving the visible light, the quantum dots are excited to emit red light and green light.
9. The light source module according to claim 2, wherein: The visible light is white light.
10. The light source module according to claim 9, wherein: The first range is 350-500 nm.
11. The light source module according to claim 1, wherein: The invention further comprises a second light source, which is arranged in or outside the first area of the first surface and emits the invisible light.
12. A display device, characterized in that: Include: The light source module according to any one of claims 1 to 11; and A panel module is arranged on the other side of the diffusion layer relative to the substrate.