RU214203U1 - Illuminated display device - Google Patents

Abstract

The utility model relates to the field of illuminated display devices. The display device is located in the housing and contains radiation sources located on the substrate and indicators located in one of the walls of the housing on top of the radiation sources. Each radiation source corresponds to a certain indicator, between one of the radiation sources and the corresponding indicator there is one layer of a two-dimensional Fresnel lens, and between the other of the radiation sources and the corresponding indicator there is a stack of two layers of two-dimensional Fresnel lenses superimposed one above the other at an angle of 90 degrees. At the same time, a layer of a two-dimensional Fresnel lens and a stack of two layers of two-dimensional Fresnel lenses are located in such a way that they provide the given radiation distribution diagrams on the corresponding indicators. The device provides a given radiation distribution diagram on the indicator with uniform illumination of the indicators. 14 w.p. f-ly, 9 ill.

Description

Technical field

The utility model relates to the field of illuminated display devices used in smart speakers and other similar devices for uniformly illuminated translucent surfaces in the form of screens, indicators or buttons in a limited space.

Description of the prior art

A variety of illuminated display devices are known in the art for generating uniformly illuminated indicators in the form of symbols or signs, translucent screen surfaces, indicators, and the like.

In the patent RU 2364904 C1, IPC G02F 1/1335, publ. 20.08.2009 disclosed is a backlight device used to uniformly illuminate a liquid crystal panel with light emitting diode (LED) light and can be applied to liquid crystal (LCD) televisions, industrial displays, and other backlit devices. The backlight device contains a plurality of light emitting diodes (LEDs) located separately from each other, a light guide plate made of a transparent optical material, which has a first surface and a second surface provided with a plurality of recesses, as well as a reflective plate located under the light guide plate. The lateral surfaces of the recesses are shaped to allow total internal reflection of part of the light emitted by the light emitting surfaces of the LEDs in the angular aperture α=±arcsin(l/n) from the normal to the light emitting surfaces of the LEDs, where n is the refractive index of the transparent optical material, while at least one of the surfaces of the light guide plate contains a light extractor. The disadvantage of this device is a large number of optical elements, causing a certain difficulty in their alignment to obtain the required illumination of the surface of the image panel.

In the patent RU 2563212 C1, IPC F21V 9/14, publ. 20.09.2015. a thin liquid crystal polarizer is disclosed, which can be used in anti-dazzle systems based in their work on polarized radiation to improve vehicle traffic safety, as well as in information display devices. The thin polarizer contains a system of spatial separators of polarization radiation components in the form of two successively installed films of a birefringent substance on liquid crystal molecules (1), an optically transparent dielectric substance (7), a spatially matching rotator of polarization radiation components (3), a block for generating control potentials. This patent discloses the possibility of obtaining polarized light for traffic safety purposes, but does not disclose methods for obtaining uniform illumination while maintaining a given radiation intensity.

The technical solution is known from the prior art, which relates to the closest patent analogue of the claimed utility model, and which is disclosed in the utility model CN 203608486 U, IPC H05K 5/02, publ. 05/21/2014, see Fig. 4a, which discloses “Panel Mechanism and Electronic Device”. The utility model discloses a panel mechanism and an electronic device. The panel mechanism includes a panel 1, a light focusing element 4 for focusing light, made of a birefringent material and a light indicator 2. The panel 1 is equipped with a port 11 with an end surface 11, and the port status indicator 2 is located opposite the port 11. The light focusing element 4 is located on the light indicator 2. The light emitted by indicator light 2 with emitter 21 is focused by light focusing element 4 and transmitted to port 11. The electronic device is equipped with a panel mechanism. In the panel mechanism and the electronic device provided by the utility model, the light focusing member 4 is located on the indicator light 2, and the light emitted by the light indicator 2 is focused by the light focusing member 4 and transmitted to the port 11. Even if the distance between the indicator light 2 and the panel 1 large, the intensity of the light reaching the port can be high and meet the port status indication requirements. In the known solution, the birefringent material collects and focuses the light emitted by the radiation source 21 . But the disadvantage of this solution is the uneven distribution of light in the region of the port 11 of the panel 1, which significantly degrades the quality of the backlight.

However, many applications of radiation sources used in this area have limitations in terms of space and illumination. Therefore, very often small light sources such as LEDs are used for space saving purposes, these devices require additional optical means to create the required lighting parameters. For example, in some applications it is desirable to provide a light source with well collimated light, or illumination that is substantially uniform over an area, i.e. it is required to provide illumination of the display device, providing a uniformly illuminated surface, but at the same time, not taking up much space.

At present, multimedia platforms such as smart speakers are widely used in technology. Such devices belong to the class of intellectual technology and are speakers with a built-in central processor, microphone, video camera and other electronic elements, which are devices that perform separate functions. Such smart speakers can be connected to the Internet or the cloud to process user requests, download content, etc.

One such device is smart speakers manufactured by the patent holder of this application, Yandex LLC, which have become very popular among users, and therefore, improved new versions of this device are constantly being developed to expand the functionality that users can use. Smart speakers "Yandex.Station Mini" or "Yandex.Station Mini 2" from Yandex LLC have a limited space for placing additional optical elements in the form of light guides, diffusers and similar optical elements in the case of a smart device to ensure uniform illumination of indicators while maintaining intensity their radiation.

Thus, one of the important tasks of the known illuminated display devices for a smart speaker is to provide uniform illumination, while maintaining its intensity, which is one of the problems due to the small size of the illumination surfaces of display panels and devices.

The authors of the utility model conducted a number of experimental studies and obtained an illuminated display device for a smart speaker, which provides a uniform illumination of the indicator, while maintaining its intensity, in a limited space of the smart speaker case.

At the same time, the illuminated display device of the claimed utility model is configured to function as an on/off button of a smart speaker, or a means of volume control, or other functions of smart speaker indicators.

The essence of the utility model

According to the utility model, an illuminated display device is proposed, located in the housing and containing radiation sources located on the substrate and indicators located in one of the walls of the housing, over the radiation sources, with each radiation source corresponding to a specific indicator, and between one of the radiation sources and the corresponding indicator one layer of a two-dimensional Fresnel lens is located, and between the other of the radiation sources and the corresponding indicator there is a stack of two layers of two-dimensional Fresnel lenses superimposed one above the other at an angle of 90 degrees, while a layer of a two-dimensional Fresnel lens and a stack of two layers of two-dimensional Fresnel lenses are located in such a way in a way that provides the given radiation distribution diagrams on the corresponding indicators.

In the illuminated display device, the emitting device is a light-emitting diode (LED).

In the illuminated display device, the radiation sources are directional radiation sources of the same color or radiation sources of different colors and provide radiation of red, yellow, blue, green colors.

In addition, the indicators in the illuminated display device are made of a translucent material and can be made in the form of an on button, an off button, a “+” label, a “-” label, a volume control.

At the same time, the translucent material from which the indicators are made is glass, transparent plastic, and plexiglass.

It should be noted that a layer of a two-dimensional Fresnel lens is located between one of the radiation sources and the corresponding indicator, in close proximity to the specified indicator, with the possibility of providing a given radiation distribution diagram on the corresponding indicator.

In addition, in the illuminated display device, a stack of two layers of two-dimensional Fresnel lenses is located between one of the radiation sources and the corresponding indicator, in close proximity to the indicated indicator, with the possibility of providing a given radiation distribution diagram on the corresponding indicator.

In an illuminated display device, a layer of a two-dimensional Fresnel lens is located between one of the illumination sources and the corresponding indicator, at a predetermined distance from the predetermined indicator, with the possibility of providing a predetermined radiation distribution diagram on the corresponding indicator.

In addition, in the illuminated display device, a stack of two layers of two-dimensional Fresnel lenses is located between one of the radiation sources and the corresponding indicator, at a given distance from the indicated indicator, with the possibility of providing a given radiation distribution diagram on the corresponding indicator.

In this case, the substrate is a printed circuit board powered from a power source by a signal from the control unit.

And the given radiation distribution diagram, formed by the claimed illuminated display device, is a brighter illumination along the edges of the indicator and decreasing along the gradient towards the center of the indicator.

In addition, the illuminated device according to the utility model is designed to be integrated into the housing of the smart device.

Brief description of the drawings

The above and other features and advantages of the present invention are explained in the following description, illustrated by drawings, in which the following is presented:

fig. 1 illustrates the appearance of a smart speaker according to the claimed utility model;

fig. 2 illustrates the appearance of the smart speaker cover with "+" and "-" indicators representing the volume controls according to the claimed utility model;

Fig.3 illustrates a diagram of an illuminated display device for a smart column according to the claimed utility model;

fig. 4a illustrates the diagram of a display device according to the prior art (utility model CN 203608486 U);

4b illustrates an image generated by an LED backlight device in which the 2D Fresnel lens layer is missing;

5a illustrates an image generated by an illuminated LED-based display device with a single layer of a two-dimensional Fresnel lens according to the claimed utility model.

5b illustrates an image formed by an illuminated LED display device with two layers of a two-dimensional Fresnel lens superimposed on each other according to the claimed utility model.

Fig.6 schematically shows the location of the layer of a two-dimensional Fresnel lens relative to the radiation source in the illuminated display device according to the claimed utility model.

Fig.7 is a schematic top view of the indicators on the cover of a smart speaker according to Example 1 of the claimed utility model.

Detailed description of the utility model

As mentioned earlier in this description, smart speakers "Yandex.Station Mini" or "Yandex.Station Mini 2" from Yandex LLC have limited space for placing additional optical elements in the form of light guides, diffusers and similar optical elements in the case of a smart device for ensuring uniform illumination of indicators while maintaining the intensity of their radiation. An example of a smart speaker is shown in Fig.1.

Thus, the task of the claimed utility model, which relates to an illuminated display device, is to provide uniform illumination of indicators, while maintaining its intensity, in a limited space of devices, such as smart speakers, into which the claimed illuminated display device can be built.

The authors of the utility model conducted a number of experimental studies and revealed an unexpected effect of a film based on a two-dimensional Fresnel lens under the conditions of its inclusion in the design of the claimed illuminated display device, which provides uniform illumination of indicators with a given light distribution pattern, while maintaining its intensity, in the limited space of the smart device case. columns.

At the same time, the illuminated display device of the claimed utility model is configured to function as an on/off button of a smart speaker, or a volume control or other functions of indicators of a smart speaker or similar devices.

Thus, in order to overcome the shortcomings of the prior art, applicants use layers consisting of two-dimensional Fresnel lenses. Fresnel lenses, according to classical optics, consist of concentric rings, each of which is a section of a conical two-dimensional Fresnel lens, after refraction it comes out as an almost parallel surface beam with a curvilinear profile and is an element of the surface of a solid lens. Due to this design, the Fresnel lens has a small thickness and weight even with a large angular aperture. The sections of the rings near the lens are built in such a way that its spherical aberration is reduced, and the rays of a point source, in this case an LED, placed in focus on the translucent surface of the indicator, which provides the effect of uniform distribution of radiation in the indicator area.

An example of a Fresnel lens is disclosed in International Publication WO2007033089(A1), March 22, 2007. and is presented in the present description as a non-limiting example.

The inventors proposed an illuminated display device (see figure 3), located in the smart speaker housing, although in this case, the specified illuminated device can be installed in any other device that requires indicators or buttons, and containing a substrate 1 on which at least one radiation source 2 is installed, made in the form of a light-emitting diode (LED), at least one indicator 3, made in the wall of the housing, for example, a smart speaker or other similar device, this indicator is an indicator 3 with a translucent surface 3a, at least at least one layer 4 of a two-dimensional Fresnel lens located between the radiation source 2 and the indicator 3. The indicator(s) 3 can be made of any light-conducting material: glass, transparent plastic, plexiglass, etc., and the LED is a directional radiation source of one or several colors, such as one of: red, yellow, blue or green. In this case, if one LED is green and the other is red, or both LEDs are the same color.

When initiating the operation of at least one radiation source 2, the light beam emitted by at least one radiation source 2 falls on the layer 4 of a two-dimensional Fresnel lens, where it is refracted at a given angle and, passing through the layer/layers 4 (layers), is focused on indicators 3 for their illumination with a predetermined radiation profile. Indicators in the form of a button, labels, made of a translucent material, can be located directly adjacent to the layer of a two-dimensional Fresnel lens or at a distance from it in order to reduce attenuation. Indicators 3 can be made of any light-conducting material: glass, transparent plastic, plexiglass, etc.

In FIG. 2 shows the appearance of the wall, which in this case is the cover of a smart speaker, on which there are two volume indicators with the marks "-" and "+", and further the operation of the illuminated display device will be described using the example of an embodiment of the claimed device shown in Fig. 3 .

At the same time, figure 5a shows the image of the indicator "-" corresponding to the overlay of one layer of a two-dimensional Fresnel lens on top of the radiation device 2 in the form of a light-emitting diode (LED), figure 4b shows an image of the indicator with the label "+" corresponding to the overlay of two layers of a two-dimensional Fresnel lens ( stack) on top of the lighting device 2 in the form of a light-emitting diode (LED). As can be seen in the images of the indicators in Figs. 5a and 5b, a brighter illumination is provided on the surface of the indicator along the edges of the indicator, decreasing towards the center of the indicator, i.e. high brightness is provided along the edge of the indicator and decreases along the gradient towards the center of the indicator. At the same time, such a pattern of the scattered beam obtained on the indicator surface is due to the given location of the layer 4 of the two-dimensional Fresnel lens relative to the radiation source 2 and indicator 3. It should be noted that the mutual orientation of the layers 4 of the two-dimensional Fresnel lens between themselves and relative to the radiation source 2 and indicator 3 determines the picture or diagram of the scattered radiation that we get (see fig.5b), i.e. brighter illumination along the edges of the indicator and decreasing along the gradient towards the center of the indicator.

In the case of embedding an illuminated device into a smart speaker, for example, "Station Mini 2", it is necessary to highlight the symbols "+" and "-" - the volume controls on the device. When this layer of a two-dimensional Fresnel lens should be located flat surface to the source 2 of the radiation, see Fig.6.

Regardless of the number of layers of two-dimensional Fresnel lenses used, these layers should be located with their flat part to the radiation source 2, and the grooves or ribs (see Fig.6) of the Fresnel lens should face the translucent surface 3a of the indicators 3.

To illuminate indicator 3 in the form of a "-" symbol, the authors used one layer 4 of a two-dimensional Fresnel lens, while for edge beams falling on the edges of indicator 3, the fresnel lens provides a collimated radiation beam, and light beams falling into the central part of indicator 3 will be have a scattered radiation pattern, which is clearly illustrated in Fig. 5a, and as a result provides the indicator with an image of one strip brighter at the edges and decreasing in brightness in the center of the indicator or in the center of the strip.

For the "+" indicator, we used a stack ("sandwich") of two layers of 4 two-dimensional Fresnel lenses superimposed on each other closely at an angle of 90 degrees. Next, the layers 4 are oriented so that the grooves of one layer of the 2D Fresnel lens are oriented at an angle of 45 degrees to the LED source 2. Thus, by superimposing layers 4 on top of each other, we will obtain symmetrical four maxima, and when one layer 4 of the two-dimensional Fresnel lens is rotated relative to the other layer 4, symmetrical figures can be obtained. Thus, when these layers 4 are superimposed at an angle of 90 degrees relative to each other, the result is a picture with the image of the “+” mark of the indicator 3, while for the edge beams falling on the edges of the indicator Fresnel lens, a collimated beam of radiation is provided, and the beams of light, falling into the central part of the indicator 3 will have a diffuse radiation pattern, which is clearly illustrated in Fig. 5b, and as a result, an image of two mutually perpendicular intersecting strips in the form of a symbol (“+”) is provided on the indicator, brighter at the edges and decreasing in brightness in the center of the indicator or in the center of the strips.

The focus and point of convergence of the radiation beam is selected in accordance with the size of the indicators 3 (or other elements for illumination) and the characteristics of the layers 4 of the two-dimensional Fresnel lens.

It should be noted that each element of the illuminated display device, namely, radiation sources, indicators and a layer of a two-dimensional Fresnel lens, a stack of two layers of two-dimensional Fresnel lenses, is inextricably linked with each other and each of these elements is aimed at achieving the technical result of the claimed utility model, namely, providing a given radiation distribution diagram on the indicator while simultaneously providing a uniform illumination of the indicators, and maintaining its intensity, in a limited space of devices, such as smart speakers, into which the claimed illuminated display device can be built.

The authors conducted a series of experimental tests, and as a result came to the design of an illuminated display device with the following parameters, and obtained the following dependence of the relative position of the layer of a two-dimensional Fresnel lens, the radiation source and the indicator, which provide the required illumination of the indicator.

Empirically, for a surface-mounted LED (for example, an SMD LED) of size 0603, in which 0.7 of the total radiation intensity is distributed in a cone at an angle of 110 degrees, we obtain the following approximate linear dependence - 1 cm of the removal of a layer of a two-dimensional Fresnel lens from the LED corresponds to 1 cm between the diffraction maxima of the scattering pattern radiation. In other words, with a change in the distance (distance) of the layer of the two-dimensional Fresnel lens from the light source in the form of an LED, the diffraction maxima of the radiation scattering pattern change, which means a change in brightness from the edge of the indicator mark to the center of the illumination of the indicator mark. In other variations of the present approach, for example, when using a different size surface mount, 0.8 of the radiation intensity is distributed in a 120 degree cone, and so on.

Example 1

In one embodiment of the design of the claimed illuminated display device according to the utility model shown in Fig. 7, indicators of the “+” and “-” types are located equidistant from the central axis of the smart column or the axis of symmetry of the cylinder, the shape of which is the smart column (see Fig. 7), while the distance between the indicators is 48.3 mm, and the indicators themselves are inscribed in squares with a side of about 6.2 mm. The thickness of the side of the indicator mark of the “+” and “-” types is about 1 mm. In this case, one SMD LED of standard size 0603 is used for the "-" label of the indicator, and two SMD LEDs 0603 installed on the board (substrate) are used for the "+" label of the indicator. In this case, the layer of a two-dimensional Fresnel lens is commensurate with a square with a side of 6.2 mm in which the label "-" is inscribed. A layer of a two-dimensional Fresnel lens is located at a distance of 10 mm from the specified LED, and a stack of two layers of a two-dimensional Fresnel lens located at an angle of 90 degrees relative to each other, which has a size commensurate with the size of a square with a side of 6.2 mm, in which the “+” indicator mark is inscribed, is located at a distance of 10 mm from the specified LED. As a result, such an arrangement of the illuminated display device provides a radiation intensity distribution of approximately 0.7 in a radiation cone with an angle of 110 degrees, providing a radiation distribution diagram on the indicator that is brighter at the edges of the indicator and decreases along the gradient towards the center of the indicator.

Example 2

In another embodiment of the design of the claimed illuminated display device, according to the utility model, the indicators are located equidistant from the central axis of the smart column or the axis of symmetry of the cylinder, the shape of which has a smart column similar to Example 1 in Fig. 7, while the distance between the indicators is 50 mm, and the indicators themselves are inscribed in squares with a side of about 7 mm. The thickness of the label side of the indicator of the "+" and "-" types (or indicators of the "start" and "stop" types) is about 2 mm. A layer of a two-dimensional Fresnel lens is located at a distance of 12 mm from the specified LED, and a stack of two layers of a two-dimensional Fresnel lens located at an angle of 90 degrees relative to each other, which has a size commensurate with the size of a square with a side of about 7 mm, in which the label "+ » indicator, located at a distance of 12 mm from the specified LED. As a result, such an arrangement of the illuminated display device provides a radiation intensity distribution of approximately 0.8 in a radiation cone with an angle of 120 degrees, providing a radiation distribution diagram on the indicator that is brighter at the edges of the indicator and decreases along the gradient towards the center of the indicator.

Thus, the design of the claimed illuminated display device according to the utility model, which allows you to increase the brightness of the radiation source 2 of the radiation in the form of LEDs in comparison with known similar devices. At the same time, based on experimental studies carried out by the authors of the utility model, one layer of a two-dimensional Fresnel lens provides an increase in brightness up to 60%, and a stack of two layers of a two-dimensional Fresnel lens located at an angle of 90 ° provides an increase in brightness up to 120% due to the concentration of several beams in selected areas. This increased brightness can be used to save energy by reducing the brightness of the initial emission.

Industrial Applicability

The illuminated display device according to the utility model can be used to uniformly illuminate any translucent surface, on/off buttons, volume control or other indicator functions of various devices, such as smart speakers, electronic mobile devices, mobile phones, smartphones or tablets.

Claims (15)

1. An illuminated display device located in a housing and containing radiation sources located on the substrate and indicators located in one of the walls of the housing, on top of the radiation sources, with each radiation source corresponding to a certain indicator, and between one of the radiation sources and the corresponding indicator there is one a layer of a two-dimensional Fresnel lens, and between the other of the radiation sources and the corresponding indicator there is a stack of two layers of two-dimensional Fresnel lenses superimposed one above the other at an angle of 90 degrees, while a layer of a two-dimensional Fresnel lens and a stack of two layers of two-dimensional Fresnel lenses are located in such a way that which provide the given radiation distribution diagrams on the corresponding indicators. 2. The illuminated display device according to claim 1, wherein the emitting device is a light-emitting diode (LED). 3. An illuminated display device according to claim 2, wherein the emitters are directional emitters of the same color. 4. An illuminated display device according to claim 2, wherein the emitters are directional emitters of various colors. 5. Illuminated display device according to claim 4, in which the radiation sources provide radiation of red, yellow, blue, green colors. 6. Illuminated display device according to claim 1, in which the indicators are made of a translucent material. 7. Illuminated display device according to claim 1, in which the indicators are made in the form of an on button, an off button, a "+" label, a "-" label, a volume control. 8. An illuminated display device according to claim 6, wherein the translucent material is glass, transparent plastic, plexiglass. 9. Illuminated display device according to claim 1, in which a layer of a two-dimensional Fresnel lens is located between one of the radiation sources and the corresponding indicator, in close proximity to the specified indicator, with the possibility of providing a given radiation distribution diagram on the corresponding indicator. 10. Illuminated display device according to claim 1, in which a stack of two layers of two-dimensional Fresnel lenses is located between one of the radiation sources and the corresponding indicator, in close proximity to the specified indicator, with the possibility of providing a given radiation distribution diagram on the corresponding indicator. 11. Illuminated device according to claim 1, in which a layer of a two-dimensional Fresnel lens is located between one of the illumination sources and the corresponding indicator, at a predetermined distance from the predetermined indicator, with the possibility of providing a predetermined radiation distribution pattern on the corresponding indicator. 12. An illuminated display device according to claim 1, in which a stack of two layers of two-dimensional Fresnel lenses is located between one of the radiation sources and the corresponding indicator, at a predetermined distance from the specified indicator, with the possibility of providing a predetermined radiation distribution pattern on the corresponding indicator. 13. Illuminated display device according to claim 1, in which the substrate is a printed circuit board powered from a power source by a signal from the control unit. 14. An illuminated display device according to claim 1, in which the given radiation distribution pattern is a brighter illumination along the edges of the indicator and decreasing along a gradient towards the center of the indicator. 15. An illuminated display device according to claim 1, which is configured to be integrated into the body of a smart device.

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