LED lighting device

Abstract

The present application is applicable to the technical field of light-emitting devices, and provides an LED light-emitting device, including a substrate having a light source surface, a first light source group and a second light source group connected to the light source surface, and a decoding module connected to the substrate; the first light source group can output blue light with a high color temperature, and the second light source group can output white light with a medium color temperature; the decoding module is used to decode the video or image signal or the picture signal into a row and column scanning signal and control the brightness of the first light source group and the second light source group respectively according to the row and column scanning signal. By controlling the brightness timing change of the blue light of the first light source group and the white light of the second light source group, the dynamic color effect of the blue sky and white clouds in the clear sky is simulated; the light of the first light source group and the second light source group has the characteristics of rich and continuous spectrum after mixing, and no obvious loss in the visible light range, high luminous efficiency, better color rendering, higher saturation, and can better restore the true color of the object illuminated by the light-emitting device.

Description

Technical Field

[0001] The present application relates to the technical field of light emitting devices, and in particular to an LED light emitting device. Background Art

[0002] With the continuous maturity and development of lighting technology, LED (Light Emitting Diode) light sources have been widely used in lighting, display and other fields. It not only has the advantages of small size, low heat generation, energy saving, but also can work normally in various working environments, and has a wide range of applications. The light-emitting principle of LED is that under the forward voltage of the diode, the minority carriers and the majority carriers recombine to emit light, which is destined to make the LED light source have the characteristics of strong monochromaticity.

[0003] In traditional solutions, in order to achieve dynamic daylight lighting or simulate the dynamic color effects in a clear sky, the solution of installing a display on the ceiling is often adopted. Because the RGB LEDs (red light chip LED, blue light chip LED, white light chip LED) used in the display are all packaged from monochrome LED chips, their own luminous efficiency is low, and the luminous spectra of the three LEDs are all narrow-band spectra, which cannot form a continuous spectrum. Although it can dynamically fit the lighting effect of the sky, there are technical problems such as poor spectral continuity, poor color rendering, and low luminous efficiency, and it is impossible to achieve high-quality lighting effects. Summary of the invention

[0004] The purpose of the present application is to provide an LED lighting device, aiming to solve the technical problem of poor spectral continuity of traditional lighting devices used to simulate dynamic sky lighting effects.

[0005] The present application is implemented as follows: an LED light-emitting device includes a substrate having a light source surface, a first light source group connected to the light source surface, a second light source group connected to the light source surface, and a decoding module connected to the substrate; the first light source group can output blue light with a color temperature greater than or equal to 20000K, and the second light source group can output white light with a color temperature of 3800K-7800K; the decoding module is used to decode a video or image signal into a row and column scanning signal and control the brightness of the first light source group and the second light source group respectively according to the row and column scanning signals.

[0006] In one embodiment of the present application, the LED light-emitting device further includes a third light source group connected to the light source surface, and the third light source group can output yellow light with a color temperature of 1900K-3800K.

[0007] In one embodiment of the present application, the first light source group includes N first light sources, the second light source group includes N second light sources, and the third light source group includes N third light sources; one first light source, one second light source and one third light source constitute a pixel display unit.

[0008] In one embodiment of the present application, the first light source group includes N first light sources, the second light source group includes 2N second light sources, and the third light source group includes N third light sources; one first light source, two second light sources and one third light source constitute a pixel display unit.

[0009] In one embodiment of the present application, the LED light-emitting device further includes a fourth light source group connected to the light source surface, and the fourth light source group can output green light.

[0010] In one embodiment of the present application, the first light source group includes N first light sources, the second light source group includes N second light sources, the third light source group includes N third light sources, and the fourth light source group includes N fourth light sources; one first light source, one second light source, one third light source and one fourth light source constitute a pixel display unit.

[0011] In one embodiment of the present application, the LED lighting device further includes a dimming element disposed opposite to the light source surface, and a haze of the dimming element is greater than or equal to 50%.

[0012] In one embodiment of the present application, the light transmittance of the dimming element ranges from 48% to 96%.

[0013] In one embodiment of the present application, the first light source group uses a continuous spectrum blue light LED, and the second light source group uses a continuous spectrum white light LED.

[0014] In one embodiment of the present application, the light source surface is coated with a light absorbing layer.

[0015] Implementing an LED lighting device provided by any embodiment of the present application has at least the following beneficial effects:

[0016] The LED light-emitting device provided in each embodiment of the present application decodes the video or image signal into a row and column scanning signal through a decoding module, and controls the brightness timing change of the first light source group and the second light source group arranged on the light source surface of the substrate accordingly, so as to simulate the dynamic color effect of the blue sky and white clouds in the clear sky; the first light source group is used for high color temperature blue light illumination, and the second light source group is used for medium color temperature white light illumination. After the light of the first light source group and the second light source group is mixed, it has the characteristics of rich and continuous spectrum and no obvious omission in the visible light range, high luminous efficiency, better color rendering and higher light saturation, so that the LED light-emitting device can better restore the true color of the object illuminated by the light-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic structural diagram of an LED light-emitting device provided in the first embodiment of the present application;

[0019] Figure 2 is a schematic structural diagram of an LED light-emitting device provided in a second embodiment of the present application;

[0020] Figure 3 is a schematic structural diagram of an LED light-emitting device provided in a third embodiment of the present application;

[0021] Figure 4 is a schematic structural diagram of an LED light-emitting device provided in a fourth embodiment of the present application;

[0022] Figure 5 It is a structural schematic diagram of the LED light-emitting device provided in the second embodiment of the present application from another perspective.

[0023] The reference numerals in the above drawings are as follows:

[0024] 1-substrate; 11-light source surface; 21-first light source group; 22-second light source group; 23-third light source group; 24-fourth light source group; 3-decoding module; 4-dimming element. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0027] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0028] See also Figures 1 to 3 An embodiment of the present application provides an LED light-emitting device, comprising a substrate 1 having a light source surface 11, a first light source group 21 connected to the light source surface 11, a second light source group 22 connected to the light source surface 11, and a decoding module 3 connected to the substrate 1; the first light source group 21 can output blue light with a color temperature greater than or equal to 20000K, and the second light source group 22 can output white light with a color temperature of 3800K-7800K; the decoding module 3 is used to decode a video or image signal into a row and column scanning signal and control the brightness of the first light source group 21 and the second light source group 22 respectively according to the row and column scanning signals.

[0029] In this embodiment, the first light source group 21 includes a plurality of first light sources, the second light source group 22 includes a plurality of second light sources, and one first light source and one second light source group 22 form a pixel display unit. The first light source group 21 can emit blue light with a high color temperature to simulate the color effect of the blue sky in a clear sky; the second light source group 22 can emit white light with a medium color temperature to simulate the color effect of white clouds in a clear sky. The decoding module 3 decodes the video or image signal input to the LED light-emitting device into a row and column scanning signal according to a preset logic, and controls the brightness of the first light source group 21 and the second light source group 22 to change according to a time rule according to the row and column scanning signal, thereby simulating the dynamic color effect of the blue sky and white clouds in a clear sky on the LED light-emitting device. Moreover, the high color temperature blue light emitted by the first light source group 21 and the medium color temperature white light emitted by the second light source group 22 can simulate the lighting effect of daylight.

[0030] The LED lighting device provided in this embodiment can achieve at least the following beneficial technical effects:

[0031] The LED light-emitting device provided in this embodiment decodes the video or image signal into row and column scanning signals through the decoding module 3, and controls the brightness timing change of the first light source and the second light source arranged on the light source surface 11 of the substrate 1 accordingly, so as to simulate the dynamic color effect of blue sky and white clouds in a clear sky; the first light source group 21 is used for blue light illumination with high color temperature, and the second light source group 22 is used for white light illumination with medium color temperature. After the light of the first light source group 21 and the second light source group 22 is mixed, it has the characteristics of rich and continuous spectrum and no obvious omission in the visible light range, high luminous efficiency, better color rendering and higher light saturation, so that the LED light-emitting device can better restore the true color of the object illuminated by the light-emitting device.

[0032] In one embodiment of the present application, the first light source group 21 includes 2N first light sources, and the second light source group 22 includes N second light sources; two first light sources and one second light source constitute a pixel display unit. The advantage of this is that the intensity of the blue light in the light emitted by the LED light-emitting device can be ensured to be high enough to better simulate the dynamic effect of the blue sky and white clouds in a clear sky.

[0033] See also Figures 1 to 3 In one embodiment of the present application, the LED light-emitting device further includes a third light source group 23 connected to the light source surface 11, and the third light source group 23 can output yellow light with a color temperature of 1900K-3800K.

[0034] More specifically, in the present embodiment, the first light source group 21 includes a plurality of first light sources, the second light source group 22 includes a plurality of second light sources, and the third light source group 23 includes a plurality of third light sources; the decoding module 3 decodes the video or image signal into row and column scanning signals, and controls the timing changes of the brightness of the first light source, the second light source and the third light source arranged on the light source surface 11 of the substrate 1 accordingly, thereby being able to simulate the dynamic color effect of the blue sky and white clouds in a clear sky, and also being able to simulate the dynamic color effect of the sky at dusk.

[0035] The first light source group 21 is used for blue light illumination with high color temperature, the second light source group 22 is used for white light illumination with medium color temperature, and the third light source group 23 is used for yellow light illumination with low color temperature. The first light source group 21, the second light source group 22 and the third light source group 23 all have continuous spectrum characteristics, high light energy utilization rate, better continuity of luminous spectrum, better color rendering and higher light saturation, so that the LED light-emitting device can better restore the true color of the object illuminated by the light-emitting device.

[0036] See also Figure 1 and Figure 2In one embodiment of the present application, the first light source group 21 includes N first light sources, the second light source group 22 includes N second light sources, and the third light source group 23 includes N third light sources; one first light source, one second light source and one third light source constitute a pixel display unit.

[0037] For example, see Figure 2 As an optional solution of this embodiment, the first light source, the second light source and the third light source are arranged on the light source surface 11 to form a plurality of mutually parallel light source strips, and the first light source, the second light source and the third light source on the same light source strip are arranged alternately and equidistantly; it is also feasible, please refer to Figure 1 The connecting lines between the first light source, the second light source and the third light source form an equilateral triangle, and the pixel display units are arranged vertically and horizontally and laid on the light source surface 11.

[0038] See also Figure 3 In one embodiment of the present application, the first light source group 21 includes N first light sources, the second light source group 22 includes 2N second light sources, and the third light source group 23 includes N third light sources; one first light source, two second light sources and one third light source constitute a pixel display unit.

[0039] For example, as an optional scheme of the present embodiment, the first light source and the second light source are arranged alternately and equidistantly on the light source surface 11 to form a plurality of mutually parallel first light source bands, the second light source and the third light source are arranged alternately and equidistantly on the light source surface 11 to form a plurality of mutually parallel second light source bands, and the first light source band and the second light source band are arranged in parallel, alternately and equidistantly; or, the second light source forms a plurality of mutually parallel first light source bands on the light source surface 11, the first light source and the third light source are arranged alternately and equidistantly on the light source surface 11 to form a plurality of mutually parallel second light source bands, the first light source band and the second light source band are arranged in parallel, alternately and equidistantly, and the number of light sources in the first light source band is equal to the number of light sources in the second light source band; it is also feasible that the connecting lines between a first light source, two second light sources and one third light source form a square, and the pixel display units are arranged vertically and horizontally and laid on the light source surface 11.

[0040] In this embodiment, by setting the ratio of the number of the first light source, the second light source and the third light source to 1:2:1, the number of light sources included in each pixel display unit can be four, which is more conducive to the arrangement and plane paving of the pixel display unit, and makes the arrangement of the control circuit on the substrate 1 more convenient; at the same time, the additional second light source can play the role of fill light, without affecting the continuous spectrum and color authenticity of the lighting, so that the brightness of the LED light-emitting device is higher, with a better lighting effect, and can better restore the visual effect of the color of the object under clear sunlight.

[0041] See also Figure 4In one embodiment of the present application, the LED light emitting device further includes a fourth light source group 24 connected to the light source surface 11, and the fourth light source group 24 can output green light.

[0042] More specifically, in the present embodiment, the first light source group 21 includes a plurality of first light sources, the second light source group 22 includes a plurality of second light sources, the third light source group 23 includes a plurality of third light sources, and the fourth light source group 24 includes a plurality of fourth light sources; the decoding module 3 decodes the video or image signal into row and column scanning signals, and controls the timing changes of the brightness of the first light source, the second light source, the third light source and the fourth light source arranged on the light source surface 11 of the substrate 1 accordingly, thereby being able to simulate the dynamic color effects of the blue sky, white clouds and green leaves in a clear sky, and also being able to simulate the dynamic color effects of the sky at dusk.

[0043] The first light source group 21 is used for blue light illumination with high color temperature, the second light source group 22 is used for white light illumination with medium color temperature, the third light source group 23 is used for yellow light illumination with low color temperature, and the fourth light source group 24 is used for green light illumination. The first light source group 21, the second light source group 22 and the fourth light source group 24 all have continuous spectrum characteristics, high light energy utilization rate, better continuity of luminous spectrum, better color rendering and higher light saturation, so that the LED light-emitting device can better restore the true color of the object illuminated by the light-emitting device.

[0044] See also Figure 4 In one embodiment of the present application, the first light source group 21 includes N first light sources, the second light source group 22 includes N second light sources, the third light source group 23 includes N third light sources, and the fourth light source group 24 includes N fourth light sources; one first light source, one second light source, one third light source and one fourth light source group 24 constitute a pixel display unit.

[0045] For example, see Figure 4 As an optional scheme of the present embodiment, the first light source and the second light source are arranged alternately and equidistantly on the light source surface 11 to form a plurality of mutually parallel first light source bands, the third light source and the fourth light source are arranged alternately and equidistantly on the light source surface 11 to form a plurality of mutually parallel second light source bands, and the first light source bands and the second light source bands are arranged in parallel, alternately and equidistantly; it is also feasible that the connecting lines between the first light source, the second light source, the third light source and the fourth light source form a square, and the pixel display units are arranged vertically and horizontally and laid on the light source surface 11.

[0046] In one embodiment of the present application, the first light source group 21 includes N first light sources, the second light source group 22 includes N second light sources, and the fourth light source group 24 includes N fourth light sources; one first light source, one second light source and one fourth light source group 24 constitute a pixel display unit.

[0047] In one embodiment of the present application, the first light source group 21 includes N first light sources, the second light source group 22 includes 2N second light sources, and the fourth light source group 24 includes N fourth light sources; one first light source, two second light sources and one fourth light source group 24 constitute a pixel display unit.

[0048] The above two embodiments can also simulate the dynamic color effects of blue sky, white clouds and green leaves in a clear sky. Among them, the number ratio and arrangement of the first light source, the second light source and the fourth light source can refer to the number ratio and arrangement of the first light source, the second light source and the third light source in the previous embodiment, and the technical effects are similar or the same as those in the previous embodiment, which will not be repeated here.

[0049] See also Figure 5 In one embodiment of the present application, the LED light-emitting device further includes a dimming element 4 arranged opposite to the light source surface 11, and the haze of the dimming element 4 is greater than or equal to 50%. More specifically, the dimming element 4 can be a dimming film or a dimming plate with a preset haze and a preset transmittance; the haze range of the dimming element 4 is 95%-98%. In this embodiment, if the haze of the dimming element 4 is too high, the image of the blue sky and white clouds displayed by the LED light-emitting device will be too low in clarity, or even completely blurred, so that the LED light-emitting device can only play a lighting effect and lose its decorative effect; if the haze of the dimming element 4 is too low, the first light source, the second light source, the third light source and the fourth light source in the LED light-emitting device will be easily observed directly by the human eye, affecting the display effect of the LED light-emitting device.

[0050] In one embodiment of the present application, the haze of the dimming element 4 is 95% or 98%.

[0051] In one embodiment of the present application, the transmittance of the dimming element 4 ranges from 48% to 96%. In this embodiment, if the transmittance of the dimming element 4 is too low, the image of the blue sky and white clouds displayed by the LED light-emitting device will be too low in clarity, or even completely blurred, so that the LED light-emitting device can only play a lighting effect and lose its decorative effect; if the transmittance of the dimming element 4 is too high, the first light source, the second light source, the third light source, and the fourth light source in the LED light-emitting device will be easily directly observed by the human eye, affecting the display effect of the LED light-emitting device. As a specific solution of this embodiment, the transmittance of the dimming element 4 is 67%.

[0052] In one embodiment of the present application, the dimming element 4 is arranged parallel to the light source surface 11, and the distance between the dimming element 4 and the light source surface 11 ranges from 4mm to 70mm. In this embodiment, if the distance between the dimming element 4 and the light source surface 11 is too large, the thickness of the LED light-emitting device will be too large, which is not conducive to the installation and use of the LED light-emitting device; if the distance between the dimming element 4 and the light source surface 11 is too small, the first light source, the second light source, the third light source and the fourth light source in the LED light-emitting device will be easily directly observed by the human eye, affecting the display effect of the LED light-emitting device. As a specific solution of this embodiment, the distance between the dimming element 4 and the light source surface 11 is 30mm.

[0053] It should be understood that the haze and transmittance of the dimming element 4 should depend on the sizes of the LED lamp beads used by the first light source, the second light source, the third light source and the fourth light source; when the first light source, the second light source, the third light source and the fourth light source use smaller LED lamp beads, the haze of the dimming element 4 can be appropriately reduced, and the transmittance of the dimming element 4 can be increased, so as to maximize the clarity of the image of blue sky and white clouds presented by the LED light-emitting device and improve the utilization rate of light energy under the premise that the LED lamp beads cannot be directly observed by the human eye.

[0054] In one embodiment of the present application, the pixel display units are arranged on the light source surface 11 at intervals less than or equal to 25 mm, and the distance between the center points of the pixel display units is less than or equal to 40 mm.

[0055] In one embodiment of the present application, the first light source group 21 uses a continuous spectrum blue light LED, and the second light source group 22 uses a continuous spectrum white light LED. More specifically, the third light source group 23 uses a continuous spectrum yellow light LED, and the fourth light source group 24 uses a continuous spectrum green light LED. By using a continuous spectrum blue light LED, a continuous spectrum white light LED, a continuous spectrum yellow light LED, and a continuous spectrum green light LED, the spectral continuity of the light emitted by the LED light-emitting device can be further improved, so that the LED light-emitting device has better color rendering and higher light saturation, and can better restore the color of the object.

[0056] As a specific solution of this embodiment, the first light source uses a high color temperature blue light LED with an X color coordinate range of 0.18-0.25 and a Y color coordinate range of 0.18-0.25, the second light source uses a medium color temperature white light LED with an X color coordinate range of 0.30-0.34 and a Y color coordinate range of 0.31-0.36, and the third light source uses a low color temperature yellow light LED with an X color coordinate range of 0.41-0.49 and a Y color coordinate range of 0.38-0.45. The advantage of this is that it can better restore the blue sky at noon, the white clouds under a clear sky, and the yellow sky at dusk, and thus can highly restore the dynamic color effects of the blue sky and white clouds in the clear sky, as well as the dynamic color effects of the sky at dusk.

[0057] As a specific solution of this embodiment, the power of a single continuous spectrum blue LED, a continuous spectrum white LED, a continuous spectrum yellow LED, and a continuous spectrum green LED is less than or equal to 0.2 watts. More specifically, the power of a single continuous spectrum blue LED, a continuous spectrum white LED, a continuous spectrum yellow LED, and a continuous spectrum green LED is 0.06 watts. By appropriately reducing the luminous power of a single LED lamp bead, the spectrum of mixed light emitted by the LED light-emitting device can be rich and continuous, and there is no obvious deficiency in the visible light range, with better color rendering and higher light saturation, so that the LED light-emitting device can better restore the true color of the object illuminated by the light-emitting device; at the same time, it is avoided that the LED light-emitting device heats up too fast due to high-power light emission, and the LED light-emitting device can work stably for a long time.

[0058] In one embodiment of the present application, a light absorbing layer is coated on the light source surface 11. In this embodiment, the light absorbing layer is coated and attached to the surface of the substrate 1, and the light absorbing layer avoids the first light source group 21, the second light source group 22, the third light source group 23 and the fourth light source group 24 on the light source surface 11.

[0059] Part of the light emitted by the LED light-emitting device will be reflected in the direction opposite to the light source surface 11 after irradiating the substrate 1 and observed by the human eye. By coating the light-absorbing layer on the light source surface 11, the color of the substrate 1 itself can be prevented from affecting the light-emitting effect of the LED light-emitting device.

[0060] As a specific solution of this embodiment, the light source surface 11 is coated with a black light-absorbing layer. After the LED light-emitting device is used for a long time, the light-absorbing layer coating will often change color due to heat, oxidation, absorption of electromagnetic waves of a specific wavelength, etc., which will affect the light-emitting effect of the LED light-emitting device; by coating the black light-absorbing layer on the light source surface 11, the color change of the light-absorbing layer after the LED light-emitting device is used for a long time can be greatly reduced, and the influence of the color change of the light-absorbing layer itself on the light-emitting effect of the LED light-emitting device can be reduced.

[0061] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An LED light-emitting device, characterized in that: It comprises a substrate having a light source surface, a first light source group connected to the light source surface, a second light source group connected to the light source surface, and a decoding module connected to the substrate; the first light source group can output blue light with a color temperature greater than or equal to 20000K, and the second light source group can output white light with a color temperature of 3800K-7800K; the decoding module is used to decode a video or image signal into a row and column scanning signal and control the brightness of the first light source group and the second light source group respectively according to the row and column scanning signal; The LED light emitting device further comprises a third light source group connected to the light source surface, and the third light source group can output yellow light with a color temperature of 1900K-3800K; The LED light emitting device further comprises a fourth light source group connected to the light source surface, and the fourth light source group can output green light; The first light source group uses a continuous spectrum blue light LED, the second light source group uses a continuous spectrum white light LED, the third light source group uses a continuous spectrum yellow light LED, and the fourth light source group uses a continuous spectrum green light LED; The first light source uses a high color temperature blue LED with an X color coordinate range of 0.18-0.25 and a Y color coordinate range of 0.18-0.25, the second light source uses a medium color temperature white LED with an X color coordinate range of 0.30-0.34 and a Y color coordinate range of 0.31-0.36, and the third light source uses a low color temperature yellow LED with an X color coordinate range of 0.41-0.49 and a Y color coordinate range of 0.38-0.45; The power of a single continuous spectrum blue LED, continuous spectrum white LED, continuous spectrum yellow LED and continuous spectrum green LED is less than or equal to 0.2 watt.

2. The LED lighting device according to claim 1, characterized in that: The first light source group includes N first light sources, the second light source group includes N second light sources, the third light source group includes N third light sources, and the fourth light source group includes N fourth light sources; one first light source, one second light source, one third light source and one fourth light source constitute a pixel display unit.

3. The LED lighting device according to claim 1 or 2, characterized in that: The LED lighting device further comprises a dimming element arranged opposite to the light source surface, and the haze of the dimming element is greater than or equal to 50%.

4. The LED lighting device according to claim 3, characterized in that: The light transmittance of the dimming element ranges from 48% to 96%.

5. The LED lighting device according to claim 1 or 2, characterized in that: The light source surface is coated with a light absorbing layer.

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