KR102446992B1 - LED lighting control unit with spectrum sensing function - Google Patents

Abstract

The present invention relates to an LED lighting control device with a spectrum sensing function, which consists of an R light-emitting element group, a G light-emitting element group, and a B light-emitting element group, and includes an LED light that can individually adjust the brightness of each light-emitting element group; a CMOS image sensor for acquiring and outputting a plurality of images by continuously photographing the LED lights; Spectral comparison to obtain a spectrum deviation value for each RGB signal wavelength by collecting and averaging the pixel values in the plurality of images for each RGB signal wavelength, extracting a spectrum for each RGB signal wavelength, and comparing with the previously obtained spectrum set value for each RGB signal wavelength wealth; It has a plurality of light emitting modes, obtains a spectrum set value for each RGB signal wavelength of the light emitting mode selected by a user and provides it to the spectrum comparator, and then according to the spectrum deviation value for each RGB signal wavelength obtained by the spectrum comparator a spectrum control unit that calculates and provides a spectrum control value for each RGB signal wavelength; and an LED control unit for individually adjusting the brightness values of the R light emitting element group, G light emitting element group, and B light emitting element group of the LED lighting according to the spectrum control value for each RGB signal wavelength.

Description

LED lighting control unit with spectrum sensing function

The present invention relates to an LED lighting control device with a spectrum sensing function that can minimize the device implementation cost.

LED lighting is a diode with a PN junction structure manufactured using a semiconductor manufacturing process, and is a device that emits extra energy as light when electrons and holes combine in the PN junction. The wavelength of light output from LED lighting varies depending on the type of material constituting the LED lighting and impurities added during the manufacturing process.

For example, red light with a wavelength of 700 nm is emitted from the LED light by zinc and oxygen atoms, and green light with a wavelength of 550 nm is emitted from the LED light by nitrogen atoms.

Meanwhile, in addition to adjusting the spectrum of LED lighting, a technology for detecting the spectrum of LED lighting and precisely controlling the spectrum of LED lighting has been developed.

However, in the prior art, a spectrum of LED lighting was detected using a spectrometer using a CCD, but the spectrometer at this time had a disadvantage in that it is an expensive and complicated device.

Korean Patent Registration No. 10-1471653 (Registration Date: 2014.12.04)

Accordingly, in order to solve the above problems, the present invention is a spectrum of a new method that grasps the spectrum of LED lighting through a low-cost CMOS image sensor, and uses it to individually adjust the spectrum of LED lighting for each type of light emitting device. An object of the present invention is to provide an LED lighting control device having a sensing function.

The object of the present invention is not limited to the object mentioned above, and other objects not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

As a means for solving the above problems, according to an embodiment of the present invention is composed of R light emitting element group, G light emitting element group, B light emitting element group, LED lighting capable of individually adjusting the brightness of each light emitting element group; a CMOS image sensor for acquiring and outputting a plurality of images by continuously photographing the LED lights; Spectral comparison to obtain a spectrum deviation value for each RGB signal wavelength by collecting and averaging the pixel values in the plurality of images for each RGB signal wavelength, extracting a spectrum for each RGB signal wavelength, and comparing with the previously obtained spectrum set value for each RGB signal wavelength wealth; It has a plurality of light emitting modes, obtains a spectrum set value for each RGB signal wavelength of the light emitting mode selected by a user and provides it to the spectrum comparator, and then according to the spectrum deviation value for each RGB signal wavelength obtained by the spectrum comparator a spectrum control unit that calculates and provides a spectrum control value for each RGB signal wavelength; and an LED control unit for individually adjusting the brightness values of each of the R light-emitting element group, G light-emitting element group, and B light-emitting element group of the LED lighting according to the spectrum control value for each RGB signal wavelength. control device is provided.

The spectrum comparator sums and averages the RGB signal values for each pixel of each image by image unit to obtain an average RGB signal value for each image, and then sums and averages the RGB signal average value for each image in signal units to obtain and output an RGB signal spectrum characterized in that

"의 식에 따른 모든 파장의 스펙트럼을 감지하며, 상기 Tλ는 측정 파장, 상기 λ1과 상기 λ2은 R 신호, G 신호, B 신호 중에서 측정 파장의 양측에 위치하는 두 개의 신호, 상기 λ1spec와 상기 λ2spec는 상기 λ1과 상기 λ2의 스펙트럼인 것을 특징으로 한다. The spectrum comparison unit "

Detects a spectrum of all wavelengths according to the formula of ", where Tλ is a measurement wavelength, and λ1 and λ2 are two signals located on either side of the measurement wavelength among R signal, G signal, and B signal, the λ1spec and the λ2spec is the spectrum of the λ1 and the λ2.

The present invention is a low-cost CMOS image sensor that captures and analyzes a plurality of LED lighting images to detect the spectrum of each RGB signal wavelength of LED lighting, and then uses this to individually control the brightness value of LED lighting for each type of light emitting device. let it be As a result, the present invention uses a low-cost CMOS image sensor to minimize the cost of implementing the device, while allowing the spectrum of LED lighting to be variously adjusted as desired.

1 is a view showing an LED lighting control device having a spectrum sensing function according to an embodiment of the present invention.
2 is a view for explaining the LED lighting according to an embodiment of the present invention in more detail.
3 is a diagram for explaining in more detail a plurality of light emitting modes according to an embodiment of the present invention.
4 and 5 are diagrams for explaining a spectrum extraction method for each wavelength of an RGB signal of LED lighting according to an embodiment of the present invention.
6 is a view for explaining a spectrum control method of LED lighting according to an embodiment of the present invention.

The following is merely illustrative of the principles of the invention. Therefore, those skilled in the art will be able to devise various devices that, although not explicitly described or shown herein, embody the principles of the present invention and are included within the spirit and scope of the present invention. Further, it is to be understood that all conditional terms and examples listed herein are, in principle, expressly intended solely for the purpose of enabling the concept of the present invention to be understood, and not limited to such specifically enumerated embodiments and states. should be

Moreover, it is to be understood that all detailed description reciting the principles, aspects, and embodiments of the invention, as well as specific embodiments, are intended to cover structural and functional equivalents of such matters. It is also to be understood that such equivalents include not only currently known equivalents, but also equivalents developed in the future, i.e., all devices invented to perform the same function, regardless of structure.

Thus, for example, the block diagrams herein are to be understood as representing conceptual views of illustrative circuitry embodying the principles of the present invention. Similarly, all flowcharts, state transition diagrams, pseudo code, etc. may be tangibly embodied on a computer-readable medium and be understood to represent various processes performed by a computer or processor, whether or not a computer or processor is explicitly shown. should be

1 is a view showing an LED lighting control device having a spectrum sensing function according to an embodiment of the present invention.

Referring to FIG. 1 , the device 100 of the present invention may include an LED light 110 , a CMOS image sensor 120 , a spectrum comparison unit 130 , a spectrum control unit 140 , and an LED control unit 150 . have.

The LED light 110 is implemented with m × n light emitting devices D arranged in a matrix form of m × n as shown in FIG. 2 , and each of the light emitting devices D emits red light again. ), a G light-emitting device GD that emits green light, and a B light-emitting device BD that emits blue light. That is, the LED lighting 110 is composed of an R light emitting element group, a G light emitting element group, and a B light emitting element group, and can generate and output light having various spectra by individually adjusting the brightness of each light emitting element group.

The CMOS image sensor 120 is disposed so as to face the light emitting surface of the LED light 110 , and obtains and outputs i (i is a natural number) images by continuously photographing the LED light 110 .

The spectrum comparator 130 collects and averages all pixel values of each image for each image and RGB signal wavelength to extract the spectrum for each RGB signal wavelength of the LED lighting 110, and then extracts the spectrum for each RGB signal wavelength obtained in advance. , and obtain the spectral deviation for each wavelength of the RGB signal.

As shown in FIG. 3 , the spectrum controller 140 includes a plurality of light emitting modes having different spectral setting values for each RGB signal wavelength, and allows the user to select any one of the plurality of light emitting modes. Accordingly, when the user selects a specific light emitting mode, the spectrum setting value for each RGB signal wavelength corresponding to the selected mode is provided to the spectrum comparator 130 , and then the spectrum deviation for each RGB signal wavelength fed back from the spectrum comparator 130 is applied. Based on the RGB individual control value of the LED lighting is obtained and then provided to the LED control unit 150 .

The LED control unit 150 individually controls the light emission intensity of each of the R light emitting element group, G light emitting element group, and B light emitting element group in the LED lighting according to the individual spectrum control values for each RGB signal wavelength obtained and provided by the spectrum control unit 140 . By doing so, the spectrum for each RGB signal wavelength of the LED lighting 110 finally converges to a spectrum setting value for each RGB signal wavelength corresponding to the current light emitting mode.

4 and 5 are diagrams for explaining a spectrum extraction method for each wavelength of an RGB signal of LED lighting according to an embodiment of the present invention.

First, when i images are obtained by continuously photographing the emission state of the LED lighting 110, RGB signal values ((R11, G11, B11) to (Rnm, Gnm, Bnm)) for each pixel are obtained in units of images.

Then, the RGB signal values ((R11, G11, B11) to (Rnm, Gnm, Bnm)) for each pixel are summed and averaged in units of images to obtain an average RGB signal value for each image (Rnmi, Gnmi, Bnmi).

1) Average value of R signal of i-th image (Rnmi)

Rnmi = (R11 + R12 + … + R1m + R21 + R22 + … + R2m + … + Rn1 + Rn2 + … Rnm) / (n x m)

2) Average value of G signal of i-th image (Gnmi)

Gnmi = (G11 + G12 + … + G1m + G21 + G22 + … + G2m + … + Gn1 + Gn2 + … Gnm) / (n x m)

3) Average value of B signal of i-th image (Bnmi)

Bnmi = (B11 + B12 + … + B1m + B21 + B22 + … + B2m + … + Bn1 + Bn2 + … Bnm) / (n x m)

Then, by summing and averaging the RGB signal average value for each image as a signal unit, the average value (Rspec, Gspec, Bspec) for each RGB signal wavelength of LED lighting is calculated, and this is obtained and provided as an RGB signal spectrum.

1) R signal average value (Rspec)

Rspec = (Rnm1 + Rnm2 + .... + Rnmi) / i

2) G signal average value (Gspec)

Gspec = (Gnm1 + Gnm2 + .... + Gnmi) / i

3) B signal average value (Bspec)

Bspec = (Bnm1 + Bnm2 + .... + Bnmi) / i

In addition, the present invention can detect the spectrum of all wavelength sections in addition to the R signal, G signal, and B signal,

To this end, in the present invention, the R signal, the G signal, and the B signal are set as a reference wavelength that is a reference wavelength for spectrum detection of the measurement wavelength, and the average value of each signal of the R signal, the G signal, and the B signal can be used as a reference spectrum. .

Under this assumption, when a measurement wavelength (arbitrary wavelength to be calculated) is input, two of the R signal, G signal, and B signal are selected as the reference wavelength of the measurement wavelength based on the wavelength similarity to the measurement wavelength, and then the following math A spectral value (Tspec) of the measurement wavelength (Tλ) is calculated according to the equation.

[Equation 1]

In this case, λ1 is a first reference wavelength having a wavelength lower than the measurement wavelength, λ2 is a second reference wavelength having a wavelength higher than the measurement wavelength, λ1spec is a spectrum of the first reference wavelength, and λ2spec is a spectrum of the second reference wavelength.

For example, when the measurement wavelength is set to 491 nm, the spectrum of the measurement wavelength may be calculated as 3.45 according to Equation (2).

[Equation 2]

In this way, in the present invention, not only the R signal, the G signal, and the B signal, but also the spectrum of all wavelength sections can be calculated.

6 is a view for explaining a spectrum control method of LED lighting according to an embodiment of the present invention.

As described above, the present invention has a plurality of light emitting modes and allows different spectrums for each wavelength of an RGB signal to be set for each light emitting mode.

For example, a first emission mode in which R wavelength is intensively emitted, a second emission mode in which R and B wavelengths are intensively emitted, a third emission mode in which B wavelength is intensively emitted, R wavelength, G wavelength, B A fourth light emission mode in which the wavelength is uniformly emitted can be provided.

In this state, when the user selects the first light emitting mode, the spectrum controller 140 obtains a spectrum set value for each RGB signal wavelength of the first light emitting mode and provides it to the spectrum comparator 130 .

Then, the spectrum comparator 130 obtains spectrum extraction values for each RGB signal wavelength from the i images continuously acquired by the CMOS image sensor 120, and compares them with the received spectrum set values for each RGB signal wavelength to obtain the RGB signal wavelength. Acquire the star spectral deviations (ΔR, ΔG, ΔB).

Then, based on the correlation between the previously registered spectral deviation and the output control value, the spectrum controller 140 sets the RGB individual control values ( Rctrl, Gctrl, Bctrl).

Then, the LED control unit 150 individually adjusts the current or voltage intensity applied to each of the R light emitting element group, G light emitting element group, and B light emitting element group of the LED lighting according to the RGB individual control values (Rctrl, Gctrl, Bctrl). The spectrum for each wavelength of the RGB signal of the LED lighting 110 is made equal to the set value of the spectrum for each wavelength of the RGB signal of the first light emitting mode.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and it is common in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those having the knowledge of, of course, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

Claims (3)

LED lighting consisting of R light-emitting element group, G light-emitting element group, and B light-emitting element group, each of which can individually adjust the brightness of each light-emitting element group;
a CMOS image sensor for acquiring and outputting a plurality of images by continuously photographing the LED lights;
Spectral comparison to obtain a spectrum deviation value for each RGB signal wavelength by collecting and averaging the pixel values in the plurality of images for each RGB signal wavelength, extracting a spectrum for each RGB signal wavelength, and comparing with the previously obtained spectrum set value for each RGB signal wavelength wealth;
It has a plurality of light emitting modes, obtains a spectrum set value for each RGB signal wavelength of the light emitting mode selected by a user and provides it to the spectrum comparator, and then according to the spectrum deviation value for each RGB signal wavelength obtained by the spectrum comparator a spectrum control unit that calculates and provides a spectrum control value for each RGB signal wavelength; and
an LED control unit for individually adjusting the brightness values of each of the R light emitting element group, G light emitting element group, and B light emitting element group of the LED lighting according to the spectrum control value for each RGB signal wavelength,
The spectrum comparison unit
"

"Sensing the spectrum of all wavelengths according to consciousness,
The Tλ is the measurement wavelength, the λ1 and the λ2 are two signals located on both sides of the measurement wavelength among the R signal, the G signal, and the B signal, and the λ1spec and the λ2spec are the spectra of the λ1 and the λ2 LED lighting control device with spectrum sensing function. According to claim 1, wherein the spectrum comparison unit
The RGB signal spectrum is obtained and output by summing and averaging the RGB signal values for each pixel of each image by the image unit to obtain the average RGB signal value for each image, and then summing and averaging the RGB signal average value for each image in the signal unit. LED lighting control unit with spectrum sensing function. delete

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