TW201118353A - A novel method and equipment for measuring chromaticity coordinate and intensity of light - Google Patents

Abstract

This invention is related to a novel method and developed equipment for measuring chromaticity coordinate and intensity of light. The associated quantity of CIE chromaticity coordinate and intensity of incident visible light can be accomplished without requiring for expensive instruments, such as integral sphere and spectrometer and so on. By the invention, CIE chromaticity coordinate and intensity of various visible light sources can measured easily and quickly.

Description

201118353 VI. Description of the Invention: [Technical Field] The present invention relates to measurement of light, and more particularly to an apparatus and method for chromaticity coordinates and brightness of measurable light. [Prior Art] When the light source of a certain color is seen by human beings, it is often only subjectively discriminating the color from the mouth, and the actual color matching quantity of the color cannot be directly read, so the Commission Internationale deL'Edairage , CIE) establishes the standard observer's color sensation with the average of the color perception of many normal visual people. In the αΕ color matching experiment, the two primary colors are mixed to match the color of each single-wave light in the spectrum. The number of the two primary colors used in the spectrum is called the spectral tristimulus value, and is represented by R, G, and Β. Usually, we do not directly use the tristimulus value to represent the color, but the relative proportion of the two primary colors in the total amount of R, G, and Β, for example, when the relative brightness ratio of the two primary colors is 丨〇〇〇 〇: 4.5907 : 0.0601, it can match the white light of equal energy, αΕ select this ratio as the unit quantity of the three primary colors of red, green and blue. Therefore, the relative proportion of the three primary colors in the total amount of R, q and b is used to represent The color Ε chromaticity coordinates of the color seen by the human eye. However, to know the CIE chromaticity coordinates and brightness of the visible light source color, it is often necessary to have a test environment as used in the CIE color matching experiment, and generally use the integrating sphere to process the light source into a uniformly diffused beam output, and then cooperate with the spectrometer pair. The light source can be measured, but the price of the instrument is very expensive. In this case, the inventor of the present invention is working to find the chromaticity coordinate and brightness of the measurable light, which can be compared with the foregoing. The electronic components with much lower price of the instrument can detect any visible light source of the human eye and calculate its CIE chromaticity coordinates and brightness. SUMMARY OF THE INVENTION The main object of the present invention is to provide a device and method for measuring the chromaticity of the illuminating beam and brightness, which can easily and quickly measure the CIE chromaticity coordinates and brightness of various human visible light sources. The problem of CIE chromaticity coordinates and brightness of a light source color can be known by solving the measurement by a complicated and expensive instrument. In order to achieve the above object, a device for measuring the chromaticity coordinates and brightness of the light according to the technical idea of the present invention includes at least one photodetector, a multiplexer, an analog-to-digital converter, and an arithmetic processing. And a display. The photodetector is configured to detect a light source and output a plurality of electrical signals corresponding to different wavelength ranges of the light source; the multiplexer is configured to receive the electrical signal output by the optical detector, and the different telecommunication signals Selectively switching the output; the analog-to-digital converter is electrically connected to the multiplexer to receive the electrical signal output by the multiplexer, convert it into a digital signal, and output the same; The device and the analog digital converter are electrically connected to control the multiplexer to switch to receive different electrical signals output by the optical detector, and receive the digital signal output by the analog digital converter, and convert the digital signals into CIE The chromaticity coordinates and the brightness value are output again; the display is electrically connected to the arithmetic processor to display the 201118353 value calculated by the processor; by the above technical means, the measurement is not required by using a complicated and expensive instrument, The CiE chromaticity coordinates and brightness of any source can be measured easily and quickly. The device for chromaticity coordinates and brightness of the above-mentioned measurable light may have a three-light debt detector' and the photodetectors may be made of a photodiode for detecting the light source, and The electrical signals corresponding to the red, green and blue light levels of the light source are respectively output; the optical diodes have low energy consumption, high power, small volume, and rapid response, which can improve the functionality and convenience of the measuring device. In the above device for measuring the chromaticity coordinates and brightness of the light, the operation is converted. Another according to the technical idea of the present invention

The conversion program, as well as the one-to-one tomb, can be a programmable single-chip that stores a parameter matrix that converts the RGB color to the χγζ color system, thereby enabling the measurement device More concise _. What's more, the domain can output different voltage signals corresponding to different wavelength ranges of the light source, and the programmable single chip can store one of the different waveforms (four)

For processing the electrical signal, the multiplex processing program, the analog digital camera, is used to receive the single chip, and the processing signals are used to the optical detector in the same manner. Outputting different signal selective switching outputs of 201118353, the analog-to-digital conversion program is used for converting the multi-signal processing electric signal into a digital signal, and the arithmetic processing program is used to convert the analog digital conversion The digital signal output by the program calculates the CIE chromaticity coordinates and the brightness value and outputs the same; the display is electrically connected to the programmable single chip, and the rib displays the value of the operation processing program 4; by the above technical means, It is also possible to measure the CIE chromaticity coordinates and brightness of any light source simply and quickly without using complex and expensive methods. The device for chromaticity coordinates and brightness of the above-mentioned measurable light may have three photodetectors, and the photodetectors may be made of photodiodes for detecting the light source and respectively outputting pairs The electric sfl number of the red, green and blue light of the light source should be used, thereby improving the functionality and convenience of the measuring device. According to the technical idea of the present invention, a method for measuring the chromaticity coordinates and brightness of a light is to first drive a light source with a rated current, and then use a spectrometer and an integrating sphere to measure the red, green and blue light of the light source. The spectrum of the wavelength range, which in turn obtains the first stimulus values R0, G0, B0 of the light source in the RGB color system, and then passes through the CIE 1931 2-deg XYZ Color Matching Functions (CIE 1931 2-deg XYZ Color Matching Functions) The stimulating values of the spectra in the χγζ color system are added to obtain the second stimuli values χ〇, γ〇 and Ζ〇 of the light source in the ΧΥΖ ΧΥΖ Ζ〇 system, and R 〇, G 〇, B 〇, X 〇, γ 〇 And z〇 are substituted into the following first equations such as r, G, B, X, γ, and z: 201118353

X" Rx Οχ Βχ· ΊΓ Y — Ry °y By G Z _RZ Gz Bz B Get the following parameter matrix: X Gx Βχ·

Ry Gy By,

Rz Gz Bz_

The parameter moment consumption M converts the stimulus value of the light source of the RGB color system into the stimuli value of the χγζ color system; and uses at least L(7) to measure the red, green and blue light immunity of the respective light source. The electric a Vr, vg, vb, and then use the following two equations for converting the red, green, and blue light intensities of the light source to be tested to one of the stimulation values of the electro-ink and RGB color system:

Gi

Vr, vg, vb are substituted into the parameters of Vr, %, %, etc. of the second equation, and (4) the light source to be tested is in the RGB color system - the first chromaticity center (Rt Gt Bt) is the light source to be tested The brightness of red, green and blue light; use one of the following third-party programs: X' "Rx Gx Bx- 'K Yt = Ry Gy By Gt person _Rz g2 b2 Calculate the fine: 3⁄4 is derived from the color of the color - a second chromaticity coordinate (Xt, Yt, Zt); using a fourth equation χ =--^_,

Xt+Yt+Zt 201118353 and a fifth equation 丫=_____Σ_, one of the light sources to be tested

Wzt quadratic chromaticity coordinates (X, y). Detailed construction, features, assembly or use of the apparatus and method for chromaticity coordinates and brightness of the smear of the sizing provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited to the scope of the invention. The following is a detailed description of the technical content and features of the present invention by the accompanying embodiments in conjunction with the accompanying drawings in which: FIG. Block diagram of the chromaticity coordinates and brightness of the metering; FIG. 1 is a block diagram of the method for measuring the chromaticity coordinates and the intensity of the measurable light provided by the first preferred embodiment of the present invention; 3 is a block diagram of a device for measuring the chromaticity coordinates and brightness of a measurable light according to a second preferred embodiment of the present invention; and FIG. 4 is a measurable measurement according to a third preferred embodiment of the present invention. A block diagram of a device for chromaticity coordinates and brightness of light; and a block diagram of a programmable single chip of the device for measurable optical chromaticity of the third preferred embodiment. As shown in the first figure, a device 10 for chromaticity coordinates and brightness of a measurable light according to a first preferred embodiment of the present invention includes a photoelectric conversion circuit 20, a processing unit 30, and a liquid crystal display. 40. The photoelectric conversion circuit 20 has a function of detecting a light source and outputting photoelectric signals corresponding to luminances of different wavelengths included in the light source. The photoelectric conversion circuit 20 includes a three-light detecting diode 22, a three-low-pass filter 24, and three first amplifiers 26; each of the light detecting diodes 22 is configured to detect that a light source device 50 emits The light visible to the human eye, according to the received optical signals of different wavelengths, respectively detects the brightness of red, green and blue light, and converts them into electrical signals such as photocurrent or photovoltage corresponding to the brightness, and outputs them to the respective signals. Each of the low-pass filters 24 is electrically connected to each of the photodetecting diodes 22 and the first amplifiers 26, and each of the low-passing filters 24 respectively receives the photodetecting diodes After each of the electrical signals output by the body 22, the high frequency noise from the circuit ambient noise is filtered out, and the relatively stable electrical signal is obtained, and then output to the first amplifier 26; the first amplifier 26 is electrically connected. The processing unit 30 is connected to each of the first amplifiers 26 to receive the electrical signals output by the low-pass filters 24, and is amplified and output to the processing unit 30. Of course, the filters 24 are not necessary for the present invention. If the circuit design has high-quality environmental noise isolation devices, the elimination of the filters 24 can reduce the power attenuation caused by the filtering. The circuit space occupied by the filter components, and the amplification power required by the amplifiers in the subsequent stages of the circuit; not only reduces the circuit size but also reduces the circuit cost, and still achieves the effect desired by the invention. The processing unit 30 includes a multiplexer 32, a second amplifier 34, an analog-to-digital converter 36, and an arithmetic processor %; the processing unit 30 receives the telecommunications output by the first amplifiers 26 The multiplexer 32 selectively switches the light detecting diodes 22 to switch the respective electrical signals to the second genre; the second amp 34 receives the multiplex The electrical signal output by the processor 32 is amplified and increased in resolution, and then output to the analog-to-digital converter 36. The analog-to-digital converter 36 receives the electrical signal output from the second amplifier and converts it. After being a digital signal, it is output to the operation processor 38. The operation processor 38 has a programmable single chip, and the digital output of the analog-to-digital converter 36 can be output by a program written and stored in the internal program. The Ε chromaticity coordinates and brightness of the light emitted by the device (%). The liquid crystal display 40 is electrically connected to the processing unit 3 for processing the signal output by the arithmetic processor 38, and displaying the CIE chromaticity coordinates and brightness of the light emitted by the light source device 50. Produced by: t is the chromaticity coordinate and bright two-way of the measurable light provided by the embodiment, and is set to '0', wherein the operation processor 38 has a wide operation; the chromaticity of the measurement The important method of coordinates and brightness is to refer to the second figure. The method of calculating the program's method and the method of making the formula are as follows: the example is as follows: coffee r;] the current drive of omA is the three primary colors. Polar body

Green: skin = a spectrometer and an integrating sphere, the amount _ light source blue first wavelength range of the spectrum, and then the light source in the RGB 201118353 color system of the three first stimulus values R0, G 〇, B 〇; and then through CIE 1931 II CIE 1931 2-deg XYZ Color Matching Functions, adding the stimulus values of each of the spectra in the XYZ color system to obtain the second stimulus value of the light source in the ΧΥΖ color system Χ〇, Υ 〇 and Ζ〇; substituting R〇, G0, Β0, Χ〇, Υ〇, and Ζ〇 into the following parameters of R, G, Β, X, Υ, and 第一 of the first equation:

X Κ 〇χ Βχ' R Y — Ry ° By G Z Rz 〇ζ Bz B

Obtaining the parameter moment of converting the RGB color system into the ΧΥΖ color system

Rx Gx B Ry Gy B Gz B 0.665004514 0.286500228 0.001403187 0.081033993 0.326041208 0.036829154 1.469354291 0.295145536 8.092841376 This parameter matrix can therefore be used to convert the stimulus values of any RGB LED source in the RGB color system to the stimulus values of the XYZ color system;

Furthermore, the following second equation: R/ GT = [11.9946 20.2956 3.5378 A. The stimulus value of any RGB LED light source in the RGB color system and the light diode used to detect the red, green and blue light brightness. Corresponding to the voltage signal 'the conversion between the two; when the chromaticity coordinate and brightness of the light metering device 10 detects the light emitted by the light source device 50, and measures the red, blue, and green The voltage value Vr, Vg, Vb corresponding to the light respectively is converted into a digital signal by the analog digital converter 36 in the processing unit 3, and then input to the arithmetic processor 38, which utilizes the second equation By substituting the voltage values Vr, Vg, and Vb into the voltage parameters VR, VG, and VB of the second equation, respectively, the light commands emitted by the light source device 50 can be calculated to represent red, blue, and green lights, respectively. The third brightness values Rt, Gt, and Bt; the following third-party program is additionally utilized in the operation processor 38: X' Ό.665004514 0.081033993 1.469354291"Rt" Yt = 0.286500228 0.326041208 0.295145536 Gt Λ _ 0.001403187 0.036829154 8. 092841376 Λ.

And using the parameter matrix obtained as described above, converting the brightness values Rt, ^ and Bt calculated by the second equation into the corresponding three XYZ color system stimulation values Xt, Yt and Zt, which may also be expressed as The light emitted by the light source device 50 is at one of the chromaticity coordinates of the XYZ color system (xt 'Yt,

Zt); the arithmetic processor 38 also utilizes a fourth equation: _ Xt X~^+Yt+Zt,

And the following fifth equation: y =-^-,

Xt+Yt+Zt converts the three stimulus values \, \ and Zt calculated by the third-party program into corresponding two values X, y, which can also be expressed as one of the two rays emitted by the light source device 5〇 Chromaticity coordinates (x, y). Thereby, the operation processor 38 of the chromaticity coordinate and brightness device 10 of the measurable light outputs the light values emitted by the light source device 50, respectively representing the brightness values Rt of red, blue and green light respectively. , Gt* Bt, and 12 201118353 represent the signals corresponding to the values χ and y of the qe chromaticity coordinates, and the liquid crystal display 4 〇 receives the values and displays the values. It is to be noted that, in this embodiment, the photoelectric conversion circuit 2 is configured to detect the light emitted by the light source device (4) by three of the fine-measuring diodes 22, and output the corresponding red, The function of the green and blue light luminance signals, however, 'the manner in which the function is actually achieved is not limited thereto, and the following may be used in the manner of the second preferred embodiment. As shown in the second figure, the apparatus for chromaticity coordinates and brightness of the measurable light provided by the second preferred embodiment of the present invention is the same as that of the apparatus 1 of the first preferred embodiment. The difference between 〇 is that only the part of the photoelectric conversion circuit is the same as the rest of the device. The photoelectric conversion circuit 70 of the present embodiment includes a photodetector 72 having a detection range covering red, green, and blue wavelengths, and a three-pass filter 74 for processing respective wavelengths of light as provided in the above embodiment. And three first amplifiers 76. The photodetector 72 is configured to detect the light that is emitted by the light source device 5〇, and convert the received optical signals of different wavelengths into electrical signals, and then output to each low pass. The chopper 74 is associated with each of the first amplifiers 76. Thereby, the photoelectric conversion circuit 72 of the embodiment can also detect the light emitted by the light source device 50 and control the switching wheel by the processing unit 30 as described in the first preferred embodiment. The electrical signal corresponding to the red, green and blue light brightness is amplified by the processing unit 3, digital analog conversion and arithmetic processing, and finally by the liquid crystal display 40 as described in the first preferred embodiment. The calculated value display 13 201118353 comes out, and the function of measuring the chromaticity coordinates and brightness of the light emitted by the light source device 5G can be achieved. Furthermore, in the first preferred embodiment, the processing unit 3 is configured to input by the multiplexer 32, the second amplifier 34, the analog-to-digital converter 36, and the arithmetic processor 38. The signal is multiplexed, amplified, and digitally analog converted, and performs the function of the operation. However, the manner in which the function is actually implemented is not limited thereto, and one of the following preferred embodiments may be used. The way it is used. As shown in the fourth figure, the apparatus for chromaticity coordinates and brightness of the measurable light provided by the third preferred embodiment of the present invention is the same as that of the apparatus 10 provided by the first preferred embodiment. The only difference is the partial injury of the treatment unit, the rest being identical to the device 10. The processing unit of this embodiment is a programmable single chip 90, which can compose and store a multiplex processing program, a magnifying private type, an analog-to-digital conversion program, and an arithmetic processing program, respectively performing multiplex processing. Processing, amplification processing, analog digital conversion processing, and arithmetic processing steps, as shown in the fifth figure; that is, the functions of the programs are respectively associated with the multiplex processor 32, the second in the first embodiment The amplifier 34, the analog-to-digital converter 36, and the arithmetic processor 38 are identical. Thus, the programmable single-chip 90 of the present embodiment can also receive the signal output from the photoelectric conversion circuits 20, 70 as described in the first or second preferred embodiment, and perform multiplexing. The functions of the amplification processing, the digital analog conversion, and the arithmetic processing are finally displayed by the liquid crystal display 40 as described in the first preferred embodiment, and the calculated value is displayed, that is, the light source device 5G can be measured by 201118353. The function of the chromaticity coordinates and brightness of the emitted light. Finally, it is to be understood that the constituent elements disclosed in the foregoing embodiments are merely illustrative, and the scope of the present invention is limited, and alternatives or variations of other equivalents should also be Covered by the scope of patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a device for chromaticity coordinates and brightness of a measurable light according to a first preferred embodiment of the present invention; FIG. 2 is a first preferred embodiment of the present invention The block diagram of the method for measuring the chromaticity coordinates and the intensity of the measurable light provided by the example; the third figure is the device for the chromaticity coordinate and the brightness of the measurable light provided by the second preferred embodiment of the present invention Figure 4 is a block diagram of a device for providing t-photometric chromaticity coordinates and brightness of a third preferred embodiment of the present invention; and a fifth preferred embodiment of the present invention Step block for programmable single wafer of chromaticity coordinates and brightness device provided by the example 201118353 [Description of main component symbols] [First preferred embodiment] Chromaticity coordinate and brightness of measurable light Device 10 photoelectric conversion circuit 20 low pass filter 24 processing unit 30 second amplifier 34 light detecting diode 22 first amplifier 26 multiplex processor 32 analog digital converter 36 arithmetic processor 38 liquid crystal display 40 light source device 50 [Second preferred embodiment] light Device 50 Measure the chromaticity coordinate and brightness of light 60 photoelectric conversion circuit 70 photodetector 72 low pass filter 74 first amplifier 76 [third preferred embodiment] light source device 50 measurable light color Degree coordinate and brightness device 80 can be programmed with a single chip 90 16

Claims (1)

201118353 VII. Patent application scope: 1. A device for measuring the chromaticity coordinate and brightness of the light, for measuring the chromaticity coordinates of the visible light source of the human eye, the device comprises: at least one photodetector, used Detecting the light source and outputting a plurality of electrical signals corresponding to different wavelength ranges of the light source; a multiplexer for receiving the electrical signal output by the optical detector, and selectively switching the different electrical signals; φ An analog-to-digital converter is electrically connected to the multiplexer to receive the electrical signal outputted by the multiplexer and convert it into a digital signal and then output; an arithmetic processor, the multiplexer and the analog digital The converter is electrically connected to 'control the multiplexer to switch the different electrical signals received by the optical detector' and receive the digital signals output by the analog digital converter, and convert the digital signals into CIE chromaticity coordinates and brightness The value is output again; and a display is electrically connected to the arithmetic processor to display the value calculated by the processor. 2. For the chromaticity coordinates and brightness of the measurable light as described in the scope of the patent application, there are three light detectors, which are made of optical diodes. The light source is detected and the electrical signals corresponding to the red, green and blue light levels of the light source are respectively rotated. 3. The apparatus for chromaticity coordinates and brightness of the measurable light as described in claim 1 or 2, wherein the arithmetic processor is a programmable single crystal and the programmable single wafer is stored Convert the RGB color system to the parameter matrix of the XYZ color system. 201118353 4 2. For the chromaticity coordinates and the degree of freedom of the metering as described in the third paragraph of the patent application, wherein the optical _ _ is a voltage signal corresponding to a different wavelength range of the light source, the programmable signal The wafer is stored with a voltage conversion corresponding to different wavelengths into an RGB table (four), a conversion type. 5. A device for measuring the chromaticity coordinates and brightness of the measurable light for measuring the chromaticity coordinates of the visible light source of the human eye, the device comprising: at least one photodetector for detecting the light source And outputting a plurality of electrical signals corresponding to different wavelength ranges of the beta light source; - a programmable single chip containing a plurality of programs for receiving the optical output of the optical H output, and respectively using the programs The electronic signals are processed in sequence, and the programs are sequentially: - the multiplex processing program is used to selectively switch and output different electrical signals output by the optical detector; and the analog-to-digital conversion program is used Converting the electrical signal outputted by the multiplex processing program into a digital signal and then outputting it; and - computing processing the digital signal outputted by the analog-to-digital conversion program to calculate the CIE chromaticity coordinate and the brightness value. And a display electrically connected to the programmable single chip for displaying the value calculated by the operation processing program. • ' 6. If the chromaticity coordinates and brightness of the measurable light described in item 5 of the patent application range are stored, the three light sides are stored and the photodetectors are made of photodiodes. The light source is detected and the electrical signals corresponding to the red, green and blue light of the light source of 201118353 are respectively output. 7. A method for measuring the chromaticity coordinates and brightness of a light meter, comprising the steps of: a) providing a light source covering the wavelength ranges of three primary colors of red, green and blue; b) measuring using a spectrometer and an integrating sphere, respectively The spectrum of the red, green and blue wavelength ranges of the light source, thereby obtaining the first stimulation values R〇, G〇, B〇 of the light source in the RGB color system; c) adding the stimulus values of the spectra in the XYZ color system through the CIE 1931 second degree color matching function to obtain the second stimulation values X〇, Y〇 and Z〇 of the light source in the XYZ color system; d) substituting the first stimulation values R〇, G〇, B〇 of the light source, and the second stimulation values X〇, Y〇, and Z〇 into the R, G, and B of the first first equation, respectively. Among the parameters X, Y and Z: X" Rx Gx Bx RY Ry Gy By GZ Rz Gz Bz_ B Obtain the following parameter matrix: Rx Gx Bx Ry Gy By , Rz Gz Bz This parameter matrix is used to convert any wavelength containing three primary colors The stimulus value of the light source in the RGB color system is converted into the stimulus value of the XYZ color system; e) the first voltage Vr corresponding to the red, green and blue light brightness of the light source to be tested is measured by using at least one photodetector The second voltage Vg, and the third voltage Vb; 201118353 f) using the following two equations for converting the red, green, and blue light luminance corresponding to the light source to be tested and the RGB color system stimulus value: Rt1 Γν^ι GT = [R,.丨Β丨jvG, aJ lvB_ X' Rx GX Βχ~ V Yt 二 Ry Gy By 〇t Λ. A Gz Bz Λ. Substituting the voltages Vr, Vg, Vb measured in step e) into the second equation In the parameters of VR, VG, VB, etc., the first chromaticity coordinate (艮, Gt, Bt) of the light source to be tested in the RGB color system is obtained, that is, the brightness of the red, green and blue light of the light source to be tested; Using a third-party program: Calculate the source of the light to be measured in the second color of the XYZ color system (Xt, Yt, Zt); xh) using a fourth equation: v-_ Xt xt+Yt+ Zt, and a fifth equation: y = , xt+Yt+zt to change the second-order chromaticity coordinate (X, y ) of the light source to be tested