CN109655233A - A kind of multichannel light spectrum image-forming display screen Systems for optical inspection and its detection method - Google Patents
A kind of multichannel light spectrum image-forming display screen Systems for optical inspection and its detection method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0202—Mechanical elements; Supports for optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
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- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
- G01J2003/2826—Multispectral imaging, e.g. filter imaging
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Abstract
A kind of multichannel light spectrum image-forming display screen Systems for optical inspection and its detection method, belong to display screen technical field of optical detection, solves the technical issues of machine vision method is then not comprehensive enough for the detection of single pixel point, imaging brightness meter shortage analyzes display screen optical information comprehensively.A kind of solution are as follows: multichannel light spectrum image-forming display screen Systems for optical inspection, it includes light source, integrating sphere, imaging lens, beam splitter, camera, multi-channel optical fibre fixator, path multiplexing device, spectrometer, laser and rangefinder, successively pass through system calibration, display screen optical detection to be measured, the light issued with shots display screen to be measured, 16 road optical fiber and spectrometer collection correspond to display screen matrix spectrum as plane, the auxiliary focusing for passing through laser and camera simultaneously makes to correspond exactly to pixels of display screen per optical fiber all the way.By the calibration analysis to spectrum, the parameters such as spatial distribution, brightness, coloration of the available pixel comprehensively make analysis to the display quality of display screen.
Description
Technical field
The invention belongs to display screen technical field of optical detection, and in particular to a kind of multichannel light spectrum image-forming display screen optics inspection
Examining system and its detection method.
Background technique
Display screen is a kind of flat panel display equipment, is formed by thousands of a chips or combination of pixels, and it is complete to be chiefly used in display
The information such as coloured picture picture, video.The major parameter of display screen optics (light measurement, colorimetry) quality testing be display screen brightness,
Coloration and uniformity.The detection mode of present mainstream, first is that being detected by brightness measurement instrument, second is that passing through machine vision
And image processing techniques analyzes brightness and coloration between each pixel etc. and shows quality index.Brightness measurement instrument generally comprises
The instruments such as luminance meter, color analyzer.According to professional standard, " SJ/T11281-2007 light emitting diode (LED) is shown when measurement
Shield test method ", probe acquisition range need to include the light that no less than 16 adjacent pixels issue around pixel to be measured when acquisition
[Lu Rongqing " LED display brightness measurement method and measuring instrument "].The side of imaging effect is analyzed by image processing techniques
Method needs first to acquire the image of current display screen, then by calculate the parameters such as mean value, standard deviation and average gradient of picture come
Analyze the indexs such as brightness, coloration and the uniformity of the display screen [Yang Yanchun " Quality Measures for Image Fusion Review Study "].
But these modes have its disadvantage.Machine vision method is then not comprehensive enough for the detection of single pixel point.Single-point brightness
Measuring instrument can only once detect a point, measure next target point after needing manual change, cumbersome and inconvenient, single
What spot meter obtained is average value, cannot detect the parameter value of single pixel.Imaging brightness meter is capable of measuring brightness, coloration point
Cloth, but lack spectral information, shortage analyzes display screen optical information comprehensively.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the present invention provides a kind of multichannel light spectrum image-forming display screen optics
Detection system and its detection method, the light issued with shots display screen to be measured, 16 road optical fiber and spectrometer collection picture
Plane corresponds to display screen matrix spectrum, while passing through the auxiliary focusing of laser and camera, makes to correspond exactly to show per optical fiber all the way
Display screen pixel.It is analyzed by the calibration to spectrum, the parameters such as spatial distribution, brightness, coloration of the available pixel, entirely
Analysis is made to face to the display quality of display screen.
The present invention is achieved by the following technical programs.
A kind of multichannel light spectrum image-forming display screen Systems for optical inspection, it include light source, integrating sphere, imaging lens, beam splitter,
Camera, multi-channel optical fibre fixator, path multiplexing device, spectrometer, laser and rangefinder, in which:
The light of the light source is incident by the entrance of integrating sphere and uniformly mixes in integrating sphere, and the light source is known light
Compose the light source of spoke Luminance Distribution, light after evenly mixing is emitted from the outlet of integrating sphere, light pass sequentially through imaging lens and
Beam splitter reaches fibre-optical fixator, and the light signal output end of fibre-optical fixator is inputted by the optical signal of optical fiber and path multiplexing device
End connection, the light signal output end of path multiplexing device pass through the optical fiber light with the optical signal input of spectrometer and laser respectively
The signal output end of signal output end connection, spectrometer is connected by the signal input part of USB connecting line and computer, laser
Signal output end connected by the signal input part of USB connecting line and computer；
The rangefinder is set at imaging lens position, rangefinder for measure imaging lens and integrating sphere outlet or to
The distance between display screen is surveyed, the signal output end of rangefinder is connected by the signal input part of USB connecting line and computer；
The camera is set at beam splitter position, and camera is used to observe imaging effect, the signal of camera by beam splitter
Output end is connected by the signal input part of USB connecting line and computer；
The beam splitter, camera, multi-channel optical fibre fixator and path multiplexing device are set on mobile platform, mobile platform
Lower section is provided with guide rail, and the motor for driving mobile platform to slide along guide rail is provided on mobile platform, and motor driven is mobile
Platform is slided along guide rail for adjusting imaging surface position, and motor is connected by the signal output end of signal wire and computer.
Further, the light source and integrating sphere are for calibrating multichannel light spectrum image-forming display screen Systems for optical inspection.
Further, the path multiplexing device is for circuiting sequentially in 16 road optical fiber of selection all the way.
A kind of detection method of multichannel light spectrum image-forming display screen Systems for optical inspection, comprising the following steps:
S1, system calibration
The light of the light source of known spectra spoke Luminance Distribution is incident by the entrance of integrating sphere and uniform in integrating sphere
Mixing, light after evenly mixing are emitted from the outlet of integrating sphere, and light source and integrating sphere group are combined into regulation light source, and camera is by dividing
Beam device observes regulation light source imaging effect, by adjusting camera lens focusing until blur-free imaging, or pass through motor driven
Mobile platform is slided along guide rail, adjusts the position of fibre-optical fixator until blur-free imaging, stadia surveying imaging lens and integral
The distance between ball outlet；
According to optical system as plane spectral irradiation level formula, path multiplexing device is circuited sequentially in 16 road optical fiber of selection
The calibration factor K per optical fiber all the way is established according to the relationship of time of integration t and number of photons distribution C (λ) per individually calibration all the way
(λ)；
Wherein, optical system is as plane spectral irradiation level formula are as follows:
In formula, τ is optical system transmittance, fmFor aperture,F is optical system focal length, and D is optical system hole
Diameter, U are the distance that camera lens equivalent optical center is exported away from integrating sphere, and L (λ) is light source light spectrum spoke Luminance Distribution；
Per calibration factor K (λ) all the way are as follows:
In formula, t is the time of integration, and K (λ) is calibration factor, and E (λ) is optical system as plane spectral irradiation level, and C (λ) is
Number of photons distribution；
S2, display screen optical detection to be measured
Before display screen to be measured is set to the camera lens of camera, camera is observed display screen to be measured light source to be measured by beam splitter and is imaged
Effect is slided along guide rail up to blur-free imaging, or by motor driven mobile platform by adjusting the lens focusing of camera, is adjusted
The position of whole fibre-optical fixator until blur-free imaging, laser by path multiplexing device select reversible optical path realize 16 road optical fiber with
Display screen matrix point location, the distance between stadia surveying imaging lens and display screen to be measured Ud；Between pixels of display screen
DistanceIn formula, U be distance of the camera lens equivalent optical center away from display screen, V be camera lens equivalent optical center away from
The distance of image planes, d ' are the distance between pixels of display screen observed by imaging surface；
By number of photons distribution C (λ) measured and time of integration t, display to be measured is back-calculated to obtain according to calibration factor K (λ)
The spectral radiance of screen is distributed L (λ) are as follows:
In formula, L (λ) is that the spectral radiance of display screen to be measured is distributed, fmFor aperture, τ is optical system transmittance, and U is
The distance that camera lens equivalent optical center is exported away from integrating sphere, K (λ) are calibration factor, and t is the time of integration, and C (λ) is number of photons point
Cloth；
Pass through brightness-formula againIn formula, V (λ) is spectral luminous efficiency function, L (λ)
It is distributed for the spectral radiance of display screen to be measured, obtains the brightness value of display screen to be measured；
S3, the data source by converting 16 road optical fiber obtain the spectroscopic data of corresponding 16 pixels and bright
Then angle value calculates corresponding chromatic value according to standard colorimetric formula to obtain the luminance uniformity in corresponding region.
Further, in the step S1, the method at camera lens equivalent optical center is determined are as follows:
A. it uses tight shot: camera lens bottom being obtained by rangefinder and exports distance U away from integrating sphered, pass through calculating
The position of mobile platform is obtained as plane separation camera lens bottom or display screen distance V to be measuredd, bring equation intoIn formula, f is tight shot focal length, can solve equivalent optical center and camera lens distance from bottom δ, object
Away from U=Ud- δ, image distance V=Vd-δ；
B. use zoom lens: to any focal length f, by rangefinder obtain camera lens bottom exported away from integrating sphere or to
Survey display screen distance Ud1And Ud2, the position by calculating mobile platform is obtained as plane separation camera lens distance from bottom Vd1And Vd2, will be upper
It states two groups of numerical value and brings equation group into:
Wherein, δ is the position at current lens equivalent optical center, and f is current focus.
Further, in the step S3, chromatic value includes: chromaticity coordinates, purity, correlated colour temperature, colour rendering index
And colour gamut.
Further, the τ need not be tested in practical applications, and the τ during Testing And Regulating is mutually about removed.
Compared with prior art the invention has the benefit that
1, by adjusting display screen and imaging surface position, system can be converted between amplifying and reducing both of which, be suitble to not
Display screen with resolution ratio is tested, and can realize that distance includes that pel spacing measures.
2, compatible universal luminance meter can not only survey whole screen brightness and color, but also can focus single pixel test.
3, using 16 road fiber laser arrays spatial distributions, so that testing result is more quickly comprehensively reliable.
4, reversible using optical path, laser realizes 16 Lu Dingwei, and camera auxiliary precisely focuses.
Detailed description of the invention
Fig. 1 is multichannel light spectrum image-forming display screen Systems for optical inspection structural schematic diagram.
In figure, 1-1 is light source, and 1-2 is integrating sphere, and 2 be display screen to be measured, and 3 be imaging lens, and 4 be beam splitter, and 5 be phase
Machine, 6 be fibre-optical fixator, and 7 be optical fiber, and 8 be path multiplexing device, and 9 be spectrometer, and 10 be laser, and 11 be rangefinder, and 12 be meter
Calculation machine, 13 be USB connecting line, and 14 be guide rail, and 15 be motor.
Fig. 2 is laser positioning optical fiber and pixel relative position lab diagram, and circled is position corresponding to optical fiber in figure.
Fig. 3 is spectrum obtained by fiber-optic probe all the way in 16 road optical fiber.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Embodiment one
A kind of multichannel light spectrum image-forming display screen Systems for optical inspection as shown in Figure 1, it includes light source (1-1), integrating sphere
(1-2), imaging lens 3, beam splitter 4, camera 5, multi-channel optical fibre fixator 6, path multiplexing device 8, spectrometer 9,10 and of laser
Rangefinder 11, in which: the light of the light source 1-1 is incident by the entrance of integrating sphere 1-2 and uniformly mixes in integrating sphere 1-2,
The light source 1-1 is the light source of known spectra spoke Luminance Distribution, and light after evenly mixing is emitted from the outlet of integrating sphere 1-2,
Light passes sequentially through imaging lens 3 and beam splitter 4 reaches fibre-optical fixator 6, and the light signal output end of fibre-optical fixator 6 passes through light
Fibre 7 is connect with the optical signal input of path multiplexing device 8, the light signal output end of path multiplexing device 8 pass through optical fiber 7 respectively with light
The optical signal input of spectrometer 9 is connected with the light signal output end of laser 10, and the signal output end of spectrometer 9 is connected by USB
Wiring 13 is connect with the signal input part of computer 12, and the signal output end of laser 10 passes through USB connecting line 13 and computer
12 signal input part connection；
The rangefinder 11 is set at 3 position of imaging lens, and rangefinder 11 goes out for measuring imaging lens 3 with integrating sphere
The distance between mouthful, the signal output end of rangefinder 11 is connect by USB connecting line 13 with the signal input part of computer 12；
The camera 5 is set at 4 position of beam splitter, and camera 5 is used to observe imaging effect by beam splitter 4, camera 5
Signal output end is connect by USB connecting line 13 with the signal input part of computer 12；
The beam splitter 4, camera 5, multi-channel optical fibre fixator 6 and path multiplexing device 8 are set on mobile platform, mobile flat
It is provided with guide rail 14 below platform, the motor 15 for driving mobile platform to slide along guide rail 14 is provided on mobile platform, electricity
Machine 15 drives mobile platform to slide along guide rail 14 for adjusting imaging surface position, and motor 15 passes through the letter of signal wire and computer 12
The connection of number output end.
Further, the light source 1-1 and integrating sphere 1-2 is for calibrating multichannel light spectrum image-forming display screen optical detection system
System.
Further, the path multiplexing device 8 is for circuiting sequentially in 16 road optical fiber of selection all the way.
The detection method of a kind of multichannel light spectrum image-forming display screen Systems for optical inspection as shown in Figure 1 to Figure 3, in this implementation
In example one, is calibrated and is measured using the tight shot of a focal length 105mm, comprising the following steps:
S1, system calibration
It is combined using the light source 1-1 and integrating sphere 1-2 of known spectra spoke Luminance Distribution, available theory brightness value and reality
Survey the calibration factor between photon numerical value.
According to optical system as plane spectral irradiation level formulaIn known luminaire brightness
When with the distance of distance of camera lens light source and the focal length of camera lens and pore size, available irradiance value.According to time of integration t
It is distributed C (λ) with number of photons, is respectively obtained per calibration factor all the way
According to the relationship of optical system object distance, image distance and focal lengthBy rangefinder 11 obtain camera lens bottom away from
The distance U of light source integrating sphere outletd, plane separation camera lens distance from bottom V is obtained by calculating 14 position of guide raild, bring equation intoEquivalent optical center and camera lens distance from bottom δ can be solved.Equivalent is away from U=U at this timed- δ, etc.
Imitate image distance V=Vd+δ。
The tight shot of focal length 105mm, aperture size 2.8 are used in the present embodiment one.Integrating sphere 1-2 is exported when calibration
From camera lens bottom distance UdFor 330mm, mode is being reduced in camera lens work at this time.It is logical with the selected optical fiber all the way of light path multiplexer 8
Road.Lens focusing is adjusted, or clear until being imaged with the position of 15 synchronous adjustment beam splitter 4 of motor, camera 5 and fibre-optical fixator 6
It is clear, distance V of the imaging surface away from camera lens bottomdFor 97mm.Substitute into equationIt can solve in equivalent optical
Distance δ of the heart away from camera lens bottom is 89.2mm, and available equivalent is away from U=Ud- δ=240.8mm.
Calibration factor can be obtained in conjunction with the time of integration by reading spectroscopic dataτ can need not be calculated,
It mutually can about be removed when testing procedure below.Optical-fibre channel is selected in turn with light path multiplexer 8, is repeated S1 calibration steps, is obtained
All channel calibration factors.
In order to compare the accuracy of calculated result, same standard sources is detected.It is logical with the selected optical fiber all the way of light path multiplexer 8
Road.The specific location that optical fiber is detected and the relative positional relationship with the outlet integrating sphere 1-2 are determined with laser 10.Adjust camera lens
Focusing, or with 15 synchronous adjustment beam splitter 4 of motor, the position of camera 5 and fibre-optical fixator 6 is until imaging clearly.Use computer
12 read spectroscopic data at this time.Rangefinder 11 measures the outlet integrating sphere 1-2 and camera lens bottom distance Ud, calculate mobile platform
Position determines imaging surface and camera lens bottom distance Vd.Camera lens equivalent optical center is similarly determined according to content described in preceding step.?
It should be to spectral luminance factor distribution at this timeAgain by brightness calculation formulaThe brightness value of the available pixel.
In the present embodiment one, by the outlet integrating sphere 1-2 and camera lens bottom Ud=300mm, be computed equivalent optical center away from
The object distance U=210.8mm of the outlet integrating sphere 1-2, measures number of photons C (λ) and time of integration t at this time.Above-mentioned formula is substituted into, it can
To obtain the brightness of light source at this time.The brightness value being calculated (is shown in Table 1) compared with standard value, it can be seen from Table 1 that meter
Calculation value error within an acceptable range, therefore, it is considered that this method calculate brightness be effective.
Similarly, change test condition, work as UdIt is changed to 320mm, it can be seen that error is still less than 10%.Work as UdWhen for 300mm
When aperture size is changed to 4 and 5.6, error increase, it may be possible to aperture becomes smaller, the position of test be varied extremely.
Above-mentioned testing procedure, available 16 groups of data are repeated in 16 road optical fiber.16 groups of data are divided
The brightness uniformity of the pixel in surveyed region can be obtained in analysis, and test result see the table below 1.
The measurement brightness value and standard value comparison sheet of 1 embodiment of table, one standard sources
S2, display screen optical detection to be measured
With the selected optical-fibre channel all the way of light path multiplexer 8.With laser 10 determine the specific location that is detected of optical fiber and with
The relative positional relationship of display screen matrix.It, can by calculating the pixel number between two optical fiber since fiber position is fixed
To learn the distance between imaging surface pixel.By calculating the ratio between object distance U and object distance V, display can be calculated
The distance between screen image vegetarian refreshments, i.e.,U is distance of the camera lens equivalent optical center away from display screen, and V is camera lens equivalent optical
Distance of the center away from imaging surface, d are the distance between pixels of display screen, and d ' is between pixel observed by imaging surface
Distance.
Adjust lens focusing, or with 15 synchronous adjustment beam splitter 4 of motor, the position of camera 5 and fibre-optical fixator 6 until at
As clear.Spectroscopic data at this time is read with computer 12.Rangefinder 11 measures display screen to be measured and camera lens bottom distance Ud,
It calculates mobile platform position and determines imaging surface and camera lens bottom distance Vd.Camera lens equivalent optical center is similarly according to the method described above
It determines.The spectral luminance factor distribution obtained at this time should beAgain by brightness calculation formulaThe brightness value of the available pixel.
In the present embodiment one, display screen 2 to be measured and camera lens bottom distance Ud=358mm, equivalent light can be obtained by being computed
Object distance U=268.8mm, equivalent image distance V=172.3mm of the center away from display screen 2, measure number of photons C (λ) at this time.It substitutes into
Above-mentioned formula, the brightness of available light source at this time.Two optical fiber of lie farthest away on a column are taken, fibre-optical fixator designs spacing
For 11.4mm, can be seen that between two optical fiber from optical fiber and pixel relative position figure at a distance of 13 pixels of display screen.It can be with
Calculate between pixels of display screen observed by imaging surface distance d ' be 0.88mm, substitute into equationIt further calculates
Obtaining distance d between actual displayed screen image vegetarian refreshments is 1.4mm.
Above-mentioned testing procedure, available 16 groups of data are repeated in 16 road optical fiber.16 groups of data are divided
The brightness uniformity of the pixel in surveyed region can be obtained in analysis, and test result see the table below 2.
20 six road fiber laser arrays of table brightness of display screen test result table to be measured
| Optical fiber number | Measure brightness (Cd/m2) | Optical fiber number | Measure brightness (Cd/m2) |
| 1 | 1445.6 | 9 | 611.7 |
| 2 | 807.3 | 10 | 789.5 |
| 3 | 955.1 | 11 | 2107.3 |
| 4 | 909.5 | 12 | 1155.1 |
| 5 | 1042.4 | 13 | 863.8 |
| 6 | 967.3 | 14 | 1921.1 |
| 7 | 664.2 | 15 | 706.4 |
| 8 | 853.2 | 16 | 675.8 |
Embodiment two
In the present embodiment two, the structure of multichannel light spectrum image-forming display screen Systems for optical inspection is the same as example 1.
A kind of detection method of multichannel light spectrum image-forming display screen Systems for optical inspection uses one in the present embodiment two
The zoom lens of focal length 24mm-105mm is calibrated and is measured, comprising the following steps:
S1, system calibration
Calibrating principle is identical as first case study on implementation.
Utilize formulaAnd utilize equation groupWherein Ud1、Vd1And Ud2、
Vd2, and it is two groups of camera lens bottoms respectively away from object plane distance, as plane separation camera lens distance from bottom, δ is camera lens bottom to equivalent light
The distance at center, f are current lens focal lengths.The position of current focal length and equivalent optical center can be obtained in solution equation group
It sets.
The zoom lens that focal length 24mm-105mm is used in the present embodiment two, to determine calculated result accuracy, by focal length
It is set to 105mm, focusing ring is fixed on macro mode, aperture size 2.8, and integrating sphere 1-2 is exported from camera lens bottom when calibration
Distance Ud1For 402mm.With the selected optical fiber all the way of light path multiplexer 8.With motor synchronous adjustment beam splitter 4, camera 5 and optical fiber are fixed
Position of the device 6 until being in imaging clearly.Distance V of the camera lens bottom away from imaging surface is obtained by calculating 14 position of guide raild1For 40mm.
Change Ud2For 419mm, V is obtainedd2For 33mm, equation group is substituted into together with first group of dataIt is 138.2mm that δ is obtained after solution equation group, and focal length f is 106.4mm, with accurate focus error
It is 1.3%, it is believed that the algorithm is reliable.Know equivalent away from U1=Ud1- δ=263.8mm, U2=Ud2- δ=280.8mm.With calculating
Machine 12 reads spectroscopic data at this time.In conjunction with time of integration t, calibration factor can be obtainedτ can need not be counted
It calculates, mutually can about be removed when testing procedure below.Optical-fibre channel is selected in turn with light path multiplexer 8, repeats above-mentioned calibration steps,
Obtain all channel calibration factors.
In order to compare the accuracy of calculated result, same standard sources is detected.It keeps current focus constant, uses path multiplexing
The selected optical fiber all the way of device 8.Adjust lens focusing, or the position with 15 synchronous adjustment beam splitter 4 of motor, camera 5 and fibre-optical fixator 6
It sets until imaging clearly, and determines that the specific location that optical fiber is detected and the relative position exported with integrating sphere close with laser 10
System.Spectroscopic data at this time is read with computer 12.Rangefinder measures integrating sphere outlet and camera lens bottom distance Ud, calculating leads
14 position of rail determines imaging surface and camera lens bottom distance Vd.Camera lens equivalent optical center similarly determines according to the method described above.
The spectral luminance factor obtained at this time is distributed asAgain by brightness calculation formulaThe brightness value of the available pixel.
In the present embodiment two, the outlet integrating sphere 1-2 and camera lens distance from bottom Ud=428mm is computed equivalent optical center
Object distance U=289.8mm away from the outlet integrating sphere 1-2, measures number of photons C (λ) at this time.Above-mentioned formula is substituted into, this time is obtained
The brightness (being shown in Table 3) in source.
Similarly, change test condition, by UdIt is changed to 419mm, 391mm respectively, compares the brightness value being calculated and standard
Value, it can be seen that meet under 391mm preferably, error is larger under 419mm and 428mm, it may be possible to which apart from too long, camera lens is adjusted
Fluctuation.
Above-mentioned detecting step, available 16 groups of data are repeated in 16 road optical fiber.16 groups of data are divided
The brightness uniformity of the pixel in surveyed region can be obtained in analysis, and standard test of light source result see the table below 3.
The measurement brightness value table of 3 embodiment of table, two standard sources
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
It is familiar with those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (7)
1. a kind of multichannel light spectrum image-forming display screen Systems for optical inspection, it includes light source (1-1), integrating sphere (1-2), imaging lens
(3), beam splitter (4), camera (5), multi-channel optical fibre fixator (6), path multiplexing device (8), spectrometer (9), laser (10) and
Rangefinder (11), it is characterised in that:
The light of the light source (1-1) is incident by the entrance of integrating sphere (1-2) and uniformly mixes in integrating sphere (1-2), described
Light source (1-1) is the light source of known spectra spoke Luminance Distribution, and light after evenly mixing is emitted from the outlet of integrating sphere (1-2),
Light passes sequentially through imaging lens (3) and beam splitter (4) reaches fibre-optical fixator (6), the optical signal output of fibre-optical fixator (6)
End is connect by optical fiber (7) with the optical signal input of path multiplexing device (8), and the light signal output end of path multiplexing device (8) is logical
It crosses optical fiber (7) to connect with the light signal output end of the optical signal input of spectrometer (9) and laser (10) respectively, spectrometer
(9) signal output end is connect by USB connecting line (13) with the signal input part of computer (12), the signal of laser (10)
Output end is connect by USB connecting line (13) with the signal input part of computer (12)；
The rangefinder (11) is set at imaging lens (3) position, and rangefinder (11) is for measuring imaging lens (3) and integral
The signal output end of the distance between ball outlet or display screen to be measured, rangefinder (11) passes through USB connecting line (13) and computer
(12) signal input part connection；
The camera (5) is set at beam splitter (4) position, and camera (5) is used to observe imaging effect, phase by beam splitter (4)
The signal output end of machine (5) is connect by USB connecting line (13) with the signal input part of computer (12)；
The beam splitter (4), camera (5), multi-channel optical fibre fixator (6) and path multiplexing device (8) are set on mobile platform, are moved
It is provided with below moving platform guide rail (14), the electricity for driving mobile platform to slide along guide rail (14) is provided on mobile platform
Machine (15), motor (15) drive mobile platform to slide along guide rail (14) for adjusting imaging surface position, and motor (15) passes through signal
Line is connect with the signal output end of computer (12).
2. a kind of multichannel light spectrum image-forming display screen Systems for optical inspection according to claim 1, it is characterised in that: the light
Source (1-1) and integrating sphere (1-2) are for calibrating multichannel light spectrum image-forming display screen Systems for optical inspection.
3. a kind of multichannel light spectrum image-forming display screen Systems for optical inspection according to claim 1, it is characterised in that: the light
Path multiplexer (8) is for circuiting sequentially in 16 road optical fiber of selection all the way.
4. a kind of detection method of multichannel light spectrum image-forming display screen Systems for optical inspection as described in claim 1, feature exist
In the following steps are included:
S1, system calibration
The light of the light source (1-1) of known spectra spoke Luminance Distribution is incident by the entrance of integrating sphere (1-2) and in integrating sphere
It is uniformly mixed in (1-2), light after evenly mixing is emitted from the outlet of integrating sphere (1-2), light source (1-1) and integrating sphere (1-
2) group is combined into regulation light source, and camera (5) observes regulation light source imaging effect by beam splitter (4), by adjusting the mirror of camera (5)
Head focusing drives mobile platform to slide along guide rail (14) up to blur-free imaging, or by motor (15), adjusts fibre-optical fixator
(6) position is until blur-free imaging, rangefinder (11) measure the distance between imaging lens and integrating sphere outlet；
According to optical system as plane spectral irradiation level formula, path multiplexing device (8) is circuited sequentially in 16 road optical fiber of selection
The calibration factor K per optical fiber all the way is established according to the relationship of time of integration t and number of photons distribution C (λ) per individually calibration all the way
(λ)；
Wherein, optical system is as plane spectral irradiation level formula are as follows:
In formula, τ is optical system transmittance, fmFor aperture,F is optical system focal length, and D is optical system aperture, U
For the distance that camera lens equivalent optical center is exported away from integrating sphere, L (λ) is light source light spectrum spoke Luminance Distribution；
Per calibration factor K (λ) all the way are as follows:
In formula, t is the time of integration, and K (λ) is calibration factor, and E (λ) is optical system as plane spectral irradiation level, and C (λ) is photon
Number distribution；
S2, display screen optical detection to be measured
Before display screen (2) to be measured is set to the camera lens of camera (5), camera (5) observes display screen (2) to be measured by beam splitter (4)
Light source imaging effect to be measured moves by adjusting the lens focusing of camera (5) up to blur-free imaging, or by motor (15) driving
Moving platform is slided along guide rail (14), adjusts the position of fibre-optical fixator (6) until blur-free imaging, laser pass through path multiplexing device
(8) select optical-fibre channel, 16 road optical fiber and display screen matrix point location realized by reversible optical path, rangefinder (11) measurement at
As the distance between camera lens (3) and display screen to be measured (2) Ud；The distance between pixels of display screenIn formula, U is mirror
First-class distance of the effect optical centre away from display screen, V are distance of the camera lens equivalent optical center away from imaging surface, and d ' is seen by imaging surface
The distance between pixels of display screen observed；
By number of photons distribution C (λ) measured and time of integration t, display screen to be measured (2) are back-calculated to obtain according to calibration factor K (λ)
Spectral radiance be distributed L (λ) are as follows:
In formula, L (λ) is that the spectral radiance of display screen to be measured (2) is distributed, fmFor aperture, τ is optical system transmittance, and U is mirror
First-class distance of the effect optical centre away from display screen to be measured, K (λ) are calibration factor, and t is the time of integration, and C (λ) is number of photons distribution；
Pass through brightness-formula againIn formula, V (λ) is spectral luminous efficiency function, and L (λ) is to be measured
The spectral radiance of display screen (2) is distributed, and obtains the brightness value of display screen to be measured (2)；
S3, the data source by converting 16 road optical fiber, obtain the spectroscopic data and brightness value of corresponding 16 pixels,
To obtain the luminance uniformity in corresponding region, corresponding chromatic value then is calculated according to standard colorimetric formula.
5. a kind of detection method of multichannel light spectrum image-forming display screen Systems for optical inspection according to claim (4), special
Sign is: in the step S1, the method for determining camera lens equivalent optical center are as follows:
A. it uses tight shot: camera (5) camera lens bottom is obtained away from outlet integrating sphere (1-2) or to be measured aobvious by rangefinder (11)
Display screen distance Ud, the position by calculating mobile platform is obtained as plane separation camera lens distance from bottom Vd, bring equation intoIn formula, f is tight shot focal length, can solve equivalent optical center and camera lens distance from bottom δ, object
Away from U=Ud- δ, image distance V=Vd-δ；
B. it uses zoom lens: to any focal length f, camera (5) camera lens bottom being obtained away from integrating sphere (1-2) by rangefinder (11)
Or display screen to be measured exports distance Ud1And Ud2, the position by calculating mobile platform is obtained as plane separation camera lens distance from bottom Vd1
And Vd2, bring above-mentioned two groups of numerical value into equation group:
Wherein, δ is the position at current lens equivalent optical center, and f is current focus.
6. a kind of detection method of multichannel light spectrum image-forming display screen Systems for optical inspection according to claim 4, feature
Be: in the step S3, chromatic value includes: chromaticity coordinates, purity, correlated colour temperature, colour rendering index and colour gamut.
7. a kind of detection method of multichannel light spectrum image-forming display screen Systems for optical inspection according to claim 4, feature
Be: the τ need not be tested in practical applications, and the τ during Testing And Regulating is mutually about removed.
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