CN112014069A - Imaging measuring device - Google Patents
Imaging measuring device Download PDFInfo
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- CN112014069A CN112014069A CN201910450888.1A CN201910450888A CN112014069A CN 112014069 A CN112014069 A CN 112014069A CN 201910450888 A CN201910450888 A CN 201910450888A CN 112014069 A CN112014069 A CN 112014069A
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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
- G01M11/02—Testing optical properties
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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
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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Abstract
The invention discloses an imaging measuring device, which comprises an imaging receiving device, wherein the imaging receiving device comprises an area array detector; the device comprises a measuring light path, wherein a first lens is arranged in the measuring light path; emergent light of the object to be measured enters the imaging receiving device after passing through the first lens; the first reflector is arranged between the first lens and the imaging receiving device and can be cut into or cut out from a measuring light path; the calibration light path is provided with a light source and a second lens; the emergent light of the light source enters the imaging receiving device after passing through the second lens and the first reflector cut into the measuring light path. The device system is innovatively designed by integrating the measuring light path and the calibrating light path, can automatically realize the calibration of the flat field uniformity and the calibration of the color and the brightness, and greatly improves the accuracy of the uniformity of the brightness and the chromaticity of the display.
Description
Technical Field
The invention relates to the technical field of optical radiation measurement, in particular to an imaging measurement device for display measurement.
Background
As display screen technology has developed, the measurement and analysis of brightness, chromaticity, and uniformity of the display screen has become increasingly important. Compared with the limitation that the aiming point colorimeter can only measure single-point optical parameters of the display screen, the imaging colorimeter can quickly analyze the brightness and the chromaticity uniformity of the whole display screen and can be integrated into a production line for quick measurement, so that the method has more advantages and gradually becomes a mainstream choice. When the imaging colorimeter is calibrated, a broadband spectrum light source such as a halogen tungsten lamp is often used; in actual measurement, the backlight light source used by the display screen is a narrow-band spectrum light source, such as an LED. It is not easy to find that the spectrum of the calibration light source and the spectrum of the measurement light source have large difference, which causes the measurement error of the imaging colorimeter and reduces the measurement precision; in addition, in the conventional calibration, a set of calibration system is usually adopted to calibrate the device, and then the device is used for testing.
Disclosure of Invention
In order to solve the technical problems, the invention provides an imaging measurement device with a self-calibration function, through special calibration and measurement light path design, not only can the optical characteristics of brightness, chromaticity, uniformity, spectrum and the like of a display screen be accurately measured, but also equipment can be accurately calibrated, and the accuracy and long-term stability of optical measurement of a display are greatly improved.
The invention discloses an imaging measuring device, which comprises an imaging receiving device, wherein the imaging receiving device comprises an area array detector; the device comprises a measuring light path, wherein a first lens is arranged in the measuring light path; emergent light of the object to be measured enters the imaging receiving device after passing through the first lens; the first reflector is arranged between the first lens and the imaging receiving device and can be cut into or cut out from a measuring light path; the calibration light path is provided with a light source and a second lens; the emergent light of the light source enters the imaging receiving device after passing through the second lens and the first reflector cut into the measuring light path.
The invention integrates the design of a measuring light path and a calibrating light path in the light path design, a first lens is arranged in the measuring light path, a measured object is imaged to an imaging receiving device after passing through the first lens, and the imaging receiving device receives the image to realize the measurement of the brightness, the chromaticity and the uniformity of a measuring surface. In addition, a first reflecting mirror which can be switched in and out from the measuring device to realize the switching of the calibration optical path and the measuring optical path is arranged between the first lens and the imaging receiving device. Disposing a light source and a second lens in the calibration light path; the light source is imaged to the imaging receiving device through the second lens and the first reflector cut into the measuring light path, and the emergent light beam of the light source is received by the imaging receiving device so as to realize the calibration of brightness, chromaticity and uniformity.
As a technical scheme, the device also comprises a light splitting device and a spectrum measuring device; the emergent light of the measured object or the light source is formed into two beams by the light splitting device, wherein one beam is received by the imaging receiving device, and the other beam is received by the spectral measuring device.
In the measuring light path, the light beam of the measured object forms two beams of light after passing through the light splitting device, wherein one beam of light is received by the imaging receiving device to realize the measurement of the brightness, the chromaticity and the uniformity of the measuring surface, and the other beam of light is received by the spectrum measuring device to realize the spectrum measurement. In the calibration light path, the light source is imaged to the light splitting device through the second lens and the first reflector cut into the measurement light path, an emergent light beam of the light source forms two light beams after passing through the light splitting device, one light beam is received by the imaging receiving device so as to realize calibration of brightness, chromaticity and uniformity, and the other light beam is received by the spectral measurement device so as to realize spectral measurement.
As an embodiment of the above scheme, the light source of the device of the present invention is a uniform surface light source with known spectral characteristics or a uniform surface light source with adjustable spectrum; preferably, the light source in the scheme of the invention is a uniform surface light source with adjustable spectrum; the spectrum adjustment of the surface light source is used for matching the spectrum of the tested object, so that accurate calibration is realized according to the light emitting characteristics of different tested objects, and the calibration error caused by the difference between the calibration light source and the tested light source is eliminated; the design of the uniform area light source is used for realizing uniformity calibration.
As the embodiment of the scheme, the device also comprises a light source control unit for realizing the adjustment of the luminous intensity and/or the spectrum of the light source. The light source control unit in the scheme mainly adjusts the electrical parameters (such as current or voltage) of the light source, so as to adjust the luminous intensity or spectrum of the light source, substantially match the luminous spectrum of the actual measured object, realize accurate calibration and calibration, and have great significance for improving the optical parameters (including brightness, chromaticity, uniformity and the like) of the measured object.
As an embodiment of the above scheme, the system further comprises a spectral measurement analysis device; after the light source control unit adjusts the spectrum of the light source, the emission spectrum of the light source is measured through a spectrum measurement and analysis device and is compared with the spectrum of the measured object; further, the comparison result is fed back to the light source control unit again; the emission spectrum of the light source is further adjusted until the spectrum of the light source is adjusted to match the spectrum of the object under test.
In the actual measurement and calibration, the specific procedures include the following:
firstly, measuring the spectrum of a measured object; the object to be measured is imaged to the light splitting device through the measuring light path, and a beam of light formed by the light splitting device is received by the spectrum measuring device, so that the spectrum information of the display screen to be measured is obtained.
Secondly, the measured spectrum information of the object to be measured is further transmitted to a light source control unit of the light source, the current or the voltage of the light source is adjusted through the light source control unit, and finally the spectrum of the light source is adjusted to be consistent with the emission spectrum of the object to be measured.
Then, the first reflector is cut into the measuring light path, and then the light source is imaged to the light splitting device after passing through the second lens and the first reflector, one beam of light split by the light splitting device is received by the imaging receiving device and is calibrated in brightness, chromaticity and uniformity, and the other beam of light is received by the spectrum measuring device and is calibrated in spectrum.
Finally, the first reflector is cut out from the measuring light path, and the brightness, the chromaticity and the uniformity of the measured object can be measured.
As a technical scheme, the imaging receiving device is a two-dimensional area array CCD; the two-dimensional CCD can acquire the brightness distribution and the color distribution of the surface of the measured object, and has the characteristics of rapidness and convenience.
As a technical scheme, the light source comprises one or more than one LED light source and frosted glass. The LED light source irradiates the ground glass to form a uniform luminous surface; the LED light source in the scheme comprises an LED white light source and/or an LED monochromatic light source;
as a technical scheme, the light source comprises one or more LED light sources and an integrating sphere provided with a light outlet. Wherein the LED light source irradiates to the light outlet to form a uniform light emitting surface; the light source in the scheme is an integrating sphere light source, and one or more LED light sources are arranged on the wall of the integrating sphere and irradiate the light outlet of the integrating sphere, so that a uniform light emitting surface is formed.
Preferably, the number of the LED light sources is two or more, and the LED light sources are distributed annularly.
As a technical scheme, all light sources are Kohler illumination light sources; the design of the Kohler illumination light source fully ensures the uniformity of emergent light; as an implementation manner of the scheme, the light source includes one or more LED light sources, a sixth lens, an aperture stop, and a seventh lens, where the aperture stop is disposed close to the sixth lens, the LED light source is imaged to the first lens after passing through the sixth lens and the aperture stop, and further, the aperture stop is imaged to the light-emitting position by the seventh lens to form a uniform light-emitting surface, that is, a uniform surface light source is formed.
As a technical scheme, a second reflecting mirror for turning the light path is arranged in the light path of the light splitting device and the imaging receiving device; the design of the second reflector in the scheme is used for the optical path turning of the second light beam formed by the light splitting device, and the scheme can realize the miniaturization design of the equipment.
As a technical scheme, one or more than one color filter is arranged in an optical path between a measured object or a light source and an imaging receiving device. The imaging receiving device is mainly used for measuring or calibrating brightness, chroma and uniformity; the design of arranging one or more color filters in front of the imaging receiving device in the scheme is to directly obtain the brightness and color information of the light beam.
Preferably, the color filters include three color filters matching the CIE tri-stimulus curve; by the arrangement, not only the color information of the measured object can be measured, but also the brightness information of the measured object can be obtained.
As a technical scheme, the color filter device also comprises a rotating color wheel for installing and switching the color filter; in the scheme, the color filter is arranged on the rotating color wheel, and the color filter is switched on the light path through the rotation of the rotating color wheel
As a technical scheme, a third lens is further arranged between the light source and the second lens, and emergent light of the light source is imaged to the light splitting device after passing through the third lens, the second lens and the first reflector. The third lens can further improve the light efficiency of the light path calibration.
As a technical scheme, a fourth lens is further arranged between the light splitting device and the spectrum measuring device, and a beam of light formed by the light splitting device is coupled to the input end of the spectrum measuring device through the fourth lens.
As a technical scheme, a fifth lens is arranged between the second reflecting mirror and the imaging receiving device, and the light splitting device images on a light receiving surface of the imaging receiving device after passing through the fifth lens.
As a technical scheme, the light splitting device is a reflecting mirror with holes or a light splitting mirror partially transmitting and partially reflecting; in the scheme, the first emergent light beam transmitted by the spectroscope reflected by the perforated reflector or the partial transmission part passes through the third lens and is received by the spectrum measuring device, and the second emergent light beam reflected by the spectroscope reflected by the perforated reflector or the partial transmission part passes through the fourth lens and is received by the imaging receiving device.
As a technical solution, the color wheel further comprises a mechanical driving device, and the mechanical driving device is used for driving the switching of the first reflecting mirror and the rotation of the rotating color wheel.
As a technical scheme, the input end of the spectrum measuring device is an entrance slit or an optical fiber input end.
The scheme of the invention innovatively integrates and designs the measuring light path and the calibrating light path, can automatically realize the calibration of the flat field uniformity and the calibration of the color and the brightness, and greatly improves the accuracy of the instrument for testing the uniformity of the brightness and the chromaticity of the display. In addition, the system can rapidly analyze the brightness and chromaticity uniformity of the whole display screen by single measurement, and is more suitable for the measurement of a display; the system can perform spectrum fitting, and the display screen group for testing the approximate spectrum has high testing speed and high precision, so that the system is very suitable for quick testing, screening and correcting of a production line.
Drawings
FIG. 1 is a schematic view of a measuring optical path in embodiments 1, 2 and 3;
FIG. 2 is a schematic diagram of the calibration optical path in embodiments 1 and 3;
FIG. 3 is a schematic view of a uniform light source in examples 1 and 4;
FIG. 4 is a schematic view of a rotating color wheel according to embodiments 1-4;
FIG. 5 is a schematic diagram of a calibration optical path in embodiment 2;
FIG. 6 is a schematic view of a uniform light source in example 2;
FIG. 7 is a schematic view of a uniform light source in example 3;
FIG. 8 is a schematic view of a measuring optical path in example 4;
FIG. 9 is a schematic diagram of a calibration optical path in embodiment 4;
1-a first lens; 2-a light splitting device; 3-a first mirror; 4-a light source; 4-1-LED light source; 4-2-ground glass; 4-3-integrating sphere; 4-3-1-light outlet; 5-a second lens; 6-an imaging reception device; 7-a spectral measuring device; 8-a second mirror; 9-a color filter; 10-rotating the color wheel; 11-a third lens; 12-a fourth lens; 13-a fifth lens; 14-a sixth lens; 15-a seventh lens; 16-aperture diaphragm;
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the following examples.
Example one
As shown in fig. 1, 2, 3, and 4, the present embodiment discloses an imaging measurement apparatus, which is sequentially provided with a first lens 1 and a light splitting device 2 along a measurement light path direction, wherein an object to be measured is imaged to the light splitting device 2 after passing through the first lens 1, where the light splitting device 2 is a mirror with a hole; in addition, a first reflecting mirror 3 which can be cut in and cut out from the measuring light path is arranged between the first lens 1 and the light splitting device 2; the device is also provided with a calibration light path, and a light source 4 and a second lens 5 are arranged in the calibration light path; when the first reflector 3 is switched into the measuring light path, the device is switched to the calibration mode, and at the moment, the light source 4 forms an image to the light splitting device 2 through the second lens 5 and the first reflector 3; when the measurement mode needs to be switched, only the first reflector 3 needs to be cut out of the measurement light path; a light beam incident to the light splitting device 2 from a measured object or a light source is split into two beams of light after passing through the light splitting device 2, wherein a transmitted light beam passing through a middle small hole of the light splitting device 2 is received by the spectrum measuring device 7 after passing through the fourth lens 12; a second reflecting mirror 8, a fifth lens 13, a color filter 9 and an imaging receiving device 6 are sequentially arranged in a reflection light path reflected by the light splitting device 2, and a reflected light beam of the light splitting device 2 passes through the second reflecting mirror 8, then passes through the fifth lens 13 and the color filter 9, and then is received and measured by the imaging receiving device 6; in the device, a color filter 9 consists of three color filters matched with CIE tristimulus value curves X, Y and Z, and the three color filters are arranged on a rotating color wheel 10 to be rotationally switched, so that different color filters are switched into a light path; the imaging receiving device 6 in the device is a two-dimensional area array CCD; the device also comprises a light source control unit for adjusting the intensity and the spectrum of the light source 4, and the spectrum adjustment of the light source can be realized by adjusting the current or the voltage of the light source 4 through the light source control unit so as to be matched with the spectrum of the measured object; the light source 4 in the device is formed by irradiating six LED light sources 4-1 which are annularly arranged on ground glass 4-2, wherein the six LED light sources 4-1 comprise a white light LED light source and five single-color LED light sources.
In the actual measurement, the device can firstly measure the spectrum of the measured object, then the spectrum of the measured object is matched by adjusting the spectrum of the light source, and the calibration of the brightness, the chromaticity and the uniformity under the spectrum is realized; then, the calibrated equipment is adopted to measure and analyze the brightness, the chromaticity and the uniformity of the measured object; the device can complete the self-calibration function and has important significance for improving the measurement precision.
Example 2
As shown in fig. 1, 4, 5, and 6, the present embodiment discloses an imaging measurement apparatus, which has two main differences compared to embodiment 1: firstly, a third lens 11 is arranged between the light source 4 and the second lens 5 in the calibration light path, and emergent light of the light source 4 is incident to the second lens 5 after passing through the third lens 11; further, the image is imaged to the light splitting device 2 after passing through the first reflecting mirror 3; here, the third lens 11 can improve the light efficiency of the calibration light path;
secondly, the light source 4 has different implementation schemes, in the embodiment, the light source 4 consists of six LED light sources 4-1 and an integrating sphere 4-3 provided with a light outlet 4-3-1 on the sphere wall, wherein the LED light source 4-1 is arranged inside the integrating sphere 4-3, and the emitted light of the LED light source 4-1 irradiates to the light outlet to form a uniform light emitting surface;
the rest of the setup was the same as in example 1.
Example 3
As shown in fig. 1, 2, 4, and 7, the present embodiment discloses an imaging measurement apparatus, and the only difference between the present embodiment and embodiment 1 is the implementation scheme of the light source 4: the light source 4 in this embodiment is composed of an array composed of ten LED light sources 4-1, a sixth lens 14, an aperture diaphragm 16, and a seventh lens 15, wherein the aperture diaphragm 16 is disposed closely to the sixth lens 14, the emergent light of the LED light source 4-1 passes through the sixth lens 14 and the aperture diaphragm 16 and then forms an image at the seventh lens 15, and further, the aperture diaphragm 16 is formed into an even light-emitting surface at the light-emitting opening by the seventh lens 15.
Example 4
As shown in fig. 3, 4, 8 and 9, the present embodiment discloses an imaging measurement apparatus, which is different from embodiment 1 in that the optical splitting apparatus 2 is a partially transmissive and partially reflective beam splitter, wherein a light beam transmitted by the optical splitting apparatus 2 is received by the spectrum measurement apparatus 7 after passing through the fourth lens 12; the light beam reflected by the light splitting device 2 is received by the image receiving device 6 after passing through the second reflecting mirror 8, the fifth lens 13, and the color filter 9 in this order.
While the invention has been described in connection with specific embodiments thereof, it will be understood by those skilled in the art that the foregoing examples, given for purposes of illustration and not limitation, are intended to provide a limitation on the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of protection of the application is defined by the appended claims.
Claims (11)
1. An imaging measurement apparatus, comprising
An imaging receiving device (6), wherein the imaging receiving device (6) comprises an area array detector;
a measurement light path in which a first lens (1) is arranged; emergent light of the measured object enters the imaging receiving device (6) after passing through the first lens (1);
the first reflector (3), the said first reflector (3) locates between said first lens (1) and said image receiving arrangement (6), can cut into or cut out from measuring the light path;
a calibration light path in which a light source (4) and a second lens (5) are arranged; and emergent light of the light source (4) is incident to an imaging receiving device (6) after passing through the second lens (5) and the first reflector (3) cut into the measuring light path.
2. The imaging measuring device of claim 1, further comprising a spectroscopic device (2) and a spectral measuring device (7); the emergent light of the measured object or the light source (4) forms two beams of light by the light splitting device (2), wherein one beam of light is received by the imaging receiving device (6), and the other beam of light is received by the spectrum measuring device (7).
3. The imaging measuring device according to claim 1, characterized in that the light source (4) is a spectrally tunable uniform area light source.
4. Imaging measuring device according to claim 1, 2 or 3, characterized in that the light source (4) comprises one or more LED light sources (4-1) and a frosted glass (4-2).
5. Imaging measuring device according to claim 1, 2 or 3, characterized in that the light source (4) comprises one or more LED light sources (4-1) and an integrating sphere (4-3) with a light exit (4-3-1) in the sphere wall.
6. The imaging measuring device according to claim 2, characterized in that a second mirror (8) for the optical path diversion is provided between the spectroscopic device (2) and the imaging receiving device (6).
7. The imaging measuring device according to claim 2, further comprising one or more color filters (9), wherein light emitted from the object or the light source (4) is incident on the imaging receiving device (6) through the color filters (9).
8. Imaging measuring device according to claim 7, further comprising a rotating color wheel (10) for the mounting and switching of the color filter (9).
9. The imaging measurement device according to claim 2, wherein a third lens (11) is further disposed between the light source (4) and the second lens (5), and emergent light of the light source (4) sequentially passes through the third lens (11), the second lens (5) and the first reflector (3) and then is imaged to the light splitting device (2).
10. The imaging measuring device according to claim 2, characterized in that a fourth lens (12) is further arranged between the beam splitting device (2) and the spectral measuring device (7), and a beam of light formed by the beam splitting device (2) is coupled to the input of the spectral measuring device (7) via the fourth lens (12).
11. An imaging measuring device according to claim 2, characterized in that the beam splitting means (2) is a holed mirror or a partially transmissive partially reflective beam splitter.
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