CN112014077B - A brightness distribution measurement device and method - Google Patents
A brightness distribution measurement device and method Download PDFInfo
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- CN112014077B CN112014077B CN202011014228.8A CN202011014228A CN112014077B CN 112014077 B CN112014077 B CN 112014077B CN 202011014228 A CN202011014228 A CN 202011014228A CN 112014077 B CN112014077 B CN 112014077B
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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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- 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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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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
- G01M11/0214—Details of devices holding the object to be tested
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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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J2001/4247—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources
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- Chemical & Material Sciences (AREA)
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- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
本发明公开一种亮度分布测量装置及方法，包括待测样品，转动装置及亮度测量装置，其中，所述转动装置控制所述待测样品和所述亮度测量装置发生相对转动，实现亮度分布测量；所述亮度测量装置包括依次设置的第一透镜单元，视场光阑和光学接收器；所述待测样品与所述视场光阑为光学共轭关系；所述视场光阑随所述亮度测量装置的观测角变化同步发生转动，其中，所述观测角为所述亮度测量装置的测量方向与所述待测样品测量面中心法线的夹角，所述视场光阑的转动轴为所述亮度测量装置的光轴。解决测试待测样品由于观测角变化而测试区域变化过大的问题，降低测量误差，提升测量精度。
The present invention discloses a brightness distribution measurement device and method, comprising a sample to be tested, a rotating device and a brightness measurement device, wherein the rotating device controls the sample to be tested and the brightness measurement device to rotate relative to each other to achieve brightness distribution measurement; the brightness measurement device comprises a first lens unit, a field diaphragm and an optical receiver arranged in sequence; the sample to be tested and the field diaphragm are in an optical conjugate relationship; the field diaphragm rotates synchronously with the observation angle change of the brightness measurement device, wherein the observation angle is the angle between the measurement direction of the brightness measurement device and the normal of the center of the measurement surface of the sample to be tested, and the rotation axis of the field diaphragm is the optical axis of the brightness measurement device. The problem of excessive change in the test area of the sample to be tested due to the change in the observation angle is solved, the measurement error is reduced, and the measurement accuracy is improved.
Description
Technical Field
The invention relates to the field of photoelectric testing, in particular to a brightness distribution measuring device and method.
Background
Currently, viewing angle characteristics of semi-finished products of devices such as Panel or OLED (organic light emitting diode) are generally adopted as aiming point type spectrum luminance meters or aiming point type luminance meters, and viewing angle-luminance/chromaticity characteristics in a certain direction (one-dimensional) or in a whole space (two-dimensional) are realized by matching with a turntable. According to the imaging principle of the aiming point type brightness meter, the size of the test light spot is continuously changed under different visual angles, the light spot is minimum during vertical test, and the light spot is oval and larger along with the increase of the visual angle. In general, the aiming luminance meter averages the luminance of the light emitting surface in the test area, and for the display, since the display itself is non-uniform, the result of such a viewing angle test should be a result of the combined effect of the viewing angle and uniformity of the display, and there is a certain error with the actual viewing angle characteristics. For display devices such as OLEDs, some samples are fully luminescent, which can be problematic in the same manner as displays, while some samples are partially luminescent, which should take into account the effect of the change in the size of the test area on the test results.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a brightness distribution measuring device and a brightness distribution measuring method, which aim to solve the technical problems that when brightness distribution test is carried out in the prior art, a sample brightness distribution test result is influenced by a test observation angle to generate test errors and the like.
The invention discloses a brightness distribution measuring device which comprises a sample to be measured, a rotating device and a brightness measuring device, wherein the rotating device controls the sample to be measured and the brightness measuring device to rotate relatively to realize brightness distribution measurement, the brightness measuring device comprises a first lens unit, a field diaphragm and an optical receiver which are sequentially arranged, the sample to be measured and the field diaphragm are in an optical conjugate relation, the field diaphragm synchronously rotates along with the change of an observation angle of the brightness measuring device, the observation angle is an included angle between the measuring direction of the brightness measuring device and the normal line of the center of a measuring surface of the sample to be measured, and the rotating shaft of the field diaphragm is the optical axis of the brightness measuring device.
The application relates to a brightness distribution measuring device, wherein a field diaphragm of the brightness measuring device rotates along with an observation angle. The field diaphragm is circular, the equivalent field diaphragm becomes elliptical in the rotation process, and the shorter the minor axis of the ellipse is along with the increase of the angle, the smaller the measurement field of the brightness measuring device is changed. When the brightness measuring device rotationally tests the visual angle characteristic of the sample to be tested, the test area is elongated in the rotation direction, if the test area is circular, the test area becomes elliptical along with the increase of the visual angle, and if the test area is elliptical and is short-axis in the stretching direction, the test area becomes circular after being elongated. Therefore, the circular view field diaphragm in the brightness measuring device synchronously rotates along with the testing visual angle of the brightness meter, and the spot size of the measured surface can be ensured to be unchanged and the size of the initial circular area can be ensured if the rotation direction is consistent with the angle. Therefore, the application can solve the problem that the test area of the sample to be tested is too much in change due to the change of the observation angle, reduce the measurement error and improve the measurement precision.
It should be noted that the rotation device may control the sample to be measured to rotate, or may control the brightness measurement device to rotate, or may control the sample to be measured and the brightness device to rotate at the same time, which is not limited by the present application.
In some alternative embodiments, the observation angle is the same as the relative rotation angle of the field stop. The relative rotation angle of the field diaphragm is consistent with the observation angle, so that the size of a light spot of a measurement surface is unchanged, and the purpose of reducing measurement errors is achieved.
In some alternative embodiments, the field stop and the direction of change of the measurement direction coincide. The consistent changing direction in the above embodiments mainly means that the rotation direction is kept synchronous, so as to achieve the technical effect of the present application.
In some alternative embodiments, the optical receiver is a photomultiplier tube, a CMOS photodiode, or a CCD. It should be noted that this is only an example, and a person skilled in the art may adjust the present invention according to the common general knowledge.
In some alternative embodiments, the optical receiver is an optical fiber. The optical receiver is, but is not limited to, an optical fiber, and is not limited herein.
In the above alternative embodiments, one or more optical detectors are included, the light beam of the sample to be measured being coupled through the optical fiber to the receiving face of the one or more optical detectors.
In the above alternative embodiment, the optical device further comprises a second lens unit disposed between the optical receiver and the optical detector, and the light beam of the sample to be measured is coupled to the receiving surface of the optical detector through the second lens unit.
In the above alternative embodiments, the one or more optical detectors comprise an intensity detector and/or a spectral radiation detector. By providing optical fibers, a plurality of optical fibers are typically used, each corresponding to an optical detector. The function of collecting the brightness or spectrum information of the sample to be measured is realized.
On the other hand, the invention also discloses a brightness distribution measuring method, which comprises the brightness distribution measuring device provided by any optional embodiment, and the measuring steps comprise:
s1, performing brightness calibration on the brightness distribution measuring device by using a standard lamp;
s2, measuring by using the brightness distribution measuring device after calibration.
Because the rotation of the field diaphragm of the brightness measuring device can cause the change of the test observation angles, the calibration needs to be carried out under each observation angle when the brightness is calibrated, and the correct result can be obtained only by rotating the field diaphragm by an angle test result and corresponding calibration state.
In some optional embodiments, the step S1 includes calibrating the brightness distribution measuring device under one or more observation angles, where the observation angle is an angle between a measurement direction and a normal of a measurement surface of the sample to be measured, and the calibration distance of the one or more observation angles is unchanged.
In some alternative embodiments, the step S1 includes calibrating the brightness distribution measuring device under an observation angle, calculating calibration data of one or more observation angles according to a cosine relation, and performing brightness calibration, where the observation angle is an angle between a measurement direction and a normal of a measurement surface of the sample to be measured, and the calibration distance of the one or more observation angles is unchanged.
In general, the calibration distance refers to the distance between the receiving surface of the brightness measuring device and the center of the measuring surface of the sample to be measured.
Drawings
Fig. 1 is a schematic structural diagram of a brightness distribution measuring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another brightness distribution measuring device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the change of the measurement area of the brightness measuring device according to the embodiment of FIG. 2;
FIG. 4 is a schematic diagram of another brightness distribution measuring device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a brightness measuring device according to an embodiment of the present invention;
fig. 6 is a flowchart of a brightness distribution measuring method according to an embodiment of the present invention.
Detailed Description
The embodiment discloses a brightness distribution measuring device, as shown in fig. 1, comprising a sample 1 to be measured, a rotating device 5 and a brightness measuring device 20, wherein the sample 1 to be measured is arranged on the rotating device 5, the rotating device 5 controls the sample 1 to be measured and the brightness measuring device 20 to rotate relatively to realize brightness distribution measurement, the brightness measuring device 20 comprises a first lens unit 2, a field diaphragm 3 and an optical receiver 4 which are sequentially arranged, the sample 1 to be measured and the field diaphragm 3 are in optical conjugation relation, the field diaphragm 3 rotates synchronously along with the change of an observation angle alpha of the brightness measuring device 20, the observation angle alpha is an included angle between the measuring direction of the brightness measuring device 20 and the normal of the center of a measuring surface of the sample 1 to be measured, and the rotating shaft of the field diaphragm 3 is the optical axis of the brightness measuring device 20.
The embodiment discloses a brightness distribution measuring device, as shown in fig. 1 and 2, comprising a sample 1 to be measured, a rotating device 5 and a brightness measuring device 20, wherein the sample 1 to be measured is arranged on the rotating device 5, the rotating device 5 controls the sample 1 to be measured and the brightness measuring device 20 to rotate relatively to realize brightness distribution measurement, the brightness measuring device 20 comprises a first lens unit 2, a field diaphragm 3 and an optical receiver 4 which are sequentially arranged, and the sample 1 to be measured and the field diaphragm 3 are in optical conjugate relation. The rotating device 5 controls the sample 1 to be tested and the brightness measuring device 20 to rotate relatively, the brightness measuring device 20 rotates to the measuring direction of the observation angle alpha, namely the position shown by the brightness measuring device 20', and the view field diaphragm 3 rotates relatively at the same time of rotating the brightness measuring device, namely the view field diaphragm 3 rotates to the position of the view field diaphragm 3A' by the angle alpha.
As shown in fig. 2 and 3, the test area 8 of the brightness measuring device 20 can completely cover the sample 1 to be measured. When the rotation is performed to the measuring direction of the observation angle α, if the field stop does not rotate relatively, that is, the field stop 3', the test area 8' of the brightness measuring device 20' becomes elliptical with an increase in the observation angle. In the embodiment of the application, the field diaphragm 3A ' is relatively rotated, so that the test area 8A ' cannot be changed along with the rotation of the brightness measuring device 20', and a more accurate measurement result is obtained.
The embodiment discloses a brightness distribution measuring device, which comprises a sample 1 to be measured, a rotating device 5 and a brightness measuring device 20, wherein the sample 1 to be measured and the brightness measuring device 20 are respectively arranged at two sides of the rotating device 5, the rotating device 5 controls the sample 1 to be measured and the brightness measuring device 20 to rotate relatively to realize brightness distribution measurement, the brightness distribution measuring device further comprises a guide rail 51 for changing the distance between the sample 1 to be measured and the brightness measuring device 20 to adapt to the testing requirements of samples to be measured with different sizes, the brightness measuring device 20 comprises a first lens unit 2, a field diaphragm 3 and an optical receiver 4 which are sequentially arranged, the sample 1 to be measured and the field diaphragm 3 are in optical conjugation relation, the field diaphragm 3 synchronously rotates along with the change of an observation angle alpha of the brightness measuring device 20, wherein the observation angle alpha is an included angle between the measuring direction of the brightness measuring device 20 and the normal line of the center of a measuring surface of the sample 1 to be measured, and the rotating shaft of the field diaphragm 3 is the optical axis of the brightness measuring device 20.
The embodiment discloses a brightness distribution measuring device, as shown in fig. 5, comprising a sample 1 to be measured, a rotating device 5 and a brightness measuring device 20, wherein the rotating device 5 controls the sample 1 to be measured and the brightness measuring device 20 to rotate relatively to realize brightness distribution measurement, the brightness measuring device 20 comprises a first lens unit 2, a field diaphragm 3 and an optical receiver 4 which are sequentially arranged, the sample 1 to be measured and the field diaphragm 3 are in optical conjugate relation, the field diaphragm 3 rotates synchronously with the change of an observation angle alpha of the brightness measuring device 20, the observation angle alpha is an included angle between the measuring direction of the brightness measuring device 20 and the normal of the center of a measuring surface of the sample 1 to be measured, and the rotating shaft of the field diaphragm 3 is the optical axis of the brightness measuring device 20. The optical receiver 4 is a one-to-two optical fiber. The brightness measuring device 20 further comprises more than one optical receiver and a second lens unit 7, the light beam of the sample 1 to be measured is emitted through the optical receiver 4 and coupled to the receiving surface of the optical detector, the optical detector being a brightness detector 60 and a spectral radiation detector 61 respectively,
The embodiment discloses a brightness distribution measuring method, as shown in fig. 6, including the brightness distribution measuring device provided in any embodiment, the measuring steps include:
S1, performing brightness calibration on a brightness distribution measuring device;
S2, measuring by using the calibrated brightness distribution measuring device.
The embodiment discloses a brightness distribution measuring method, including the brightness distribution measuring device provided in any embodiment, the measuring steps include:
S1, performing brightness calibration on a brightness distribution measuring device;
S2, measuring by using the calibrated brightness distribution measuring device.
The step S1 includes calibrating the brightness distribution measuring device under one or more observation angles, where the observation angle is an included angle between a measuring direction and a normal line of a measuring surface of the sample to be measured, and a calibration distance of one or more observation angles is unchanged.
The embodiment discloses a brightness distribution measuring method, including the brightness distribution measuring device provided in any embodiment, the measuring steps include:
S1, performing brightness calibration on a brightness distribution measuring device;
S2, measuring by using the calibrated brightness distribution measuring device.
The step S1 includes performing brightness calibration on the brightness distribution measuring device under an observation angle, and calculating calibration data of one or more observation angles according to a cosine relation, wherein the observation angle is an included angle between a measuring direction and a normal of a measuring surface of a sample to be measured, and the calibration distance of one or more observation angles is unchanged.
While specific embodiments of the invention have been described above with reference to the drawings, it will be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit 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 the invention is defined by the appended claims.
Claims (10)
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| JPH07229845A (en) * | 1994-02-22 | 1995-08-29 | Nikon Corp | Dust particle inspection system |
| FR2800163B1 (en) * | 1999-10-26 | 2002-01-18 | Eldim | DEVICE FOR MEASURING THE SPATIAL DISTRIBUTION OF THE SPECTRAL EMISSION OF AN OBJECT |
| WO2018216246A1 (en) * | 2017-05-23 | 2018-11-29 | 浜松ホトニクス株式会社 | Orientation characteristic measurement method, orientation characteristic measurement program, and orientation characteristic measurement device |
| CN209432409U (en) * | 2019-03-11 | 2019-09-24 | 苏州科技大学 | A naked-eye 3D display test platform |
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