Brightness distribution measurement device and method

Abstract

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 of view diaphragm and an optical receiver arranged in sequence; the sample to be tested and the field of view diaphragm are in an optical conjugate relationship; the field of view 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 of view diaphragm is the optical axis of the brightness measurement device. The problem that the test area of ​​the sample to be tested changes too much due to the change of the observation angle is solved, the measurement error is reduced, and the measurement accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of photoelectric testing, and in particular to a brightness distribution measuring device and method. Background Art

[0002] At present, the viewing angle characteristics of semi-finished devices such as Panel or OLED are generally tested by using a point-of-sight spectral luminance meter or a point-of-sight luminance meter, which is equipped with a turntable to achieve the viewing angle-brightness / chromaticity characteristics in a certain direction (one-dimensional) or full space (two-dimensional). According to the imaging principle of the point-of-sight luminance meter, the size of the test spot is constantly changing at different viewing angles. The spot is the smallest when the vertical test is performed, and the spot becomes elliptical and larger as the viewing angle increases. Generally speaking, the point-of-sight luminance meter averages the brightness of the luminous surface in the test area. For displays, 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 OLED, some samples are fully luminous, and this sample test will have the same problem as the display, while some samples are partially luminous. For partially luminous samples, the impact of changes in the size of the test area on the test results should be considered more. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a brightness distribution measurement device and method, aiming to solve the technical problem in the prior art that when performing brightness distribution testing, the sample brightness distribution test results are affected by changes in the test observation angle, resulting in test errors.

[0004] On the one hand, the present invention discloses a brightness distribution measuring device, comprising 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 relative to each other to achieve brightness distribution measurement; the brightness measuring device comprises a first lens unit, a field of view diaphragm and an optical receiver arranged in sequence; the sample to be measured and the field of view diaphragm are in an optical conjugate relationship; the field of view diaphragm rotates synchronously with the change of the observation angle of the brightness measuring device, wherein the observation angle is the angle between the measurement direction of the brightness measuring device and the normal line of the center of the measurement surface of the sample to be measured, and the rotation axis of the field of view diaphragm is the optical axis of the brightness measuring device.

[0005] In the brightness distribution measuring device of the present invention, the field diaphragm of the brightness measuring device rotates with the observation angle. The field diaphragm is circular, and during the rotation process, the equivalent field diaphragm will become elliptical, and as the angle increases, the short axis of the ellipse will become shorter, and the measurement field of the brightness measuring device will change accordingly (becoming smaller and smaller). When the brightness measuring device is rotating to test the viewing angle characteristics of the sample to be tested, it will stretch the test area in the rotation direction. If the test area is circular, it will become an ellipse as the viewing angle increases. If the test area is an ellipse and has a short axis in the stretching direction, it will become a circular test area after being stretched. Therefore, the circular field diaphragm in the brightness measuring device rotates synchronously with the brightness meter test viewing angle. If the rotation direction is consistent with the angle, it can ensure that the spot size of the measured surface remains unchanged and is the size of the initial circular area. In this way, the present application can solve the problem of excessive changes in the test area of ​​the sample to be tested due to changes in the observation angle, reduce measurement errors, and improve measurement accuracy.

[0006] It should be noted that the rotating device can control the sample to be tested to rotate, or can control the brightness measuring device to rotate, or can control the sample to be tested and the brightness device to rotate at the same time, and this application does not impose any restrictions.

[0007] In some optional embodiments, the observation angle is the same as the relative rotation angle of the field aperture. The relative rotation angle of the field aperture is consistent with the observation angle, which can ensure that the spot size of the measurement surface remains unchanged, thereby achieving the purpose of reducing measurement errors.

[0008] In some optional embodiments, the field aperture and the measuring direction change in the same direction. The change in the same direction in the above embodiments mainly refers to keeping the rotation direction synchronous to achieve the technical effect of the present application.

[0009] In some optional 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 those skilled in the art can make adjustments based on common knowledge.

[0010] In some optional embodiments, the optical receiver is an optical fiber. The optical receiver is but not limited to an optical fiber, which is not limited here.

[0011] In the above optional embodiment, one or more optical detectors are included, and the light beam of the sample to be measured is coupled to the receiving surface of one or more optical detectors through the optical fiber.

[0012] In the above optional embodiment, a second lens unit is further included, and the second lens unit is arranged 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.

[0013] In the above optional embodiments, the one or more optical detectors include a brightness detector and / or a spectral radiation detector. By setting optical fibers, usually one-to-many optical fibers are used, each corresponding to an optical detector, the function of simultaneously collecting the brightness or spectral information of the sample to be tested is realized.

[0014] On the other hand, the present invention further discloses a brightness distribution measurement method, comprising the brightness distribution measurement device provided by any of the above optional embodiments, wherein the measurement steps include:

[0015] S1, calibrating the brightness of the brightness distribution measuring device using a standard lamp;

[0016] S2, measuring using the calibrated brightness distribution measuring device.

[0017] Since rotating the field diaphragm of the brightness measurement device will cause the test observation angle to change, it is necessary to calibrate at each observation angle during brightness calibration. The test result of rotating the field diaphragm by one angle requires the corresponding calibration state to obtain the correct result.

[0018] In some optional embodiments, step S1 includes calibrating the brightness distribution measurement device at one or more observation angles, wherein the observation angle is the angle between the measurement direction and the normal of the measurement surface of the sample to be measured, and the calibration distance of the one or more observation angles remains unchanged.

[0019] In some optional embodiments, step S1 includes calibrating the brightness distribution measurement device at an observation angle, calculating calibration data of one or more observation angles according to a cosine relationship, and performing brightness calibration, wherein the observation angle is the angle between the measurement direction and the normal of the measurement surface of the sample to be measured, and wherein the calibration distance of the one or more observation angles remains unchanged.

[0020] Generally speaking, the calibration distance refers to the distance between the receiving surface of the brightness measurement device and the center of the measuring surface of the sample to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 A schematic diagram of the structure of a brightness distribution measurement device provided by an embodiment of the present invention;

[0022] Attached Figure 2 A schematic diagram of the structure of another brightness distribution measurement device provided by an embodiment of the present invention;

[0023] Attached Figure 3 for Figure 2 A schematic diagram of a measurement area change of a brightness measurement device provided in an embodiment;

[0024] Attached Figure 4A schematic diagram of the structure of another brightness distribution measurement device provided by an embodiment of the present invention;

[0025] Attached Figure 5 A schematic diagram of a brightness measurement device provided by an embodiment of the present invention;

[0026] Attached Figure 6 A flow chart of a brightness distribution measurement method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] This embodiment discloses a brightness distribution measurement device, such as Figure 1 As shown, it includes a sample to be tested 1, a rotating device 5 and a brightness measuring device 20, wherein the sample to be tested 1 is arranged on the rotating device 5, and the rotating device 5 controls the sample to be tested 1 and the brightness measuring device 20 to rotate relative to each other to achieve brightness distribution measurement; the brightness measuring device 20 includes a first lens unit 2, a field of view diaphragm 3 and an optical receiver 4 which are arranged in sequence; the sample to be tested 1 and the field of view diaphragm 3 are in an optical conjugate relationship; the field of view diaphragm 3 rotates synchronously with the change of the observation angle α of the brightness measuring device 20, wherein the observation angle α is the angle between the measurement direction of the brightness measuring device 20 and the normal line of the center of the measurement surface of the sample to be tested 1, and the rotation axis of the field of view diaphragm 3 is the optical axis of the brightness measuring device 20.

[0028] This embodiment discloses a brightness distribution measurement device, such as Figure 1 and Figure 2 As shown, it includes a sample to be tested 1, a rotating device 5 and a brightness measuring device 20, wherein the sample to be tested 1 is arranged on the rotating device 5, and the rotating device 5 controls the sample to be tested 1 and the brightness measuring device 20 to rotate relative to each other to achieve brightness distribution measurement; the brightness measuring device 20 includes a first lens unit 2, a field stop 3 and an optical receiver 4 arranged in sequence; the sample to be tested 1 and the field stop 3 are in an optical conjugate relationship. The rotating device 5 controls the sample to be tested 1 and the brightness measuring device 20 to rotate relative to each other; the brightness measuring device 20 rotates to the measurement direction of the observation angle α, that is, the position shown by the brightness measuring device 20'; the field stop 3 also rotates relative to the brightness measuring device while the brightness measuring device rotates, that is, it rotates relative to the field stop 3' by an angle α to the field stop 3A'.

[0029] like Figure 2 and Figure 3 As shown, the test area 8 of the brightness measurement device 20 can completely cover the sample 1 to be measured. When the brightness measurement device 20 is rotated to the measurement direction of the observation angle α, if the field diaphragm does not rotate relatively, that is, the field diaphragm 3', the test area 8' of the brightness measurement device 20' becomes an ellipse as the observation angle increases. In the embodiment of the present application, the field diaphragm 3A' is relatively rotated so that the test area 8A' does not change with the rotation of the brightness measurement device 20', thereby obtaining a more accurate measurement result.

[0030] This embodiment discloses a brightness distribution measurement device, such as Figure 4 As shown, it includes a sample to be tested 1, a rotating device 5 and a brightness measuring device 20, wherein the sample to be tested 1 and the brightness measuring device 20 are respectively arranged on both sides of the rotating device 5, and the rotating device 5 controls the sample to be tested 1 and the brightness measuring device 20 to rotate relative to each other to achieve brightness distribution measurement; it also includes a guide rail 51, which is used to change the distance between the sample to be tested 1 and the brightness measuring device 20 to adapt to the testing requirements of samples to be tested of different sizes; it can be realized that the brightness measuring device 20 includes a first lens unit 2, a field of view diaphragm 3 and an optical receiver 4 which are arranged in sequence; the sample to be tested 1 and the field of view diaphragm 3 are in an optical conjugate relationship; the field of view diaphragm 3 rotates synchronously with the change of the observation angle α of the brightness measuring device 20, wherein the observation angle α is the angle between the measuring direction of the brightness measuring device 20 and the normal of the center of the measuring surface of the sample to be tested 1, and the rotation axis of the field of view diaphragm 3 is the optical axis of the brightness measuring device 20.

[0031] This embodiment discloses a brightness distribution measurement device, such as Figure 5 As shown, it includes a sample to be tested 1, a rotating device 5 and a brightness measuring device 20. The rotating device 5 controls the relative rotation of the sample to be tested 1 and the brightness measuring device 20 to achieve brightness distribution measurement. The brightness measuring device 20 includes a first lens unit 2, a field of view diaphragm 3 and an optical receiver 4 arranged in sequence. The sample to be tested 1 and the field of view diaphragm 3 are in an optical conjugate relationship. The field of view diaphragm 3 rotates synchronously with the change of the observation angle α of the brightness measuring device 20, wherein the observation angle α is the angle between the measurement direction of the brightness measuring device 20 and the normal of the center of the measurement surface of the sample to be tested 1, and the rotation axis of the field of view 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 also includes more than one optical receiver and a second lens unit 7. The light beam of the sample to be tested 1 is emitted through the optical receiver 4 and coupled to the receiving surface of the optical detector through the second lens unit 7. The optical detectors are a brightness detector 60 and a spectral radiation detector 61, respectively.

[0032] This embodiment discloses a brightness distribution measurement method. Figure 6 As shown, including the brightness distribution measurement device provided by any embodiment, the measuring steps include:

[0033] S1, calibrating the brightness of the brightness distribution measuring device;

[0034] S2, measure using a calibrated brightness distribution measuring device.

[0035] This embodiment discloses a brightness distribution measurement method, including the brightness distribution measurement device provided by any embodiment, and the measurement steps include:

[0036] S1, calibrating the brightness of the brightness distribution measuring device;

[0037] S2, measure using a calibrated brightness distribution measuring device.

[0038] Wherein, step S1 includes calibrating the brightness distribution measurement device at one or more observation angles, wherein the observation angle is the angle between the measurement direction and the normal of the measurement surface of the sample to be measured, and the calibration distance of one or more observation angles remains unchanged.

[0039] This embodiment discloses a brightness distribution measurement method, including the brightness distribution measurement device provided by any embodiment, and the measurement steps include:

[0040] S1, calibrating the brightness of the brightness distribution measuring device;

[0041] S2, measure using a calibrated brightness distribution measuring device.

[0042] Among them, step S1 includes, performing brightness calibration on the brightness distribution measurement device at an observation angle, calculating calibration data of one or more observation angles according to a cosine relationship, wherein the observation angle is the angle between the measurement direction and the normal of the measurement surface of the sample to be measured, and the calibration distance of one or more observation angles remains unchanged.

[0043] The specific embodiments of the present invention are described above in conjunction with the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are only for illustration and not for limiting the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The protection scope of the present invention is defined by the appended claims.

Claims

1. A brightness distribution measuring device, characterized in that: include A sample to be tested, a rotating device and a brightness measuring device, wherein the rotating device controls the sample to be tested and the brightness measuring device to rotate relative to each other to achieve brightness distribution measurement; The brightness measuring device comprises a first lens unit, a field stop and an optical receiver which are arranged in sequence; The sample to be tested and the field aperture are in an optical conjugate relationship; The field of view aperture rotates synchronously with the observation angle of the brightness measuring device, wherein the observation angle is the angle between the measurement direction of the brightness measuring device and the center normal of the measurement surface of the sample to be measured, and the rotation axis of the field of view aperture is the optical axis of the brightness measuring device.

2. A brightness distribution measuring device according to claim 1, characterized in that: The observation angle is the same as the relative rotation angle of the field stop.

3. A brightness distribution measuring device according to claim 2, characterized in that: The rotation direction of the field aperture is consistent with that of the measuring direction.

4. A brightness distribution measuring device according to claim 1, characterized in that: The optical receiver is a photomultiplier tube, a CMOS photodiode or a CCD.

5. The brightness distribution measuring device according to claim 1, characterized in that: The optical receiver is an optical fiber.

6. A brightness distribution measuring device according to claim 5, characterized in that: The method comprises one or more optical detectors, wherein the light beam of the sample to be tested is coupled to the receiving surface of one or more optical detectors through the optical fiber; and further comprises a second lens unit, wherein the second lens unit is arranged between the optical receiver and the optical detector, and the light beam of the sample to be tested is coupled to the receiving surface of the optical detector through the second lens unit.

7. A brightness distribution measuring device according to claim 6, characterized in that: The one or more optical detectors include a brightness detector and / or a spectral radiation detector.

8. A brightness distribution measurement method, characterized in that: The device for measuring brightness distribution according to any one of claims 1 to 5 comprises the following steps: S1, performing brightness calibration on the brightness distribution measuring device; S2, measuring using the calibrated brightness distribution measuring device.

9. The brightness distribution measurement method according to claim 8, characterized in that: The step S1 includes calibrating the brightness distribution measurement device at one or more observation angles, wherein the observation angle is the angle between the measurement direction and the normal of the measurement surface of the sample to be measured, and the calibration distance of the one or more observation angles remains unchanged.

10. The brightness distribution measurement method according to claim 9, characterized in that: The step S1 includes performing brightness calibration on the brightness distribution measuring device at an observation angle, and calculating calibration data of one or more observation angles according to a cosine relationship, wherein the observation angle is the angle between the measurement direction and the normal of the measurement surface of the sample to be measured, and the calibration distance of the one or more observation angles remains unchanged.

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