CN112240886A - Display screen detection device and method - Google Patents

Display screen detection device and method Download PDF

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Publication number
CN112240886A
CN112240886A CN202011270166.7A CN202011270166A CN112240886A CN 112240886 A CN112240886 A CN 112240886A CN 202011270166 A CN202011270166 A CN 202011270166A CN 112240886 A CN112240886 A CN 112240886A
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display screen
processing unit
unit
lens module
ccd processing
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Inventor
胡运龙
姜英杰
陆鑫
刘英奇
姚军
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Kunshan Junwo Photoelectric Co ltd
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Kunshan Junwo Photoelectric Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N2021/0106—General arrangement of respective parts
    • G01N2021/0112—Apparatus in one mechanical, optical or electronic block

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Abstract

The invention discloses a display screen detection device and method, and relates to the technical field of display screen detection. The display screen detection device comprises a lens combination unit, a CCD processing unit and a filtering unit. The lens combination unit comprises a basic lens module and a close-up lens module, and the basic lens module can be used independently or combined with the close-up lens module; the CCD processing unit and the lens combination unit are arranged oppositely and can move relative to the lens combination unit so as to adapt to the measurement of different magnification factors; the filtering unit comprises three groups of different optical filters, and each group of optical filters can be coaxial with the lens combination unit and the CCD processing unit in sequence for measurement. The display screen measuring device provided by the invention can measure the brightness and the defects of the micro state of the display screen, and can complete the conventional detection of a large-size flat display screen, thereby greatly improving the application range of the measuring device, ensuring that the measuring device has better universality and low cost.

Description

Display screen detection device and method
Technical Field
The invention relates to the technical field of display screen detection, in particular to a display screen detection device and method.
Background
With the rapid development of display technologies, OLED display screens are also gradually applied to various industries, and even micro led display screens are also in mass production, so that the detection requirements on the display screens are higher and higher, and not only the conventional overall brightness, color and the like are measured, but also the brightness, color and defects of sub-pixels are detected.
The existing detection equipment is single and expensive, and cannot achieve dual purposes, so that the defects of high equipment cost, inconvenience in measurement and the like are caused.
Disclosure of Invention
The invention aims to provide a display screen detection device and method, which can perform conventional detection and microscopic detection and are low in cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a display screen detection apparatus, comprising:
a lens combination unit including a base lens module and a close-up lens module, the base lens module being usable alone or in combination with one or more of the close-up lens modules;
the CCD processing unit is arranged opposite to the lens combination unit and can move relative to the lens combination unit so as to adapt to the measurement of different magnification factors;
and the filtering unit comprises three groups of different optical filters, and each group of optical filters can be sequentially coaxial with the lens combination unit and the CCD processing unit for measurement.
Optionally, the optical module further comprises a diaphragm, the diaphragm is arranged between the lens combination unit and the light filtering unit, and the light-passing aperture of the diaphragm is the same as the diameter of the light filter.
Optionally, the filter unit further includes a wheel support and a first driving module, the wheel support is provided with at least three mounting grooves, and three different sets of the filters are correspondingly disposed in the three mounting grooves one to one; the first driving module is connected with the rotating wheel bracket and is used for driving the rotating wheel bracket to rotate; the rotating wheel support rotates to enable the three groups of different optical filters to be coaxial with the lens combination unit and the CCD processing unit in sequence.
Optionally, four mounting grooves are arranged on the wheel support, and one of the mounting grooves is a hollow groove.
Optionally, the filtering unit further includes a first position sensor, the first position sensor is disposed on one side of the rotating wheel support, and the first position sensor can sense the mounting groove to determine whether to complete detection according to the sensing times.
Optionally, the display screen detection device further comprises a moving unit, the moving unit comprises a guide rail, a sliding block and a second driving module, the sliding block is matched with the guide rail, the CCD processing unit is arranged on the sliding block, and the second driving module is fixedly connected with the sliding block and used for driving the sliding block to move on the guide rail so as to drive the CCD processing unit to move.
Optionally, the moving unit further includes two second position sensors, and the two second position sensors are correspondingly disposed at two ends of the guide rail one to one, and are used for limiting the slider to move continuously.
Optionally, the base lens module measurable distance is greater than 100mm, and the close-up lens module measurable distance is less than 50 mm.
A display screen detection method applying the display screen detection device as described in any one of the above, comprising the steps of:
when the measurement is carried out conventionally, the basic lens module is used, the CCD processing unit moves to a first limit position, the image is clear through focusing, then the rotating wheel support rotates to the next mounting groove in sequence from the empty groove to be coaxial with the basic lens module, and the measurement is carried out;
when in microscopic measurement, the basic lens module and the close-up lens module are combined, the magnification factor is adjusted by adjusting the position of the CCD processing unit, the position of the CCD processing unit is finely adjusted until the picture is clear, and then the rotating wheel support rotates from the empty groove to the next mounting groove in sequence to be coaxial with the basic lens module for measurement.
Optionally, the brightness calibration correction can be performed during the microscopic measurement process, and the brightness calibration correction formula is as follows:
Figure BDA0002777419470000031
wherein: l ' is the post-correction luminance, L is the pre-correction luminance, k is the scaling factor, L ' is the image distance, D ' is the exit pupil diameter.
The invention has the beneficial effects that:
according to the display screen detection device provided by the invention, the lens combination unit comprises the basic lens module and the close-up lens module, the position of the CCD processing unit is adjustable, and the lens combination unit adjusts the positions between the CCD processing unit and different lens modules or lens module combinations by using different lens modules or lens module combinations, so that the CCD processing unit can carry out tristimulus value analysis on a light source to obtain a conventional measurement result or a microscopic measurement result. The display screen measuring device provided by the invention can measure the brightness and the defects of the micro state of the display screen, and can complete the conventional detection of a large-size flat display screen, thereby greatly improving the application range of the measuring device, ensuring that the measuring device has better universality and low cost.
Drawings
FIG. 1 is a schematic structural diagram of a display screen detection device according to an embodiment of the present invention during a conventional measurement;
fig. 2 is a schematic structural diagram of a display screen detection device provided by an embodiment of the invention during microscopic measurement.
In the figure:
1. a lens combination unit; 2. a CCD processing unit; 3. a diaphragm;
41. a rotating wheel bracket; 42. a first driving module; 43. a first position sensor; 51. a guide rail; 52. a slider; 53. a second driving module; 54. a second position sensor;
411. and (4) mounting the groove.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1 and 2, the present embodiment provides a display screen detection apparatus including a lens combination unit 1, a CCD processing unit 2, and a filter unit. The lens combination unit 1 comprises a basic lens module and a close-up lens module, wherein the basic lens module can be used alone or combined with the close-up lens module; the CCD processing unit 2 is arranged opposite to the lens combination unit 1 and can move relative to the lens combination unit 1 so as to adapt to the measurement of different magnification factors; the filtering unit comprises three groups of different optical filters, and each group of optical filters can be sequentially coaxial with the lens combination unit 1 and the CCD processing unit 2 for measurement.
In the display screen detection device provided by this embodiment, the lens combination unit 1 includes a basic lens module and a close-up lens module, the position of the CCD processing unit 2 is adjustable, and the lens combination unit 1 adjusts the position between the CCD processing unit 2 and different lens modules or lens module combinations by using different lens modules or lens module combinations, so that the CCD processing unit 2 can perform tristimulus value analysis on the light source to obtain a conventional measurement result or a microscopic measurement result. The display screen measuring device provided by the embodiment can measure the brightness and the defects of the micro state of the display screen, and can complete the conventional detection of a large-size flat panel display screen, thereby greatly improving the application range of the measuring device, ensuring that the universality is better and the cost is low.
Three groups of different filters are respectively matched with the spectral tristimulus values of a standard chromaticity observer, the product of the spectral transmittance of the filters and the spectral response of the CCD processing unit 2 is corrected to be consistent with the spectral tristimulus value function, and the spectral transmittance tau of each filter isx(λ)、τy(lambda) and tauz(λ) are:
Figure BDA0002777419470000061
Figure BDA0002777419470000062
Figure BDA0002777419470000063
wherein S (lambda) is the relative spectral sensitivity of the detector,
Figure BDA0002777419470000064
respectively, are tristimulus values of the standard chromaticity observer spectrum, and lambda is the wavelength.
Optionally, the display screen detection device further includes a diaphragm 3, the diaphragm 3 is disposed between the lens combination unit 1 and the filtering unit, and a light-transmitting aperture of the diaphragm 3 is the same as a diameter of the optical filter. The diaphragm 3 is used for preventing other light sources from reflecting into the CCD processing unit 2 to influence the test result.
Optionally, the distance measurable by the base lens module is greater than 100mm, and the distance measurable by the close-up lens module is less than 50 mm. In the embodiment, a plurality of close-up lens modules are arranged, and when a large-sized flat panel display screen is subjected to conventional detection, only the basic lens module is used, and the focal length of the basic lens module is between 50mm and 120 mm. The basic lens module receives a light source transmitted by the display screen to be detected, the light source enters the corresponding light filter in the light filtering unit and then is received by the CCD processing unit 2, the output end of the CCD processing unit 2 is connected with an upper computer through a port, and the upper computer analyzes images collected by the CCD processing unit 2 in real time. When the brightness and the defects of the micro state of the display screen need to be detected, the combination of the basic lens module and one or more close-up lens modules can be selected. During microscopic detection, a light source transmitted by a display screen to be detected sequentially passes through the close-up lens module, the basic lens module and the optical filter unit and is received by the CCD processing unit 2, and the CCD processing unit 2 are adjusted after the magnification factor is determined due to the fact that the image distance is changed along with the magnification factorThe distance between the lens combination units 1 makes the image distance correspond to the magnification factor, and the corresponding relation between the image distance and the magnification factor is as follows:
Figure BDA0002777419470000065
wherein β is the magnification factor, l 'is the image distance, and f' is the focal length of the lens combination unit 1.
The more telephoto lenses are selected, the smaller the object distance that can be detected. The object distance that the display screen detection device that this embodiment provided can detect is less than 50mm, can accomplish the test to different magnification under the different distance condition, can measure the minimum color to 1um luminous element of diameter to can measure 1000 at least pixel simultaneously.
Optionally, the filter unit further includes a wheel support 41 and a first driving module 42, at least three mounting grooves 411 are disposed on the wheel support 41, and three different sets of filters are disposed in the three mounting grooves 411 in a one-to-one correspondence manner. The first driving module 42 is connected to the wheel support 41 and is configured to drive the wheel support 41 to rotate. The wheel holder 41 is rotated so that three different sets of filters are coaxial with the lens combination unit 1 and the CCD processing unit 2 in sequence. Preferably, four mounting grooves 411 are formed on the wheel bracket 41, wherein one mounting groove 411 is a hollow groove. In this embodiment, the wheel support 41 is cross-shaped, the four mounting grooves 411 are respectively located at four ends of the cross-shape, three different sets of filters are sequentially placed in the mounting grooves 411, and the remaining one mounting groove 411 is an empty groove. The first driving module 42 is a motor, and a driving shaft of the motor is fixedly connected with the center of the cross-shaped rotating wheel support 41, and is used for driving the rotating wheel support 41 to rotate in a single direction to drive each optical filter to rotate. During measurement, the rotating wheel bracket 41 rotates from the empty slot to the next mounting slot 411 in sequence to be coaxial with the lens combination unit 1 and the CCD processing unit 2 for measurement; after the three sets of filters are respectively rotated to be coaxial with the lens combination unit 1 and the CCD processing unit 2, once measurement is completed when the empty groove of the rotating wheel bracket 41 is coaxial with the lens combination unit 1 and the CCD processing unit 2 again.
When the CCD processing unit 2 makes the three groups of optical filters on the rotating wheel bracket 41 coaxial with the lens combination unit 1 and the CCD processing unit 2, the image collected by the CCD processing unit 2 is sentAnd (4) carrying out photometric and defect analysis on the data to an upper computer. When the CCD processing unit 2 receives the color stimulus of the light source as
Figure BDA0002777419470000071
When the light source is used, the tristimulus values of the light source colors measured by three-time integration are X, Y, Z respectively, and specifically are as follows:
Figure BDA0002777419470000072
Figure BDA0002777419470000081
Figure BDA0002777419470000082
wherein k, cx，cy，czAre all constant, τx(λ)，τy(lambda) and tauz(λ) is the spectral transmittance of each filter, S (λ) is the relative spectral sensitivity of the detector, and λ is the wavelength.
Optionally, the filter unit further includes a first position sensor 43, the first position sensor 43 is disposed at one side of the wheel support 41, and the first position sensor 43 is capable of sensing the mounting groove 411. In this embodiment, the first position sensor 43 is a photoelectric sensor, a light slit is disposed on one side of each mounting groove 411, and the photoelectric sensor senses light transmitted through the light slit and sends a primary signal to the upper computer. Photoelectric sensor sets up in camera lens assembled element 1 and CCD processing unit 2 top, and runner support 41 rotates, and mounting groove 411 and photoelectric sensor response, photoelectric sensor send the sensor signal for the host computer, and the host computer judges whether to accomplish once measuring according to the signal number of times that receives. Of course, in other embodiments, the first position sensor 43 may also be a proximity switch.
Optionally, the display screen detecting device further includes a moving unit, the moving unit includes a guide rail 51, a slider 52 and a second driving module 53, the slider 52 is matched with the guide rail 51, the CCD processing unit 2 is disposed on the slider 52, and the second driving module 53 is fixedly connected to the slider 52, and is configured to drive the slider 52 to move on the guide rail 51 to drive the CCD processing unit 2 to move. In this embodiment, the moving unit further includes a connection plate located between the slider 52 and the CCD processing unit 2 for connecting the slider 52 and the CCD processing unit 2. Because the two ends of the guide rail 51 are provided with the baffles, the position of the connecting plate is higher than that of the baffles, and the slide block 52 and the CCD processing unit 2 are arranged in a staggered manner, so that the adjustment of the distance between the CCD processing unit 2 and the lens combination unit 1 during the conventional measurement and the microscopic measurement is met. The second driving module 53 is a motor, the motor is electrically connected with an upper computer, and the upper computer analyzes the definition of the image acquired by the CCD processing unit 2 in real time and controls the motor to drive the sliding block 52 to move, so as to realize automatic focusing of the image.
Optionally, the moving unit further includes two second position sensors 54, and the two second position sensors 54 are respectively located at both ends of the guide rail 51 for sensing the two extreme positions of the CCD processing unit 2. In this embodiment, fig. 1 shows that the CCD processing unit 2 moves to the first limit position, fig. 2 shows that the CCD processing unit 2 moves to the second limit position, and when the CCD processing unit 2 moves to the first limit position and the second limit position, the second position sensor 54 on the side of the guide rail 51 senses the slider 52 and sends a signal to the upper computer, and the upper computer determines the position of the CCD processing unit 2 according to the signal of the second position sensor 54. The second position sensor 54 is a photosensor or a proximity switch.
The embodiment also provides a display screen detection method, which applies the display screen detection device and comprises the following steps:
when performing a normal measurement, the CCD processing unit 2 moves to the first limit position using the basic lens module, and performs a measurement by focusing to a clear image, and then the wheel holder 41 rotates from the empty slot to the next mounting slot 411 coaxially with the basic lens module.
In the present embodiment, the distance between the photosensitive surface of the CCD processing unit 2 and the lens bayonet surface is the flange distance of the basic lens module. The conventional measurement is used for measuring a large-size flat display screen, and the position of the CCD processing unit 2 is fixed and is always in a first limit position. When the second position sensor 54 corresponding to the first limit position senses the CCD processing unit 2, a signal is sent to the upper computer, the upper computer controls the first driving module 42 to drive the wheel support 41 to rotate, and the three sets of optical filters are coaxial with the basic lens module and the CCD processing unit 2 in sequence. The CCD processing unit 2 sequentially sends image information of light sources passing through the three groups of optical filters to an upper computer, and the upper computer analyzes the received image information and displays a detection result.
When microscopic measurement is carried out, the basic lens module and the close-up lens module are combined, the amplification factor is adjusted by adjusting the position of the CCD processing unit 2, the position of the CCD processing unit 2 is finely adjusted until the picture is clear, and then the rotating wheel support 41 rotates from the empty slot to the next mounting slot 411 in sequence to be coaxial with the basic lens module for measurement.
In this embodiment, the magnification is 3 to 5 times, the image distance varies with the magnification, and after the magnification is determined, the position of the CCD processing unit 2 is adjusted so that the image distance corresponds to the magnification. The CCD processing unit 2 shown in fig. 2 is located at the second extreme position where the amplification factor is the maximum. After the second position sensor 54 corresponding to the second limit position senses the slider 52, a signal is sent to the upper computer, the upper computer records the position of the slider 52 as an initial position at the moment, and then the second driving module 53 is controlled to drive the slider 52 to move towards the position close to the lens combination unit 1, so that the magnification factor is reduced, and the magnification factor corresponds to the image distance. When the object distance is slightly changed in the measuring process, the position of the sliding block 52 is finely adjusted in real time until the picture is clear. When the image is adjusted to be clear, the upper computer analyzes the definition of the image acquired by the CCD processing unit 2 in real time, and controls the motor to drive the sliding block 52 to move, so that the automatic focusing of the image is realized.
Optionally, the brightness calibration correction can be performed in the microscopic measurement process, and the brightness calibration correction formula is as follows:
Figure BDA0002777419470000101
wherein: l' is the corrected luminance, L is the correctionFront luminance, k is the scaling factor, l 'is the image distance, and D' is the exit pupil diameter. In order to eliminate the measurement deviation of the CCD processing unit 2 under different image distances, the brightness can be calibrated and corrected according to a brightness calibration correction formula.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims (10)

1. A display screen detection device, comprising:
a lens combination unit (1), the lens combination unit (1) comprising a base lens module and a close-up lens module, the base lens module being usable alone or in combination with one or more of the close-up lens modules;
the CCD processing unit (2) is arranged opposite to the lens combination unit (1) and can move relative to the lens combination unit (1) so as to adapt to measurement of different magnification factors;
and the filtering unit comprises three groups of different optical filters, and each group of optical filters can be sequentially coaxial with the lens combination unit (1) and the CCD processing unit (2) for measurement.
2. The display screen detection device according to claim 1, further comprising a diaphragm (3), wherein the diaphragm (3) is disposed between the lens combination unit (1) and the filter unit, and a light transmission aperture of the diaphragm (3) is the same as a diameter of the filter.
3. The display screen detection device according to claim 1, wherein the filter unit further comprises a wheel support (41) and a first driving module (42), at least three mounting slots (411) are provided on the wheel support (41), and three different sets of filters are disposed in the three mounting slots (411) in a one-to-one correspondence; the first driving module (42) is connected with the rotating wheel bracket (41) and is used for driving the rotating wheel bracket (41) to rotate; the rotating wheel support (41) rotates, so that three groups of different optical filters are coaxial with the lens combination unit (1) and the CCD processing unit (2) in sequence.
4. The display screen detection device according to claim 3, wherein four mounting grooves (411) are arranged on the wheel support (41), and one mounting groove (411) is a blank groove.
5. The display screen detecting device according to claim 3, wherein the filter unit further comprises a first position sensor (43), the first position sensor (43) is disposed at one side of the wheel support (41), and the first position sensor (43) is capable of sensing with the mounting groove (411) to determine whether the detection is completed according to the sensing times.
6. The display screen detection device according to claim 1, further comprising a moving unit, wherein the moving unit comprises a guide rail (51), a slider (52) and a second driving module (53), the slider (52) is matched with the guide rail (51), the CCD processing unit (2) is disposed on the slider (52), and the second driving module (53) is fixedly connected with the slider (52) and is used for driving the slider (52) to move on the guide rail (51) so as to drive the CCD processing unit (2) to move.
7. The display screen detection device according to claim 6, wherein the moving unit further comprises two second position sensors (54), and the two second position sensors (54) are arranged at two ends of the guide rail (51) in a one-to-one correspondence manner, and are used for limiting the sliding block (52) to move continuously.
8. The device as claimed in any one of claims 1 to 7, wherein the base lens module is capable of measuring a distance greater than 100mm and the close-up lens module is capable of measuring a distance less than 50 mm.
9. A display screen inspection method, characterized by applying the display screen inspection apparatus according to any one of claims 1 to 8, comprising the steps of:
when in routine measurement, the basic lens module is used, the CCD processing unit (2) moves to a first limit position, the picture is clear through focusing, and then the rotating wheel bracket (41) rotates to the next mounting groove (411) from the empty groove in sequence to be coaxial with the basic lens module for measurement;
when in microscopic measurement, the basic lens module and the close-up lens module are combined, the amplification factor is adjusted by adjusting the position of the CCD processing unit (2), the position of the CCD processing unit (2) is finely adjusted until the picture is clear, and then the rotating wheel support (41) rotates from the empty groove to the next mounting groove (411) which is coaxial with the basic lens module to carry out measurement.
10. The display screen detection method of claim 9, wherein the brightness calibration correction can be performed during the microscopic measurement, and the formula of the brightness calibration correction is as follows:
Figure FDA0002777419460000031
wherein: l ' is the post-correction luminance, L is the pre-correction luminance, k is the scaling factor, L ' is the image distance, D ' is the exit pupil diameter.
CN202011270166.7A 2020-11-13 2020-11-13 Display screen detection device and method Pending CN112240886A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113641020A (en) * 2021-10-18 2021-11-12 武汉精创电子技术有限公司 Liquid crystal display panel detection method and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113641020A (en) * 2021-10-18 2021-11-12 武汉精创电子技术有限公司 Liquid crystal display panel detection method and device

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