An imaging colorimeter for four color matrix color correction

Abstract

The application belongs to the field of colorimeters, and particularly relates to an imaging colorimeter for four-color matrix color correction, which comprises a rotary filter disc, an imaging sensor, a lens, a driving structure assembly and a circuit control module. The rotary filter disc comprises a fixed plate, a color filter wheel and an ND filter wheel which are respectively arranged on the front and back sides of the fixed plate and are parallel to the fixed plate and rotationally connected with the fixed plate. The color filter wheel and the ND filter wheel are both multi-hole rotating wheels. The circuit control module can control the rotation of the two multi-hole rotating wheels in the rotary filter disc through the driving structure assembly, so that different color filters and ND filters with different light transmittances are combined to filter and transmit the light collected by the lens. In addition, the circuit control module can also control the imaging parameters of the imaging sensor, so that the imaging sensor cooperates with the rotary filter disc to ensure the single-channel resolution while obtaining images of different wavelength segments, and accurate measurement of the multispectral images for color and brightness measurement is realized.

Description

Technical Field

[0001] This invention belongs to the field of colorimeters, and more specifically, relates to an imaging colorimeter for four-color matrix color correction. Background Technology

[0002] Organic light-emitting diode (OLED) displays and other novel display devices are widely used in various electronic products such as mobile phones, home televisions, and personal computers. Color and brightness uniformity are crucial quality control indicators for the color accuracy of these products. However, color mura (a phenomenon where uneven brightness causes various marks) can occur on displays of different sizes, especially small screens. Traditional imaging solutions often struggle to detect mura due to limitations in detection accuracy, leading to poor user experience after product deployment and impacting production and sales.

[0003] Traditional industrial inspection, to meet efficiency requirements, often uses grayscale cameras for inspection, while color and brightness performance indicators need to be measured separately. However, Mura defects typically exhibit multicolor characteristics, with varying degrees of prominence across different spectra, making them difficult to detect using grayscale imaging in traditional inspection systems. Traditional brightness measurement schemes utilize physical modeling, such as using an integrating sphere to create an imaging luminance meter, but these methods can only measure brightness and are inefficient in both space and time. Therefore, measuring the luminous performance of new display devices has become a challenging problem.

[0004] Imaging colorimeters are gradually becoming a new direction in the development of automated optical inspection (AOI). By using imaging methods to detect colorimetry and brightness, the key is to establish the conversion relationship between grayscale and physical quantities, calibrate the colorimeter's conversion matrix, and thus calculate the true colorimetry and brightness information. Imaging colorimeters are a crucial new type of AOI equipment for simultaneously detecting Mura defects in novel display devices and measuring luminous performance. However, most domestically produced imaging colorimeters currently have shortcomings, primarily in their need to improve the accuracy of multispectral measurements. For example, the commonly used imaging colorimeter CXS-1200 provides high-pixel brightness, colorimetry, and uniformity measurements, capable of pixel-level measurements of images within seconds, suitable for various applications such as backlight measurement and display optical testing. However, this measurement method is not without its flaws. First, the colorimeter decomposes the reflected light of the color sample through red, green, and blue filters, which is then received by the sensor and converted into colorimetric values. Even when the sample is illuminated by a standard light source, and the sensor's spectral sensitivity is converted using a color filter to match the visual sensitivity of a standard observer, errors may still exist in the colorimeter's readings, even with proper instrument calibration. This is because the degree of spectral matching between the color filter and the sensor cannot achieve a strictly linear relationship with the human eye's sensitivity to color perception, resulting in low accuracy in color measurement. Measurements under these circumstances may not accurately reflect actual color differences, and this deficiency may be more pronounced, especially in applications requiring high-precision measurements.

[0005] Based on this, the present invention designs an imaging colorimeter based on four-color matrix color correction to solve the above problems. Summary of the Invention

[0006] In view of the shortcomings of existing technologies and the need for improvement, this invention provides an imaging colorimeter for four-color matrix color correction, which aims to solve the problem of low multispectral measurement accuracy of existing imaging colorimeters.

[0007] To achieve the above objectives, according to one aspect of the present invention, an imaging colorimeter for four-color matrix color correction is provided, comprising: a rotating filter disc 1, an imaging sensor 2, a lens 3, a drive structure assembly 4, and a circuit control module 5; wherein,

[0008] The rotary filter disc 1 includes a fixed plate 11 and a color filter wheel 12 and an ND filter wheel 13 located on the front and rear sides of the fixed plate 11, parallel to the fixed plate 11 and rotatably connected; the imaging sensor 2 is located on the side of the ND filter wheel 13 away from the color filter wheel 12 and is electrically connected to the circuit control module 5; the lens 3 is located on the side of the rotary filter disc 1 away from the imaging sensor 2 and is positioned directly opposite the imaging sensor 2.

[0009] Both the color filter wheel 12 and the ND filter wheel 13 are multi-hole rotating wheels. Each rotating wheel has five identical through holes evenly arranged along the circumference. Three of the through holes on the color filter wheel 12 are X filter, Y filter, and Z filter, respectively, and the other two through holes are black holes and empty holes, respectively. One of the through holes on the ND filter wheel 13 is an empty hole, and the other through holes are ND filters with different light transmittance. The fixing plate 11 is provided with a circular hole facing the lens 3 to ensure that the optical center of the lens, the center of the filter, and the center of the imaging sensor are on the same straight line. The lens 3 is used to acquire the image of the screen to be tested and transmit it to the imaging sensor 2 through the straight line. The image sensor 2 is used to acquire spectral images under the control of the imaging parameters of the circuit control module 5. The circuit control module 5 is also used to control the rotation of each multi-hole rotating wheel through the drive structure component 4.

[0010] Furthermore, it also includes a housing 6, with a rotary filter disc 2, an imaging sensor 3, a drive structure assembly 4, and a circuit control module 5 disposed inside the housing 6; and a lens 4 disposed outside the housing 6 and facing the imaging sensor 3 through a light-transmitting hole on the housing 6.

[0011] Furthermore, lens 3 is disposed outside the light-transmitting hole via a lens adapter ring;

[0012] The imaging colorimeter also includes a position correction component 7 for correcting the alignment of the lens position with the light aperture.

[0013] Furthermore, the outer casing 6 is provided with a heat dissipation vent, and a cooling fan is provided inside the heat dissipation vent on the side corresponding to the imaging sensor. Dustproof cotton is also provided on the outer casing at the position corresponding to the heat dissipation vent.

[0014] Furthermore, the ND filter wheel 13 has four ND filters, and the transmittance of the four ND filters is set to 0.1%, 10%, 20% and 40% respectively.

[0015] Furthermore, the drive structure assembly 4 includes a central pulley 41 fixed at the center of each perforated wheel, a drive pulley 42 connected to the outside of each central pulley 41 via a transmission belt and rotatably connected to the fixed plate 11, and a motor 43 electrically connected to each drive pulley 42; wherein, the drive pulley and motor corresponding to the color filter wheel 12 and the drive pulley and motor corresponding to the ND filter wheel 13 are located at different positions on the fixed plate, and each motor is electrically connected to the circuit control module 5.

[0016] Furthermore, the imaging sensor 2 is an area array CCD sensor camera.

[0017] This invention also provides a novel method for detecting surface defects in display devices, comprising:

[0018] Using the imaging colorimeter described above, multispectral images of the surface of the novel display device under test are acquired and used as test samples;

[0019] Based on the test samples, a four-color matrix color correction algorithm and a machine vision defect detection algorithm are used to detect surface defects.

[0020] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects:

[0021] (1) This invention proposes an imaging colorimeter structure, including a rotating filter disc, an imaging sensor, a lens, a drive structure assembly, and a circuit control module. The rotating filter disc includes a fixed plate and color filter wheels and ND filter wheels located on the front and rear sides of the fixed plate, parallel to the fixed plate and rotatably connected. Both the color filter wheels and ND filter wheels are multi-hole rotating wheels. The circuit control module can control the rotation of the two multi-hole rotating wheels in the rotating filter disc through the drive structure assembly, so that different color filters and ND filters with different transmittance can be combined to filter and transmit light collected by the lens. In addition, the circuit control module can also control the imaging parameters of the imaging sensor, so that the imaging sensor, in conjunction with the rotating filter, can obtain images of different wavelength bands while ensuring single-channel resolution, thereby achieving accurate measurement of multispectral images used for colorimetry and brightness measurement. Therefore, this invention uses the drive structure assembly and multi-hole rotating wheels to switch the positions of various filters and other structures on the color filter wheels and ND filter wheels, so that the XYZ filters can be switched efficiently in conjunction with the imaging system, providing convenience for the four-color matrix color correction algorithm.

[0022] (2) This invention also proposes a drive structure assembly, which includes a central pulley fixed at the center of each porous rotating wheel, a drive pulley connected to the outside of each central pulley via a transmission belt and rotatably connected to a fixed plate, and a motor electrically connected to each drive pulley; wherein the drive pulley and motor corresponding to the color filter wheel and the drive pulley and motor corresponding to the ND filter wheel are located at different positions on the fixed plate, and each motor is electrically connected to the circuit control module. This structural design facilitates control while making the drive more precise and flexible. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an imaging colorimeter structure for four-color matrix color correction provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the back of an imaging colorimeter provided in an embodiment of the present invention;

[0025] Figure 3 This is a front view of an imaging colorimeter provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram showing the position of the lens adapter ring provided in an embodiment of the present invention;

[0027] Figure 5 Provided for embodiments of the present invention Figure 1 A schematic diagram showing the comparison of colorimetric coordinate measurement results between the colorimeter and the CA-410.

[0028] Figure 6 Provided for embodiments of the present invention Figure 1 The diagram shows a comparison of the luminance measurement results of the colorimeter and the CA-410. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] An imaging colorimeter for four-color matrix color correction, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes: a rotary filter disc 1, an imaging sensor 2, a lens 3, a drive structure assembly 4, and a circuit control module 5; wherein,

[0032] The rotary filter disc 1 includes a fixed plate 11 and a color filter wheel 12 and an ND filter wheel 13 located on the front and rear sides of the fixed plate 11, parallel to the fixed plate 11 and rotatably connected to it; the imaging sensor 2 is located on the side of the ND filter wheel 13 away from the color filter wheel 12 and is electrically connected to the circuit control module 5. The imaging sensor can be fixed inside the housing by locking screws; the lens 3 is located on the side of the rotary filter disc 1 away from the imaging sensor 2 and is positioned directly opposite the imaging sensor 2.

[0033] Both the color filter wheel 12 and the ND filter wheel 13 are multi-hole rotating wheels. Each rotating wheel has five identical through holes evenly arranged along the circumference. Three of the through holes on the color filter wheel 12 are for X, Y, and Z filters, respectively, while the other two through holes are for black holes and empty holes, respectively. The black holes act as lens caps, and the empty holes are to allow light to pass through without filters. One of the through holes on the ND filter wheel 13 is an empty hole, and the other through holes are for ND filters with different transmittance. The fixing plate 11 has a circular hole facing the lens 3 to ensure that the optical center of the lens, the center of the filter, and the center of the imaging sensor are on the same straight line. The lens 3 is used to acquire the image of the screen under test and transmit it to the imaging sensor 2 through the straight line. The image sensor 2 is used to acquire spectral images under the control of the imaging parameters of the circuit control module 5. The circuit control module 5 is also used to control the rotation of each multi-hole rotating wheel through the drive structure component 4.

[0034] To ensure the accuracy of the acquired images, in this embodiment, the multispectral images used for colorimetry and luminance measurements are acquired using three different color filters (XYZ filters). The imaging sensor, in conjunction with a rotating filter wheel, allows for the acquisition of images across different wavelength bands while maintaining single-channel resolution.

[0035] The four-color matrix color correction algorithm requires precise coordination between the XYZ tristimulus filters and the camera's exposure time. Therefore, the two sets of filter wheels can be independently controlled through the control system, enabling efficient acquisition of multiple images under different spectra in actual measurements. The circuit control module controls imaging parameters such as shutter speed, exposure time, and gain through the external interface of the imaging sensor.

[0036] The circuit control module of the filter wheel can be triggered by the physical button on the back of the colorimeter, and can also be electronically controlled by software.

[0037] This embodiment proposes an imaging colorimeter based on four-color matrix color correction in the field of colorimeter technology. It includes a rotating filter disc, a forming sensor, and a circuit control module. The rotating filter disc includes a color filter wheel and an ND filter wheel. Through mechanisms and imaging, it accurately and efficiently measures the colorimetric and luminance information of novel display devices. Simultaneously, while measuring luminous performance, it can collect samples for defect detection, enabling the detection of surface defects.

[0038] As a preferred embodiment, it also includes a housing 6, with the rotary filter disc 2, the imaging sensor 3, the drive structure assembly 4, and the circuit control module 5 disposed inside the housing 6; the lens 4 is disposed outside the housing 6 and faces the imaging sensor 3 through a light-transmitting hole on the housing 6.

[0039] The most important parameter for the housing encapsulation is ensuring the accuracy of the camera flange distance. In this embodiment, the flange distance used is the standard F-mount flange distance, 46.50 mm. To ensure that the colorimeter can adapt to various working environments, a metal protective shell is added to the drive structure assembly, and the drive structure assembly and the imaging sensor are integrally sealed. Sealing rings are added to the interfaces of each component, and the overall system can achieve an IP65 protection rating.

[0040] This can be used as a preferred implementation method, such as Figure 4 As shown, lens 3 is mounted outside the light-transmitting hole via a lens adapter ring;

[0041] The imaging colorimeter also includes a position correction component 7 for correcting the alignment of the lens position with the light aperture.

[0042] In a preferred embodiment, the housing is provided with a heat dissipation vent, and a cooling fan is located inside the vent on the side corresponding to the imaging sensor. Dustproof cotton is also provided on the housing at the location corresponding to the heat dissipation vent. The heat dissipation vent and cooling fan dissipate heat from the internal structure of the housing.

[0043] As a preferred embodiment, the ND filter wheel 13 has four ND filters, and the transmittance of the four ND filters is set to 0.1%, 10%, 20% and 40% respectively.

[0044] In a preferred embodiment, the drive structure assembly 4 includes a central pulley 41 fixed at the center of each perforated wheel, a drive pulley 42 connected to the outside of each central pulley 41 via a transmission belt and rotatably connected to the fixed plate 11, and a motor 43 electrically connected to each drive pulley 42. The drive pulleys and motors corresponding to the color filter wheel 12 and the ND filter wheel 13 are located at different positions on the fixed plate, and each motor is electrically connected to the circuit control module 5. For example, the drive pulley and motor of the color filter wheel are located on the upper left side of the fixed plate, and the drive pulley and motor of the ND filter wheel are located on the upper right side of the fixed plate, thus offsetting the motor positions of the two perforated wheels.

[0045] The motor is controlled by the circuit control module, and the corresponding perforated rollers are rotated by the drive pulley, the central pulley and the transmission belt, thereby switching the position of each filter and other structure on the color filter roller and the ND filter roller.

[0046] As a preferred embodiment, the imaging sensor is an area-array CCD sensor camera to ensure accurate acquisition of surface texture details of the novel display device, while also accurately obtaining its grayscale information. For example, a 29-megapixel resolution area-array CCD sensor camera, the SVS hr29050, is selected. The high-resolution area-array CCD sensor can more accurately reproduce details, and its high dynamic range provides high-quality imaging for low-contrast textures, especially Mura defects.

[0047] Alternatively, as a preferred embodiment, the top of the housing is fixed with a handle and the bottom is provided with a threaded hole to accommodate different installation environments.

[0048] This embodiment proposes an imaging colorimeter for four-color matrix color correction, used to achieve imaging measurement of the luminous colorimetry of novel OLED display devices. The designed imaging colorimeter, through improvements to a grayscale industrial camera, is designed to acquire multispectral images via imaging. The imaging colorimeter features two rotating wheel systems, equipped with color (XYZ stimulus values) filters and a neutral density (ND) filter.

[0049] The four-color matrix color correction algorithm acquires 12 sets of images of the four colors RGBW under different exposure times through XYZ filters and apertures. Each set of images shows a good linear relationship, which can be approximately considered to be linear with the stimulus value. In conjunction with a standard colorimeter CA410 (as a reference device), the algorithm acquires the true color and brightness information of RGBW. Color correction is performed by establishing a four-point correction matrix between the calibration device and the reference device. Brightness correction is performed by calibrating the amplification ratio of the Y stimulus value.

[0050] Finally, the colorimeter measures the colorimetry and brightness of an OLED screen to be tested, and simultaneously acquires multiple sets of multispectral images as training or test images for surface defect detection.

[0051] Example 2

[0052] A novel method for detecting surface defects in display devices, comprising:

[0053] Using the imaging colorimeter described above, multispectral images of the surface of the novel display device under test are acquired and used as test samples;

[0054] Based on the test samples, a four-color matrix color correction algorithm and a machine vision defect detection algorithm are used to detect surface defects.

[0055] This embodiment studies an imaging colorimeter used for four-color matrix color correction. Colorimetric and luminance measurements were performed on 35 OLED displays under different display conditions to verify the measurement accuracy of the colorimeter. In the experiment, 10 colors were randomly selected from the displays and their luminous performance was measured sequentially. The measurement data used in this experiment are the average values ​​of the measurement results from the colorimeter of this invention and the reference device CA-410 for each specific color display state on the 35 displays.

[0056] In this experiment, the final result of the chromaticity measurement is represented by chromaticity coordinates (x, y), and the result of the luminance measurement is represented by the Y stimulus value. The unit of luminance is cd / m². 2 For the accuracy of color coordinates, the absolute error from the true value is used; the result of luminance measurement is expressed using the relative error from the true value, as follows:

[0057]

[0058] In this study, the subscript 't' represents the measurement result of the self-developed imaging colorimeter, and the subscript 'r' represents the measurement result of the reference device CA-410. Generally, in this experiment, the colorimetric measurement error is evaluated using absolute error, and the luminance measurement error is evaluated using relative error.

[0059] This experiment used the CA-410, a commercial product from Konica Minolta of Japan, as the standard equipment. The results measured by the colorimeter of this invention were compared with those measured by the CA-410. First, one OLED display with normal color rendering was selected from 35 test displays as a calibration sample, and a calibration matrix was obtained using a four-color matrix calibration algorithm. During the test, 10 sets of colors were set for each OLED display, and measurements were taken using both the colorimeter of this invention and the CA-410. The results from the CA-410 were then compared as the true values.

[0060] An experimental setup was constructed for colorimetry and luminance measurements, and external light interference was eliminated using a light-blocking cloth. The imaging module and filter control module of the imaging colorimeter were both computer-controlled, and the OLED display used in the experiment was controlled by a screen dosing device. The colorimeter imaging module could accurately control the exposure time between 10 and 20000 ms. The filters were rapidly switched between X, Y, and Z filters via a computer-controlled program. The screen dosing device allowed for adjustable intensity values ​​from 0 to 255 in all three channels.

[0061] Table 1. Colorimetric and luminance measurement results of the colorimeter and CA-410 of this invention (bold indicates the maximum error among all measurement results).

[0062]

[0063] The colorimetric and luminance detection results of the colorimeter of this invention are as follows: Figure 5 and Figure 6 As shown in Table 1, the specific test results are as follows. The measured values ​​for each color group are the average values ​​of 35 displays at that color point. It can be seen that the color coordinate measurement results of the colorimeter of this invention are very close to those of the CA-410. In 10 randomly selected color groups, the maximum measurement error of color coordinate x is 0.0042, the maximum measurement error of color coordinate y is 0.0047, and the accuracy of color coordinate (x,y) reaches ±0.005. The brightness measurement results of the colorimeter of this invention are also consistent with those of the CA-410. In ten random screen lighting settings, the maximum measurement error of brightness is 6.8%, and the measurement accuracy of brightness Y is within 7%. Imaging methods produce a large relative error in low-brightness measurements, especially for brightness levels below 100 cd / m². 2 For the above light sources, the measurement accuracy can reach within 5%.

[0064] The imaging colorimeter based on four-color matrix color correction used in this experiment achieves a color coordinate (x,y) measurement accuracy of ±0.005 and a luminance Y measurement accuracy of 7%. It can accurately measure the luminous performance of OLED display devices and realize the precise measurement of color and luminance in the display quality of OLED screens.

[0065] Therefore, this invention can accurately calibrate the camera, accurately and efficiently measure the chromaticity and brightness information of novel display devices, and at the same time, collect samples for defect detection while completing the luminous performance measurement, for the detection of surface defects.

[0066] The relevant technical solutions are the same as in Embodiment 1, and will not be repeated here.

[0067] In summary, this invention addresses the requirements of measuring luminescence performance and detecting Mura defects, achieving the following two major technical effects: (1) The XYZ filter can be used in conjunction with the imaging system for efficient switching, providing convenience for the four-color matrix color correction algorithm; (2) The use of a CCD sensor as the imaging sensor provides samples for defect detection through high-resolution imaging.

[0068] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel method for detecting surface defects in display devices, characterized in that, include: An imaging colorimeter was used to acquire multispectral images of the surface of the novel display device under test, which were then used as test samples. Based on the test samples, a four-color matrix color correction algorithm and a machine vision defect detection algorithm are used to detect surface defects. The imaging colorimeter is an imaging colorimeter used for four-color matrix color correction, comprising: a rotating filter disc (1), an imaging sensor (2), a lens (3), a drive structure assembly (4), and a circuit control module (5). The rotary filter disc (1) includes a fixed plate (11) and a color filter wheel (12) and an ND filter wheel (13) located on the front and rear sides of the fixed plate (11) and parallel to and rotatably connected to the fixed plate (11); the imaging sensor (2) is located on the side of the ND filter wheel (13) away from the color filter wheel (12) and is electrically connected to the circuit control module (5); the lens (3) is located on the side of the rotary filter disc (1) away from the imaging sensor (2) and is directly facing the imaging sensor (2); the imaging sensor (2) is an area array CCD sensor camera; Both the color filter wheel (12) and the ND filter wheel (13) are multi-hole rotating wheels. Each wheel has five identical through holes evenly distributed along its circumference. Three of the through holes on the color filter wheel (12) are X filter, Y filter, and Z filter, respectively, and the other two through holes are a black hole and an empty hole, respectively. One of the through holes on the ND filter wheel (13) is an empty hole, and the other through holes are ND filters with different transmittances. The ND filter wheel (13) has four ND filters, and the transmittance of the four ND filters is set to 0.1 in sequence. %, 10%, 20% and 40%; a circular hole is provided on the fixed plate (11) facing the lens (3) to realize that the optical center of the lens, the center of the filter and the center of the imaging sensor are on the same straight line; the lens (3) is used to acquire the screen image to be tested and transmit it to the imaging sensor (2) through the straight line; the image sensor (2) is used to acquire the spectral image under the control of the imaging parameters of the circuit control module (5); the circuit control module (5) is also used to control the rotation of each multi-hole wheel through the drive structure component (4); The drive structure assembly (4) includes a central pulley (41) fixed at the center of each perforated wheel, a drive pulley (42) connected to the outside of each central pulley (41) via a transmission belt and rotatably connected to the fixed plate (11), and a motor (43) electrically connected to each drive pulley (42); wherein the drive pulley and motor corresponding to the color filter wheel (12) and the drive pulley and motor corresponding to the ND filter wheel (13) are located at different positions on the fixed plate, and each motor is electrically connected to the circuit control module (5); The four-color matrix color correction algorithm is as follows: by acquiring 12 sets of images of the four colors RGBW displayed by the novel display device under test at different exposure times under X, Y, and Z filters and apertures, a four-color correction matrix is ​​established between the imaging colorimeter and a reference device, and color correction is performed.

2. The novel method for detecting surface defects in a display device according to claim 1, characterized in that, It also includes a housing (6), a rotating filter disc (2), an imaging sensor (3), a drive structure assembly (4), and a circuit control module (5) located inside the housing (6); and a lens (4) located outside the housing (6) and facing the imaging sensor (3) through a light-transmitting hole on the housing (6).

3. The novel method for detecting surface defects in a display device according to claim 2, characterized in that, The lens (3) is mounted outside the light-transmitting hole via a lens adapter ring; The imaging colorimeter also includes a position correction component (7) for correcting the alignment of the lens position with the light aperture.

4. The novel method for detecting surface defects in a display device according to claim 2, characterized in that, The outer casing (6) is provided with a heat dissipation vent, and a heat dissipation fan is provided inside the heat dissipation vent at the position corresponding to the imaging sensor side, and a dustproof cotton is provided on the outer casing at the position corresponding to the heat dissipation vent.

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