Optical sensor, color analyzer and optical correction system

Abstract

The application provides an optical sensor, a color analyzer and an optical correction system. The optical sensor comprises an optical sensing device and a light homogenizing plate. The optical sensing device comprises a telecentric lens. The optical sensing device is used for collecting light of a to-be-detected area of a display panel and converting the light into an electrical signal. The light homogenizing plate is arranged in a spaced manner with the telecentric lens and is used for shielding the telecentric lens. The light homogenizing plate is used for homogenizing at least the light of the to-be-detected area. The application homogenizes the light by using the light homogenizing plate at the front end of the optical sensing device, and the boundary light of the to-be-detected area of the display panel is blurred, so that the light flux entering the optical sensing device remains unchanged when measured at different positions, and the brightness repeatability of the measurement is improved.

Description

Technical Field

[0001] This application relates to the field of optical technology, and in particular to an optical sensor, a color analyzer, and an optical correction system. Background Technology

[0002] In close-range measurements of the luminance and color of large-pitch LED (Light Emitting Diode) screens, color analyzers suffer from poor measurement repeatability. Utility Model Content

[0003] The main technical problem addressed by this application is to provide an optical sensor, a color analyzer, and an optical correction system to solve the problem of poor repeatability in the measurement of luminance and color of large-pitch LED screens in the prior art.

[0004] To address the aforementioned technical problems, the first technical solution provided in this application is: to provide an optical sensor, comprising:

[0005] An optical sensing device, including a telecentric lens; the optical sensing device is used to collect light from the area to be detected on the display panel and convert it into an electrical signal;

[0006] A light homogenizer is placed at an interval from the telecentric lens and is used to block the telecentric lens; the light homogenizer is used to homogenize the light at least in the area to be detected.

[0007] In this case, the edge of the light-diffusing plate extends beyond the edge of the telecentric lens.

[0008] The light homogenizer and the telecentric lens are both circular and coaxially arranged; the diameter of the light homogenizer is 1.2-1.5 times the diameter of the telecentric lens.

[0009] The distance between the light-diffusing plate and the telecentric lens is 20-40 mm.

[0010] Among them, the light homogenizer is an engineering diffuser, a prism light homogenizer, a nanostructure light homogenizer, or a multi-layer composite light homogenizer.

[0011] Among them, the light-diffusing sheet is an engineering diffuser; the thickness of the engineering diffuser is 1-2 mm.

[0012] The light-diffusing sheet is an engineered diffuser; the engineered diffuser includes a substrate and multiple microlenses disposed on the substrate; the microlenses are circular lenses; the thickness of the circular lenses is 20-40 μm and the diameter is 60-120 μm.

[0013] The optical sensor also includes a light-shielding tube; the light-diffusing plate and the telecentric lens are installed inside the light-shielding tube.

[0014] The optical sensing device includes a telecentric lens, a beam-splitting assembly, and a light-receiving assembly arranged sequentially along the optical path; wherein,

[0015] The telecentric lens is an aspherical telecentric lens; the beam splitting assembly includes a bundled fiber beam splitting system; the optical receiving assembly includes multiple focusing lenses, multiple filters, and multiple photodiodes; or

[0016] The telecentric lens is a spherical telecentric lens; the beam splitting assembly includes a bundled fiber beam splitting system; the light receiving assembly includes multiple focusing lenses, multiple filters, and multiple photodiodes; and the optical sensing device further includes a light homogenizing tube disposed on the optical path from the telecentric lens to the beam splitting assembly.

[0017] The light-diffuser and telecentric lens are movable; the optical sensor also includes:

[0018] A sensing device used to measure the pixel pitch of a display panel;

[0019] The driving component is used to dynamically adjust the positional relationship between the light-diffuser and the telecentric lens according to the pixel pitch.

[0020] The driving components include:

[0021] A rotating wheel, with a light-diffusing plate mounted on it;

[0022] The drive mechanism is connected to the rotating wheel; wherein, the drive mechanism is used for,

[0023] In response to a pixel pitch greater than or equal to a threshold, the rotating wheel is rotated to cause the light-diffusing plate to block the telecentric lens;

[0024] In response to the pixel pitch being less than a threshold, the rotating wheel is rotated to move the light-diffusing plate out of the field of view of the telecentric lens.

[0025] To address the aforementioned technical problems, the second technical solution provided in this application is: to provide a color analyzer, comprising:

[0026] The optical sensor is the optical sensor described above;

[0027] A signal processor is used to receive and analyze electrical signals from an optical sensor.

[0028] To address the aforementioned technical problems, the third technical solution provided in this application is: to provide an optical correction system, comprising:

[0029] Display panel to be calibrated;

[0030] The color analyzer is the one described above.

[0031] The telecentric lens faces the display surface of the display panel, and a light-diffusing sheet is placed between the telecentric lens and the display surface to block the telecentric lens; the optical sensor is configured to collect light emitted by the display panel under near-field conditions, and the pixel pitch of the display panel is greater than or equal to 2 mm.

[0032] The beneficial effects of this application are as follows: Unlike existing technologies, this application provides an optical sensor, a color analyzer, and an optical correction system. The optical sensor includes an optical sensing device and a light homogenizer. The optical sensing device includes a telecentric lens. The optical sensing device is used to collect light from the area to be tested on the display panel and convert it into an electrical signal. The light homogenizer is spaced apart from the telecentric lens and is used to block the telecentric lens. The light homogenizer is used to homogenize the light at least in the area to be tested. Because the number of LED points at different measurement positions varies during large-pitch LED panel testing, the luminous flux entering the optical system varies. Homogenization within the optical path can only redistribute the existing luminous flux entering the optical system; it cannot fundamentally eliminate the inconsistency of the original luminous flux. That is, it cannot change the fact that the luminous flux entering the optical system is inherently different. Therefore, homogenization within the optical path can only improve the repeatability of colorimetric measurements during large-pitch LED measurements, but cannot improve the repeatability of brightness. This application uses a light homogenizer at the very front of the optical sensing device to homogenize the light, blurring the boundary light of the area to be detected on the display panel, so that the light flux entering the optical sensing device remains constant when measuring at different positions, thereby improving the brightness repeatability of the measurement. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the first embodiment of the optical sensor provided in this application;

[0035] Figure 2 This is a schematic diagram of the structure of the second embodiment of the optical sensor provided in this application;

[0036] Figure 3 This is a schematic diagram of the light-diffusing sheet and telecentric lens provided in this application projected onto the display panel;

[0037] Figure 4 This is a measurement repeatability chart of a simulated P2 lamp board without using a light diffuser at different locations, provided in this application.

[0038] Figure 5This application provides a measurement repeatability chart of a simulated P2 light panel at different locations after using an engineered diffuser;

[0039] Figure 6 This is a schematic diagram of the structure of the third embodiment of the optical sensor provided in this application;

[0040] Figure 7 This is a schematic diagram of the structure of the fourth embodiment of the optical sensor provided in this application;

[0041] Figure 8 This is a schematic diagram of the connection structure of the sensing device, driving assembly and light homogenizer provided in this application;

[0042] Figure 9 This is a schematic diagram of the structure of an embodiment of the color analyzer provided in this application;

[0043] Figure 10 This is a schematic diagram of an embodiment of the optical correction system provided in this application.

[0044] Explanation of icon numbers:

[0045] 1. Color analyzer; 100. Optical sensor; 10. Optical sensing device; 11. Telecentric lens; 111. Aspherical telecentric lens; 112. Spherical telecentric lens; 12. Beam splitter; 121. Output channel; 13. Light receiving assembly; 131. Focusing lens; 132. Filter; 133. Photodiode; 14. Aperture; 15. Beam homogenizer; 16. Beam homogenizer assembly; 20. Beam homogenizer; 30. Light shield; 40. Sensing device; 50. Drive assembly; 51. Rotary wheel; 52. Drive mechanism; 200. Signal processor; 300. Cable; 2. Display panel; 201. Display surface; 202. LED light spot; 210. First projection pattern; 220. Second projection pattern; 3. Optical correction system. Detailed Implementation

[0046] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0047] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In related technologies, the measurement of luminance and color of large-pitch LED screens has the following drawbacks:

[0052] (1) Large pixel pitch affects accuracy: The pixel pitch of a large pixel pitch LED screen is relatively large, which may lead to a large difference in the specific brightness and color value of each pixel during measurement, thus affecting the overall measurement accuracy.

[0053] (2) Uniformity is difficult to guarantee: Due to the large pixel pitch, the luminous intensity and viewing angle of the LED are more inconsistent, making it difficult to control the brightness uniformity and the measurement results may have a large deviation.

[0054] (3) Poor measurement repeatability: The measurement of large-pitch LED screens requires more sampling points to ensure accuracy. However, due to the limitation of the measurement aperture of the color analyzer, the number of sampling points cannot be guaranteed, resulting in poor measurement repeatability.

[0055] Other near-field measuring instruments, such as the CA410, are only suitable for measuring the luminance and color of LCD (Liquid Crystal Display) or small-pitch LED screens; while far-field measuring instruments, such as the CR200, are suitable for measuring large-pitch LED screens, but require sacrificing distance for measurement repeatability.

[0056] Because the number of LEDs at different measurement positions varies during testing of large-pitch LED light boards, the luminous flux entering the optical system varies. In this case, homogenization within the optical path can only redistribute the existing luminous flux entering the optical system, but cannot fundamentally eliminate the inconsistency of the original luminous flux. That is, it cannot change the fact that the luminous flux entering the optical system is inherently different. Therefore, homogenization within the optical path can only improve the repeatability of chromaticity measurement when measuring large-pitch LEDs, but cannot improve the repeatability of luminance.

[0057] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the optical sensor provided in this application. Figure 2 This is a schematic diagram of the structure of the second embodiment of the optical sensor provided in this application. Figure 3 This is a schematic diagram of the light-diffusing sheet and telecentric lens provided in this application projected onto the display panel.

[0058] To address the aforementioned technical problems, this application provides an optical sensor 100. The optical sensor 100 includes an optical sensing device 10 and a light-diffusing plate 20. The optical sensing device 10 includes a telecentric lens 11. The optical sensing device 10 is used to collect light from a detection area of ​​the display panel 2 and convert it into an electrical signal. The light-diffusing plate 20 is spaced apart from the telecentric lens 11 and is used to block the telecentric lens 11. The light-diffusing plate 20 is used to even out the light at least in the detection area.

[0059] This application uses a light homogenizer 20 at the front end of the optical sensing device 10 to homogenize the light, blurring the boundary light of the area to be detected on the display panel 2, so that the light flux entering the optical sensing device 10 remains constant when measuring at different positions, thereby improving the brightness repeatability of the measurement.

[0060] The light homogenizer 20 is used to homogenize the light in at least the area to be detected. This can be understood as the light homogenizer 20 homogenizing the light in only the area to be detected, or the light homogenizer 20 homogenizing the light in the area to be detected and the light near the edge of the area to be detected.

[0061] In some embodiments, such as Figure 1As shown, the orthographic projection of the telecentric lens 11 onto the light-diffusing plate 20 is located within the light-diffusing plate 20, and the orthographic projection pattern of the telecentric lens 11 onto the light-diffusing plate 20 coincides with the edge of the light-diffusing plate 20. That is, the orthographic projection of the telecentric lens 11 onto the display panel 2 is set to coincide with the orthographic projection of the light-diffusing plate 20 onto the display panel 2.

[0062] In some embodiments, such as Figure 2 As shown, the edge of the light-diffusing plate 20 extends beyond the edge of the telecentric lens 11.

[0063] Specifically, the light-diffusing plate 20 is configured to block the telecentric lens 11, and the orthographic projection of the telecentric lens 11 on the light-diffusing plate 20 is located within the light-diffusing plate 20, and the orthographic projection pattern of the telecentric lens 11 on the light-diffusing plate 20 is spaced apart from the edge of the light-diffusing plate 20.

[0064] By positioning the edge of the light homogenizer 20 beyond the edge of the telecentric lens 11, even slight positional deviations between the light homogenizer 20 and the telecentric lens 11 will not significantly affect the performance of the optical sensor 100, thereby simplifying the alignment and installation process of the optical sensor 100. Secondly, the light homogenizer 20 can uniformly homogenize the light in the area to be detected and the light in the surrounding area. That is, the light homogenizer 20 can cover the area outside the field of view of the telecentric lens 11, ensuring more uniform illumination received throughout the entire field of view of the telecentric lens 11. This makes the luminous flux in different areas to be detected more consistent, further improving brightness repeatability.

[0065] Field of view indicates the maximum range that the lens can capture.

[0066] In some embodiments, both the light-diffusing plate 20 and the telecentric lens 11 are circular and coaxially arranged. The diameter of the light-diffusing plate 20 is 1.2-1.5 times the diameter of the telecentric lens 11.

[0067] For example, the display panel 2 has multiple LED light spots 202. The projection pattern of the telecentric lens 11 on the display panel 2 is a first projection pattern 210, and the projection pattern of the light diffuser 20 on the display panel 2 is a second projection pattern 220. Both the first projection pattern 210 and the second projection pattern 220 are circular and share the same center. The first projection pattern 210 is smaller than the second projection pattern 220.

[0068] It is important to note that Figure 2 The multiple first projection graphics 210 in the image are the result of multiple projections of the same telecentric lens 11 onto the display panel 2.

[0069] The fact that both the light homogenizer 20 and the telecentric lens 11 are circular and coaxially arranged ensures that the uniform light generated by the light homogenizer 20 directly enters the effective field of view of the telecentric lens 11, without causing insufficient or excessive light in some areas due to offset. This maximizes the use of the light homogenizer 20's function and ensures that the light received by the telecentric lens 11 is evenly distributed across the entire field of view.

[0070] The diameter of the light homogenizer 20 is designed to be 1.2-1.5 times that of the telecentric lens 11, so as to reduce the size and cost of the optical sensor 100 while ensuring a certain degree of repeatability.

[0071] In other embodiments, the light-diffusing plate 20 can also be other shapes, such as regular or irregular shapes like rectangles or regular hexagons, as long as the light-diffusing plate 20 blocks the telecentric lens 11.

[0072] In some embodiments, the distance between the light-diffusing plate 20 and the telecentric lens 11 is 20-40 mm.

[0073] For example, the distance between the light-diffusing plate 20 and the telecentric lens 11 is 30 mm, so that the light-emitting surface of the light-diffusing plate 20 is within the optimal working distance range of the telecentric lens 11, and the size of the optical sensor 100 is reduced.

[0074] The working distance range of the telecentric lens 11 refers to the distance between the front end of the telecentric lens 11 (generally the front surface of the lens) and the object being imaged. The working distance is an important parameter that determines the effective range within which the lens can achieve a clear image.

[0075] The distance between the light homogenizer 20 and the telecentric lens 11 is set to ensure that the homogenized light generated by the light homogenizer 20 has enough time and space to propagate into the effective field of view of the telecentric lens 11.

[0076] In some embodiments, the light homogenizer 20 is an engineering diffuser, a prism light homogenizer, a nanostructure light homogenizer, or a multilayer composite light homogenizer.

[0077] In other embodiments, the light-diffusing sheet 20 may also be other structures with light-diffusing effects.

[0078] Please see Figures 1 to 5 , Figure 4 This application provides a measurement repeatability chart of a simulated P2 lamp board without a diffuser at different locations. Figure 5 This application provides a measurement repeatability chart of a simulated P2 light panel at different locations after using an engineered diffuser.

[0079] For example, the light diffuser 20 is an engineered diffuser.

[0080] The principle of engineered diffusers: They are designed based on the microlens principle, using etching technology to create a random microlens array structure on the substrate surface. Engineered diffusers are also called microlens homogenizers.

[0081] Compared to ordinary frosted glass diffusers, this embodiment uses an engineered diffuser as a light-diffusing sheet 20. By utilizing its specific surface texture and structure, more precise light control and uniform light distribution can be achieved. Furthermore, the transmittance of the engineered diffuser is greater than 90%, which greatly improves the light energy utilization rate.

[0082] Figure 4 and Figure 5 In P2 / 0.5mm, P2 indicates a pixel pitch of 2 mm, and 0.5mm indicates a step size of 0.5 mm for the movement of the light panel during testing. G represents green light, Lv represents luminance, and x and y represent chromaticity coordinates, also known as color coordinates.

[0083] from Figure 4 and Figure 5 The results show that after adding an engineered diffuser to the front end of the optical sensing device 10, the repeatability of brightness measurement improved from 2.105% to 0.283%, while the chromaticity repeatability remained essentially unchanged. Both brightness and chromaticity repeatability were within the required specifications. Therefore, this embodiment of the application improves the repeatability of measured brightness by setting an engineered diffuser.

[0084] The performance indicators are as follows: maximum deviation of luminance repeatability <0.5%, maximum deviation of chromaticity repeatability <0.0005.

[0085] In some embodiments, the light diffuser 20 is an engineered diffuser. The thickness of the engineered diffuser is 1-2 mm.

[0086] The engineered diffuser scatters light through its internal or surface microstructure. An engineered diffuser of appropriate thickness can ensure that light is fully scattered during propagation, thereby achieving a good homogenization effect. Secondly, while ensuring that the engineered diffuser has a certain strength, the size of the optical sensor 100 can be reduced.

[0087] In some embodiments, the light-diffusing sheet 20 is an engineered diffuser. The engineered diffuser includes a substrate and a plurality of microlenses disposed on the substrate. The microlenses are circular lenses. The thickness of the circular lenses is 20-40 μm and the diameter is 60-120 μm.

[0088] For example, the circular lens has a thickness of 30 μm and a diameter of 90 μm.

[0089] Circular lenses offer better light uniformity, and selecting appropriate microlens sizes allows for efficient control of light propagation direction at the microscopic scale.

[0090] In some embodiments, the optical sensor 100 further includes a light-shielding tube 30. The light-diffusing plate 20 and the telecentric lens 11 are mounted inside the light-shielding tube 30.

[0091] The light-shielding tube 30 is opaque and is used to block external stray light. The light-shielding tube 30 is made of metal, plastic or a material coated with a light-absorbing coating.

[0092] For example, the light-shielding tube 30 is made of matte black plastic with a frosted inner surface to avoid external light interference and internal light from forming a mirror reflection, thereby improving measurement accuracy.

[0093] The light-shielding tube 30 can also be made of other materials; there are no major restrictions here, and the choice can be made according to actual needs.

[0094] For example, the light-shielding tube 30 is cylindrical to ensure that light is not affected by shape deviation when it propagates along the axis; secondly, the cylindrical design allows the light-shielding tube 30 to be easily arranged coaxially, which facilitates the installation and alignment of optical components such as the light-diffusing plate 20 and the telecentric lens 11.

[0095] The light-shielding tube 30 can also be a hollow rectangular tubular structure. There are no major restrictions here; the choice can be made according to actual needs.

[0096] The light-diffusing plate 20 is fixedly installed inside the light-shielding tube 30, and / or the telecentric lens 11 is fixedly installed inside the light-shielding tube 30, depending on the actual needs.

[0097] For example, the telecentric lens 11 is fixedly disposed within the light-shielding tube 30, and the light-diffusing plate 20 is movably disposed relative to the telecentric lens 11. This allows the distance between the light-diffusing plate 20 and the telecentric lens 11 to be adjusted according to the application scenario, thereby improving the flexibility and versatility of the optical sensor 100. For instance, during close-range measurements, increasing the distance between the light-diffusing plate 20 and the telecentric lens 11 increases the scattering effect of the light-diffusing plate 20 to compensate for light concentration; during long-range measurements, decreasing the distance between the light-diffusing plate 20 and the telecentric lens 11 reduces the scattering effect of the light-diffusing plate 20 to ensure sufficient brightness.

[0098] For example, the telecentric lens 11 is fixedly disposed inside the light-shielding tube 30, and the light-diffusing plate 20 is detachably disposed inside the light-shielding tube 30. The detachable design of the light-diffusing plate 20 allows the user to replace the light-diffusing plate 20 with different specifications or types according to actual needs. For example, when the surface of the light-diffusing plate 20 is contaminated, it can be easily disassembled and cleaned or replaced.

[0099] In some embodiments, the optical sensing device 10 includes a telecentric lens 11, a beam splitter 12, and a light receiver 13 arranged sequentially along the optical path.

[0100] The telecentric lens 11 is used to focus the light after it has been homogenized by the light homogenizer 20 onto a focusing plane behind it, so as to ensure high-quality transmission of the light signal.

[0101] The beam splitter 12 decomposes the optical signal into different components (e.g., wavelength, polarization, or intensity) as needed. The optical receiver 13 is located behind the beam splitter 12 and is used to receive the optical signal after it has been split by the beam splitter 12 and convert it into an electrical signal.

[0102] For example, the optical sensing device 10 also includes an aperture stop 14 disposed in the optical path from the telecentric lens 11 to the beam splitter 12. The aperture stop 14 serves to limit light. The aperture stop (AS) of the aperture stop 14 blocks unwanted light to determine the light that can enter the beam splitter 12.

[0103] In one specific embodiment, such as Figure 1 As shown, the telecentric lens 11 is an aspherical telecentric lens 111. The beam splitting assembly 12 includes a bundled fiber beam splitting system. The light receiving assembly 13 includes multiple focusing lenses 131, multiple filters 132, and multiple photodiodes 133.

[0104] The bundled fiber optic splitting system consists of multiple optical fibers (not shown) used to evenly distribute the light entering the splitting component 12 to multiple output channels 121.

[0105] Specifically, the telecentric lens 11 focuses the light homogenized by the light homogenizer 20 onto a focusing plane behind it, and transmits it through the aperture 14 to the bundled fiber optic splitting system.

[0106] For example, the bundled fiber optic splitting system divides the light entering the aperture 14 into three parts, that is, distributes them to three output channels 121.

[0107] The optical signal of each output channel 121 passes sequentially through a focusing lens 131, a filter 132, and a photodiode 133. Each photodiode 133 corresponds to a filter 132 and a focusing lens 131.

[0108] Each focusing lens 131 corresponds to an output channel 121 for focusing the optical signal output from the optical fiber onto a specific area.

[0109] A filter 132 is disposed between a focusing lens 131 and a photodiode 133 to selectively transmit light signals within a specific wavelength range. The filter 132 can be an X filter, a Y filter, or a Z filter.

[0110] Each photodiode 133 corresponds to a filter 132 and a focusing lens 131, used to convert optical signals into electrical signals.

[0111] Using an aspherical telecentric lens 111 to focus and homogenize light can also reduce the number of spherical lenses used in the optical sensor 100, thereby reducing the total number of lenses in the optical sensor 100. This helps to reduce the generation and interference of stray light, as well as reduce the weight and size of the optical sensor 100.

[0112] Please see Figures 1 to 6 , Figure 6 This is a schematic diagram of the structure of the third embodiment of the optical sensor provided in this application.

[0113] In another specific embodiment, such as Figure 6 As shown, the telecentric lens 11 is a spherical telecentric lens 112. The beam splitting assembly 12 includes a bundled fiber beam splitting system. The light receiving assembly 13 includes multiple focusing lenses 131, multiple filters 132, and multiple photodiodes 133. The optical sensing device 10 also includes a light homogenizing tube 15 disposed in the optical path from the telecentric lens 11 to the beam splitting assembly 12.

[0114] Specifically, in the optical path from the telecentric lens 11 to the beam splitter 12, aperture stops 14 are provided at both ends of the light-diffusing tube 15.

[0115] The telecentric lens 11 converges the light homogenized by the light homogenizer 20 to a focusing plane behind it, and then transmits the light through the aperture 14, the light homogenizer 15 and the aperture 14 to the bundled fiber optic splitting system.

[0116] For example, the light homogenizer 15 has a cylindrical structure, which is used to homogenize the light signal output from the telecentric lens 11, reduce the non-uniformity of light intensity distribution, improve the performance of the subsequent beam splitter 12, and ensure that the light signal intensity received by each output channel 121 is consistent.

[0117] In other embodiments, the light-diffusing tube 15 may also be a conical structure, etc. There are no great restrictions here, and the choice can be made according to the actual situation.

[0118] The beam splitter 12 and the optical receiver 13 are described above and will not be repeated here.

[0119] The telecentric lens 11 uses a spherical lens, and the light homogenizing scheme uses a light homogenizing tube 15, which has a simple structure, low cost, and no loss of light energy.

[0120] Please see Figures 1 to 7 , Figure 7 This is a schematic diagram of the structure of the fourth embodiment of the optical sensor provided in this application.

[0121] In other embodiments, such as Figure 7As shown, the optical sensing device 10 includes a telecentric lens 11, a light-diffusing assembly 16, and a light-receiving assembly 13 arranged sequentially along the optical path. The optical sensing device 10 also includes an aperture stop 14 disposed along the optical path from the telecentric lens 11 to the light-diffusing assembly 16. The light-diffusing assembly 16 is used to diffuse and mix the light rays converging on the focal plane, and to uniformly project them backward onto the light-receiving assembly 13 within a preset angle range. The light-receiving assembly 13 includes a focusing lens 131, multiple filters 132, and multiple photodiodes 133.

[0122] The light projected backward by the light homogenizing component 16 is converted into parallel light by the focusing lens 131 and projected onto the filter 132, and then projected onto the photodiode 133 through the filter 132.

[0123] Each photodiode 133 has a filter 132 disposed in front of it. There are three photodiodes 133, and for example, the three filters 132 are X filter, Y filter and Z filter.

[0124] Please see Figures 1 to 8 , Figure 8 This is a schematic diagram of the connection structure of the sensing device, driving component and light homogenizer provided in this application.

[0125] In some embodiments, the light-diffuser 20 and the telecentric lens 11 are movably disposed. The optical sensor 100 also includes a sensing device 40 and a driving assembly 50; the sensing device 40 is used to measure the pixel pitch of the display surface 201 plate 2. The driving assembly 50 is used to dynamically adjust the positional relationship between the light-diffuser 20 and the telecentric lens 11 according to the pixel pitch.

[0126] The sensing device 40 calculates the center distance (i.e., pixel pitch) between adjacent pixels by capturing images of the display panel 2 or directly sensing physical parameters (such as light intensity distribution, geometric features, etc.).

[0127] The drive component 50 is used to automatically adjust the positional relationship between the light-diffuser 20 and the telecentric lens 11 according to the pixel pitch.

[0128] In some embodiments, the driving assembly 50 includes a rotating wheel 51 and a driving mechanism 52. A light-diffusing plate 20 is disposed on the rotating wheel 51. The driving mechanism 52 is connected to the rotating wheel 51; wherein the driving mechanism 52 is configured to rotate the rotating wheel 51 to block the light-diffusing plate 20 from the telecentric lens 11 in response to a pixel pitch greater than or equal to a threshold; and is also configured to rotate the rotating wheel 51 to move the light-diffusing plate 20 out of the field of view of the telecentric lens 11 in response to a pixel pitch less than the threshold.

[0129] The rotating wheel 51 is a rotatable disc-shaped structure, typically mounted on a fixed base (not shown) of the optical sensor 100 via bearings or a precision rotating mechanism. The light-diffusing plate 20 is fixed to the rotating wheel 51 by mechanical clamps or adhesive bonding to ensure its stability during rotation.

[0130] Each light homogenizer 20 has different optical parameters, such as transmittance, scattering angle, and homogenization effect. At least one light homogenizer 20 is disposed on the rotating wheel 51. When multiple light homogenizers 20 are disposed on the rotating wheel 51, the parameters of the multiple light homogenizers 20 can be different. By rotating the rotating wheel 51, the required light homogenizer 20 can be moved to the working position (i.e., blocking the telecentric lens 11) to adapt to different types of display panels 2 or measurement needs.

[0131] For example, a light-diffusing plate 20 is disposed on the rotating wheel 51.

[0132] The threshold is used to determine whether the display panel 2 is a large-pitch display or a small-pitch display, so as to adjust whether to use the light homogenizer 20 for light homogenization, thereby improving the repeatability of the measured brightness.

[0133] Large-pitch displays refer to displays with a pixel pitch greater than or equal to a threshold, such as outdoor billboards, sports venues, and building facades. Large-pitch displays are suitable for occasions requiring a certain viewing distance.

[0134] Small-pitch displays refer to displays with a pixel pitch less than a threshold, such as those used in conference rooms, studios, and educational institutions. Small-pitch displays are suitable for high-end indoor display scenarios.

[0135] In some embodiments, the threshold may be 2 mm.

[0136] In other embodiments, the threshold may be 2.5 mm.

[0137] The drive mechanism 52 includes a motor (not shown) and a control circuit (not shown).

[0138] The motor in the drive mechanism 52 can be selected from different types according to the application scenario, such as stepper motor, servo motor or DC motor.

[0139] The control circuit receives commands from the sensor 40 and controls the motor's start, stop, speed, and direction to ensure that the rotor 51 moves along a predetermined trajectory. The control circuit also monitors the motor's operating status in real time and adjusts control parameters to improve system stability and accuracy.

[0140] When the pixel pitch is greater than or equal to a threshold, the drive mechanism 52 rotates the wheel 51 to make the light equalizer 20 block the telecentric lens 11. The light equalizer 20 is used to equalize the light, blurring the boundary light of the area to be detected on the display panel 2, reducing the local brightness difference caused by the large pixel pitch, so that the light flux entering the optical sensing device 10 remains unchanged when measured at different positions, and improving the brightness repeatability of the measurement.

[0141] In response to a pixel pitch less than a threshold, the drive mechanism 52 rotates the wheel 51 to move the light homogenizer 20 out of the field of view of the telecentric lens 11. This is equivalent to not using the light homogenizer 20 and directly collecting the light emitted from the area to be detected on the display panel 2 through the telecentric lens 11. For small-pitch displays, the pixels are densely arranged and have a small pitch, resulting in a relatively uniform brightness distribution. In cases of small pixel pitch, not using the light homogenizer 20 simplifies the optical path, reduces unnecessary light energy loss, and improves the overall efficiency of the system.

[0142] Please see Figures 1 to 9 , Figure 9 This is a schematic diagram of the structure of an embodiment of the color analyzer provided in this application.

[0143] This application provides a color analyzer 1. The color analyzer 1 includes the optical sensor 100 described above and a signal processor 200. The signal processor 200 is used to receive and analyze electrical signals from the optical sensor 100.

[0144] Specifically, the optical sensor 100 is aligned with the area to be inspected on the display panel 2 to capture light from the area and convert it into an electrical signal. The signal processor 200 receives the electrical signal from the optical sensor 100 and performs calculations to measure and analyze the optical and color characteristics of the display panel 2. The optical sensor 100 is connected to the signal processor 200 via a cable 300.

[0145] Please see Figures 1 to 10 , Figure 10 This is a schematic diagram of an embodiment of the optical correction system provided in this application.

[0146] This application provides an optical correction system 3. The optical correction system 3 includes the color analyzer 1 described above and the display panel 2 to be corrected.

[0147] For example, the display panel 2 to be calibrated is a large-pitch LED screen or a large-pitch LCD screen.

[0148] Specifically, the display panel 2 to be calibrated is an LED screen with a resolution of P2 or higher, such as P2, P3, P4, P5, P6, P7, P8, P10, P16, P20, etc. The pixel pitch is represented by the P value, for example, P2 indicates a pixel pitch of 2 mm, and P6 indicates a pixel pitch of 6 mm.

[0149] The display panel 2 to be calibrated can also be a small-pitch display, such as an LCD screen or a small-pitch LED screen.

[0150] In some embodiments, the telecentric lens 11 faces the display surface 201 of the display panel 2, and a light diffuser 20 is disposed between the telecentric lens 11 and the display surface 201 to block the telecentric lens 11. The optical sensor 100 is configured to collect light emitted by the display panel 2 under near-field conditions, and the pixel pitch of the display panel 2 is greater than or equal to 2 mm.

[0151] When measuring a large-pitch LED display, the light-diffusing plate 20 blocks the telecentric lens 11, blurring the boundary of the area to be measured. This ensures that the luminous flux entering the optical sensing device 10 of the optical sensor 100 remains constant when measuring at different positions, improving the brightness repeatability of the measurement and thus addressing the problem of poor measurement repeatability in large-pitch LED screens. In other words, when the light-diffusing plate 20 blocks the telecentric lens 11, the optical correction system 3 of this application is suitable for near-field measurement of large-pitch LED displays.

[0152] Near-field conditions refer to a short distance between the measuring device and the object being measured. In this embodiment, it refers to the distance between the light-diffusing plate 20 of the optical sensor 100 and the display surface 201.

[0153] For example, the distance between the light-diffusing plate 20 of the optical sensor 100 and the display surface 201 is less than 30 cm. The distance can be selected according to actual needs, and no further restrictions are imposed here.

[0154] For example, the distance between the light-diffusing plate 20 of the optical sensor 100 and the display surface 201 is less than 30 cm and greater than 10 cm.

[0155] It should be noted that the optical correction system 3 provided in this application embodiment is not only suitable for luminance and chromaticity measurement of large-pitch displays, but also for luminance and chromaticity measurement of small-pitch LED screens or LCD screens. Under near-field measurement conditions, the use of the light-diffusing filter 20 can effectively shield the interference of ambient light on the measurement results, thereby achieving accurate measurement of each pixel under macro conditions; at the same time, it can also improve the problem of poor measurement repeatability of large-pitch displays under near-field conditions. That is, the optical correction system 3 provided in this application embodiment is compatible with luminance and chromaticity measurement of LCDs, small-pitch LED screens, and large-pitch LED screens under near-field conditions, and the measurement accuracy and repeatability are not affected.

[0156] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0157] The above are merely embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. An optical sensor, characterized in that, include: An optical sensing device, including a telecentric lens; the optical sensing device is used to collect light from the area to be detected on the display panel and convert it into an electrical signal; A light homogenizer is disposed at a distance from the telecentric lens and is used to block the telecentric lens; the light homogenizer is used to homogenize the light at least in the area to be detected.

2. The optical sensor according to claim 1, characterized in that, The edge of the light-diffusing plate extends beyond the edge of the telecentric lens.

3. The optical sensor according to claim 2, characterized in that, Both the light-diffusing plate and the telecentric lens are circular and coaxially arranged; the diameter of the light-diffusing plate is 1.2-1.5 times the diameter of the telecentric lens.

4. The optical sensor according to claim 1, characterized in that, The distance between the light-diffusing plate and the telecentric lens is 20-40 mm.

5. The optical sensor according to claim 1, characterized in that, The light homogenizer is an engineering diffuser, a prism light homogenizer, a nanostructure light homogenizer, or a multilayer composite light homogenizer.

6. The optical sensor according to claim 5, characterized in that, The light-diffusing sheet is an engineering diffuser; the thickness of the engineering diffuser is 1-2 mm.

7. The optical sensor according to claim 5, characterized in that, The light-diffusing sheet is an engineered diffuser; the engineered diffuser includes a substrate and a plurality of microlenses disposed on the substrate; the microlenses are circular lenses; the thickness of the circular lenses is 20-40 μm and the diameter is 60-120 μm.

8. The optical sensor according to any one of claims 1-7, characterized in that, The optical sensor also includes a light-shielding tube; the light-diffusing plate and the telecentric lens are installed inside the light-shielding tube.

9. The optical sensor according to any one of claims 1-7, characterized in that, The optical sensing device includes a telecentric lens, a beam-splitting component, and a light-receiving component arranged sequentially along the optical path; wherein... The telecentric lens is an aspherical telecentric lens; the beam splitting assembly includes a bundled fiber beam splitting system; the optical receiving assembly includes multiple focusing lenses, multiple filters, and multiple photodiodes; or The telecentric lens is a spherical telecentric lens; the beam splitting assembly includes a bundled fiber beam splitting system; the light receiving assembly includes multiple focusing lenses, multiple filters, and multiple photodiodes; wherein, the optical sensing device further includes a light-diffusing tube disposed on the optical path from the telecentric lens to the beam splitting assembly.

10. The optical sensor according to claim 1, characterized in that, The light-diffusing plate and the telecentric lens are movably configured; the optical sensor further includes: A sensing device for measuring the pixel pitch of the display panel; A driving component is used to dynamically adjust the positional relationship between the light-diffusing sheet and the telecentric lens according to the pixel pitch.

11. The optical sensor according to claim 10, characterized in that, The driving component includes: Rotating wheel, the light-diffusing plate is disposed on the rotating wheel; A drive mechanism is connected to the rotating wheel; wherein the drive mechanism is used for, In response to the pixel pitch being greater than or equal to a threshold, the wheel is rotated to cause the light-diffusing plate to block the telecentric lens; In response to the pixel pitch being less than the threshold, the wheel is rotated to move the light-diffusing plate out of the field of view of the telecentric lens.

12. A color analyzer, characterized in that, include: The optical sensor is the optical sensor according to any one of claims 1-11; A signal processor for receiving and analyzing electrical signals from the optical sensor.

13. An optical correction system, characterized in that, include: Display panel to be calibrated; The color analyzer is the color analyzer as described in claim 12.

14. The optical correction system according to claim 13, characterized in that, The telecentric lens faces the display surface of the display panel, and a light-diffusing sheet is disposed between the telecentric lens and the display surface to block the telecentric lens; The optical sensor is configured to collect light emitted by the display panel under near-field conditions, wherein the pixel pitch of the display panel is greater than or equal to 2 millimeters.

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