CN215262346U - Spectrum visual angle characteristic measuring system - Google Patents
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- CN215262346U CN215262346U CN202122827424.3U CN202122827424U CN215262346U CN 215262346 U CN215262346 U CN 215262346U CN 202122827424 U CN202122827424 U CN 202122827424U CN 215262346 U CN215262346 U CN 215262346U
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Abstract
The utility model discloses a spectrum visual angle characteristic measurement system. The system comprises: lens module and spectral measurement device that sets gradually along the light source outgoing direction that awaits measuring, the lens module includes F-theta lens, spectral measurement device includes a plurality of light receiving port, and is a plurality of light receiving port all set up in the Fourier spectral plane of F-theta lens or on the imaging surface of Fourier spectral plane to receive the optical signal of a plurality of visual angles. The utility model discloses can be simultaneously and the spectrum under the multiple visual angles of a plurality of azimuths of rapid survey.
Description
Technical Field
The utility model belongs to the technical field of measure, more specifically relates to a spectrum visual angle characteristic measurement system.
Background
With the rapid development of display technology, the application scenes of large-area and high-resolution display screens are more and more extensive, and new requirements are also put forward in the field of display screen quality monitoring, namely, the screen occupation ratio is more and more large when a camera captures images, which also means that the image capturing visual angle of the camera is more and more large. Ideally, the light emission characteristics of the display screen are consistent with the lambertian body light emission characteristics, that is, the light emission intensities in all directions are consistent, and the spectrums in all directions are also consistent. Due to the characteristics of the cavity structure of a single pixel of the display screen, the actual screen body has different luminous intensities in all directions and shifts spectrum, so that the chromaticity can be changed, which is called as the visual angle characteristic of the display screen. Because the camera and the lens are bound to have a visual angle when taking images, and the larger the screen occupation ratio is, the larger the image-taking visual angle of the display screen is, the more serious the influence of the visual angle characteristic of the screen body on the precision of obtaining the brightness of the display screen based on image taking is, so that the precision of subsequent Demura, AOI and the like is reduced, and the influence of improving the visual angle characteristic on the image-taking precision of the camera based on the measurement result of the visual angle characteristic of the screen body is more important. The change in chrominance luminance is only apparent and the spectral change is essential. Therefore, the change of the spectrum under different azimuth angles and different viewing angles needs to be measured, the reason for the change of the chroma brightness along with the azimuth angle and the viewing angle can be found, and the rationality of the change of the chroma brightness along with the viewing angle is confirmed.
In addition, near-eye display technologies such as AR/VR are rapidly developed, and near-eye display equipment (NED) is typically characterized by a large field of view, the maximum field of view of the current AR equipment can reach more than 120 degrees, and the maximum VR can reach 50 degrees. The uniformity of screen brightness and chromaticity in such a large visual field directly affects the sense of users, and is an important index for controlling the quality of the NED equipment, so that the monitoring of chromaticity brightness, spectrum and the like of the NED equipment at different visual angles is urgently needed.
The conversion of the camera image data into luminance and chrominance information requires a calibration process, and the calibration accuracy or the chrominance and luminance measurement accuracy is also affected by many factors, such as the spectral difference of different pixel points of the display screen, the accuracy of the reference data used for calibration, and the like. And accurate brightness and chromaticity information can be obtained without a calibration process based on the spectral information, so that the measurement of spectral distribution under different viewing angles can more accurately describe the viewing angle characteristics of the display screen or the light source than the measurement of chromaticity and brightness distribution under different viewing angles.
In the prior art, a method for measuring the visual angle distribution of a spectrum generally uses a cone lens and a plurality of band pass filters, and captures an image of the same display screen picture under a plurality of filters respectively, and finally synthesizes a plurality of pictures to obtain the spectrum of the whole visible light band. The large number of bandpass filters is needed to cover the whole visible light band, which means that the hardware size is large, the time consumption of the measurement process is long, and the requirement on the rear intercept of the lens is high. The other method is to fix a plurality of spectrometers along an arc-shaped guide rail and measure spectra of the same point at different angles, but the method is intuitive, but can only measure spectra of different viewing angles at one azimuth angle and cannot simultaneously measure spectra of multiple viewing angles at multiple azimuth angles. From the perspective of production line application cost, a spectrum measuring device capable of rapidly realizing multi-azimuth and multi-view angles is urgently needed in the market.
SUMMERY OF THE UTILITY MODEL
To prior art's at least one defect or improvement demand, the utility model provides a spectrum visual angle characteristic measurement system can be simultaneously and the spectrum under the multiple visual angles of a plurality of azimuths of rapid survey.
In order to achieve the above object, the utility model provides a spectrum visual angle characteristic measurement system, include: lens module and spectral measurement device that sets gradually along the light source outgoing direction that awaits measuring, the lens module includes F-theta lens, spectral measurement device includes a plurality of light receiving ports, and is a plurality of light receiving port all set up in on the Fourier spectral surface of F-theta lens or the image plane of Fourier spectral surface to receive the optical signal of a plurality of visual angles.
Further, the lens module is a cone lens.
Further, the lens module further comprises a lens group for reducing the size of the Fourier spectrum plane of the F-theta lens, the lens group is arranged on the Fourier spectrum plane of the F-theta lens or the imaging plane of the Fourier spectrum plane, and the plurality of light receiving ports are arranged on the image plane of the lens group.
Furthermore, the lens group comprises a field lens and an image rotating lens which are sequentially arranged, and the plurality of light receiving ports are arranged on an image surface of the image rotating lens.
Further, the number of the light receiving ports is M × N, M, N are each an integer not less than 1, and the M × N light receiving ports are each provided on a fourier spectrum plane of the F- θ lens or an imaging plane of the fourier spectrum plane and are two-dimensionally distributed along two dimensions.
Further, the spectrum measuring device also comprises one or more spectrometers, and the spectrometers are arranged at the output ends of the light receiving ports.
Further, the spectral measurement device includes a camera chip.
The spectrum measuring device further comprises a controller, and the controller receives and processes the acquired signal of the spectrum measuring device to obtain the spectrum visual characteristics of the light source to be measured.
Further, the light source to be detected is a display screen.
Further, the light source to be measured is near-eye display equipment.
Generally, compared with the prior art, the utility model, beneficial effect has: on one hand, the spectrum measurement of a plurality of azimuth angles and a plurality of visual angles can be realized simultaneously and rapidly, and the problems that the existing equipment is large in size and slow in measurement speed or cannot measure the spectra of the plurality of azimuth angles simultaneously are solved; on the other hand, the spectrum under a plurality of azimuths and a plurality of visual angles can be output only by single image capture, and compared with the technical scheme that the cone beam lens is matched with N band-pass filters, the measuring time is shortened by N times, and the method is more suitable for production line application.
Drawings
Fig. 1 is a schematic diagram of a spectral viewing angle characteristic measurement system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a spectral viewing angle characteristic measuring system according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a spectral viewing angle characteristic measurement system according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Example one
The utility model discloses spectrum visual angle characteristic measurement system of embodiment, include: a spectral viewing angle characteristic measurement system, comprising: the lens module and the spectral measurement device are sequentially arranged along the emergent direction of the light source to be measured, the lens module comprises an F-theta lens, the spectral measurement device comprises a plurality of light receiving ports, and the plurality of light receiving ports are arranged on a Fourier spectral surface of the F-theta lens or an imaging surface of the Fourier spectral surface so as to receive optical signals of a plurality of visual angles.
Any light source to be measured can be considered as a collection of point light sources.
The point light source can obtain light intensity distribution within a certain visual angle range under the 360-degree azimuth angle after passing through the F-theta lens in the lens module, and the light intensity distribution plane is called as a Fourier spectrum plane. The light receiving ports are arranged on a Fourier spectrum plane or an imaging plane of the Fourier spectrum plane of the F-theta lens to receive optical signals of a plurality of visual angles. If the light receiving port is not directly arranged on the fourier spectrum plane of the F- θ lens, the fourier spectrum plane of the F- θ lens is imaged by other optical elements first, and the light receiving port interface is arranged on the image plane of the other optical elements, the light receiving port may be arranged on the imaging plane of the fourier spectrum plane, which may be but is not limited to primary imaging, secondary imaging, and the like.
Further, the light source to be measured may be any light source requiring spectrum measurement, such as a display screen, a near-eye display device (NED), and the like.
Alternatively, the lens module only comprises the F-theta lens, the spectrum measuring device is directly arranged on the Fourier spectrum plane of the F-theta lens, namely the F-theta lens solely forms the lens module, and the plurality of light receiving ports are arranged on the Fourier spectrum plane of the F-theta lens.
Optionally, the lens module further includes a lens group for reducing the size of the fourier spectrum plane of the F-theta lens, the lens group being disposed on the fourier spectrum plane of the F-theta lens or on an imaging plane of the fourier spectrum plane, and the spectrum measuring device being disposed on an image plane of the lens group.
Optionally, the lens group comprises a field lens and a relay lens arranged in sequence.
Example two
As shown in fig. 1, the present invention provides a spectral viewing angle characteristic measurement system, including: the lens module comprises an F-theta lens and a lens group which are sequentially arranged, the lens group is arranged on a Fourier spectrum surface of the F-theta lens or an imaging surface of the Fourier spectrum surface, the spectrum measuring device comprises a plurality of light receiving ports, and the plurality of light receiving ports are all arranged on an image surface of the lens group.
Further, the lens module is a cone lens.
Further, the spectral measurement apparatus includes a camera chip.
Furthermore, the lens group comprises a field lens and an image rotating lens which are sequentially arranged, and the plurality of light receiving ports are all arranged on an image surface of the image rotating lens.
Further, the optical lens can also comprise other diaphragms, and the diaphragms are arranged between the field lens and the image rotating lens and limit the light beams.
The point light source can obtain light intensity distribution within a certain visual angle range under an azimuth angle of 360 degrees after passing through the F-theta lens, the light intensity distribution plane is called as a Fourier spectrum plane, and the field lens and the image transfer lens behind the field lens reduce the Fourier spectrum plane and image the Fourier spectrum plane on a camera chip. When the test visual angle is bigger, the size of the Fourier spectrum surface is bigger, if the camera chip with the corresponding size is directly used for receiving the Fourier spectrum surface, two problems can be faced, firstly, the size of the camera chip is bigger, the cost is higher, secondly, the image is too big, the storage cost is also higher and the data processing speed is slow, and therefore, the lens group is adopted to compress and transfer the size of the Fourier spectrum surface to the camera chip with the conventional size.
EXAMPLE III
As shown in fig. 2, a spectral viewing angle characteristic measuring system includes: the system comprises a cone light lens and a spectrum measuring device, wherein the cone light lens and the spectrum measuring device are sequentially arranged along the emergent direction of a light source to be measured, the cone light lens comprises an F-theta lens and a lens group which are sequentially arranged, the lens group is arranged on a Fourier spectrum surface of the F-theta lens, and the spectrum measuring device is arranged on an image surface of the lens group.
Further, the lens group comprises a field lens and an image rotating lens which are arranged in sequence.
Further, the optical lens can also comprise other diaphragms, and the diaphragms are arranged between the field lens and the image rotating lens and limit the light beams.
Furthermore, the spectrum measuring device comprises a spectrometer and a plurality of light receiving ports, wherein the light receiving ports are all arranged on the Fourier spectrum surface of the F-theta lens or the imaging surface of the Fourier spectrum surface, and the spectrometer is arranged at the output end of the light receiving ports to receive the output light signals of the light receiving ports.
In other words, the embodiment of the utility model provides a based on the characteristics of conoscopic lens, put all light receiving ports on the image plane of conoscopic lens to can receive the intensity under a plurality of visual angles in a plurality of azimuths, convert this intensity into spectral output through the spectrum appearance, and then realize the spectral measurement under a plurality of visual angles in a plurality of azimuths.
Further, the number of the light receiving ports is M × N, M, N are each an integer not less than 1, and the M × N light receiving ports are each disposed on an imaging plane of the fourier spectrum plane and are two-dimensionally distributed along two dimensions, for example, M in each row, for N rows. The position of each light receiving port corresponds to a viewing angle at an azimuth angle, so that the M × N receiving ports correspond to a plurality of viewing angles at a plurality of azimuth angles.
As an alternative, the spectrum measuring apparatus includes a plurality of spectrometers, each spectrometer includes a corresponding light receiving port, and all the light receiving port spectrometers are disposed on an image surface of the lens group, that is, an image surface of the relay lens.
Furthermore, the spectrum visual angle characteristic measuring system also comprises a controller, wherein the controller receives and processes the acquisition signal of the spectrum measuring device to obtain the spectrum visual characteristic of the light source to be measured.
Example four
As shown in fig. 3, the present invention provides a spectral viewing angle characteristic measurement system, including: the spectrum measuring device comprises a plurality of light receiving ports, and the plurality of light receiving ports are arranged on a Fourier spectrum surface of the F-theta lens to receive optical signals of a plurality of visual angles.
Further, the spectral measurement device further comprises a spectrometer, and the spectrometer is arranged at the output end of the light receiving port to receive the output light signal of the light receiving port.
Further, the number of the light receiving ports is M × N, M, N are each an integer not less than 1, and the M × N light receiving ports are each disposed in a fourier spectrum plane of the F- θ lens and are two-dimensionally distributed along two dimensions.
Furthermore, the spectrum visual angle characteristic measuring system also comprises a controller, wherein the controller receives and processes the acquisition signal of the spectrum measuring device to obtain the spectrum visual characteristic of the light source to be measured.
Compared with the structure of the third embodiment, the structure of the fourth embodiment has two advantages, namely, the structure of the lens is greatly simplified, the cost of the lens is greatly reduced, the whole device is more compact and is convenient to install and use, and the size of the Fourier spectrum surface is far larger than that of the image surface of the image transfer lens, so that more space is provided for the receiving port of the multi-point spectrometer, and the multi-point spectrometer is convenient to arrange and fix.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A spectral viewing angle characteristic measurement system, comprising: lens module and spectral measurement device that sets gradually along the light source outgoing direction that awaits measuring, the lens module includes F-theta lens, spectral measurement device includes a plurality of light receiving ports, and is a plurality of light receiving port all set up in on the Fourier spectral surface of F-theta lens or the image plane of Fourier spectral surface to receive the optical signal of a plurality of visual angles.
2. The system for measuring spectral viewing angle characteristics of claim 1, wherein said lens module is a conoscope lens.
3. A spectral viewing angle characteristic measuring system according to claim 1 or 2, wherein said lens module further comprises a lens group for reducing a size of a fourier spectrum plane of said F-theta lens, said lens group being disposed on a fourier spectrum plane of said F-theta lens or an image plane of said fourier spectrum plane, a plurality of said light receiving ports being disposed on an image plane of said lens group.
4. The system for measuring spectral viewing angle characteristics of claim 3, wherein said lens group comprises a field lens and an image relay lens arranged in sequence, and a plurality of said light receiving ports are arranged on an image plane of said image relay lens.
5. A spectral viewing angle characteristic measuring system according to claim 1, wherein the number of said light receiving ports is M × N, and M, N are each an integer not less than 1, and M × N of said light receiving ports are each provided on a fourier spectrum plane of said F- θ lens or an image plane of said fourier spectrum plane, and are two-dimensionally distributed along two dimensions.
6. A system for measuring spectral viewing angle characteristics as in claim 1, wherein said spectral measuring device further comprises one or more spectrometers, said spectrometers being disposed at the output of said light receiving ports.
7. The spectral viewing angle characteristic measuring system of claim 1, wherein the spectral measuring device comprises a camera chip.
8. The system according to claim 1, further comprising a controller, wherein the controller receives the collected signal of the spectrum measuring device and processes the signal to obtain the spectral visual characteristic of the light source to be measured.
9. The system according to claim 1, wherein the light source to be measured is a display screen.
10. The system for measuring spectral viewing angle characteristics of claim 1, wherein the light source under test is a near-eye display device.
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| CN202122827424.3U CN215262346U (en) | 2021-11-18 | 2021-11-18 | Spectrum visual angle characteristic measuring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116878660A (en) * | 2023-08-30 | 2023-10-13 | 武汉精立电子技术有限公司 | Chromaticity measuring device and method |
| WO2025032983A1 (en) * | 2023-08-09 | 2025-02-13 | 株式会社トプコンテクノハウス | Photometric device and condenser lens unit |
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2021
- 2021-11-18 CN CN202122827424.3U patent/CN215262346U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025032983A1 (en) * | 2023-08-09 | 2025-02-13 | 株式会社トプコンテクノハウス | Photometric device and condenser lens unit |
| CN116878660A (en) * | 2023-08-30 | 2023-10-13 | 武汉精立电子技术有限公司 | Chromaticity measuring device and method |
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Effective date of registration: 20240621 Address after: 430205 No.22 liufangyuan South Road, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee after: WUHAN JINGLI ELECTRONIC TECHNOLOGY Co.,Ltd. Country or region after: China Patentee after: WUHAN JINGCE ELECTRONIC GROUP Co.,Ltd. Address before: No.22, South liufangyuan Road, Donghu New Technology Development Zone, Wuhan, Hubei 430205 Patentee before: Wuhan Jingchuang Electronic Technology Co.,Ltd. Country or region before: China |