Parallel sensing configuration covers spectrum and colorimetric quantities with spatial resolution
An optical test equipment/method for display testing that features parallel testing/sensing configuration that covers spectrum and colorimetric quantities with spatial resolution is disclosed. In one embodiment, a spectra-camera, which is a hybrid system consisting of both a single-point spectrometer and an imaging colorimeter, can be configured for concurrent display artifact and parametric testing. An aperture mirror with a hole in the middle splits an image of a test display into two parts. One part of the image passes through the hole and is directed to the spectrometer for display parametric testing. The rest of the image is reflected off the aperture mirror for concurrent display artifact testing with the colorimeter. In another embodiment, a beam splitter can be used instead of an aperture mirror. In yet another embodiment, the single-point high accuracy spectrometer can be used to calibrate the low accuracy imaging colorimeter.
1. A method for performing an optical test, the method comprising:
by a spectra camera:
receiving a sample of light to form an image;
splitting the image into a first image and a second image;
using a narrowband device to measure a first area of the first image to identify parametric data;
using a broadband device to measure a second area of the second image to identify display artifacts, and
concurrently calibrating, using the sample of light, the broadband device and the narrowband device based on measurements of the first area and the second area.
2. The method of claim 1 , wherein splitting the image into the first image and the second image comprises using a mirror having an aperture, wherein the sample of light reflecting off the mirror forms the first image and light passing through the aperture forms the second image.
3. The method of claim 2 , wherein the mirror comprises more than one aperture and each aperture is positioned to optimize measuring of the second area of the second image.
4. The method of claim 1 , wherein measuring the first area on the first image to identify the parametric data is performed by: a Czerny-Turner spectrometer, a Lens-Grating-Lens (LGL) spectrometer, or a Mirror-Grating-Mirror (MGM) spectrometer.
5. The method of claim 1 , further comprising:
when parametric data is identified, using the parametric data to calibrate the measuring of the second area on the second image to identify the display artifacts.
6. The method of claim 1 , wherein splitting the image into the first image and the second image comprises using a beam splitter to split the image such that the first image is substantially identical to the second image.
7. A spectra camera configured to perform measurements to identify display artifacts and parametric data, the spectra camera comprising:
a splitter configured to split an image into a first image and a second image;
a broadband device configured to measure a first area of the first image to identify the display artifacts;
a first image pipeline configured to direct the first image to the broadband device, wherein the first pipeline is used to calibrate the broadband device;
a narrowband device configured to measure a second area of the second image to identify the parametric data; and
a second image pipeline configured to direct the second image to the narrowband device, wherein the second pipeline is used to concurrently calibrate the narrowband device with the broadband device.
8. The spectra camera of claim 7 , wherein the splitter is an aperture mirror with an aperture in the middle such that light reflecting off the aperture mirror forms the first image and light passing through the aperture forms the second image.
9. The spectra camera of claim 7 , wherein the splitter is a beam splitter.
10. The spectra camera of claim 7 , wherein the narrowband device is a spectrometer.
11. The spectra camera of claim 10 , wherein the broadband device is an imaging colorimeter.
12. The spectra camera of claim 11 , wherein the spectrometer is used to calibrate the imaging colorimeter.
13. The spectra camera of claim 7 , wherein the narrowband device is a high accuracy narrowband device configured to measure the second area, wherein the second area is a single spot of the second image.
14. The spectra camera of claim 7 , wherein the broadband device is a low accuracy broadband device configured to measure the first area.
15. The spectra camera of claim 7 , wherein the narrowband device is detachable from the spectra camera.
16. A non-transitory computer readable medium configured to store instructions that, when executed by a processor communicatively coupled to a spectra camera, cause the spectra camera to carry out steps that include:
receiving a sample of light to form an image;
splitting the image into a first image and a second image;
using a narrowband device to measure a first area of the first image to identify parametric data;
using, concurrently with the narrowband device, a broadband device to measure a second area of the second image to identify display artifacts; and
concurrently calibrating, using the sample of light, the broadband device and the narrowband device based on measurements of the first area and the second area.
17. The non-transitory computer readable storage medium of claim 16 , wherein splitting the image into the first image and the second image comprises using a mirror having an aperture, wherein the sample of light reflecting off the mirror forms the first image and light passing through the aperture forms the second image.
18. The non-transitory computer readable storage medium of claim 16 , wherein the simultaneous calibration comprises using measurements of the second area on the second image to compare with measurements of the first area on the first image.
19. The non-transitory computer readable storage medium of claim 18 , wherein the simultaneous calibration comprises using tristimulus values of the narrowband device to calibrate tristimulus values of the broadband device.
20. The non-transitory computer readable storage medium of claim 19 , wherein steps further include:
when the tristimulus values of the broadband device are not within a tolerance specification of the tristimulus values of the narrowband device:
recalibrating the broadband device.