# US 2014/0192209 A1 · Parallel sensing configuration covers spectrum and colorimetric quantities with spatial resolution

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- Number: US 2014/0192209 A1
- Document ID: US20140192209A1
- Status: Published application
- Kind: A1
- Application number: 13/736,008
- Filed: 2013-01-07
- Published: 2014-07-10
- Earliest claimed: 2013-01-07
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Ye YIN; Gabriel Marcu; Julia C. Davoud
- Web page: https://patentgrep.com/patent/US20140192209A1

## CPC

- G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)}
- G01J 3/02: Details
- G01J 3/021: {using plane or convex mirrors, parallel phase plates, or particular reflectors}
- G01J 3/18: using diffraction elements, e.g. grating (gratings per se G02B)
- G01J 3/506: {measuring the colour produced by screens, monitors, displays or CRTs}
- G01J 3/51: using colour filters
- G01J 3/513: {having fixed filter-detector pairs}
- G01J 3/524: {Calibration of colorimeters}
- G02F 1/13: based on liquid crystals, e.g. single liquid crystal display cells
- G01J 2003/2826: {Multispectral imaging, e.g. filter imaging}
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

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.

## Claims

### Claim 1

A method for performing concurrent display artifact and parametric testing, the method comprising:
splitting an image of a display into a first image and a second image;
sending the first image for display artifact testing; and
sending, concurrently with the first image, the second image for display parametric testing.

### Claim 2 (depends on 1)

The method of claim 1, wherein the display artifact testing is performed concurrently with the display parametric testing.

### Claim 3 (depends on 2)

The method of claim 2, wherein splitting an image of a display into a first image and a second image comprises using a mirror with a hole in the middle, wherein light reflecting off the mirror with the hole in the middle forms the first image and light passing through the hole forms the second image.

### Claim 4 (depends on 2)

The method of claim 2, wherein splitting an image of a display into a first image and a second image comprises using a beam splitter to split the image of the display such that the first image is substantially identical to the second image.

### Claim 5 (depends on 3)

The method of claim 3, wherein the display parametric testing is performed by a Czerny-Turner spectrometer.

### Claim 6 (depends on 3)

The method of claim 3, wherein the display parametric testing is performed by a Lens-Grating-Lens (LGL) spectrometer.

### Claim 7 (depends on 3)

The method of claim 3, wherein results of the display parametric testing for the second image can be used to calibrate results of the display artifact testing for the first image.

### Claim 8

A display testing system configured to perform concurrent display artifact and parametric testing, the display testing system comprising:
a splitter configured to split an image of a display into a first image and a second image;
a display artifact tester configured to perform display artifact testing of the first image;
a first image pipeline configured to direct the first image to the display artifact tester;
a display parametric tester configured to perform display parametric testing of the second image; and
a second image pipeline configured to direct the second image to the display parametric tester.

### Claim 9 (depends on 8)

The system of claim 8, wherein the splitter is an aperture mirror with a hole in the middle such that light reflecting off the aperture mirror forms the first image and light passing through the hole forms the second image.

### Claim 10 (depends on 8)

The system of claim 8, wherein the splitter is a beam splitter.

### Claim 11 (depends on 9)

The system of claim 9, wherein the display parametric tester is a spectrometer.

### Claim 12 (depends on 11)

The system of claim 11, wherein the display artifact tester is an imaging colorimeter.

### Claim 13 (depends on 12)

The system of claim 12, wherein the spectrometer is used to calibrate the imaging colorimeter.

### Claim 14 (depends on 13)

The system of claim 13, wherein the spectrometer is a Czerny-Turner spectrometer.

### Claim 15 (depends on 14)

The system of claim 14, wherein the imaging colorimeter is a Bayer filter type imaging colorimeter.

### Claim 16 (depends on 8)

The system of claim 8, wherein the display parametric tester is detachable.

### Claim 17

A computer program product encoded in a non-transitory computer readable medium for performing concurrent display artifact and parametric testing, the computer program product comprising:
computer code for display artifact testing, wherein an image of a display is split into a first image and a second image, wherein the first image is sent to an imaging colorimeter for display artifact testing and the second image is sent to a spectrometer for display parametric testing; and
computer code for display parametric testing.

### Claim 18 (depends on 17)

The computer program product of claim 17, the computer program product further comprising:
computer code for using results of the display parametric testing for the second image to calibrate results of the display artifact testing for the first image.

### Claim 19 (depends on 18)

The computer program product of claim 18, wherein the computer code for using results of the display parametric testing for the second image to calibrate results of the display artifact testing for the first image comprises:
computer code for using tristimulus values of the spectrometer to calibrate tristimulus values of the imaging colorimeter.

### Claim 20 (depends on 19)

The computer program product of claim 19, wherein the computer code for using tristimulus values of the spectrometer to calibrate tristimulus values of the imaging colorimeter comprises:
computer code for recalibration of the imaging colorimeter if the tristimulus values of the imaging colorimeter is not within a tolerance specification of the tristimulus values of the spectrometer.