講義參考教案2016.12.test28rev

1、TrueTest Blackmura MeasurementRyan BeatyTechnical Sales ManagerDecember 7, 2016DUT: iPhone 7 PlusPixel resolution: 1920 x 1080; Hor. x Vert.Active area dimensions: 97.4 x 54.8 mm; 5.5 inch diagonalSetupTo allow for rotation alignment of the display, it is mounted on a tripod with gear-head. The disp

2、lay is set to show the Adjustment Pattern. In this case an iPhone 7 Plus is testedCamera: Radiant IC-PMI2Pixel resolution: 1600 x 1200; Hor. x Vert.The DUT is an iPhone 7 Plus, mounted on a tripod with gear-head for convenient angular adjustmentThe alignment window is opened. With the live capture o

3、f images, the display positioning can be optimized.For each image the 5 dots in the pattern are automatically localized.The derived rotation angles and offset values are refreshed to allow accurate optimizationDisplay AlignmentAlignment window refreshing the angular & offset measurementAuto-detectio

4、n of the pattern dotsRefreshing measurement of rotation & offsetBlackMura DefocusThe 1st line in the test sequence is for auto-defocusing the camera lens to the correct levelIn an iteration process the focal distance is changed. The modulation depth is measured on Grill H4 and V4.If the modulation d

5、epth falls within the required range the test passes, and TrueTest will move to the next line in the Test SequenceV4 grill patchH4 grill patchPWM CheckThe 2nd line in the test sequence is to check if Pulse Width Modulation affects the measurementThe luminance is measured on a rectangular area at the

6、 center of the display. This is repeated multiple times, after which the variation in luminance is checked between measurementsIf the variation in luminance values is small, the test passes and the test sequences moves to the next lineResultsThe 3rd line in the test sequence is to perform the actual Black Mura MeasurementThe display automatically changes between the White and Black test pattern. The Blackmura test is performed according to Blackmura Rev. 1.