Test Bench

JVC DLA-X590R D-ILA Pro­jec­tor

Sound & Vision - - TEST BENCH -

FULL-ON/FULL-OFF Con­trast Ra­tio (SDR): 27,400:1

THESE mea­sure­ments and charts were pro­duced us­ing Spec­tra­cal’s CALMAN soft­ware, to­gether with Photo Re­search PR-650 and Klein K-10A color me­ters and a test-pat­tern gen­er­a­tor from Murideo. The pic­ture set­tings used here will be posted at soun­dand­vi­sion.com. All mea­sure­ments were taken at ap­prox­i­mately 14 feet from a 96-inch-wide, 1.3-gain Ste­wart Film­screen Stu­diotek 130 screen.

THE SDR peak white read­ing for this mea­sure­ment was 27.4 ft-l (93.9 nits), and the black level was 0.001 ft-l (0.0034 nit). These mea­sure­ments were read from my Ste­wart screen us­ing the Klein me­ter in the ap­prox­i­mate mid­dle of the pro­jec­tor’s zoom range.

FOR HDR, as cal­i­brated, the full-on/full-off con­trast ra­tio mea­sured 13,869:1 at a peak white level of 55.4 ft-l (190 nits with a 10% white win­dow) and a black level of 0.004 ft-l (0.0137 nit).

THE charts shown above are for SDR. Be­fore cal­i­bra­tion in the SDR Cin­ema Pic­ture Mode, the grayscale Delta Es ranged from a min­i­mum of 2.59 at 40% to a max­i­mum of 5.1 at 60%. Af­ter cal­i­bra­tion, the min­i­mum was 0.57 at 80% and the max­i­mum 1.71 at 50%. The post-cal­i­bra­tion red, green, and blue SDR color Delta Es were all be­low 3.35 af­ter cal­i­bra­tion, but cyan, ma­genta, and yel­low were a less im­pres­sive 4.1 to 5.37—with their er­rors pri­mar­ily in lu­mi­nance (the x/y co­or­di­nates were much more ac­cu­rate than those Delta E val­ues might sug­gest). At a set­ting of 2.4, the SDR post-cal­i­bra­tion gamma ranged from a max­i­mum of 2.4 at 90% to be­tween 2.29 and 2.34 from 20% to 80%.

DELTA E is a fig­ure of merit in­di­cat­ing how close the re­sult comes to the tar­get value. Delta Es be­low 3—some ex­perts al­low for 4—are gen­er­ally con­sid­ered vis­ually in­dis­tin­guish­able from ideal. From 3.0 (or 4.0) to 10.0, most view­ers will no­tice the de­vi­a­tions but will not likely find them ob­jec­tion­able.

THE HDR re­sults shown be­low were de­rived with the CMS off. The JVC’S HDR color performance, in my tests over­all, was bet­ter with the pro­jec­tor’s CMS turned off—even af­ter the lat­ter had been di­aled in dur­ing cal­i­bra­tion.

OUR ex­pe­ri­ence sug­gests that post­cal­i­bra­tion HDR Delta Es that ex­ceed the rec­om­men­da­tions shown above are not un­com­mon, par­tic­u­larly when lu­mi­nance er­rors are in­cluded. But with lu­mi­nance er­rors ex­cluded, the pro­jec­tor’s post-cal­i­bra­tion HDR Delta Es never ex­ceeded 3.0.

AS with all UHD/HDR dis­plays we’ve tested, the JVC falls well short of full cov­er­age of BT.2020. But it did an im­pres­sive job with P3—more sig­nif­i­cant to­day than full BT.2020, as no con­sumer ma­te­rial we know of ex­ceeds P3. As cal­i­brated (with the re­sults from the same mea­sure­ment on the DLA-X790R in its BT.2020 color pro­file shown in paren­the­ses), and us­ing the

1976 CIE stan­dard, the DLA-X590R cov­ered 69.2% (73.1%) of BT.2020 and 94.2% (98%) of P3 in­side the BT.2020 con­tainer.

AS is com­mon for an HDR dis­play, the HDR peak white var­ied with the size of the white win­dow used for the mea­sure­ment. On the X590R (the re­sults for the X790R are shown in paren­the­ses), these re­sults, in nits, were 65 (50) for a 2% win­dow, 140 (110) at 5%, 185 (141) at 10%, 205 (160) at 25%, and 203 (160) at 100%.— TJN

AF­TER Cal­i­bra­tion

BE­FORE Cal­i­bra­tion

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