Toshiba Portege Z30 (A-1E1, 2015) has harmless screen that can even be used for professional purposes
Toshiba is well renown for its high-quality displays in its products. Our recently reviewed budget Toshiba Satellite Click Mini tablet surprised us with a cool IPS panel, despite the low price tag.
However, the subject of this publication is the refreshed Protege Z30 (A-1E1, 2015) notebook having a 13.3-inch screen with Full HD resolution. Our initial tests show pretty good results – 338 cd/m2 maximum brightness (which is enough for even working outdoors), 6319K color temperature (pretty close to the optimal one of 6500K (D65)), and 96% coverage of the sRGB color gamut. Furthermore, after calibration we’ve recorded 1000:1 contrast ratio and extremely accurate color reproduction with DeltaE(2000) = 0.48. To put this into perspective, you will not be able to see the difference between input and output colors without the proper lab equipment.
Nevertheless, the most important thing we would want to share is the PWM tests which showed absence of screen flickering above 25% brightness. You can see it on the graph below.
Author: Rossen Pandev
![[Août 2026] Classement mondial des cartes graphiques pour ordinateurs portables les plus vendues sur Amazon : Apple règne en maître, la RTX 5060 de NVIDIA arrive en tête du classement des cartes dédiées](https://laptopmedia.com/wp-content/uploads/2026/09/Best-Selling-GPUs-GLOBAL-Top-10-400x225.jpg)
![[Août 2026] Classement mondial des processeurs d’ordinateurs portables les plus vendus sur Amazon : Apple domine aussi bien le segment économique que le segment haut de gamme. Les modèles A18 Pro et M5 écrasent Intel et AMD en août 2026](https://laptopmedia.com/wp-content/uploads/2026/09/Best-Selling-CPUs-GLOBAL-Top-10-400x225.jpg)
![[Août 2026] Amazon Global : le top 10 des ordinateurs portables les plus vendus – L’Apple MacBook Neo domine le classement tandis que les portables Windows d’entrée et de milieu de gamme se disputent les parts de marché](https://laptopmedia.com/wp-content/uploads/2026/09/Best-Selling-Laptops-GLOBAL-Top-10-400x225.jpg)
![[Août 2026] Les marques d’ordinateurs portables les plus vendues sur Amazon Global : Apple domine en termes de chiffre d’affaires tandis que HP se distingue par la diversité de ses modèles](https://laptopmedia.com/wp-content/uploads/2026/09/GLOBAL-Best-Brands-400x225.jpg)
![[Août 2026] Amazon Global : le top 10 des ordinateurs portables de jeu les plus vendus – Le HP Victus 15 s’empare de la première place alors que les modèles abordables dominent le classement](https://laptopmedia.com/wp-content/uploads/2026/09/Best-Selling-Gaming-Laptops-GLOBAL-Top-10-400x225.jpg)
Obove 25% brightness level is harmless for eyes, but what is the frequency of flickering?
The screen flickering effect occurs when the brightness level is set to 25% or below and their frequency is 215 Hz. However, 25% of the maximum brightness is about 85 cd/m2 which is too low to be honest and it will be rarely used (maybe only in pitch black environment).