Patent ID: 11874549
Assignee: SHARP DISPLAY TECHNOLOGY CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The optical element according to claim 1,
wherein an in-plane retardation Re (nm) introduced to light having a wavelength of 550 nm by the first phase difference layer or the second phase difference layer, whichever satisfies the formula (i) or (iii), and a thickness direction retardation Rth (nm) introduced to light having a wavelength of 550 nm by the first phase difference layer or the second phase difference layer, whichever satisfies the formula (ii) or (iv), satisfy the following formulas (4), (5), and (6):

Re≥0.45×Rth+320   (4)

Re≤3.13×Rth−490   (5)

Re≤−0.42×Rth+644   (6).