Patent ID: 11927850
Assignee: SHARP DISPLAY TECHNOLOGY CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The liquid crystal display device according to claim 5,
wherein each of the first retardation layer and the second retardation layer is in any one of modes (1), (2), and (3):
(1) a mode in which an NZ factor is 1.4≤NZ<1.6 and an absolute value |R0| of an in-plane phase difference R0 satisfies the following inequalities (1-1) and (1-2):

|R0|≥−325×NZ+710  (1-1)

|R0|≤225×NZ−50  (1-2),

(2) a mode in which the NZ factor is 1.6≤NZ<3.0 and the absolute value |R0| of the in-plane phase difference R0 satisfies the following inequalities (2-1) and (2-2):

|R0|≥−57×NZ+281  (2-1)

|R0|≤−114×NZ+493  (2-2), and

(3) a mode in which the NZ factor is 3.0≤NZ≤4.0 and the absolute value |R0| of the in-plane phase difference R0 satisfies the following inequalities (3-1) and (3-2):

|R0|≥−10×NZ+140  (3-1)

|R0|≤−40×NZ+270  (3-2).