| 摘要 |
In case polarization plates (10A, 10B) including protective layers whose phase difference is negative are used, a retardation film optimized for the negative phase difference is placed in a position (P1) between a liquid crystal plane (20) and outgoing-side polarization plate (10A), in a position (P2) between the outgoing-side polarization plate (10A) and liquid crystal plate (20) or in both the positions (P1, P2) to reduce the leakage of black-level light directed at an angle 45 deg. Thus, in the in-plane switching (IPS) mode type liquid crystal display device, optical compensation is made to improve the viewing angle in black display. <IMAGE>
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