| 摘要 |
In case polarization plates ( 10 A, 10 B) including protective layers whose phase difference is negative are used, a retardation film optimized for the negative phase difference is placed in a position (P 1 ) between a liquid crystal plane ( 20 ) and outgoing-side polarization plate ( 10 A), in a position (P 2 ) between the outgoing-side polarization plate ( 10 A) and liquid crystal plate ( 20 ) or in both the positions (P 1 , P 2 ) 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.
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