US 11,988,933 B2
Display device comprising first and second viewing angle control panels and a polarization axis rotation element between the first viewing angle control panel and a display panel
Toshiharu Matsushima, Tokyo (JP)
Assigned to JAPAN DISPLAY INC., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on Sep. 22, 2022, as Appl. No. 17/950,104.
Application 17/950,104 is a continuation of application No. PCT/JP2021/002303, filed on Jan. 22, 2021.
Claims priority of application No. 2020-054362 (JP), filed on Mar. 25, 2020.
Prior Publication US 2023/0015664 A1, Jan. 19, 2023
Int. Cl. G02F 1/137 (2006.01); B60K 35/00 (2006.01); G02F 1/01 (2006.01); G02F 1/1335 (2006.01); G02F 1/13363 (2006.01); G02F 1/1347 (2006.01)
CPC G02F 1/137 (2013.01) [G02F 1/0136 (2013.01); G02F 1/133531 (2021.01); G02F 1/133638 (2021.01); G02F 1/1347 (2013.01); B60K 35/00 (2013.01); B60K 2370/25 (2019.05); B60K 2370/33 (2019.05)] 10 Claims
OG exemplary drawing
 
1. A display device comprising:
a display panel configured to modulate a first polarization component;
a first viewing angle control panel comprising a first liquid crystal layer containing twisted liquid crystal molecules;
a second viewing angle control panel comprising a second liquid crystal layer containing twisted liquid crystal molecules;
a polarization axis rotation element provided between the first viewing angle control panel and the display panel;
a first polarizer provided on a front side of the display panel;
a second polarizer provided between the display panel and the polarization axis rotation element; and
a third polarizer provided between the polarization axis rotation element and the first viewing angle control panel, wherein
the first viewing angle control panel is provided between the second viewing angle control panel and the polarization axis rotation element,
an alignment state of the first liquid crystal layer is different from an alignment state of the second liquid crystal layer,
a second polarization axis of a second polarization component which passed through the first viewing angle control panel is different from a first polarization axis of the first polarization component,
the polarization axis rotation element is configured to rotate the second polarization axis,
the polarization axis rotation element is configured to impart a half-wave retardation to the second polarization component,
the second polarizer comprises a second transmission axis which transmits the first polarization component,
the third polarizer comprises a third transmission axis which transmits the second polarization component, and
a fast axis or slow axis of the polarization axis rotation element is located in an intermediate direction between a direction of the second transmission axis and a direction of the third transmission axis.