Patent ID: 11914236
Assignee: SHARP DISPLAY TECHNOLOGY CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A liquid crystal display device comprising:
a liquid crystal panel provided with sub-pixels arranged in a matrix pattern; and
a control circuit,
wherein the liquid crystal panel sequentially includes an active matrix substrate, a liquid crystal layer, and a color filter substrate,
the active matrix substrate sequentially includes a first substrate, a first electrode, a first insulating layer, and second electrodes arranged in the respective sub-pixels and including a first linear electrode extending in a first direction,
the color filter substrate includes a second substrate, a black matrix lying between the sub-pixels, a color filter layer, a third electrode including second linear electrodes, and a fourth electrode which is a floating electrode,
the third electrode and the fourth electrode are disposed between the black matrix and the liquid crystal layer,
the second linear electrodes extend in a second direction that intersects the first direction and each overlaps a portion of the black matrix extending in the second direction,
the fourth electrode is disposed between the second linear electrodes and overlaps at least a portion of the black matrix in a plan view,
the control circuit is configured to switch between a first display mode and a second display mode and switch between an application of a driving voltage to the third electrode in the first display mode and an application of a constant voltage to the third electrode in the second display mode, the first display mode allowing a first image to be observed in a narrow viewing angle range including a direction normal to the liquid crystal panel, the second display mode allowing the first image to be observed in a wide viewing angle range including the narrow viewing angle range, and
in the first display mode, the control circuit is further configured to control the driving voltage applied to the third electrode to be at a frequency that is twice a frequency of a driving voltage applied to the second electrodes.