A switchable privacy display includes a spatial light modulator (SLM), a first switchable liquid crystal retarder and a first passive retarder disposed between a first pair of polarizers, and a second switchable liquid crystal retarder and a second passive retarder disposed between a second pair of polarizers. The first switchable liquid crystal retarder includes two homeotropic alignment layers and the second switchable liquid crystal retarder includes two surface alignment layers. In a privacy mode of operation, coaxial light from the spatial light modulator is non-destructively directed, while the off-axis light has reduced brightness to reduce visibility of the display to an off-axis snooper. The display may be rotated to enable privacy operations in a landscape orientation and a landscape orientation. The display may also be operated to switch between daytime and nighttime operations, such as for use in an automotive environment.
一种可切换隐私显示器包括空间光调制器(SLM)、被布置在第一对偏振器之间的第一可切换液晶延迟器和第一无源延迟器、以及被布置在第二对偏振器之间的第二可切换液晶延迟器和第二无源延迟器。第一可切换液晶延迟器包括两个垂面取向层,并且第二可切换液晶延迟器包括两个沿面取向层。在隐私操作模式下,来自空间光调制器的同轴光被无损地引导,而离轴光具有降低的亮度以降低显示器对于离轴窥探者的可见性。显示器可以被旋转来实现横屏方位和竖屏方位上的隐私操作。显示器还可以被操作来在白天和夜间操作之间切换,例如用于汽车环境中。
Directional display device
定向显示设备
2023-03-07
Patent
Electronic Resource
Chinese
IPC: | B60J WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES , Fenster, Windschutzscheiben und bewegbare Dächer, Türen oder Ähnliches für Fahrzeuge |
DIRECTIONAL DISPLAY CONTROL DEVICE, DIRECTIONAL DISPLAY METHOD, AND PROGRAM
European Patent Office | 2025
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