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    • 19. 发明授权
    • Method of identifying location using a master clock to synchronize time of arrival signals
    • 使用主时钟识别位置的方法来同步到达时间信号
    • US06310576B1
    • 2001-10-30
    • US09465572
    • 1999-12-17
    • Mark J. Johnson
    • Mark J. Johnson
    • G01S302
    • H04W64/00
    • A method is provided of identifying position location of a transmitter device, such as a mobile or portable, in an inbound system. The inbound system includes free receivers all coupled, over appropriate radio frequency (RF) links, to a common reference receiver, the latter equipped with a high precision timebase master clock for receiver synchronization purposes. Rather than requiring each and every receiver to maintain a separate high-precision timebase to record position related timing signals for position location determination, in accordance with a preferred embodiment, the free receivers are configured to detect timing signals from the transmitter device, and without timestamping them, quickly forward them (in the form of a signal-received indication) after a fixed or otherwise known time delay to the reference receiver. The reference receiver, in turn, timestamps all signals from all free receivers according to its own master clock high precision timebase. In this way, it is possible to synchronize the forwarded signal-received indications to the reference receiver master clock and to use the results to derive useful position location information. This is achieved without equipping high precision timebase clocks in the free receivers, which in most instances is prohibitively expensive.
    • 提供了一种识别入站系统中诸如移动或便携式的发射机设备的位置的方法。 入站系统包括通过适当的射频(RF)链路耦合到公共参考接收机的免费接收机,后者配备有用于接收机同步目的的高精度时基主时钟。 不是要求每个接收机维持单独的高精度时基以记录位置相关的定位信号以进行位置定位确定。根据优选实施例,自由接收机被配置为检测来自发射机设备的定时信号,并且没有时间戳 他们在固定或以其他方式已知的时间延迟到参考接收机之后,迅速将其(以信号接收指示的形式)转发。 参考接收机又根据其自己的主时钟高精度时基来对来自所有空闲接收机的所有信号进行时间戳。 以这种方式,可以将转发的信号接收指示同步到参考接收机主时钟,并且使用结果来导出有用的位置信息。 这是在没有在自由接收机中配备高精度时基时钟的情况下实现的,在大多数情况下,它们是非常昂贵的。
    • 20. 发明授权
    • Liquid crystal display device including multiple ambient light
illumination modes with switchable holographic optical element
    • 液晶显示装置包括具有可切换全息光学元件的多个环境光照明模式
    • US5745203A
    • 1998-04-28
    • US623092
    • 1996-03-28
    • George T. ValliathKevin W. JelleyAlan G. ChenMark J. Johnson
    • George T. ValliathKevin W. JelleyAlan G. ChenMark J. Johnson
    • G02B5/32G02F1/1335G02F1/13
    • G02F1/133553G02B5/32
    • A liquid crystal display device (10) for forming a display includes a liquid crystal panel (12), a switchable holographic optical element (14), and a reflective holographic optical element (16). Ambient light illuminates a front polarizer (18), which polarizes the ambient light and transmits the polarized light to the liquid crystal cell (20). The liquid crystal cell (20) receives the polarized light and transmits polarized light derived from the incident polarized light to a back polarizer (22). The back polarizer (22) polarizes the light and transmits the light to the switchable holographic optical element (14). While in a first mode, the switchable holographic optical element (14) redirects the light back toward the liquid crystal panel (12) within a first viewing cone (34) to form the display. In a second mode, the switchable holographic optical element (14) is transparent and transmits the light to the reflective holographic optical element (16). The reflective holographic optical element (16) redirects the light back toward the liquid crystal panel (12) in a second viewing cone (36) to form the display. The second viewing cone (36) is preferably narrower than the first viewing cone (34), which increases the intensity of the light within the second viewing cone (36).
    • 用于形成显示器的液晶显示装置(10)包括液晶面板(12),可切换全息光学元件(14)和反射型全息光学元件(16)。 环境光照射前偏振器(18),其使环境光偏振并将偏振光透射到液晶单元(20)。 液晶单元(20)接收偏振光并将从入射偏振光导出的偏振光透射到背偏振器(22)。 后偏振器(22)使光偏振,并将光透射到可切换全息光学元件(14)。 在第一模式中,可切换全息光学元件(14)使第一观察锥体(34)内的光朝向液晶面板(12)重定向以形成显示器。 在第二模式中,可切换全息光学元件(14)是透明的并将光透射到反射全息光学元件(16)。 反射全息光学元件(16)将光在第二观察锥(36)中朝向液晶面板(12)重定向以形成显示器。 第二观察锥体(36)优选地比第一观察锥体(34)更窄,这增加了第二观察锥体(36)内的光的强度。