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    • 9. 发明申请
    • THERMALLY TUNABLE LIQUID CRYSTAL BASED OPTICAL CORRECTING ELEMENT FOR A DISPLAY
    • 用于显示器的基于液晶的基于液晶的光学校正元件
    • WO2008017316A1
    • 2008-02-14
    • PCT/EP2006/007830
    • 2006-08-08
    • GM GLOBAL TECHNOLOGY OPERATIONS, INC.BRANDT, PeterCHARLE, HeikoSAHLBOM, DanielSTRINGFELLOW, Steven, A.
    • BRANDT, PeterCHARLE, HeikoSAHLBOM, DanielSTRINGFELLOW, Steven, A.
    • G02F1/133G02F1/29
    • G02B27/01G02B2027/0112G02B2027/0118G02F1/133382G02F1/29G02F2203/18G09G3/18G09G2320/041
    • A thermally tunable liquid crystal cell (15,17,18) functions as an optical correcting element for a display system. The optical correction element acts as a switchable lens or mirror for a display system (such as a head-up display on a car windscreen or a projection display). Thermal tuning of the element allows for the adjustment of the virtual image of a flat panel display in response to changes in environmental factors (e.g. temperature or viewing distance). The liquid crystal cell comprises electrode layers (13, 14, 16) arranged on either side of a liquid crystal layer (15). At least one of the highly resistive transparent cell control electrodes (14) also acts as a heater, either simultaneously with the operation of the cell or when this is switched off. In operation, the electrode resistance distribution causes a parabolic variation in the electric field applied to the liquid crystal layer which then produces a corresponding variation in the liquid crystal refractive index profile. In this way, the element provides a phase change distribution over the cell for light passing through it. Instead of a single unpatterned control electrode, an array of pixels can be individually addressed. A temperature sensor in the cell (100) measures the temperature of the liquid crystal layer and a comparator (101) determines the amount of heating required so that the liquid crystal layer temperature is above a certain minimum operating temperature or can be switched with a faster response time. A voltage source (U3) is connected across the high resistance electrodes to provide the heater power supply.
    • 热可调液晶单元(15,17,18)用作显示系统的光学校正元件。 光学校正元件用作显示系统的可切换透镜或镜子(例如汽车挡风玻璃或投影显示器上的平视显示器)。 元件的热调谐允许响应于环境因素(例如温度或观看距离)的变化来调整平板显示器的虚拟图像。 液晶单元包括布置在液晶层(15)两侧的电极层(13,14,16)。 高电阻透明单元控制电极(14)中的至少一个也可以与电池的操作同时或当关闭时充当加热器。 在操作中,电极电阻分布导致施加到液晶层的电场中的抛物线变化,然后产生相应的液晶折射率分布变化。 以这种方式,该元件提供细胞上的光通过它的相变分布。 代替单个未图案化的控制电极,可以单独寻址像素阵列。 电池(100)中的温度传感器测量液晶层的温度,比较器(101)确定所需的加热量,使得液晶层温度高于某一最低工作温度,或者可以以更快的速度切换 响应时间。 电压源(U3)跨越高电阻电极连接以提供加热器电源。