LCD light-reducing apparatus, and vehicle smart mirror using same

Abstract

The present invention relates to an LCD light-reducing apparatus, and to a vehicle smart mirror using same, which are to be applied to the rear-view mirror or a side-view mirror of a vehicle to protect the vision of the driver of the vehicle from bright lights emitted from behind during nighttime driving and to prevent glare. The LCD light-reducing apparatus according to the present invention comprises an LCD panel including at least one liquid crystal cell, and a power supply device for applying an electric field to the LCD panel. The LCD cell includes a liquid crystal layer, and two substrate layers opposite one another with the liquid crystal layer at the center thereof. The liquid crystal layer is filled with a compound including negative dielectric anisotropic nematic liquid crystals, a chiral material for inducing a cholesteric phase of the nematic liquid crystals to have a pitch of 1 to 4 times the cell gap of the liquid crystal layer, and a dichromatic dye for being rearranged together with the nematic liquid crystals to transmit or absorb light in accordance with whether or not the electric field is applied. The substrate layer includes a vertical alignment layer for arranging the respective nematic liquid crystals and dichromatic dye in a first arrangement that is vertical with respect to the surface of the substrate layer, and an electrode for generating an electric field that passes through the liquid crystal layer to rearrange the nematic liquid crystals and dichromatic dye in a second arrangement that is different from the first arrangement.

Description

technical field [0001] The present invention relates to an LCD light attenuation device used in a smart mirror for vehicles, and more specifically, relates to an LCD light attenuation device as described below and a smart mirror for a vehicle using the device, in order to protect the driving of the vehicle when driving at night The eyesight of the occupant is not affected by the strong light from the rear and prevents glare, and it is applied in the rearview mirror or sideview mirror of the vehicle. Background technique [0002] In general, light attenuating devices are widely used in ski goggles, sunglasses, vehicle smart mirrors for preventing glare of vehicle drivers, light transmittance adjustment windows, and the like. In sunglasses or ski goggles, photo-chromic materials are mainly used to realize light attenuation devices. Although this has the advantage of simple application of photo-chromic materials, it is difficult to use in vehicles due to the slow reaction speed...

AI Technical Summary

Problems solved by technology

However, in order to form the 1 / 4 wavelength polymer liquid crystal film in the cell, a more complicated process is required, and there is a problem that the light absorption rate is not constant depending on the polarization direction of the incident light.

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