Dimming glass process

Hello everyone, I'm Xiaobian. Today, I will introduce dimming glass to you. The following content is organized by Xiaobian for reference.

Dimming glass

⑴. Atomization state of STG

The dimming film is composed of a plastic-liquid crystal core layer sandwiched between two transparent conductive films. The plastic-liquid crystal core layer includes liquid crystal spheres and polymers. The director of the liquid crystal molecules is approximately parallel to the glass substrate, and the polymer surrounds the liquid crystal micro- drip around. The refractive index of the polymer is nP, which is similar to the refractive index of glass, about 1.5, and is an isotropic substance; the extraordinary light refractive index and the ordinary light refractive index of the liquid crystal are respectively ne and no. When the normal incident visible light passes through When the glass and transparent conductive film are incident on the interface between the liquid crystal sphere and the polymer, since ne is not equal to nP, scattering occurs and the STG is in a hazy state.

⑵. STG transparent

When an external electric field is applied, an electric field is formed between the two transparent conductive films, and the directors of the liquid crystal molecules are arranged along the direction of the electric field. When the vertically incident visible light passes through the glass and the transparent conductive film and then enters the interface between the liquid crystal sphere and the polymer, due to the no direction It is perpendicular to the light propagation direction, and no is equal to nP, so it is transmitted, and the dimming glass is transparent at this time.

⑶. STG Haze

The main indicator to characterize the optical performance of dimming glass is transparency, which is actually haze. The smaller the haze when the power is on, the better, and the greater the haze when the power is off. When an external electric field is applied, the light is incident perpendicular to the direction of the transparent conductive film. , although nLC is approximately equal to no, due to the difference between the values of nP and no, scattering still occurs at the interface between the liquid crystal droplet and the polymer, which is the main cause of haze.

⑷. perspective

When the dimming film is energized and the angle between the incident light and the vertical direction of the dimming film (called viewing angle α) is not zero, the propagation direction of the light in the STF is not parallel to the director of the liquid crystal molecules.

At the interface between the liquid crystal droplet and the polymer, the component of light vibrating in the ne direction is scattered. When a is larger, the scattering is also more, so the haze increases with the increase of viewing angle, which is the characteristic of the photoelectric effect of liquid crystal.

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