Abstract
A transmittance-control device requires a high transmittance difference between its transparent and opaque states. In this paper, we propose a systematic approach to find the condition for the maximum transmittance difference in a guest-host liquid crystal (GHLC) cell. To this end, we calculated the transmittance difference as we varied the cell gap and dye concentration. The transmittance of a GHLC cell is dependent on the alignment of dye molecules, cell gap, and dye concentration. We used a constant-transmittance contour map to find the condition for the desired transmittance of LC cells in each state and the transmittance difference of each LC mode. We experimentally confirmed that the design of a GHLC cell with the desired performance could be achieved through the proposed design process.
Highlights
Transmittance-control devices allow users to control the intensity of transmitted light through the absorption of incident light
We present a systematic approach to finding the condition for the desired transmittance difference in a guest-host liquid crystal (GHLC) device
Our results show that a cholesteric LC (ChLC) cell has a higher transmittance difference than an electrically controlled birefringence (ECB) cell, we should note that the choice of the liquid crystal (LC) mode higher transmittance difference than an ECB cell, we should note that the choice of the LC mode depends on the application
Summary
Transmittance-control devices allow users to control the intensity of transmitted light through the absorption of incident light. ECD and SPD have been widely used because of their low transmittance in the opaque state They have been studied extensively, they are not able to demonstrate color neutrality, adequate durability, a low manufacturing cost, and a fast switching speed at the same time, which limits their practical application. Crystals 2019, 9, 63 to find the condition that gives the maximum transmittance difference between the transparent and opaque states while satisfying the desired performance, such as the response time and driving voltage, and without the solubility issue. We can determine the conditions of the cell gap and dye concentration with the desired performance, such as the transmittance in the transparent state, transmittance difference, driving voltage, and response time. We expect that the proposed approach will offer an effective method for the fabrication of a GHLC cell that can be used to control transmittance
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