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Realization of Multi-Stable Ground States in a Nematic Liquid Crystal by Surface and Electric Field Modification.

Gwag JS, Kim YK, Lee CH, Kim JH - Sci Rep (2015)

Bottom Line: Because of a growing market demand on such devices, the LCD that can be of numerous surface alignments of directors as its ground state, the so-called multi-stable LCD, comes into the limelight due to the great potential for low power consumption.We demonstrate experimentally and theoretically that a battery of stable surface alignments can be achieved by the field-induced surface dragging effect on an aligning layer with a weak surface anchoring.The simplicity and stability of the proposed system suggest that it is suitable for the multi-stable LCDs to display static images with low power consumption and thus opens applications in various fields.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Yeungnam University, Gyeongsan 712-749, Korea.

ABSTRACT
Owing to the significant price drop of liquid crystal displays (LCDs) and the efforts to save natural resources, LCDs are even replacing paper to display static images such as price tags and advertising boards. Because of a growing market demand on such devices, the LCD that can be of numerous surface alignments of directors as its ground state, the so-called multi-stable LCD, comes into the limelight due to the great potential for low power consumption. However, the multi-stable LCD with industrial feasibility has not yet been successfully performed. In this paper, we propose a simple and novel configuration for the multi-stable LCD. We demonstrate experimentally and theoretically that a battery of stable surface alignments can be achieved by the field-induced surface dragging effect on an aligning layer with a weak surface anchoring. The simplicity and stability of the proposed system suggest that it is suitable for the multi-stable LCDs to display static images with low power consumption and thus opens applications in various fields.

No MeSH data available.


Related in: MedlinePlus

POM textures of the numerous ground states produced in a proposed LC cell.Each of the ground state is achieved by removing an electric field at T = 45 °C after E = 10 V/μm was applied on two groups of electrodes GE1 and GE2 (denoted above and under the arrows) at . The electrodes A (blue line in Fig. 2a) and B (red line in Fig. 2a) are on a bottom substrate, and the electrodes C (yellow line in Fig. 2a) and D (green line in Fig. 2a) are on a top substrate. More possible ground states are shown in the Supplementary Information (Supplementary Figure S1).
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f2: POM textures of the numerous ground states produced in a proposed LC cell.Each of the ground state is achieved by removing an electric field at T = 45 °C after E = 10 V/μm was applied on two groups of electrodes GE1 and GE2 (denoted above and under the arrows) at . The electrodes A (blue line in Fig. 2a) and B (red line in Fig. 2a) are on a bottom substrate, and the electrodes C (yellow line in Fig. 2a) and D (green line in Fig. 2a) are on a top substrate. More possible ground states are shown in the Supplementary Information (Supplementary Figure S1).

Mentions: Figure 2 shows the POM textures of numerous ground states resulting from the various combinations of E in a single LC cell. When the LC is injected into the cell, the cell initially exhibits a Schlieren texture as a ground state, Fig. 2 (a). In contrast to normal LC cells with a polyimide aligning layer, the proposed cell can transform its ground state from the Schlieren texture. For instance, the Schlieren texture (Fig. 2a) can be converted into the ground state shown in Fig. 2b as the alternating current (AC) E = 10 V/μm (sinusoidal wave of frequency f = 1 kHz) is introduced on the two groups of selected electrodes, GE1 (electrodes A and C) and GE2 (electrodes B and D), at followed by removal of the field at T = 45 °C; the critical field E* to realign surface directors is smaller than 10 V/μm at T > 95 °C. With numerous combinations of electric fields, more than 20 different ground states could be derived from the initial ground state, Fig. 2b (see also Supplementary Figure S1 a1-a20). Each of the newly achieved ground state is stable as long as the cell is operating at E < E* and .


Realization of Multi-Stable Ground States in a Nematic Liquid Crystal by Surface and Electric Field Modification.

Gwag JS, Kim YK, Lee CH, Kim JH - Sci Rep (2015)

POM textures of the numerous ground states produced in a proposed LC cell.Each of the ground state is achieved by removing an electric field at T = 45 °C after E = 10 V/μm was applied on two groups of electrodes GE1 and GE2 (denoted above and under the arrows) at . The electrodes A (blue line in Fig. 2a) and B (red line in Fig. 2a) are on a bottom substrate, and the electrodes C (yellow line in Fig. 2a) and D (green line in Fig. 2a) are on a top substrate. More possible ground states are shown in the Supplementary Information (Supplementary Figure S1).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4477365&req=5

f2: POM textures of the numerous ground states produced in a proposed LC cell.Each of the ground state is achieved by removing an electric field at T = 45 °C after E = 10 V/μm was applied on two groups of electrodes GE1 and GE2 (denoted above and under the arrows) at . The electrodes A (blue line in Fig. 2a) and B (red line in Fig. 2a) are on a bottom substrate, and the electrodes C (yellow line in Fig. 2a) and D (green line in Fig. 2a) are on a top substrate. More possible ground states are shown in the Supplementary Information (Supplementary Figure S1).
Mentions: Figure 2 shows the POM textures of numerous ground states resulting from the various combinations of E in a single LC cell. When the LC is injected into the cell, the cell initially exhibits a Schlieren texture as a ground state, Fig. 2 (a). In contrast to normal LC cells with a polyimide aligning layer, the proposed cell can transform its ground state from the Schlieren texture. For instance, the Schlieren texture (Fig. 2a) can be converted into the ground state shown in Fig. 2b as the alternating current (AC) E = 10 V/μm (sinusoidal wave of frequency f = 1 kHz) is introduced on the two groups of selected electrodes, GE1 (electrodes A and C) and GE2 (electrodes B and D), at followed by removal of the field at T = 45 °C; the critical field E* to realign surface directors is smaller than 10 V/μm at T > 95 °C. With numerous combinations of electric fields, more than 20 different ground states could be derived from the initial ground state, Fig. 2b (see also Supplementary Figure S1 a1-a20). Each of the newly achieved ground state is stable as long as the cell is operating at E < E* and .

Bottom Line: Because of a growing market demand on such devices, the LCD that can be of numerous surface alignments of directors as its ground state, the so-called multi-stable LCD, comes into the limelight due to the great potential for low power consumption.We demonstrate experimentally and theoretically that a battery of stable surface alignments can be achieved by the field-induced surface dragging effect on an aligning layer with a weak surface anchoring.The simplicity and stability of the proposed system suggest that it is suitable for the multi-stable LCDs to display static images with low power consumption and thus opens applications in various fields.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Yeungnam University, Gyeongsan 712-749, Korea.

ABSTRACT
Owing to the significant price drop of liquid crystal displays (LCDs) and the efforts to save natural resources, LCDs are even replacing paper to display static images such as price tags and advertising boards. Because of a growing market demand on such devices, the LCD that can be of numerous surface alignments of directors as its ground state, the so-called multi-stable LCD, comes into the limelight due to the great potential for low power consumption. However, the multi-stable LCD with industrial feasibility has not yet been successfully performed. In this paper, we propose a simple and novel configuration for the multi-stable LCD. We demonstrate experimentally and theoretically that a battery of stable surface alignments can be achieved by the field-induced surface dragging effect on an aligning layer with a weak surface anchoring. The simplicity and stability of the proposed system suggest that it is suitable for the multi-stable LCDs to display static images with low power consumption and thus opens applications in various fields.

No MeSH data available.


Related in: MedlinePlus