Blue-phase liquid crystal display with insulating protrusion

Guo, Yuqiang; Wang, Yifei; Zhang, Chi; Mu, Qihui; Li, Xiaoshuai; Sun, Yubao; Dou, Hu; Wang, Qiong‐Hua

doi:10.1080/02678292.2018.1456570

Cited by 9 publications

(4 citation statements)

References 37 publications

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“…At last, we apply the intercepting transmittance method to some proposed electrode structures, such as S-shape protrusion (I) [4], penetration (II) [24,71,72] and insulating protrusion with high dielectric constant (III) [21,22] electrode structures. In order to make a fair comparison, the parameters of BPLC and electrodes are reset compared with the referenced electrode structures.…”

Section: Application In Some Proposed Electrode Structuresmentioning

confidence: 99%

“…In terms of BPLC materials, it has been proved that BPLC materials with a large Kerr constant exhibit low operating voltage [17,18]. On the other hand, some optimized electrode structures with thicker horizontal electric field were put forward, such as protrusion electrodes [19][20][21][22][23], penetrating electrodes [24,25], dual-side electrodes [26] and special-shaped electrodes [27,28]. Usually, low-voltage and high-transmittance IPS-BPLCD can be achieved by combining high performance BPLC materials with optimized electrode structures.…”

Section: Introductionmentioning

confidence: 99%

“…But, the obvious disadvantage of main/sub-pixel electrode structure is that there should be two driving circuits to separately drive two pixels. Among these methods, a zigzag multi-domain electrode structure is usually used to lower gamma shift [4,14,22,25]. However, when the dead zone at turning corners of the zigzag electrode structure decreases the overall transmittance of LCD, the corresponding black matrix will be complex [50].…”

Section: Introductionmentioning

confidence: 99%

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Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Guo

et al. 2020

J. Phys. D: Appl. Phys.

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Generally, the brightness and color of one image on a large-area flat panel display are different when people watch a display image under different viewing angles. The gamma shift is used to evaluate the difference of electro-optical performances under different viewing angles, namely the gray-scale display distortion. In order to reduce the gamma shift under the oblique viewing angle, the intercepting transmittance method is proposed and illustrated based on the single-domain in-plane switching blue-phase liquid crystal display (IPS-BPLCD). The results show that the off-axis image distortion index (the quantitative evaluation index of gamma shift) can be reduced by ~72% if the transmittance ratio reduces from 100% to 80% for the IPS-BPLCD with a straight electrode structure. Moreover, the zigzag electrode structure is used as the reference to illustrate the merits of the proposed method. As a result, the operating voltage of the IPS-BPLCD can be reduced by >20%, and the off-axis image distortion index is reduced by ~47% compared with the zigzag electrode structure. Besides this, the effects of the proposed method on contrast ratio, operating voltage and color difference of IPS-BPLCD are investigated as well. In fact, the proposed method is also useful for other LCD modes and electro-optical devices to achieve wide and uniform viewing angles.

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Section: Application In Some Proposed Electrode Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Guo

et al. 2020

J. Phys. D: Appl. Phys.

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“…For example, poly vinlidene fluoridetrifluoroethylene-chlorotrifluoroethylene P (VDF-TrFE-CTFE:62:26:12 mol-%) and volume concentration (0.23) of polyaniline have very high dielectric constant (more than 2000 at 100 Hz), and these materials are all transparent. [34][35][36][37][38] With the isolation effect of the dielectric layer, a nonuniform electric potential from the T region to the R region is generated between the double layer pixel electrodes and the common electrode, and the electric potential in the T region are stronger than that in the R region at the voltage on state, as shown in Figure 2, where d = 7 μm, ε = 3.8, h = 7 μm, w = 10 μm, and V on = 10V rms . The electric potential distribution of the T and R regions are indicated by dotted and solid lines, respectively.…”

Section: Device Structure and Principlementioning

confidence: 99%

Simulation study of single‐cell‐gap transflective liquid crystal display with nonuniform potential

et al. 2019

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A single‐cell‐gap transflective liquid crystal display with a nonuniform electric potential is demonstrated. The top substrate has a top planar common electrode, a transparent dielectric layer with a general dielectric constant is coated on the bottom substrate, and two planar pixel electrodes with the same size are coated on the dielectric layer and the bottom substrate, respectively. With the different gaps between the two planar pixel electrodes and top planar pixel electrode, the nonuniform electric potential from the transmissive region (T region) to the reflective region (R region) is generated, while a bumpy reflector is coated under the bottom substrate. In this device, with the dielectric layer, the pixel and common electrodes generate a strong electric potential in the T region and a relatively weak electric potential in the R region. Consequently, the T and R regions accumulate the same optical phase retardation. The simulation results show that the display exhibits reasonably low operating voltage, high optical efficiency, and well‐matched voltage‐dependent transmittance and reflectance curves. Besides, the fabrication process and the driving mode of the transflective liquid crystal display are relatively simple, and it is suitable for mobile applications.

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