Stabilization of the liquid crystal director in the patterned vertical alignment mode through formation of pretilt angle by reactive mesogen

Kim, Sang Gyun; Kim, Sung Min; Kim, Youn Sik; Lee, Hee Kyu; Lee, Seung Hee; Lee, Gi‐Dong; Lyu, Jae‐Jin; Kim, Kyeong Hyeon

doi:10.1063/1.2752105

Cited by 190 publications

(98 citation statements)

References 10 publications

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“…Th is has diminished the transmittance advantage of the VA mode over the IPS mode. To improve the transmittance of the VA mode, highaperture-ratio structures using a 'color filter on array' process, and the polymer-stabilized VA mode have been developed [48,49]. In the former technology, the color fi lter and black matrix layers are placed between the data and pixel electrodes on the TFT substrate.…”

Section: Review Articlementioning

confidence: 99%

“…This structure narrows the linewidth of the black matrix, and also ensures that there is no misalignment between the top and bottom glass layers. Th e latter technology [48,49] eliminates the need for a patterned ITO electrode in constructing the multi-domain pixel structure, thereby increasing the aperture ratio. This is achieved by using liquid crystal containing a small amount of a reactive mesogen.…”

Section: Review Articlementioning

confidence: 99%

“…Another method for suppressing the formation of an unstable texture is the use of an electrode with a fine micro-slit pattern. The molecules tend to align parallel with the micro-slits, suppressing azimuthal movement of the LC molecules [48,49]. Photo-alignment and reactive mesogens are also being developed to induce a pre-tilt angle [50,51].…”

Section: Response Timementioning

confidence: 99%

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Technical evolution of liquid crystal displays

2009

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I n 1888, more than a century ago, the Austrian botanist FriedrichReinitzer discovered an intermediate state of matter between isotropic liquid and lattice-structured crystal [1][2][3]. Th is state, later termed liquid crystal (LC), remained merely a novelty for many years until suitable applications for the technology began to become apparent. From the late 1960s, following the realization that various display applications were possible, the popularity of liquid crystal as a research fi eld expanded rapidly, attracting the interest of many scientists who made fundamental contributions to the technologies that have led to the spectacular success of liquid crystal displays (LCDs) [3][4][5][6][7][8][9][10][11][12][13]. Th e development of the twisted nematic (TN) [4] and supertwisted nematic (STN) [5] cell confi gurations, along with the necessary manufacturing technologies [6][7][8][9], resulted in the birth of the LCD industry in the late 1970s and early 1980s. The subsequent development of thin-film transistor (TFT) technology provided a further boost to the industry in the late 1980s [14,15]. Th e boom was signifi cantly supported by the advancement of material technologies such as the highly reliable manufacturing of liquid crystal base materials, and the development of polymers for the alignment layer, color fi lter materials, and sheet-type polarizers formed from the poly(vinyl alcohol)-iodine complex.In the 1990s, LCDs occupied an important position in the display market primarily through notebook applications, although the cathode ray tube (CRT) continued to dominate the desktop monitor and television markets. Th e plasma display panel (PDP), which appeared in the commercial market in 1997, pioneered the large-area fl at panel display market. It was widely predicted at the time that PDPs would maintain the lead in the large-area display market and that LCDs in small-display information technology (IT) applications would soon be replaced by new technologies such as displays based on organic light-emitting diodes (OLEDs) [16,17]. Such predictions were based on the belief that the LCD technology suff ered from serious limitations in terms of both off -axis image quality and moving picture quality, and also that it had proved diffi cult to obtain reasonable manufacturing yields of large-area TFT panels. However, these predictions, as we now know, turned out to be incorrect. Th e application of LCDs has expanded rapidly in recent years from purely information technology (IT) applications to the television and mobile display markets, and now even to very-large-area digital information displays (DIDs).Interestingly, while LCDs penetrated the traditional territories of other display technologies including CRTs and PDPs, attracting inevitable and heavy competition from these technologies, the most critical competitors were in fact alternative LCD technologies. A range of LCD modes and technologies are now applied in the same areas of application and are compared directly with one another in the market. In applicat...

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Section: Review Articlementioning

confidence: 99%

Section: Review Articlementioning

confidence: 99%

Section: Response Timementioning

confidence: 99%

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Technical evolution of liquid crystal displays

2009

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“…The conventional multi-domain VA (MVA) [2][3][4][5][6] and patterned VA (PVA) [7][8][9] have shortcomings, such as low transmittance and slow rise response time. In order to overcome the slow rise response time of such VA modes, the polymer-stabilized VA (PS-VA) mode [16][17][18][19][20] has recently been proposed, but the low-transmittance issue still persists and furthermore gives rise to a power consumption issue when employed in high resolution LCDs such as ultra-high-definition (UHD) LCDs. In a PS-VA device as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Transmittance Improvement with Reversed Fishbone-Shape Electrode in Vertical Alignment Liquid Crystal Display

Lim¹,

Kim²,

Kim³

et al. 2016

Journal of the Optical Society of Korea

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A polymer-stabilized vertical alignment (PS-VA) mode with fishbone-shaped pixel electrode structure is mainly used in large-sized liquid crystal displays (LCDs) owing to its advantages such as wide viewing angle, good transmittance and fast response time. One drawback of this mode is a main bone electrode, which crosses in the center of a pixel. It causes the transmittance to decrease badly because LCs cannot be reoriented in this region, and thus, it is particularly unfavorable in an ultra-high-definition LCD. Here, we propose an innovative structure with the main bone electrode relocated to the edge area in a pixel, and investigate how this reverse directed fishbone-shaped pixel electrode structure affects electro-optic characteristics. The proposed structure shows enhanced electro-optic performance, such as the higher transmittance and the faster response time than the conventional VA mode with fishbone-shaped pixel electrode structure.

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“…To solve these issues, i.e., to eliminate the disclination and improve the rising speed, Kim et al presented a polymer stabilized PVA (PS-PVA) mode using a reactive mesogen (RM)-doped LC-mixture to produce the proper pretilt of LCs in pixels [10]. In this case, the pretilt was produced from fixation of surface LCs due to the solidification of RM huddled on the surface by UV exposure under an appropriate proper electric field, which gives some slope to the surface LCs.…”

Section: Introductionmentioning

confidence: 99%

Improved Vertically-Aligned Nematic Mode for High Performance Displays

Jhun

Gwag

2014

Journal of the Optical Society of Korea

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This paper presents an improved vertical alignment nematic liquid crystal mode characterized by the protrusions or slits of the top substrate and additional stripe type common electrodes with polarity switching of the bottom substrate to improve multi-domain vertically aligned (MVA) and patterned vertically aligned (PVA) nematic modes. MVA and PVA modes have disadvantages such as an LC disclination in the vicinity of the middle region of electrodes between the top and bottom protrusions in MVA mode or the top and bottom slits in PVA mode. Therefore, the stripe type common electrode generating a horizontal electric field and the protrusion or slit producing some pretilt of liquid crystals (LCs) were used to improve the LC disclination, which influences the transmittance and response speed. The simulation results showed that the proposed VA mode has higher transmittance than the MVA and PVA modes. As a result, the proposed VA mode can improve the response speed and transmittance remarkably, which makes it useful for upgrading the LCD display quality.

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Stabilization of the liquid crystal director in the patterned vertical alignment mode through formation of pretilt angle by reactive mesogen

Cited by 190 publications

References 10 publications

Technical evolution of liquid crystal displays

Technical evolution of liquid crystal displays

Transmittance Improvement with Reversed Fishbone-Shape Electrode in Vertical Alignment Liquid Crystal Display

Improved Vertically-Aligned Nematic Mode for High Performance Displays

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