New technologies for advanced LCD‐TV performance

Kim, Sang Soo; Berkeley, Brian H.; Kim, Kyeong‐Hyeon; Song, Jinwoo

doi:10.1889/1.1847732

Cited by 84 publications

(37 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, color wash-out in off-axis observation needed to be addressed. Th e super PVA (S-PVA) mode, a mode with eight sub-domains, was suggested in response to this need ( Figure 3) [29]. Each pixel in an S-PVA panel is composed of two subpixels, each with four domains.…”

Section: Review Articlementioning

confidence: 99%

See 1 more Smart Citation

Technical evolution of liquid crystal displays

2009

Self Cite

View full text Add to dashboard Cite

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...

show abstract

Section: Review Articlementioning

confidence: 99%

“…Th e contrast ratio for LCDs, defi ned as the ratio of white luminance to black luminance, is one of the most important factors contributing to clear and vivid image quality [29]. For example, when watching a movie on a home display, black luminance greater than 0.1-0.2 Cd/m 2 can deteriorate the perceived quality of dark images.…”

Section: Contrast Ratiomentioning

confidence: 99%

Technical evolution of liquid crystal displays

2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, retardation of the LC layer causes a color shift as the viewing angle changes from normal to oblique [17]. As a result, the viewing-angle property was further improved by dividing each pixel into two regions, to produce different voltages, which can give rise to different LC behavior in each region [18][19][20][21][22]. According to the driving method, the 8-domain mode can be classified according to many types:, including the capacitor-coupling type (C-C Type), which can generate different voltages for each domain by adding a capacitor [23], and the two-transistor type (T-T Type), which independently controls the voltages in desired regions [21,24].…”

Section: Introductionmentioning

confidence: 99%

Reduction of Gamma Distortion in Oblique Viewing Directions in Polymer-stabilized Vertical Alignment Liquid Crystal Mode

김효중¹,

Lim²,

Murali³

et al. 2017

Current Optics and Photonics

View full text Add to dashboard Cite

In large liquid crystal displays, the image quality in an oblique viewing direction is a crucial issue. From this perspective, 8-domain polymer-stabilized vertical alignment (PS-VA) mode has been developed to suppress the color shift in oblique viewing directions, compared to that in 4-domain PS-VA mode. To realize the 8-domain PS-VA, the four domains in a pixel are each divided into two regions, such that applying different electric potentials result in different tilt angles in these two regions, while keeping four azimuthal directions in each domain. However, applying different voltages in a pixel causes drawbacks, such as requiring additional processes to construct a capacitor and a transistor, which will further reduce the aperture ratio. Here we propose a different approach to form the 8-domain, by controlling surface polar anchoring energy and the width of patterned electrodes in two regions of a pixel. As a result, the gamma-distortion index (GDI), measured at an azimuthal angle of 0°, is reduced by about 23% and 8%, compared to that of a conventional 4-domain at polar angles of 30° and 60° respectively.

show abstract

“…Meanwhile, several LCD modes have also been highly developed for commercialization and they can be distinguished by a ground state of LC and an electrode structure, such as twisted nematic (TN) [1], vertical alignment (VA) [2][3][4][5][6][7][8][9], in-plane switching (IPS) [10,11] and fringe field switching (FFS) modes [12][13][14][15]. Among them, advantages of the VA mode are rubbing-free, an excellent dark state at normal view, and wide viewing angle.…”

Section: Introductionmentioning

confidence: 99%

“…Herein, due to the wide viewing, the LC reorientation needs to be in multi-directions. 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.…”

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

View full text Add to dashboard Cite

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.

show abstract

New technologies for advanced LCD‐TV performance

Cited by 84 publications

References 4 publications

Technical evolution of liquid crystal displays

Technical evolution of liquid crystal displays

Reduction of Gamma Distortion in Oblique Viewing Directions in Polymer-stabilized Vertical Alignment Liquid Crystal Mode

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

Contact Info

Product

Resources

About