Horizontal Switching of Double-Cellgap Liquid Crystal Cell for Superachromatic Transflective Display

Lee, Gak Seok; Kim, Jae Chang; Yoon, Tae–Hoon

doi:10.1143/jjap.45.8769

Cited by 8 publications

(8 citation statements)

References 10 publications

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“…However, manufacturing horizontal-modeswitching LCDs requires complicated and expensive fabrication processes. 1,2 Transflective LCDs operating in a single mode and manufactured with a so-called single-cell-gap structure are very desirable to reduce production costs. But they require in-cell retardation layers to prevent image inversion between the reflective and transmissive modes.…”

Section: A Novel Lcd Technology Yields Both High Reflection and Transmentioning

confidence: 99%

Mode switching of liquid crystals improves display performance

Yoon¹

2008

SPIE Newsroom

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A novel LCD technology yields both high reflection and transmission.Mobile display devices such as portable media players, satellite navigators, and laptop computers demand good readability in both indoor and outdoor settings. These stringent constraints make transflective LCDs (displays that are readable under both bright sunlight and low-light situations) a promising technology. In transflective LCDs, each pixel is divided into two parts, one transmissive and the other reflective. The limited suitability of LCDs due to their narrow viewing angles can be overcome by introducing in-plane (IPS) and fringe-field horizontal switching (FFS) modes. However, manufacturing horizontal-modeswitching LCDs requires complicated and expensive fabrication processes. 1,2 Transflective LCDs operating in a single mode and manufactured with a so-called single-cell-gap structure are very desirable to reduce production costs. But they require in-cell retardation layers to prevent image inversion between the reflective and transmissive modes. 1, 2 Moreover, these retarders, too, have a number of significant problems, including increased operating voltage and unreliability of the materials used for their fabrication. A new optical configuration for a transflective IPS LCD was recently reported, 3 which employs a twisted-nematic liquidcrystal (TNLC) cell with a single-cell-gap structure and without in-cell retarders. Although the transmissive-mode viewing angle performance is significantly improved, the resulting reflectivemode display capability is poor, and both modes exhibit different electro-optic characteristics.Here, we propose an optical TNLC cell design for a single-cellgap transflective display in FFS mode (see Figure 1). A systematic manufacturing procedure simultaneously achieves optimal display performance of both reflection and transmission. The wavelength dispersion of the TNLC cell is suppressed effectively by introducing a half-wave plate (HWP), the best conditions for which are found using the Muller-matrix method. High reflectance and transmittance can both be achieved by applying bidirectional electric fields for either mode. The configuration can be used to produce a high-contrast transflective display with a single-cell gap and without in-cell retardation layersThe combination of the front polarizer, an HWP, and a TNLC layer plays the role of a circular polarizer in the reflective mode Continued on next page

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Section: A Novel Lcd Technology Yields Both High Reflection and Transmentioning

confidence: 99%

Mode switching of liquid crystals improves display performance

Yoon¹

2008

SPIE Newsroom

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“…Generally, transflective LCDs are designed with a single-cellgap structure [8,9] or a double-cell-gap structure [10,11]. The fabrication of a pixel structure with different cell gaps is more complex than that with a single cell gap.…”

Section: Optical Design Of Transflective Dual Operating Modementioning

confidence: 99%

P‐188: Optical Configuration of Transflective Liquid Crystal Display for Dynamic and Memory Operating Mode

Jhun¹,

Kim²,

Park³

et al. 2008

Symp Digest of Tech Papers

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We propose an optical configuration of transflective liquid crystal display (LCD), which can be operated not only as a bistable device but also as a monostable one. By using the parameter space diagram (PSD) method, the memory mode and the dynamic mode are optimized for a reflective type and a transmissive type, respectively. We demonstrate excellent optical performance of our transflective dual mode, such as an excellent dark state and high contrast ratio.

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“…With the recent increase in demand for mobile devices such as cellular phones, MP3 players, and digital multimedia broadcasting applications, transflective LCDs have received attention because of their high performance in both outdoor and indoor environments [1][2][3][4][5]. However, dividing each pixel into two parts, a transmissive part and a reflective part, is required for transflective LCDs.…”

Section: Introductionmentioning

confidence: 99%

P‐163: Three‐terminal Dye‐doped LC Device Switchable between Reflective and Transmissive Modes

Kim

Jin

Park

et al. 2011

Symp Digest of Tech Papers

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We propose a three-terminal dye-doped LC device that is switchable between reflective and transmissive modes without image inversion. An additional LC panel or optical components are not needed for the proposed device, differently from conventional mode-switchable LCDs. Compared to the previous dual panel structure consisting of two vertically-aligned LC layers, an enhancement of the transmittance by more than 4% was obtained because there is no increase in the light absorption by an additional LC panel.

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Horizontal Switching of Double-Cellgap Liquid Crystal Cell for Superachromatic Transflective Display

Cited by 8 publications

References 10 publications

Mode switching of liquid crystals improves display performance

Mode switching of liquid crystals improves display performance

P‐188: Optical Configuration of Transflective Liquid Crystal Display for Dynamic and Memory Operating Mode

P‐163: Three‐terminal Dye‐doped LC Device Switchable between Reflective and Transmissive Modes

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