| US 7,589,805 B2 | ||
| Transflective liquid crystal display and method of fabricating the same | ||
| Heum-Il Baek, Seoul (Korea, Republic of) | ||
| Assigned to LG Display Co., Ltd., Seoul (Korea, Republic of) | ||
| Filed on May 25, 2005, as Appl. No. 11/136,415. | ||
| Application 11/136415 is a division of application No. 10/694217, filed on Oct. 28, 2003, granted, now 6,917,404. | ||
| Application 10/694217 is a division of application No. 09/850186, filed on May 08, 2001, granted, now 6,657,689. | ||
| Claims priority of application No. 2000-24471 (KR), filed on May 08, 2000. | ||
| Prior Publication US 2005/0213006 A1, Sep. 29, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G02F 1/1335 (2006.01) | ||
| U.S. Cl. 349—114 [349/102; 349/119] | 3 Claims |
| 1. A transflective liquid crystal display, comprising:
upper and lower substrates facing into and spaced apart from each other, wherein the upper and lower substrates include a
plurality of pixel regions that display images;
an upper quarter wave plate (QWP) on the upper substrate;
an upper polarizer on the upper quarter wave plate;
a lower quarter wave plate (QWP) below the lower substrate;
a lower polarizer below the lower quarter wave plate;
a backlight device arranged to be adjacent to the lower polarizer;
a liquid crystal layer interposed between the upper and lower substrates;
a transparent common electrode on a surface of the upper substrate facing into the lower substrate;
an upper alignment layer between the transparent common electrode and the liquid crystal layer;
a pixel electrode over the lower substrate, wherein the pixel electrode corresponds to each pixel region, and the pixel electrode
is divided into transparent and reflective portions; and
a lower alignment layer between the pixel electrode and the liquid crystal layer;
wherein a transmissive axis of the upper polarizer is perpendicular to a transmissive axis of the lower polarizer, a slow
axis of the upper QWP is perpendicular to a slow axis of the lower QWP, the slow axis of the upper QWP forms an angle of 45°
with the transmissive axis of the upper polarizer, an optical retardation of the upper QWP is λ/4+α, and an optical retardation
of the liquid crystal layer is λ/4+α in the reflective portion so that the upper QWP has the same optical retardation as the
liquid crystal layer in the reflective portion, ranges from zero to 100 nm, and the slow axis of the lower QWP is parallel
to an orientation direction of the liquid crystal display layer, and
wherein the liquid crystal layer has an adjusted thickness, and wherein the adjusted thickness is d+d1, where d is a normal thickness of the liquid crystal layer and d1 is calculated using the following equation,
 where T is a value of transmittance when a maximum operation voltage is applied, φ is an angle between an optical axis of
the liquid crystal layer and a transmissive axis of the polarizer, Δn is a birefringence of the liquid crystal layer.
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