Transflective liquid crystal display device with dual liquid crystal layer thickness and particular half wave plate angle
First Claim
Patent Images
1. A transflective liquid crystal display (LCD) device, comprising:
- first and second substrates facing and spaced apart from each other;
a first polarizer formed under the first substrate;
a half wave plate and a second polarizer that are formed in series on the second substrate;
a backlight device being adjacent to the first polarizer;
a common electrode on a surface of the second substrate facing the first substrate;
a pixel electrode formed on the first substrate and corresponding to each pixel, the pixel electrode is divided into a transmissive portion and a reflective portion;
a liquid crystal layer interposed between the first and second substrates, wherein a thickness of the liquid crystal layer between the common electrode and the transmissive portion of the pixel electrode is more than 1.5 and less than 2.5 times larger than a thickness of the liquid crystal layer between the common electrode and the reflective portion of the pixel electrode; and
, within a range of about 10 degrees to 17.5 degrees wherein a slow axis of the half wave plate is disposed at an angle “
θ
”
from a transmissive axis of the second polarizer; and
wherein a transmissive axis of the first polarizer is disposed at the angle “
2θ
”
from the transmissive axis of the second polarizer.
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Abstract
A transflective LCD device improves a light transmittance in both the transmissive mode and the reflective mode and improves efficiency in the use of the light regardless of wavelength. To properly control the ON/OFF-switch of the blue wavelength band or the red wavelength band, the transflective LCD device adopts a half wave plate (λ/2) and changes the optic axes of the polarizers and the retardation film.
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Citations
14 Claims
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1. A transflective liquid crystal display (LCD) device, comprising:
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first and second substrates facing and spaced apart from each other;
a first polarizer formed under the first substrate;
a half wave plate and a second polarizer that are formed in series on the second substrate;
a backlight device being adjacent to the first polarizer;
a common electrode on a surface of the second substrate facing the first substrate;
a pixel electrode formed on the first substrate and corresponding to each pixel, the pixel electrode is divided into a transmissive portion and a reflective portion;
a liquid crystal layer interposed between the first and second substrates, wherein a thickness of the liquid crystal layer between the common electrode and the transmissive portion of the pixel electrode is more than 1.5 and less than 2.5 times larger than a thickness of the liquid crystal layer between the common electrode and the reflective portion of the pixel electrode; and
, within a range of about 10 degrees to 17.5 degreeswherein a slow axis of the half wave plate is disposed at an angle “
θ
”
from a transmissive axis of the second polarizer; and
wherein a transmissive axis of the first polarizer is disposed at the angle “
2θ
”
from the transmissive axis of the second polarizer.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification
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Current AssigneeLG Display Co., Ltd.
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Original AssigneeLG Philips LCD Company Limited (LG Display Co., Ltd.)
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InventorsBaek, Heum-II
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Primary Examiner(s)Kim, Robert H.
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Assistant Examiner(s)Rude, Timothy L
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Application NumberUS09/835,849Publication NumberTime in Patent Office861 DaysField of Search349/76, 349/117, 349/119, 349/121, 349/114US Class Current349/117CPC Class CodesG02F 1/133371 Cells with varying thicknes...G02F 1/133555 TransflectorsG02F 1/133638 Waveplates, i.e. plates wit...
