Transflective liquid crystal display and method of fabricating the same
First Claim
Patent Images
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;
a liquid crystal layer interposed between the upper and lower substrates, wherein the liquid crystal layer has a first adjusted thickness to compensate an residual optical retardation of incident light caused by anchored liquid crystals near an alignment layer when a maximum operation voltage is applied;
an upper quarter wave plate (QWP) on the upper substrate, wherein the upper quarter wave plate has a second adjusted thickness to compensate the residual optical retardation caused by the liquid crystal layer when the maximum operation voltage is applied;
an upper polarizer on the upper quarter wave plate;
a transparent common electrode on a surface of the upper substrate facing into the lower substrate;
a pixel electrode over a first surface of the lower substrate, wherein the pixel electrode corresponds to each pixel region, and the pixel electrode is divided into transparent and reflective portions;
a lower quarter wave plate (QWP) on a second surface of the lower substrate;
a lower polarizer below the lower quarter wave plate; and
a backlight device arranged to be adjacent to the lower polarizer.
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Abstract
The invention relates to a transflective liquid crystal display device that has a high contrast ratio. The transflective liquid crystal panel includes a homogeneous liquid crystal such that the transflective liquid crystal display device will have an optical retardation when the voltage is applied. Therefore, in order to compensate the optical retardation caused by this liquid crystal, a thickness of the liquid crystal layer is adjusted. Moreover, a thickness of the retardation film is also adjusted. Accordingly, the complete dark state and the high contrast ratio are achieved in the liquid crystal display.
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Citations
39 Claims
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1. A transflective liquid crystal display, comprising:
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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;
a liquid crystal layer interposed between the upper and lower substrates, wherein the liquid crystal layer has a first adjusted thickness to compensate an residual optical retardation of incident light caused by anchored liquid crystals near an alignment layer when a maximum operation voltage is applied;
an upper quarter wave plate (QWP) on the upper substrate, wherein the upper quarter wave plate has a second adjusted thickness to compensate the residual optical retardation caused by the liquid crystal layer when the maximum operation voltage is applied;
an upper polarizer on the upper quarter wave plate;
a transparent common electrode on a surface of the upper substrate facing into the lower substrate;
a pixel electrode over a first surface of the lower substrate, wherein the pixel electrode corresponds to each pixel region, and the pixel electrode is divided into transparent and reflective portions;
a lower quarter wave plate (QWP) on a second surface of the lower substrate;
a lower polarizer below the lower quarter wave plate; and
a backlight device arranged to be adjacent to the lower polarizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. The transflective liquid crystal display, comprising:
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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;
a liquid crystal layer interposed between the upper and lower substrates, wherein the liquid crystal layer has a first adjusted thickness to compensate a residual optical retardation of incident light caused by anchored liquid crystals near an alignment layer when a maximum operation voltage is applied;
a first upper retardation film over the upper substrate;
a second upper retardation film between the first upper retardation film and the upper substrate, wherein the second upper retardation film has a second adjusted thickness of compensating an optical retardation caused by the liquid crystal layer;
an upper polarizer on the first upper retardation film;
a transparent common electrode on a surface of the upper substrate facing into the lower substrate;
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;
a second lower retardation film on the other surface of the lower substrate, wherein the second lower retardation film has a third adjusted thickness to compensate a residual optical retardation caused by the liquid crystal layer when a maximum operation voltage is applied;
a first lower retardation film under the second lower retardation film;
a lower polarizer under the first lower retardation film; and
a backlight device arranged adjacent to the lower polarizer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A transflective liquid crystal display, comprising:
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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
, α
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. - View Dependent Claims (30, 31, 32, 33)
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34. A transflective liquid crystal display, comprising:
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upper and lower substrates facing 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 half wave plate (HWP) on the upper QWP;
an upper polarizer on the upper HWP;
a lower quarter wave plate (QWP) below the lower substrate;
a lower half wave plate (HWP) below the lower QWP;
a lower polarizer beolw the lower HWP;
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, a slow axis of the upper HWP is perpendicular to a slow axis of the lower HWP, an optical retardation of the upper QWP is λ
/4+α
, α
ranges from zero to 100 nm, the slow axis of the lower QWP is parallel with an orientation direction of the liquid crystal display layer, an optical retardation of the lower QWP is λ
/4−
β
, and β
ranges from zero to 100 nm. - View Dependent Claims (35, 36, 37, 38, 39)
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Specification