Source: http://www.google.com/patents/US6323927?dq=5,664,133
Timestamp: 2014-08-21 04:22:04
Document Index: 408448419

Matched Legal Cases: ['application No. 08', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09']

Patent US6323927 - IPS�LCD having electrodes′characteristics - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA liquid crystal display including: a first transparent substrate coated with a first alignment layer, a second transparent substrate coated with a second alignment layer, the second substrate facing the first transparent substrate, a liquid crystal layer between the substrates, a polarizer attached...http://www.google.com/patents/US6323927?utm_source=gb-gplus-sharePatent US6323927 - IPS�LCD having electrodes′characteristicsAdvanced Patent SearchPublication numberUS6323927 B1Publication typeGrantApplication numberUS 09/365,634Publication dateNov 27, 2001Filing dateAug 3, 1999Priority dateApr 4, 1996Fee statusPaidAlso published asUS5995186, US6317183, US6781660, US6903792, US7042543, US7369203, US7683999, US20010005253, US20020018167, US20020018168, US20040207793, US20070013851, US20080192185Publication number09365634, 365634, US 6323927 B1, US 6323927B1, US-B1-6323927, US6323927 B1, US6323927B1InventorsKomatsu HiroshiOriginal AssigneeLg Philips Lcd Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (65), Non-Patent Citations (18), Referenced by (11), Classifications (7), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetIPS�LCD having electrodes′characteristicsUS 6323927 B1Abstract A liquid crystal display including: a first transparent substrate coated with a first alignment layer, a second transparent substrate coated with a second alignment layer, the second substrate facing the first transparent substrate, a liquid crystal layer between the substrates, a polarizer attached on the outer surfaces of the substrates, a pair of electrodes formed on the first substrates, and a driving circuit applying signal voltage to the electrodes. The liquid crystal molecules adjacent to the first substrate is rotated by applying the voltage, but, the liquid crystal molecule adjacent to the second substrate is fixed regardless of the applied voltage. The electrode pair, substantially straight data and common electrodes, are inclined at an angle with respect to a gate line.
a first substrate; a transistor formed over the first substrate, the transistor including a gate electrode, a source electrode and a drain electrode; a data line formed over the first substrate, the data line being connected to the source electrode; a data electrode formed over the first substrate, the data electrode including a plurality of spaced apart parallel data projections formed in a first direction, the data electrode being connected to the drain electrode; a common electrode formed over the first substrate, the common electrode including a plurality of spaced apart parallel common projections formed in a second direction, the common projections being interdigitated with the data projections, the first direction being parallel to the second direction; and a gate line formed over the first substrate, the gate line being connected to the gate electrode. 2. The liquid crystal display device of claim 1, wherein at least one of the data electrode and the common electrode are formed of indium-tin-oxide.
a first insulating layer, the first insulating layer being formed under at least a portion of the data line and over at least a portion of the common electrode. 4. A liquid crystal display device comprising:
a first substrate; a transistor formed over the first substrate, the transistor including a gate electrode, a source electrode and a drain electrode; a data line formed over the first substrate, the data line being connected to the source electrode; a common electrode formed over the first substrate, the common electrode including a plurality of spaced apart parallel common projections formed in a first direction; a data electrode formed over the first substrate and connected to the drain electrode, the data electrode including a plurality of spaced apart parallel data portions formed in a second direction and interleaved between the common projections, the first direction being parallel to the second direction; an insulating layer formed over the common projections and under the data portions; and a gate line formed over the first substrate, the gate line being connected to the gate electrode. 5. The liquid crystal display device of claim 4, wherein the insulating layer is transparent.
a first substrate; a transistor formed over the first substrate, the transistor including a gate electrode, a source electrode and a drain electrode; a data line formed over the first substrate, the data line being connected to the source electrode; a common electrode formed over the first substrate, the common electrode including a plurality of spaced apart parallel common portions formed in a first direction; a data electrode formed over the first substrate and connected to the drain electrode, the data electrode including a plurality of spaced apart parallel data projections formed in a second direction and interleaved between the common portions, the first direction being parallel to the second direction; an insulating layer formed over the common projections and under the data portions; and a gate line formed over the first substrate, the gate line being connected to the gate electrode. 8. The liquid crystal display device of claim 7, wherein the common portions are connected to each other at only one end.
FIG. 4b shows a cross-section of the device taken along the line IV�IV of FIG. 4a; FIG. 5 shows a pixel electrode pattern according to the present invention;
0�<θFE<−90� FIG. 3 shows optical axes of the liquid crystal display according to the present invention. θEL is represented as the extension direction of the electrodes 48 and 59, θFE is the electric field direction applied by the electrodes, θLC1 is the optical axis direction of the liquid crystal molecules adjacent to the first substrate and θLC2 is the optical axis direction of the liquid crystal molecules adjacent to the second substrate when the voltage is not applied. θPL1 is the principal transmission axis of a polarizer, θPL2 is the principal transmission axis of an analyzer, θLC1 is the optical axis direction of the liquid crystal molecules adjacent to the first substrate when the voltage is applied. The alignment direction θLC1 of the first substrate is anti-parallel to the alignment direction θLC2 of the second substrate, and the principal transmission axis θPL2 of the analyzer is parallel to the alignment directions θLC1, θLC2. In addition, the principal transmission axis θPL1 of the polarizer is perpendicular to the principal transmission axis θPL2 of the analyzer.
The retardation value And, which provides a maximum transmittance to the liquid crystal layer 60, is calculated according to the following formula: Δnd=Δ(85�/90�)Δ=0.94. The dielectric anisotrophy Δn and the thickness d of the liquid crystal are appropriately arranged. The dielectric anisotrophy of the liquid crystal generally used in TN mode is 0.06-0.08, and the wave length of the light is 0.56 μm. When the values are substituted in the above formula, the thickness d should be 6.0-8.8 μm.
FIG. 4a shows a plan view of a liquid crystal display according to the present invention, and FIG. 4b shows a cross-sectional view taken along the line IVA�IVA of FIG. 4a. The area outside of the viewing area 21 is protected by a metal frame 22, an area deposited with a driving circuit 23 for a gate line, a driving circuit 24 for a data line, and a back light housing 25 including a back light 31. The viewing area or presentation unit 21 is shown in FIG. 4b to successively comprise a photoguide plate 75 including a photo-diffusion plate, a polarizer 63, a first substrate 27, a second substrate 26, and an analyzer 64. To compensate for the contrast ratio of the liquid crystal display, a retardation film can be deposited either between the polarizer 63 and the first substrate 27 or between the second substrate 26 and the analyzer 64.
The alignment layers 59, 62 coated on the first and second substrates 27, 26 are obtained: by coating, for example, RN1024 (produced in NISSAN CHEMICAL CO.) to a thickness of about 0.08 μm and baking. The alignment layer 59 coated on the first substrate 27 is rubbed in the −90� direction, and the alignment layer 62 coated on the second substrate 26 is rubbed in the 90� direction. The spacer 65 can be formed from Micropal(produced in SEKISUI FINE CHEMICAL CO.) with an exemplary 8.0 μm diameter, to maintain the liquid crystal layer 60 with a mean thickness of 7.8 μm. The liquid crystal material can be ZGS 5025(Δn=0.067; Δε=6.0; produced by CHISSO CO.). The pretilt angle of and the liquid crystal is 4.8�, and the retardation value Δnd is 0.41.
0�<θFE<90�. The electro optical characteristics of the above mentioned described TFT LCD are evident with reference to FIG. 7 and FIG. 8.
FIG. 7 shows the driving voltage pulse of the LCD fabricated according to the present invention, wherein, the LCD has a 12.1 inch screen, a 480�640 (R.G.B) array of pixels. The gate voltage VG 71 is VGH=20V, VGL=0V the width of the pulse=31 μs, and the common voltage VCO 72 is 8V direct voltage. In addition, the data voltage VD 73 is a monowave signal with a pulse width of 31 μs, of which the maximum voltage is 6V, the minimum voltage is 1V, and 5V is controlled in the signal area.
The rotation angle of the liquid crystal layer is detected by an evaluator for LCD (produced in NIHON DENSHI CO.). The results show that the liquid crystal molecules 1 μm distance from the second substrate 26 have a optic axis of 88�, and the liquid crystal molecules 1 μm distance from to the first substrate 27 have a optic axis of 19�. It can be understood that the alignment direction of the liquid crystal molecules near the second substrate 26 is almost fixed, but the alignment direction of the liquid crystal molecules near the first substrate 27 is rotated about the anticipated angle. At this position, the anticipated angle of the liquid crystal molecules is 16. Therefore, the liquid crystal molecule is twisted in the liquid crystal layer.
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2011Chimel Innolux CorporationLiquid crystal display having common and floating electrodes on one of substrates thereofUS8149368Apr 3, 2009Apr 3, 2012Lg Display Co., Ltd.In-plane switching LCD panel* Cited by examinerClassifications U.S. Classification349/141, 349/139, 349/138International ClassificationG02F1/133, G02F1/1343Cooperative ClassificationG02F1/134363European ClassificationG02F1/1343A8Legal EventsDateCodeEventDescriptionMar 15, 2013FPAYFee paymentYear of fee payment: 12Apr 29, 2009FPAYFee paymentYear of fee payment: 8Oct 17, 2008ASAssignmentOwner name: LG DISPLAY CO., LTD., KOREA, REPUBLIC OFFree format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;REEL/FRAME:021754/0230Effective date: 20080304Owner name: LG DISPLAY CO., LTD.,KOREA, REPUBLIC OFFree format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;US-ASSIGNMENT DATABASE UPDATED:20100203;REEL/FRAME:21754/230Free format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;US-ASSIGNMENT DATABASE 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