US 7,609,343 B2Granted

Liquid crystal display device and method of manufacturing the same

AssigneesNEC LCD Technologies, Ltd., NEC Corporation

InventorsMichiaki Sakamoto, Osamu Sukegawa, Hidenori Ikeno

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Abstract

In a semi-transmissive liquid crystal display device, the thickness of liquid crystal layer in the reflective region can be adjusted by controlling the film thickness of the organic insulating film for reflection and the film thickness of the color layer for reflection. Furthermore, the thickness of liquid crystal layer in the transmissive region can be adjusted by controlling the film thickness of the organic insulating film for transmission and the film thickness of the color layer for transmission. Since the thicknesses of liquid crystal layer in the reflective region and that in the transmissive region can be adjusted, the reflectance in the reflective region and the transmittance in the transmissive region can each be set at the most appropriate values.

Claims18

Dependent claims

A method for manufacturing a liquid crystal display device, comprising:

forming a plurality of wiring lines intersecting one another and wired longitudinally and laterally on a first substrate while partitioning a display area into a plurality of pixels on said first substrate;
forming on said first substrate a first insulation film covering said plurality of wiring lines and said plurality of pixels;
defining in each of said plurality of pixels a reflective region for reflecting light from a display face and a transmissive region for allowing light from a back light positioned opposite said plurality of pixels with reference to said first substrate, and then, forming an insulation film for reflection corresponding to said reflective region on said first insulation film;
forming a reflective electrode on said insulation film for reflection;
forming on said first insulation film a transparent electrode corresponding to said transmissive region;
forming on a second substrate a color layer for reflection and a color layer for transmission so as to correspond to said reflective region and said transmissive region, respectively;
forming a common electrode so as to cover said color layer for reflection and said color layer for transmission;
disposing said second substrate in opposition to said first substrate;
and
interposing a liquid crystal layer between said first substrate and said second substrate,
wherein a thickness of said liquid crystal layer corresponding to said reflective region is different than a thickness of said liquid crystal layer corresponding to said transmissive region,
wherein a thickness of a portion of said liquid crystal layer interposed between a surface of said reflective electrode and a surface of said color layer for reflection and a thickness of a portion of said liquid crystal layer interposed between a surface of said transparent electrode and a surface of said color layer for transmission are configured to maximize a reflectance in said reflective region and a transmittance in said transmissive region with respect to individual twist angles of liquid crystal molecules, and
wherein a boundary between said color layer for reflection and said color layer for transmission is unaligned with a boundary between said reflective and transmissive regions.

10 more elements

A method for manufacturing a liquid crystal display device, comprising:

forming a plurality of wiring lines intersecting one another and wired longitudinally and laterally on a first substrate while partitioning a display area into a plurality of pixels on said first substrate;
forming on said first substrate a first insulation film covering said plurality of wiring lines and said plurality of pixels;
defining in each of said plurality of pixels a reflective region for reflecting light from a display face and a transmissive region for allowing light from a back light positioned opposite said plurality of pixels with reference to said first substrate, and then, forming an insulation film for reflection corresponding to said reflective region on said first insulation film;
forming a reflective electrode on said insulation film for reflection;
forming on said first insulation film a transparent electrode corresponding to said transmissive region;
forming on a second substrate a color layer for reflection and a color layer for transmission so as to correspond to said reflective region and said transmissive region, respectively;
forming a common electrode so as to cover said color layer for reflection and said color layer for transmission;
disposing said second substrate in opposition to said first substrate;
and
interposing a liquid crystal layer between said first substrate and said second substrate,
wherein a thickness of said liquid crystal layer corresponding to said reflective region is different than a thickness of said liquid crystal layer corresponding to said transmissive region,
wherein a thickness of a portion of said liquid crystal layer interposed between a surface of said reflective electrode and a surface of said color layer for reflection and a thickness of a portion of said liquid crystal layer interposed between a surface of said transparent electrode and a surface of said color layer for transmission are configured to maximize a reflectance in said reflective region and a transmittance in said transmissive region with respect to individual twist angles of liquid crystal molecules,
wherein a boundary between said color layer for reflection and said color layer for transmission is unaligned with a boundary between said reflective and transmissive regions, and
wherein said color layer for reflection has a thickness which is different from a thickness of said color layer for transmission.

11 more elements

A method for manufacturing a liquid crystal display device, comprising:

forming a plurality of wiring lines intersecting one another and wired longitudinally and laterally on a first substrate while partitioning a display area into a plurality of pixels on said first substrate;
forming on said first substrate a first insulation film covering said plurality of wiring lines and said plurality of pixels;
defining in each of said plurality of pixels a reflective region for reflecting light from a display face and a transmissive region for allowing light from a back light positioned opposite said plurality of pixels with reference to said first substrate, and then, forming an insulation film for reflection corresponding to said reflective region on said first insulation film;
forming a reflective electrode on said insulation film for reflection;
forming on said first insulation film a transparent electrode corresponding to said transmissive region;
forming on a second substrate a color layer for reflection and a color layer for transmission so as to correspond to said reflective region and said transmissive region, respectively;
forming a common electrode so as to cover said color layer for reflection and said color layer for transmission;
disposing said second substrate in opposition to said first substrate;
and
interposing a liquid crystal layer between said first substrate and said second substrate,
wherein a thickness of said liquid crystal layer corresponding to said reflective region is different than a thickness of said liquid crystal layer corresponding to said transmissive region,
wherein a thickness of a portion of said liquid crystal layer interposed between a surface of said reflective electrode and a surface of said color layer for reflection and a thickness of a portion of said liquid crystal layer interposed between a surface of said transparent electrode and a surface of said color layer for transmission are configured to maximize a reflectance in said reflective region and a transmittance in said transmissive region with respect to individual twist angles of liquid crystal molecules,
wherein a boundary between said color layer for reflection and said color layer for transmission is unaligned wit a boundary between said reflective and transmissive regions, and
wherein said color layer for transmission has a thickness which is greater than a thickness of said color layer for reflection.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/264,256Filed 2 Nov 2005 · division
Priority: JP 2001/35521020 Nov 2001
Published: US 2006/0055851 A116 Mar 2006
Granted: 27 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G02F 1/133555
Reflecting elements: transflectors
G02F 1/133371
Constructional arrangements; Manufacturing methods: cells with varying thickness of the liquid crystal layer
G02F
Optical devices or arrangements for the control of light by modification of

Family

Application10/298,908Parent of this division · filed 19 Nov 2002
US 2006/0055851 A1Pre-grant publication · published 16 Mar 2006
US 7,015,996 B2Parent of this division
US 2003/0095217 A1Published application
US 7,609,343 B2This patent

From the US filing history. Foreign family members aren’t listed.

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