Liquid crystal display and method of driving same
First Claim
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1. A method of driving a reflective type liquid crystal display device,said reflective type liquid crystal display device comprising:
- a first insulating substrate having transparency;
a reflecting layer;
a second insulating substrate being disposed opposite to the first insulating substrate, at least a part of said second insulating substrate covering the reflecting layer;
a first electrode being formed over the first insulating substrate;
a first conducting line for applying electrical signals to the first electrode, said first conducting line being formed over the first insulating substrate;
a first thin film transistor formed over the first insulating substrate as a switching element and electrically connected to the first electrode and the first conducting line, said first thin film transistor comprising;
a crystalline semiconductor island formed over the first insulating substrate;
source and drain regions formed in the crystalline semiconductor island;
a gate electrode formed adjacent to the crystalline semiconductor island having a gate insulating film therebetween, a pair of low concentration regions each being adjacent to the source and drain regions in the crystalline semiconductor island;
an interlayer insulating film covering the first thin film transistor, said interlayer insulating film being a multilayer film of silicon oxide and silicon nitride;
a second electrode being formed over the first insulating substrate, said second electrode being electrically insulated from the first electrode and from the first conducting line;
a second conducting line for applying electrical signals to the second electrode, said second conducting line being formed on the first insulating substrate;
a liquid crystal material being interposed between the first and second insulating substrates;
said method comprising the steps of;
producing a parallel electric field to the first insulating substrates, said parallel electric field being generated between the first and second electrodes, and driving the liquid crystal material by the parallel electric field, wherein the liquid crystal material is oriented in a hybrid alignment nematic mode.
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Abstract
There is disclosed a lightweight and small liquid crystal display which achieves low power consumption and in which the optical anisotropy of the liquid crystal material is compensated for in order to enhance the viewing angle characteristics and the response speed of the liquid crystal material. Display electrodes and a common electrode are formed on one of the substrates. The orientation of the liquid crystal material is of the HAN (hybrid alignment nematic) type. This compensates for the optical anisotropy of the liquid crystal material and improves the response speed.
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Citations
45 Claims
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1. A method of driving a reflective type liquid crystal display device,
said reflective type liquid crystal display device comprising: -
a first insulating substrate having transparency;
a reflecting layer;
a second insulating substrate being disposed opposite to the first insulating substrate, at least a part of said second insulating substrate covering the reflecting layer;
a first electrode being formed over the first insulating substrate;
a first conducting line for applying electrical signals to the first electrode, said first conducting line being formed over the first insulating substrate;
a first thin film transistor formed over the first insulating substrate as a switching element and electrically connected to the first electrode and the first conducting line, said first thin film transistor comprising;
a crystalline semiconductor island formed over the first insulating substrate;
source and drain regions formed in the crystalline semiconductor island;
a gate electrode formed adjacent to the crystalline semiconductor island having a gate insulating film therebetween, a pair of low concentration regions each being adjacent to the source and drain regions in the crystalline semiconductor island;
an interlayer insulating film covering the first thin film transistor, said interlayer insulating film being a multilayer film of silicon oxide and silicon nitride;
a second electrode being formed over the first insulating substrate, said second electrode being electrically insulated from the first electrode and from the first conducting line;
a second conducting line for applying electrical signals to the second electrode, said second conducting line being formed on the first insulating substrate;
a liquid crystal material being interposed between the first and second insulating substrates;
said method comprising the steps of;
producing a parallel electric field to the first insulating substrates, said parallel electric field being generated between the first and second electrodes, and driving the liquid crystal material by the parallel electric field, wherein the liquid crystal material is oriented in a hybrid alignment nematic mode. - View Dependent Claims (2, 3, 4, 5)
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6. A method of driving a reflective type liquid crystal display device,
said reflective type liquid crystal display device comprising: -
a first insulating substrate having transparency;
a reflecting layer;
a second insulating substrate being disposed opposite to the first insulating substrate, at least a part of said second insulating substrate covering the reflecting layer, a first electrode being formed over the first insulating substrate;
a first conducting line for applying electrical signals to the first electrode, said first conducting line being formed over the first insulating substrate;
a first thin film transistor being formed over the first insulating substrate as a switching element and electrically connected to the first electrode and the first conducting line;
said first thin film transistor comprising;
a crystalline semiconductor island formed over the first insulating substrate;
source and drain regions formed in the crystalline semiconductor island;
a gate electrode formed adjacent to the crystalline semiconductor island having a gate insulating film therebetween, a pair of low concentration regions each being adjacent to the source and drain regions in the crystalline semiconductor island;
a second thin film transistor formed over the first insulating substrate for driving the first thin film transistor;
an interlayer insulating film covering each of the first and second thin film transistors, said interlayer insulating film being a multilayer film of silicon oxide and silicon nitride;
a second electrode being formed over the first insulating substrate and electrically insulated from the first electrode and from the first conducting line;
a second conducting line for applying electrical signals to the second electrode, said second conducting line being formed over the first insulating substrate;
a biaxial film disposed over the first insulating substrate;
a polarizing plate disposed on the biaxial film;
a liquid crystal material being interposed between the first and second insulating substrates;
said method comprising the steps of;
producing a parallel electric field to the first insulating substrates, said parallel electric field being generated between the first and second electrodes, and driving the liquid crystal material by the parallel electric field, wherein the liquid crystal material is oriented in a hybrid alignment nematic mode. - View Dependent Claims (7, 8, 9, 10)
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11. A method of driving a reflective type liquid crystal display device,
said reflective type liquid crystal display device comprising: -
a first insulating substrate having transparency;
a second insulating substrate being disposed opposite to the first insulating substrate having a reflecting layer thereon;
a first electrode being formed over the first insulating substrate;
a first conducting line for applying electrical signals to the first electrode, said first conducting line being formed over the first insulating substrate;
a first thin film transistor being formed over the first insulating substrate as a switching element and electrically connected to the first electrode and the first conducting line;
said first thin film transistor comprising;
a crystalline semiconductor island formed over the first insulating substrate;
source and drain regions formed in the crystalline semiconductor island;
a gate electrode formed adjacent to the crystalline semiconductor island having a gate insulating film therebetween, a pair of low concentration regions each being adjacent to the source and drain regions in the crystalline semiconductor island;
a second thin film transistor being formed over the first insulating substrate for driving the first thin film transistor, said second thin film transistor including an n-channel third thin film transistor and a p-channel fourth thin film transistor being connected to each other;
an interlayer insulating film covering each of the first and second thin film transistors, said interlayer insulating film being a multilayer film of silicon oxide and silicon nitride;
a second electrode being formed over the first insulating substrate and electrically insulated from the first electrode and from the first conducting line;
a second conducting line for applying electrical signals to the second electrode, said second conducting line being formed over the first insulating substrate;
a liquid crystal material being interposed between the first and second insulating substrates;
said method comprising the steps of;
producing a parallel electric field to the first insulating substrate, said parallel electric field being generated between the first and second electrodes, and driving the liquid crystal material by the parallel electric field, wherein the liquid crystal material is oriented in a hybrid alignment nematic mode, wherein the liquid crystal material has a first orientation near the first insulating substrate while the liquid crystal material has a second orientation near the second insulating substrate, said second orientation being different from the first orientation. - View Dependent Claims (12, 13, 14, 15)
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16. A method of driving a reflective type liquid crystal display device,
said reflective type liquid crystal display device comprising: -
a first insulating substrate having transparency;
a second insulating substrate being disposed opposite to the first insulating substrate;
a reflecting layer on the second insulating substrate;
a first electrode being formed over the first insulating substrate;
a first conducting line for applying electrical signals to the first electrode, said first conducting line being formed over the first insulating substrate;
a first thin film transistor formed over the first insulating substrate as a switching element and electrically connected to the first electrode and the first conducting line;
said first thin film transistor comprising;
a crystalline semiconductor island formed over the first insulating substrate;
source and drain regions formed in the crystalline semiconductor island;
a gate electrode formed adjacent to the crystalline semiconductor island having a gate insulating film therebetween, a pair of low concentration regions each being adjacent to the source and drain regions in the crystalline semiconductor island;
a second thin film transistor formed over the first insulating substrate for driving the first thin film transistor;
an interlayer insulating film covering each of the first and second thin film transistors, said interlayer insulating film being a multilayer film of silicon oxide and silicon nitride;
a second electrode being formed over the first insulating substrate and electrically insulated from the first electrode and from the first conducting line;
a second conducting line for applying electrical signals to the second electrode, said second conducting line being formed over the first insulating substrate;
a liquid crystal material being interposed between the first and second insulating substrates;
said method comprising the steps of;
producing a parallel electric field to the first insulating substrates, said parallel electric field being generated between the first and second electrodes, and driving the liquid crystal material by the parallel electric field, wherein the liquid crystal material is oriented in a hybrid alignment nematic mode, wherein the liquid crystal material is oriented substantially horizontally to the first insulating substrate near the first insulating substrate while the liquid crystal material is oriented substantially vertically to the second insulating substrate near the second insulating substrate. - View Dependent Claims (17, 18, 19, 20)
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21. A method of driving a liquid crystal display device comprising:
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a first substrate;
a second substrate being disposed opposite to the first insulating substrate, a first electrode formed over the first substrate;
a first conducting line for applying electrical signals to the first electrode, said first conducting line being formed over the first substrate;
a second electrode, said second being electrically insulated from the first electrode and from the first conducting line;
a thin film transistor formed over the first substrate, said thin film transistor being electrically connected to the first electrode and the first conducting line; and
an interlayer insulating film covering the thin film transistor;
wherein said interlayer insulating film is a multilayer film comprising silicon oxide film and silicon nitride film;
wherein a liquid crystal material is interposed between said first substrate and said second substrate;
said method comprising;
producing a parallel electric field to the first substrate, said parallel electric field being generated between the first and second electrodes, and driving the liquid crystal material by the parallel electric field. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of driving a liquid crystal display device comprising:
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a thin film transistor over a first substrate;
an interlayer insulating film provided over the thin film transistor;
said interlayer insulating film being a multilayer film comprising silicon oxide film and silicon nitride film;
a wiring provided over said interlayer insulating film;
a part extended from said wiring being electrically connected to the thin film transistor through a contact hole in said interlayer insulating film;
a first insulating film provided over a part of said interlayer insulating film and a part of said wiring;
a display electrode provided over said first insulating film;
a part extended from said display electrode being electrically connected to the wiring through a contact hole in said first insulating film;
a second insulating film provided over said display electrode;
a common electrode provided over said second insulating film;
a liquid crystal material interposed between said first substrate and a second substrate;
said method comprising;
generating an electric field generated between the display and common electrodes; and
driving the liquid crystal material by the electric field. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsNishi, Takeshi, Yamazaki, Shunpei
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Primary Examiner(s)TON, MINH TOAN T
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Application NumberUS09/686,653Time in Patent Office1,855 DaysField of Search349/130, 349/39, 349/43, 349138-141, 349/113US Class Current349/141CPC Class CodesG02F 1/13306 Circuit arrangements or dri...G02F 1/13363 Birefringent elements, e.g....G02F 1/134363 for applying an electric fi...G02F 1/13454 Drivers integrated on the a...G02F 1/1393 the birefringence of the li...G02F 2203/02 reflective
