Liquid-crystal panel of polymer dispersed type, method of manufacturing the same, and liquid-crystal display apparatus
First Claim
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1. A liquid-crystal panel of polymer dispersed type comprising:
- a pair of substrates disposed so as to face each other, each being provided with an electrode for applying a voltage;
a polymer member filled in the space between said pair of substrates;
droplets of a liquid crystal mixed with said polymer member and filled in the space between said pair of substrates; and
spacers dispersed in the space between said pair of substrates so as to hold said pair of substrates at a specified distance, surface portions of said spacers having at least either of a scarce affinity with the droplets of the liquid crystal or a large affinity with said polymer member.
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Abstract
A liquid-crystal panel comprises a pair of transparent glass substrates each being provided with an electrode. Between the glass substrates are disposed spacers for defining a space and a mixture of droplets of a liquid crystal having a mean diameter of 3.0 μm or less and of a photo-curing polymer. The edge portions of the glass substrates are sealed with a seal polymer. In curing the photo-curing polymer during the process of manufacturing the liquid-crystal panel, the dose of an ultraviolet ray is set to 500 mJ/cm2 or more so as to reduce the diameters of the droplets of the liquid crystal, thereby preventing light leakage in the state without a voltage applied and improving the contrast. If the spacers are colored, the effect of preventing light leakage is increased. If the spacers are subjected to a surface treatment for rejecting the liquid crystal or composed of a polymer material of the same type as that of the photo-curing polymer, variations in diameter of the droplets of the liquid crystal can be prevented. With the structure, it becomes possible to provide a liquid-crystal panel in which light leakage in the black mode is reduced and which presents uniform and high-contrast display of images.
23 Citations
10 Claims
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1. A liquid-crystal panel of polymer dispersed type comprising:
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a pair of substrates disposed so as to face each other, each being provided with an electrode for applying a voltage;
a polymer member filled in the space between said pair of substrates;
droplets of a liquid crystal mixed with said polymer member and filled in the space between said pair of substrates; and
spacers dispersed in the space between said pair of substrates so as to hold said pair of substrates at a specified distance, surface portions of said spacers having at least either of a scarce affinity with the droplets of the liquid crystal or a large affinity with said polymer member. - View Dependent Claims (2, 3)
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4. A liquid-crystal display apparatus comprising:
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a liquid-crystal panel of polymer dispersed type;
a light radiating means for irradiating said liquid-crystal panel with light;
a driving circuit for applying an electrode signal to said liquid-crystal panel; and
a displaying means for displaying the patterns of light outputted from said liquid-crystal panel, wherein said liquid-crystal panel comprises;
a pair of substrates disposed so as to face each other, each being provided with an electrode for applying a voltage;
a polymer member filled in the space between said pair of substrates;
droplets of a liquid crystal mixed with said polymer member and filled in the space between said pair of substrates; and
spacers dispersed in the space between said pair of substrates so as to hold said pair of substrates at a specified distance, the surface portions of said spacers having at least either of a scarce affinity with the droplets of the liquid crystal or a large affinity with said polymer member.
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5. A liquid-crystal panel comprising:
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a pair of substrates disposed so as to face each other, each being provided with an electrode for applying a voltage;
spacers dispersed in a space between said pair of substrates so as to hold said pair of substrates at a specified distance, said spacers having a function of preventing transmission of visible light and having a surface roughness sufficiently high to scatter visible light;
a polymer member filled in the space between said pair of substrates; and
droplets of a liquid crystal mixed with said polymer member and filled in the space between said pair of substrates, said droplets of the liquid crystal having a mean diameter of 3.0 μ
m or less.
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6. A liquid-crystal panel of polymer dispersing type comprising:
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a pair of substrates disposed so as to face each other, each being provided with an electrode for applying a voltage;
spacers dispersed in a space between said pair of substrates so as to hold said pair of substrates at a specified distance;
a polymer member filled in the space between said pair of substrates, wherein surface portions of said spacers have at least either a scarce affinity with the droplets of the liquid-crystal or a large affinity with said polymer member; and
droplets of a liquid crystal mixed with said polymer member and filled in the space between said pair of substrates, said droplets of the liquid crystal having a mean diameter of 3.0 μ
m or less.- View Dependent Claims (7, 8)
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9. A liquid-crystal panel of polymer dispersed type comprising:
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a pair of substrates disposed so as to face each other, each being provided with an electrode for applying a voltage;
spacers dispersed in a space between said pair of substrates so as to hold said pair of substrates at a specified distance, said spacers being colored and having a surface roughness sufficiently high to scatter visible light;
a polymer member filed in the space between said pair of substrate; and
droplets of a liquid crystal mixed with said polymer member and filled in the space between said pair of substrates, said droplets of the liquid crystal having a mean diameter of 3.0 μ
m or less.
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10. A liquid-crystal panel of polymer dispersed type comprising:
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a pair of substrates disposed so as to face each other, each being provided with an electrode for applying a voltage;
spacers dispersed in a space between said pair of substrates so as to hold said pair of substrates at a specified distance, said spacers being colored and having surface portions;
a polymer member filed in the space between said pair of substrates wherein the surface portions of said spacers have at least either of a scarce affinity with the droplets of the liquid-crystal or a large affinity with said polymer member; and
droplets of a liquid crystal mixed with said polymer member and filled in the space between said pair of substrates, said droplets of the liquid crystal having a mean diameter of 3.0 μ
m or less.
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsUemura, Tsuyoshi, Inoue, Kazuo
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Primary Examiner(s)Sikes, William L.
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Assistant Examiner(s)NGUYEN, DUNG T
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Application NumberUS09/206,131Time in Patent Office918 DaysField of Search349/86, 349/92, 349/93, 349/155, 349/183US Class Current349/86CPC Class CodesG02F 1/1334 based on polymer dispersed ...G02F 1/13392 spacers dispersed on the ce...
