Substrate for liquid crystal display
AssigneeDai Nippon Printing Co., Ltd.
InventorsSeiji Tawaraya, Tomonobu Sumino, Shinji Hayashi
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Abstract
A principal object of the present invention is to provide a substrate for a liquid crystal display not undergoing mura called gravity defect because the amount of deformation in a small load region is large and having a uniformity of the panel and an adequate recovery factor against a local load. In order to achieve the aforementioned object, the present invention provides the substrate for a liquid crystal display comprises at least a transparent substrate and a columnar spacer formed on the transparent substrate. The substrate is characterized in that the amount of initial deformation A of the spacer measured by a predetermined measurement method is 0.04 μm or more and the amount of plastic deformation B is 0.7 μm or less.
Claims8
A substrate for a liquid crystal display comprising at least a transparent substrate and a columnar spacer formed on the transparent substrate, wherein the substrate for a liquid crystal display is a following amount of an initial deformation A obtained by measuring the columnar spacer by a following measurement method is 0.04 μm or more, and a following amount of a plastic deformation B is 0.7 μm or less:
- measurement method:
- a compression load is applied in a axial direction of the columnar spacer up to 80 mN at a load applying speed of 22 mPa/sec and that state is maintained for 5 seconds;
- thereafter, a load is removed down to 0 mN at a load removing speed of 22 mPa/sec, and that state is maintained for 5 seconds,
- amount of initial deformation A:
- an amount of a compression deformation obtained by X−Y assuming that an initial height of the columnar spacer is X, and a height when a load F (mN) obtained by a following formula (1) is applied during an above load application is Y:
- F=19.6/n (1)
- (10≦n≦50, n is a density of a number of columnar spacers (pieces/mm2)), amount of plastic deformation B:
- an amount of a residual deformation obtained by X−Z assuming that the initial height of the columnar spacer is X and a height after removing the load and maintaining that state for 5 seconds is Z.
Dependencies are inferred from the claim text.