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US 6,473,149 B2Granted
Elimination of the reverse-tilt in high-density reflective LCDs
AssigneeKoninklijke Phillips Electronics N.V.
InventorsGeorge A. Melnik, Robert H. Kane, Ronald D. Pinker, Gerard Cnossen
Life of this patent
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Abstract
An LCD having the liquid crystal in at least a portion of the interpixel region displaced by a spacer material. The spacer material has a low dielectric constant relative to the liquid crystal, thus further impeding the formation of a bend deformation in the liquid crystal in the interpixel region when pixels on opposite sides of the spacer material are operating in the inversion mode. This elimination of the bend deformation in the interpixel region eliminates the reverse tilt disclination.
Claims20
A high density LCD comprising:
- secondary electrodes which are separated from each other solely by an interpixel region in both row and column directions;
- drive circuits for providing voltage levels to said secondary electrodes;
- a common electrode;
- a liquid crystal located between said secondary electrodes and said common electrode;
- said liquid crystal in at least a portion of the interpixel region being displaced by a spacer material which is arranged between adjacent secondary electrodes without overlap of said adjacent secondary electrodes, wherein the spacer material has a dielectric permittivity which is less than that of the liquid crystal, the spacer material suppressing the formation of a disclination near the interpixel region when pixels on opposite sides of the spacer material are operating in an inversion mode, wherein the high density LCD has a fill factor of at least 90%.
2 more elements
An LCD comprising:
- secondary electrodes which are separated from each other by an interpixel region;
- drive circuits for providing voltage levels to said secondary electrodes;
- a common electrode;
- and
- a liquid crystal located between said secondary electrodes and said common electrode;
- characterized in that:
- said liquid crystal in at least a portion of the interpixel region is displaced by a spacer material which is arranged between adjacent secondary electrodes and extends vertically into the liquid crystal from a first substrate of the LCD in the interpixel region without overlap of said adjacent secondary electrodes, and
- the spacer material has a dielectric permittivity which is less than that of the liquid crystal, the spacer material suppressing the formation of disclination near the interpixel region when pixels on opposite sides of the spacer material are operating in an inversion mode,
- wherein the LCD has a fill factor of at least 90%.
6 more elements
An LCD comprising:
- secondary electrodes which are separated from each other by an interpixel region;
- drive circuits for providing voltage levels to said secondary electrodes;
- a common electrode;
- and
- a liquid crystal located between said secondary electrodes and said common electrode;
- characterized in that said liquid crystal in at least a portion of the interpixel region is displaced by a spacer material which extends as a plurality of ribs, each rib extending continuously between a first plurality of respective secondary electrodes to one side of the rib, and a second plurality of respective secondary electrodes to the other side of the respective ribs, and
- the spacer material has a dielectric permittivity which is less that that of the liquid crystal, the spacer material suppressing the formation of a disclination near the interpixel region when pixels on opposite sides of a respective rib are operating in an inversion mode,
- wherein the LCD has a fill factor of at least 90%.
5 more elements
Dependencies are inferred from the claim text.