US 6,388,646 B1 · Display device

Abstract

It is an object of the invention to reduce a leakage low-frequency electric field from a panel section of a matrix type. In the case where a panel section has a usual current structure in which the panel section has a single common electrode elongating over the whole of the display region of the panel section, the maximum voltage difference of a reference signal supplied to the common electrode is defined to be 0.3678×x−0.6136 (wherein x is the area of the display region) or less. In the case where the panel section has the so-called counter source structure and a plurality of column electrodes, the maximum voltage difference of a reference signal supplied to the column electrodes is defined to be ax−b (wherein a=0.3565×y−0.6829, b=−0.0937y+0.7091, and y is a ratio of the area of all the column electrodes to the area of the display region) or less. In the case where a panel section has the counter source structure, the average area per unit length of one part of the column electrode opposed to a signal line is smaller than the average area per unit length of the remaining part of the column electrode other than the one part.

Claims19

Dependent claims

A display device comprising:

a panel section including a plurality of pixel electrodes which are arranged in a predetermined reference plane, a display medium layer consisting of a display medium whose state relating to a display is changed in accordance with an electric field, and a single common electrode which is opposed to all the pixel electrodes via the display medium layer;
gradation signal supplying means for supplying a gradation signal of a voltage which varies with time, to the respective pixel electrodes, in order to define the electric field for controlling the state of the display medium interposed between the pixel electrodes and the counter electrodes;
and
reference signal supplying means for supplying a reference signal of a voltage which varies in a predetermined pattern with time, to the common electrode,
a difference Vbpp between maximum and minimum voltages of the reference signal, being equal to or smaller than a first upper limit voltage difference VMAX1 which is defined by an area x [m2] of the common electrode as follows:
VMAX1=0.3578×x−0.6156 [V].

3 more elements

A display device comprising:

a panel section including a plurality of pixel electrodes which are arranged in a predetermined reference plane;
a display medium layer consisting of a display medium whose state relating to a display is changed in accordance with an electric field;
and a plurality of counter electrodes which are opposed to the pixel electrodes via the display medium layer, respectively;
reference signal supplying means for supplying a reference signal of a voltage which varies in a predetermined pattern with time, to all of the pixel electrodes;
and
gradation signal supplying means for supplying a gradation signal of a voltage variable with time, to the respective counter electrodes in order to define the electric field for controlling the state of the display medium interposed between the pixel electrodes and the counter electrodes,
a difference Vspp between maximum and minimum voltages of the gradation signal, which is equal to or smaller than a second upper limit voltage difference VMAX2 which is defined by an area x [m2] of a predetermined display region where all the pixel electrodes can be arranged, and a ratio y of an area of all the counter electrodes to the area x of the display region as follows:
VMAX2=a×x−b [V]
wherein
a=0.3565×y−0.6829
b=−0.0937y+0.7091.

8 more elements

A display device comprising:

a panel section including a plurality of pixel electrodes which are arranged in a predetermined reference plane, a display medium layer consisting of a display medium whose state relating to a display is changed in accordance with an electric field, and a plurality of counter electrodes which are opposed to the pixel electrodes via the display medium layer, respectively;
reference signal supplying means for supplying a reference signal of a voltage which varies in a predetermined pattern with time, to all the pixel electrodes;
and
gradation signal supplying means for supplying a gradation signal of a voltage variable with time, to each of the counter electrodes in order to define the electric field for controlling the state of the display medium interposed between the pixel electrodes and the counter electrodes,
a difference Vdyn between a voltage between the pixel electrodes and the counter electrodes in the case where an electric field for setting the state of the display medium to a predetermined first state is defined, and a voltage between the pixel electrodes and the counter electrodes in the case where an electric field for setting the state of the display medium to a second state which is different from the first state is defined, being equal to or smaller than a third upper limit voltage difference VMAX3 which is defined by an area x [m2] of a predetermined display region where all the pixel electrodes can be arranged, and a ratio y of an area of all the counter electrode to the area x of the display region as follows:
VMAX3=a×x−b [V]
wherein
a=0.3565×y−0.6829
b=−0.0937y+0.7091.

6 more elements

Dependencies are inferred from the claim text.

Display device

Life of this patent

Display device

Life of this patent

Abstract

Claims19