Electrical stimulation device

1. An electrical stimulation device for providing electrical stimulation to skin of a user, the device comprising:

a patch layer that is a single patch layer, the patch layer is configured to be in direct contact with the skin of the user when the electrical stimulation device is worn by or attached to the user;

a plurality of patch segments disposed on the patch layer and spaced apart from each other, the plurality of patch segments is configured to be in indirect contact with the skin of the user via the patch layer when the electrical stimulation device is worn by or attached to the user, and transmit current or voltage to the patch layer; and

a blocking and adjustment unit configured to block or adjust voltage or current supplied to each of the plurality of patch segments,

wherein the blocking and adjustment unit is directly connected with each of the plurality of patch segments, and

wherein the patch layer includes hydrogel containing chloride ions, and the patch layer is further configured to

receive the current or voltage, which is transmitted from the plurality of patch segments, and

perform, by using the chloride ions contained in the hydrogel included in the patch layer, a direct application of the received current or voltage into a portion of the skin of the user, which is directly contacted with the patch layer,

wherein the blocking and adjustment unit comprises a plurality of switches and a plurality of variable resistors, and

wherein a respective switch of the plurality of switches is serially connected with a respective variable resistor of the plurality of variable resistors, and a respective combination of the respective switch and the respective variable resistor is configured to block voltage or current supplied to a respective patch segment of the plurality of patch segments.

2. The device of claim 1 , further comprising:

a monitoring unit configured to measure voltage or current supplied to each of the plurality of patch segments.

3. The device of claim 2 , further comprising:

a controller configured to control an operation of the blocking and adjustment unit,

wherein the controller is configured to:

when voltage or current measured by the monitoring unit is greater than or equal to a predetermined value of voltage or current, control the blocking and adjustment unit to block voltage or current supplied to each of the plurality of patch segments.

4. The device of claim 2 , further comprising:

a controller configured to control an operation of the blocking and adjustment unit,

wherein the controller is configured to:

when voltage or current measured by the monitoring unit is greater than or equal to a predetermined value of voltage or current, control the blocking and adjustment unit to block or adjust voltage or current supplied to the patch segment measured as the supplied voltage or current is greater than or equal to the voltage or current.

5. The device of claim 2 , further comprising:

a controller configured to control an operation of the blocking and adjustment unit,

wherein the plurality of patch segments comprises first and second patch segments,

wherein the monitoring unit is configured to measure a first voltage or current as being supplied to the first patch segment, and a second voltage or current as being supplied to the second patch segment, and

wherein the controller is configured to:

when a ratio of the measured first voltage or current to the measured second voltage or current is greater than a predetermined value, control the blocking and adjustment unit to block voltage or current supplied to each of the plurality of patch segments.

6. The device of claim 2 , further comprising:

a controller configured to control an operation of the blocking and adjustment unit,

wherein the plurality of patch segments comprises first and second patch segments,

wherein the monitoring unit is configured to measure a first voltage or current as being supplied to the first patch segment, and a second voltage or current as being supplied to the second patch segment, and

wherein the controller is configured to:

when a ratio of the measured first voltage or current to the measured second voltage or current is greater than a predetermined value, control the blocking and adjustment unit to block or adjust voltage or current supplied to the first patch segment.

7. The device of claim 2 , further comprising:

a controller configured to control an operation of the blocking and adjustment unit,

wherein the plurality of patch segments comprises first and second patch segments,

wherein the monitoring unit is configured to measure a first voltage or current as being supplied to the first patch segment and a second voltage or current as being supplied to the second patch segment,

wherein the controller is configured to, when a ratio of the measured first voltage or current to the measured second voltage or current is greater than a predetermined value, control the blocking and adjustment unit to block or adjust voltage or current supplied to the first patch segment, and

wherein the patch layer includes a region that is in contact with the first patch segment, the region is

configured to no longer transmit voltage or current from the first patch segment to the skin when the voltage or current supplied to the first patch segment is blocked, and

configured to transmit an adjusted amount of voltage or current from the first patch segment to the skin when the voltage or current supplied to the first patch segment is adjusted.

8. The device of claim 2 , further comprising:

a connection selecting unit disposed on between the plurality of patch segments and the blocking and adjustment unit, and configured to selectively connect at least one patch segment corresponding to a measurement target among the plurality of patch segments to the monitoring unit.

9. The device of claim 1 , wherein the patch layer has resistivity of material forming the patch layer, the resistivity being higher than resistivity of material forming the plurality of patch segments.

10. The device of claim 1 , wherein the patch layer comprises a material having a resistivity configured to render an impedance of the patch layer to prevent a current density of an edge portion of the patch layer from increasing due to an edge-effect.