A level shifter circuit is provided. The level shifter circuit includes a first voltage-based input circuit configured to generate a first voltage-based inverted voltage and a first voltage-based non-inverted voltage based on an input voltage having a first voltage as a first peak voltage; a pull-up circuit configured to generate a second voltage-based first current corresponding to the first voltage-based non-inverted voltage, generate a second voltage-based pull-up current based on the second voltage-based first current, and pull up an output voltage according to the second voltage-based pull-up current when the first voltage-based non-inverted voltage increases; and a pull-down circuit configured to generate a second voltage-based second current corresponding to the first voltage-based inverted voltage, generate a second voltage-based pull-down current based on the second voltage-based second current, and pull down the output voltage according to the second voltage-based pull-down current when the first voltage-based inverted voltage increases.