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US 2019/0165771 A1Published application
Signal level converter and display driving device
AssigneeSharp Kabushiki Kaisha
InventorAKIRA MASAOKA
Life of this patent
Estimating the term…
Abstract
A signal level converter includes a bias generating circuit that generates a bias voltage, and a level shifter circuit that converts a lower voltage signal into a higher voltage signal in response to the bias voltage. The bias generating circuit includes a replica circuit that controls an on-current of the level shifter circuit in response to the bias voltage output from an operational amplifier.
Claims10
A signal level converter comprising:
- a bias generating circuit that generates a bias voltage;
- and
- a level shifter circuit that converts a lower voltage signal into a higher voltage signal in response to the bias voltage,
- wherein the bias generating circuit includes an operational amplifier that outputs the bias voltage, and
- a replica circuit that controls an on-current of the level shifter circuit in response to the bias voltage output from the operational amplifier.
2 more elements
A display driving device comprising:
- at least one first block including a bias generating circuit that generates a bias voltage, a voltage to current converting circuit that converts the bias voltage generated by the bias generating circuit into a bias current signal and outputs the bias current signal, and a control signal generating circuit that generates a control signal;
- and
- at least one second block including a display driving signal generating block that generates a display driving signal, a current to voltage converting circuit that converts the bias current signal output from the voltage to current converting circuit into the bias voltage, and a level shifter circuit that converts a lower voltage signal into a higher voltage signal in response to the bias voltage,
- wherein a number of the second blocks is higher than a number of the first blocks.
1 more element
A display driving device comprising:
- at least one first block including a bias generating circuit that generates a bias voltage, a voltage to current converting circuit that converts the bias voltage generated by the bias generating circuit into a bias current signal and outputs the bias current signal, a repeater circuit that distributes one output from the voltage to current converting circuit to a plurality of output branches, and a control signal generating circuit that generates a control signal;
- at least one second block including a display driving signal generating block that generates a display driving signal, a current to voltage converting circuit that converts the bias current signal output from the voltage to current converting circuit into the bias voltage, and a level shifter circuit that converts a lower voltage signal into a higher voltage signal in response to the bias voltage;
- at least one third block including the current to voltage converting circuit, the level shifter circuit, and a current mirror circuit;
- and
- at least one fourth block including the display driving signal generating block, the current to voltage converting circuit, the level shifter circuit, and the repeater circuit,
- wherein the current mirror circuit in the third block is connected to the repeater circuit in the fourth block,
- wherein each of a number of the third blocks and a number of the fourth blocks is higher than a number of the first blocks, and
- wherein a number of the second blocks is higher than each of the number of the third blocks and the number of the fourth blocks.
5 more elements
Dependencies are inferred from the claim text.