Samsung Display Co., Ltd.

Samsung Electronics Co., Ltd.

Sungchun Park

Yanguk Nam

Yoon Young Lee

Jin-taek Hong

Kwangtaek Woo

Woonsang Son

Jeongmin Seo

Kwanghun Kang

Eunryeol Baek

Unsang Park

A power voltage generator includes: an input voltage providing part outputting input voltage based on a first signal; an inductor receiving the input voltage to generate an inductor current and connected to an outputting part; the outputting part generating an output voltage based on the inductor current and generating a feedback voltage; an output sensing part sensing the output voltage based on a second signal and generating an output sensing voltage; a peak voltage generator generating a peak voltage based on the input voltage, set data corresponding to an output set voltage, and ripple data corresponding to a ripple set voltage; a first comparing part generating a stop signal based on the output sensing and peak voltages; a second comparing part generating a start signal based on the set data and feedback voltage; and a switch controller generating the first and second signals based on the start and stop signals.

Power voltage generator and display device having the same

A power management circuit is disclosed that includes a boost converter, a pass transistor, and an overcurrent detect circuit. The boost converter is configured to convert an input voltage into a first power supply voltage. The pass transistor is configured to transfer the first power supply voltage as a second power supply voltage after a predetermined time from a time point at which the first power supply voltage is activated. The overcurrent detect circuit is configured to perform an overcurrent detect operation by sensing a current flowing through the pass transistor. A display device is also disclosed that includes the power management circuit.

Power management circuit and display device including the same

An electronic device for handling a performance bottleneck of a system and an operating method thereof are provided. The electronic device includes a processor and a memory configured to store at least one instruction executable by the processor, wherein the processor, as a response to executing the at least one instruction, may determine, from a point in time corresponding to a start of a predetermined task, whether a threshold time preset for the task arrives, stop determining whether the threshold time has arrived in response to the task terminating prior to the threshold time arriving, and control one or more of resources for performing a task in response to the threshold time arriving prior to the task terminating.

Electronic device for handling bottleneck in system and operating method thereof

Disclosed is a display device which includes a voltage generator including a first converter that generates a first voltage using an input voltage and is shut down in response to a shutdown signal and a short circuit protection part including a first short circuit protection part that compares an output voltage of an output terminal of the first converter with a first reference voltage and outputs the shutdown signal. The first converter pre-charges the output voltage to a predetermined voltage level during a first period, maintains a level of the output voltage during a second period subsequent to the first period, and boosts and outputs the output voltage as the first voltage during a third period subsequent to the second period. The first short circuit protection part outputs the shutdown signal when the output voltage in the second period has a level lower than that of the first reference voltage.

Display device having a short circuit protection part to output a shutdown signal

A DC-DC converter includes a first switching element, a second switching element, a first amplifier, a second amplifier, a Pulse Width Modulation (PWM) controller, an output inductor and a power compensator. The second switching element is connected to the first switching element. The first amplifier outputs a first switching control signal to control the first switching element. The second amplifier outputs a second switching control signal to control the second switching element. The PWM controller generates a control signal applied to input terminals of the first amplifier and the second amplifier. The output inductor includes a first terminal connected to the first switching element and the second switching element and a second terminal outputting the pixel power supply voltage. The power compensator receives an input voltage and adjusts a power supply voltage applied to a power supply terminal of the first amplifier.

DC-DC converter and display device having the same

A power supply unit includes: a first DC-DC converter that generates a first power supply voltage and a second DC-DC converter that generates a second power supply voltage. The second DC-DC converter includes an inductor, a mode selector that receives at least one signal including information on an inductance value of the inductor and generates an inductor selection driving signal based on the at least one signal, and a feedback loop that receives the inductor selection driving signal and changes a parameter value for generating a current flowing through the inductor based on the inductor selection driving signal.

Power supply unit, display device including the same, and method for driving power supply unit

A voltage converter includes a first switching element, a second switching element, and a forced maintaining circuit. The first switching element is configured to operate based on a switching control signal. The second switching element is connected to the first switching element. The second switching element is configured to operate based on the switching control signal in a synchronous mode and operate in a diode mode in an asynchronous mode. The forced maintaining circuit is connected to the second switching element and configured to maintain the asynchronous mode for a forced maintaining period after entering the asynchronous mode.

Voltage converter, method of voltage conversion using the same and display apparatus including the same

A DC-DC converter includes: a first converter including a pass transistor coupled between the first node and a first output, and a body diode connected in parallel to the pass transistor; a sensor coupled between both ends of the pass transistor and which detects a driving current; and a second converter which outputs a second power voltage lower than the first power voltage to a second output. The second converter includes a master inverting converter which outputs the second power voltage independently of the driving current, a slave inverting converter which outputs the second power voltage when the driving current is greater than a predetermined threshold or when the input power voltage is greater than a predetermined boosting voltage limit, and an inverting converter controller which controls operations of the master and slave inverting converters in first and second drive modes based on the driving current and the input power voltage.

A display device includes: a display panel; a power management circuit configured to: perform a short detection operation with a first short detection condition during a start-up operation; supply first and second power supply voltages in the normal mode; and stop supplying the first and second power supply voltages in the low power mode; and a display driver configured to provide a first image signal in the normal mode and a second image signal for in the low power mode, the display driver comprising a power block configured to supply first and second standby power supply voltages in the low power mode, wherein, in a transition frame between the low power mode and the normal mode, the display driver provides the second image signal for the standby image to the display panel, and the power management circuit performs the short detection operation with a second short detection condition.

Display device supporting a low power mode and method of operating a display device

DC-DC converter with slave operation during high input voltage

A direct current to direct current converter includes a first voltage converting circuit which converts an input voltage into a first power supply voltage, a control block which stores information about voltage levels of a second power supply voltage, receives an external control signal, and generates a voltage level selection signal indicating a first one of the voltage levels, a second voltage converting circuit which converts the input voltage into the second power supply voltage having the first one indicated by the voltage level selection signal, and an abnormal state detector which detects an abnormal state of a display panel, and provides a current limit signal to the control block when the abnormal state is detected. In response to the current limit signal, the control block generates the voltage level selection signal indicating a second one of the voltage levels regardless of the external control signal.

Growing community of inventors

Suwon-si, South Korea

Sungchun Park