Abstract: According to an embodiment, a method for operating an electronic device may comprise operating touch circuitry configured to detect a touch or hovering according to a first driving signal in a first operation mode, detecting a first event related to mode switching, and operating the touch circuitry according to a second driving signal different from the first driving signal in a second operation mode based on detecting the first event. Other embodiments are also possible.

Abstract: There is provided a CMOS inverter circuit device. The CMOS inverter circuit device includes a delay circuit unit configured to generate different charge and discharge paths of each gate node of a PMOS transistor and an NMOS transistor respectively at the time that an input signal transitions between high and low levels. Therefore, the present examples minimize or erase generation of a short circuit current made at the time that the input signal transition. The examples may simplify circuit architecture, and may make a magnitude of a CMOS inverter circuit device smaller.

Abstract: A circuit for adjusting a frequency of an AC direct lighting apparatus is provided. The circuit may include a reference voltage generation unit configured to receive a dimming voltage having a first frequency and a first voltage range, and generate a reference voltage having a second voltage range, a sensing section determining unit configured to generate first and second section reference voltages based on the reference voltage, and determine a driving current sensing section using the first and second section reference voltages, and a driving signal generation unit configured to generate a switching device driving signal having a second frequency through the determined driving current sensing section.

Abstract: According to an embodiment, a method for operating an electronic device may comprise operating touch circuitry configured to detect a touch or hovering according to a first driving signal in a first operation mode, detecting a first event related to mode switching, and operating the touch circuitry according to a second driving signal different from the first driving signal in a second operation mode based on detecting the first event. Other embodiments are also possible.

Abstract: A electronic device includes a display for outputting an input area related to operation of an electronic pen in response to occurrence of a specified event related to the electronic pen, and a processor configured to process a function related to the operation of the electronic pen corresponding to a specific event that occurs on the basis of the input area. An electronic device includes a display comprising an input area for receiving an event for configuring an execution attribute of an electronic pen, and a processor configured to change the execution attribute of the electronic pen if the event is detected through the input area.

Abstract: A detection circuit configured to detect a short in a plurality of LED arrays is provided. The detection circuit includes a voltage measuring unit, a short detecting unit, and a detection control unit. The voltage measuring unit is configured to measure respective feedback voltages of the plurality of LED arrays and output a lowest measured feedback voltage as a first feedback voltage. The short detecting unit is configured to detect the short in the LED arrays using the measured feedback voltages. The detection control unit is configured to control the short detecting unit to stop short detection operation, when the first feedback voltage exceeds a first preset reference voltage.

Abstract: A Light Emitting Diode (LED) driver apparatus and a method of driving an LED array are provided. A Light Emitting Diode (LED) driver apparatus includes: a DC-DC converter configured to supply a driving voltage to an LED array, a plurality of LED drivers configured to drive the LED array according to a dimming signal, in which the plurality of LED drivers are connected to one another in parallel to supply currents to the LED array.

Abstract: A level shifting circuit includes a transistor output unit that receives a first power supply signal and convert the first power supply signal to a second power supply signal having a different level from the first power supply signal and a current provision unit that provides a current to an output terminal of the transistor output unit when the first power supply signal of the transistor output unit is inputted to shorten a prolonged portion of the second power supply signal. Therefore, the level shifting circuit may provide an additional current to the output terminal of the transistor output unit to shorten a prolonged portion of the output voltage.

Abstract: There is provided a CMOS inverter circuit device. The CMOS inverter circuit device includes a delay circuit unit configured to generate different charge and discharge paths of each gate node of a PMOS transistor and an NMOS transistor respectively at the time that an input signal transitions between high and low levels. Therefore, the present examples minimize or erase generation of a short circuit current made at the time that the input signal transition. The examples may simplify circuit architecture, and may make a magnitude of a CMOS inverter circuit device smaller.

Abstract: A detecting circuit and method thereof are configured to detect whether an LED array is open is described. The detecting circuit includes a resistance unit, a first switching unit, and an output unit. The resistance unit is operatively connected in series to the LED array. The switching unit is configured to be turned on when a voltage of the resistance unit is greater than or equal to a predetermined voltage level. The output unit is configured to produce an output indicative of whether the LED array is open, based whether the first switching unit is turned on.

Abstract: A light-emitting diode (LED) driver apparatus is provided. The LED driver apparatus includes a pulse width modulation (PWM) signal generating unit, a DC-DC converter, and a comparison voltage generating unit. The PWM signal generating unit generates a PWM signal according to a comparison voltage. The DC-DC converter supplies a driving voltage of an LED array by using the PWM signal. The comparison voltage generating unit measures a feedback voltage of the LED array and supplies a difference between the measured feedback voltage and a target voltage as a comparison voltage to the PWM signal generating unit. The comparison voltage generating unit supplies a second reference voltage as a comparison voltage to the PWM signal generating unit from a time when the driving voltage is higher than or equal to a first reference voltage to a time when the driving voltage reaches the target voltage.

Abstract: A level shifting circuit includes a transistor output unit that receives a first power supply signal and convert the first power supply signal to a second power supply signal having a different level from the first power supply signal and a current provision unit that provides a current to an output terminal of the transistor output unit when the first power supply signal of the transistor output unit is inputted to shorten a prolonged portion of the second power supply signal. Therefore, the level shifting circuit may provide an additional current to the output terminal of the transistor output unit to shorten a prolonged portion of the output voltage.

Abstract: A light emitting diode (LED) driver apparatus includes a pulse-width modulation (PWM) signal generator configured to generate a PWM signal according to a reference voltage. The LED driver apparatus also includes a DC-DC converter configured to provide a driving voltage to LED arrays based on the generated PWM signal, and a LED driver configured to drive the LED arrays through output ports. The LED apparatus includes a detector configured to detect whether the LED arrays are operatively connected to the corresponding output ports.

Abstract: A electronic device includes a display for outputting an input area related to operation of an electronic pen in response to occurrence of a specified event related to the electronic pen, and a processor configured to process a function related to the operation of the electronic pen corresponding to a specific event that occurs on the basis of the input area. An electronic device includes a display comprising an input area for receiving an event for configuring an execution attribute of an electronic pen, and a processor configured to change the execution attribute of the electronic pen if the event is detected through the input area.

Abstract: A circuit for adjusting a frequency of an AC direct lighting apparatus is provided. The circuit may include a reference voltage generation unit configured to receive a dimming voltage having a first frequency and a first voltage range, and generate a reference voltage having a second voltage range, a sensing section determining unit configured to generate first and second section reference voltages based on the reference voltage, and determine a driving current sensing section using the first and second section reference voltages, and a driving signal generation unit configured to generate a switching device driving signal having a second frequency through the determined driving current sensing section.

Abstract: A Light Emitting Diode (LED) driving apparatus and a method of driving a LED backlight unit are provided. An LED driving apparatus includes: an input unit configured to receive a dimming signal, an extension unit configured to extend ON time of the inputted dimming signal, an LED driving unit configured to drive an LED array using the extended dimming signal, and a detection unit configured to detect a degradation of the LED array by measuring a forward voltage between the LED array and the LED driving unit.

Abstract: A LED driving circuit having a sensing unit is disclosed. The LED driving circuit includes an input unit configured to receive a dimming signal to drive an LED array, a DC-DC converter including a power transistor configured to perform a switching operation, the DC-DC converter being configured to provide an output voltage to the LED array by the switching operation, a PWM signal generating unit configured to provide a PWM signal to adjust power of the LED array to the power transistor, a LED driving unit configured to drive the LED array using the dimming signal, and a sensing unit configured to sense degradation of the power transistor.

Abstract: Provided are a ramp circuit and a DC-DC converter. The ramp circuit generates a current flowing in a resistor using voltages affected by an output voltage and an input voltage of a DC-DC converter, and generates a ramp signal through copying of the current and charging and discharging of a capacitor using a current mirror unit. The ramp signal is generated by considering the input voltage and the output voltage, and thus the ramp signal has an optimal slope to provide an adaptive response to state change in the input voltage and the output voltage. The DC-DC converter uses such a ramp circuit to facilitate its operation.

Abstract: There is provided a CMOS inverter circuit device. The CMOS inverter circuit device includes a delay circuit unit configured to generate different charge and discharge paths of each gate node of a PMOS transistor and an NMOS transistor respectively at the time that an input signal transitions between high and low levels. Therefore, the present examples minimize or erase generation of a short circuit current made at the time that the input signal transition. The examples may simplify circuit architecture, and may make a magnitude of a CMOS inverter circuit device smaller.

Abstract: A Light Emitting Diode (LED) driver circuit and a Pulse Width Modulation (PWM) controlling circuit thereof is provided. The LED driver circuit includes a voltage detector connected to a plurality of LED arrays, the voltage detector being configured to determine a connection status of each of the LED arrays according to a level of a feedback voltage of each of the LED arrays, and detect a minimum feedback voltage from the feedback voltage of each of the LED arrays that are determined to be connected, a controller configured to output a control signal to control boosting of the LED arrays according to the detected minimum feedback voltage, a PWM signal generator configured to output a PWM signal corresponding to the outputted control signal, and a driving voltage generator configured to supply a driving voltage commonly to the LED arrays according to the PWM signal.