Abstract: A security device includes a summing circuit configured to receive a key signal and generate a merged signal by summing a lock signal and the key signal, a check voltage generating circuit configured to generate a check voltage having a voltage level corresponding to a duration of an on-period of the merged signal, and a check circuit configured to check whether the merged signal exceeds a comparison voltage, to check whether the check voltage is within a normal check voltage range, and to generate an OK signal having an on-level if the merged signal does not exceed the comparison voltage and the check voltage is within the normal check voltage range.

Abstract: An electronic device includes: a display panel including a pixel; a panel driver configured to drive the display panel in response to a power-on signal; and a power manager configured to apply a power voltage to the panel driver in response to a power voltage start signal, wherein the panel driver includes a voltage generator configured to output a first power voltage to the display panel based on the power voltage, wherein the voltage generator and the power manager are connected through a voltage line, wherein the voltage generator is configured to output a drop voltage to the voltage line in response to a voltage drop start signal, and wherein based on the power voltage being output to the voltage line, voltage generator is configured to output the drop voltage to the voltage line.

Abstract: Disclosed is a driving controller of an electronic device including a memory that stores the input image signal and outputs a previous image signal, a counter circuit that counts up a count value when the previous image signal corresponds to a black grayscale, and outputs a count value, a gain calculator that outputs a gain in response to the count value, and a compensation unit that outputs an image data signal based on the input image signal and the gain when the previous image signal corresponds to the black grayscale.

Abstract: A display device comprises a display panel including pixels, a panel current sensor configured to sense a panel current of the display panel, and generate an overcurrent alert signal when the panel current is greater than a limit current, a driving controller configured to generate an overcurrent prevention enable signal for determining whether to turn on an overcurrent prevention mode based on the overcurrent alert signal, and an initialization voltage generator configured to control an initialization voltage applied to the pixels in response to the overcurrent prevention enable signal.

Abstract: A display device includes a display panel including a plurality of pixels, a power management circuit which supplies a power supply voltage to the plurality of pixels through a power supply line, a current sensing circuit which generates a digital current code by sensing a panel current flowing through the power supply line, and a controller which determines a peak gray level and a panel load by analyzing input image data, determines a voltage level of the power supply voltage based on the peak gray level and the panel load, and sets a conversion time, during which the panel current is converted into a digital current code, based on the voltage level of the power supply voltage.

Abstract: A display device may include a display panel, a gate driving circuit, a data driving circuit, a driving voltage supplying circuit, and a driving control circuit that controls the gate driving circuit, the data driving circuit, and the driving voltage supplying circuit. The driving voltage supplying circuit supplies a gate driving voltage, a data driving voltage, and a panel driving voltage including a first power supply voltage and a second power supply voltage lower than the first power supply voltage. The driving control circuit determines a scale factor based on a load of input frame data, generates output frame data by applying the scale factor to the input frame data, and determines the first power supply voltage and an input power supply voltage for generating the first power supply voltage based on a maximum grayscale of the input frame data and a load of the output frame data.

Abstract: A security device includes a summing circuit configured to receive a key signal and generate a merged signal by summing a lock signal and the key signal, a check voltage generating circuit configured to generate a check voltage having a voltage level corresponding to a duration of an on-period of the merged signal, and a check circuit configured to check whether the merged signal exceeds a comparison voltage, to check whether the check voltage is within a normal check voltage range, and to generate an OK signal having an on-level if the merged signal does not exceed the comparison voltage and the check voltage is within the normal check voltage range.

Abstract: A display device includes: a display panel including a plurality of pixels; a driving controller configured to generate output image data based on input image data; and a data driver configured to generate a data voltage based on the output image data, wherein the driving controller is configured to: determine a low grayscale range in which a minimum grayscale is a first reference grayscale and a maximum grayscale is a second reference grayscale based on a driving frequency; and determine an output ratio and an output order of first reference output image data corresponding to the first reference grayscale and second reference output image data corresponding to the second reference grayscale.

Abstract: A compensation lookup table generator includes a maximum power voltage determiner, a rush power reduction amount operator, an allowable current increase amount operator and a lookup table modifier. The maximum power voltage determiner is configured to determine a maximum power voltage based on a first lookup table, a peak gain setting value and a power voltage curve. The rush power reduction amount operator is configured to operate a rush power reduction amount based on the maximum power voltage and a rush power limit. The allowable current increase amount operator is configured to operate an allowable current increase amount based on the maximum power voltage and the rush power reduction amount. The lookup table modifier is configured to generate a second lookup table by modifying the first lookup table based on the peak gain setting value and the allowable current increase amount.

Abstract: A display device includes a display panel including a plurality of pixels, a power management circuit which supplies a power supply voltage to the plurality of pixels through a power supply line, a current sensing circuit which generates a digital current code by sensing a panel current flowing through the power supply line, and a controller which determines a peak gray level and a panel load by analyzing input image data, determines a voltage level of the power supply voltage based on the peak gray level and the panel load, and sets a conversion time, during which the panel current is converted into a digital current code, based on the voltage level of the power supply voltage.

Abstract: A display device includes a display panel, a power voltage generator, and a driving controller. The display panel displays a plurality of frame images based on input image data. The power voltage generator provides a power voltage to the display panel. The driving controller generates a load reference value based on a voltage level of the power voltage and a scale factor for adjusting grayscales of the plurality of frame images, generates at least one of a first signal or a second signal for controlling a power current by comparing the load reference value with a plurality of line loads associated with a plurality of line images, and performs at least one of a first operation for reducing the scale factor based on the first signal or a second operation for reducing the voltage level of the power voltage based on the second signal.

Abstract: Disclosed is a driving controller of an electronic device including a memory that stores the input image signal and outputs a previous image signal, a counter circuit that counts up a count value when the previous image signal corresponds to a black grayscale, and outputs a count value, a gain calculator that outputs a gain in response to the count value, and a compensation unit that outputs an image data signal based on the input image signal and the gain when the previous image signal corresponds to the black grayscale.

Abstract: A display device includes a display panel including pixels, and a panel driver configured to sequentially apply data voltages to the pixels on a row basis in an active period of a frame period, and to perform a sensing operation on at least one pixel of the pixels in a blank period of the frame period. Within the blank period, the panel driver applies a pre-charge data voltage to the at least one pixel after the sensing operation, and applies a previous data voltage to the at least one pixel after a predetermined time from a time point at which the pre-charge data voltage is applied.

Abstract: Provided is a display device comprising a display panel, a driving controller that receives an input image signal and outputs an image data signal, a voltage generator that generates a plurality of gamma voltages in response to a voltage control signal, and a data driving circuit that receives the plurality of gamma voltages and provides a data signal corresponding to the image data signal to the display panel. The driving controller operates between in a normal mode and in a power-saving mode. During the power-saving mode, the driving controller outputs the voltage control signal for changing voltage levels of the plurality of gamma voltages in response to the input image signal and a peak signal. At least one of the plurality of gamma voltages has a first voltage level during the normal mode and has a second voltage level lower than the first voltage level during the power-saving mode.

Abstract: A driving controller includes a voltage determination block to analyze a grayscale of an input image signal, and to output a voltage signal according to the analyzed grayscale, a power luminance controller to calculate a load of the input image signal, an overcurrent-reference-setting block to output an overcurrent reference value based on the voltage signal and the load, a current-sensing-and-overcurrent-determining unit to receive a feedback current signal, to compare a current level of the feedback current signal with the overcurrent reference value, and to output a first signal, and a voltage controller to output a voltage control signal for setting a voltage level of a first driving voltage based on the voltage signal and the first signal, wherein the overcurrent-reference-setting block outputs the overcurrent reference value based on a current error corresponding to the voltage level indicated by the voltage signal, and a maximum current corresponding to the load.

Abstract: A display device includes a display panel, a power voltage generator, and a driving controller. The display panel displays a plurality of frame images based on input image data. The power voltage generator provides a power voltage to the display panel. The driving controller generates a load reference value based on a voltage level of the power voltage and a scale factor for adjusting grayscales of the plurality of frame images, generates at least one of a first signal or a second signal for controlling a power current by comparing the load reference value with a plurality of line loads associated with a plurality of line images, and performs at least one of a first operation for reducing the scale factor based on the first signal or a second operation for reducing the voltage level of the power voltage based on the second signal.

Abstract: A display device includes a display panel including a plurality of pixels, a power management circuit which provides a power voltage to the plurality of pixels through a power line, a current sensing circuit which senses a panel current flowing through the power line and performs an analog-to-digital conversion for converting the panel current into a panel current code, and a controller which sets at least one of a conversion range, a conversion time, or a conversion sampling count of the analog-to-digital conversion based on a dimming value for controlling a luminance of an image displayed by the display panel.

Abstract: A display device comprises a display panel including pixels, a panel current sensor configured to sense a panel current of the display panel, and generate an overcurrent alert signal when the panel current is greater than a limit current, a driving controller configured to generate an overcurrent prevention enable signal for determining whether to turn on an overcurrent prevention mode based on the overcurrent alert signal, and an initialization voltage generator configured to control an initialization voltage applied to the pixels in response to the overcurrent prevention enable signal.

Abstract: A compensation lookup table generator includes a maximum power voltage determiner, a rush power reduction amount operator, an allowable current increase amount operator and a lookup table modifier. The maximum power voltage determiner is configured to determine a maximum power voltage based on a first lookup table, a peak gain setting value and a power voltage curve. The rush power reduction amount operator is configured to operate a rush power reduction amount based on the maximum power voltage and a rush power limit. The allowable current increase amount operator is configured to operate an allowable current increase amount based on the maximum power voltage and the rush power reduction amount. The lookup table modifier is configured to generate a second lookup table by modifying the first lookup table based on the peak gain setting value and the allowable current increase amount.

Abstract: A display device includes a display panel including a pixel and panel driver configured to apply an initialization voltage to the pixel in a first pre-charge period included in an active period of a frame period, to apply a data voltage to the pixel, to perform a sensing operation to the pixel in a sensing period included in a blank period of the frame period, to apply the initialization voltage to the pixel in a second pre-charge period included in the blank period and to apply a previous data voltage to the pixel in a previous frame writing period included in the blank period. The panel driver may change one of a length of the first pre-charge period and a length of the second pre-charge period based on a frame rate.