The disclosure provides a pixel circuit and a driving method thereof, a driving circuit, and a display device, which pertains to the field of pixel driving technology. The pixel circuit includes a capacitor, a capacitor charging transistor, a first and second capacitor discharging transistor. The capacitor is charged to a first voltage greater than the pixel voltage when the capacitor charging transistor is turned on. The capacitor is connected in series with the first and second capacitor discharging transistor to form a discharge circuit, and the capacitor is discharged when the first and second capacitor discharging transistor are turned on so that the voltage across the capacitor drops from the first voltage to the pixel voltage. There is no need to arrange a Gamma resistor for the driving circuit for the pixel circuit array provided by the disclosure, which makes the structure simple and the power consumption in driving low.

A gamma measurement method of a display device includes: storing a current value that is measured during gamma tuning of a display panel; resetting a target current of global current management (GCM) by referring to the current value; and measuring gamma of the display panel while applying the target current of the GCM.

A display device includes an afterimage compensator generating output grayscales by applying at least one of first and second weights to input grayscales when the input grayscales correspond to a still image, and pixels displaying an image based on the output grayscales. The afterimage compensator applies the first weight having an initial value greater than 1 to the input grayscales of a first group, and converges the first weight to 1, and applies the second weight having initial values less than 1 to the input grayscales of a second group, and converges the second weights to 1.

Methods and apparatuses relating to controlling an emission of a display panel. In one embodiment, a display driver hardware circuit includes row selection logic to select a number of rows in an emission group of a display panel, wherein the number of rows is adjustable from a single row to a full panel of the display panel, column selection logic to select a number of columns in the emission group of the display panel, wherein the number of columns is adjustable from a single column to the full panel of the display panel, and emission logic to select a number of pulses per data frame to be displayed, wherein the number of pulses per data frame is adjustable from one to a plurality and a pulse length is adjustable from a continuous duty cycle to a non-continuous duty cycle.

Methods and systems for generating dynamic picture metadata are presented. Given an input picture generated on a mastering display, characteristics of a target display which is different than the mastering display, and an initial set of dynamic metadata for the input picture, an iterative algorithm: maps the input image to a mapped image for the target display according to a display management process and the image metadata, compares the input image to the mapped image according to a visual appearance-matching metric, and updates the image metadata using an optimization technique until a visibility difference value between the input image and the mapped image according to the visual appearance-matching metric is below a threshold.

A display device includes: a first subpixel including a quantum dot light-emitting layer configured to emit light of a first color: a second subpixel including a quantum dot light-emitting layer configured to emit light of a second color different from the light of the first color: a third subpixel including a quantum dot light-emitting layer configured to emit light of a third color different from the light of the first color and the light of the second color: and a data processing circuit configured to receive a first input data corresponding to the first subpixel, a second input data corresponding to the second subpixel, and a third input data corresponding to the third subpixel. The data processing circuit generates first output data corresponding to a first data voltage supplied to the first subpixel by using the first input data, the second input data, and the third input data.

In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

The image display device includes an input unit that receives image data, a display unit that displays the image data received by the input unit, a receiving unit that receives drawing data drawn on the image data displayed on the display unit, an output unit that outputs the image data to another device, and a computing unit. The computing unit performs specific image adjustment on the image data, and causes the display unit to display the image data without performing the specific image adjustment on the image data when the specific image adjustment has been performed on the image data received by the input unit.

A method and device of compensating a brightness for a display device and a method and device of driving a display device are provided. The method of compensating a brightness includes: acquiring display brightness data of multiple frames of pictures displayed after a display picture of the display device is switched from a first grayscale value to a second grayscale value; determining a brightness coefficient of each frame of picture according to the display brightness data; determining a reference picture and at least one frame of to-be-compensated picture according to the brightness coefficient; and determining a grayscale compensation value, so that a ratio of a display brightness of each frame of to-be-compensated picture displayed by the display device to a display brightness of the reference picture displayed by the display device is greater than or equal to a preset first brightness threshold.

An electronic device includes a display layer, a data driving circuit, a scan driving circuit, a driving controller, and a temperature sensor which measures a temperature of the display layer to generate temperature data. The driving controller includes a first lookup table calculating unit which calculates a first lookup table based on the image signal, the temperature data, and a reference lookup table set for each of a plurality of gray levels, a luminance compensating unit which calculates a luminance weight based on luminance data, and a second lookup table calculating unit which calculates a second lookup table based on the first lookup table and the luminance weight, and the driving controller generates the image data based on the image signal and the second lookup table.