A display, a circuit arrangement for a display and a method of operating a circuit arrangement of a display are disclosed. In an embodiment a display includes a plurality of light emitters arranged in a plurality of rows and columns, each row including an electric line and each column including an electric line, a voltage supply for providing a first voltage level to the electric lines of the rows and a second voltage level to the electric lines of the columns and a light emitter arranged in a first row and a first column and interconnecting the electric line of the first row and the electric line of the first column, wherein the electric line of the first column includes a current source, the current source being adapted to be switched on and off and to provide an electric current to drive the light emitter.

A display, a circuit arrangement for a display and a method of operating a circuit arrangement of a display are disclosed. In an embodiment a display includes a plurality of light emitters arranged in a plurality of rows and columns, each row including an electric line and each column including an electric line, a voltage supply for providing a first voltage level to the electric lines of the rows and a second voltage level to the electric lines of the columns and a light emitter arranged in a first row and a first column and interconnecting the electric line of the first row and the electric line of the first column, wherein the electric line of the first column includes a current source, the current source being adapted to be switched on and off and to provide an electric current to drive the light emitter.

A display apparatus and a compensation circuit are provided. The display apparatus includes a display screen, a sound reproduction device and a power supply circuit. The power supply circuit includes a rectifier circuit and a compensation circuit. The rectifier circuit is used to convert an alternating current to a direct current. The compensation circuit is used to compensate for a parasitic signal of a synchronous rectification MOSFET in the rectifier circuit, thereby reducing heat generated by the MOSFET.

A driver for an electrically dynamic structure may store and release energy during polarity cycling to improve the energy efficiency of operation. In some examples, the driver includes an energy storage element. In operation, the driver can charge an electrically controllable optically active material to a first operating voltage at a first polarity and subsequently discharge the optically active material during polarity reversal. The driver may store energy released from the optically active material during discharging and subsequently release the energy to charge the optically active material to a second operating voltage at a second polarity different than the first polarity.

The present invention provides a display device (smartphone (3)) that realizes less power consumption for refreshing a video. The smartphone (3) includes: a host (2) configured to obtain image data which is to be supplied to an LCD panel (31); and a driver (32) configured to transmit, to the LCD panel (31), the image data so as to refresh a video which is displayed by the display panel, the driver (32) being configured to refresh a video, displayed on an extended region (312), at a refresh rate lower than that at which the driver (32) refreshes data displayed on a main region (311).

Methods and apparatus relating to techniques to provide dynamic pixel density adjustment for display panels not driven by backlight are described. In an embodiment, logic causes a first plurality of pixels of a display panel to be turned off in response to an indication that a charge level of a power supply, coupled to supply electrical power to the display panel, has dropped below a threshold level. The display panel is not backlight drive (such as an OLED or QDOT display panels. Other embodiments are also disclosed and claimed.

A backlight unit of a display device includes a power converter to generate a light source voltage in response to a power control signal, a light emitting element connected between a first node and a second node, and a light source controller connected to the second node and to output the power control signal in response to a dimming signal. The light emitting element receives the light source power voltage through the first node. When a feedback voltage of the second node is lower than a first reference voltage, the light source controller outputs the power control signal having a first pulse width based on the feedback voltage and the dimming signal. When the feedback voltage is higher than the first reference voltage, the light source controller outputs the power control signal having a second pulse width based on a voltage lower than the feedback voltage and the dimming signal.

Methods and apparatus relating to techniques to provide dynamic pixel density adjustment for display panels not driven by backlight are described. In an embodiment, logic causes a first plurality of pixels of a display panel to be turned off in response to an indication that a charge level of a power supply, coupled to supply electrical power to the display panel, has dropped below a threshold level. The display panel is not backlight drive (such as an OLED or QDOT display panels. Other embodiments are also disclosed and claimed.

The present invention provides a driving circuit for display panel, which comprises a power supply circuit and a driving unit. The power supply circuit outputs a driving power supply voltage. The driving unit produces a driving signal according to a data signal and the driving power supply voltage for driving the display panel. In addition, the voltage level of the driving power supply voltage increases to a predetermined level. Thereby, during the process of charging the display panel by the data driving circuit, the driving power supply voltage output by the power supply circuit increases from a low level to a predetermined level for reducing the power consumption of the driving circuit.

A voltage converter includes a conversion unit, a self driver and an output unit. The conversion unit includes at least one inductor and provides a boosting power based on an input voltage and a first driving signal. The self driver includes at least one inductor that forms a magnetic coupling with the at least one inductor of the conversion unit. The self driver generates a second driving signal that is synchronized with the first driving signal through the magnetic coupling. The output unit generates an output voltage based on the boosting power and the second driving signal. Switching loss and conduction loss may be reduced by replacing an output diode with an output transistor and voltage spike and electromagnetic interference may be reduced through zero voltage switching. The driving signal of the output transistor may be controlled efficiently by adjusting the inductance of the driving inductor.