Abstract: A pixel circuit has a light emitting diode, a first driving transistor, a second driving transistor, a capacitor, and a switch unit. When a scan signal is asserted, the switch unit couples sources/drains of the second driving transistor respectively to a first and a second source/drain of the first driving transistor, and couples a gate and second source/drain of the first driving transistor together. When the scan signal is de-asserted, the switch unit decouples one of the sources/drains of the second driving transistor from the first/second source/drain of the first driving transistor, and decouples the gate from the second source/drain of the first driving transistor.

Abstract: A pixel circuit has a light emitting diode, a driving transistor, a capacitor, a first switch, a second switch, a third switch, and a forth switch. The driving transistor has a drain, coupled to a second end of the light emitting diode. The capacitor is coupled between a gate of the driving transistor and the ground terminal. The third switch is coupled between the source and the gate of the driving transistor. The fourth switch is coupled between the second end of the light emitting diode and a data line. The first switch is off, the second is on, and the third is on during the reset period; the first switch is off, the second is off, and the third is on during the programming period; and the first switch is on, the second is on, and the third is off during the display period.

Abstract: A pixel circuit has a light emitting diode, a first driving transistor, a second driving transistor, a capacitor, and a switch unit. When a scan signal is asserted, the switch unit couples sources/drains of the second driving transistor respectively to a first and a second source/drain of the first driving transistor, and couples a gate and second source/drain of the first driving transistor together. When the scan signal is de-asserted, the switch unit decouples one of the sources/drains of the second driving transistor from the first/second source/drain of the first driving transistor, and decouples the gate from the second source/drain of the first driving transistor.

Abstract: An output stage circuit of a data driver for an display is provided. The circuit includes a current mirror having a first transistor and a current source on a reference current path, having a second transistor on an output current path, wherein the reference and output current paths are commonly coupled to a power line, a capacitor having a first end coupled to the power line and a second end coupled to a gate of the second transistor, a first switch cutting off the output current path during a first period, and a second switch coupling the second end of the capacitor to the current source during the first period.

Abstract: A pixel array comprising a plurality of pixel groups, wherein each pixel group comprises: A plurality of light emitting elements, a plurality of driving units, and a plurality of switching units. A plurality of driving units, each of which outputs drives currents for the light emitting elements in a convolution sequence. Each of switching units couples the output of one of the driving units to the light emitting elements in the convolution sequence.

Abstract: A driving circuit is provided by the invention. The driving circuit includes a level shifter, a buffer and a switch. The switch is coupled between an operation voltage and a power supply terminal of the first buffer for controlling a power-supplying time of the first buffer. While the level shifter is transiting, the switch is turned off, and the switch is turned on after the level shifter completes the transition. Therefore, the transition time of the level shifter is different from the transition time of the buffer so as to avoid simultaneously conducting large currents to adversely affect the transition capability of the level shifter.

Abstract: One embodiment of the invention includes an image compensation module, an OLED display panel, and an OLED display apparatus. A target current value corresponding to a target gray level is stored in a compensation memory portion. A reference gray level and a reference current value corresponding to the reference gray level are stored in a reference memory portion. A compensation gray level can be obtained by an arithmetic compensation unit according to the target current value, reference gray level, reference current value, and gamma parameter. This may reduce the memory space needed for the compensation and reference memory portions, and compensate the images of the display apparatus and panel so that precise colors can be displayed with a high image quality.

Abstract: A shift register circuit includes a latch unit, a leakage current control unit, and a first output unit. The latch unit outputs a latch signal in accordance with a clock signal and an input signal. The first output unit outputs an output signal in accordance with the latch signal. The leakage current control unit is electrically connected between the latch unit and the first output unit for outputting the latch signal to the first output unit in accordance with the clock signal.

Abstract: An OLED display and pixel circuit thereof are provided. The pixel circuit includes first and second switches, first and second PMOS transistors, a capacitor and an OLED. The first switch, controlled by a first scan signal, has a first end receiving a data signal and a second end. The second switch, controlled by a second scan signal, has a third end coupled to the second end and a fourth end. The first PMOS transistor has a source coupled to a high voltage, a drain coupled to the fourth end and a gate coupled to the second end. The second PMOS transistor has a gate coupled to the second end and a source coupled to the high voltage. The capacitor is coupled to the gate of the first PMOS transistor and the high voltage. The OLED has a positive end coupled to a drain of the second PMOS transistor.

Abstract: A driving circuit is provided by the invention. The driving circuit includes a level shifter, a buffer and a switch. The switch is coupled between an operation voltage and a power supply terminal of the first buffer for controlling a power-supplying time of the first buffer. While the level shifter is transiting, the switch is turned off, and the switch is turned on after the level shifter completes the transition. Therefore, the transition time of the level shifter is different from the transition time of the buffer so as to avoid simultaneously conducting large currents to adversely affect the transition capability of the level shifter.

Abstract: A gamma-voltage generation circuit is arranged to output groups of gamma voltages. The circuit has a resister string and several switches. The resistor string has several resistors connected in series and is grouped into several segments, wherein each of the segments provides one of the gamma voltages. The switches respectively couple to several nodes between the resistors in one of the segments. Wherein the switches are closed when one of the groups of the gamma voltages are output and the switches are opened when another one of the groups of the gamma voltages are output.

Abstract: A driving circuit is provided by the present invention. The driving circuit includes a level shifter, a buffer and a switch. The switch is coupled between the level shifter and the buffer. While the level shifter is transiting, the switch is turned off, and the switch is turned on after the level shifter completes the transition. Therefore, the transition time of the level shifter is different from the transition time of the buffer so as to avoid simultaneously conducting large currents to adversely affect the transition capability of the level shifter.

Abstract: A digital-to-analog converter (DAC) is provided for converting an (X+Y)-bit input word, which includes an X-bit MSB subword and a Y-bit LSB subword, into a current signal. The DAC has an X-bit voltage DAC section and a Y-bit current DAC section. The X-bit voltage DAC section generates an intermediate voltage corresponding to the X-bit MSB subword. The Y-bit current DAC section generates a reference current corresponding to the intermediate voltage and outputs the current signal derived by multiplying the reference current by a factor corresponding to the Y-bit LSB subword. In addition, a method for digital-to-analog conversion of an (X+Y)-bit input word into a current signal is also provided.

Abstract: The present invention discloses a method for driving a light emitting diode according to a required luminance, wherein an actual luminance of the light emitting diode decays with time and a correlation there between is represented by a life-time curve. The method comprises the following steps. First, the driving current is correlated with the required luminance by an initial coefficient is provided to the light emitting diode. Next, a length of a period of use of the light emitting diode is counted. Then, a slope of the life-time curve corresponding to the required luminance is stored. Finally, a new coefficient from the length of the period of use, the slope of the life-time curve and the initial coefficient is derived.

Abstract: A pixel circuit has a light emitting diode, a driving transistor, a capacitor, a first switch, a second switch, a third switch, and a forth switch. The driving transistor has a drain, coupled to a second end of the light emitting diode. The capacitor is coupled between a gate of the driving transistor and the ground terminal. The third switch is coupled between the source and the gate of the driving transistor. The fourth switch is coupled between the second end of the light emitting diode and a data line. The first switch is off, the second is on, and the third is on during the reset period; the first switch is off, the second is off, and the third is on during the programming period; and the first switch is on, the second is on, and the third is off during the display period.

Abstract: A driver including a first level shifter group and a second level shifter group is provided. The first level shifter group includes at least one first level shifter to receive a first input signal. The second level shifter group includes at least one second level shifter to receive a second input signal. The driver sequentially enables the first level shifter group and the second level shifter group to sequentially transfer voltage levels of the first input signal and the second input signal.

Abstract: A pixel circuit has a light emitting diode, a first switch, a driving transistor, a capacitor, and a second switch. The first switch has a first end coupled to the light emitting diode, wherein the first switch is controlled by a first scan signal. The driving transistor has source/drains respectively coupling to a first power source terminal and a second end of the first switch. The capacitor couples between a gate of the driving transistor and a second power source terminal. The second switch respectively couples the second end of the first switch to the capacitor, and couples the gate and the source/drain of the driving transistor together when a second scan signal is asserted.

Abstract: A data driver for an OLED display has a resistor string, digital-to-analog converters and converting transistors. The resistor string provides a set of gamma voltages. Each of the digital-to-analog converters converts an input word into an output voltage selected from the gamma voltages. Each of the converting transistors conducts a driving current and having a gate-to-source voltage determined by the output voltage from one of the digital-to-analog converters. A method of data driving for an OLED display is also disclosed.

Abstract: A display apparatus has several light emitting elements and several lenses. The light emitting elements generate light of a first and second part of a frame respectively during a first and second period. The lenses pass through by the light from the light emitting elements, and operate to form images of the first and second part of the frame at a first and second location during the first and second period, respectively.

Abstract: A display panel is disclosed. The display panel includes a data line, a scan line, a first switch connected to a first voltage, a second switch connected to a second voltage, and a pixel.