121results about How to "Compensation Threshold Voltage" patented technology

In a pixel of a display device, a first transistor of which an second terminal is connected to a first terminal of a light emitting element supplies a driving current that corresponds to a voltage between a control terminal and the second terminal to the light emitting element, and a second terminal of the light emitting element is connected to a driving voltage. At least one second transistor transmits a black voltage that corresponds to a black gray to the control terminal of the first transistor in a first period and a second period, and transmits a gray voltage that corresponds to an input image signal to the control terminal of the first transistor in a third period. A third transistor is connected between the first terminal of the light emitting element and a voltage supply line to transmit a reference voltage, and the third transistor is turned on in the first period and turned off in the second period. A capacitor is connected between the control terminal and the source of the first transistor, stores a control voltage based on a threshold voltage of the first transistor in the second period, and stores a voltage based on the control voltage and the gray voltage in the third period.

The invention provides an electronic circuit, a driving method for an electronic circuit, an electro-optical device, a driving method for an electro-optical device, and an electronic apparatus which can reduce the dispersion of the threshold voltages of transistors. A driving transistor, first and second switching transistors, an adjustment transistor, a coupling capacitor, and a holding capacitor form a pixel circuit. The threshold voltage of the adjustment transistor is applied to the gate of the driving transistor. According to the present invention, the luminance gradation of a display element, such as an organic EL element, can be precisely controlled according to a data voltage.

An organic light emitting display device includes a scan driver, a data driver, and pixels. The scan driver is for sequentially supplying, during each horizontal period of a width 1H, a scan signal with a width of at least 2H to scan lines. The scan driver is further for sequentially supplying an emission control signal to emission control lines that are substantially parallel to the scan lines. The data driver supplies data signals to data lines. Each pixel includes an organic light emitting diode (OLED), a pixel circuit having a first transistor for controlling the amount of current supplied to the OLED, and a compensator for controlling the voltage of a gate electrode of the first transistor for compensating a degradation of the OLED. The compensator includes two transistors and a capacitor. One transistor is coupled to a scan line, and the other is coupled to an emission control line.

The invention provides a pixel circuit. The pixel circuit includes a driving transistor and a light-emitting element which are connected in series between a first electric level end and a second electric level end, and as well a second transistor, a third transistor, a fourth transistor, a first capacitor and a second capacitor, wherein the second capacitor is connected between the control pole of the driving transistor and the second end of the light-emitting element. Threshold voltage is stored through the first capacitor, so that threshold voltage compensation of the driving transistor and the light-emitting element can be realized, and therefore, the nonuniformity of the display of the pixel circuit can be compensated. According to the above pixel circuit, the invention also provides a display device. According to the display device, a first control line and a light-emitting control line are both global lines. The invention further discloses a pixel circuit driving method.

A pixel, a display device using the same, and a driving method thereof are disclosed. According to exemplary embodiments of the pixel, the display device including the same, and the driving method thereof, sufficient time to compensate the threshold voltage of the driving transistor of the pixel may be obtained under high resolution and high frequency driving to realize a display device of high image quality.

A non-volatile memory device includes a memory cell array at least one block having a plurality of memory cells, and at least one reference cell with respect to each block, an X decoder and a Y decoder for selecting a memory cell for an operation according to an input address, a page buffer for programming data into a memory cell selected by the X decoder and the Y decoder or reading programmed data, and a controller for controlling the memory cell array, the X decoder, the Y decoder and the page buffers to calculate a change in a threshold voltage of the memory cells and compensate for a changed threshold voltage of a memory cell based on a change in a threshold voltage of the reference cell.

An organic light emitting display includes a display unit including pixels coupled to scan lines, first control lines, second control lines, and data lines, a control line driver configured to supply a first control signal and a second control signal to the pixels through the first control lines and the second control lines, a first power source driver for applying a first power to the pixels of the display unit, and a second power source driver for applying a second power to the pixels of the display unit. At least one of the first power or the second power is applied to the pixels of the display unit as voltage values having different levels during one frame. The first and second control signals and the first and second powers are concurrently provided to all of the pixels of the display unit.

An organic light emitting display that can minimize degradation of a drive transistor comprising a first switching element whose control electrode is electrically coupled to a scan line, being electrically coupled between a data line and a first voltage line for transmitting a data signal; a drive transistor whose control electrode is electrically coupled to the first switching element, being electrically coupled between the first and second voltage lines; an organic light emitting diode electrically coupled to the drive transistor, displaying an image by a current supplied through the drive transistor; a first capacitive element electrically coupled between the control electrode of the drive transistor and the first switching element; a second capacitive element electrically coupled between the first capacitive element and the second voltage line; a second switching element electrically coupled between the first voltage line and the control electrode of the drive transistor; a third switching element electrically coupled between the first switching element and the drive transistor; a fourth switching element electrically coupled between the control electrode of the drive transistor and the second voltage line; and a fifth switching element electrically coupled between the drive transistor and the second voltage line.

Disclosed are a method of driving a display panel and a display apparatus using the same, in which a driving voltage is applied to a transistor provided in each pixel of the display to drive the transistor. A voltage level of the driving voltage applied to the transistor is adjusted every predetermined period and the changed driving voltage is applied to the transistor to prevent the operational reliability of the transistor from being lowered by a shift in the threshold voltage of the transistor.

A pixel includes: an organic light emitting diode coupled between a first power supply and a second power supply; a first transistor coupled between the organic light emitting diode and the second power supply; a second transistor coupled to a first node to which a gate electrode of the first transistor is coupled; a first capacitor coupled between the first node and a second node; a third transistor coupled between the second node and a data line; a fourth transistor coupled between the first node and the second node; a fifth transistor coupled between the first transistor and the second power supply; and a second capacitor coupled between the second node and a third node between the first transistor and the fifth transistor.

The invention provides a pixel cell driving circuit, a pixel cell driving method, a pixel cell and a display device. The pixel cell driving circuit comprises a driving thin film transistor, a matching thin film transistor, a signal clearing thin film transistor, a charge control unit, a driving control unit and a storage capacitor, wherein a grid electrode of the driving thin film transistor is connected with a first end of the storage capacitor and is connected with a driving power source through the charge control unit, a source electrode of the driving thin film transistor is connected with the driving power source, a drain electrode of the driving thin film transistor is connected with an OLED (organic light emitting diode), the matching thin film transistor is connected with a data line through the charge control unit, a source electrode of the matching thin film transistor and the signal clearing thin film transistor are respectively connected with a second end of the storage capacitor, and a source electrode of the signal clearing thin film transistor is connected with a grid electrode and a drain electrode of the matching thin film transistor and is connected with the data line through the charge control unit. By the aid of the pixel cell driving circuit, the pixel cell driving method, the pixel cell and the display device, brightness uniformity of an OLED panel an be improved.

A pixel including: an organic light emitting diode; a first transistor configured to control an amount of current that passes through the organic light emitting diode to flow to a second power from a first power that is connected to a first electrode of the first transistor corresponding to a voltage of a first node; a second transistor between a data line and the first node; a third transistor between the first node and a reference power; a fourth transistor between a second node and an initialization power, the second node being connected to an anode electrode of the organic light emitting diode; a first capacitor; and a second capacitor connected in series to the first capacitor, the first and second capacitors being between the first node and the first power.

In one embodiment of the present invention, capacitors are provided in series between the source and gate of a transistor which is a driver TFT. A predetermined voltage is applied to contact of the capacitors in a first period so as to apply a data voltage to the gate of the transistor from a source line. In a second period, the transistor is threshold compensated. The contact of the capacitors is opened in the third period, thereby short-circuiting the capacitor to apply a voltage having been subjected to threshold compensation to a point between the gate and source of the transistor. This pixel circuit structure, in which the driver TFT driving an OLED or another current-driven-type display element is threshold compensated, contains a reduced number of elements per pixel to increases the number of display pixels.

The invention provides a data drive circuit, an electric compensation method, an array substrate and a display device. The method comprises the steps: acquiring a threshold value voltage signal of pixel of a row and a column by virtue of a first signal wire connected to the row of pixels when a first scanning signal of the pixels is received; converting the threshold value voltage signal to obtain a compensation voltage signal according to an external control signal corresponding to the pixels of the row and the column; receiving a data voltage signal of the pixels of the row and the column from a time sequence control circuit; adding the compensation voltage signal together with the data voltage signal to obtain an output voltage signal; and outputting the output voltage signal to the pixels of the row and the column by virtue of a second signal wire connected to the pixels while a second scanning signal of the pixels is received. By adopting the method, the problems in the prior art that the effect for compensating the threshold value voltage of an internal circuit of the pixel is limit, and the design complexity of a TCON board is caused by an external circuit can be solved.

A pixel capable of displaying an image with uniform brightness, the pixel including an organic light emitting diode, a first transistor to control an amount of current supplied from a first power source coupled to a first electrode to the OLED, a second transistor coupled between a data line and a third node to be turned on when a first scan signal is supplied to a first scan line, a first capacitor coupled between the gate electrode of the first transistor and a second node, a sixth transistor coupled between the second node and the third node to be turned off when an emission control signal is supplied to an emission control line, a second capacitor coupled between the third node and the first power source, a fifth transistor coupled between the first power source and the second node to be turned on when the first scan signal is supplied to the first scan line, and a fourth transistor coupled between a second electrode of the first transistor and the data line to be turned on when a second scan signal is supplied to a second scan line.

To provide a display device which can ensure high reliability of a driver circuit even when a threshold voltage of a TFT shifts. The display device includes a power supply control circuit which can apply a forward bias voltage or a reverse bias voltage to a gate of a transistor included in an output circuit, a monitor transistor which is formed to monitor the amount of change of a threshold voltage of the transistor included in the output circuit, and a threshold control circuit which controls the power supply control circuit so as to apply the reverse bias voltage to the gate of the transistor in order to compensate the threshold voltage of the transistor included in the output circuit.

A display device includes luminescence pixels arranged in rows and columns. Each of gate lines and reset lines correspond to one of the rows, and signals lines each correspond to one of the columns. Each luminescence pixels includes a luminescence element, a switching transistor, a drive transistor which supplies current to the luminescence element, and a reset transistor. The reset transistor includes a gate terminal connected to a corresponding reset line, one of a source and drain terminal connected to a source or drain terminal of the drive transistor, and the other of the source and drain terminal connected to a corresponding gate line. A capacitor is connected between the gate terminal and the source terminal of the drive transistor.

An organic light emitting display device operates for an initializing period, a scan period and an emission period divided from one frame period. The organic light emitting display device includes: a data driver for supplying data signals to output lines; a connecting unit for selectively coupling a data line of data lines to a corresponding one of the output lines or an initial power supply, and being positioned between the output lines and the data lines; a second power driver for applying second power having a low level and a high level to pixels positioned at crossing regions of scan lines and the data lines; and a first control line commonly coupled to the pixels, in which each of the pixels includes an organic light emitting diode, and an anode electrode of the organic light emitting diode is supplied with a voltage of the initial power supply for the initializing period.

The invention provides a pixel driving circuit and a pixel driving method. According to the pixel driving circuit, a 6T1C structure is used in cooperation with a specific driving time sequence, and therefore, the threshold voltage of a driving tube can be effectively compensated, current flowing through a light emitting device is not affected by the threshold voltage of the driving tube, the display uniformity of a panel can be improved, and the display effect of pictures can be improved. The structure of the circuit is simple, and therefore, efficiency can be improved.

In a pixel circuit of an organic EL display device, a gate of a driving transistor is coupled to a gate of a compensating transistor, which is configured to operate as a diode. A precharge voltage is applied to the gate of the driving transistor while a selection signal is applied to a previous scan line, so that the compensating transistor is biased in a forward direction to apply a data voltage on the gate of the drive transistor. The driving transistor may be electrically isolated from the organic EL element (OLED) while precharging, so as to prevent the OLED from emitting a light using the precharge voltage. In addition, the driving transistor may be electrically isolated from the OLED while the data voltage is being charged, so as to prevent the OLED from emitting a light.

Disclosed is an organic light emitting display device including a pixel connected to a data line, a gate line group, and a reference line. The pixel includes an organic light emitting diode (OLED), a driving transistor configured to control a current flowing in the OLED, a first switching transistor configured to selectively supply a data voltage to a first node, a second switching transistor configured to selectively supply an initial voltage to a second node, a third switching transistor configured to selectively connect a third node to the reference line, a fourth switching transistor configured to selectively connect the first node to the third node, a first capacitor connected between the first and second nodes to store a threshold voltage of the driving transistor, and a second capacitor connected between the first and third nodes to store the data voltage supplied through the first switching transistor.

A pixel and an organic light emitting device that can display an image having a desired luminance. The pixel includes an organic light emitting diode (OLED), first through third transistors, and a first capacitor. The OLED has a cathode electrode coupled to a second power source. The second transistor controls the current from a first power source to the OLED. The first capacitor has a first terminal coupled to a gate electrode of the second transistor. The first transistor is coupled between a second terminal of the first capacitor and a data line, and turns on when a scan signal is supplied to a scan line. The third transistor is coupled between the gate electrode and a second electrode of the second transistor, and turns on when a control signal is supplied to a control line. The third transistor remains turned on for a longer time than the first transistor.

The invention compensates for variations of a driving transistor Tr1. The invention provides a pixel circuit including a current-type driven element L, a driving transistor Tr1 to control the amount of electrical current to be supplied to the driven element, a capacitor element C connected to the gate of the driving transistor, a switching transistor Tr3 connected to the gate of the driving transistor, a switching transistor Tr1, a scanning line S connected to the gate of the switching transistor Tr3, a data line D connected to the source or the drain of the switching transistor Tr3, and a power-supply line V connected to a signal line via the switching transistor Tr3. A diode-connected compensating transistor Tr4 is disposed between the power-supply line V and the switching transistor Tr3.

A display panel and an electroluminescent display using the same are disclosed. The display panel includes a first data line charged with a first data signal, a second data line charged with a second data signal, a first subpixel connected to the first data line, a second subpixel connected to the second data line, a gate line commonly connected to the first and second subpixels and simultaneously supplying a gate signal to the first and second subpixels, a demultiplexer connecting an output terminal of a data driver to the first data line using MUX switch elements and then connecting the output terminal to the second data line using the MUX switch elements, and a switch array supplying a reference voltage to the second data line when the output terminal is connected to the first data line by the demultiplexer using REF switch elements.

An electronic circuit, a driving method for an electronic circuit, an electro-optical device, a driving method for an electro-optical device, and an electronic apparatus are provided to reduce the dispersion of the threshold voltages of transistors. A driving transistor, first and second switching transistors, an adjustment transistor, a coupling capacitor, and a holding capacitor form a pixel circuit. The threshold voltage of the adjustment transistor is applied to the gate of the driving transistor. According to various embodiments, the luminance gradation of a display element, such as an organic EL element, can be precisely controlled according to a data voltage.

A pixel having a simplified structure can compensate for the threshold voltage of a driving transistor thereof. The pixel includes an organic light emitting diode (OLED) having a cathode electrode coupled to a second power source, a storage capacitor coupled between a data line and a first node, a second transistor having a first electrode coupled to a first power source, a second electrode coupled to an anode electrode of the OLED, and a gate electrode coupled to the first node, a first transistor coupled between the first node and the second electrode of the second transistor, a gate electrode of the first transistor being coupled to a current scan line, and a third transistor coupled between the second electrode of the second transistor and the anode electrode of the OLED, a gate electrode of the third transistor being coupled to a control line.

The invention discloses a novel active matrix / organic light emitting diode (AMOLED) pixel driving circuit. The structure of the circuit is beneficial for being tested by a digital testing module composed of an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a controller and other modules, and carries out compensation for threshold voltage excursion caused by the aging of a driving tube. The novel AMOLED pixel driving circuit has three advantages of carrying out automatic compensation for the threshold voltage excursion caused by the aging of the driving tube, being capable of testing the threshold voltage compensation effect of the driving tube after the manufacturing of the driving tube is completed, and being capable of extracting the threshold voltage in real time matched with external equipment and providing a basis for carrying threshold compensation with various methods.