Abstract: An object of the invention is to convert input RGB data to R?G?B?W data without suffering loss of gradations of the input RGB data. A display panel 12 is configured having unit pixels made up of subpixels of RGBW (red, green, blue, white). In an RGB?R?G?B?W conversion section 10, conversion is carried out under conditions that usage rate of W is less than 100%, and a bit width of input RGB data us larger than a bit width of R?G?B?W data after conversion. In the RGB?R?G?B?W conversion section 10, R1G1B1values and W values are determined so that an absolute value of a sum of values obtained by multiplying differences between respective RGB data input and respective RGB components in R?G?B?W data after conversion by a weight, becomes minimum.

Abstract: The rate of reading from a memory for storing display irregularity correction data is lowered. At the time of display, calculation is carried out in a correction calculation section using an input signal and correction data in one or more memory units, and brightness inconsistency correction is carried out. The way in which correction calculation is carried out in the correction calculation section is changed for every frame.

Abstract: To alleviate an afterimage phenomenon caused by a hysteresis characteristic of a drive TFT, current driven type light emitting elements are provided for each of the pixels arranged in a matrix, and current through the light emitting elements is controlled using drive TFTs that operate by receiving a data voltage on a gate. At least two power supply voltages for supply to each pixel are provided, one being set to a voltage such that current corresponding to a data voltage flows in the drive TFT, the other being set to a voltage beyond a variation range of data voltage and that reverse biases the drive TFT, and the two power supply voltages are switched and supplied to each pixel.

Abstract: To alleviate an afterimage phenomenon caused by a hysteresis characteristic of a drive transistor. Current driven type light emitting elements 3 are provided for each of pixels 6 that are arranged in a matrix shape, and current of the light emitting elements 3 is controlled using drive TFTs 2 that operate by receiving data voltage on a gate. At least two power supply voltages (PVDDa, PVDDb) for supply to each pixel are provided, one being set to a voltage such that current corresponding to a data voltage flows in the drive TFT 2, the other being set to a voltage beyond a variation range of data voltage and that reverse biases the drive TFT 2, and the two power supply voltages are switched and supplied to each pixel 6.

Abstract: The rate of reading from a memory for storing display irregularity correction data is lowered. At the time of display, calculation is carried out in a correction calculation section using an input signal and correction data in one or more memory units, and brightness inconsistency correction is carried out. The way in which correction calculation is carried out in the correction calculation section is changed for every frame.

Abstract: The rate of reading from a memory for storing display irregularity correction data is lowered. At the time of display, calculation is carried out in a correction calculation section 12 using an input signal and correction data in RAM 22, and brightness inconsistency correction is carried out. The way in which correction calculation is carried out in the correction calculation section 12 is changed for every frame.

Abstract: There is provided a display device in which disadvantageous effects due to unnecessary operations of an image lag alleviating function are minimized. In a display device of active matrix type, for each of the pixels arranged in a matrix, a current-driven emissive element is provided, and the current of the emissive element is controlled using a drive TFT so as to perform display. While a black display period during which an opposite bias voltage is applied between the gate electrode and the source electrode of the drive TFT is inserted in order to alleviate image lag, this insertion is performed only when a predetermined condition is satisfied, and is performed for a certain duration according to a command by a microcomputer (10).

Abstract: Display unevenness is suppressed. A display device includes pixels (22) arranged in matrix, each including a current-driven type light emitting element (EL) and a drive transistor (Tr3) for supplying a current to the current-driven type light emitting element (EL). The current-driven type light emitting element (EL) is driven by dividing each frame period into a plurality of sub-frame periods for lighting time. The drive transistor is controlled under current write driving using two write currents having a ratio of 1:1/2N and a sum of the two write currents.

Abstract: To compensate for voltage drop on a power supply line. In a display device, pixel data is supplied to each of a plurality of pixels arranged in a matrix form and display is performed. Each pixel has a self-emissive element. A horizontal direction power supply line (horizontal direction PVDD) which supplies a power supply to each pixel is provided, and one end of the horizontal PVDD line is connected to a vertical power supply line (vertical PVDD line) that is connected to an external power supply terminal. Correction data corresponding to a voltage drop to the horizontal PVDD line due to a resistance in the vertical PVDD line is then obtained through a calculation based on pixel data, and the input pixel data is corrected using the correction data so as to reduce the influence of the voltage drop on the pixel current.

Abstract: In order to maintain a high visual image quality and save power, a display device includes: R sub-pixels, G sub-pixels, B sub-pixels, and W sub-pixels; and a human detection sensor (12) for detecting whether or not a person is present within a predetermined range. A use rate of the W sub-pixels is changed depending on whether or not a person is present within the predetermined range.

Abstract: Nonuniformity in an organic EL display device is effectively detected. All display pixels of an organic EL panel are turned on and the display is photographed with a digital camera. A computer performs image processing of the photographed image to detect an area in which unevenness exists. Then, a V-I curve of each pixel in the area is measured to calculate necessary correction values. The calculated correction values are stored in a memory for use in correcting a signal input to the organic EL panel.

Abstract: To alleviate an afterimage phenomenon caused by a hysteresis characteristic of a drive transistor. Current driven type light emitting elements 3 are provided for each of pixels 6 that are arranged in a matrix shape, and current of the light emitting elements 3 is controlled using drive TFTs 2 that operate by receiving data voltage on a gate. At least two power supply voltages (PVDDa, PVDDb) for supply to each pixel are provided, one being set to a voltage such that current corresponding to a data voltage flows in the drive TFT 2, the other being set to a voltage beyond a variation range of data voltage and that reverse biases the drive TFT 2, and the two power supply voltages are switched and supplied to each pixel 6.

Abstract: An object of the invention is to convert input RGB data to R?G?B?W data without suffering loss of gradations of the input RGB data. A display panel 12 is configured having unit pixels made up of subpixels of RGBW (red, green, blue, white). In an RGB?R?G?B?W conversion section 10, conversion is carried out under conditions that usage rate of W is less than 100%, and a bit width of input RGB data us larger than a bit width of R?G?B?W data after conversion. In the RGB?R?G?B?W conversion section 10, R1G1B1 values and W values are determined so that an absolute value of a sum of values obtained by multiplying differences between respective RGB data input and respective RGB components in R?G?B?W data after conversion by a weight, becomes minimum.

Abstract: There is provided a display device in which disadvantageous effects due to unnecessary operations of an image lag alleviating function are minimized. In a display device of active matrix type, for each of the pixels arranged in a matrix, a current-driven emissive element is provided, and the current of the emissive element is controlled using a drive TFT so as to perform display. While a black display period during which an opposite bias voltage is applied between the gate electrode and the source electrode of the drive TFT is inserted in order to alleviate image lag, this insertion is performed only when a predetermined condition is satisfied, and is performed for a certain duration according to a command by a microcomputer (10).

Abstract: Embodiments relate to an organic EL panel comprising a panel driving circuit for converting R?G?B?W data into driving signals which is supplied to a pixel circuit. At a RGB?R?G?B?W converting section, the bit width of input RGB data is greater than the bit width of converted R?G?B?W, and the characteristic curve of the amount of luminescent of W sub pixel for the input data of W in the said panel driving circuit is different from the R?G?B? curve normalized at a luminance ratio necessary for a reproduction of white color with sub pixels of RGB. An appropriate process is carried out by the RGB?R?G?B?W converting section in accordance with the curve of input data from the panel driving circuit verses amount of luminescent to minimize an error which may be generated when a conversion is made.

Abstract: Noise on a current to be measured is removed. Horizontal power supply lines (PVDD) are arranged in a horizontal direction and supply a current to pixels in respective corresponding horizontal lines. A switch (8) connects a group of the horizontal power supply lines (PVDD) to a first power supply line (PVDDa) or a second power supply line (PVDDb) disposed outside a pixel region in a switchable manner. Only the horizontal power supply lines (PVDD) in a group to which a pixel to be measured belongs are supplied with power from the second power supply line (PVDDb) so as to measure a current of each pixel in the group, and a current flowing into a power source (PVDDa) connected to a group to which other pixels than the pixel to be measured belong is measured, to thereby calculate a pixel current based on a difference between the two measured currents.

Abstract: A driving method of a display device in which an image is displayed on a display panel having a display element arranged in a pixel matrix, includes comparing, among pixel data corresponding to a display content in each pixel, pixel data corresponding to an nth horizontal scan line of an Nth frame and pixel data corresponding to an nth horizontal scan line of an (N?1)th frame; and setting a brightness reduction ratio with respect to pixel data corresponding to the nth horizontal scan line of the Nth frame or a later horizontal scan line of the Nth frame based as a function of the comparison and all pixel data corresponding to the (N?1)th frame or all pixel data from the nth horizontal scan line of the (N?1)th frame to an (n?1)th horizontal scan line of the Nth frame and controlling power supplied.

Abstract: The rate of reading from a memory for storing display irregularity correction data is lowered. At the time of display, calculation is carried out in a correction calculation section 12 using an input signal and correction data in RAM 22, and brightness inconsistency correction is carried out. The way in which correction calculation is carried out in the correction calculation section 12 is changed for every frame.

Abstract: A method of measuring a panel current in an active matrix organic electroluminescence display panel, wherein when a current flowing through a display panel when one or a plurality of pixels are caused to emit light is measured, a flow-in current flowing into the display panel from a side of a high voltage and a flow-out current flowing out from the display panel toward a side of a low voltage are simultaneously measured, and a value of a panel current is determined using both obtained measurement results.

Abstract: An electroluminescent display device having a first and a second power supply; a respective power supply line for each row, wherein each power supply line is placed along a horizontal direction and is connected to the respective first electrodes of the driving TFTs of the pixels in the corresponding row; a plurality of switches, each connected to one or more power supply lines, for selectively connecting the corresponding one or more power supply lines to either the first or the second power supply; a gate driver for selecting a gate line; and a selecting circuit for controlling the plurality of switches, wherein the selecting circuit causes the power supply line corresponding to the selected gate line to be connected to the first power supply, and the one or more power supply lines not corresponding to the selected gate line to be connected to the second power supply.