46results about How to "Suppress brightness changes" patented technology

Disclosed herein is a display device including: a pixel array unit having pixel circuits arranged in a form of a matrix; and a control unit having a writing scanning unit for outputting, to the sampling transistor, a writing scanning pulse. The control unit effects control to supply a control input terminal of the drive transistor with a fixed potential for a threshold value correcting operation for retaining a voltage corresponding to a threshold voltage of the drive transistor in the storage capacitor. When setting a voltage across the storage capacitor to the threshold voltage of the drive transistor by repeating the threshold value correcting operation a plurality of times on a time division basis, the control unit effects control to perform each the threshold value correcting operation and the sampling transistor to a conducting state.

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input image signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A current supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive current and hence, the individual gradation levels of the pixels are lowered by correcting the image signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the image signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

In an imaging apparatus capable of selectively performing an imaging operation in normal imaging mode and that in composite imaging mode, auto exposure control is stopped after the auto exposure control for long-time exposure image signals and short-time exposure image signals is temporarily completed in composite imaging mode and if, after the auto exposure control is stopped, a predetermined brightness change in images is detected continuously for a predetermined time or longer based on brightness values detected from the images obtained from a composite image signal, the imaging mode of the imaging apparatus is switched from the composite imaging mode to the normal imaging mode.

This invention is a defect inspection apparatus having a reflecting objective lens free from chromatic aberration, or an achromatic catadioptric lens, and a dioptric objective lens, and thus constructed to suppress changes in brightness due to multi-wavelength illumination (i.e., illumination with the irradiation light having a plurality of wavelength bands), to provide a clearer view of defects present on a sample, by means of selective wavelength detection in order to improve sensitivity, and to allow one spatial image on the sample to be acquired as different kinds of optical images.

A plasma display panel includes a first substrate, and a second substrate facing the first substrate. The first substrate includes a transparent substrate, a scanning electrode and a common electrode both formed on the transparent substrate, and a dielectric layer covering the transparent substrate, the scanning electrode and the common electrode therewith. The second substrate includes an electrically insulating substrate, data electrodes formed on the electrically insulating substrate, partition walls formed on the electrically insulating substrate, and a phosphor layer covering the electrically insulating substrate and the data electrodes therewith between adjacent partition walls. The phosphor layer includes a blue-phosphor layer composed of phosphor which emits a blue light. The blue-phosphor layer is composed of a mixture of two or more phosphors each of which emits a blue light and has an initial brightness and variation of brightness with the lapse of time both different from one another.

A liquid crystal display device having includes a light guide plate having a surface thereof serving as an illuminating surface region opposite to a liquid crystal display panel, light sources mounted on a flexible printed-circuit board and provided on a side face of the light guide plate, an optical sheet member interposed between the liquid crystal display panel and the light guide plate. The side surfaces of the light guide plate with the light sources provided thereon have a ridge-like inclined surface formed thereon, when viewed from the illuminating surface, and the ridge-like inclined surfaces serve as a light-receiving surface with the light source arranged thereon.

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input video signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A voltage supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive voltage and hence, the individual gradation levels of the pixels are lowered by correcting the video signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the video signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input image signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A current supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive current and hence, the individual gradation levels of the pixels are lowered by correcting the image signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the image signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

There is provided a display including: a pixel array part configured to include pixel circuits arranged in a matrix, each of the pixel circuits having a drive transistor, a holding capacitor, an electro-optical element, a sampling transistor, and an initialization transistor, a drive current based on information held in the holding capacitor being produced by the drive transistor and being applied to the electro-optical element for light emission of the electro-optical element; and a controller configured to include a write scanner, a horizontal driver, and an initialization scanner.

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input video signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A voltage supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive voltage and hence, the individual gradation levels of the pixels are lowered by correcting the video signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the video signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

A smoothing calculator determines a smoothed mean luminance value C1×μ(t)+(1−C1)μ′(t−1) based on a mean luminance value μ(t) input at time t and a smoothed mean luminance value μ′(t−1) read at time (t−1) from a buffer, and outputs the smoothed mean luminance value C1×μ(t)+(1−C1)μ′(t−1) as the smoothed mean luminance value μ(t) of the mean luminance value μ(t). Coefficient C1 is greater than 0 but smaller than 1. Gradation conversion responsive to luminance variation from frame to frame in a moving image is thus achieved.

An organic light emitting display device can include a display panel that expresses brightness based on a driving current corresponding to a data voltage, a power source unit that supplies power to the display panel, and a controller configured that outputs a mode control signal for determining a normal mode and a standby mode, drives the display panel to display a first frame for a first time period in the normal mode based on the mode control signal, and drives the display panel to display a second frame for a second time period that is longer than the first time period in the standby mode based on the mode control signal, in which the power source unit supplies a compensation voltage to at least one pixel during the standby mode for compensating a change in the data voltage in the pixel.

A microcomputer calculates a target brightness per brightness mode. Each projection video image display device specifies a target control current value corresponding to a calculated target brightness corresponding to a brightness mode set to the projection video image display device. Each projection video image display device supplies a current indicating the specified control current value to a light source of the projection video image display device.

Grayscale values for previous and current frames are different, and therefore, an overshoot voltage, which has a higher absolute value than a signal voltage, are applied to a data signal line. Next, in a second drive frame, normal drive is performed, so that a signal voltage of the same polarity as the overshoot voltage is written to the data signal line. Moreover, in a first drive frame of a third pause drive period, the grayscale values for the previous and current frames are equal, and also greater than or equal to a boundary value, and therefore, undershoot drive is performed. An undershoot voltage, which has a lower absolute value than a signal voltage, is applied to the data signal line. Next, in a second drive frame, normal drive is performed, so that a signal voltage of the same polarity as the undershoot voltage is written to the data signal line.

Disclosed herein is a display device including: a pixel array unit having pixel circuits arranged in a form of a matrix; and a control unit having a writing scanning unit for outputting, to the sampling transistor, a writing scanning pulse. The control unit effects control to supply a control input terminal of the drive transistor with a fixed potential for a threshold value correcting operation for retaining a voltage corresponding to a threshold voltage of the drive transistor in the storage capacitor. When setting a voltage across the storage capacitor to the threshold voltage of the drive transistor by repeating the threshold value correcting operation a plurality of times on a time division basis, the control unit effects control to perform each the threshold value correcting operation and the sampling transistor to a conducting state.

A display device includes: a display unit having a plurality of pixels each including a light emitting element, a drive transistor and a correction transistor, a scan line, a signal line, a power supply line and a gate line connected to the pixels; a scan line drive circuit applying a selection pulse to the scan line; and a signal line drive circuit writing a video signal to a pixel selected by the scan line drive circuit by applying a video signal voltage to the signal line. The drive transistor and the correction transistor are connected to each other in series on a path between the power supply line and the light emitting element in each of the pixels. Gate voltage for correction to be applied to the gate of the correction transistor via the gate line is set individually in each of unit regions in the display unit.

A light-emitting device includes a plurality of pixels including an organic electroluminescent element, a drive transistor driving the organic electroluminescent element, and a hold capacitor holding a control signal for controlling the drive transistor, the organic electroluminescent element being electrically connected to one of a source electrode and a drain electrode of the drive transistor. The hold capacitor includes a metal layer, an insulating layer, and a semiconductor layer in this order. The semiconductor layer receives light emitted from the organic electroluminescent element. One of the metal layer and the semiconductor layer of the hold capacitor is electrically connected to a gate electrode of the drive transistor, and the other of the metal layer and the semiconductor layer of the hold capacitor is specified at a fixed potential.

A light-emitting device includes: a plurality of light-emitting elements whose luminous energy is controlled according to a current value and a pulse width of a driving signal; a storage unit that stores first and second coefficients for every light-emitting element; a pulse width determining unit that determines the pulse width of the driving signal supplied to each light-emitting element on the basis of the first coefficient for the corresponding light-emitting element stored in the storage unit and a grayscale value designated for the corresponding light-emitting element by grayscale data; a current value determining unit that determines a current value of the driving signal supplied to each light-emitting element on the basis of the second coefficient for the corresponding light-emitting element stored in the storage unit; and a driving unit that supplies the driving signal having the current value determined by the current value determining unit within the pulse width determined by the pulse width determining unit to the corresponding light-emitting element. In the light-emitting device, a variation in the light emission characteristic of each light-emitting element when the pulse width is changed and the current value of the driving signal is fixed is different from a variation in the light emission characteristic thereof when the current value is changed and the pulse width of the driving signal is fixed, and the first and second coefficients stored in the storage unit are selected so that the peak light amount of the individual light-emitting elements when the same grayscale value is designated by the grayscale data are almost equal to one another and variations in the light emission characteristics of the plurality of light-emitting elements driven by the driving signals from the driving unit are substantially equal to one another.

Disclosed herein is a display device that allows a vertical scanning line to be shared between a plurality of rows without increasing the number of control lines or control signals, the display device including pixel circuits; vertical scanning lines; and horizontal scanning lines.

The cathode of an optical element, which is formed by a substrate, an anode formed on the substrate, a luminous element layer and a cathode, is made of aluminum whose surface orientation is substantially uniform. Oxygen content of the aluminum is substantially less or equal to 1×1020 atoms / cm3.

The challenge of the present invention is to suppress a variation in brightness of an image and make a reference value of a black level converge at an appropriate value in a short time. A condition judgment circuit judges whether or not a frame of an amount of change in gains of a variable gain amplifier being equal to or greater than a threshold continues for a predefined frames or more. If a frame of an amount of change in the gains being equal to or greater than the threshold continues for the predefined frames, a black level value of the current frame is set for new black level reference. If not continues for the predetermined number, the previous black level reference value is retained in lieu of correcting the black level.

In a display apparatus having a liquid crystal panel, a change in luminance of the entire display frame when overshoot driving is performed is suppressed, while improving a viewing angle of the liquid crystal panel. A processing unit performs a high gradation display displaying a gradation higher than a gradation of an input image at one of two adjacent pixels, performs a low gradation display displaying a gradation lower than a gradation of an input image at the other of the two adjacent pixels, and switches between the high gradation display and the low gradation display for each pixel every display frame. A correction unit corrects a gradation of a pixel located adjacent to a pixel displayed with a gradation for which predetermined overshoot driving is difficult in the next display frame to a gradation for which overshoot driving stronger than the predetermined overshoot driving is possible.

An organic light emitting display device can include a display panel that expresses brightness based on a driving current corresponding to a data voltage, a power source unit that supplies power to the display panel, and a controller configured that outputs a mode control signal for determining a normal mode and a standby mode, drives the display panel to display a first frame for a first time period in the normal mode based on the mode control signal, and drives the display panel to display a second frame for a second time period that is longer than the first time period in the standby mode based on the mode control signal, in which the power source unit supplies a compensation voltage to at least one pixel during the standby mode for compensating a change in the data voltage in the pixel.

The image capturing apparatus includes an image capturing unit for capturing a subject image, a calculating unit for calculating an exposure amount at a time of capturing by the image capturing unit, a range correction unit for performing range correction for compressing a range of luminance in an image signal captured by the image capturing unit, an identification unit for identifying a luminance change amount of an image signal caused by range correction, and a changing unit for, based on the luminance change amount identified by the identification unit, changing at least one of the exposure amount and a reference luminance value in an input / output characteristic in a case of performing the range correction.