Abstract:
A display device includes a display panel that includes a pixel, a current sensor that measures a driving current provided to the display panel, and a timing controller that calculates a reference driving current and a degradation ratio of the pixel based on first image data provided to the display panel and compensates second image data based on the driving current, the reference driving current, and the degradation ratio of the pixel.
Abstract:
An organic light emitting display includes a power supply source and a power voltage compensation unit. The power supply source supplies at least a first power voltage to a first power voltage line of the display. The power voltage compensation unit to generate a first compensation power voltage based on the first power voltage and a feedback power voltage from the first power voltage line. The first power voltage compensation unit outputs the first compensation power voltage to the first power voltage line.
Abstract:
A display device is provided that can provide sufficient time for threshold voltage compensation of a driving transistor of each pixel during high-speed driving of the display device, and a method for driving the same. A data writing and threshold voltage compensation step of pixels at odd and even-numbered lines are concurrently performed during an extended time period so that the time available for threshold voltage compensation of the driving transistors can be increased.
Abstract:
Luminance correction systems and methods capable of reducing or removing luminance mura of display devices are provided. One luminance correction system includes: a display device including a plurality of pixels, the pixels including a plurality of sub-pixels, each of the pixels comprising at least two of the sub-pixels; an image capturing unit including a plurality of charge-coupled device (CCD) image capturing elements, an n×n arrangement of the image capturing elements corresponding torn of the pixels, n and m being natural numbers greater than or equal to 2; and a luminance correction device configured to generate a representative luminance value with respect to the m of the pixels based on luminance values measured by the n×n arrangement of the image capturing elements, and calculate a correction value with respect to the m of the pixels according to a difference between the representative luminance value and a target luminance value.
Abstract:
An organic light emitting display device and a driving method thereof that can stably compensate for a threshold voltage of a driving transistor. The organic light emitting display device includes pixels positioned at intersection portions (crossing regions) of scan lines and data lines, each pixel including the driving transistor having a gate electrode initialized to a voltage of an initialization power source before a data signal is supplied; power source lines coupled to the pixels in a column direction parallel with the data lines; and an initialization power source generator generating the initialization power source to the pixels via the power source lines. In the organic light emitting display device, the initialization power source generator controls the voltage of the initialization power source supplied to each pixel, corresponding to the gray scale of the data signal to be supplied to the pixel.
Abstract:
A display device is disclosed. In one aspect, the device includes a display panel that includes i) a plurality of pixels including first and second light emission control transistors, ii) a first light emission driver configured to generate a first switching control signal, iii) a second light emission driver configured to generate a second switching control signal, iv) a signal controller configured to generate and transfer a first light emission control signal and v) a light emission controller configured to generate and transfer a second light emission control signal. The light emission controller acquires information of a gray depth from a result value obtained by summing gray data, determines a light emission control algorithm according to the gray depth, and generates the second light emission control signal so that the pixels emit light during different light emission periods for a plurality of frames.
Abstract:
An optical compensation method for a display device including a pixel is provided. The method includes: providing test data having a first grayscale value to the display device; measuring a luminance of the pixel which emits light based on the test data; and calculating a compensation grayscale value based on a second target luminance and the measured luminance of the pixel. The second target luminance is lower than a first target luminance which is set based on the first grayscale value.
Abstract:
A stain compensating apparatus includes a camera, an input signal processing part, an edge compensating part and a stain compensating value generating part. The camera captures a display image from the display panel. The input signal processing part generates a luminance profile based on the display image captured by the camera. The edge compensating part compensates the luminance profile of a curved portion of the display panel. The stain compensating value generating part generates a stain compensating value for a pixel of the display panel using the compensated luminance profile.
Abstract:
An apparatus includes a controller to generate at least one pulse width modulated (PWM) signal to control a switch connected to a pixel circuit of a display device. The at least one PWM signal controls coupling of a current source or a current sink through the switch to the pixel circuit. When the PWM signal is applied during a first period, the PWM signal has a width sufficient to discharge a pixel capacitor. When the PWM signal is applied during a second period, the PWM signal has a width which is based on a data signal. The pixel circuit controls emission of light with a certain gray scale value based on the data signal.
Abstract:
A system and a method for luminance correction that can remove luminance spots of a display device. The system includes a display device, an image detection unit, and a luminance correction device. The display device includes a plurality of sub-pixels including first sub-pixels and corresponding second sub-pixels. The image detection unit is configured to measure respective luminance values of the first sub-pixels. The luminance correction device is configured to supply test data so that only the first sub-pixels emit light, and to calculate correction values corresponding to the plurality of sub-pixels based on difference values between the respective luminance values measured by the image detection unit and one or more target luminance values.