PWM-frame rate misalignment is mitigated through implementation of a discrete variable refresh rate (VRR) scheme. A target frame rate is limited to a frame rate selected from only those frame rates that facilitate alignment of each frame period to a specified edge of a PWM cycle of a brightness control signal of a display panel. This alignment results in each frame period at the selected frame rate starting at a same point in a corresponding PWM cycle and ending at a same point in a corresponding PWM cycle to help ensure a constant effective duty cycle across each successive frame period, which in turn mitigates perception of flicker that otherwise would arise. Further, the discrete VRR scheme can employ a compensation mode for compensating for the delay in rendering or otherwise obtaining a frame for display so as to maintain a consistent duty cycle in the brightness control signal.

A display device, a compensation system, and a compensation data compression method. The display device includes a display panel including a plurality of subpixels, a compensation module generating compensation data regarding subpixels disposed in a normal area, a fixed pattern area, and a bad pixel area, and a compression module generating compressed compensation data by compressing the compensation data. The compressed compensation data includes compressed compensation data regarding the normal area, compressed compensation data regarding the fixed pattern area, and compressed compensation data regarding the bad pixel area. The compressed compensation data regarding the normal area includes normal compensation data processed by encoding, the compressed compensation data regarding the fixed pattern area include fixed compensation data processed by the encoding and error information resulting from the encoding, and the compressed compensation data regarding the bad pixel area includes a flag regarding the bad pixel area.

A display device according to embodiments of the present disclosure may include a display panel, a data driver configured to drive by dividing a diving period into an active period and a blank period, and apply a parking voltage during the blank period, and a controller configured to vary a driving frequency in frame units according to an input image, and, according to the driving frequency, to operate a frame as a refresh frame for writing the data voltage, or operate by dividing the frame into the refresh frame and a hold frame, wherein a voltage level of the parking voltage varies according to the driving frequency. Accordingly, it is possible to prevent a stripe defects and improve the uniformity of the display panel by reducing the mura of a parking voltage, thereby improving image quality.

An image display method using an image display device is provided. The method includes performing a first operation to cause light to be emitted from light-emitting regions of a backlight at respective intensity in accordance with frame image data, sequentially with respect to each of first areas of the backlight, and performing a second operation to apply voltages to pixels of a liquid crystal panel at respective levels in accordance with the frame image data, sequentially with respect to each of second areas of the liquid crystal panel. Light-emitting regions in each of the first areas are repeatedly turned on and off a plurality of times during the first operation thereof.

A display device includes a controller and a display panel. The controller receives original image data and output a display image signal. The display panel receives the display image signal and displays a display image corresponding to the display image signal. The controller includes an image shift controller and a memory. The image shift controller generates shifted image data by modulating the original image data to shift the display image sequentially along a preset shift path on the display panel. The memory stores a shift path value indicating a distance by which the display image has been shifted on the preset shift path. The image shift controller generates the display image signal by processing the shifted image data. When the display device is powered on, the image shift controller generates shifted image data corresponding to a shift path value stored in the memory.

A method of driving a display device, which includes a plurality of segments, each including a plurality of pixels, includes comparing grayscales of first image data of a first frame with respect to a segment among the plurality of segments and grayscales of a second image data of a second frame after the first frame with respect to the segment, modulating the second image data to generate first modulated data when the grayscales of the first image data are equal to the grayscales of the second image data, and providing data voltages to the segment based on the first modulated data.

A computer system is provided that generates images based on execution of an application program such as a video game. When required, images are generated by blending the image data of two successively generated images, with one of the images (e.g., the current or previous image) having a blend factor applied thereto. After a threshold number of images has been blended in this manner, the process switches to applying the blend factor to the other one of the images.

The present application discloses a reference voltage generation system and method. The reference voltage generation system includes: a reference voltage generator; and a voltage division circuit coupled to the reference voltage generator. The reference voltage generator is coupled to a reference voltage through the voltage division circuit.

A screen saver controller including a load calculator configured to generate load data of an image represented by input image data, a maximum gray level calculator configured to generate maximum gray level data of the image represented by the input image data, and a screen saver data generator configured to determine a gain of a screen saver mode based on the load data and the maximum gray level data when the screen saver mode is operated and to generate screen saver data based on the input image data and the gain.

A display device includes pixels, and first, second, and third gate lines and data lines connected to the pixels. At least one of the pixels includes a light emitting element, a first transistor connected between a first power source and the light emitting element for driving the light emitting element according to a voltage of a first node, a second transistor connected between the first node and a corresponding data line, and driven according to a voltage of a corresponding first gate line, a capacitor connected between the first node and a second node between the first transistor and the light emitting element, a third transistor between the second node and an initialization power line, and driven according to a voltage of a corresponding second gate line, and a fourth transistor connected between the first and second nodes, and driven according to a voltage of a corresponding third gate line.