Abstract: A display device includes a display panel including a plurality of pixels and that displays an image in a display area, and a driving controller which receives an image signal, drives the plurality of pixels, where the driving controller includes a compensation unit, and the plurality of pixels include a first pixel disposed in a central area of the display area and a second pixel spaced apart from the central area by a preset distance, the compensation unit outputs compensation data for controlling luminance of the image, and the display panel displays the image, in which a first luminance of the first pixel is less than a second luminance of the second pixel with respect to a same luminance value, based on the compensation data.

Abstract: A head mount display device includes a display panel including pixels, a shifter that divides the display panel into a reference area including a reference point and a peripheral area surrounding the reference area, and determines each of the reference area and the peripheral area as one of an upscaling area and a downscaling area, and a scaler that scales input image data based on the upscaling area and the downscaling area.

Abstract: A method of generating information to control display of images providing a display device with align pattern data to which box data having a maximum reference gray level is added, obtaining a first capture image generated based on the align pattern data to which the box data is added, providing the display device with one or more full pattern data respectively having one or more reference gray levels lower than the maximum reference gray level, and obtaining one or more second capture images generated based on the one or more full pattern data. The method also includes generating compensation data including compensation values at the one or more reference gray levels and the maximum reference gray level. The compensation data may be generated based on the one or more second capture images and a portion of the first capture image corresponding to the box data.

Abstract: A tiled display device includes a plurality of display panels coupled to each other, where each of the plurality of display panels includes an edge region adjacent to a boundary line between the plurality of display panels, and a panel driver which multiplies input gray levels of input image data for the plurality of display panels by an adaptive gain, generates boundary compensated image data by adding boundary compensation gray levels to the input gray levels multiplied by the adaptive gain for the edge region, and drives the plurality of display panels based on the boundary compensated image data. The adaptive gain is gradually decreased over a plurality of frame periods in a case where a sum of each of the input gray levels for the edge region and a corresponding one of the boundary compensation gray levels exceeds a maximum gray level.

Abstract: A tiled display device includes a plurality of display panels coupled to each other, where each of the plurality of display panels includes an edge region adjacent to a boundary line between the plurality of display panels, and a panel driver which multiplies input gray levels of input image data for the plurality of display panels by an adaptive gain, generates boundary compensated image data by adding boundary compensation gray levels to the input gray levels multiplied by the adaptive gain for the edge region, and drives the plurality of display panels based on the boundary compensated image data. The adaptive gain is gradually decreased over a plurality of frame periods in a case where a sum of each of the input gray levels for the edge region and a corresponding one of the boundary compensation gray levels exceeds a maximum gray level.

Abstract: A method of displaying an image on a display panel includes displaying an image of a grayscale value A, imaging the image of the grayscale value A with a camera, displaying an image of a grayscale value B, imaging the image of the grayscale value B with the camera, determining a compensation parameter P of the grayscale value A for each pixel in the display panel using the imaged data of the grayscale value A, determining a representative value Q of probability distribution of the compensation parameters of the grayscale value A from the image of the grayscale value A, determining a representative value R of probability distribution of compensation parameters of the grayscale value B from the image of the grayscale value B and compensating an input image data for each pixel using the value P, the value Q and the value R.

Abstract: A method of generating information to control display of images providing a display device with align pattern data to which box data having a maximum reference gray level is added, obtaining a first capture image generated based on the align pattern data to which the box data is added, providing the display device with one or more full pattern data respectively having one or more reference gray levels lower than the maximum reference gray level, and obtaining one or more second capture images generated based on the one or more full pattern data. The method also includes generating compensation data including compensation values at the one or more reference gray levels and the maximum reference gray level. The compensation data may be generated based on the one or more second capture images and a portion of the first capture image corresponding to the box data.

Abstract: A test apparatus includes: a compensation coefficient calculator configured to calculate a main compensation coefficient for a main gradation and a sub compensation coefficient for a sub gradation based on a detected image signal; a primary predictor configured to determine a representative value of each of a plurality of blocks of a display panel based on the detected image signal, and output a prediction compensation coefficient for the sub gradation based on the main compensation coefficient and the representative value corresponding to each of the plurality of blocks; a secondary predictor configured to determine a flag based on the sub compensation coefficient and the prediction compensation coefficient; and a controller configured to output the main compensation coefficient, the representative value, and the flag stored in a memory as compensation data.

Abstract: A test apparatus includes: a compensation coefficient calculator configured to calculate a main compensation coefficient for a main gradation and a sub compensation coefficient for a sub gradation based on a detected image signal; a primary predictor configured to determine a representative value of each of a plurality of blocks of a display panel based on the detected image signal, and output a prediction compensation coefficient for the sub gradation based on the main compensation coefficient and the representative value corresponding to each of the plurality of blocks; a secondary predictor configured to determine a flag based on the sub compensation coefficient and the prediction compensation coefficient; and a controller configured to output the main compensation coefficient, the representative value, and the flag stored in a memory as compensation data.

Abstract: A method of displaying an image on a display panel includes displaying an image of a grayscale value A, imaging the image of the grayscale value A with a camera, displaying an image of a grayscale value B, imaging the image of the grayscale value B with the camera, determining a compensation parameter P of the grayscale value A for each pixel in the display panel using the imaged data of the grayscale value A, determining a representative value Q of probability distribution of the compensation parameters of the grayscale value A from the image of the grayscale value A, determining a representative value R of probability distribution of compensation parameters of the grayscale value B from the image of the grayscale value B and compensating an input image data for each pixel using the value P, the value Q and the value R.

Abstract: A method of compensating for non-uniform luminance of a display panel including first pixels in a center region and second pixels in a non-center region, the method including displaying a for-compensation image, generating a luminance image by capturing an image of an entire region of the display panel, extracting luminance values of the first pixels from the luminance image by analyzing the luminance image, calculating and storing compensation factors for the first pixels based on the luminance values thereof, calculating compensation factors for the second pixels by performing an interpolation between a reference compensation factor determined for an edge of the non-center region and compensation factors for edge pixels on an edge of the center region when a displaying operation is performed, and compensating image data using the compensation factors for the first pixels and the second pixels when the displaying operation is performed on the display panel.

Abstract: A display device and a method of compensating a luminance of the display device enhance display quality and reducing storage capacity of a memory, the display device including: a display panel including a plurality of pixels arranged in a matrix form; a storage unit storing a gray level compensation value of a reference pixel defined by at least one pixel; a compensation circuit receiving a gray level datum and generating a compensated gray level datum by applying the gray level compensation value; and a data driving circuit receiving the compensated gray level datum to generate a data voltage and outputting the data voltage to the display panel. The display panel includes a first compensation area and a second compensation area. The reference pixel in the first compensation area is defined by one pixel and the reference pixel in the second compensation area is defined by m×n pixels, m and n being natural numbers greater than 1.

Abstract: A method of compensating for non-uniform luminance of a display panel including first pixels in a center region and second pixels in a non-center region, the method including displaying a for-compensation image, generating a luminance image by capturing an image of an entire region of the display panel, extracting luminance values of the first pixels from the luminance image by analyzing the luminance image, calculating and storing compensation factors for the first pixels based on the luminance values thereof, calculating compensation factors for the second pixels by performing an interpolation between a reference compensation factor determined for an edge of the non-center region and compensation factors for edge pixels on an edge of the center region when a displaying operation is performed, and compensating image data using the compensation factors for the first pixels and the second pixels when the displaying operation is performed on the display panel.

Abstract: Degradation compensator includes a compressor which generates a block-level compression stress matrix (“BCSM”) representing a degradation level of a block included in a frame by R, G, and B input signals of the block, an updater update a frame-level accumulated compression stress matrix (“FACSM”) by adding the BCSM, an error corrector which executes error-correction encoding to elements of a block-level accumulated compression stress matrix (“BACSM”) included in the FACSM, writes encoded elements as a storage data of a non-volatile memory device when a power supply is stopped, executes error-correction decoding to the storage data and writes the decoded storage data as the FACSM of the volatile memory when the power supply is started, a restorer which generates a block-level accumulated stress matrix (“BASM”), and an internal compensator which generates compensated R, G, and B output signals.

Abstract: Degradation compensator includes a compressor which generates a block-level compression stress matrix (“BCSM”) representing a degradation level of a block included in a frame by R, G, and B input signals of the block, an updater update a frame-level accumulated compression stress matrix (“FACSM”) by adding the BCSM, an error corrector which executes error-correction encoding to elements of a block-level accumulated compression stress matrix (“BACSM”) included in the FACSM, writes encoded elements as a storage data of a non-volatile memory device when a power supply is stopped, executes error-correction decoding to the storage data and writes the decoded storage data as the FACSM of the volatile memory when the power supply is started, a restorer which generates a block-level accumulated stress matrix (“BASM”), and an internal compensator which generates compensated R, G, and B output signals

Abstract: A method of programming data in a nonvolatile memory device comprises receiving program data to be programmed in selected memory cells of the nonvolatile memory device, reading data from the selected memory cells, encoding the program data using at least one encoding scheme selected from among multiple encoding schemes according to a comparison of the program data and the read data, generating flag data including encoding information, and programming the encoded program data and the flag data in the selected memory cells.

Abstract: A method of programming data in a nonvolatile memory device comprises receiving program data to be programmed in selected memory cells of the nonvolatile memory device, reading data from the selected memory cells, encoding the program data using at least one encoding scheme selected from among multiple encoding schemes according to a comparison of the program data and the read data, generating flag data including encoding information, and programming the encoded program data and the flag data in the selected memory cells.