32results about How to "Difference in luminance" patented technology

A method for driving a display device includes: dividing an entire gray-scale region corresponding to a data gray scale into a first gray-scale region and a second gray-scale region and setting a first gamma value of the first gray-scale region and a second gamma value of the second gray-scale region, the first gamma value being smaller than the second gamma value; providing a first gray-scale display voltage corresponding to the data gray scale to a display panel during a first section of one horizontal period by using the first gamma value or the second gamma value selected by an inputted data gray scale; and providing a second gray-scale display voltage corresponding to a black gray scale to the display panel during a second section of the one horizontal period.

A liquid crystal display device includes a liquid crystal display panel, a light source configured to provide the liquid crystal display panel with a light, a vertical blank detector circuit configured to calculate a counting value of a vertical blank period of a frame by counting a synchronization signal, a luminance correction value calculator circuit configured to calculate a luminance correction value by comparing the counting value of the vertical blank period with a plurality of reference counting values, and a light source driver configured to generate a light source driving signal and provide the light source driving signal to the light source. The light source driving signal has a normal level corresponding to a normal luminance value in an active period of the frame and has a correction level corresponding to the luminance correction value in the vertical blank period of the frame.

A display apparatus includes a display panel comprising a plurality of gate lines connected to a plurality of pixel rows, a plurality of data lines connected to a plurality of a pixel columns, at least one dummy pixel row disposed in a peripheral area surrounding a display area in which the plurality of pixel rows and the plurality of a pixel columns are disposed, and at least one dummy gate line connected to the dummy pixel row and a data driver circuit configured to provide the dummy pixel row with a dummy data signal, the dummy data signal having a level that differs from a data signal of a pixel column adjacent to the dummy pixel row.

The image display quality is improved by reducing the afterimage phenomenon of a display image on a plasma display panel. For this purpose, the image display region of the panel is divided into a plurality of regions, the difference between the luminance gradation value in the present field and that in the field immediately before the present field is calculated as the inter-field luminance difference. Then, the number of pixels where the inter-field luminance difference is lower than a predetermined luminance comparison value is counted, and the counting result is set as a first count value. The number of edges where the difference between the luminance gradation values of adjacent pixels is equal to a predetermined edge comparison value or larger is counted, and the counting result is set as a second count value. The afterimage strength level region is calculated based on the first and second count values.

Provided is a liquid crystal display device with which it is possible to suppress degradation of image quality during video display or three-dimensional display without causing gradational luminance irregularities. Writing of an image to be displayed is sequentially performed from one side of a panel to the other side thereof during each frame period, and writing of a black image is sequentially performed from the one side of the panel to the other side thereof during the vertical blanking period in each frame period. A plurality of LEDs composing a backlight are divided into a plurality of segments so that a group of LEDs arrayed in a line in the direction in which scanning signal lines extend belong to the same segment. A segment lighting control circuit in a backlight control circuit controls emission intensities of the LEDs segment by segment so that the intensity of light irradiating the panel increases gradually from the one side of the panel to the other side thereof.

Disclosed herein is a display device including a pixel array configured to include pixel circuits arranged in a matrix having a light emitting element, driving transistor, sampling transistor, and hold capacitor. The display device further includes a signal selector, driving control scanner, and writing scanner. The signal selector alternately carries out supply of a video signal voltage in order from a beginning line to an end line in a unit and supply of a video signal voltage in order from an end line to a beginning line in a unit. The writing scanner outputs the pulse to the writing control lines in such a way that input of a video signal voltage in order from a beginning line to an end line in a unit and input of a video signal voltage in order from an end line to a beginning line in a unit are alternately carried out.

A display device includes a substrate, a gate line connected to a gate driver, a reference voltage line, a data line crossing the gate line and the reference voltage line, a first thin film transistor including a first drain electrode and connected to the gate line and the data line, a second thin film transistor including a second drain electrode, a third thin film transistor connected to the gate line, the reference voltage line, and the second thin film transistor, and a pixel electrode including a first sub-pixel electrode connected to the first thin film transistor and a second sub-pixel electrode connected to the second thin film transistor. The first drain electrode overlaps the reference voltage line, and an area of a region in which the first drain electrode and the reference voltage line overlap each other increases in a direction toward the gate driver.

An error diffusion method and apparatus using an area ratio of candidate colors in a CMYKRGBW cube, wherein the candidate colors are determined in response to an input value, and the CMYKRGBW cube is converted into a color space consisting of only four colors so that the candidate colors can be evenly distributed. The color space is then expressed using the area ratio of the candidate colors. Accordingly, it is possible to evenly distribute candidate colors in all gray-scale regions, including a highlight region, thereby obtaining a soft image that does not have a pattern that is strenuous on the eye of an observer.

A backlight module that includes a lamp and a single side driving inverter that is coupled to one end of the lamp. The single side driving inverter is configured to control an operating current of the lamp to be within 80% to 100% of a saturation luminance current. The lamp has a characteristic such that when the operating current is lower than the saturation luminance current, the lamp luminance increases as the operating current increases, and when the operating current is substantially equal to or higher than the saturation luminance current, the lamp luminance does not increase as the operating current increases.