33results about How to "Difference in luminance" patented technology

A liquid crystal device having a display section provided with a plurality of X electrodes and a plurality of Y electrodes, a master X driver IC and a slave X driver IC for driving the X electrodes, and a Y driver for driving the Y electrodes. The master IC has a display control signal generation section which generates a display control signal based on a signal from an external MPU and an output terminal (or input / output terminal) which outputs the display control signal. Each of the master IC and slave IC has an input terminal for receiving the display control signal from the master IC through an external wiring. This liquid crystal device can eliminate a luminance difference within the display screen driven by the master IC and the slave IC.

Each pixel includes first and second subpixels and two switching elements provided for those subpixels. Each subpixel includes a liquid crystal capacitor and a storage capacitor. The storage capacitor counter electrodes of the first and second subpixels are electrically independent. A storage capacitor counter voltage applied to each storage capacitor counter electrode by way of its associated storage capacitor line has a first period (A) with a first waveform during one vertical scanning period. The first waveform oscillates between multiple voltage levels in a first cycle time (PA) that is an integral number of times (and at least four times) as long as one horizontal scanning period (H). Each of the voltage levels has a flat portion with a duration TP. While the two switching elements are ON, a display signal voltage is applied to the respective subpixel electrodes and respective storage capacitor electrodes of the first and second subpixels. After the two switching elements have been turned OFF, voltages at the storage capacitor counter electrodes of the first and second subpixels change. And if an interval between a point in time when the two switching elements in ON state have just been turned OFF and a point in time when the storage capacitor counter voltage changes for the first time is βH, TP / 4≦β<3·TP / 4 is satisfied. Consequently, even if a still picture is presented, the difference in luminance between the subpixels is hardly sensible as unevenness, thus achieving good display quality.

This invention presents a YUV to RGB conversion method which preserves high precision of luminance information in an original YUV image signal when converting it to RGB signal. The method can be used to convert the original YUV signal to arbitrary quantization levels in RGB space. In addition, this invention presents methods of pre-quantization and re-quantization as to compensate conventional YUV to RGB color conversion.

To provide a video signal processing apparatus capable of generating video signals that enable displaying and recording of a high-quality picture. A video signal processing apparatus according to an embodiment of the present invention includes a decoder decoding an input TS to generate a video signal having a field frequency fv of 60 Hz or a video signal having a field frequency fv of 59.94 Hz, and a converter converting the respective video signals into NTSC video signals having a color subcarrier the phase of which is inverted for each 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.

In a video display apparatus, a backlight for illuminating a liquid crystal panel is segmented into a plurality of areas. A frequency distribution processing unit calculates a dark pixel amount from the frequency distribution of the gradation values of pixels in a video image. A backlight control unit calculates a lower limit of luminance in each area included in the backlight so that the lower limit increases as the dark pixel amount becomes smaller. The backlight control unit adjusts the luminance in each area individually according to the gradation values in each portion of the video image, and adjusts the luminance in an area where the luminance is less than the lower limit to the lower limit. The difference in luminance between the areas illuminating dark portions of the video image is decreased, and the occurrence of luminance blur resulting from the difference in luminance between the areas is reduced.

Provided is a display device for carrying out seamless display so that a sense of strangeness is not given to a viewer or the sense of strangeness is reduced. In at least one example embodiment, a display device that displays an image based on image signals DAT, includes: a display panel having (i) a display area in which a plurality of display elements for displaying the image are disposed in a matrix and (ii) a frame area which is located at an end of the display panel and in which no display element is provided; a backlight device which emits light, in a form of plane emission, towards a surface opposite to a display surface of the display area; and a light guide element which is provided on the display panel and which changes a light path of part of light emitted from the plurality of display elements so that the part of light is guided to the frame area, and luminance per unit area in a light-emitting surface of the backlight device is larger in a display area end portion where the light guide element is provided than in a normal display area where the light guide element is not provided out of the display area.

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.

An electronic device includes a display module, a base and a keyboard module. The display module is pivoted on the base. The keyboard module is disposed on the base. The keyboard module has a plurality of keys. Each of the keys includes a main body and an imprinted structure. The main body has a top surface. The imprinted structure is disposed on the top surface of the main body and includes a light guiding portion and a light scattering portion. A light emitted by the display module illuminates the keyboard module. The light is guided towards a specific direction when the light passes through the light guiding portion, and the light is scattered in other directions when the light passes through the light scattering portion.

In the present invention, there is provided a display panel driving method of the type wherein the total light emitting period length within a one-field period is controlled to variably control the peak luminance level of a display panel, the driving method including a step of variably controlling, where the one-field period has N light emitting periods disposed therein, N being equal to or greater than 2, the light emitting period length of a particular one of the light emitting periods and the other light emitting period or periods to provide a difference in luminance between the particular light emitting period and the other light emitting period or periods so that the particular light emitting period is visually observed as the center of light emission.

A display device includes: a pixel unit including first pixels disposed in a first pixel area and second pixels disposed in a second pixel area; an image data corrector adjusting a limit grayscale of first image data corresponding to the first pixel area based on a dimming level defining a maximum luminance at which the pixel unit is able to emit light, and correcting the first image data based on the limit grayscale; a data driver supplying data signals to the pixel unit based on the corrected first image data and second image data corresponding to the second pixel area; and a scan driver supplying scan signals to the pixel unit.

A liquid crystal display includes: a first substrate and an opposing second substrate; an alignment layer formed on the first substrate and the second substrate; and a liquid crystal layer interposed between the first substrate and the second substrate. The alignment layer includes a copolymer including a dianhydride monomer and a diamine monomer.

A plasma display panel has an improved display electrode, thereby enhancing emission luminance. The plasma display panel includes a front substrate and a rear substrate that face each other and between which a space is formed, barrier ribs that define a plurality of discharge cells in the space between the front substrate and the rear substrate, address electrodes that extend in a first direction to intersect the discharge cells, phosphor layers that are respectively formed within the discharge cells, and first electrodes and second electrodes having linear portions that are formed in a second direction to intersect the first direction and protruded portions that extend in the first direction from the linear portions and face each other in the second direction within the discharge cells so as to form discharge gaps, respectively.

Disclosed herein is an active-matrix display apparatus, wherein if any particular one of N light emitting sub-devices pertaining to any specific one of pixel circuits is defective, the particular light emitting sub-device is electrically disconnected from the specific pixel circuit and the magnitude of a driving current supplied to the (N−1) remaining light emitting sub-devices pertaining to the specific pixel circuit is adjusted so that the (N−1) remaining light emitting sub-devices receive a driving current from a device driving transistor with a magnitude suppressed to a value equal to ((N−1) / N) times the magnitude of a driving current which is supplied to a normal pixel circuit not including a defective light emitting sub-device.

A plasma display panel driving method in which a reset step and an address step are sequentially executed in the first subfield and second subfield of each field. A microemission step is executed in the first subfield for generating a microemission discharge between ones of the row electrodes and the column electrodes in display cells in the ON mode by applying a voltage for using the ones of the row electrodes as the anode and the column electrodes as the cathode, between the electrodes immediately after the address step. Moreover, in the microemission step, a potential lower than the voltage generated when applying a sustain pulse is respectively applied to the ones and the others of the row electrodes while applying a voltage as described above between the ones of the row electrodes and the column electrodes.