Abstract: Disclosed is a method of driving a display panel for displaying a halftone image of each of fields constituting a video signal, each field being composed of a plurality of subfields. This method detects a luminance distribution of the video signal, divides each of the fields into a first subfield group comprised of N subfields and a second subfield group comprised of M subfields (N, M are integers equal to or more than one), and displays the first subfield group with 2N gradation levels and the second subfield group with (M+1) gradation levels. The numbers N, M of subfields respectively allocated to the first and second subfield groups are set in accordance with the luminance distribution.

Abstract: It is an object of the present invention to provide a display panel driver with which power consumption can be reduced. The display panel driver includes a pixel data pulse generation circuit which generates pixel data pulses by connecting the column electrodes and a power source line in accordance with the pixel data to apply the pixel data pulses to the column electrodes, and a resonance pulse power circuit which generates a resonance pulse power source voltage to apply the resonance pulse power source voltage to the power source line, the resonance pulse power circuit changing the resonance amplitude of the resonance pulse power source voltage while keeping a maximum voltage of the resonance pulse power source voltage in accordance with a pattern of a pulse sequence of the pixel data pulses.

Abstract: A method of driving a display panel for displaying a quality image reduced of display noise. A first process is executed for making the sub-field different between display lines adjacent in the number of M, in order for causing the state of the pixel cells to transfer from the one state into the other state of on and off modes, in a particular sub-field group having sub-fields in number of M (M: integer of 2 or greater) arranged successive within the frame display period and in a subsequent sub-field group of among sub-field groups subsequent to the particular sub-field group. Within the particular sub-field group, executed is any one of a second process for causing a state of the pixel cells from the one state into the other state only within a predetermined one of the sub-fields of the particular sub-field group and the first process.

Abstract: Disclosed is an user-friendly display device for operating with a power consumption desired by the user. The display device comprises: a characteristic acquisition unit for obtaining a characteristic indicative of a correspondence relationship between an average peak level and the number of display pulses corresponding to a target power consumption; an average peak level detector for detecting an average peak level of an input image signal; a driving control unit for determining the number of display pulses corresponding to the detected average peak level with reference to the characteristic; a driver for generating a display pulse a number of times equal to the number determined by the driving control unit; and a display panel for receiving the display pulses supplied from the driver to emit light at a luminance depending on the number of display pulses.

Abstract: The object of the invention is to provide a method for driving a plasma display panel that provides an improved expression of levels of halftone as well as an improved display quality. In N sub-fields constituting a display period of one field, when a pixel data writing step for setting discharge cells to either one of non-light-emitting cells or light-emitting cells in response to pixel data and a light-emission sustaining step for allowing only the aforementioned light-emitting cells to emit light only during a light-emission period corresponding to weights assigned to the sub-fields respectively are executed, the light-emission period in the light-emission sustaining step of the respective sub-fields is changed field by field or frame by frame. According to another aspect, the invention allows for carrying out selectively a first drive pattern or a second drive pattern.

Abstract: A luminance level compensating apparatus passes only the luminance signal of a pixel in a first detection range in the vertical direction of an image indicated by an input luminance signal, detects and stores a first frequency for each luminance level of the passed luminance signal for each predetermined period, passes only a luminance signal of a pixel in a second detection range including the first detection range in the vertical direction of the image, detects and stores a second frequency for each luminance level of the passed luminance signal for each predetermined period; generates a mixed frequency data based on the first and second frequencies stored.

Abstract: The object is to provide a display device in which high-quality image display that is free from luminance nonuniformity can be obtained with a simplified structure. A magnitude of load corresponding to the light emission state of each pixel cell on a display line is measured for each display line based on a video signal, and correction of the luminance level according to the magnitude of load corresponding to the display line is conducted for the interval of the video signal corresponding to each display line.

Abstract: A display device with a dithering circuit is provided which can perform dithering on an input video signal without causing flicker and dither noise. A correction value is provided to reduce the difference (average error value) between an average value of brightness levels represented by pixel data corresponding to each of pixels in a pixel group and an average value of brightness levels represented by dither added pixel data corresponding to each of the pixels in the pixel group. This correction value is added to the dither added pixel data for correction. This prevents flicker from being produced even when the assignment of dither coefficients in the pixel group is changed in each field to reduce dither noise. Also provided is a gray scale processing system which can perform gray scale processing on an input video signal without causing problems such as flicker.

Abstract: The object of the invention is to provide a method for driving a plasma display panel that provides an improved expression of levels of halftone as well as an improved display quality. In N sub-fields constituting a display period of one field, when a pixel data writing step for setting discharge cells to either one of non-light-emitting cells or light-emitting cells in response to pixel data and a light-emission sustaining step for allowing only the aforementioned light-emitting cells to emit light only during a light-emission period corresponding to weights assigned to the sub-fields respectively are executed, the light-emission period in the light-emission sustaining step of the respective sub-fields is changed field by field or frame by frame. According to another aspect, the invention allows for carrying out selectively a first drive pattern or a second drive pattern.

Abstract: The object of the invention is to provide a method for driving a plasma display panel that provides an improved expression of levels of halftone as well as an improved display quality. In N sub-fields constituting a display period of one field, when a pixel data writing step for setting discharge cells to either one of non-light-emitting cells or light-emitting cells in response to pixel data and a light-emission sustaining step for allowing only the aforementioned light-emitting cells to emit light only during a light-emission period corresponding to weights assigned to the sub-fields respectively are executed, the light-emission period in the light-emission sustaining step of the respective sub-fields is changed field by field or frame by frame. According to another aspect, the invention allows for carrying out selectively a first drive pattern or a second drive pattern.

Abstract: A method of grayscale-driving a display panel in accordance with pixel data derived from a video signal. The display panel includes a plurality of display lines, with a plurality of pixel cells serving as pixels being arranged on each display line. A display period of a single field of the video signal is divided into a plurality of subfields. The method includes dividing one subfield into M lower subfields. M is an integer greater than one. M groups of display lines are prepared by sequentially taking every M display lines from the display lines. First to Mth address steps are performed in the M lower subfields respectively and sequentially. Each address step sets the pixel cells belonging to the display lines of the display line group concerned, to a drive mode determined by the pixel data. A first light emission step is performed to cause the pixel cells whose drive mode is a lit mode, to emit light directly before or after the address step concerned. Another subfield is divided into N lower subfields.

Abstract: A driver device for a display panel. Pixel cells are arranged on respective display lines of the display panel. Each N adjacent display lines makes one display line group. N is an integer of two or more. The pixels in each display line group are driven to emit light at different luminance levels based on one of M different dither patterns. One of the M dither patterns is selected sequentially and in predetermined periods, and the selected dither pattern is used. M is less than N. In the dither processing, N different weighting values are allocated to the N display lines in the display line group, respectively.

Abstract: A video signal conversion apparatus which can enhance display qualities for video signals of both film source and video source. The conversion apparatus includes an input signal discrimination unit which discriminates the sort and signal supply source of an input video signal, and an operation mode setting unit which sets the operation modes of the individual sorts of video signals for each of a plurality of signal supply sources. The operation mode which corresponds to the sort and signal supply source of the input video signal as discriminated by the input signal discrimination unit is obtained from the operation mode setting unit, and the operation of at least one of a film source discrimination unit, an interlace/progressive conversion unit and a frame rate conversion unit is controlled in accordance with the obtained operation mode.

Abstract: A display device displays an image according to an input image signal on a display panel. The display device includes a plurality of display cells for creating the image from pixel signals with different emission colors according to the signal levels thereof. The display cells are arrayed in a matrix. The display device includes a brightness level calculation circuit for calculating emission brightness of the displayed image, and generating a brightness level signal that indicates the level of the emission brightness. The display device also includes an emission level correction circuit for correcting the signal levels of pixel signals included in the image signal for respective emission colors according to the brightness level signal.

Abstract: An improved driving device for a display panel. In the display panel, pixel cells serving as pixels are positioned in a plurality of display lines. The driving device drives the display panel according to pixel data derived from an input image signal. The display lines are divided into a plurality of display line groups, and each group includes a plurality of neighboring display lines. The driving device has a light emission driving circuit. This circuit causes the pixel cells in each of the neighboring display lines in the respective display line groups to emit light at different brightness levels based on weighting values assigned to the display lines. The weighting values are assigned to the display lines such that bias in brightness differences between the pixel cells positioned in neighboring display lines falls within a prescribed range for all neighboring display lines in the display panel.

Abstract: A video signal converting apparatus and method for improving display quality of video signals from both film source and video source. It is discriminated whether the input video signal is an interlaced video signal or not, and it is discriminated whether the input video signal is a video signal from a film source based on a film. If the input video signal is discriminated as interlaced video signals, the input video signal is converted, for outputting, to the progressive video signals by a converting method in accordance with a discrimination result regarding whether the input video signal is a video signal from the film source or not. The converted progressive video signal is converted, for outputting, to a video signal having a high frame rate in accordance with the discrimination result regarding whether the converted progressive video signal is a video signal from the film source or not.

Abstract: A plasma display device capable of providing high luminance display. In each subfield, a non-selected line on which all the discharge cells are not subjected to selective discharge is detected, and pixel data writing scanning is performed only to display lines excluding such non-selected lines.

Abstract: A display panel drive capable of satisfactory image display with dither patterns suppressed. Display lines of a display panel are each divided into M display line groups including [M·(k−1)+1]th display lines (where M is a natural number, and k is a natural number of n/M or smaller) of the display panel, a display line group including [M·(k−1)+2]th display lines, a display line group including [M·(k−1)+3]th display lines, . . . , a display line group including [M·(k−1)+M]th display lines. Then, to each of the display line groups, each different offset value is assigned for addition to pixel data each corresponding to the display line groups, deriving multi-grayscale pixel data.

Abstract: A video signal processing section selects a display panel driving sequence scheme corresponding to the signal processing scheme to be performed on an input video signal to supply an instruction signal designating the driving sequence scheme to a display panel driving section together with the video signal on which the signal processing is performed. The display panel driving section drives the display panel in accordance with the driving sequence designated by the instruction signal on the basis of the video signal supplied from the video signal processing section.

Abstract: A display panel driving apparatus includes a display control section for controlling display on a plasma display panel, a drive section for driving the plasma display panel on the basis of a signal supplied from the display control section, and a transmission line for transferring data between the display control section and the drive section. The drive section includes a decoder section for decoding the signal supplied from the display control section and generating a control signal to generate drive pulses.