Pioneer Corporation

Pioneer Electronic Corporation

Panasonic Corporation

Pioneer Electric Corporation

Pioneer Electronics Corporation

Pioneer Display Products Corporation

Tetsuya Shigeta

Tetsuro Nagakubo

Hirofumi Honda

Masahiro Suzuki

Nobuhiko Saegusa

Jun Kamiyamaguchi

Hitoshi Mochizuki

Takashi Okushima

Tsutomu Tokunaga

Takashi Iwami

Mitsuhiro Ishizuka

Shunsuke Itakura

Kazuo Yahagi

Hiroyuki Urakami

Toyohisa Yuasa

Akira Gotoda

Kazuhisa Ata

A drive method of a plasma display panel that can increase the dark contrast, without causing a discharge failure. When a discharge cell that assumes a black display state in a first field from among first and a second fields that are adjacent in time and switches to a display state representing a brightness other than black in the second field is detected as a lighting transition cell, at least one drive of the below-described first and second forced lighting drives is executed. In the first forced lighting drive, the lighting transition cell is forcibly set into the lighting mode only in the address process of a predetermined subfield within the field in the first field. In the second forced lighting drive, an adjacent discharge cell that is adjacent to the lighting transition cell is forcibly set into the lighting mode only in the address process of the predetermined subfield in the second field.

Drive method of plasma display panel

Prepared is brightness frequency data that indicates the number of pixels, having the same brightnesses in a brightness distribution for each of the fields represented by an input image signal. Based on the brightness frequency data, the number of subfields for emission at each brightness in a brightness region is adjusted for each of at least two brightness regions. As a result, the greater the frequency indicating the total number of pixels at each of the same brightnesses in a brightness region, the larger the number of subfields allocated to that brightness region. Therefore, satisfactory grayscale representation suitable to human visual characteristics is achieved.

Display device

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.

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.

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.

Method of driving a display panel

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.

Driving device for a display panel

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.

Display panel driver device

A display panel drive suppresses dither patterns in a displayed image. Each of the display lines of the panel is divided into M display line groups including a group of [M&#x2245;(k&#x2212;1)+1]th display lines (where M is a natural number, and k is a natural number of n/M or smaller), a group of [M&#x2245;(k&#x2212;1)+2]th display lines, . . . and a group of [M&#x2245;(k&#x2212;1)+M]th display lines. A different offset value is added to pixel data corresponding to each display line group to derive multi-grayscale pixel data. Then, a lighting or extinction mode setting is done based on the pixel data with respect to each pixel cell belonging to the display line groups, each different in at least M subsubfields among subfields constituting a video signal field. In one example, the luminance levels represented by the pixel cells vertically adjacent to one another in a screen are varied.

Display panel driver having multi-grayscale processing function

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. N is smaller than M. N groups of L continuos address steps are prepared from the first to Mth address steps. L is an integer greater than one. The N groups of L continuous address steps are performed in the N lower subfields respectively and sequentially. A second light emission step is performed to cause the pixel cells whose drive mode is the lit mode, to emit light directly before or after the address step group concerned.

Display panel driving method

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.

Display panel driving apparatus

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.

Video signal conversion apparatus delivering enhanced display quality for video signals from film and video sources

A driving method of a plasma display panel capable of executing a dither processing without lowering display quality. When only discharge cells set to a light emission cell state in accordance with input image signals are allowed to emit light a predetermined number of light emissions allotted in accordance with weighting of sub-fields, the number of light emissions to be allotted is rendered different for each discharge cell inside a discharge cell block.

Driving method of plasma display panel

A display panel drive device is provided with: a parallel-to-serial converter for conducting parallel-to-serial conversion on an input signal and outputting a serial signal; a transmission section for converting the serial signal output from the parallel-to-serial converter to a signal complying with a differential serial transmission system and transferring a signal via a transmission line; a reception section for receiving the signal transferred via the transmission line; a serial-to-parallel converter for conducting serial-to-parallel conversion on the signal received by the reception section and outputting a parallel signal; and a drive pulse output section for generating a drive pulse to drive a display panel based on the parallel signal output by the serial-to-parallel converter.

Display panel drive device, display control device, drive device, data transfer system, data transmission device, and data reception device

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. The first drive pattern is carried out by alternating, field by field (frame by frame) in response to the type of input video signals, first and second light-emission drive sequences which have mutually different ratios of the number of times of light-emissions in the light-emission sustaining step during one field (one frame). The second drive pattern is carried out by alternating, field by field (frame by frame) in response to the type of input video signals, third and fourth light-emission drive sequences which have mutually different ratios of the number of times of light-emissions in the aforementioned light-emission sustaining step.

Method for driving a plasma display panel

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. A predicted power consumption of the resonance pulse power circuit is determined based on the pixel data for one field, and the pixel data pulse generation circuit is controlled so as to adjust the power consumption of the resonance pulse power circuit in accordance with the predicted power consumption.

Growing community of inventors

Yamanashi-ken, Japan

Tetsuya Shigeta