Pioneer Corporation

Pioneer Electronic Corporation

Pioneer Display Products Corporation

Panasonic Corporation

Tetsuro Nagakubo

Hirofumi Honda

Tetsuya Shigeta

Masahiro Suzuki

Jun Kamiyamaguchi

Takashi Okushima

Kazunori Ochiai

Takashi Iwami

Hirofumi Kawaguchi

Hiroyuki Urakami

Takeharu Iwata

Toyohisa Yuasa

Manabu Honda

Kazuhisa Ata

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 number of subfields that are to be allocated to a luminance level in an input picture signal is changed in accordance with the peak luminance level in one field's worth of the input picture signal if the luminance level is lower than a predetermined luminance.

Display-panel driving method

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 video signal processing apparatus which performs a frame-rate conversion of a progressive line-scan video signal based on a film source of M film frames per second (wherein M is a natural number) into a video signal in which a same film frame is repeated N times for each 1/M second, and mixes, frame by frame, a video signal of a preceding frame and a video signal of a following frame of the converted progressive line-scan video signal. Thus, the display quality of telecine-converted images can be improved.

Video signal processing apparatus that performs frame rate conversion of a video signal

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 video signal processing apparatus in which an input video signal is written in a frame memory on a line sequential scanning frame unit base in synchronism with a first vertical synchronizing signal and which the line sequential scanning video signal written in the frame memory is read out in synchronism with a second vertical synchronizing signal. The second vertical synchronizing signal having a frequency different from a frequency of a first vertical synchronizing signal is generated in synchronism with the first vertical synchronizing signal of a starting frame of five frames forming a pattern after the conversion in the 2-3 pulldown conversion system when it is judged that the input video signal is based on a telecine-converted video signal.

Video signal processing apparatus

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

In response to operational instructions for changing an image quality parameter accepted in an operation unit, an image signal for displaying at least two identical images based on an inputted image signal on an image plane is generated. Further, an image quality adjusting processing is performed based on an image quality parameter before adjusting image quality with respect to a part of the generated signal for displaying an identical image, and another image quality adjusting processing is performed based on an image quality parameter after adjusting image quality with respect to another part of the generated signal for displaying another identical image.

Image signal processing apparatus and method

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.

Display panel driver

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.

Growing community of inventors

Tokyo, Japan

Tetsuro Nagakubo