Pioneer Corporation

Pioneer Display Products Corporation

Panasonic Corporation

Panasonic Corportion

Shigeru Iwaoka

Tsutomu Tokunaga

Nobuhiko Saegusa

Kazuo Yahagi

Mitsushi Kitagawa

Yoshichika Sato

Takashi Iwami

Kazuaki Sakata

Hideto Nakamura

Motofumi Ikeda

Masaru Nishimura

Yuya Shiozaki

Mitsunori Taguchi

Ryo Suzue

Kenichiro Hosoi

Takeharu Iwata

A plasma display device which selectively generates address discharge in each display cell in accordance with pixel data based on a video signal in an address period, applies a sustain pulse between row electrodes forming each row electrode pair in a sustain period, and applies, in the sustain period, a discharge timing control pulse to one row electrode of each row electrode pair, so that the discharge timing control pulse partly overlaps with a first sustain pulse in terms of time, which is applied to the other row electrode of each row electrode pair.

Plasma display device

A plasma display device which comprises a magnesium oxide layer formed on a plane in contact with the discharge space in each display cell of a plasma display panel, having magnesium oxide crystals that perform cathode luminescence light emission with a peak in a wavelength band of 200 to 300 nm as a result of excitation caused by electron-beam irradiation. Each of the display cells is set in a lit cell state or an unlit cell state by selectively inducing an address discharge, and only the display cells set in the lit cell state are caused to perform a sustain discharge by applying a sustain pulse after the selective scanning has ended.

A method of driving a display panel is provided which can reduce power consumption. During a unit display period, the number of times of second and subsequent selective erase operations performed on one display cell of each pixel is different from the number of times of second and subsequent selective erase operations performed on another display cell emitting light of different color from that of the one display cell.

Driving method of a display panel

A method for driving a display panel with which the dark contrast can be improved is provided. Each of at least two successive sub-fields including a leading sub-field includes a selective write addressing step for setting the discharge cells to a lighted discharge cell mode by selectively causing a writing discharge in the discharge cells in accordance with the video signal. The sub-fields following at least two sub-fields include a selective erasure addressing step for setting the discharge cells to an unlighted discharge cell mode by selectively causing an erasing discharge in the discharge cells in accordance with the video signal and an emission sustain step for repeatedly causing a sustain discharge corresponding to a weighting of that sub-field only in the discharge cells that are in the lighted discharge cell mode. The last sub-field of each field includes a first erasing step for inducing a first erasing discharge between the column electrode and one of the row electrodes of the row electrode pair belonging to the discharge cells that have been set to the unlighted discharge cell mode in the selective erasure addressing step and a second erasing step for inducing a second erasing discharge between the row electrodes of the row electrode pair belonging to the discharge cells that have been set to the lighted discharge cell mode in the selective write addressing step, the first erasing step and the second erasing step being performed immediately after the emission sustain step.

Method for driving display panel

A driving method for a plasma display panel realizes a high quality display at low power consumption while restraining a false contour. After a selective discharge for setting discharge cells to a light-on state or a light-off state is generated in one subfield of N subfields constituting each field, the selective discharge is generated again only in subfields placed at predetermined positions from the beginning of each field.

Driving method for plasma display panel

The present invention is a display device and display panel drive method that allow a more rapid select operation to be stably implemented by increasing the discharge probability of selective discharge. The display device comprises an address part that sequentially applies a positive scan pulse to a first row electrode of each of the display panel row electrode pairs in the address cycle while sequentially applying a pixel data pulse corresponding to the pixel data at the same timing as the scan pulse to each of the display panel column electrodes one display line at a time so that the column electrode side constitutes a cathode, such that an address discharge is selectively produced in the second discharge cell; and a sustain part that applies a sustain pulse to each of the row electrodes constituting the row electrode pairs in the sustain cycle, and the sustain part applies the ultimate sustain pulse of the sustain pulses applied in the address cycle to the first row electrode with a negative polarity.

Display device and display panel drive method

A display panel includes a plurality of unit light emission areas (light emission elements) arranged in a matrix. Each unit light emission area is defined by a first discharge cell and a second discharge cell. The second discharge cell has a light-absorbing layer. When the display panel is driven to express an image having a plurality of gradation levels, address discharge is selectively caused in the second discharge cells in accordance with an input image signal. Light leaks to the first discharge cell from the second discharge cell upon the address discharge. This light is used to express the gradation of low luminance. Since luminance difference between gradation levels of a low luminance image is reduced, it is possible to display a high quality, low luminance image.

Method of driving a display panel

A display and a driving method of a display panel capable of improving a dark contrast. In driving the display panel having light-emission areas formed at each intersection of a plurality of pairs of row electrodes and a plurality of column electrodes, each of the light-emission areas having a first discharge cell including a portion where the respective row electrodes in pair are opposed to each other with a predetermined discharge gap within a discharge space and a second discharge cell including a portion where a light absorptive layer is provided and one row electrode of the row electrode pair and the other row electrode of the row electrode pair adjacent to this row electrode pair are opposed to each other with a predetermined discharge gap, an address discharge is produced within the second discharge cell, to set the second discharge cell at a light-on state or a light-off state, by applying a pixel data pulse based on an input image signal, to respective column electrodes, while applying a scanning pulse to a row electrode having the longer distance to the first discharge cell, of the respective row electrodes within the second discharge cell. This structure causes the address discharge within the second discharge cell relatively distant from the first discharge cell, so that the amount of a ultraviolet ray by the address discharge flowing into the first discharge cell is reduced, to suppress the deterioration of the dark contrast.

Display and display panel driving method

A plasma display apparatus which is capable of reducing power consumption and achieving a high definition display. A plasma display panel has a plurality of first row electrodes and second row electrodes extending in a horizontal direction and formed in alternation, a discharge space filled with a discharge gas, and a plurality of column electrodes formed opposite to and extending in a direction perpendicular to the first row electrodes and the second row electrodes through the discharge space. The plasma display panel also has discharge cells corresponding to pixels, formed at respective intersections of the first row electrodes and second row electrodes with the column electrodes, and a spacing between each of the first row electrodes and each of the second row electrode is conformed to a display line on the screen. A reset discharge is caused to occur for forming wall charges in all of the discharge cells; a selective erasure discharge for selectively erasing the wall charges formed in the respective discharge cells in accordance with an input video signal; and a sustaining discharge for forcing only those discharge cells formed with the wall charges to repeatedly emit light. According to a second aspect of the present invention, a plasma display apparatus comprises a capacitor, a first switching current path for selectively discharging a charge accumulated on the capacitor to supply the charge to a power supply line, a second switching current path for selectively applying a power supply potential to the power supply line, a third switching current path for selectively charging the capacitor with charges accumulated on column electrodes through the power supply line, and a pixel data pulse generator circuit for connecting the power supply line to the column electrodes for a predetermined period of time in response to the input video signal to generate pixel data pulses corresponding to the input video signal and applying the pixel data pulses onto the column electrodes.

Growing community of inventors

Yamanashi-ken, Japan

Shigeru Iwaoka