Pioneer Electronic Corporation

Pioneer Corporation

Shizuoka Pioneer Corporation

Kenichiro Hosoi

Mitsushi Kitagawa

Naruhiro Sato

Takashi Iwami

Nozomu Kikuchi

Shigeo Ide

Nobuaki Kobayashi

Ryuichi Todoroki

Masanori Ando

Junya Ochi

Yasunori Higuchi

A display controller is disclosed which, when controlling the luminance of an image to be displayed, by controlling the number of sustain pulses forming each of display signals used for a preset display period, stores in a characteristic information storage section a plurality of different characteristic information each for changing the number of sustain pulses in function of the average brightness level of each of video signals corresponding to the image to be displayed, selects one of the stored characteristic information using a selection section, detects the average brightness level of each of the video signals Sin externally supplied for displaying the image, using an APL detection section, sets the number of sustain pulses to be used to display the image by referring to the selected one of the characteristic information based on the detected average brightness level, and applies the set numbers of sustain pulses to a PDP to display the image.

Display controller and display apparatus

A display device is designed to ensure that image processing parameters are transferred in response to switching between input video signals. The display panel is forceably stopped from being driven for a predetermined period when a video signal of an input target is switched over to another video signal.

Display device

A method of and a system for controlling a brightness of a picture displayed on a plasma display panel are provided which are capable of determining whether a video signal to be fed to the plasma display panel is a signal indicating a stationary picture, reducing the brightness of a picture displayed on the plasma display panel if it is determined that a video signal to be fed to the plasma display panel is a signal indicating a stationary picture.

Method of and system for controlling brightness of plasma display panel

A driving apparatus of a plasma display panel which is capable of reducing the scale of the driver itself while limiting power consumed by the plasma display panel. The value of power consumed during a non-light emitting period in one field (frame) period is added to an average luminance level of an input video signal to derive average power consumption, and the power consumed by the plasma display panel is controlled on the basis of the average power consumption.

Driving apparatus for driving a plasma display panel based on power consumed during a non-light emitting period of a unit display period

In a plasma display having a charge recovery type of pulse generator for generating a driving pulse, the charge recovery type of pulse generator is prevented from short-circuiting due to a malfunction of a switch controller in a driving apparatus. A protection gate circuit is provided between the charge recovery type of pulse generator and the switch controller to block an undesirable signal generated due to a malfunction of switch controller for turning on an undesirable switch.

Driving apparatus for plasma display panel

A brightness controlling apparatus adjusts a brightness level of a video signal inputted thereto and outputting the video signal having the adjusted brightness level to a display apparatus so that the display apparatus displays a video image corresponding to the video signal on the basis of the video signal having the adjusted brightness level. The brightness controlling apparatus is provided with: an average brightness level detecting device for detecting average brightness levels of the video signal in a plurality of blocks respectively, the blocks being obtained by dividing the video signal to be displayed on a picture plane by the display apparatus into the blocks; an average brightness level adding device for adding to each other the average brightness levels of the video signal in at least two of the blocks at a vicinity of each other for each of the blocks, which are detected by the average brightness level detecting device; a brightness level setting device for setting the brightness level of the video signal on the basis of the added average brightness levels added by the average brightness level adding device; and an outputting device for outputting the video signal having the brightness level set by the brightness level setting device to the display apparatus as the video signal having the adjusted brightness level.

Brightness controlling apparatus

Disclosed is a driving apparatus for a plasma display panel comprising a group of pairs of row electrodes divided into a plurality of sub-blocks, and a driving pulse generator provided in each sub-block for supplying a driving pulse to the associated sub-block, thereby eliminating non-uniform luminance distribution on the display surface due to variations in voltage of pulses supplied to row electrode in the respective sub-blocks. Output terminals of the pulse generators in the respective sub-blocks are connected to each other to make the voltage levels of at least sustain pulses constant.

A driving apparatus of a plasma display panel which can apply a plurality of driving pulses of different polarities onto same row electrodes of the PDP by a transistor of a low withstanding voltage. The apparatus has a first pulse generating circuit for generating a first pulse of a predetermined polarity and applying it to a first line and a second pulse generating circuit for generating a second pulse of a polarity different from the predetermined polarity and applying it to the row electrodes of the plasma display panel. A switching device which is turned on for at least a period of time when the first pulse generating circuit generates the first pulse and connects the first line and the row electrodes is provided between the first and second pulse generating circuits.

Driving apparatus of plasma display panel

A plasma display apparatus capable of easily implementing stable image display. In generating a priming pulse and a scan pulse by alternately applying the potentials of the positive terminal and negative terminal of a first voltage supply for generating a DC voltage, to row electrodes, the potential of the positive terminal of a second voltage supply with a grounded negative terminal for generating a DC voltage smaller than a voltage of the first voltage supply is applied to the positive terminal of the first voltage supply, thereby shifting the potential of the negative terminal of the first voltage supply on a negative side.

Plasma display apparatus

A convergence correcting device in a CRT display apparatus is free from any necessity of adjustment of a convergence correction rate even if a raster size is changed. The convergence correcting device generates a modified blanking pulse having a pulse width which becomes larger as an amplitude of a deviated voltage becomes larger, and generates a convergence correction signal in accordance with the modified blanking pulse.

Convergence correcting device

In a convergence adjusting apparatus, there are generated waveform signals for adjustment, each level of which becomes zero at a plurality of adjustment points on a display except for one adjustment point. The levels of the waveform signals for adjustment are adjusted in accordance with convergence adjusting signals, and a convergence deflection yoke is supplied with the waveform signals having adjusted levels. In the convergence adjusting apparatus, only a beam spot at any adjustment point subjected to adjustment is moved when convergence adjustment is effected, without affecting adjustment for other adjustment points.

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Fukuroi, Japan

Kenichiro Hosoi