Fujitsu Hitachi Plasma Display Limited

Other

Kosaku Toda

Toshio Ueda

Takayuki Ooe

Shigeo Mikoshiba

Kyoji Kariya

Tomokazu Shiga

Akira Yamamoto

Takahiro Yamaguchi

Yoshikazu Kanazawa

Tsutae Shinoda

Hirohito Kuriyama

Shigeharu Asao

Ayahito Kojima

Kiyoshi Igarashi

Kazuki Sawa

Makiko Yamada

Yiwen Zhu

A method of driving a display device has a calculating step, a comparing step, and a controlling step. The calculating step calculates a total number of light-emission pulses within a field, based on an average of display load factors in at least two fields, the comparing step compares the calculated number of light-emission pulses with a number of light-emission pulses based on power consumption, and the controlling step controls a smaller display load factor as the total number of light-emission pulses within a field.

Display device capable of controlling power consumption without generating degradation in image quality, and method of driving the display device

The method of driving a display apparatus, in which the gradation scale is represented, by the subfield method, with less flicker even when driven at a frequency of 50 Hz has been disclosed. In this method, the two most weighted subfields (subfields of Bn brightness and Bn&#x2212;1 brightness when it is assumed that the frame is composed of n subfields and the brightness of n subfields is Bi (i=1&#x2212;n; B&#x2266;B. . . Bn&#x2212;1&#x2266;Bn)) are arranged at the interval of about half the length of the frame. Because of this, there exist two peaks of the light emission intensity in a frame, the interval being about half the length of the frame, and if the display apparatus is driven at a frequency of 50 Hz and the length of the frame is 20 ms, the variation period of the light emission intensity is 10 ms and the light emission intensity varies at 100 Hz, therefore, flicker is not detected.

Method of driving display apparatus and plasma display apparatus

A method of driving a display device assumes a specific pixel on a retina that is formed on the retina based on an input image, and controls light emission of each subframe such that luminance of a specific pixel on the retina becomes substantially equal to luminance of a pixel corresponding to the input image. The display device is driven by constructing one frame with a plurality of subframes, for displaying the input image that moves on a display panel.

Method of driving display device capable of achieving display of images in higher precision without changing conventional specifications of panel

A plasma display panel has a plurality of first electrodes, a plurality of second electrodes adjacently disposed alternately with the first electrodes, first display lines formed between the first electrodes and the second electrodes adjacent to one side of the first electrodes, second display lines formed between the first electrodes and the second electrodes adjacent to the other side of the first electrodes, and a control circuit for alternately lighting the first and second display lines or lighting only one of the first and second display lines, and for displaying an image on the plasma display panel by dividing a frame or a field into a plurality of sub-fields for a gradation display. When cells are lighted on the adjacent first display lines or on the adjacent second display lines in a direction crossing the first and second electrodes, a compensation sustain discharge is carried out a plurality of times on the second display lines or on the first display lines positioned between the adjacent first display lines or between the adjacent second display lines, after a sustain discharge period on the first or second display lines ends.

Plasma display panel and method of driving the same capable of increasing gradation display performance

A method of driving a display panel, and a panel display apparatus, in which displays do not lack realism even when power control is performed, have been disclosed. In the display panel driving method, the display frame for a screen is comprised of plural subframes, each being assigned a number of times discharge for light emission is performed according to the specified luminance relation, the representation with gray scale is performed by combining the subframes that display according to the intensity of the input image signal for each cell, and the power consumption is controlled by both the control of the total number of times discharge for light emission is performed of the display frame and the control of the gain of the input image signal.

Method of driving display panel and panel display apparatus

A method of displaying a dynamic halftone image on a display panel made of pixels divides each frame of the image into subframes and turns on and off the subframes. The method includes the steps of finding a line of pixels that simultaneously display a specific intensity level in a frame and another specific intensity level in the next frame, counting the number of pixels in the line, selecting corrective pulses, which turn on/off corresponding subframes to enable/disable corresponding intensity levels, according to the counted number and a change in the specific intensity levels between the frames, and adjusting original display signals for the pixels in the line according to the corrective pulses, respectively. The method eliminates halftone disturbance and false color contours from the image even if the moving speed of the image on the display panel is high.

Method of and apparatus for displaying halftone images

A halftone display method utilizes an activation sequence, having a plurality of luminance blocks predefined in each frame or field to display an image and having redundancy, that enables one gray-scale level to be expressed by any one of a plurality of combinations of subframes (luminance blocks). When determining luminance blocks for use to display gray scale of an arbitrary first pixel, the luminance blocks to be used for the first pixel are selected in accordance with a predetermined rule, based on how the luminance blocks are used for a second pixel located in close proximity to the first pixel. In this way, by actively utilizing the redundancy of the activation sequence, the occurrence of moving-image false contours (false color contours) in video can be minimized, and also a motion compensation equalizing pulse method can be effectively applied to further improve the image display quality.

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Kawasaki, Japan

Kosaku Toda