Fujitsu Corporation

Shizuo Andoh

Kazuo Yoshikawa

Hisashi Yamaguchi

Tsutae Shinoda

Toyoshi Kawada

Kazuhiro Takahara

Hideaki Takizawa

Keizo Kurahashi

Kenji Murase

Seii Sato

Yoshinori Miyashita

Toru Asano

Tetsuya Kobayashi

Tadashi Hasegawa

Masayuki Wakitani

Tadatsugu Hirose

Hideo Yamashita

Yoichi Ueda

Takayuki Hoshiya

Shoshin Miura

Norihiko Nakayama

Toshiaki Iemori

Michihiro Shimizu

Yoshimi Sugimoto

Hideo Sei

Hiroyuki Gondoh

Shintaro Kisumi

Shozo Umeda

An EL device having an electrode arrangement including first electrodes and at least one row of second electrodes intersecting the first electrodes and energized by a combination of the first and second electrodes. The second electrodes are divided into a plurality of sub-electrode portions. The electrode arrangement is such that the first electrodes each comprise a plurality of segments that are commonly-connected and intersect different sub-electrode portions. Another electrode arrangement is such that the first electrodes are arranged in a belt form and intersect different sub-electrodes portions in a meander manner. The EL device can be applied to an electrophotographic printing system as an optical system for forming a latent image. EL elements are repeatedly energized with the same data to give a sufficient intensity of light on a light sensitive medium, and deenergized for a time in which the intensity is decreased to a low level.

Electro luminescence device and electrophotographic printing system

Disclosed here is a panel structure for a large size display which utilizes the gas discharge panel called the surface discharge type panel. Among a pair of substrates arranged face to face in order to define the gas discharge space, the one substrate which is used as the electrode supporting substrate is composed of the composite substrate body where plurality of small size substrates which can be produced comparatively easily with high production yield are combined in such a form that the side edge surfaces of said substrates are aligned face to face, while the other substrate which is used as the covering substrate is composed of a large size single substrate in such a size same as said composite substrate body. Such substrate structure realizes a large size gas discharge panel having a high production yield, without requiring the large scale production facility.

Gas discharge panel

A coordinate detecting apparatus for determining the coordinate data of a point on a plane by indicating the point with a touch of a fingertip or other load to the point. The apparatus comprises a transparent resistive film forming the plane (touch panel) and a buffer circuit operating as a voltage follower circuit having substantially infinate input impedance. The buffer amplifier is operatively connected between each selected pair of facing ends of a substantially rectangular region of the resistive film, and equalizes the potentials at the ends. The change of the impedance between one of the ends and the ground is detected in accordance with the touch of the fingertip to the touch panel and is used as an original coordinate data. Further modifications concerning the avoidance of degradation in the detection quality due to fluctuations of the impedance provided by the touch of a fingertip, for example, and the methods to perform 2-dimensional coordinate detection are described.

Coordinate detecting apparatus

In driving a thin film EL display panel providing the matrix arrangement of translucent data electrodes and metal scanning electrodes, the data pulse is supplied to the selected translucent data electrodes in such a relation that it rises in advance of the scanning pulse to be supplied to the opposing metal scanning electrodes. Thereby, fluctuation of brightness due to the influence of electrode resistance of the translucent data electrodes can be eliminated, and a uniform and distinct display can be attained.

Method for driving a matrix type display

A new type touch sensing device comprises a touch panel with a plurality of transparent touch electrodes, a LC parallel resonant circuit connected to the touch electrode and an oscillation circuit. The LC resonant circuit has a resonant point on a same frequency with the oscillation frequency of the oscillation circuit. The touch/non-touch condition to the touch electrode is detected as a change of voltage value at the connecting point of the LC resonant circuit and touch electrode with an increased ON-OFF ratio.

Touch sensing device

An AC plasma display panel with a coated thin film dielectric layer on the electrodes has a structure which includes double layers of chromium (Cr) and copper (Cu). After three metal layers of chromium, copper, and chromium are formed on a glass substrate, these three metal layers are subjected to patterning with the desired electrode pattern in such a fashion as to eliminate the upper chromium layer. Then, a thin dielectric film of alumina (Al.sub.2 O.sub.3) is evaporated onto the two remaining metal layers forming the electrodes. This combination of two layer metal electrodes and dielectric layer is very useful in providing a self-shifting plasma display panel having high quality and reliability.

Gas discharge panel having plurality of shift electrodes

A self shift type gas discharge panel in which pluralities of buses are respectively provided on a pair of substrates disposed opposite each other, electrodes are respectively connected to the buses and shift channels are set up in row and column directions with arrays of discharge points formed between the opposed electrodes of the substrates to enable shifting of a discharge spot in the row or column direction. On the substrates, the electrodes and the buses are so arranged as not to intersect each other, which allows ease in the manufacture of the discharge panel and ensures stable shifting of the discharge spot.

Self shift type gas discharge panel

The gas discharge panel described here is an AC plasma display panel with electrodes arranged on a substrate, and the electrodes and substrate are coated with a dielectric layer for insulation from the gas filled discharge space, with an improvement in the dielectric layer surface. The improvement being an overcoat layer of at least two alkaline earth compounds, especially CaO and SrO, provided on the dielectric layer surface of this display panel. This overcoat layer significantly lowers the operating voltages of the panel.

A gas discharge panel provides one or more shift channels for discharge spots, said shift channel (s) being composed of 2 or more electrode groups on each of a pair of substrates arranged oppositely across a discharge gap. Electrodes of each group are provided alternately and periodically on each substrate with the electrode patterns on each substrate such as to define said shift channel(s). The electrode layout eliminates the need for crossover areas in the leading out of electrodes and is very useful for realizing high resolution and low cost AC driven self-shift plasma display panels.

A pulse driven self-shift plasma display panel characterized by having meander type shift channels for shifting a discharge spot. Each meander type shift channel is composed of an array of discharge cells defined in the discharge gap at the crossing points of electrodes arranged on parallel substrates, the electrodes on one substrate being oriented generally transversely to those on the other substrate, and barrier structure for determining the meander route being provided. Data in the form of a discharge spot is written in at one end of a shift channel and is shifted by the pulse shift voltages with various phases over the meander route for display at the desired positions. The barrier structure may also be formed using photo-luminescent phosphor material to create desired colored display effects.

A gas discharge panel in which a pair of substrates each has provided thereon a plurality of buses and a plurality of electrodes regularly connected to the buses, and in which the substrates are disposed opposite to each other with a discharge gas sealing space defined therebetween. By applying switching voltages to the buses, discharge spots between pair of opposed electrodes are sequentially shifted. No cross-over parts for electrode connections are present on the substrates.

Plasma display panel including shift channels and method of operating

In conjunction with an AC plasma display panel a light detecting pen is employed to designate coordinate points on the panel. Circuitry is employed to scan the electrodes of the panel with sustain voltage pulses at predetermined intervals and determine the coincidence of a selectively applied sustain voltage pulse with light detected by the light pen to indicate the location of the light pen with respect to the panel. A negative scanning method is also disclosed wherein coincidence between a sustain voltage pulse which is selectively not applied and the non-detection of light indicates the location.

Method and apparatus for detecting the location of a light detecting pen

An improved method and apparatus to shift discharge spots produced in a gas discharge display panel, in accordance with given input information so that said discharge spots may be display-held in a desired display position. The shift operation is performed by supplying shift voltages sequentially to shift electrodes. A feature of this invention is to oscillate the discharge spots while they are being display-held in a display position, by supplying an operating voltage alternately to adjacent two shift electrodes during a display period. By oscillating the discharge spots during the display period, an operation margin is obtained which is equivalent to the operation margin available during the shift period, and operation of said display panel can be stabilized to avoid misfiring.

Method and apparatus for driving a gas-discharge display panel

A drive system for an alternating current (AC) driven type gas discharge panel in which either one of the electrode pitches of X and Y electrodes is made smaller than the other. A positive pulse voltage is applied to the electrodes of the smaller electrode pitch and a negative pulse voltage is applied to the electrodes of the larger electrode pitch, thereby to write information in a selected discharge point. The AC driven type gas discharge panel of an electrode arrangement of an asymmetrical electrode pitch is driven with a maximum write margin which does not cause half select misfire.

Gas discharge panel drive system

A gas discharge panel includes several pairs of column (X) electrodes arranged on a first substrate and several pairs of row (Y) electrodes arranged on a second substrate, the column and row electrodes being orthogonally oriented and in spaced, opposed relation to define therebetween a gap filled with an ionizable gas. In a first driving configuration, a corresponding electrode of each pair of (X) electrodes is selectively driven by an (X) address driver and similarly a corresponding one of each of the (Y) electrode pairs is selectively driven by a (Y) address driver. The other electrode of each of the (X) and (Y) electrode pairs then is connected in common to respective (X) and (Y) sustain voltage driver terminals. In a further embodiment, each of the (X) and (Y) electrode pairs is arranged in corresponding groups of electrode pairs, each group including a common number of such pairs. First electrodes of each pair of each group are connected to a common output terminal of an address and sustain voltage driver; thus, plural address and sustain voltage driver outputs corresponding to the plural groups are employed for each of the (X) and (Y) electrode pairs. The second electrodes of corresponding pairs of the plural groups are connected to respectively corresponding, further common output terminals of address and sustain voltage drivers; thus, a plurality of further common terminals corresponding to the number of electrode pairs in each group are provided, as to each of the (X) and (Y) electrodes. The panel as thus configured affords decoding of addressing signals applied to the common terminals by means of plasma coupling within the panel whereby the discharge point or cell defined by a desired electrode of each of the column and the row electrode pairs can be addressed selectively. A further embodiment provides shifting of the display to successive positions in either the (X) or (Y) directions.

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Kobe, Japan

Shizuo Andoh