Matsushita Electric Industrial Co., Ltd.

Toshiba Matsushita Display Technology Co., Ltd.

Atsuhiro Yamano

Hitoshi Tsuge

Hiroshi Takahara

Masafumi Kubota

Kenji Harafuji

Noboru Nomura

Tokuhiko Tamaki

Tetsuya Ueda

Satoshi Ueda

Kousaku Yano

Yoshito Date

Kunio Sekimoto

Katsumi Adachi

In a display panel, a dummy pulse of a predetermined voltage signal is superimposed on a data signal and the dummy pulse has an amplitude much larger than the amplitude of the data signal, and thus a signal waveform applied to a light modulation layer such as LC layer is changed to a high frequency wave. The applying position of the dummy pulse is varied according to each color of R, G and B, or varied according to frame or field. By performing a MLS drive with the dummy pulse superimposed on the data signal, the amplitude difference between the selection signal and the data signal can be reduced. Thus, a common driver IC and a segment driver IC can be formed as one semiconductor chip to be placed on one side, constructing a three side free type.

Display unit and drive system thereof and an information display unit

An output circuit for gray scale control includes a low-side current mirror unit, a low-side gray scale control circuit, a high-side current mirror unit, a high-side gray scale control circuit, a current increment control circuit and a selective precharge control circuit. A gray scale control circuit for outputting gray scale signals is separated into the high side and the low side, thereby enabling the output-current characteristics to be controlled to be close to the &#x3b3; characteristics of a light emitting device. In addition, variations in the current for each output unit can be suppressed by using multistage current mirrors.

Output circuit for gray scale control, testing apparatus thereof, and method for testing output circuit for gray scale control

An image display device comprises a first storage device () for storing an image data, an image processor () for reducing the number of bits of the image data, a second storage device () for storing the image data after being processed, a display device () for displaying the image data after being processed, a driver () for driving the display device () and a controller () for controlling the operation of the driver (). The controller () determines whether the image data stored in the first storage device () is dynamic or static, and, in the case of a static image, after storing the signals corresponding to one frame of the image data in the second storage device (), operates only the second storage device (), the driver () and the display device (). Thereby, reduction of power consumption can be achieved while maintaining high image quality.

Image display device

In a display device capable of low power and multi-color displaying without raising a frame rate due to increase of display gradations in number by combining a gradation representation through a FRC and a gradation representation system using a pulse width modulation or pulse height modulation method, the gradation representation is executed by a method of pulse width or pulse height modulation in one frame using lower significant N bits to a video signal of M bits, and the display of the gradations is performed by the FRC of the present invention using more significant M&#x2212;N bits and further using 2&#x2212;1 frames, and thus the number of the frames required for FRC is reduced to decrease a frame frequency to thereby realize a gradation display with reduction of electric power and suppression of flickers.

Matrix display and its drive method

Metal wires are formed side by side over a semiconductor substrate, with an interlayer insulating film interposed between the metal interconnections and the semiconductor substrate. The metal interconnections are covered with a passivation film composed of a lower silicon oxide film and an upper silicon nitride film. The silicon oxide film is deposited so that the maximum thickness of the portions of the silicon oxide film on the side faces of the metal interconnections is less than half of the minimum space between the metal interconnections. The silicon nitride film is deposited so as to be interposed between the portions of the silicon oxide film on the side faces of the adjacent metal interconnections.

Semiconductor device and method of fabricating the same

Magnetic coils are provided around a plasma generation chamber. To the plasma generation chamber is supplied a microwave which is generated by a microwave generator. Electron cyclotron resonance is caused by the interaction between a magnetic field produced by the magnetic coils and the microwave generated by the microwave generator, so as to accelerate electrons in the plasma generation chamber. The electrons thus accelerated generates a plasma. A reaction chamber is provided underneath the plasma generation chamber. The plasma generated in the plasma generation chamber is introduced to the reaction chamber to be used for etching a material on a sample stage. A reflex klystron is used as the microwave generator. By changing the cavity length of the reflex klystron, the resonance frequency of the cavity resonator is varied, thus modulating the frequency of the microwave supplied to the plasma generation chamber by the microwave generator.

Dry etching method and dry etching apparatus

A dry etching method of a substrate or layer of a semiconductor or other material which includes the steps of providing a metallic chamber having an anode and a cathode which are spaced from each other and mounting the substrate or layer to be etched on the cathode, and applying a potential from a RF power supply to the cathode so that a plasma is generated between the anode and the cathode to produce a bulk region and sheath regions between the cathode and the anode. The frequency of the RF power supply is set at a level higher than 13.56 MHz under which the substrate or layer is subjected to etching with the ions. A polysilicon, SiN or Al alloy layer can be efficiently etched with a Cl-based etching gas.

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Hyogo, Japan

Atsuhiro Yamano