Abstract: Input position is accurately detected not depending on electrode scanning. In an x-detection period of a non-display period, a source drive circuit 3 simultaneously applies to all signal wiring lines a pulse of a peak value proportional to a distance from a gate drive circuit 2. A coordinate detection circuit 8 obtains an x-coordinate on the basis of a voltage induced at a pen 7 corresponding to the peak value (x-coordinate) of the applied pulse. In a y-detection period, a pulse generation circuit 5 applies one pulse to a common line. The pen 7 detects a potential variation in amplitude proportional to a distance (y-coordinate) from the source drive circuit 3, generated approximately simultaneously on all the signal wiring lines via a capacitance. The coordinate detection circuit 8 obtains the y-coordinate similarly to the case of x-coordinate detection. Thus, the input position is detected in a very short time scanning neither the scanning lines nor the signal wiring lines.

Abstract: As a method of driving a liquid crystal display device, the average voltage of reference line drive voltages Vcom for AC-driving a liquid crystal is set higher than the average voltage of signal line drive voltage V0. Moreover, when displaying a plurality of gray scales, the respective voltages are set so that the average voltage of the signal line drive voltages is lowered with a decrease in a voltage difference to be applied to the liquid crystal as an absolute value. In a liquid crystal display device of an opposing signal line structure, a high-quality image display is achieved by compensating for the non-symmetry of the transmissivity of the liquid crystal with respect to positive and negative drive voltages to prevent flickering and image persistence.

Abstract: As a method of driving a liquid crystal display device, the average voltage of reference line drive voltages Vcom for AC-driving a liquid crystal is set higher than the average voltage of signal line drive voltage V0. Moreover, when displaying a plurality of gray scales, the respective voltages are set so that the average voltage of the signal line drive voltages is lowered with a decrease in a voltage difference to be applied to the liquid crystal as an absolute value. In a liquid crystal display device of an opposing signal line structure, a high-quality image display is achieved by compensating for the non-symmetry of the transmissivity of the liquid crystal with respect to positive and negative drive voltages to prevent flickering and image persistence.

Abstract: A liquid crystal display device has a liquid crystal layer between a glass substrate and a counter substrate. A TFT and scanning lines which control the TFT are provided on the glass substrate. On the counter substrate, a gradation signal line which is connected to a counter electrode applying a voltage to the liquid crystal layer is provided opposite to the scanning lines. A sealing section for sealing the liquid crystal of the liquid crystal layer is provided while enclosing the display area between the glass substrate and the counter substrate. The sealing section has conductive particles. Upper contact pads connected to the gradation signal lines and lower contact pads on the glass substrate are electrically connected via the conductive particles. This realizes a liquid crystal display device with a smaller frame and makes the mounting compact in size without causing poor connection due to line breakage.

Abstract: A metal-plated aromatic polyimide film composed of an aromatic polyimide resin film, a surface layer of which contains a dispersed palladium metal or a palladium compound, and a metal layer which is chemically plated on the surface layer of the polyimide resin film. The surface layer is preferably formed by placing a palladium compound on a self-supporting aromatic polyimide precursor film and heating the self-supporting film having the palladium compound on its surface layer to a temperature at which the polyimide precursor is converted into its corresponding aromatic polyimide.

Abstract: A liquid crystal display in which a reference signal main line, placed so as to connect reference signal lines to each other, is separated into an input main line and an output main line in an insulating state from each other. Then, a voltage application line from a voltage-application circuit for controlling the voltage of a reference signal is connected to the input main line and a voltage feedback line therefrom is connected to the output main line. Thus, it becomes possible to accurately detect minute voltage variations within a reference signal circuit and compensate for them.

Abstract: A metal film/aromatic polyimide film laminate is composed of a composite aromatic polyimide film and a metal film, in which the composite aromatic polyimide film is composed of an aromatic polyimide substrate film having a linear expansion coefficient of 5×10−6 to 30×10−6 cm/cm/° C. in the temperature range of 50-200° C. (measured in machine direction), and a thin aromatic polyimide layer of polyimide prepared from a carboxylic acid component comprising a mixture of 3,3′,4,4′-biphenyltetracarboxylic dianhydride and 2,3,3′,4′-biphenyltetracarboxylic dianhydride in a molar ratio of 50:50 to 90:10 and an aromatic diamine component composed of 1,3-bis(4-aminophenoxy)benzene or a mixture of 1,3-bis(4-aminophenoxy)benzene and p-phenylenediamine and/or diaminodiphenyl ether in a molar ratio of 10/90 or more. Tg of the thin polyimide layer is 210-310° C. The metal film is fixed to the thin polyimide layer at a 90° peel resistance of 0.

Abstract: An electronic device includes on a substrate: a plurality of first capacitors each including a first electrode and a second electrode opposing the first electrode via a first dielectric layer; a plurality of second capacitors each including a third electrode electrically connected to the first electrode and a fourth electrode opposing the third electrode via a second dielectric layer; a first line whose electrical connection to the first electrode and the third electrode is turned ON/OFF by a first switching element; a second line electrically connected to the second electrode at least temporarily; a third line whose electrical connection to the fourth electrode is turned ON/OFF by a second switching element; and a fourth line whose electrical connection to the fourth electrode is turned ON/OFF by a third switching element.

Abstract: An active matrix substrate includes: a base plate; pixel electrodes formed on the base plate; pixel switching elements, each being connected to associated one of the pixel electrodes; gate lines for controlling operations of the pixel switching elements; data lines, each being connected to associated ones of the pixel electrodes by way of associated ones of the pixel switching elements so as to supply a data signal therethrough; data line switching elements, each having one of its terminals connected to associated one of the data lines; signal input terminals, each being electrically connected to another terminal at associated ones of the data line switching elements; a data line branching section provided between the signal input terminals and the data line switching elements; and a control line connected to the data line switching elements to selectively turn ON or OFF the data line switching elements.

Abstract: An object of the present invention is to provide an active matrix type liquid crystal display apparatus, capable of being upsized and having enhanced resolution at low cost without being degraded in display quality. In the liquid crystal display apparatus, on a pixel substrate, scanning lines and reference signal lines are formed in a row direction, and on a counter substrate, gradation signal lines are formed in a column direction. A liquid crystal layer is sandwiched between the pixel substrate and the counter substrate. Outside an image display region, a reference signal transfer pad is disposed on the counter substrate opposite to a main reference signal line for connecting end portions of reference signal lines. The reference signal transfer pad and the main reference signal line are electrically connected by conductive material.

Abstract: An LCD is provided, the LCD including a color filter substrate with tapering color filter portions overlapped by electrode and/or black matrix layers. The other substrate (e.g., active matrix substrate) may include pixel electrodes, address lines, and switching elements.

Abstract: An aromatic polyimide film of polyimide composed of a 3,3′,4,4′-biphenyltetracarboxylic acid component and a p-phenylenediamine component, which has a thickness of 35 to 55 &mgr;m and is employed for manufacturing a polyimide film/metal film laminate, preferably has a linear thermal expansion coefficient of 17×10−6 to 24×10−6 cm/cm/° C. (TD) in the temperature range of 50-200° C., and a modulus of tensile elasticity of 700 kgf/mm2 or more (TD), and has a surface having been subjected to discharge treatment.

Abstract: It is an object of the invention to reduce a leakage low-frequency electric field from a panel section of a matrix type. In the case where a panel section has a usual current structure in which the panel section has a single common electrode elongating over the whole of the display region of the panel section, the maximum voltage difference of a reference signal supplied to the common electrode is defined to be 0.3678×x−0.6136 (wherein x is the area of the display region) or less. In the case where the panel section has the so-called counter source structure and a plurality of column electrodes, the maximum voltage difference of a reference signal supplied to the column electrodes is defined to be ax−b (wherein a=0.3565×y−0.6829, b=−0.0937y+0.7091, and y is a ratio of the area of all the column electrodes to the area of the display region) or less.

Abstract: An aromatic polyimide laminate composed of an aromatic polyimide composite film, a metal film, and a release film is disclosed. The aromatic polyimide composite film is composed of an aromatic polyimide substrate film and two thermoplastic aromatic polyimide layers. Each thermoplastic layer is fixed to each surface of the substrate film. The substrate film has no glass transition temperature of lower than 350° C., and the thermoplastic aromatic polyimide layer has a glass transition temperature of 190-280° C. The metal film is fixed, with no intervening adhesive layer, to one thermoplastic aromatic polyimide layer at a 90° peel strength of 0.8 kg/cm or more and the release film is fixed, with no intervening adhesive layer, to another thermoplastic aromatic polyimide layer at a 90° peel strength of 0.001-0.5 kg/cm, under such condition that the latter peel strength is one half or less of the former peel strength.

Abstract: A polyimide film favorably employable in a method of producing a through-hole in an aromatic-polyimide film having on its surface a laminated or deposited metal film by applying laser beam onto the polyimide film, preferably is composed of a high Tg aromatic polyimide layer which has a Tg of 300° C. or higher or has no noticeable Tg and is produced from a biphenyltetracarboxylic acid compound and an aromatic diamine compound and a low Tg aromatic polyimide layer which has a Tg of lower than 375° C. but higher than 200° C., provided that the Tg of the low Tg polyimide layer is lower than the Tg of the high Tg polyimide layer and the metal film is laminated or deposited on the surface of the low Tg polyimide layer on the side not facing the high Tg polyimide layer.

Abstract: Oxamide is produced in a high purity by a process comprising (A) melting a starting material comprising 70 to 100 wt % of an oxalic acid diester of an aliphatic alcohol and 0 to 30 wt % of the same aliphatic alcohol as mentioned above, (B) feed-mixing an ammonia-containing gas to the starting material melt, while stirring, to produce oxamide and the aliphatic alcohol (by-product), (C) continuing the ammonia-feed-mixing procedure while controlling a feed rate of ammonia to an extent such that a content of the aliphatic alcohol in the reaction mixture is maintained at a level of 3 to 45% by weight, to produce a wetted solid reaction product comprising the resultant oxamide and the aliphatic alcohol, and then (D) collecting the oxamide from the reaction product by evaporating away the aliphatic alcohol.

Abstract: In an image display device which employs pulse width modulation driving, a voltage which is less than a voltage supplied to signal lines is applied to pixel electrodes. Tones are displayed by shifting phases of waveforms of the signal lines and scanning lines, and polarities of pixels in a signal line direction are inverted alternately. This prevents increase in power consumption which is caused by pulse intervals which become too small at high tone levels, in addition to preventing change in tone level due to external factors such as temperature, or signal delays in a driver or wiring.

Abstract: A roll of a web composed of an aromatic polyimide composite film and a metal film in which the polyimide composite film is composed of a non-thermoplastic aromatic polyimide base film and a thermoplastic aromatic polyimide cover film, the polyimide composite film showing a heat shrinkage ratio of less than 0.1% at 300° C., can be produced by heating a corresponding roll of web composed of a metal film and an aromatic polyimide composite film having a heat shrinkage ratio of more than 0.1% at 300° C., at a temperature between 150° C. and a glass transition temperature of the thermoplastic aromatic polyimide cover film, for a period of at least one minute.

Abstract: A pixel substrate of a liquid crystal display device of the present invention are equipped with gate bus lines, reference signal lines, gate signal input terminals, a reference signal trunk line, and reference signal input terminals. The reference signal trunk line is formed so as to run along all side edges of the pixel substrate except the left side edge which is on the gate signal input side, outside a display area of the pixel substrate (an area corresponding to a display area of a liquid crystal panel when completed), and is connected with every reference signal line. A sealing member for making the pixel substrate and a counter substrate adhere to each other is provided so as to be positioned on the reference signal trunk line 7.

Abstract: A flexible aromatic polyimide film/metal film composite sheet is composed of a multi-layered polyimide film having a highly heat-resistant aromatic polyimide layer to one surface of which is bonded another aromatic polyimide layer (in which the multi-layer polyimide film is prepared by simultaneous casting), and a metal film which is bonded to the latter polyimide layer by heating under pressure and subsequent cooling under pressure using a double belt press.