摘要:
A circuit is disclosed for driving an OLED in a graphics display. The circuit employs a current source operating in a switched mode. The output of the current source is connected to a terminal of the OLED. The current source is responsive to a combination of a selectively set cyclical voltage signal and a cyclical variable amplitude voltage signal. The current source, when switched on, is designed and optimized to supply the OLED with the amount of current necessary for the OLED to achieve maximum luminance. When switched off, the current source blocks the supply of current to the OLED, providing a uniform black level for an OLED display. The apparent luminance of the OLED is controlled by modulating the pulse width of the current supplied to the OLED, thus varying the length of time during which current is supplied to the OLED. By using a switched mode of operation at the current source, the circuit of the present invention is able to employ a larger range of voltages to control the luminance values in a current-driven OLED display.
摘要:
A direct distribution wiring system is provided which facilitates the effecting of repair or engineering change in a Multi-chip module (MCM) while eliminating the need for redistribution and/or buried connections between IC attachment pads and engineering change pads, thus eliminating the need for patterned conductor layers corresponding to such functions. The operation of the MCM is improved by the wiring system allowing the reduction of lumped capacitances by disconnection of defective conductors, accomplished by providing severable connectors in a direct distribution structure, as well as the elimination of redistribution wiring layers and increased IC density on the MCM. Full potential fault coverage as well as full discretion in reversible engineering changes is provided by forming all elements of the wiring system on the surface of the device.
摘要:
A self-aligned metal integrated circuit structure is described which achieves self-aligned metal to silicon contacts and sub-micron contact-to-contact and metal-to-metal spacing. The insulation between the contacts and the metal is a pattern of dielectric material having a thickness dimension in the order of a micron or less. The metal and dielectric structure is substantially planar. The method for forming this structure involves providing a silicon body and then forming a first insulating layer on a major surface of the silicon body. A layer of polycrystalline silicon is formed thereover. Openings are made in the polycrystalline silicon layer by reactive ion etching which results in the structure having substantially horizontal surfaces and substantially vertical surfaces. A second insulating layer is then formed on both the substantially horizontal surfaces and substantially vertical surfaces. Reactive ion etching of this second insulating layer substantially removes the horizontal layers and provides a narrow dimensioned dielectric pattern of regions on the major surface of the silicon body. The remaining polycrystalline silicon layer is then removed by etching to leave the narrow dimensioned regions on the major surface of the silicon body. A conductive layer is blanket deposited over the narrow dimensioned regions and areas in between. The surface is planarized, leaving the structure of metal filling the regions between the pattern of dielectric material.
摘要:
An analog to digital converter suitable for fabrication according to integrated circuitry technology. The voltage to be converted is applied to a storage capacitor which is pulse discharged in discrete equal amounts determined by a voltage controlled constant current source. The pulses are counted and the total represents the input voltage. The current of the constant current source, and concomitantly the discrete pulsed discharge amounts, is varied during a calibrate mode depending upon any detected error. A known reference voltage is applied to the storage capacitor which is then pulsed down by the voltage controlled current source. Any deviation in the time of discharge, as compared to the known time (number of pulses) to discharge the capacitor, varies the voltage which controls the current magnitude of the constant current source.
摘要:
A new dotting circuit for integrated circuit chips which provides line switching, as well as simultaneous true and complementary outputs, while eliminating the need for the standard collector circuit voltage clamp. This circuit is implemented by the collector dotting of two or more input transistors, the collector dotting of their respective reference transistors, the emitter dotting of one input transistor and a reference transistor to a constant current source, the emitter dotting of the other input transistor and the other reference transistor to a different constant current source, and an inhibit circuit for permitting current to flow to only one of the emitter-dotted circuits in accordance with a logic control signal.
摘要:
A self-aligned metal process is decribed which achieves self-aligned metal to silicon contacts and sub-micron contact-to-contact and metal-to-metal spacing. The insulation between the contacts and the metal is a pattern of dielectric material having a thickness dimension in the order of a micron or less. The metal and dielectric structure is substantially planar. The method for forming this structure involves providing a silicon body and then forming a first insulating layer on a major surface of the silicon body. A layer of polycrystalline silicon is formed thereover. Openings are made in the polycrystalline silicon layer by reactive ion etching which results in the structure having substantially horizontal surfaces and substantially vertical surfaces. A second insulating layer is then formed on both the substantially horizontal surfaces and substantially vertical surfaces. Reactive ion etching of this second insulating layer substantially removes the horizontal layers and provides a narrow dimensioned dielectric pattern of regions on the major surface of the silicon body. The remaining polycrystalline silicon layer is then removed by etching to leave the narrow dimensioned regions on the major surface of the silicon body. A conductive layer is blanket deposited over the narrow dimensioned regions and areas in between. The surface is planarized leaving the structure of metal filling the regions between the pattern of dielectric material.
摘要:
A 3-way Exclusive OR function is performed in an essentially single stage logic delay. A 3-way OR circuit produces a logical "1" output whenever at least one of three input operands is "1". A Two And Only Two logic circuit produces a logical "0" output when two and only two of the three input operands are "1". The outputs of the OR circuit and the Two And Only Two logic circuits are DOT-ANDed to provide a desired Exclusive OR function. In one form of the invention, the Two And Only Two logic circuit comprises three Schottky diode transistor NAND circuits each having two normal inputs and one inhibit input with the inhibit input of each of the three NAND circuits being connected to receive a different one of the three input operands while the two normal inputs being connected to receive the remaining ones of the three input operands. The OR circuit comprises four transistors having their emitters coupled to a common current source. The base of one of the four transistors is connected to a reference potential while the bases of the other three transistors are connected to receive respective one of the three input operands. Outputs of the three NAND circuits and the output of the 3-way OR circuit are DOT-ANDed at an input of an emitter follower output stage.
摘要:
Circuits for sequentially addressing memory locations in time with pulses received from a clock are disclosed. The circuits may provide a positive voltage output signal at successive output nodes associated with corresponding stages in the circuit responsive to the application of a clock signal to the circuit stages. The circuit may comprise at least first and second stages wherein said first stage comprises means for providing a positive voltage signal at a first output node in the first stage in response to application of a first positive clock pulse to the first stage, and wherein said second stage comprises means for providing a positive voltage signal at a second output node in the second stage in response to application of a second positive clock pulse to the second stage. Addressing of memory locations that contain pixel information for a video display is one particular application in which sequential addressing may be required. Sequential addressing is useful in video applications because it permits sequential selection of the pixel rows and columns that make up the display screen. Sequential scanning of the memory locations for screen information can be carried out in conjunction with the scanning of an electron source across the screen of the display.
摘要:
Disclosed is a submicron wide single crystal silicon structure protruding from a monolithic silicon body. This three-dimensional structure includes lower section of a first (N) conductivity type and an upper section of a second (P) conductivity type. The upper section consisting of narrow top and bottom portions separated by a relatively wide middle portion, constitutes the silicon material from which various active or passive integrated circuit devices may be fabricated. For example, in the case of an NPN transistor, the central region of the middle portion constitutes the base region, the emitter and collector being embedded in the two outer side regions thereof in a mutually facing relationship. Electrical contacts to the elements of the IC device are established on the top and/or sides of the protruding structure. Owing to its free-standing self-isolated characteristic, dielectric isolation of the IC device is not necessary. Alternatively, total dielectric isolation of the IC may be achieved by utilizing a dielectric material for the bottom of the protrusion.
摘要:
An attenuator useful in measuring low level leakage currents is disclosed. The attenuator includes a plurality of current dividers coupled in cascade. Each current divider includes an input and two outputs between which the current entering the input is divided. The current exiting the last divider is significantly attenuated from that entering the attenuator. The attenuator output is coupled to the device under test and to one input of a differential amplifier. A known current is input to the differential amplifier and part is directed to the attenuator input and the other part to a current measuring device. The difference between the known current input to the differential amplifier and that measured is the current input to the attenuator. In the steady state, the current input to the differential amplifier from the current attenuator is about zero. Accordingly, the leakage current is equal to the known current entering the differential amplifier less the measured current divided by m, the attenuation provided by the attenuator.