Abstract: An organic EL drive circuit and an organic EL display device is capable of preventing sticking of a display screen of the organic EL panel due to reduction of an output current of a relatively high withstand voltage transistor of a D/A converter circuit. In particular, an analog converted current is obtained at a predetermined output terminal of a D/A converter by connecting a plurality of series-connected relatively high withstand voltage transistors between an output side of the D/A converter constructed with a current mirror circuit and an output terminal of the D/A converter and using low withstand voltage transistors as output side transistors of the D/A converter. Therefore, the output side transistors of the D/A converter can be replaced by low withstand voltage transistors similar to the input side transistors, so that the area occupied by the D/A converter can be reduced.

Abstract: To provide an organic EL drive circuit including D/A converter circuits capable of reducing the number of elements, which are proof against relatively high voltage, restricting an increase of circuit size and restricting variation of luminance of a display screen and an organic EL display device using the organic EL drive circuit.

Abstract: To provide an organic EL drive circuit capable of reducing luminance variation or luminance unevenness of a display device while restricting an increase of circuit side even when reference currents are not uniform or the current conversion accuracy of D/A converters for converting display data according to the reference currents is some what low and an organic EL display device using the same organic EL drive circuit. A selection circuit for selecting a predetermined current (reference current or reference drive current) is provided between each of current generator circuits and each of current sources provided correspondingly to output terminals of driver to select one of a predetermined current of the current generator circuit corresponding to the output terminal assigned thereto and a predetermined current from a current generator circuit adjacent to the current generator circuit correspondingly to a row side scanning.

Abstract: A semiconductor apparatus has a configuration in which multiple copper wiring layers and multiple insulating layers are alternately layered. A low-impedance wiring is formed occupying a predetermined region. A first wiring pattern includes multiple copper wiring members arranged in parallel with predetermined intervals in a first copper wiring layer, each of which has a rectangular shape extending in a first direction. A second wiring pattern includes multiple copper wiring members arranged in parallel with predetermined intervals in a second copper wiring layer adjacent to the first copper wiring layer, each of which has a rectangular shape extending in a second direction orthogonal to the first direction. The region occupied by the first wiring pattern and that occupied by the second wiring pattern are arranged such that they at least overlap. The first wiring pattern and the second wiring pattern are electrically connected so as to have the same electric potential.

Abstract: A current mirror type D/A converter circuit is constructed with transistor cells each including a MOS transistor, a gate region of which MOS transistor has folded stripe configuration in a plan view thereof, or a current flowing direction in a channel of which is a folded stripe in plan view.

Abstract: A D/A converter circuit includes a first current mirror circuit and a second current mirror circuit. The first current mirror circuit has a plurality of output side transistors provided correspondingly to digits of data to be converted and generates en analog current by obtaining, in at least one of the output side transistors, a current corresponding to the weight of the digit of the data being converted. The second current mirror circuit is connected on an upstream or downstream side of the output side transistors and corresponding to a lower digit of the data. An analog current is generated with the second current mirror circuit by obtaining a current corresponding to a weight of a digit that is less than 1.

Abstract: The output current from respective output terminals of a drive circuit (driver IC) of an organic EL display panel to respective column pins or data lines is sequentially selected by sequentially scanning a plurality of switch circuits by a switch scan circuit. The resultant output currents are converted into voltage values by resistors selected by a selector. Further, the converted voltage values sequentially generated according to the scanning of the switch scan circuit are outputted externally of the IC.

Abstract: A transistor for detecting current generated by an output side transistor of a current mirror circuit of an organic EL panel drive circuit and a control circuit including a current driven input stage and an output stage for driving the input side transistor of the current mirror circuit are provided. The input stage of the control circuit receives the detected current and a certain reference current and the output stage of the control circuit generates a drive current, which corresponds to a difference between the detected current and the certain reference current and drives the input side transistor of the current mirror circuit. The control circuit controls the detected current in such a manner that it becomes equal to the reference current and the current distributed to terminal pins of an organic EL panel becomes the reference current or a current corresponding thereto.

Abstract: A driver IC (4) and a current driver circuit (40) are shared by a first organic EL panel (2) and a second organic EL panel (3). Therefore, not like conventional cases, the current driving circuit (40) on a side not selected is not necessarily in a standby state, and power consumption can be reduced. In a case where the first and second organic EL panels are passive matrix type, a first diode is provided between each column line of the first and the second organic EL panels and corresponding each terminal pin so as to prevent a reverse flow.

Abstract: An organic EL drive circuit and an organic EL display device is capable of preventing sticking of a display screen of the organic EL panel due to reduction of an output current of a relatively high withstand voltage transistor of a D/A converter circuit. In particular, an analog converted current is obtained at a predetermined output terminal of a D/A converter by connecting a plurality of series-connected relatively high withstand voltage transistors between an output side of the D/A converter constructed with a current mirror circuit and an output terminal of the D/A converter and using low withstand voltage transistors as output side transistors of the D/A converter. Therefore, the output side transistors of the D/A converter can be replaced by low withstand voltage transistors similar to the input side transistors, so that the area occupied by the D/A converter can be reduced.

Abstract: An organic EL drive circuit comprises a timing signal generator circuit for generating a plurality of second timing control signals sequentially delayed from a first timing control signal, a reset pulse generator circuit for selecting one of the plurality of the second timing control signals according to the predetermined data and generating a reset pulse having a front edge determined according to the selected second timing control signal and a rear edge determined by the first timing control signal and a switch circuit responsive to the reset pulse for connecting the terminal pins to a predetermined bias line to reset an organic EL element of an organic EL panel connected to the terminal pins. Luminance of the organic EL panel is regulated by regulating the display period according to the predetermined data.

Abstract: [Problem]To provide an organic EL drive circuit capable of reducing luminance variation or luminance unevenness of a display device while restricting an increase of circuit side even when reference currents are not uniform or the current conversion accuracy of D/A converters for converting display data according to the reference currents is some what low and an organic EL display device using the same organic EL drive circuit. [Means for Solving the Problem]A selection circuit for selecting a predetermined current (reference current or reference drive current) is provided between each of current generator circuits and each of current sources provided correspondingly to output terminals of driver to select one of a predetermined current of the current generator circuit corresponding to the output terminal assigned thereto and a predetermined current from a current generator circuit adjacent to the current generator circuit correspondingly to a row side scanning.

Abstract: [Problem] To provide a high precision D/A converter circuit capable of being driven with low voltage and restricting an area taken thereby when it is formed as an IC.

Abstract: An organic EL display device has a high resolution in which an organic EL panel current is driven by a plurality of current drive ICs (current drivers). The occupation area required for the current drive circuits is suppressed and unevenness in luminance of the display screen is reduced. The EL panel has first and second current drivers which output drive currents corresponding to display data to terminal pins via output terminals to drive the organic EL panel, which are respectively provided with a plurality of output terminals and a plurality of connection switch circuits. The connection switch circuits are provided inside the organic EL panel and n (n?1) pieces of respective output terminals for the first and second driver are alternatively switched and connected to n pieces of respective column lines (drive lines at the anode side of an organic EL element).

Abstract: [Problem]To provide an organic EL display device, which can prevent erroneous light emission of an active matrix type display panel and reduce power consumption during the display panel switching and is effective in reducing area and thickness of the organic EL display device. [Means for Resolution]An organic EL display device having a first organic EL panel of active matrix type and a second organic EL panel includes current drive circuits having output pins commonly used by the first and second organic EL panels and switch circuits for cutting drive currents of the first organic EL panel off are provided in the first organic EL panel. According to another aspect of the present invention, the organic EL display device includes a reset circuit constructed with a D/A converter circuit and a plurality of analog switches connected to the output pins.

Abstract: [Problem]To provide an organic EL drive circuit including D/A converter circuits capable of reducing the number of elements, which are proof against relatively high voltage, restricting an increase of circuit size and restricting variation of luminance of a display screen and an organic EL display device using the organic EL drive circuit.

Abstract: [Problem]To provide an organic EL display device which is suitable to minimize a size thereof and is capable of preventing erroneous light emission and reducing power consumption when a display is switched from one of a first and second organic EL display panels to the other. To provide an organic EL display device capable of preventing erroneous light emission with which display luminance in black level is pushed up to that in gray level. [Means for Solving the Problem]In the first invention, the current drive circuit having output pins common for the first and second organic EL panels is provided. Therefore, there is no need of providing current drive circuits for the respective first and second organic EL panels. Consequently, it is unnecessary to make the organic EL panel, which is not selected, standby state, so that it is possible to reduce power consumption correspondingly.

Abstract: [Problem]To provide a drive circuit (driver IC) of an organic EL display panel and an organic EL display device, which is capable of shortening a test time when a test on appropriateness of current values outputted to respective column pins of the drive circuit. [Means for Solving the Problem]Output currents outputted from respective output terminals of a drive circuit (driver IC) of an organic EL display panel to respective column pins or data lines are sequentially selected by sequentially scanning a plurality of switch circuits by a switch scan circuit, the output currents are converted into voltage values by resistors selected by a selector and the converted voltage values sequentially generated according to the scanning of the switch scan circuit are outputted externally of the IC.

Abstract: [Problem]To provide an organic EL drive circuit and an organic EL display device, capable of restricting an area taken by gamma correction circuits provided correspondingly to terminal pins. [Means for Solving the Problem]An organic EL drive circuit includes switch circuits for connecting the terminal pins to a predetermined potential line according to a reset pulse, a correction data generator circuit for generating correction data for correcting a light emitting period of the organic EL element according to display data for gamma correction of luminance of the organic EL element and a reset pulse generator circuit for generating the reset pulse having pulse width corresponding to the gamma correction according to the first timing control signal and the correction data.

Abstract: An organic EL element drive circuit comprises a plurality of peak current generator circuits provided correspondingly to terminal pins of an organic EL display panel, for adding peak currents corresponding to pulse widths of predetermined pulse signals and a pulse generator circuit for generating the predetermined pulse signal including a first, second and third pulses having pulse widths thereof determined according to data, which are set externally of the pulse generator circuit. The pulse generator circuit sends the first pulse to the terminal pins of the peak current generator circuits provided for R display color as the predetermined pulse, the second pulse to the peak current generator circuits provided for G display color as the predetermined pulse and the third pulse to the peak current generator circuits provided for B display color as the predetermined pulse.