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 D/A converter of the current switching type has a first current mirror circuit that D/A converts the upper (n?m) digits in n bit data to be converted and a weighting current circuit block or a second current mirror circuit that D/A converts the lower m digits in the data, by cascade connecting the weighting current circuit block or the second current mirror circuit at the upstream or at the downstream side of an output side transistor other than the output side transistors of the first current mirror circuit. In this manner, current flowing through the output side transistor flows as diverting currents to the weighting current circuit block or the second current mirror circuit corresponding to the digit weights of the lower m digits, and the diverting currents are taken out at the outputs of the D/A conversion circuit as analog converted currents of the lower m digits.

Abstract: A cooling system includes a first cooling system in which coolant is supplied from a radiator to a motor so as to cool the motor, and then the coolant is supplied to banks of an engine through a circulation passage and split flow passages so as to cool the engine; and a second cooling system in which the coolant delivered from the radiator through a branch passage is further cooled by a radiator, and the cooled coolant is supplied to a drive circuit so as to cool the drive circuit. With this configuration, it is possible to efficiently cool the motor, the engine, and the drive circuit whose suitable operating temperatures are different from each other, and to make the configuration of the cooling system simple.

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: An organic EL display device having an organic EL drive circuit has a reference current generation circuit that switches the column line drive in response to changing of the dot arrangement of R, G and B through changeover switch circuits. Three D/A converter blocks constituted by a plurality of switch circuits and a plurality of output side transistors of a current mirror circuit are provided to produce reference currents for R, G and B that are selectively switched by a first, a second and a third changeover switch circuit. As a result, the D/A converter blocks corresponding to the respective terminal pins dynamically produce drive currents for the respective terminal pins so as to correspond to the dot arrangement of R, G and B on the organic EL panel.

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 display comprises an element substrate, an organic EL element formed on the element substrate, comprising an organic layer including a light emitting layer and a pair of electrode layers disposed on both sides of the organic layer. The organic layer comprises a first organic material. The organic EL display further comprises a capping layer comprising a second organic material having a glass transition point lower than one of the first organic material and a protective layer on the capping layer.

Abstract: A first current mirror circuit including an input side transistor, an output transistor and passive elements respectively connected in series with said input side transistor and said output side transistor, temperature coefficients of said passive elements being opposite in characteristics and a second current mirror circuit provided as a load circuit of the first current mirror circuit, for feeding back an output current of the output side transistor to an input of the input side transistor are provided. A drive current is generated on a basis of a current corresponding to a current generated in the output side transistor as a reference current and an operating current ratio of the input side transistor and the output side transistor is selected such that luminance change of organic EL elements with respect to temperature change is restricted.

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: An image display apparatus includes a plurality of pixels. Each of the pixels includes a light emitting element, a first thin film transistor, and a capacitor. The light emitting element has a light emitting region. The first thin film transistor is arranged outside the light emitting region in plan view. The capacitor is arranged inside the light emitting region in plan view.

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 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 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: Reference number 21 indicates a CPU, reference number 22 indicates a memory controller, and reference number 23 indicates a parameter set register group that has access parameters shared and used by banks. In the parameter set register group 23, parameter sets S0 to Sn having elements P0 to Pn exist. Reference number 24 indicates an external memory group to be finally accessed. A parameter set selection register 27 selects a parameter set among the parameter sets S0 to Sn of the parameter set register group 23 so as to be corresponded to each bank. The parameter set selection register 27 stores a unique identifier for each of banks B0 to Bm, which select the parameter sets S0 to Sn.