Abstract: The navigation device includes a detour exploring portion configured to explore a detour to avoid a section in which a traffic hazard occurs using map data at a level lower than a predetermined level when a traffic hazard determining portion determines that the traffic hazard occurs on the guidance route, and a display control portion configured to zoom the detour to match a scale of the detour to a currently designated scale, and synthesize and display the detour on a map image. The navigation device maintains the display of the wide area map and synthesizes and additionally displays a detour, for example, to pass through a road such as a narrow street included in a detailed map on the map image such that the user can receive, at a glance, a detour to easily bypass the section in which a traffic hazard occurs.

Abstract: The navigation device includes a detour exploring portion configured to explore a detour to avoid a section in which a traffic hazard occurs using map data at a level lower than a predetermined level when a traffic hazard determining portion determines that the traffic hazard occurs on the guidance route, and a display control portion configured to zoom the detour to match a scale of the detour to a currently designated scale, and synthesize and display the detour on a map image. The navigation device maintains the display of the wide area map and synthesizes and additionally displays a detour, for example, to pass through a road such as a narrow street included in a detailed map on the map image such that the user can receive, at a glance, a detour to easily bypass the section in which a traffic hazard occurs.

Abstract: The present invention provides a liquid crystal display device having an LED drive circuit which can control a dimming control signal even with a pulse width of several tens ?sec or less. The LED drive circuit includes a booster circuit, a first stage current mirror circuit generating a reference current, a second stage current mirror circuit generating a driving current from the reference current, a light-emitting diode column having a light-emitting diode supplied with the driving current, and a dimming control circuit controlling the turning on and off of the light-emitting diode based on a dimming control signal.

Abstract: In a display device, profile emphasizing is performed without using a frame memory while realizing the further reduction of power consumption. A display device includes a display panel provided with a plurality of pixels each of which has a pixel electrode, and a drive circuit which supplies a video signal to the respective pixels through video lines. Here, the drive circuit includes a profile emphasizing circuit which generates profile emphasizing display data which emphasizes a profile in response to display data inputted from the outside and emphasizes a profile portion of an image to be displayed on the display panel, and a memory which stores the profile emphasizing display data. The profile emphasizing circuit includes a latch circuit which sequentially stores continuous k (k?2) pieces of display data in display data for 1 display line and an arithmetic circuit which generates the profile emphasizing display data based on the k pieces of display data stored in the latch circuit.

Abstract: The present invention provides a liquid crystal display device having an LED drive circuit which can control a dimming control signal even with a pulse width of several tens ?sec or less. The LED drive circuit includes a booster circuit, a first stage current mirror circuit generating a reference current, a second stage current mirror circuit generating a driving current from the reference current, a light-emitting diode column having a light-emitting diode supplied with the driving current, and a dimming control circuit controlling the turning on and off of the light-emitting diode based on a dimming control signal.

Abstract: In a display device, profile emphasizing is performed without using a frame memory while realizing the further reduction of power consumption. A display device includes a display panel provided with a plurality of pixels each of which has a pixel electrode, and a drive circuit which supplies a video signal to the respective pixels through video lines. Here, the drive circuit includes a profile emphasizing circuit which generates profile emphasizing display data which emphasizes a profile in response to display data inputted from the outside and emphasizes a profile portion of an image to be displayed on the display panel, and a memory which stores the profile emphasizing display data. The profile emphasizing circuit includes a latch circuit which sequentially stores continuous k(k?2) pieces of display data in display data for 1 display line and an arithmetic circuit which generates the profile emphasizing display data based on the k pieces of display data stored in the latch circuit.

Abstract: The number of current sources and switches necessary for a plurality of unit D/A converters using equal reference currents, are drastically reduced to reduce the parasitic capacitance coupled to current output lines, by converting a plurality of digital signals of a predetermined bit, which are divided from an input digital signal, into an analog current unit D/A converters and by converting the analog current in a manner to correspond to the weights of the corresponding input digital signals, thereby to synthesize the currents. The fixed reference digital signal is inputted to the D/A converter for cancelling offsets. The offsets of a plurality of analog output signals in positive and opposite phases obtained by branching the output of the D/A converter are individually detected. After this, the DC offset values of the individual analog outputs are used as offset adjusted negative feedback signals for a desired value.

Abstract: An over-sampling analog-to-digital converter using a current switching circuit 102 as a local digital-to-analog converter, wherein a difference between the output currents Isig and Iq of a voltage-to-current converter circuit 101 and a current switching circuit is integrated by a capacitor 105 of which the one end is grounded to a dc potential VB. Further, the current switching circuit 102 has many bits to decrease the difference current between the signal current Isig and the feedback current signal Iq. Moreover, the level-shifting function of the voltage-to-current converter circuit 101 makes it possible to apparently subtract the dc component from the input analog signal Vsig which is produced based on an internally generated dc voltage as a dc bias voltage, and to decrease a change in the voltage between the electrodes of a capacitor caused by the integration of current.