Abstract: It is an object of the present invention to allow a specified function to be readily selected in a mobile telephone or the like without performing a complicated operation. A liquid crystal (30) is sandwiched between a TFT substrate (10) and a color filter substrate (20). A photosensor TFT (130) for selecting the function is disposed on the periphery of an effective screen of the TFT substrate (10). A window (24) is provided in a portion of the color filter substrate corresponding to the photosensor TFT (130), and the outside light is blocked as a result of the user touching a finger to the window. A signal from the photosensor is used for selecting the function. A correction sensor TFT (133) is disposed adjacent to the photosensor TFT (130), to thereby eliminating noise caused by the temperature distribution, stray light, or the like, and erroneous operation of the photosensoris prevented.

Abstract: A touch panel includes plural first electrodes extending in a first direction, plural second electrodes extending in a second direction different from the first direction, a driving circuit, a detection circuit, and a coordinate-position calculating circuit.

Abstract: Provided is a display device with a touch panel having the cost thereof reduced without a decrease in the transmittance ratio of light. A substrate has a planar transparent conductive film formed on an observer side thereof. The transparent conductive film is used as a transparent electrode of an electrostatic capacitance coupling type touch panel. A position detection pulsating voltage production circuit that inputs a pulsating voltage for position detection, and a coordinate position arithmetic circuit that computes a touched position on the transparent conductive film touched with an observer's finger are included. The transparent conductive film is shaped to have four corners. The position detection pulsating voltage generation circuit applies the position detection pulsating voltage to each of the four corners of the transparent conductive film at different timings.

Abstract: The present invention provides a display device having an illuminance detection circuit. The illuminance detection circuit includes: a photosensor which changes an optical current in response to illuminance of an external light; a capacitor which discharges a charge when the optical current flows in the photosensor; a comparator which compares a voltage at one end of the capacitor and a comparison reference voltage; a switching circuit which is connected to one end of the capacitor and charges the capacitor in response to a level of an output signal of the comparator; and a selection circuit which applies either a first voltage or a second voltage to the other end of the capacitor in response to the level of the output signal of the comparator.

Abstract: In a display device with a touch panel which includes a display panel and a touch panel which is arranged to face the display panel in an opposed manner, the touch panel includes a transparent substrate, a plurality of first electrodes which is formed on a surface of the transparent substrate on a side facing the display panel, and a plurality of second electrodes which intersects with the plurality of first electrodes and is formed on the surface of the transparent substrate on the side facing the display panel, the display panel forms a planar third electrode which faces the plurality of first electrodes and the plurality of second electrodes on a surface thereof on a side facing the touch panel, and a distance between the plurality of first electrodes and the third electrode and a distance between the plurality of second electrodes and the third electrode are respectively set to 0.5 mm or less.

Abstract: A present display device with a highly reliable capacitive touch panel includes: a display panel; and a capacitive touch panel which is placed on an observer side of the display panel, in which the touch panel includes a first substrate and a second substrate which are arranged to face each other, in which the first substrate includes on a surface thereof, which is opposed to the second substrate: a plurality of first electrodes which extend in a first direction side by side; and a plurality of second electrodes which extend in the second direction to intersect the plurality of first electrodes side by side, in which the second substrate includes on a surface thereof, which is opposed to the first substrate a planar third electrode, and the display device includes a gel-like sheet interposed between the plurality of first electrodes and the plurality of second electrodes, and the third electrode.

Abstract: A present display device with a touch panel includes: four detection circuits each of which is provided in one of the four corners of the transparent conductive film; and a coordinate position arithmetic circuit to which voltages detected by the four detection circuits are input. The detection circuits each include: a detection switch which supplies the position detection voltage to the corner of the transparent conductive film; and an integration circuit which integrates a current that flows in the corner of the transparent conductive film where its own detection circuit is provided after the detection switch is switched off. Based on voltages integrated by the four integration circuits, the coordinate position arithmetic circuit calculates which point on the transparent conductive film has been touched with one of a finger of an observer and a pen held by the observer.

Abstract: A touch panel includes plural first electrodes extending in a first direction, plural second electrodes extending in a second direction different from the first direction, a driving circuit, a detection circuit, and a coordinate-position calculating circuit.

Abstract: Provided is a display device with a touch panel having the cost thereof reduced without a decrease in the transmittance ratio of light. A substrate has a planar transparent conductive film formed on an observer side thereof. The transparent conductive film is used as a transparent electrode of an electrostatic capacitance coupling type touch panel. A position detection pulsating voltage production circuit that inputs a pulsating voltage for position detection, and a coordinate position arithmetic circuit that computes a touched position on the transparent conductive film touched with an observer's finger are included. The transparent conductive film is shaped to have four corners. The position detection pulsating voltage generation circuit applies the position detection pulsating voltage to each of the four corners of the transparent conductive film at different timings.

Abstract: It is an object of the present invention to allow a specified function to be readily selected in a mobile telephone or the like without performing a complicated operation. A liquid crystal (30) is sandwiched between a TFT substrate (10) and a color filter substrate (20). A photosensor TFT (130) for selecting the function is disposed on the periphery of an effective screen of the TFT substrate (10). A window (24) is provided in a portion of the color filter substrate corresponding to the photosensor TFT (130), and the outside light is blocked as a result of the user touching a finger to the window. A signal from the photosensor is used for selecting the function. A correction sensor TFT (133) is disposed adjacent to the photosensor TFT (130), to thereby eliminating noise caused by the temperature distribution, stray light, or the like, and erroneous operation of the photosensor is prevented.

Abstract: The present invention provides a display device having an illuminance detection circuit. The illuminance detection circuit includes: a photosensor which changes an optical current in response to illuminance of an external light; a capacitor which discharges a charge when the optical current flows in the photosensor; a comparator which compares a voltage at one end of the capacitor and a comparison reference voltage; a switching circuit which is connected to one end of the capacitor and charges the capacitor in response to a level of an output signal of the comparator; and a selection circuit which applies either a first voltage or a second voltage to the other end of the capacitor in response to the level of the output signal of the comparator.

Abstract: A photosensor for selecting a specific function is arranged around an effective screen. A window is formed in a portion of a display substrate corresponding to the photosensor. When a user touches the window with his/her finger, an external light is interrupted and a signal is generated, and the signal is used as a signal for selecting the specific function. The photosensor and peripheral circuits are formed using a process substantially equal to, a process for forming a TFT of a pixel portion and hence, the increase of a cost can be suppressed.

Abstract: To provide a field-sequential liquid crystal display device capable of reducing color shading.