Abstract: A novel light-emitting device is provided. A light-emitting device with high emission efficiency is provided. A light-emitting device with a long lifetime is provided. A light-emitting device with low driving voltage is provided. The light-emitting device includes an anode, a cathode, and an EL layer between the anode and the cathode. The EL layer includes a hole-injection layer, a light-emitting layer, and an electron-transport layer. The hole-injection layer is positioned between the anode and the light-emitting layer. The electron-transport layer is positioned between the light-emitting layer and the cathode. The hole-injection layer contains a first substance and a second substance. The first substance is an organic compound which has a hole-transport property and a HOMO level higher than or equal to ?5.7 eV and lower than or equal to ?5.4 eV. The second substance exhibits an electron-accepting property with respect to the first substance.

Abstract: A comparator includes a first circuit including first, second, and third transistors, and a second circuit. One of the first transistor and the second transistor in the first circuit is an input transistor to which an input analog voltage is applied. The third transistor is configured to short-circuit a drain and a source of each of the first transistor and the second transistor during a period when the input analog voltage is applied.

Abstract: A comparator includes a first circuit including first, second, and third transistors, and a second circuit. One of the first transistor and the second transistor in the first circuit is an input transistor to which an input analog voltage is applied. The third transistor is configured to short-circuit a drain and a source of each of the first transistor and the second transistor during a period when the input analog voltage is applied.

Abstract: A method for providing a background image on a display of a mobile telephone, whereby the data of one or more background images are stored in at least one memory accessible for the mobile telephone, comprises an automatic selection of a background image to be displayed, a retrieving of the data of the automatically selected background image from the memory, and a displaying of the retrieved background image on the display of the mobile telephone.

Abstract: A method for providing a background image on a display of a mobile telephone, whereby the data of one or more background images are stored in at least one memory accessible for the mobile telephone, comprises an automatic selection of a background image to be displayed, a retrieving of the data of the automatically selected background image from the memory, and a displaying of the retrieved background image on the display of the mobile telephone.

Abstract: A method for providing a background image on a display of a mobile telephone, whereby the data of one or more background images are stored in at least one memory accessible for the mobile telephone, comprises an automatic selection of a background image to be displayed, a retrieving of the data of the automatically selected background image from the memory, and a displaying of the retrieved background image on the display of the mobile telephone.

Abstract: A method for providing a background image on a display of a mobile telephone, whereby the data of one or more background images are stored in at least one memory accessible for the mobile telephone, comprises an automatic selection of a background image to be displayed, a retrieving of the data of the automatically selected background image from the memory, and a displaying of the retrieved background image on the display of the mobile telephone.

Abstract: A method for providing a background image on a display of a mobile telephone, whereby the data of one or more background images are stored in at least one memory accessible for the mobile telephone, comprises an automatic selection of a background image to be displayed, a retrieving of the data of the automatically selected background image from the memory, and a displaying of the retrieved background image on the display of the mobile telephone.

Abstract: A method for providing a background image on a display of a mobile telephone, whereby the data of one or more background images are stored in at least one memory accessible for the mobile telephone, comprises an automatic selection of a background image to be displayed, a retrieving of the data of the automatically selected background image from the memory, and a displaying of the retrieved background image on the display of the mobile telephone.

Abstract: An extrusion foamed article with a large cross-sectional area is made by extrusion foaming a mixture of an ionomer resin and a styrenic resin utilizing a volatile blowing agent. The process permits economic production of a novel thick, foamed article having well balanced properties.