Display device with touch detection function and electronic apparatus

#The present disclosure relates to a display device and an electronic apparatus that can detect an external proximity object, and more particularly relates to a display device with a touch detection function and an electronic apparatus that can detect an external proximity object based on a change in capacitance.

#In recent years, a touch detection device that can detect an external proximity object, a so-called “touch panel”, is drawing attention. The touch panel is used for the display device with a touch detection function in which a touch detection device is mounted on or integrated with a display device such as a liquid-crystal display device. The display device with a touch detection function displays various button images or the like on the display device, and thereby allows information to be input by the touch panel instead of a general mechanical button. The display device with a touch detection function having such a touch panel does not require an input device such as a keyboard, a mouse, or a keypad. Accordingly, the usage thereof is increasing in portable information devices such as mobile phone as well as computers.

#As a method of touch detection, various methods such as an optical method, a resistive method, and a capacitive method can be mentioned. A capacitive type touch detection device has a relatively simple structure and can realize low power consumption. Accordingly, the capacitive type touch detection device can be that can be used for a mobile device. For example, Japanese Patent Application Laid-open Publication No. 2011-138154 describes a touch panel in which a transparent electrode pattern is made invisible. Japanese Patent Application Laid-open Publication No. 2007-264393 relates to a liquid crystal display device having a light-transmissive light condensing sheet, and describes a technique for suppressing a contrasting pattern (Moire) due to interference between a prism array pitch of the light condensing sheet and a pixel pitch of a liquid-crystal display panel.

#FIG. 1 is a block diagram illustrating a configuration example of a display device with a touch detection function according to a first embodiment;

#FIG. 2 is an explanatory diagram illustrating a state where a finger is not in contact with or in proximity to the display device, for explaining a basic principle of a capacitive type touch detection method;

#FIG. 3 is an explanatory diagram illustrating an example of an equivalent circuit in the state where a finger is not in contact with or in proximity to the display device as illustrated in FIG. 2;

#Embodiments for carrying out the present disclosure will be explained in detail with reference to the accompanying drawings. The present disclosure is not limited to the contents described in the following embodiments. Constituent elements described in the following explanations include those that can be easily conceived by persons skilled in the art and that are substantially identical. In addition, constituent elements described in the following explanations can be combined as appropriate. Explanations are made with the following order.

#1. Embodiments (Display Device with Touch Detection Function)

#1-1. First embodiment