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Display device and method for manufacturing the sameDisplay device and method for manufacturing the same description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090141004, Display device and method for manufacturing the same. Brief Patent Description - Full Patent Description - Patent Application Claims
1. Field of the Invention The present invention relates to a display device (hereinafter, also referred to as an input device) provided with a display portion having an input function and a method for manufacturing the input device. 2. Description of the Related Art Display panels to which text information can be input by touching a screen with a finger or a stylus pen have spread and have been used for a portable information terminal such as a PDA personal digital assistant or personal data assistance), a potable game machine, a car navigation system, and an automated teller machine (ATM), for example. As such a display panel, a display panel having a screen provided with an optical sensor is known (see Patent Documents 1 to 3). The amount of light received by an optical sensor is changed when a screen is touched with a finger or the like. Accordingly, by detecting the change, the position of the screen touched with the finger can be detected. In Patent Document 1 (Japanese Published Patent Application No. 2002-287900), a pixel functioning as a display portion and an input portion is provided with an EL element and a photoelectric conversion element. By reflecting light by the point of a pen used for input, accurate information input can be realized. In Patent Document 2 (Japanese Published Patent Application No. 2006-317682), by controlling on and off of a backlight at the time of image display and optical sensor output, detection accuracy of the optical sensor is improved. In Patent Document 3 (Japanese Published Patent Application No. 2002-33823), an optical sensor is provided in a pixel of a liquid crystal display device so that an image sensor is incorporated in a screen of the display device, whereby a personal authentication system is constructed. One of objects of the present invention is to provide an input device which is provided with a display portion including a pixel with an optical sensor and having a display function and an input function, which enables position detection by the optical sensor to be performed accurately. Another object of the present invention is to provide a method for manufacturing an input device which is provided with a display portion including a pixel with an optical sensor and having a display function and an input function, which enables position detection by the optical sensor to be performed accurately. One aspect of the present invention is an input device including a display portion including a plurality of pixels; a pixel circuit provided in each of the plurality of pixels and including a liquid crystal element and a transistor; a sensor circuit provided in all or part of the plurality of pixels and including an optical sensor and a transistor; a pixel driver circuit electrically connected to the pixel circuit; a sensor driver circuit electrically connected to the sensor circuit; and a display switching circuit electrically connected to the sensor driver circuit and the pixel driver circuit. A detection signal of the optical sensor is input to the sensor driver circuit and the sensor driver circuit outputs the detection signal to the display switching circuit. The display switching circuit outputs a signal for switching display of the display portion to the pixel driver circuit, based on the detection signal input from the sensor driver circuit. The pixel circuit, the sensor circuit, the pixel driver circuit, and the sensor driver circuit are formed over the same substrate. Semiconductor layers of the transistors in the pixel circuit and the sensor circuit and semiconductor layers of transistors in the pixel driver circuit and the sensor driver circuit are formed using a single crystal semiconductor layer. A photoelectric conversion layer of the optical sensor is formed using a single crystal semiconductor layer. The input device according to the present invention may include a backlight unit including a plurality of light-emitting diodes and illuminating the display portion. In the input device according to the present invention, instead of the liquid crystal element, a light-emitting element may be provided in the pixel circuit. Another aspect of the present invention is a method for manufacturing an input device including a display portion including a plurality of pixels; a pixel circuit provided in each of the plurality of pixels and including a liquid crystal element and a transistor; a sensor circuit provided in all or part of the plurality of pixels and including an optical sensor and a transistor; a pixel driver circuit electrically connected to the pixel circuit; and a sensor driver circuit electrically connected to the sensor circuit. In the manufacturing method of the present invention, a single crystal semiconductor substrate and a supporting substrate is prepared. A damaged region is formed in a region at a predetermined depth from a surface of the single crystal semiconductor substrate by adding an accelerated ion to the single crystal semiconductor substrate, A buffer layer is formed over at least one of the supporting substrate and the single crystal semiconductor substrate. The single crystal semiconductor substrate is fixed to the supporting substrate by disposing the supporting substrate and the single crystal semiconductor substrate in contact with each other with the buffer layer therebetween so that a surface of the buffer layer and a surface disposed in contact with the surface of the buffer layer are bonded to each other. The supporting substrate to which a single crystal semiconductor layer separated from the single crystal semiconductor substrate is fixed is formed by generating a crack in the damaged region by heating of the single crystal semiconductor substrate so that the single crystal semiconductor substrate is separated from the supporting substrate. A plurality of single crystal semiconductor layers are formed by dividing the single crystal semiconductor layer among elements. The transistors in the pixel circuit and the sensor circuit, transistors in the pixel driver circuit and the sensor driver circuit, and the optical sensor are formed using the divided single crystal semiconductor layer. In the manufacturing method of the present invention, instead of the liquid crystal element, a light-emitting element may be provided in the pixel circuit. Since a transistor and an optical sensor in an input device of the present invention are formed using a single crystal semiconductor layer, there is little variation in characteristics among pixels and among elements. Accordingly, position detection by the optical sensor can be performed accurately. Since in the method for manufacturing an input device of the present invention, a transistor and an optical sensor are formed using a single crystal semiconductor layer made of a single crystal semiconductor substrate, there is little variation in characteristics among pixels and among elements. Accordingly, the input device which is capable of accurately performing position detection by the optical sensor can be formed. Continue reading about Display device and method for manufacturing the same... Full patent description for Display device and method for manufacturing the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Display device and method for manufacturing the same patent application. Patent Applications in related categories: 20090284497 - Optical operating apparatus - An optical operating apparatus includes a display panel, a transparent supporting plate, a deformable unit, a light source, an image sensing module, a function selecting module and a processing module. The deformable unit is disposed between the transparent supporting plate and the display panel. The deformable unit has a pattern ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Display device and method for manufacturing the same or other areas of interest. ### Previous Patent Application: Display apparatus, liquid crystal display apparatus, position detection system and position detection method Next Patent Application: Optical waveguide for touch panel and touch panel using the same Industry Class: Computer graphics processing, operator interface processing, and selective visual display systems ### FreshPatents.com Support Thank you for viewing the Display device and method for manufacturing the same patent info. IP-related news and info Results in 2.49475 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , paws |
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