| Patent application number | Description | Published |
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| 20090257283 | METHOD FOR DELETING DATA FROM NAND TYPE NONVOLATILE MEMORY - To provide a method of releasing charges which have been injected into charge accumulating layers of nonvolatile memory elements without using a substrate terminal such as a p well or an n well, as a method for deleting data from a NAND-type nonvolatile memory. In the method for deleting data from the NAND-type nonvolatile memory, charges stored in a charge accumulating layer of a first nonvolatile memory element are released by applying a first potential to a bit line and a source line, a second potential to a control gate of the first nonvolatile memory element, and a third potential which is different from the second potential to a control gate of a second nonvolatile memory element. | 10-15-2009 |
| 20100133601 | SEMICONDUCTOR DEVICE - A semiconductor device is provided, which comprises at least a cell including a plurality of memory elements connected in series. Each of the plurality of memory elements includes a channel formation region, a source and drain regions, a floating gate, and a control gate. Each of the source and drain regions is electrically connected to an erasing line through a semiconductor impurity region. | 06-03-2010 |
| 20100277985 | Verification Method for Nonvolatile Semiconductor Memory Device - The present invention provides nonvolatile semiconductor memory devices which operate with low power consumption. In a nonvolatile semiconductor memory device, a plurality of nonvolatile memory elements are connected in series. The plurality of nonvolatile memory elements include a semiconductor layer including a channel forming region and a control gate provided to overlap with the channel forming region. Operations of write, erase, a first read, and a second read in a verify operation of data to the nonvolatile memory elements, are conducted by changing voltage to the control gates of the nonvolatile memory elements. The second read in the verify operation after erase operation is conducted by changing only one of a potential of the control gate of a nonvolatile memory element which are selected from the plurality of nonvolatile memory elements, and as the potential, a potential different from a potential of the first read is used. | 11-04-2010 |
| 20110204424 | SEMICONDUCTOR DEVICE - An object is to provide a semiconductor device in which damages of an element such as a transistor are reduced even when physical force such as bending is externally applied to generate stress in the semiconductor device. A semiconductor device includes a semiconductor film including a channel formation region and an impurity region, which is provided over a substrate, a first conductive film provided over the channel formation region with a gate insulating film interposed therebetween, a first interlayer insulating film provided to cover the first conductive film, a second conductive film provided over the first interlayer insulating film so as to overlap with at least part of the impurity region, a second interlayer insulating film provided over the second conductive film, and a third conductive film provided over the second interlayer insulating film so as to be electrically connected to the impurity region through an opening. | 08-25-2011 |
| 20110220983 | METHOD FOR DELETING DATA FROM NAND TYPE NONVOLATILE MEMORY - To provide a method of releasing charges which have been injected into charge accumulating layers of nonvolatile memory elements without using a substrate terminal such as a p well or an n well, as a method for deleting data from a NAND-type nonvolatile memory. In the method for deleting data from the NAND-type nonvolatile memory, charges stored in a charge accumulating layer of a first nonvolatile memory element are released by applying a first potential to a bit line and a source line, a second potential to a control gate of the first nonvolatile memory element, and a third potential which is different from the second potential to a control gate of a second nonvolatile memory element. | 09-15-2011 |
| 20120133839 | SOURCE LINE DRIVING CIRCUIT, ACTIVE MATRIX TYPE DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME - If the frequency of a clock signal is increased, the pulse width of a sampling pulse is decreased, and the amount of time for a video signal to be written to a source line is inadequate. Sampling pulses (sam) rise sequentially in synchronization with the rise of a start pulse (SP). As the start pulse (SP) rises, synchronized with the rise of clock signals (CK, CKB), the sampling pulses (sam) fall off sequentially, delayed by half the period of the clock signals (CK, CKB) for every step. As a result, the sampling pulses (sam) with a pulse width longer than one period of the clock signals (CK, CKB) are generated. In a period T | 05-31-2012 |
| Patent application number | Description | Published |
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| 20080216151 | Electronic data authenticity assurance method and program - The present invention provides an electronic document authenticity assuring method in which a series of procedures concerning redactable signature are divided into procedures dependent on a document to be signed and procedures dependent on a redactable signature method. Further, the present invention provides program codes that realize the divided procedures and a system comprising apparatuses for implementing those program codes. According to the present invention, even when type of electronic document to be signed is changed or added to, it is sufficient to add a procedure dependent on a document to be signed, without changing procedures dependent on redactable signature methods. Similarly, even when a redactable signature method is to be changed or added, it is sufficient to add a procedure dependent on the redactable signature method without changing procedures dependent on document to be signed. | 09-04-2008 |
| 20080294903 | AUTHENTICITY ASSURANCE SYSTEM FOR SPREADSHEET DATA - A method is provided for applying a redactable signature method capable of verification even after deletion (blacking-out) of a part of a signed electronic document to spreadsheet data. | 11-27-2008 |
| 20090116643 | ENCRYPTION APPARATUS, DECRYPTION APPARATUS, AND CRYPTOGRAPHY SYSTEM - Provided is a technology with which an electronic document including a plurality of elements such as texts and images may be partially encrypt and decrypt. An encryption-processing control unit receives a selection of electronic data included in an electronic document and a selection of an encryption key for encrypting the electronic data from among encryption keys stored in a storing unit. The encryption-processing control unit generates encrypted area data including partially encrypted data obtained by encrypting the selected electronic data with the selected encryption key, positional information for specifying a position of the selected electronic data in the electronic document, and decryption information including information that may specify a decryption key with which the partially encrypted data may be decrypted, and adds the encrypted area data to the electronic document. | 05-07-2009 |
| 20090193259 | ELECTRONIC DOCUMENT AUTHENTICITY ASSURANCE METHOD AND ELECTRONIC DOCUMENT DISCLOSURE SYSTEM - An electronic document authenticity assurance technique and an information disclosure system both of which can compatibly realize the assurance of the authenticity of disclosure documents and the deletion of information inappropriate for disclosure. An electronic document is divided into constituent elements and an electronic signature is affixed to an arbitrary subset of a set including all the constituent elements. Otherwise, an electronic signature is affixed to data obtained by binding each of the constituent elements to information specifying the relationship between a respective one of the constituent elements and the structure of the electronic document. Otherwise, the hash values of the respective constituent elements are calculated and an electronic signature is affixed to data obtained by binding the calculated hash values together. Otherwise, random numbers generated for the respective constituent elements are bound together, then the hash values of the respective random-numbered constituent elements are calculated, and then an electronic signature is affixed to data obtained by binding the calculated hash values together. | 07-30-2009 |
| 20100046749 | CONTENT PROTECTION APPARATUS, AND CONTENT UTILIZATION APPARATUS - Content is divided into a plurality of partial contents. Next, each of the partial contents is encrypted using a browsing-control-use secret key. Also, an editing-control-use secret key and a partial-content validation key are generated, then generating the feature value for each of the partial content. Moreover, key-encrypted data is generated by encrypting the browsing-control-use secret key and the editing-control-use secret key corresponding to each of the browsable and editable partial contents, using the public key of a user. Finally, encrypted content is generated from the key-encrypted data, encrypted partial contents, and the partial-content validation key. | 02-25-2010 |
