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    • 4. 发明授权
    • Past dependent microcomputer cipher apparatus
    • 过去的依赖微机加密装置
    • US4249180A
    • 1981-02-03
    • US943765
    • 1978-09-20
    • Gernot EberleAnthony R. WalkerWilliam GoodchildPatrice L. D. Humbert-Droz
    • Gernot EberleAnthony R. WalkerWilliam GoodchildPatrice L. D. Humbert-Droz
    • H04L9/00H04L9/02
    • H04L9/0656H04L9/12H04L9/36H04L2209/04
    • Apparatus for use in a secure data communication system includes a microcomputer that controls a cipher process by which sensitive data is encrypted before transmission. When activated, the apparatus accepts either cleartext or ciphertext and transforms the text to its opposite form according to an algorithm that is past dependent and which is also dependent on a pseudo random cipher key. Ciphertext may then be stored in an information retrieval system or transmitted to a destination terminal where the text is deciphered in real time by a corresponding second apparatus that stores the same key. In either case, security of transmitted and stored data is maintained since the sensitive data is in encrypted form. A set of logical instructions according to the algorithm is stored in a read only memory of the microcomputer which includes an EPROM unit having a data field of predetermined characters. The cipher process is initiated by a control character and starts with predetermined seeds that establish a first origin in the data field for each line of text to be encrypted. This origin is then translated to a second origin of the data field in response to four characters that are randomly generated by a counter. A variable sequence of iterative logical operations transforms cleartext to ciphertext and provides a key stream that is non-linear, random-like and which possesses an encryption period that is substantially longer than the period of any line so that the periodicity of the key stream is never indicated. The cipher keys for each line of text are temporarily stored in a read/write memory to permit editing operations and are erased at the onset of the next line.
    • 用于安全数据通信系统的装置包括微机,其控制在传输之前将敏感数据加密的加密过程。 当激活时,设备接受明文或密文,并根据过去依赖的算法将文本转换为相反的形式,并且还依赖于伪随机密码密钥。 密文然后可以存储在信息检索系统中,或者通过存储相同密钥的对应的第二设备实时地传送到文本被解密的目的地终端。 在这两种情况下,由于敏感数据是加密形式,所以保持发送和存储的数据的安全性。 根据该算法的一组逻辑指令存储在微计算机的只读存储器中,该存储器包括具有预定字符的数据字段的EPROM单元。 密码过程由控制字符发起,并以预定的种子开始,该预定种子在数据字段中为要加密的每一行文本建立第一个起始点。 响应于由计数器随机生成的四个字符,该起始点被转换为数据字段的第二个起始位置。 迭代逻辑运算的可变序列将明文变换为密文,并提供非线性,随机样式的密钥流,并且具有比任何行的周期长的加密周期,使得密钥流的周期性为 没有指出 每行文本的密码密钥临时存储在读/写存储器中,以允许编辑操作,并在下一行开始时被擦除。
    • 5. 发明申请
    • Display driver circuits for organic light emitting diode displays with skipping of blank lines
    • 显示带有空白线的有机发光二极管显示器的驱动电路
    • US20050219163A1
    • 2005-10-06
    • US10512379
    • 2003-04-22
    • Euan SmithPaul RoutleyWilliam Goodchild
    • Euan SmithPaul RoutleyWilliam Goodchild
    • G09G3/30G09G3/32
    • G09G3/3216G09G2310/0213G09G2310/04G09G2320/0209G09G2330/021G09G2360/18
    • Display driver circuits are described for driving organic light-emitting diode displays, particularly passive matrix displays, with greater efficiency. Display driver circuitry includes a frame memory interface for reading data from a frame memory for presentation on a passive matrix OLED display. A blank line identifier identifies one or more substantially blank rows of pixels defined by the data in the frame memory and the control circuitry skips past these rows when the passive matrix display is addressed. When blank lines are skipped the apparent brightness of the remaining lines increases and thus preferably the control circuitry includes a power-controller for reducing a power supply to the display in proportion to the number of skipped lines. The disclosed circuitry is particularly suited to a display driver providing a controlled current drive.
    • 描述显示驱动器电路用于以更高的效率驱动有机发光二极管显示器,特别是无源矩阵显示器。 显示器驱动器电路包括用于从帧存储器读取数据以呈现在无源矩阵OLED显示器上的帧存储器接口。 空白行标识符识别由帧存储器中的数据定义的一个或多个基本空白行的像素,并且当无源矩阵显示被寻址时,控制电路跳过这些行。 当空白行被跳过时,剩余行的表观亮度增加,因此优选地,控制电路包括功率控制器,用于与跳过的行数成比例地减少对显示器的电力供应。 所公开的电路特别适用于提供受控电流驱动器的显示驱动器。