Electronic display apparatus with scrolling function

• US 5,125,078 A
• Filed: 02/27/1989
• Issued: 06/23/1992
• Est. Priority Date: 02/26/1988
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Matsuda, Eichika, Oba, Toshiro
• Primary Examiner(s): Eng, David Y.
• Application Number:
  US07/315,811
• Time in Patent Office: 1,212 Days
• Field of Search: 364/710, 364/709, 364/706, 364/200 MS File, 364/900 MS File
• US Class Current: 345/56
• CPC Class Codes: G06F 15/0283 for data storage and retrieval
• CPC Class Codes: H04M 1/275 implemented by means of portable electronic directories

Abstract

A portable electronic device provided with an input portion, an LCD having both dot matrix and segment display portions, a memory for storing input character and numerical information, a write/read portion performing write/read operations on character and numerical information for the memory, a buffer for temporarily storing information which has been previously read or written, a display control portion which outputs the character information in the buffer to the dot matrix display portion and the numerical information to the segment display portion, respectively, and a conversion portion which, when the numerical information exceeds the display digit number of the segment display portion, converts the numerical information contained in the segment display into dot matrix display data and transfers it to the dot matrix display portion for display, and at the same time, displays the numerical information which exceeds the display digit number on the segment display portion which has become an empty area due to the transfer.

Claims

1. An electronic display device with scrolling function, the device comprising:

input means for inputting character information, numerical information and commands;

data buffer means for storing said character and numerical information in a readable form;

write/read means for outputting information from the input means to the data buffer means and for reading information from the data buffer means;

display buffer means for temporarily storing information output from the write/read means, wherein said display buffer means includes a segment character display storage means for storing character information in a form for display on a segment character display and a dot matrix display storage means for storing numerical information in a form for display on a dot matrix display;

display means for displaying said character and numerical information, stored in said display buffer means, said display means including a dot matrix display portion and a segment display portion;

display control means for selectively converting the information stored in said display buffer means into information for display on the dot matrix display portion or segment display portion and outputting said converted information to the appropriate display portion.

decision means for outputting a signal when numerical information stored in the dot matrix display storage means exceeds a predetermined character number, and for outputting a signal when display change-over instruction is received from said input means, respectively; and

conversion means, responsive to said decision means, for converting the numerical information stored in said segment character display storage means into a format for display on said dot matrix display portion, and at the same time, converting the numerical information exceeding said predetermined character number from the buffer display means for display on the segment display portion.

2. The electronic display device according to claim 1 wherein said display means further comprising a liquid crystal display unit with a dot matrix display portion capable of displaying up to 12 characters or numerals and a segment display portion capable of displaying up to 12 characters or numerals.

3. The electronic device according to claim 1, wherein the conversion means further comprises a data conversion circuit having a shift register for increasing segment display 4-bit information to dot matrix display 8-bit information and two 4-bit latches for holding the increased 8-bit information produced by said shift register.

4. The electronic device according to claim 1, wherein the storage means further comprising a random access memory for storing character information and numerical information in records of variable length.