Planar alphanumeric display

• US 4,291,307 A
• Filed: 03/19/1979
• Issued: 09/22/1981
• Est. Priority Date: 03/19/1979
• Status: Expired due to Term

• Current Assignee: ITT Corporation (ITT, Inc.)
• Original Assignee: International Telephone & Telegraph Corp. (ITT, Inc.)
• Inventors: Kolter, Roland K., Peelle, Thomas B.
• Primary Examiner(s): Curtis, Marshall M.
• Application Number:
  US06/022,085
• Time in Patent Office: 918 Days
• Field of Search: 340/756, 340/758, 340/759, 340/765
• US Class Current: 345/33
• CPC Class Codes: G02F 1/134327 Segmented, e.g. alpha numeric display
• CPC Class Codes: G09F 9/302 characterised by the form or geometrical disposition of the individual elements
• CPC Class Codes: G09G 3/16 by control of light from an independent source

Abstract

A display device for alphanumeric characters using a sixteen segment configuration for each character, eight segments in an outer ring and eight segments in an inner configuration. The segments are joined in an eight-by-two matrix which is multiplexed, there being two time intervals for each character. The display medium may be liquid crystal or any other known dual plane medium such as colloidal suspension. In one plane, the inner eight segments are multiplexed into one group, while a second group multiple extends to the external eight segments. In the other plane, each outer segment is connected in series with an inner segment to form eight segment pairs. To display a desired character, selected pairs in one plane are energized with either the inner or outer multiple during one time interval to illuminate all segments common to the selected pairs and the selected group. During a second time interval, other selected pairs are energized with the other group. Successive characters are driven sequentially.

Claims

1. A plural character alphanumeric display, in which said display is comprised of two panels in spaced superimposed relationship with an optical medium therebetween, and said characters comprise complementary arrays of conductive segments at plural character locations on both said panels in aligned superimposed relationship adapted to be driven in a pattern by the application of a voltage to selected segments on both of said panels, the invention wherein each of said characters is comprised of a plurality of segments including a first group of segments forming the periphery of the character and a second group of segments radially disposed within the character, there being a like number of segments in each group, and wherein on a first of said panels the segments of the first group of each character are connected for driving connection to a voltage source, and the segments of the second group of each character are connected for driving connection to a voltage source, with the connection from both groups from each character being in multiple with the conductors from the like group of said other characters, and in which on the other panel, the segments of each character are paired with the segment of each pair being in alignment with separate groups within the character and each pairing is connected to a like pairing of the remaining characters for multiplexing of characters in a two step sequence by selective driving of selected pairings simultaneously with selective driving of the first and second groups of respective successive characters to illuminate selected alphanumeric characters at each of said locations.

2. A display as claimed in claim 1, in which said second group includes segments radially disposed and angularly separated by approximately 45°

of arc.

3. A display as claimed in claim 1, in which said multiplexing is comprised of segment pairs being selectively driven along with the driving of a group of one character to illuminate segments of selected pairs having a segment in the driven group and thereafter driving a second selection of segments along with the driving of the other group of said one character to illuminate segments of selected pairs and said group and thereby illuminate a selected character at one location and thereafter successively multiplexing selected characters at the remaining locations.