Video system for assisting automobile traffic employing a segmented LCD display

• US 4,409,583 A
• Filed: 05/21/1981
• Issued: 10/11/1983
• Est. Priority Date: 02/23/1981
• Status: Expired due to Fees

• Current Assignee: Phac Letuan, Pierre-Louis Dahan
• Original Assignee: Phac Letuan, Pierre-Louis Dahan
• Inventors: Letuan, Phac, Dahan, Pierre-Louis
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US06/265,797
• Time in Patent Office: 873 Days
• Field of Search: 340/22, 340/765, 340/752
• US Class Current: 340/995.13
• CPC Class Codes: G08G 1/0969 having a display in the form of a map
• CPC Class Codes: G09B 29/106 using electronic means

Abstract

Radio system for video display of a map and symbols traced on the map: It comprises means for radio transmitting a plurality of digital messages, each including the address of a map among a plurality of maps, the definition of symbols among a plurality of symbols and the coordinates of the symbols on the map. At the receiving station, there is provided a display device having a plurality of points defined by coordinates and which can be selectively activated, a plurality of transparent views representing the maps and a selector for selecting a view of given address. The selected view is projected on to the display device. The message including a map address equal to the address of the selected view is also selected and display logic means activates the points of the display device in response to the definition and coordinates of the symbols contained in the selected message.

Claims

1. Radio system for video display of a map and symbols traced on said map comprising:

means for radio transmitting a plurality of digital messages, each including the address of a map among a plurality of maps, the definition of symbols among a plurality of symbols and the coordinates of said symbols on said map;

a display device having a plurality of points defined by coordinates and which can be selectively activated;

a plurality of transparent views representing said maps and having addresses assigned thereto;

means for selecting from among said view plurality the view having a given address;

means for projecting the selected view on to said display device;

means for selecting from among said address message-plurality the message including a map address equal to said selected view address; and

display logic means for activating selected points of the display device in response to the definition and coordinates of the symbols contained in the selected message.

2. Radio system as set forth in claim 1 in which the display device is a large area transflective viewing mode liquid crystal display.

3. Radio system as set forth in claim 1 in which the transparent views are transparencies.

4. Radio system as set forth in claim 1 in which the transparent veiws are views in a film cassette.

5. Radio system for video display of a map and symbols traced on said map comprising:

means for radio transmitting sequentially a plurality of digital messages, each including the address of a map among a plurality of maps, the definition of symbols among a plurality of symbols and the coordinates of said symbols on said map, the symbols in a given message being classified, with respect to the symbols in the preceding message relative to the same map address, as symbols to be deleted, symbols to be held and new symbols, each of said symbol classes being designated by a flag;

a display device having a plurality of points defined by coordinates and which can be selectively activated;

a plurality of transparent views representing said maps and having addresses assigned thereto;

means for selecting from among said view plurality the view having a given address;

means for projecting the selected view onto said display device;

means for selecting from among said address-message plurality the message including a map address equal to said selected view address; and

a display logic means controlled by said flags for de-activating the points of the display device in response to the definition and coordinates of the symbols to be deleted, continuing the activation of the points of the display device in response to the definition and coordinates of the symbols to be held and activating the points of the display device in response to the definition and coordinates of the new symbols.