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US 2011/0225859 A1Published application
Lcd tft sign for on-board use in public transportation
AssigneeLuminator Holding LP
InventorRAMIN SAFAVI
Life of this patent
Estimating the term…
Abstract
An LCD destination sign is provided that provides a high resolution image and operates in at least two modes. One mode is a destination message mode that is used when a destination message (i.e., a route number and/or destination name in substantially static alphanumeric or symbols) is to be displayed on the destination sign. The second mode is a non-destination mode wherein graphic images are displayed on the destination sign, wherein such graphic images do not provide a destination message and may include video feeds, weather forecasts or newsreels.
Claims19
A destination sign comprising:
- a front bezel assembly comprising:
- a bezel front side;
- bezel side walls extending backwards from the periphery of the bezel front side to establish a bezel enclosure about a bezel backside;
- and
- an aperture through the bezel front side to the bezel backside, the aperture having a width to height ratio of between about 8:1 and 4:1;
- a transparent cover sheet positioned against the bezel backside and covering the aperture;
- a color LCD display panel mounted within the bezel enclosure and behind the transparent cover sheet such that a display surface of the color LCD display panel faces the aperture, the display surface having an aspect ratio of between about 8:1 and about 4:1, the color LCD display panel adapted to produce a first image at a first resolution;
- a backlight assembly, positioned within the bezel enclosure and behind the color LCD display panel such that an illumination surface of the backlight assembly faces the aperture, the illumination surface comprises an array of red, green and blue LEDs adapted to produce a first illumination output comprising the first image at a second resolution wherein the second resolution is the same as or a lower resolution than the first resolution and adapted to produce a second output comprising substantially white light;
- a graphic data bus, connected to the color LCD display panel, adapted to provide a first graphic data signal, the first graphic data signal comprising the first image formatted for display on the color LCD display panel;
- and
- a mode signal connection adapted to provide a mode signal to the backlight assembly, wherein when the mode signal indicates a destination message mode then the first output is produced on the illumination surface, and wherein when the mode signal indicates a non-destination message mode then the second output is produced on the illumination surface.
8 more elements
A destination sign comprising:
- a color LCD display panel comprising a front display area having an aspect ratio of between about 8:1 and about 4:1, the color LCD display panel adapted to produce a first image at a first resolution;
- a backlight assembly, positioned behind the color LCD display panel such that an illumination surface of the backlight assembly faces a backside of the color LCD display panel, the illumination surface comprises an array of clustered red, green and blue LEDs adapted to produce a first illumination output comprising the first image at a second resolution wherein the second resolution is the same as or a lower resolution than the first resolution and adapted to produce a second illumination output comprising substantially white light;
- a graphic data bus, connected to the color LCD display panel, adapted to provide a first graphic data signal, the first graphic data signal comprising the first image formatted for display on the color LCD display panel;
- and
- a mode signal connection adapted to provide a mode signal to the backlight assembly, wherein when the mode signal indicates a destination message mode then the first output is produced on the illumination surface, and wherein when the mode signal indicates a non-destination message mode then the second output is produced on the illumination surface.
2 more elements
A method of displaying a destination message on a backlit LCD destination sign, wherein the backlit LCD destination sign comprising a color LCD display panel and backlight assembly adapted to backlight the color LCD display panel, the method comprising:
- receiving a first image signal by the backlit LCD destination sign;
- determining, by a mode select circuit, whether the first image signal is for a destination message image or a non-destination message image;
- when the mode select circuit determines that the first image is for a destination message image, then simultaneously displaying the destination message image on the color LCD display panel and on the backlight assembly;
- when the mode select circuit determines that the first image is for a non-destination message image, then displaying the non-destination message image on the color LCD display panel and illuminating the backlight assembly to produce substantially white light.
1 more element
Dependencies are inferred from the claim text.