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US 11,307,344 B2Granted
Dual view zone backlight, dual-mode display, and method
AssigneeLeia Inc.
InventorsDavid A. Fattal, Andre Krebbers
Life of this patent
Estimating the term…
Abstract
A dual view zone backlight and dual-mode display employ a first backlight region to provide directional emitted light toward a first view zone and a second backlight region to provide broad-angle emitted light toward the first and a second view zone in a first mode. The dual-mode display includes a second backlight to provide broad-angle light toward both the first view zone and the second view zone in a second mode.
Claims18
A dual view zone backlight comprising:
- a first backlight region of a single light guide configured to emit directional emitted light toward a first view zone, the first backlight region comprising a directional scattering feature configured to scatter out of the single light guide a portion of guided light guided by the single light guide as the directional emitted light from a portion of the single light guide corresponding to the first backlight region;
- and
- a second backlight region of the single light guide configured to emit broad-angle emitted light toward both the first view zone and a second view zone, the second backlight region being adjacent to the first backlight region and comprising a broad-angle scattering feature configured to scatter out of the single light guide another portion of the guided light as the broad-angle emitted light from another portion of the single light guide corresponding to the second backlight region,
- wherein a viewing range of the first view zone has a direction that differs from a direction of a viewing range of the second view zone.
1 more element
A dual-mode display comprising:
- a dual view zone backlight configured to emit light during a first mode, the light being emitted from a first backlight region of a single light guide toward a first view zone as directional emitted light and from a second backlight region of the single light guide toward both the first view zone and a second view zone as broad-angle emitted light, the second backlight region being laterally adjacent to the first backlight region;
- a broad-angle backlight adjacent to the dual view zone backlight and configured to emit light during a second mode through the dual view zone backlight toward both the first and second view zones as broad-angle light;
- and
- an array of light valves configured to modulate the light emitted by the dual view zone backlight and the broad-angle backlight to provide a displayed image.
1 more element
A method of dual view zone backlight operation, the method comprising:
- guiding light in a single light guide as guided light;
- emitting directional emitted light toward a first view zone using a first backlight region of the single light guide, emitting directional light comprising scattering out a portion of the guided light as the directional emitted light using a directional scattering feature located along a portion of the single light guide corresponding to the first backlight region;
- and
- emitting broad-angle emitted light toward both the first view zone and a second view zone using a second backlight region of the single light guide, emitting broad-angle emitted light comprising scattering out another portion of the guided light as the broad-angle emitted light using a broad-angle scattering feature located along another portion of the single light guide corresponding to the second backlight region,
- wherein a viewing range of the first view zone differs both in viewing angle and direction from a viewing angle and direction of a viewing range of the second view zone, and wherein the second backlight region of the single light guide is adjacent to the first backlight region of the single light guide.
2 more elements
Dependencies are inferred from the claim text.