Micro-light-emitting diode backlight system
First Claim
Patent Images
1. A display having a display area, comprising:
- a single backplane;
a plurality of bare die light emitters disposed on the backplane in a two-dimensional array within the display area, each light emitter comprising a light-emitter substrate and contact pads on the light-emitter substrate through which electrical current is supplied to cause the light emitter to emit light, wherein the light-emitter is a micro-LED that has been micro-transfer printed from a source substrate and has a width from 2 to 5 μ
m, 5 to 10 μ
m, 10 to 20 μ
m, or 20 to 50 μ
m;
a plurality of backplane conductors disposed on the backplane in the display area for conducting control signals to control the light emitters through electrodes formed on and in physical contact with the light emitters and in electrical contact with the contact pads;
a plurality of light valves disposed to receive light from the light emitters, wherein the number of light valves is greater than the number of light emitters; and
a backlight controller that controls the light emitters,wherein the backplane, light emitters, and backplane conductors form a single-backplane backlight for the plurality of light valves,wherein the backplane includes a first portion having two or more first light emitters and a second portion spatially separate from the first portion having two or more second light emitters and the backlight controller controls the first and second light emitters so that the first portion emits light of a first brightness greater than zero and the second portion emits light of a second brightness greater than the first brightness by controlling at least one of the first light emitters to emit no light.
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Accused Products
Abstract
A backlight system includes a backplane and a plurality of bare die light emitters disposed on the backplane. Each light emitter has a light-emitter substrate and contact pads on the light-emitter substrate through which electrical current is supplied to cause the light emitter to emit light. A plurality of first and second backplane conductors are disposed on the backplane for conducting control signals to control the light emitters through the contact pads. A plurality of light valves is disposed to receive light from the light emitters. The number of light valves is greater than the number of light emitters.
337 Citations
21 Claims
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1. A display having a display area, comprising:
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a single backplane; a plurality of bare die light emitters disposed on the backplane in a two-dimensional array within the display area, each light emitter comprising a light-emitter substrate and contact pads on the light-emitter substrate through which electrical current is supplied to cause the light emitter to emit light, wherein the light-emitter is a micro-LED that has been micro-transfer printed from a source substrate and has a width from 2 to 5 μ
m, 5 to 10 μ
m, 10 to 20 μ
m, or 20 to 50 μ
m;a plurality of backplane conductors disposed on the backplane in the display area for conducting control signals to control the light emitters through electrodes formed on and in physical contact with the light emitters and in electrical contact with the contact pads; a plurality of light valves disposed to receive light from the light emitters, wherein the number of light valves is greater than the number of light emitters; and a backlight controller that controls the light emitters, wherein the backplane, light emitters, and backplane conductors form a single-backplane backlight for the plurality of light valves, wherein the backplane includes a first portion having two or more first light emitters and a second portion spatially separate from the first portion having two or more second light emitters and the backlight controller controls the first and second light emitters so that the first portion emits light of a first brightness greater than zero and the second portion emits light of a second brightness greater than the first brightness by controlling at least one of the first light emitters to emit no light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of operating a display, the method comprising:
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receiving an image having image portions corresponding to a display portion and a backlight portion; analyzing the image to determine backlight luminance output values for each image portion; calculating the number of light emitters needed to provide the determined backlight luminance for each portion; and turning on the number of calculated light emitters in each portion, wherein the display has a display area, and the display comprises; a single backplane; a plurality of bare die light emitters disposed on the backplane in a two-dimensional array within the display area, each light emitter comprising a light-emitter substrate and contact pads on the light-emitter substrate through which electrical current is supplied to cause the light emitter to emit light, wherein the light emitter is a micro-LED that has been micro-transfer printed from a source substrate and has a width from 2 to 5 μ
m, 5 to 10 μ
m, 10 to 20 μ
m, or 20 to 50 μ
m;a plurality of backplane conductors disposed on the backplane in the display area for conducting control signals to control the light emitters through electrodes formed on and in physical contact with the light emitters and in electrical contact with the contact pads; a plurality of light valves disposed to receive light from the light emitters, wherein the number of light valves is greater than the number of light emitters, and wherein the backplane, light emitters, and backplane conductors form a single-backplane backlight for the plurality of light valves; and a backlight controller that controls the light emitters, wherein the backplane includes a first portion having two or more first light emitters and a second portion spatially separate from the first portion having two or more second light emitters and the backlight controller controls the first and second light emitters so that the first portion emits light of a first brightness greater than zero and the second portion emits light of a second brightness greater than the first brightness by controlling at least one of the first light emitters to emit no light. - View Dependent Claims (21)
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Specification