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; and
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, andwherein the backplane, light emitters, and backplane conductors form a single-backplane backlight for the plurality of light valves.
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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.
395 Citations
22 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; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. 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; and 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. - View Dependent Claims (22)
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Specification