Thin hollow backlights with beneficial design characteristics
First Claim
1. An edge-lit backlight, comprising:
- a front and back reflector forming a hollow light recycling cavity having a cavity depth H and an output region of area Aout; and
one or more light sources disposed proximate a periphery of the backlight to emit light into the light recycling cavity, the light sources having an average plan view source separation of SEP and collectively having an active emitting area Aemit;
wherein a first parameter equals Aemit/Aout;
wherein a second parameter equals SEP/H;
wherein the backlight is characterized by the first parameter being in a range from 0.0001 to 0.1, and by the second parameter being in a range from 3 to 10; and
wherein the front reflector has a hemispherical reflectivity for unpolarized visible light of Rfhemi, and the back reflector has a hemispherical reflectivity for unpolarized visible light of Rbhemi, and Rfhemi*Rbhemi is at least 0.70.
1 Assignment
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Accused Products
Abstract
An edge-lit backlight comprises a front and back reflector forming a hollow light recycling cavity having a cavity depth H and an output region of area Aout, and one or more light sources disposed proximate a periphery of the backlight to emit light into the light recycling cavity. The light sources have an average plan view source separation of SEP collectively having an active emitting area Aemit, wherein a first parameter equals Aemit/Aout and a second parameter equals SEP/H. The first parameter is in a range from 0.0001 to 0.1, and by the second parameter is in a range from 3 to 10. The front reflector has a hemispherical reflectivity for unpolarized visible light of Rfhemi, and the back reflector has a hemispherical reflectivity for unpolarized visible light of Rbhemi, and Rfhemi*Rbhemi is at least 0.70.
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Citations
17 Claims
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1. An edge-lit backlight, comprising:
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a front and back reflector forming a hollow light recycling cavity having a cavity depth H and an output region of area Aout; and one or more light sources disposed proximate a periphery of the backlight to emit light into the light recycling cavity, the light sources having an average plan view source separation of SEP and collectively having an active emitting area Aemit; wherein a first parameter equals Aemit/Aout; wherein a second parameter equals SEP/H; wherein the backlight is characterized by the first parameter being in a range from 0.0001 to 0.1, and by the second parameter being in a range from 3 to 10; and wherein the front reflector has a hemispherical reflectivity for unpolarized visible light of Rfhemi, and the back reflector has a hemispherical reflectivity for unpolarized visible light of Rbhemi, and Rfhemi*Rbhemi is at least 0.70. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An edge-lit backlight, comprising:
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a front and back reflector forming a hollow light recycling cavity having a cavity depth H and an output region of area Aout; and a number N of one or more light sources disposed proximate a periphery of the light recycling cavity and emitting light into the light recycling cavity; wherein the output region is generally rectangular in shape and has a diagonal measure of at least 30 inches; wherein the output region exhibits a VESA 9 uniformity value of at least 50%; wherein the one or more light sources have an average plan view source separation of SEP and collectively have an active light emitting area Aemit; wherein a first parameter equals Aemit/Aout; wherein a second parameter equals SEP/H; and wherein the backlight is characterized by the first parameter being in a range form 0.0001 to 0.1, and by the second parameter being in a range from 3 to 10. - View Dependent Claims (12, 13)
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14. A backlight, comprising:
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a front and back reflector forming a hollow light recycling cavity having an output region; and a number N of light sources disposed to emit light into the light recycling cavity, the N light sources including a subset of M light sources that are adjacent to each other, where M is at least 10% of N, or is at least 2, or both; wherein the backlight exhibits a VESA brightness uniformity value over its output region of at least 50% both when all N light sources are energized and when all of the M light sources are selectively turned off; and wherein the front reflector has a hemispherical reflectivity for unpolarized visible light of Rfhemi, and the back reflector has a hemispherical reflectivity for unpolarized visible light of Rbhemi, and Rfhemi * Rbhemi is at least 0.70. - View Dependent Claims (15, 16, 17)
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Specification