Liquid Crystal Displays With Minimized Transmission Loss and Enhanced Off-Axis Color Fidelity
First Claim
1. A liquid crystal display having an array of pixels;
- an upper polarizer;
a lower polarizera layer of liquid crystal material;
a color filter layer between the lower polarizer and the layer of liquid crystal material; and
a thin-film transistor layer between the layer of liquid crystal material and the upper polarizer, wherein the thin-film transistor layer comprises;
a substrate layer;
a patterned layer of opaque masking material with openings for the pixels;
a first dielectric layer that covers the patterned layer of opaque masking material;
a second dielectric layer; and
a third dielectric layer interposed between the first and second dielectric layers, wherein the first dielectric layer has a first index of refraction, wherein the second dielectric layer has a second index of refraction that is different than the first index of refraction, and wherein the third dielectric layer has a graded index of refraction to minimize reflections arising from a difference between the first and second indices of refraction.
1 Assignment
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Accused Products
Abstract
A display may have upper and lower display layers. A layer of liquid crystal material may be interposed between the upper and lower display layers. The display layers may have substrates. The display layers may include a color filter layer having an array of color filter elements on a glass substrate and a thin-film transistor layer having a layer of thin-film transistor circuitry on a glass substrate. Dielectric layers within the display layers such as dielectric layers within the thin-film transistor layer may have differing indices of refraction. Reflections and color shifts due to index of refraction discontinuities may be minimized by interposing graded index dielectric layers between adjacent layers with different indices. The graded index layers may be formed from structures with a continuously varying index of refraction or structures with a step-wise varying index of refraction.
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Citations
22 Claims
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1. A liquid crystal display having an array of pixels;
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an upper polarizer; a lower polarizer a layer of liquid crystal material; a color filter layer between the lower polarizer and the layer of liquid crystal material; and a thin-film transistor layer between the layer of liquid crystal material and the upper polarizer, wherein the thin-film transistor layer comprises; a substrate layer; a patterned layer of opaque masking material with openings for the pixels; a first dielectric layer that covers the patterned layer of opaque masking material; a second dielectric layer; and a third dielectric layer interposed between the first and second dielectric layers, wherein the first dielectric layer has a first index of refraction, wherein the second dielectric layer has a second index of refraction that is different than the first index of refraction, and wherein the third dielectric layer has a graded index of refraction to minimize reflections arising from a difference between the first and second indices of refraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A liquid crystal display having an array of pixels;
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an upper polarizer; a lower polarizer a layer of liquid crystal material; a color filter layer between the upper polarizer and the layer of liquid crystal material; and a thin-film transistor layer between the layer of liquid crystal material and the lower polarizer, wherein the thin-film transistor layer comprises; a substrate layer; a first dielectric layer having a first index of refraction; and a second dielectric layer having a second index of refraction; and a graded index dielectric layer that is interposed between the first and second dielectric layers. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A liquid crystal display having an array of pixels;
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an upper polarizer; a lower polarizer a layer of liquid crystal material; a color filter layer between the upper polarizer and the layer of liquid crystal material; and a thin-film transistor layer between the layer of liquid crystal material and the lower polarizer, wherein the thin-film transistor layer comprises; a substrate layer having a first index of refraction; a dielectric buffer layer having a second index of refraction that is different than the first index of refraction; and a graded index dielectric layer that is interposed between the substrate and the dielectric buffer layers. - View Dependent Claims (20, 21, 22)
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Specification