Light emitting device with microlens array
First Claim
1. A light-emitting device, comprising:
- a light emitting element on a first side of a transparent substrate or cover through which light is emitted; and
a microlens array on a second side, opposite to the first side, of the transparent substrate or cover though which light is emitted;
wherein the microlens array has a refractive index greater than 1.45 and an elastic modulus of at least 1,000 kPa and comprises individual microlenses having a mean diameter of less than 20 micrometers that are randomly distributed over 300 μ
m×
300 μ
m areas of the microlens array.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of manufacturing a micro-lens array and light-emitting device, including forming a first structured polymer film with close packed surface cavities having a mean diameter of less than 20 micrometers and a relatively lower surface energy surface, forming a transparent second structured film with an array of microlenses formed thereon corresponding to the cavities of the first structured film, wherein the second structured film includes a relatively high surface energy material and has a refractive index greater than 1.45, and wherein the microlenses are randomly distributed, separating the second structured film with the micro-lens array from the first structured polymer film, and attaching the second structured film to a transparent substrate or cover of a light-emitting device through which light is emitted. Use of microlens arrays formed from relatively high surface energy materials enables matching refractive index of microlens array to that of light-emitting devices substrate or cover through which light is emitted and relatively high elastic modulus providing good scratch resistance.
12 Citations
6 Claims
-
1. A light-emitting device, comprising:
-
a light emitting element on a first side of a transparent substrate or cover through which light is emitted; and a microlens array on a second side, opposite to the first side, of the transparent substrate or cover though which light is emitted; wherein the microlens array has a refractive index greater than 1.45 and an elastic modulus of at least 1,000 kPa and comprises individual microlenses having a mean diameter of less than 20 micrometers that are randomly distributed over 300 μ
m×
300 μ
m areas of the microlens array. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification