Flexible LED assemblies and LED light bulbs

Abstract

LED assemblies and related LED light bulbs. An LED assembly has a flexible, transparent substrate, an LED chip on the first surface and electrically connected to two adjacent conductive sections, a first wavelength conversion layer, formed on the first surface to substantially cover the LED chip, and a second wavelength conversion layer formed on the second surface. The flexible, transparent substrate has first and second surfaces opposite to each other, and several conductive sections, which are separately formed on the first surface.

What is claimed is: 
     
       1. An LED assembly A light bulb comprising:
 a flexible, and transparent substrate, comprising: a first surface, a second surface opposite to the first surface, and an end; 
 an LED chip, which is flipped mounted on to the first surface; 
 first and second surfaces opposite to each other; and 
 several a first conductive sections, separately formed section and a second conductive section successively formed on the first surface and separated from each other; 
 
 an LED chip on the first surface and electrically connected to two adjacent conductive sections; 
 a first wavelength conversion layer, formed on the first surface to substantially cover flexible and transparent substrate and directly contacting the LED chip, the first conductive section, and the second conductive section; and 
 a second wavelength conversion layer formed on the second surface; and 
 a conductive wire, formed on the first surface, extended beyond the end, and electrically connected to the LED chip, 
 wherein, in a direction perpendicular to the first surface, the LED chip is overlapped with the first conductive section and the second conductive section, 
 wherein the second conductive section has a wider portion and a narrower portion, and the wider portion is exposed from the first wavelength conversion layer, and 
 wherein the first conductive section has a uniform width, and the second conductive section has a varying width. 
 
     
     
       2. The LED assembly as claimed in  claim 1 , wherein the transparent substrate is a longitudinal strip with two opposite ends, and the LED assembly comprises LED chips arranged in a first row along a longitudinal line connecting the opposite ends. 
     
     
       3. The LED assembly as claimed in  claim 1 , wherein the flexible, transparent substrate further comprises a sidewall connecting the first and second surfaces, and at least a portion of the sidewall is not covered by the first wavelength conversion layer. 
     
     
       4. The LED assembly light bulb as claimed in  claim 1 , wherein the first conductive sections are section is transparent in view of the to light emitted from the LED chip. 
     
     
       5. The LED assembly light bulb as claimed in  claim 1 , wherein at least one of the conductive sections has a wider portion not covered by is exposed from the first second wavelength conversion layer. 
     
     
       6. The LED assembly as claimed in  claim 1 , wherein the LED chip is flipped over and mounted on the first surface. 
     
     
       7. The LED assembly light bulb as claimed in  claim 1 , wherein the first wavelength conversion layer comprises a phosphor and the second wavelength conversion layer are extended along a same direction. 
     
     
       8. The LED assembly light bulb as claimed in  claim 1 , wherein the LED assembly flexible and transparent substrate is capable of being curved to be a tape on a reel. 
     
     
       9. An LED light bulb, The light bulb as claimed in claim 1, further comprising:
 a base; and  
 a lamp bulb, fixed on the base to define an inner space; and 
 wherein the LED assembly claimed in  claim 1 chip is positioned inside the inner space and electrically connected to the base. 
 
     
     
       10. The LED light bulb as claimed in  claim 9 , wherein the LED assembly is curved to have an arc. 
     
     
       11. The LED light bulb as claimed in claim  9  1, wherein the LED light bulb has a an imaginary screw axis and the LED assembly flexible and transparent substrate is substantially curved to be on a an imaginary plane which is substantially perpendicular to the screw axis. 
     
     
       12. The LED light bulb as claimed in claim  11  1, wherein the LED assembly flexible and transparent substrate is capable of being curved to substantially be in a shape of a circle. 
     
     
       13. The LED light bulb as claimed in  claim 9 , further comprising two conductive wires respective connected to two of the conductive sections. 
     
     
       14. The light bulb as claimed in claim 1, further comprising a support supporting the flexible and transparent substrate.  
     
     
       15. The light bulb as claimed in claim 14, wherein the support is not arranged on the end of the flexible and transparent substrate.  
     
     
       16. The light bulb as claimed in claim 14, wherein the support is substantially thinner than the flexible and transparent substrate.  
     
     
       17. The light bulb as claimed in claim 14, wherein the support has a portion substantially surrounding the flexible and transparent substrate.