Reflective Hollow Pedestal LED Optics for Narrow Beam Backlighting
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Solution Overview
Problem
LEDs in display systems emit light at wide angles, which may not be collected by the collection optic or optical system, leading to inefficiencies in backlighting LCOS and other displays.
Innovation Solution
The use of a hollow pedestal with reflective interior surfaces and a light transmitting optical element to control and narrow the radiation pattern of LEDs, ensuring efficient light collection and distribution for displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are used to backlight displays, then light emission is achieved, but light is emitted at wide angles which cannot be collected by the collection optic
Solution Approach 1:
The invention segments the light emission by introducing multiple optical elements (first optical element and second optical element) that separately control different angular ranges of light. The first optical element handles light at certain angles while the second optical element handles light at other angles, thereby segmenting the wide-angle emission into collectible segments that can be efficiently directed to the display.
Solution Approach 2:
The patent introduces optical elements as intermediary components between the LED light source and the collection optic. These optical elements act as mediators that redirect and condition the wide-angle light emission, transforming it into a form that the collection optic can effectively capture and utilize for backlighting the display.
2Use of energy by moving object
If wide angle light emission is used, then LED efficiency is maintained, but light is incident on the collection optic at undesirably large angles
Solution Approach 1:
The optical elements are designed with dynamic angular characteristics, where different portions of the optical elements redirect light at different angles. This dynamic approach allows the system to maintain LED efficiency by accepting wide-angle emission while dynamically steering the light into appropriate angular ranges for reliable collection by the optics.
Solution Approach 2:
The patent changes the angular parameter of light emission by introducing optical elements that modify the propagation direction of light. These optical elements transform the wide-angle emission parameter into a narrower, more controllable angular distribution that ensures reliable incident angles on the collection optic while preserving overall LED efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a narrowed radiation pattern that effectively directs light to the collection optic, enhancing the efficiency of backlighting in LCOS and other displays.
Implementation Method 1
a hollow pedestal comprising side walls having reflective interior surfaces that define sides of an internal cavity
Data Source
AI summary
An LED light source comprises a hollow pedestal comprising side walls having reflective interior surfaces that define sides of an internal cavity. An LED mounting surface is disposed within the cavity, with one or more LEDs disposed on the LED mounting surface. A light transmitting optical element is disposed opposite from the mounting surface, spaced apart from the one or more LEDs, and supported by the pedestal side walls. The LED light source provides a narrowed radiation pattern that may, for example, be advantageously employed for backlighting LCOS and other displays.