Reflective Pyramid Illuminator Assembly for LCD Brightness
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Solution Overview
Problem
Liquid crystal displays using LEDs face challenges with limited light divergence angles, requiring multiple LEDs to achieve sufficient brightness, which leads to excessive heat generation.
Innovation Solution
An illuminator assembly featuring a plurality of LED chips and reflective pyramids, where the pyramids are arranged to reflect light emitted by the LEDs towards an optical film assembly, increasing brightness while reducing the number of LEDs needed and minimizing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are used to achieve sufficient brightness, then illumination intensity is improved, but heat generation increases
Solution Approach 1:
A reflective pyramid structure is introduced as an intermediary element between the LED and the optical film. This pyramid reflects and redirects light from the LED, improving light utilization efficiency and brightness without requiring additional LEDs, thereby avoiding extra heat generation from increased LED count
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a reflective pyramid with specific geometric characteristics. This modifies the light distribution pattern and improves illumination intensity while maintaining the same LED count, thus avoiding the heat generation problem associated with using more LEDs
2Illumination intensity
If multiple LEDs are used to achieve sufficient brightness, then illumination intensity is improved, but device complexity increases
Solution Approach 1:
The reflective pyramid serves as a mediating optical element that enhances the effectiveness of each individual LED. By improving light distribution and utilization through the pyramid structure, the system achieves sufficient brightness with fewer LEDs, reducing device complexity
Solution Approach 2:
The reflective pyramid is divided into multiple reflective surfaces (first, second, third reflective surfaces) that segment the light path. This segmentation allows for optimized light redirection to different areas, improving overall illumination efficiency without increasing the number of LEDs required
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 enhances brightness and reduces heat output by focusing light more efficiently, allowing for fewer LEDs to be used while maintaining desired illumination levels, thus managing heat effectively.
Implementation Method 1
a plurality of reflective pyramids 258 arranged on the reflective film 257... the pyramids are arranged to reflect light emitted by the LEDs towards an optical film assembly
Data Source
AI summary
An exemplary illuminator assembly includes light emitting diode (LED) chips and reflective pyramids. The LED chips are arranged in an array and capable of emitting light. The reflective pyramids are arranged in an array complementary to the array of LED chips. Each LED chip is arranged among a plurality of the plurality of reflective pyramids, and each reflective pyramid is arranged among a plurality of the plurality of LED chips. The reflective pyramids include a plurality of reflective surfaces, and the reflective surfaces are inclined to the LED chips and thereby capable of reflecting at least some of the light beams emitted from the LED chips such that the reflected light beams propagate in directions that are closer to a direction normal to the arrays than the directions of said some of the light beams prior to their reflection.