LED Display Panel Micro Lens Array for Pixel Light Collimation
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Solution Overview
Problem
Conventional projection systems using LED displays suffer from low efficiency due to the large divergence angle of LED dies, leading to light scattering, crosstalk between pixels, loss of sharpness, and contrast, as well as the need for bulky and optically lossy illumination optics.
Innovation Solution
A monolithically integrated LED display panel with a substrate, pixel driver circuits, LED dies, and a micro lens array that collimates light, combining the light source, image forming, and beam collimation functions into a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LED dies are used as self-emissive imager devices, then the display can be more compact and efficient, but the large divergence angle of LED light causes light scattering and crosstalk between pixels
Solution Approach 1:
A micro lens array is introduced as an intermediary component between the LED dies and the output. Each micro lens corresponds to a specific LED die and focuses its divergent light into a controlled beam, preventing light scattering and crosstalk while maintaining the compact self-emissive structure
Solution Approach 2:
The micro lens array divides the optical space into discrete segments, with each micro lens handling light from a specific LED die. This segmentation ensures that light from one pixel does not interfere with adjacent pixels, eliminating crosstalk while preserving the compact design
2Illumination intensity
If conventional illumination optics are used to collect divergent LED light, then light can be collimated, but the system becomes bulky and optically lossy
Solution Approach 1:
The patent extracts the collimation function from the conventional illumination optics and integrates it directly onto the LED die surface through a micro lens array. This eliminates the need for separate, bulky illumination optics while achieving the same light collimation effect
Solution Approach 2:
The micro lens array merges the light source (LED die) and the beam shaping function (collimation) into a single integrated structure. This combination removes the need for additional optical components, reducing system size and optical losses while maintaining effective light collimation
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 reduces light divergence, enhances brightness, and minimizes power consumption by effectively collecting and directing light, improving image quality and efficiency.
Implementation Method 1
a micro lens array including a plurality of micro lenses each corresponding to and being arranged over at least one of the LED dies
Data Source
AI summary
A light-emitting diode (LED) display panel includes a substrate, a driver circuit array on the substrate and including a plurality of pixel driver circuits arranged in an array, an LED array including a plurality of LED dies each being coupled to one of the pixel driver circuits, a micro lens array including a plurality of micro lenses each corresponding to and being arranged over at least one of the LED dies, and an optical spacer formed between the LED array and the micro lens array.