Micro Lens LED Display Panel for Light Collimation and Crosstalk Reduction
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Solution Overview
Problem
Conventional projection systems using passive imager devices like LCDs and DMDs suffer from low efficiency due to the loss of light not transmitted or reflected, requiring complex illumination optics and resulting in reduced brightness and increased power consumption, while LED displays face issues with light divergence leading to crosstalk and loss of contrast.
Innovation Solution
A monolithically integrated LED display panel with a substrate, pixel driver circuits, an array of LED dies, and a micro lens array that collimates light, combining the light source and image forming functions into a single device to reduce light divergence and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional passive imager devices (LCD, DMD) are used for projection displays, then image formation is achieved through optical modulation, but light efficiency is reduced due to loss of non-transmitted/reflected light and complex illumination optics are required
Solution Approach 1:
The patent combines the light source (LED) and the imager device into a single integrated LED display panel where each pixel is a self-emissive LED die. This eliminates the need for separate illumination optics and removes light loss associated with passive modulation, as each LED pixel generates its own light directly at the pixel location.
2Illumination intensity
If LED dies are used as self-emissive imager devices, then light emission is achieved at each pixel, but light divergence causes large divergence angles resulting in scattered light and crosstalk between pixels
Solution Approach 1:
The patent introduces a micro lens array as an intermediary component positioned between the LED dies and the viewer. Each micro lens corresponds to a specific LED die and collimates the divergent light emitted by that LED, directing it in a controlled direction. This mediator prevents light from scattering into adjacent pixel areas, thereby eliminating crosstalk while preserving the high light emission intensity of the LED dies.
3Ease of manufacture
If LED dies emit light with large divergence angles, then spontaneous emission is achieved, but light scattering and reflection increase causing loss of sharpness and contrast
Solution Approach 1:
The micro lens array serves as an intermediary optical element that collimates the spontaneously emitted light from each LED die. By positioning a micro lens directly over each LED die, the system maintains the manufacturing simplicity of spontaneous emission while the micro lens optically corrects the large divergence angle, directing light in a narrow beam that preserves image sharpness and contrast.
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 improves light utilization and reduces power consumption by collimating light within the LED display panel, minimizing crosstalk and maintaining image sharpness and contrast.
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.