Micro Lens Array for High-Efficiency LED Displays
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Summary
Problems
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 solutions
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.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If LED dies are used as self-emissive imager devices, then the display can be more efficient and compact, but the light emitted has large divergence angle causing crosstalk and reduced contrast
Why choose this principle:
A micro lens array is introduced as an intermediary component between the LED dies and the viewer. Each micro lens corresponds to one or more LED dies and collimates the emitted light, converting the large divergence angle into a focused beam. This mediator resolves the contradiction by maintaining the efficiency benefits of LED self-emission while eliminating the harmful light scattering that causes crosstalk and contrast reduction.
Principle concept:
If LED dies are used as self-emissive imager devices, then the display can be more efficient and compact, but the light emitted has large divergence angle causing crosstalk and reduced contrast
Why choose this principle:
The optical parameters of the light emission are changed by introducing the micro lens array. The lens array modifies the divergence angle parameter of the light emitted by LED dies, transforming it from a wide spread to a focused direction. This parameter change allows the system to maintain high efficiency while reducing crosstalk between adjacent pixels.
Application Domain
Data Source
AI summary:
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.
Abstract
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.