Semi-simultaneous Driving for Polychromic MicroLED Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED array technologies face challenges in efficiently controlling and driving multi-junction polychromic devices, particularly in achieving simultaneous and sequential control of microLEDs to produce desired colors and improve image display quality.
Innovation Solution
The implementation of a semi-simultaneous driving scheme for polychromic matrices, which combines simultaneous and sequential driving techniques to reduce complexity and enhance speed and resolution, while using a two-stage pixel addressing approach to optimize microLED control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fully simultaneous RGB driving is used, then color mixing quality is improved, but device complexity and wiring requirements increase
Solution Approach 1:
The patent segments the driving process into two distinct stages: a first stage driving a first subset of junctions and a second stage driving a second subset of junctions. This temporal segmentation allows color mixing to be achieved through sequential activation rather than simultaneous connection, reducing wiring complexity while maintaining color quality.
Solution Approach 2:
The patent implements periodic action by cycling through different driving stages in a repeating sequence. The first subset and second subset of junctions are activated in alternating periods, creating a temporal pattern that achieves full-color output over time while using fewer simultaneous connections than fully simultaneous driving.
2Device complexity
If sequential driving approach is used, then wiring complexity is reduced, but scanning speed decreases
Solution Approach 1:
The patent applies dynamics by making the driving approach adaptive rather than purely sequential. The system dynamically switches between driving the first subset and second subset of junctions in overlapping stages, optimizing the balance between wiring simplicity and scanning speed based on the temporal multiplexing of driving signals.
Solution Approach 2:
The patent ensures continuity of useful action by overlapping the first and second driving stages in time. Rather than completing all first-subset junctions before activating second-subset junctions, the system maintains continuous light output by transitioning between subsets, thereby improving scanning speed while keeping wiring simple.
3Manufacturing precision
If more junctions are driven simultaneously, then color accuracy is improved, but panel load and power consumption increase
Solution Approach 1:
The patent applies local quality by driving different subsets of junctions with different characteristics at different times. The first subset and second subset are selected to have complementary color properties, allowing each subset to be optimized for its specific driving conditions while collectively achieving full color accuracy across both stages.
Solution Approach 2:
The patent changes operational parameters by adjusting which specific junctions are active in each stage. By varying the subset composition and driving timing parameters, the system achieves color accuracy equivalent to or better than simultaneous driving while reducing the instantaneous panel load and power consumption at any given moment.
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
This approach allows for efficient color mixing and improved image display quality by reducing the complexity of wiring and panel load, while enabling faster panel scanning and potentially increasing the color gamut.
Implementation Method 1
A first junction (microLED) may be driven by supplying a current to a first terminal (R+) of the polychromic device... A second junction (microLED) may be driven by supplying a current to a second terminal (G+) of the polychromic device... A third junction (microLED) may be driven by supplying a current to a third terminal (B+) of the polychromic device
Data Source
AI summary
A lighting system and method of driving the array are disclosed. The array includes vertically-stacked polychromic devices having junctions that emit light of different colors. The junctions of each polychromic device along a particular row or column of the array are driven by simultaneously driving multiple separated junctions during one stage of a driving cycle and driving one or more junctions between the separated junctions during another stage of the driving cycle. The polychromic devices are driven by interleaving driving of the rows and columns of the array or by driving all of one of the rows or columns first and then driving all of the other of the rows or columns.