Micro LED Sub-Pixel Structure with Dual-Electrode Separation
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Solution Overview
Problem
Traditional micro light-emitting diodes (Micro LED) suffer from rapid decay and inconsistent brightness due to material degradation and threshold voltage drift, leading to uneven displays and afterimages, especially at low grayscales, where the variability of thin film transistors affects the display effect.
Innovation Solution
A sub-pixel structure utilizing dual-electrode separation with a driving module, selection modules, and switch modules to control conduction between light-emitting elements, allowing for time-sharing and zone control, which slows down material decay and prolongs the service life by intermittently operating the light-emitting elements and maintaining stable potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional micro LED is controlled by continuous current, then brightness control is simple, but material decays rapidly and service life decreases
Solution Approach 1:
The patent implements time-sharing control by periodically switching between first and second light-emitting elements within each frame period. The first selection module and second selection module alternately activate different light-emitting elements based on time division multiplexing, allowing each element to operate intermittently rather than continuously, thereby reducing cumulative degradation and extending service life while maintaining brightness control capability
Solution Approach 2:
The patent divides the light-emitting elements into two separate groups (first light-emitting element and second light-emitting element) with separate control pathways. The first selection module controls the first light-emitting element while the second selection module controls the second light-emitting element, enabling independent operation and time-sharing activation that reduces overall material decay rate
2Adaptability or versatility
If different RGB organic materials are used in micro LED, then display color range is improved, but decay rates differ and brightness consistency deteriorates
Solution Approach 1:
The patent segments the display into multiple sub-pixels, with each sub-pixel containing either a first light-emitting element or a second light-emitting element. By controlling these segmented elements through separate selection modules and switch modules, the system can compensate for material decay differences and maintain brightness consistency across different RGB materials while preserving broad color display capability
Solution Approach 2:
The patent dynamically adjusts control parameters (control signals to selection modules and switch modules) to compensate for decay rate differences between different RGB organic materials. By changing the timing and duration of activation for different light-emitting elements, the system maintains brightness consistency despite using materials with inherently different decay characteristics
3Ease of manufacture
If thin film transistor variability is present, then manufacturing is easier, but display uniformity deteriorates especially at low grayscales
Solution Approach 1:
The patent implements a feedback mechanism where the switch module monitors and adjusts the activation state of light-emitting elements based on control signals from the selection modules. This feedback control compensates for thin film transistor variability by dynamically adjusting which elements are active, ensuring uniform display output across different grayscales while maintaining ease of manufacturing
Solution Approach 2:
The patent uses periodic switching between different light-emitting elements to average out the effects of thin film transistor variability. By time-sharing the activation of multiple elements with slightly different characteristics, the system achieves improved display uniformity at low grayscales while maintaining simple manufacturing processes
4Object-affected harmful factors
If static image is displayed for long period, then image retention is reduced, but material decay increases and afterimage forms
Solution Approach 1:
The patent implements periodic switching between first and second light-emitting elements even when displaying static images. The time-sharing control ensures that no single element remains continuously active, allowing periodic rest periods that prevent cumulative material decay and reduce afterimage formation while maintaining the displayed image, thereby extending service life without sacrificing image retention
Data Source
AI summary
A sub-pixel array and a display are provided. The sub-pixel structure includes a driving module, a first selection module, a second selection module, a switch module, a first light-emitting element, and a second light-emitting element. The first selection module is configured to control conduction between the driving module and an anode of the first light-emitting element or conduction between the driving module and an anode of the second light-emitting element through a first control signal. The second selection module is configured to control grounding of a cathode of the first light-emitting element or grounding of a cathode of the second light-emitting element through a second control signal.