Micro LED Sub-Pixel Circuit Repair via Redundant Switching
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Solution Overview
Problem
Conventional post-process methods for repairing abnormal sub-pixels in micro LED display devices are difficult and not beneficial for mass production, as they require modifying fine sub-pixel circuits.
Innovation Solution
A sub-pixel circuit design for micro LED display devices that includes a switch unit, a selection driving unit, and a light-emitting unit with two micro LEDs, where the selection driving unit selects one micro LED to emit light based on a data signal, allowing for the repair of abnormal sub-pixels without modifying the sub-pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional post-process methods (laser cutting or establishing new connections) are used to repair abnormal sub-pixels, then the abnormal sub-pixels can be repaired, but the repair process becomes very difficult and not beneficial for mass production
Solution Approach 1:
The patent applies preliminary action by pre-configuring dual micro LED structures and associated switching circuits during the manufacturing process. Before any abnormality occurs, the system is designed with redundant components and control mechanisms that enable rapid switching to backup elements, eliminating the need for difficult post-process repairs and facilitating mass production.
Solution Approach 2:
The patent implements discarding and recovering by designing the system to discard (deactivate) abnormal micro LEDs through circuit switching, while recovering functionality by activating redundant or backup micro LEDs. This allows the system to maintain operation without physical modification, supporting efficient mass production.
2Reliability
If post-process modification methods are used to repair sub-pixel circuits, then abnormal sub-pixels can be fixed, but the repair difficulty increases due to the fine dimensions of micro LEDs and circuits
Solution Approach 1:
The patent applies segmentation by dividing each sub-pixel into multiple independent micro LED elements with separate control circuits. This segmentation allows individual elements to be controlled independently, enabling repair through circuit switching rather than physical modification of the fine micro LED structures themselves.
Solution Approach 2:
The patent uses switching circuits as intermediaries between the control system and micro LED elements. These intermediary components enable repair operations at the circuit level rather than requiring direct manipulation of the fine micro LED structures, significantly improving ease of repair.
3Adaptability or versatility
If dual micro LEDs are used in each sub-pixel with selection driving, then repair capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the dual micro LED structure and switching circuitry to serve multiple functions: normal display operation, abnormality detection, and repair switching. This multi-functionality reduces the need for separate repair mechanisms, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent implements dynamics through controllable switching between micro LED elements based on their operational status. The system dynamically adjusts which elements are active based on real-time performance, allowing adaptability for repair while maintaining a relatively simple static circuit structure.
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
Enables the repair of abnormal sub-pixels in micro LED display devices without the need for conventional post-process modifications, facilitating more efficient and cost-effective mass production.
Implementation Method 1
The light-emitting unit comprises two micro LEDs. The two micro LEDs are electrically connected to the selection driving unit individually. Each LED comprises a first end and a second end. The first ends of the micro LEDs are electrically connected to the selection driving unit, and the second ends of the micro LEDs are electrically connected to a second voltage. The selection driving unit selects one of the micro LEDs to emit light according to the data signal transmitted through the switch unit.
Data Source
AI summary
A micro light-emitting diode display device and a sub-pixel circuit thereof are provided. The sub-pixel circuit includes a switch unit, a selection driving unit and a light-emitting unit. The switch unit receives a data signal. The selection driving unit is electrically connected to the switch unit, and electrically connected to a first voltage. The light-emitting unit includes two micro light-emitting diodes, which are electrically connected to the selection driving unit. The first ends of the micro light-emitting diodes are connected to the selection driving unit. The second ends of the micro light-emitting diodes are electrically connected to a second voltage. The selection driving unit selects one of the micro light-emitting diodes to emit light according to the data signal transmitted through the switch unit.