Micro-Pixel Controller ESD Protection for Micro-LED Display Modules
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Solution Overview
Problem
Existing display technologies, such as liquid crystal displays, are complex in structure and limited in thickness, contrast ratio, brightness, and viewing angle due to the requirement of a backlight unit and liquid crystal layer, whereas emissive displays like micro-LEDs offer better performance but face challenges in circuit testing and manufacturing due to the integration of inorganic light-emitting devices.
Innovation Solution
A display module and apparatus with a micro-pixel controller that separates the drive circuits for inorganic light-emitting devices, incorporating ESD protection circuits and a modular design to facilitate easier testing and replacement, allowing for a more efficient manufacturing process and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic light-emitting devices are integrated directly into the display panel, then brightness and lifespan are improved, but circuit testing and manufacturing complexity increase
Solution Approach 1:
The display module is divided into separate functional components: pixel circuits are integrated with the inorganic light-emitting devices on the substrate, while ESD protection circuits are implemented as separate dedicated circuits. This segmentation allows independent testing and manufacturing of different modules, reducing overall complexity while maintaining the high brightness and lifespan benefits of inorganic LEDs.
Solution Approach 2:
ESD protection circuits are introduced as intermediary components between external signal sources and the pixel circuits containing inorganic light-emitting devices. These protection circuits prevent electrostatic damage to the delicate inorganic LEDs during manufacturing and operation, enabling reliable testing and manufacturing processes while preserving the high performance of the light-emitting devices.
2Reliability
If ESD protection circuits are added to protect inorganic light-emitting devices, then reliability is improved, but device complexity increases
Solution Approach 1:
The ESD protection circuits are designed with multi-functionality to serve multiple purposes: protecting against electrostatic discharge during manufacturing, protecting during normal operation, and enabling safe circuit testing. By consolidating these functions into dedicated protection circuits rather than adding separate mechanisms for each function, the overall complexity is minimized while reliability is maximized.
3Illumination intensity
If micro-LED technology is used, then contrast ratio and energy efficiency are improved, but manufacturing difficulty increases
Solution Approach 1:
The manufacturing process is segmented into distinct stages: fabricating pixel circuits with inorganic light-emitting devices on a substrate, separately implementing ESD protection circuits, and then integrating these modules. This segmentation enables specialized manufacturing techniques for each component and simplifies quality control, making micro-LED production more feasible while maintaining excellent contrast ratio.
Solution Approach 2:
ESD protection circuits serve as intermediary components that facilitate the manufacturing process by protecting the sensitive micro-LEDs during handling, testing, and assembly. This protection enables easier manufacturing by preventing damage during these critical processes, while the micro-LEDs maintain their superior contrast ratio performance.
Data Source
AI summary
A display module and a display apparatus including the same are provided. The display module includes a module substrate; pixels provided on the module substrate; and a micro-pixel controller configured to supply drive currents to the pixels. The micro-pixel controller includes: a first input pad for receiving a power voltage; a second input pad for receiving a data voltage; pixel circuits configured to output the drive currents to the pixels; a control circuit configured to distribute the power voltage and the data voltage to the pixel circuits; a first ESD protection circuit connected to the first input pad and the control circuit through a first voltage line and configured to transmit the power voltage to the control circuit; and a second ESD protection circuit connected to the second input pad and the control circuit through a second voltage line and configured to transmit the data voltage to the control circuit.