Micro LED Display Panel Multiplexed Touch Electrodes
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Solution Overview
Problem
Conventional micro LED display panels lack in-cell touch sensing electrodes, limiting their functionality.
Innovation Solution
Incorporating transparent conductive units as both cathodes and touch electrodes, multiplexed to function as either anodes or cathodes of micro LEDs, allowing for both display and touch functionality through a control circuit layer that applies voltage signals and processes capacitive sensing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional micro LED display panel structure is used without in-cell touch sensing electrodes, then the manufacturing process is simpler, but the functionality is limited and touch sensing capability is absent
Solution Approach 1:
The transparent conductive layer is designed to serve dual functions: as the cathode for micro LED emission and as the in-cell touch sensing electrode. This multi-functional design enables the display panel to provide both display and touch sensing capabilities without adding separate structural layers, thereby improving versatility while controlling device complexity
Solution Approach 2:
The patent merges the cathode function and touch electrode function into a single transparent conductive layer. By combining these two previously separate functions into one component, the panel achieves touch sensing capability without proportionally increasing structural complexity, as the same physical layer performs both roles
2Measurement precision
If transparent conductive units are multiplexed as both cathodes and touch electrodes, then touch sensing accuracy is improved, but the electrical design complexity increases
Solution Approach 1:
The control circuit layer implements periodic multiplexing by alternately applying first voltage signals for display operation and second voltage signals for touch sensing operation. This time-division multiplexing approach enables accurate touch detection while managing electrical design complexity through systematic signal switching rather than requiring permanently separate electrode structures
Solution Approach 2:
The transparent conductive units dynamically switch between two functional states: serving as cathodes during display mode and serving as touch electrodes during sensing mode. This dynamic reconfiguration allows the system to achieve high touch detection precision while the control circuit manages the complexity of switching between different operational modes
3Device complexity
If the same transparent conductive units are used for both display and touch functions, then device complexity is reduced, but signal interference between display and touch signals may occur
Solution Approach 1:
The control circuit layer employs periodic time-division multiplexing to alternately activate display signals and touch sensing signals. By applying first voltage signals for display and second voltage signals for touch sensing at different time intervals, the system reduces signal interference while maintaining the benefit of using a single transparent conductive layer for both functions
Solution Approach 2:
The multiplexing scheme ensures continuous useful action by rapidly switching between display and touch sensing operations. The quick alternation between first and second voltage signals maintains both display continuity and touch responsiveness while minimizing interference, as the switching occurs faster than the human perception threshold
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 accurate touch point detection and improved sensitivity by utilizing transparent conductive units as multiplexed touch electrodes, enhancing the display panel's capability to perform both display and touch functions effectively.
Implementation Method 1
a micro LED layer (30) on the first metal layer (40), the transparent conductive layer (20) on a side of the micro LED layer (30) opposite from the first metal layer (40)... the micro LED layer (30) includes a plurality of micro LEDs (31) spaced apart from each other
Implementation Method 2
the transparent conductive units (211) serve as anodes or cathodes of the micro LEDs (31) and are multiplexed as touch electrodes... processes capacitive sensing signals
Data Source
AI summary
A micro LED display panel includes a first metal layer, a micro LED layer on the first metal layer, and a transparent conductive layer on a side of the micro LED layer opposite from the first metal layer. The micro LED layer includes a plurality of micro LEDs spaced apart from each other. The first metal layer includes a plurality of first metal units spaced apart from each other. The plurality of first metal units serve as anodes or cathodes of the plurality of micro LEDs. The transparent conductive layer includes a plurality of transparent conductive units spaced apart from each other. The plurality of transparent conductive units serve as anodes or cathodes of the plurality of micro LEDs and are multiplexed as touch electrodes. The micro LED display panel of the present disclosure has both a display function and a touch function.