LED Display Touch Electrode Sharing for Simpler Panel Wiring
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Solution Overview
Problem
Existing display devices face challenges in integrating touch sensing capabilities with LED technology, requiring complex structures and separate components for touch units, which complicates manufacturing and reduces efficiency.
Innovation Solution
A display device design that integrates sub-pixels and touch units on the same layer, utilizing the same wiring lines for both functions, allowing for simplified structure and simultaneous or time-divisional driving of sub-pixels and touch units, with touch sensing transistors and electrodes embedded within the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components and complex structures are used for touch units in LED display devices, then touch sensing functionality is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the touch sensing function with the display structure by integrating touch sensing electrodes and control circuits into the existing display panel layers. The touch sensing electrode is formed in the same layer as the pixel electrode, and the touch sensing transistor shares the same substrate and interlayer structures as the display transistor, thereby achieving touch sensing capability while reducing overall device complexity
Solution Approach 2:
The patent implements multi-functionality by designing the pixel electrode to serve dual purposes: as the anode for the light-emitting diode and as the touch sensing electrode. Additionally, the interlayer insulating film and planarization layers serve both the display structure and the touch sensing structure, allowing a single component to perform multiple functions and reducing the need for separate touch unit components
2Reliability
If separate components are used for touch units, then touch sensing is achieved, but manufacturing efficiency decreases
Solution Approach 1:
The patent combines the manufacturing processes for display and touch components into a single integrated process. The touch sensing electrode is formed simultaneously with the pixel electrode using the same ITO layer deposition process, and the touch sensing transistor is fabricated using the same thin-film transistor processes as the display transistor, eliminating the need for separate manufacturing steps and improving production efficiency
Solution Approach 2:
The patent performs preliminary actions by forming the touch sensing electrode structure during the early stages of display panel fabrication, specifically forming the ITO layer that serves as both pixel electrode and touch sensing electrode before the display device is fully assembled. This preliminary integration of touch sensing structures into the display manufacturing process avoids additional manufacturing steps and improves overall productivity
3Device complexity
If assembly lines are used as touch sensing lines, then structure is simplified, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges the assembly line structure with the touch sensing line by using the same conductive layer and interlayer insulating film for both purposes. The assembly line that transports the light-emitting diode during manufacturing serves dual functionality as the touch sensing signal transmission line, thereby simplifying the overall structure while requiring precise alignment during the formation process
Solution Approach 2:
The patent implements multi-functionality by designing the assembly line to serve as both a mechanical transport structure during manufacturing and as an electrical touch sensing signal line during operation. This universal design reduces the number of separate components needed but requires high manufacturing precision to ensure proper electrical connections and signal transmission
4Device complexity
If wiring lines are shared for sub pixel driving and touch sensing, then structure is simplified, but signal interference may increase
Solution Approach 1:
The patent merges the wiring lines used for sub pixel driving with those used for touch sensing by using the same data lines and control lines for both display signal transmission and touch sensing signal transmission. This consolidation simplifies the wiring structure and reduces the number of separate conductors needed, though it requires careful signal timing management to prevent interference
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 design simplifies the touch unit structure, enhances touch sensing capabilities, and improves manufacturing efficiency by sharing components, while maintaining high luminance and reliability of LED displays.
Implementation Method 1
each includes a light emitting diode
Implementation Method 2
the pixel electrode and the touch electrode are disposed on the same layer. Accordingly, the pixel electrode and the touch electrode are disposed on the substrate to sense the touch by a self-capacitance manner
Data Source
AI summary
A display device can include a plurality of sub pixels disposed on a substrate and each of the plurality of sub pixels including a driving transistor, an adhesive layer disposed on the driving transistor, a light emitting diode disposed on the adhesive layer in each of the plurality of sub pixels, a planarization layer surrounding a side of the light emitting diode and exposing a portion of a second electrode on an upper surface of the light emitting diode, and a plurality of touch units on the substrate and including a touch electrode.