Organic Light-Emitting Touch Display With Stacked Electrodes
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Solution Overview
Problem
Existing organic light-emitting touch display panels face issues with normal display being affected due to large touch electrodes covering pixels, leading to reduced aperture opening ratio and increased thickness, and complex manufacturing processes.
Innovation Solution
The touch-sensitive electrodes are disposed in the same layer with narrow touch sensor traces, reducing their impact on display signals and occupying less area, while being in different film layers to minimize touch blind spots and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large area touch electrodes are used for mutual-capacitance touch technology, then touch sensitivity is improved, but display quality deteriorates due to blocking of display signals and reduced aperture opening ratio
Solution Approach 1:
The patent transitions from planar touch electrode arrangements to a three-dimensional stacked configuration. The first and second touch electrodes are positioned at different heights (different z-dimension) above the display panel, allowing them to detect touch without blocking display signals in the same plane. This vertical separation resolves the conflict between touch sensitivity and display quality.
Solution Approach 2:
The touch sensing function is divided into two separate electrode layers (first touch electrode and second touch electrode) positioned at different heights. Each electrode can be independently optimized for its function, and their combined effect provides enhanced touch detection without requiring large overlapping areas that would block display signals.
2Area of stationary object
If large area touch electrodes are used to cover pixels, then touch detection coverage is improved, but aperture opening ratio decreases
Solution Approach 1:
By positioning touch electrodes at different vertical heights (separated by spacing structure), the patent achieves broad touch detection coverage without requiring large horizontal footprints. The electrodes can extend widely in the x-y plane at their respective heights without overlapping and blocking display pixels, thus maintaining high aperture opening ratio while ensuring comprehensive touch coverage.
3Reliability
If multiple film layers are added for touch functionality, then touch performance is improved, but panel thickness increases
Solution Approach 1:
The patent employs extremely thin film structures for the touch electrodes and spacing layers. The first and second touch electrodes are formed as thin conductive films separated by a thin spacing structure, enabling enhanced touch performance without significant thickness increase. The use of thin-film deposition techniques allows multiple functional layers to be integrated with minimal cumulative thickness.
4Illumination intensity
If touch electrodes are disposed in the same layer with narrow traces, then impact on display signals is reduced, but touch blind spots increase
Solution Approach 1:
The patent eliminates touch blind spots by utilizing the vertical dimension. The first and second touch electrodes are positioned at different heights, allowing them to detect touches across the entire display area without creating blind spots that would occur with narrow same-layer traces. The narrow trace width is maintained for display quality, while the stacked configuration ensures complete touch coverage.
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 configuration reduces the impact on display effect, minimizes touch blind spots, and decreases the panel thickness, while simplifying the manufacturing process and reducing costs.
Implementation Method 1
The display unit includes a first electrode, a second electrode, and an organic light-emitting layer disposed between the first electrode and the second electrode
Data Source
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AI summary
This application provides an organic light-emitting touch display panel and an organic light-emitting touch display apparatus, including a display layer (10), a touch layer (20), and a packaging layer (30) disposed between the display layer (10) and the touch layer (20), where the three layers are disposed along a thickness direction of the organic light-emitting touch display panel, and the touch layer (20) is disposed on the packaging layer (30). The display layer (10) includes a plurality of display units (11), and the display unit (11) includes a first electrode (111), a second electrode (112), and an organic light-emitting layer (113) disposed between the first electrode (111) and the second electrode (112). The touch layer (20) includes a touch-sensitive layer, a first insulation layer (23), and a touch wiring layer that are disposed in the thickness direction of the organic light-emitting touch display panel, and the first insulation layer (23) is disposed between the touch-sensitive layer and the touch wiring layer. The touch-sensitive layer includes a plurality of touch-sensitive electrodes (21) that are insulated from each other, the touch wiring layer includes a plurality of touch sensor traces (22), and the touch-sensitive electrodes (21) are electrically connected to at least one touch sensor trace (22). The organic light-emitting touch display panel reduces impact of the touch layer on a voltage signal of the display layer, reduces touch blind spots, and improves touch accuracy.