Organic Electroluminescent Touch Panel Cathode Partitioning
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Solution Overview
Problem
The integration of touch control function into organic electroluminescent display panels is challenging due to uneven threshold voltage in pixel circuits and parasitic capacitance in touch electrodes, affecting display brightness and touch control performance.
Innovation Solution
An organic electroluminescent touch panel with a partitioned cathode layer serving as touch electrodes, connected via a lead wire to a touch display integrated chip, incorporates a pixel driving circuit with initialization, charging, compensation, and light-emitting control modules to initialize nodes, perform threshold voltage compensation, and drive light emission, while the partitioned cathodes sense external touches and transmit signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic electroluminescent materials are used, then device stability and lifespan are improved, but flexibility and bending capability deteriorate
Solution Approach 1:
The patent changes the material parameter from inorganic to organic electroluminescent materials, which fundamentally alters the material properties to achieve both flexibility and acceptable device stability. The organic materials allow the display to be bent while maintaining operational reliability through proper material selection and device结构设计.
Solution Approach 2:
The patent employs composite material structures including multiple organic layers (hole injection layer, hole transport layer, emission layer, electron transport layer, electron injection layer) combined with flexible substrates and electrode materials. This composite approach enables the device to achieve both flexibility and stability by combining materials with complementary properties.
2Duration of action of stationary object
If inorganic electroluminescent materials are used, then device lifespan is improved, but weight and complexity increase
Solution Approach 1:
The patent changes from inorganic to organic electroluminescent materials, reducing device complexity and weight while achieving acceptable lifespan through optimized organic material combinations and device architecture. The organic materials enable simpler manufacturing processes and lighter device construction.
Solution Approach 2:
The patent replaces complex inorganic material systems with organic material systems that offer simpler processing and device structures. The organic electroluminescent devices can be manufactured using solution-based techniques, reducing manufacturing complexity compared to vacuum deposition required for inorganic materials.
3Adaptability or versatility
If organic electroluminescent materials are used, then flexibility is improved, but device stability and lifespan deteriorate
Solution Approach 1:
The patent uses a composite structure with multiple organic layers, each performing specific functions (hole injection, hole transport, emission, electron transport, electron injection). This layered composite approach maintains device stability while preserving flexibility by optimizing each layer's material properties and thickness.
Solution Approach 2:
The patent applies local quality optimization by selecting specific organic materials for each functional layer based on their local requirements. For example, the emission layer uses materials optimized for light emission, while transport layers use materials optimized for charge carrier transport, achieving overall device stability through localized material optimization.
4Device complexity
If organic electroluminescent materials are used, then weight and complexity are reduced, but device lifespan deteriorates
Solution Approach 1:
The patent employs composite organic material structures with multiple functional layers, each contributing to overall device performance and lifespan. The combination of different organic materials with complementary properties achieves extended operational life while maintaining low device complexity and simple manufacturing processes.
Solution Approach 2:
The patent optimizes material parameters such as HOMO/LUMO energy levels, mobility, and stability of organic materials to extend device lifespan. By carefully selecting and optimizing these parameters, the patent achieves longer operational life for organic electroluminescent devices without increasing complexity.
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 solution improves the evenness of light emission, enhances display image quality, and reduces parasitic capacitance, thereby improving touch control performance without altering the original organic electroluminescent architecture.
Implementation Method 1
a third organic layer which is an organic electroluminescent layer and emits light
Data Source
Figure 1a~1c
Figure 2~3
Figure 4
AI summary
This application provides an organic electroluminescent touch panel, a driving method for the same, and a display device comprising the same. Without changing the original organic electroluminescent architecture, the cathode layer (2) of the organic electroluminescent architecture is partitioned to form a plurality of cathodes independent of and insulating from each other, the plurality of cathodes serve as touch electrodes to sense occurrence of an outside touch and transmit a touch signal to the touch display integrated chip via the lead wire, implementing that the display panel is integrated with the touch control function based on organic electroluminescent display, and by the pixel driving circuit, the control terminal of the driving module (04) is initialized in the initialization stage, threshold voltage compensation of the driving module (04) is performed in the compensation stage, which avoids an affect caused by change of the threshold voltage of the driving module (04) on lightening luminance, meanwhile, in the touch control stage, signals on the respective signal lines are all modulated in synchronization with external touch control signals sensed by the touch electrodes, the parasitic capacitance of the touch electrode can be eliminated, and touch control performance of the touch panel can be improved.