Passive Matrix OLED Display Module Touch Integration
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Solution Overview
Problem
Existing portable electronic devices with passive matrix organic light emitting diode display modules face challenges in reducing volume and thickness while incorporating touch functionality without additional touch sensing circuits in the display area, which complicates production and decreases yield.
Innovation Solution
A thin-type display module with touch function using a passive matrix organic light emitting diode display device and auxiliary sensing electrodes, where either the first or second pixel electrode layer serves as the first sensing electrode, and two second sensing electrodes are placed in non-display areas, allowing a control chip to read capacitance variations for outputting one-dimensional or two-dimensional touch signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensing layer is added on the substrate or cover of the display panel, then the touch function is achieved, but the whole volume or thickness of the display module increases
Solution Approach 1:
The patent merges the display function and touch sensing function into a single integrated structure. The pixel electrode layers of the passive matrix organic light emitting diode display device serve dual purposes: displaying images and sensing touch. By combining these functions into the existing display structure rather than adding separate layers, the touch capability is achieved without increasing the overall thickness of the display module.
Solution Approach 2:
The pixel electrode layers are designed to perform multiple functions simultaneously. They serve as both the display electrode for emitting light and as the sensing electrode for detecting touch input. This multi-functional design eliminates the need for dedicated touch sensing layers, thereby maintaining the original thickness while adding touch functionality.
2Adaptability or versatility
If additional touch sensing circuits are added in the display area, then the touch function is achieved, but the complexity of production increases and yield rate decreases
Solution Approach 1:
The patent combines the touch sensing circuit functionality with the existing display control circuitry. The same control chip that drives the display also processes touch sensing signals, and the pixel electrode layers serve both display and sensing purposes. This integration eliminates the need for separate touch sensing circuits in the display area, reducing production complexity and improving yield rate.
Solution Approach 2:
The control chip is designed to perform dual functions: controlling the display output and processing touch sensing input. By making the control system universal and capable of handling both display and touch functions, the patent avoids adding separate dedicated touch circuits, thereby simplifying the overall device structure and reducing manufacturing complexity.
3Adaptability or versatility
If additional touch sensing circuits are added in the display area, then the touch function is achieved, but the yield rate of the display module decreases
Solution Approach 1:
The patent merges touch sensing functionality into the existing display structure and control system. By using the pixel electrode layers for both display and sensing, and the control chip for both display control and touch processing, the patent eliminates additional circuitry that would complicate manufacturing and reduce yield rates.
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 enables the detection and output of touch signals without additional touch sensing circuits in the display area, reducing module thickness and complexity, making it suitable for various portable devices while maintaining display functionality.
Implementation Method 1
the first sensing electrode and the two second sensing electrodes are self-capacitance sensing electrodes, and the control chip is used to read the variation of the capacitance of the first sensing electrode and the second sensing electrodes to output the touch signal
Implementation Method 2
a display area having a passive matrix organic light emitting diode display device, wherein the passive matrix organic light emitting diode display device includes a first pixel electrode layer, a second pixel electrode layer and an organic light emitting material layer disposed between the first pixel electrode layer and the second pixel electrode layer
Data Source
AI summary
The present invention provides a display module with touch function, including: a touch display panel and a control chip. The touch display panel contains a display area and non-display area around the display area. The display area contains a first sensing electrode constituted by a pixel electrode layer. The non-display area contains two second sensing electrodes. The control chip electrically connects with the first sensing electrode and the two second sensing electrodes separately through wires. The first sensing electrode and the second sensing electrode are self-capacitance sensing electrode. The control chip is used to read the self-capacitance variation of the first sensing electrode and the two second sensing electrodes for outputting a touch signal.