AMOLED Touch Panel Capacitance Sensing for Pressure Detection
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Solution Overview
Problem
Active matrix organic light emitting diode (AMOLED) display panels struggle to accurately sense the pressure of touch actions applied on the touch screen, limiting their functionality as both output and input devices.
Innovation Solution
The self-luminescence display apparatus incorporates a touch circuit and force sensing capacitors, which utilize a patterned conductive layer and a supporting frame to calculate changes in capacitance and sense touch pressure, enabling accurate positioning and pressure detection of touch actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is incorporated into the AMOLED display panel to enable touch functionality, then the display can serve as both output and input device, but the pressure sensing accuracy is insufficient
Solution Approach 1:
The touch panel is divided into multiple sensing regions with different capacitance values, allowing differentiation between various touch pressures. The panel segments the sensing capability into multiple discrete capacitance levels that correspond to different pressure magnitudes, enabling accurate pressure measurement while maintaining full touch functionality.
Solution Approach 2:
The patent changes the capacitance parameter of the touch sensing elements by incorporating variable capacitance structures. Different regions or layers are designed with different capacitance values that change in response to applied pressure, enabling the system to distinguish between light and heavy touches while preserving the overall touch functionality of the display.
2Adaptability or versatility
If the AMOLED display panel is used as both output and input device, then functionality is enhanced, but pressure sensing accuracy deteriorates
Solution Approach 1:
The display panel is segmented into multiple sensing zones with distinct capacitance characteristics. This segmentation allows the dual-function display to accurately detect pressure levels by comparing capacitance changes across different regions, resolving the conflict between maintaining dual functionality and achieving precise pressure sensing.
Solution Approach 2:
The patent introduces an intermediary capacitance measurement mechanism that mediates between the touch input function and the pressure sensing requirement. By using capacitance as the intermediary parameter, the system can accurately measure pressure while the display continues to function as both output and input device.
3Ease of manufacture
If a simple touch panel structure is used to maintain thinness, then manufacturing is simplified, but pressure sensing capability is insufficient
Solution Approach 1:
The touch panel structure is designed to perform multiple functions simultaneously - basic touch detection, pressure sensing, and position identification - using a single integrated capacitive sensing layer. This multi-functional design maintains manufacturing simplicity while achieving accurate pressure sensing capability through the use of variable capacitance regions.
Solution Approach 2:
The patent achieves enhanced pressure sensing capability without complicating manufacturing by changing the capacitance parameter of existing touch sensing elements. Different capacitance values are implemented through material or structural modifications that can be integrated into the existing AMOLED manufacturing process, maintaining ease of manufacture while improving pressure detection accuracy.
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
The apparatus effectively senses both the position and pressure of touch actions, enhancing the touch functionality of AMOLED display panels by accurately processing capacitance differences to determine touch pressure.
Implementation Method 1
a force sensing capacitor, which utilizes a patterned conductive layer and a supporting frame to calculate changes in capacitance and sense touch pressure
Data Source
AI summary
A self-luminescence display apparatus capable of detecting pressure of touches applied by a user, the apparatus includes a display panel having a plurality of conductive layers and a supporting frame. One of the conductive layers cooperates with the supporting frame to form a plurality of force sensing capacitors. When a touch is applied, the display panel deforms according to pressure applied, which cause the capacitances of the force sensing capacitors to alter. The change in capacitance value, corresponding to a position where the touch operation is applied, can be calculated.