Force Touch Structure Using Phosphorescence Intensity Detection
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Solution Overview
Problem
Prior art force touch technologies struggle to accurately identify multiple force levels, especially on larger displays, as they rely on gravity sensing devices that are easier to implement on small-size devices like watches, limiting the complexity of force sensing on larger surfaces.
Innovation Solution
A force touch structure comprising a base substrate with a light sensing device and a phosphorescence-emitting structure, where the phosphorescence-emitting structure includes a first and second electrode, a phosphorescent layer, and a flexible material layer, forming a capacitor with constant voltage signals, allowing the light sensing device to detect force touch by comparing the intensity of emitted phosphorescence with ambient light intensity, enabling accurate force identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gravity sensing devices are installed at four corners of a large-size display, then force sensing capability is achieved, but the device complexity and difficulty of implementation increase significantly
Solution Approach 1:
The patent replaces the mechanical gravity sensing device with an optical detection system. A phosphorescent layer is excited by a light source, and when pressure is applied, the phosphorescence intensity changes. This optical change is detected by a photosensitive sensor, converting mechanical force measurement into an optical measurement problem, thereby avoiding the complexity of installing multiple gravity sensors.
Solution Approach 2:
The patent changes the measurement parameter from gravitational acceleration (used by gravity sensors) to phosphorescence intensity. By applying pressure to the phosphorescent layer, the phosphorescence intensity varies with the applied force, providing a different physical basis for force measurement that is more suitable for large-size displays.
2Device complexity
If only three force levels are identified, then the system remains simple, but the force identification capability is limited
Solution Approach 1:
The patent implements a feedback mechanism where the photosensitive sensor continuously detects phosphorescence intensity changes and converts them into electrical signals. The control circuit processes these signals and provides feedback to determine the magnitude of applied pressure. This feedback loop enables continuous force measurement with high precision, allowing for multiple force levels to be identified beyond just three categories.
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 enhances the ability to detect multiple force levels by increasing capacitance and phosphorescence intensity with external force, providing accurate force touch detection beyond the limitations of prior art, enabling more complex force identification functions on larger displays.
Implementation Method 1
a phosphorescence-emitting structure positionally corresponding to the light sensing device. The phosphorescence-emitting structure comprises a first electrode, a second electrode, a phosphorescent layer located between the first electrode and the second electrode
Implementation Method 2
the first electrode and the second electrode are used for forming a capacitor with a constant voltage value under the effects of the first voltage signal and the second voltage signal
Data Source
AI summary
The present disclosure proposes a force touch structure, a touch display panel and a display apparatus. The force touch structure comprises a base substrate, a light sensing device located on the base substrate, and a phosphorescence-emitting structure positionally corresponding to the light sensing device. The phosphorescence-emitting structure comprises a first electrode, a second electrode, a phosphorescent layer, and a flexible material layer. The first electrode receives a first voltage signal, the second electrode receives a second voltage signal, and the first electrode and the second electrode are used for forming a capacitor with a constant voltage value under the effects of the first voltage signal and the second voltage signal. The light sensing device is used for receiving phosphorescence emitted by the phosphorescent layer and comparing an intensity of the received phosphorescence with a light intensity detected without force touch to determine the magnitude of force touch.