Dynamic Touch Resolution Adjustment on AMOLED Displays
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Solution Overview
Problem
Touch resolutions on active-matrix organic light-emitting diode (AMOLED) displays are fixed, limiting the dynamic adjustment of touch zones for effective touch detection.
Innovation Solution
A method to dynamically adjust touch resolution by a controller, creating multiple capacitive touch zones on an AMOLED display by measuring voltage changes across light emitting devices and adjusting programming current or voltage, allowing for real-time changes in touch zone sizes as images are displayed, enabling detection of various touch inputs such as fingers and styluses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch resolution is fixed in predetermined zones, then manufacturing and circuit design are simplified, but adaptability to different touch input types is reduced
Solution Approach 1:
The patent implements dynamic touch resolution adjustment by allowing the controller to change the number and size of touch zones based on detected input characteristics. The system transitions from static predetermined zones to dynamically reconfigurable zones, enabling adaptation between finger touches (larger zones) and stylus inputs (smaller zones) without requiring multiple fixed circuit configurations
Solution Approach 2:
The system changes the parameter of touch zone dimensions and quantity based on detected touch characteristics. The controller adjusts touch resolution parameters in real-time, modifying the capacitive touch zone configuration from a fixed state to a variable state that responds to different input types, thereby achieving versatility without permanent circuit modifications
2Measurement precision
If touch zones are subdivided in a fixed manner, then device complexity is reduced, but measurement precision for different touch types deteriorates
Solution Approach 1:
The touch monitoring system dynamically adjusts zone subdivision based on detected input characteristics. When a stylus is detected, the system transitions to a higher resolution configuration with more, smaller zones. When a finger is detected, it uses fewer, larger zones. This dynamic reconfiguration achieves high measurement precision for different touch types without requiring permanently complex circuitry for all possible resolutions
Solution Approach 2:
The system applies different touch zone configurations to different regions or conditions locally. Instead of using a single fixed subdivision for the entire display, the controller creates customized touch zone patterns appropriate for the detected input type, optimizing measurement precision locally for each touch scenario without globally complicating the device architecture
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
Enables flexible and adaptive touch detection with the ability to adjust touch resolution on-the-fly, improving the accuracy and versatility of touch input recognition on AMOLED displays.
Implementation Method 1
a video display having a plurality of pixel circuits each including a light emitting device driven by a programming current or voltage representing a desired brightness produced by the light emitting device
Implementation Method 2
defining, by a controller, a first touch resolution of the video display to create a first plurality of capacitive touch zones... detecting a first touch on the transparent substrate in one of the first touch zones by measuring a voltage across an anode and a cathode
Data Source
AI summary
Dynamically adjusting a touch resolution of a display having pixel circuits each including an OLED driven by a driving transistor according to programming information representing a desired brightness for each OLED. A first touch resolution of the display is defined to create first touch zones relative to the display as images are being displayed thereon. A first touch in one of the first touch zones is detected by measuring a voltage across an anode and a cathode of each of a first set of OLEDs in the first touch zone. The first touch resolution is dynamically changed to a different second touch resolution to create second touch zones as further images are being displayed. A second touch in one of the second touch zones is detected by measuring a voltage across an anode and a cathode of each of a second set of OLEDs in the second touch zone.