Large-Display Touch Sensor Segmentation for Faster, Lower-Power Sensing
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Solution Overview
Problem
As display apparatuses increase in size, the RC load on touch sensors grows, leading to increased sensing time and power consumption.
Innovation Solution
A display apparatus is designed with a first and second touch sensor, each having driving and sensing electrodes, and integrated circuits that switch between sensing modes to optimize touch detection, including variations in mutual and self-capacitance, reducing sensing time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the touch sensor size increases to cover larger display areas, then the sensing coverage area increases, but the RC load increases leading to longer sensing time and higher power consumption
Solution Approach 1:
The touch sensor is divided into multiple regions (first region, second region, third region) with different sensing modes applied to each. The first region uses both mutual and self-capacitance sensing, the second region uses only self-capacitance sensing, and the third region uses only mutual capacitance sensing. This segmentation allows the system to maintain accurate touch detection across the entire large area while reducing the overall RC load and sensing time compared to uniform sensing across the whole area.
2Area of stationary object
If the touch sensor size increases to cover larger display areas, then the sensing coverage area increases, but the power consumption increases due to higher RC load
Solution Approach 1:
The touch sensor is divided into multiple regions (first region, second region, third region) with different sensing modes applied to each. The first region uses both mutual and self-capacitance sensing, the second region uses only self-capacitance sensing, and the third region uses only mutual capacitance sensing. This segmentation allows the system to maintain accurate touch detection across the entire large area while reducing the overall RC load and sensing time compared to uniform sensing across the whole area.
Solution Approach 2:
Instead of applying full mutual capacitance sensing across the entire large touch sensor area (which would be excessive and consume high power), the patent applies mutual capacitance sensing only to specific regions (first and third regions) where it is most needed, while using simpler self-capacitance sensing in the second region. This partial application of the more complex sensing mode reduces power consumption while maintaining adequate touch detection performance.
3Measurement precision
If both mutual capacitance and self-capacitance sensing are applied to the entire touch sensor area, then the touch detection precision increases, but the sensing time and power consumption increase
Solution Approach 1:
The touch sensor is divided into multiple regions (first region, second region, third region) with different sensing modes applied to each. The first region uses both mutual and self-capacitance sensing, the second region uses only self-capacitance sensing, and the third region uses only mutual capacitance sensing. This segmentation allows the system to maintain accurate touch detection across the entire large area while reducing the overall RC load and sensing time compared to uniform sensing across the whole area.
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 solution effectively reduces sensing time and power consumption by optimizing touch detection through mode switching and capacitance variations, enhancing the performance of large display apparatuses.
Implementation Method 1
The touch sensing device may include a touch sensor and a touch integrated circuit for driving the touch sensor and sensing touches. Examples of well-known touch sensing techniques for the touch sensing device include an electromagnetic induction technique, a pressure sensing technique, and a capacitive technique.
Implementation Method 2
The touch sensing device may determine the locations of touch inputs by a touch integrated circuit detecting a capacitance change in electrodes forming the touch sensor.
Data Source
AI summary
A display apparatus is disclosed that includes a first touch sensor including first driving electrodes and first sensing electrodes arranged in a first area, a second touch sensor including second driving electrodes and second sensing electrodes arranged in a second area, a first touch integrated circuit configured to generate a first sensing signal, a second touch integrated circuit configured to generate a second sensing signal, and a control unit configured to select a touch area including a touch location from among the first area and the second area, based on the first sensing signal and the second sensing signal, and control the first touch integrated circuit and the second touch integrated circuit to sense the touch area in a first sensing mode and the remaining area in a second sensing mode.