Sensor-Equipped Display Device Segmented Electrode Time Constant Reduction
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Solution Overview
Problem
As the size of display devices increases, the time constant of the sensor driving electrode also increases, leading to longer sensing times, which is a problem in detecting position information accurately and efficiently.
Innovation Solution
The sensor-equipped display device design includes a common electrode that functions as both a display and sensor driving electrode, with first and second electrodes spaced apart and alternately arranged, allowing for a reduced time constant by selectively writing a write signal to either electrode group, thereby reducing the load and time needed for sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of display devices increases, then the display area is improved, but the time constant of the sensor driving electrode increases leading to longer sensing times
Solution Approach 1:
The sensor driving electrode is divided into multiple segments (first sensor driving electrode and second sensor driving electrode) that can be independently controlled. This segmentation allows the sensing operation to be performed on smaller electrode sections rather than the entire large electrode, thereby reducing the time constant and sensing time while maintaining the large display area
Solution Approach 2:
The patent implements dynamic control of the sensor driving electrode by selectively applying write signals to different segments at different times. The first driver writes signals to the first sensor driving electrode while the second driver writes to the second sensor driving electrode in a time-division manner, enabling adaptive sensing that reduces the effective time constant for large display devices
2Area of stationary object
If the size of display devices increases, then the display area is improved, but the load on the sensor driving electrode increases
Solution Approach 1:
By dividing the sensor driving electrode into multiple segments with independent drivers, the electrical load on any single electrode segment is reduced. Each segment handles only a portion of the total sensing task, distributing the energy burden and reducing the load on individual components while maintaining the functionality across the entire large display area
Solution Approach 2:
The dynamic time-division multiplexing of the first and second drivers reduces the instantaneous load on the sensor driving electrode system. By alternating or concurrently activating different electrode segments based on sensing needs, the system optimizes energy utilization and reduces peak load requirements for large display devices
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 faster sensing times by reducing the time constant of the sensor driving electrode, improving the accuracy and efficiency of detecting position information on larger display devices.
Implementation Method 1
there is known an electrostatic capacitance-type sensor which detects a contact or an approach of a conductor, such as a finger, based on a variation in electrostatic capacitance
Data Source
AI summary
According to one embodiment, sensor-equipped display device includes a display panel, a first driver, and a second driver. The display panel includes a first electrode, a second electrode and a detection electrode. The first driver delivers a common driving signal to the first electrode and the second electrode at a time of display driving, and selectively writes a write signal to one of the first electrode and the second electrode at a time of sensing driving. The second driver reads, from the detection electrode, a read signal indicative of a variation of a sensor signal occurring between the one of the first electrode and the second electrode, on one hand, and the detection electrode, on the other hand, at the time of the sensing driving.