Sensor-Equipped Display Device With Segmented Electrodes For Touch Position Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sensor-equipped display devices face challenges in accurately detecting X and Y coordinates and multi-touch inputs due to the design of detection electrodes, which limits precise position detection and requires longer times for second input position information detection.
Innovation Solution
The implementation of a sensor-equipped display device with a common electrode and detection electrodes that include first and second electrodes with varying areas and gradients, allowing for switching between self-capacitive and mutual-capacitive sensing modes to efficiently detect input positions, where the first mode quickly detects initial input information and the second mode finely detects specified areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensing mode is used for all detection scenarios, then the device structure is simple, but the detection precision and speed for different input positions are compromised
Solution Approach 1:
The patent implements dynamic switching between self-capacitive and mutual-capacitive sensing modes based on the detection requirements. The controller automatically selects the appropriate sensing mode for different detection scenarios, enabling the system to adapt its detection mechanism in real-time. This dynamic approach allows high-precision mutual-capacitive detection for second input position information while using simpler self-capacitive detection for first input position information, thereby resolving the contradiction between detection precision and device complexity.
Solution Approach 2:
The patent changes the sensing parameter (sensing mode) based on the detection stage and position. For initial detection of first input position information, self-capacitive sensing is used. For refined detection of second input position information, mutual-capacitive sensing is employed. This parameter change strategy enables the system to optimize detection precision for different scenarios without maintaining complex dual-mode hardware for all situations simultaneously.
2Measurement precision
If only mutual-capacitive sensing is used for all detection, then detection precision is high, but the detection time increases
Solution Approach 1:
The patent applies preliminary action by first using self-capacitive sensing to detect first input position information quickly, which provides an initial detection result. Based on this preliminary detection, the system then performs refined detection using mutual-capacitive sensing for second input position information only in the necessary areas. This two-stage approach with preliminary self-capacitive detection significantly reduces the overall detection time compared to using mutual-capacitive sensing for all detection tasks.
Solution Approach 2:
The patent implements partial action by applying mutual-capacitive sensing only where and when needed for refined detection of second input position information, rather than using it for all detection tasks. The self-capacitive sensing handles the bulk of initial detection work. This selective application of the more precise but slower mutual-capacitive mode optimizes the balance between detection precision and detection time.
3Measurement precision
If detection electrodes have uniform area, then manufacturing is simple, but position detection accuracy is limited
Solution Approach 1:
The patent applies local quality by designing detection electrodes with non-uniform areas tailored to specific detection requirements. Different regions of the display device have detection electrodes with different areas optimized for their local detection needs. For example, areas requiring higher position detection accuracy have electrodes with areas configured to enhance sensitivity in those specific regions. This local optimization approach improves position detection accuracy without requiring complete redesign of all electrodes, thus maintaining reasonable manufacturing simplicity.
4Measurement precision
If detection electrodes are divided into multiple segments, then position detection precision improves, but device complexity increases
Solution Approach 1:
The patent implements segmentation by dividing detection electrodes into multiple segments with different areas. These segmented electrodes are arranged in a matrix pattern across the display device. The segmentation enables independent control and detection for each electrode segment, significantly improving position detection precision. The controller can selectively activate and read signals from specific segmented electrodes based on touch detection needs, achieving high-resolution multi-touch detection while managing complexity through systematic segmentation rather than random complexity.
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 approach enables rapid and precise detection of input positions, improving the accuracy of X and Y coordinate detection and multi-touch capabilities by utilizing the combination of detection electrodes and a common electrode to optimize sensing modes.
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
Implementation Method 2
the sensor is composed of a detection electrode and a sensor driving electrode, which are opposed via a dielectric
Data Source
AI summary
A sensor-equipped display device includes a display panel comprising a common electrode; a sensor comprising a plurality of detection electrodes extending in a first direction and arranged in a second direction crossing the first direction, each of the detection electrodes including a first electrode and a second electrode which are opposed to the common electrode, are divided and extend in the first direction, each of the first electrode and the second electrode including a gradient in width in the first direction in the detection electrode, the gradient in width of the first electrode and the gradient in width of the second electrode being inclined in opposite directions; and a controller configured to effect switching to either a first mode or a second mode, and to control driving of the common electrode and the detection electrodes, wherein the sensor further comprises a dummy electrode disposed between neighboring detection electrodes.