Touch Panel Compensation Sensors for Edge Sensitivity
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Solution Overview
Problem
Touch sensors in touch panels exhibit varying touch sensitivity due to differences in resistive and capacitive components, leading to reduced inter-sensor capacitance and sensitivity, particularly in the uppermost and lowermost rows, which is exacerbated by temperature variations.
Innovation Solution
A compensation touch sensor pattern and driving method that includes upper and lower compensation touch sensors spaced apart from the uppermost and lowermost rows, forming inter-sensor capacitance with adjacent sensors and signal lines to enhance sensitivity, using a sensor driver and switches to control these sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch sensors are arranged in multiple rows and columns with standard spacing, then the touch panel covers a large area, but touch sensors in the uppermost and lowermost rows have reduced inter-sensor capacitance and touch sensitivity
Solution Approach 1:
The patent applies different spacing configurations to different regions of the touch panel. Specifically, touch sensors in the uppermost row are spaced farther apart from the uppermost compensation touch sensor, while touch sensors in the lowermost row are spaced closer to the lowermost compensation touch sensor. This local variation in spacing compensates for the reduced inter-sensor capacitance at the edges, thereby improving touch sensitivity in these regions without compromising the overall large area coverage of the touch panel.
Solution Approach 2:
The patent introduces compensation touch sensors as intermediary elements between the uppermost/lowermost rows of touch sensors and the edge of the touch panel. These compensation touch sensors act as mediators to enhance the inter-sensor capacitance for edge sensors by providing additional capacitive coupling paths, thereby improving touch sensitivity at the boundaries while maintaining the standard sensor array in the central region.
2Reliability
If touch sensors in the uppermost and lowermost rows are spaced closer to compensation touch sensors, then touch sensitivity is enhanced, but the number of touch sensors and inter-sensor capacitance connections increases
Solution Approach 1:
The patent segments the touch sensor array into distinct regions: uppermost row with compensation sensors, middle rows with standard configuration, and lowermost row with compensation sensors. This segmentation allows the complex compensation mechanism to be applied only where needed (at the edges) while maintaining the simple standard configuration in the majority of the panel, thereby reducing overall system complexity while still improving edge sensitivity.
Solution Approach 2:
The patent applies the compensation touch sensor mechanism partially, only to the uppermost and lowermost rows, rather than to all rows. This partial application provides sufficient sensitivity enhancement at the critical edge regions without unnecessarily increasing the complexity and number of sensors in the middle regions where standard spacing already provides adequate performance.
3Reliability
If additional compensation touch sensors are added to enhance edge sensitivity, then touch sensitivity deviation is reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements compensation touch sensors only in the uppermost and lowermost rows where sensitivity degradation occurs, rather than uniformly across all rows. This localized approach addresses the specific problem at the edges while minimizing the increase in overall device complexity and manufacturing cost, as the majority of the panel maintains the simpler standard sensor configuration.
Solution Approach 2:
The patent merges the functional roles of standard touch sensors and compensation touch sensors into a unified sensor array that can be processed and controlled through existing touch panel infrastructure. By integrating the compensation sensors into the existing row-column scanning architecture and using the same transparent conductive film layer, the patent avoids creating a completely separate complex subsystem, thereby reducing the incremental complexity and manufacturing burden.
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
Enhances touch sensitivity of uppermost and lowermost sensors, reducing sensitivity deviations due to environmental changes and eliminating the need for additional sensor channels or computational resources.
Implementation Method 1
forming inter-sensor capacitance with adjacent sensors and signal lines to enhance sensitivity
Data Source
AI summary
A touch panel with a compensation touch sensor pattern and a compensation driving method thereof are disclosed. The touch panel includes: a plurality of touch sensors arranged in a matrix of a plurality of rows and a plurality of columns; a plurality of upper compensation touch sensors each disposed to be spaced apart from a corresponding touch sensor in an uppermost row among the plurality of touch sensors; and a plurality of lower compensation touch sensors each disposed to be spaced apart from a corresponding touch sensor in a lowermost row among the plurality of touch sensors. The touch panel with the compensation touch sensor pattern and the compensation driving method thereof can improve touch sensitivity of uppermost and lowermost touch sensors of a touch sensor array in matrix form by employing compensation touch sensors.