Input-Sensing Device Electrode Protrusions for Capacitance Uniformity
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Solution Overview
Problem
Conventional input-sensing devices face issues with spatial variation of capacitance and the 'ghost phenomenon' in accurately sensing inputs, particularly due to uneven capacitance distribution, which affects the precision of input detection and can lead to errors in specific regions.
Innovation Solution
The input-sensing device incorporates a configuration of receiving and transmitting electrodes with specific frame and protruding portions, along with signal lines arranged alternately on both sides of the sensing region, to achieve uniform capacitance and prevent spatial variations, thereby enhancing input detection precision and suppressing the 'ghost phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional input-sensing devices are used, then the device structure is simple, but spatial variation of capacitance occurs and measurement precision deteriorates
Solution Approach 1:
The patent applies local quality by making different parts of the electrodes have different structures. Specifically, the receiving electrodes and transmitting electrodes are divided into first sensors and second sensors, where the second sensors have protruding portions that extend toward adjacent sensors. This local structural variation compensates for capacitance differences at different positions, achieving uniform capacitance distribution across the sensing region while maintaining overall structural simplicity.
Solution Approach 2:
The patent changes physical parameters of the electrode structures to achieve uniform capacitance. By adjusting the position and shape of protruding portions on sensors, the capacitance values of first and second sensors are modified to be substantially equal. This parameter adjustment eliminates spatial variation without requiring complex additional components.
2Measurement precision
If signal lines are arranged on one side of sensing region, then device complexity is low, but ghost phenomenon occurs and measurement precision deteriorates
Solution Approach 1:
The patent segments the signal line arrangement by dividing signal lines into first signal lines and second signal lines. First signal lines are arranged on one side of the sensing region connected to first sensors, while second signal lines are arranged on the other side connected to second sensors. This segmentation balances the electrical load and capacitance distribution, preventing ghost phenomenon while maintaining a relatively simple overall layout.
3Measurement precision
If uniform capacitance distribution is achieved through complex electrode structures, then measurement precision improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses partial action by providing protruding portions only on second sensors rather than all sensors. These protruding portions extend a specific distance toward adjacent sensors to provide additional capacitance compensation. This partial modification is sufficient to achieve uniform capacitance distribution without requiring precise positioning on every sensor, thereby reducing overall manufacturing precision requirements.
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 ensures improved uniformity in capacitance between adjacent sensors, reducing errors in input sensing and allowing for a thinner bezel design in display devices, while effectively addressing the 'ghost phenomenon and spatial variation issues.
Implementation Method 1
an input-sensing device that is configured to sense an external input signal... each of the receiving electrodes including a first receiving sensor and a second receiving sensor... each of the transmitting electrodes including a first transmitting sensor and a second transmitting sensor
Data Source
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AI summary
An input-sensing device may include a plurality of sensors, and each of the plurality of sensors includes a plurality of protruding portions, and a plurality of signal lines that are connected to some of the plurality of sensors. The number of the protruding portions included in a sensor that is connected to one of the plurality of signal lines may be less than the number of the protruding portions included in another sensor that is connected to another one of the plurality of signal lines.