Display Perimeter Conductor Layout for Uniform Corner Proximity Sensing
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Solution Overview
Problem
Capacitive proximity sensors in display devices exhibit varying detection sensitivity between corner and straight regions, leading to incorrect detection of object proximity due to differences in capacitance formation.
Innovation Solution
The display device features conductors arranged along the outer periphery of the display region with corner portions that are at least partially bent, and the capacitance between the conductors and an object is adjusted to be equal to that in straight regions, reducing sensitivity variations by spacing conductors apart at corners or altering their width and electromagnetic coupling with ground electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductors are arranged around the display region to form a proximity sensor, then the proximity detection function is achieved, but the detection sensitivity varies between corner portions and straight regions leading to incorrect detection
Solution Approach 1:
The patent applies local quality by making the corner portions of the display region bent rather than straight, creating a geometric difference between corner and straight regions. This local geometric modification changes the capacitance characteristics at corner portions, balancing the detection sensitivity across different regions of the proximity sensor.
Solution Approach 2:
The patent changes the geometric parameter of the display region corners from straight to bent, which directly alters the capacitance formation characteristics. This parameter change compensates for the inherently higher capacitance at straight corner portions, achieving uniform detection sensitivity across the entire sensor perimeter.
2Reliability
If the conductor area at corner portions is large, then the proximity sensor can detect objects, but the detection sensitivity becomes too high causing false detection at corners
Solution Approach 1:
The bent corner design creates a local geometric difference that reduces the effective conductor area at corner portions compared to straight regions. This local modification prevents excessive capacitance formation at corners while maintaining adequate detection coverage, achieving balanced sensitivity across all regions.
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 allows for accurate detection of object proximity by minimizing sensitivity differences between corner and straight regions, ensuring consistent detection across the display device.
Implementation Method 1
capacitances are formed between the conductors and an object to be detected
Implementation Method 2
the area where each of conductor portions 401 located at corner portions C capacitively couples to an object to be detected
Data Source
AI summary
The present invention provides a display device that can correctly detect the approach of an object to be detected. A display device (10) includes conductors (40a) and (40b) arranged outside a display region (R) on a display substrate so as to extend along the outer periphery of the display region (R). The conductors (40a) and (40b) are configured such that a predetermined voltage is applied thereto and capacitances are formed between the conductors and an object to be detected. The outer periphery of the display region (R) has a corner portion (C) that is at least partially bent. The conductors (40a) and (40b) are adapted such that the capacitance formed between the conductors and the object to be detected at the corner portion (C) is adjusted so as to be approximately equal to the capacitances formed between the conductors and the object to be detected in regions other than the corner portion (C).