Sensing Electrode Segmentation for Display Touch Sensitivity
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Solution Overview
Problem
Existing electronic devices with organic light-emitting layers face challenges in achieving enhanced sensing performance due to limitations in pixel arrangement and sensor electrode design.
Innovation Solution
The electronic device incorporates a display layer with a specific arrangement of first, second, and third pixels, and a sensor layer with a sensing electrode that includes first and second portions. The sensing electrode is designed to extend between pixel groups without overlapping the pixels, enhancing mutual capacitance and sensing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing electrode is designed to extend between pixel groups, then sensing sensitivity is improved, but device complexity increases
Solution Approach 1:
The sensing electrode is divided into multiple segments (first sensing electrode and second sensing electrode) with distinct portions (first portion and second portion). Each segment serves a specific function: the first portion adjacent to pixels for signal detection and the second portion extending between pixel groups for capacitance enhancement. This segmentation allows the electrode to achieve improved sensing sensitivity while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The sensing electrode structure transitions from a simple linear arrangement to a two-dimensional configuration with portions extending in different directions (first direction between pixels, second direction between pixel groups). This dimensional expansion increases the effective sensing area and mutual capacitance between electrode segments, thereby improving sensing sensitivity without proportionally increasing overall device complexity.
2Object-affected harmful factors
If the sensing electrode does not overlap pixels, then white angular dependency is mitigated, but sensing area is reduced
Solution Approach 1:
The design extracts the sensing function from the pixel-overlapping regions and relocates it to the spaces between pixel groups. The sensing electrode portions are specifically positioned in the inter-pixel and inter-pixel-group regions, removing the harmful overlap with pixels that causes white angular dependency while maintaining adequate sensing area through strategic placement in available space.
Solution Approach 2:
Different portions of the sensing electrode are assigned different functions and positions: the first portion is localized adjacent to pixels for signal detection, while the second portion is localized between pixel groups for capacitance enhancement. This local differentiation allows the electrode to mitigate white angular dependency in pixel regions while maintaining sufficient sensing area in inter-pixel regions through optimized local positioning.
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
The proposed design improves the sensing sensitivity of the electronic device by increasing mutual capacitance between sensing electrodes, while also mitigating white angular dependency issues, resulting in enhanced display performance.
Implementation Method 1
The second portions are spaced apart from each other in the first direction, and are disposed between the first pixel group and the second pixel group
Data Source
AI summary
An electronic device includes: a sensor layer on a display layer, the sensor layer including a sensing electrode, the display layer including: first pixels, second pixels spaced apart from the first pixels in a first direction, and third pixels arranged with the first pixels along a second direction, the second pixels are arranged along the second direction, and two adjacent second pixels form a first pixel group, the two second pixels are spaced apart by a first distance in the second direction, and the first pixel group is spaced apart by a second distance in the second direction from a second pixel group, the sensing electrode includes a first sensing electrode and a second sensing electrode each including sensing patterns each sensing pattern including a first portion adjacent to the first and third pixels, and a second portion extending in the first direction between the first and second pixel group.