Touch Sensor Electrode Layout for Digitizer-Free Pen Sensing
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Solution Overview
Problem
Existing multimedia electronic devices lack efficient methods to accurately sense inputs from pens, particularly in applications requiring precise touch inputs, such as sketching or drawing, without increasing device thickness or weight by incorporating a digitizer.
Innovation Solution
The electronic device incorporates a sensor layer with a sensor driver that operates in a first mode for touch inputs and a second mode for pen inputs, utilizing a specific electrode configuration and coupling capacitors to differentiate between touch and pen inputs, allowing for precise pen input detection without a separate digitizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate digitizer is incorporated to enable pen input sensing, then pen input detection capability is improved, but device thickness and weight increase
Solution Approach 1:
The patent merges the pen input sensing function with the existing display panel structure by integrating additional electrodes directly into the display panel's electrode configuration. This eliminates the need for a separate digitizer layer, thereby enabling pen input detection without increasing device thickness or weight.
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both the display interface and the sensing interface for pen inputs. By configuring additional electrodes within the display panel structure, the same component performs both display and pen detection functions, eliminating the need for separate dedicated components.
2Adaptability or versatility
If a separate digitizer is incorporated to enable pen input sensing, then pen input detection capability is improved, but device thickness increases
Solution Approach 1:
The patent merges the pen input sensing function with the existing display panel structure by integrating additional electrodes directly into the display panel's electrode configuration. This eliminates the need for a separate digitizer layer, thereby enabling pen input detection without increasing device thickness or weight.
3Measurement precision
If a sensor layer with additional electrodes is added to detect pen inputs, then pen input sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the electrode structure into first electrodes for touch sensing and second electrodes for pen input sensing, with the second electrodes further divided into first and second portions. This segmentation allows the system to distinguish between different input types while maintaining a relatively simple integrated structure within the display panel.
Solution Approach 2:
The patent applies local quality by creating different electrode configurations in different regions of the sensor layer. The first electrodes are arranged for touch detection, while the second electrodes with their specific portions are positioned to detect pen inputs, allowing each region to be optimized for its specific sensing function.
4Adaptability or versatility
If the sensor driver operates in multiple modes to differentiate touch and pen inputs, then input type differentiation capability is improved, but control complexity increases
Solution Approach 1:
The sensor driver is designed to dynamically switch between different operating modes: a first mode for detecting touch inputs using first electrodes, and a second mode for detecting pen inputs using second electrodes. This dynamic operation allows the system to adapt to different input types while using a unified sensor layer structure.
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
Enables accurate sensing of pen inputs while maintaining device thinness and weight, enhancing user interaction in applications like sketching or drawing without the need for additional hardware, thus improving user experience and functionality.
Implementation Method 1
a coupling capacitor may be defined between the first portion and the first trace line
Implementation Method 2
a sensor layer having an active area, and a peripheral area adjacent to the active area... configured to drive the sensor layer by selectively operating in a first mode to sense a touch input or in a second mode to sense a pen input
Data Source
AI summary
An electronic device includes: a sensor layer having an active area, and a peripheral area adjacent to the active area; and a sensor driver to drive the sensor layer by selectively operating in a first mode to sense a touch input or in a second mode to sense a pen input. The sensor layer includes: first electrodes along a first direction, and extending in a second direction crossing the first direction; second electrodes along the second direction, and extending in the first direction; first auxiliary electrodes along the first direction, and extending in the second direction; a first trace line in the peripheral area, and connected with the first auxiliary electrodes; and a first additional electrode in the peripheral area, and including: a first portion overlapping with the first trace line in a plan view; and a second portion connecting one end of the first portion with the sensor driver.