Overlapping Pixel-Sensor Panel With Shared Lines for Touch Reliability
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Solution Overview
Problem
Existing input/output devices and panels face challenges in reducing the number of wirings and enhancing the convenience and reliability of touch sensing capabilities, particularly in display elements where common electrodes are used for both display and touch sensing, leading to inefficiencies and potential interference.
Innovation Solution
The proposed input/output panel integrates a sensor element overlapping with a pixel, connected by a signal line, control line, and scan line, utilizing a first and second conductive film to form an electric field shielded by an approaching object, allowing for reduced wiring and efficient touch sensing through electrostatic capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate signal lines are used for display and touch sensing, then signal transmission reliability is improved, but device complexity and wiring density increase
Solution Approach 1:
The patent combines display signal transmission and touch sensing functions into a single signal line. The signal line serves dual purposes: transmitting display signals during display operation and sensing touch inputs during touch operation, thereby reducing wiring density while maintaining functional reliability through context-dependent signal interpretation
Solution Approach 2:
The signal line is designed with multi-functionality, capable of operating in different modes (display mode and touch sensing mode) based on system state. This universal design allows the same physical infrastructure to support multiple functions, reducing overall device complexity without sacrificing the reliability of either function when actively used
2Device complexity
If common electrode is used for both display and touch sensing, then device complexity is reduced, but sensing precision and display performance deteriorate due to interference
Solution Approach 1:
The patent segments the electrode system into distinct first and second electrodes with different functional specializations. The first electrode primarily serves display functions while the second electrode is optimized for touch sensing, reducing mutual interference and improving both display quality and touch sensing precision while maintaining relatively simple overall structure
Solution Approach 2:
Different regions of the electrode structure are assigned different qualities and functions. The first electrode has properties optimized for display signal transmission, while the second electrode has properties optimized for touch sensing sensitivity, allowing each component to perform its specific function with high precision without compromising the other
3Measurement precision
If higher sensor element density is implemented, then touch sensing resolution is improved, but wiring complexity and manufacturing difficulty increase
Solution Approach 1:
By merging display and touch sensing functions into shared signal lines, the patent reduces the total number of wiring connections required. This allows higher sensor element density to be achieved without proportionally increasing wiring complexity, as the same signal lines serve dual purposes and manufacturing processes can be streamlined
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 enables convenient and reliable touch sensing with reduced wiring, allowing for higher sensor and display element density, improved sensitivity, and higher resolution image display.
Implementation Method 1
the second conductive film is electrically connected to the signal line, and provided such that an electric field is formed between the first conductive film and the second conductive film
Implementation Method 2
an object approaching the pixel can be sensed on the basis of a change in electrostatic capacitance
Data Source
AI summary
To provide a novel input/output panel that is highly convenient or reliable, a novel input/output device that is highly convenient or reliable, a novel input/output panel, a novel input/output device, or a novel semiconductor device. The input/output panel includes a pixel, a sensor element, a signal line, a control line, and a scan line. The sensor element has a region overlapping with the pixel. The signal line is electrically connected to the sensor element and the pixel. The control line is electrically connected to the sensor element. The scan line is electrically connected to the pixel.