Input/Output Panel With Separate Sensor Electrodes for Noise Isolation
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Solution Overview
Problem
Existing input/output devices face challenges in maintaining high reliability and convenience due to noise interference from writing image data affecting touch sensor sensitivity.
Innovation Solution
The input/output device incorporates a first and second sensor electrode with a liquid crystal or light-emitting material layer, where the second sensor electrode is positioned to generate capacitance without being electrically connected to the display element, and a sub-sensor electrode is provided with a floating potential to reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the common electrode is used as one electrode of the touch sensor, then the device complexity is reduced, but the noise from image writing affects touch sensor sensitivity
Solution Approach 1:
The patent divides the electrode system into separate display electrodes and touch sensor electrodes. The touch sensor electrodes are further segmented into first sensor electrodes and second sensor electrodes positioned on opposite sides of the liquid crystal layer, allowing independent optimization of display and touch functions while reducing noise interference.
Solution Approach 2:
The patent extracts the touch sensing function from the display electrode system by introducing dedicated sensor electrodes. The second sensor electrode is extracted and positioned on the opposite side of the liquid crystal layer from the first sensor electrode, creating a separate sensing path that is less susceptible to display-related noise.
2Measurement precision
If the second sensor electrode is positioned to generate capacitance through the liquid crystal layer, then touch sensitivity is improved, but the structure becomes more complex
Solution Approach 1:
The patent transitions from a planar electrode arrangement to a three-dimensional configuration by positioning the second sensor electrode on the opposite side of the liquid crystal layer from the first sensor electrode. This vertical stacking creates capacitance through the liquid crystal layer, improving touch sensitivity while utilizing the third dimension to reduce lateral complexity.
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 structure enhances the reliability and sensitivity of the touch sensor by isolating noise from image writing, resulting in improved display quality and touch sensitivity.
Implementation Method 1
The second sensor electrode is positioned so that capacitance is generated between the first sensor electrode and the second sensor electrode
Implementation Method 2
The second electrode is positioned so that an electric field for controlling alignment of the liquid crystal material is applied between the first electrode and the second electrode
Data Source
AI summary
An input/output device includes a first sensor electrode and a second sensor electrode. In addition, the input/output device includes a first electrode and a second electrode which are electrodes for a display element, and a substrate sandwiched between the first sensor electrode and the second sensor electrode. The second sensor electrode is formed concurrently with the first electrode using the same material. The input/output device sensors a change in capacitance of a capacitor formed between the first sensor electrode and the second sensor electrode. Furthermore, a third sensor electrode to which a floating potential is applied may be provided to overlap with the first electrode. In the input/output device, either a liquid crystal element or a light-emitting element may be used, or both the liquid crystal element and the light-emitting element may be used.