In-Cell Touch Display with Aperture Counter Electrode
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Solution Overview
Problem
Existing display devices with touchpanel functions face challenges in detecting finger or pen contact with high precision and preventing sensor malfunctions due to static electricity, leading to potential burn-in and increased thickness and weight.
Innovation Solution
The implementation of an antistatic layer and conductive paste on the counter substrate, connected to the ground, allows for precise capacitance detection and rapid charge dissipation, eliminating the need for additional electrodes and reducing the risk of sensor malfunctions, while the counter electrode with an aperture enhances capacitance formation between the detection electrode and the contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touchpanel substrate is stuck to the display device to add touch panel function, then the touch panel function is achieved, but the thickness and weight of the whole electronic apparatus increase
Solution Approach 1:
The patent merges the touch panel function with the display panel by integrating the sensor circuit directly into the display device structure. The detection electrode is formed on the counter substrate of the display panel, eliminating the need for a separate touchpanel substrate, thus reducing weight while maintaining touch functionality.
Solution Approach 2:
The counter substrate serves multiple functions: it acts as both the display electrode and the touch sensor electrode. By making the counter substrate universal for both display and touch sensing functions, the patent eliminates the need for additional dedicated touch panel components, thereby reducing overall weight.
2Adaptability or versatility
If a touchpanel substrate is stuck to the display device, then the touch panel function is achieved, but the thickness of the whole electronic apparatus increases
Solution Approach 1:
The patent combines the touch sensor function with the display panel structure by forming the detection electrode directly on the counter substrate. This integration eliminates the need for a separate touchpanel substrate layer, significantly reducing the overall thickness of the display device.
Solution Approach 2:
The patent utilizes the existing counter substrate dimension as the sensing electrode, effectively using the same spatial dimension for both display and touch functions. This dimensional reuse eliminates the need for additional thickness to accommodate a separate touch panel.
3Measurement precision
If electrostatic capacitance system is used to detect contact position, then the detection precision is improved, but the risk of sensor malfunction due to static electricity increases
Solution Approach 1:
The patent introduces a ground connection as an intermediary reference for the detection electrode. By connecting the detection electrode to ground through a switching element, the system establishes a stable reference potential that prevents static electricity accumulation, thereby reducing sensor malfunction risk while maintaining detection precision.
Solution Approach 2:
The patent implements a feedback mechanism where the detection electrode potential is actively controlled by connecting to ground through a switching element. This feedback control ensures that the electrode remains at a stable potential, preventing static charge buildup and improving sensor reliability while maintaining capacitance-based detection precision.
4Measurement precision
If additional electrodes are added to enhance capacitance detection, then the detection precision is improved, but the device complexity increases
Solution Approach 1:
The patent makes the counter substrate serve as both the display electrode and the touch detection electrode. This multi-functionality eliminates the need for additional separate electrodes, reducing device complexity while maintaining capacitance detection precision through the existing counter substrate structure.
Solution Approach 2:
The patent merges the display electrode and detection electrode into a single counter substrate structure. By combining these functions into one component, the patent avoids adding extra electrodes and reduces overall device complexity while preserving the necessary capacitance detection capability.
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 accurate detection of contact positions with high precision, prevents sensor malfunctions, and reduces the risk of burn-in, while maintaining a slim and lightweight design by integrating the touch function directly into the display panel.
Implementation Method 1
detect information about a finger or a pen on a panel surface based on the capacitance variation between the electrode and the finger or pen
Implementation Method 2
The implementation of an antistatic layer and conductive paste on the counter substrate, connected to the ground, allows for precise capacitance detection and rapid charge dissipation
Data Source
AI summary
According to one embodiment, a display device includes a display panel having a counter substrate, an array substrate and a liquid crystal layer held therebetween, a counter electrode provided on the counter substrate, a pixel electrode arranged on the array substrate in a matrix, a sensor circuit arranged between rows of the plurality of pixel electrodes and configured to read out intensity of capacitive coupling between the sensor circuit and a dielectric, and a counter electrode drive circuit configured to pulsatively drive a common voltage added to the counter electrode during a period of driving the sensor circuit, wherein the sensor circuit comprises a detection electrode configured to form capacitance between the sensor circuit and the dielectric and to form capacitance between the sensor circuit and the counter electrode, and wherein the counter electrode comprises an aperture including at least a portion opposed to the detection electrode.