Array Substrate Shielding Electrodes for In-Cell Touch Display Light Leakage
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Solution Overview
Problem
In touch display devices with an in-cell structure, the formation of slots in the common electrode layer for touch functionality can lead to electric field leakage and light leakage due to misalignment and narrow metal wiring, degrading image performance and complicating the fabrication process.
Innovation Solution
The array substrate features a common electrode layer with overlapping first and second slots, along with shielding electrodes and branch electrodes that are electrically connected, positioned above the data and gate lines to prevent electric field leakage and light leakage, while also allowing for a wider aperture region to simplify the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal wirings are disposed between the slot and the data line to shield the electric field, then light leakage is reduced, but the fabrication process becomes more difficult due to alignment and width control issues
Solution Approach 1:
The patent introduces a shielding electrode as an intermediary element positioned between the data line and the slot in the common electrode layer. This shielding electrode acts as a mediator to block the electric field leakage from the data line into the slot, thereby preventing light leakage. The shielding electrode is connected to the common electrode through a connection electrode, creating an intermediate structure that simplifies the fabrication process compared to directly positioning metal wirings in the slot region.
Solution Approach 2:
The patent extends the shielding electrode in the row direction (horizontal dimension) beyond the slot region, and connects it to the common electrode through a connection electrode in the column direction (vertical dimension). This dimensional extension allows the shielding function to be achieved without requiring precise alignment in the slot region, thereby simplifying the fabrication process while maintaining effective electric field shielding.
2Adaptability or versatility
If the common electrode layer is divided into common electrode blocks through etching slots, then touch panel functionality is achieved, but electric field leakage occurs from the slot facing the data line
Solution Approach 1:
The common electrode layer is segmented into multiple common electrode blocks by etching slots, which enables the touch panel functionality by allowing independent control of different regions. This segmentation is necessary for achieving multiplexed touch sensing capability while maintaining display functionality.
Solution Approach 2:
A shielding electrode is introduced as an intermediary element positioned between the data line and the slot region. This shielding electrode blocks the electric field leakage from the data line into the slot, preventing the harmful effect while preserving the segmentation structure needed for touch functionality. The shielding electrode is connected to the common electrode through a connection electrode, integrating it into the existing structure.
3Area of stationary object
If narrow metal wirings are used in the common electrode layer, then the aperture region is increased, but misalignment between the metal wiring and data line causes light leakage
Solution Approach 1:
The shielding electrode serves as an intermediary structure that extends in the row direction beyond the slot region, providing a larger coverage area for electric field shielding. This extended structure reduces the requirement for precise alignment between the shielding structure and the data line, thereby relaxing the manufacturing precision requirements while maintaining effective shielding and maximizing the aperture region.
Solution Approach 2:
The shielding electrode is extended in the horizontal dimension (row direction) beyond the vertical dimension (column direction) slot region, creating a two-dimensional shielding structure. This dimensional extension allows the shielding function to be achieved with less stringent alignment requirements, facilitating easier manufacturing while maintaining large aperture area.
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 effectively reduces light leakage and improves image performance by shielding the electric field, making the fabrication process easier and avoiding short-circuits between common electrodes.
Implementation Method 1
at least one shielding electrode disposed above the data line; and at least one shielding branch electrode disposed above the gate line and electrically connected to the shielding electrode
Data Source
AI summary
An array substrate, a display device and a method for fabrication the array substrate are provided. The array substrate comprises a base substrate; gate lines and data lines; pixel electrodes; a common electrode layer including at least one first slot and at least one second slot at least partially overlapped with the first slot; at least one shielding electrode disposed above the data line; and at least one shielding branch electrode disposed above the gate line and electrically connected to the shielding electrode. A projection of the shielding electrode onto the data line is at least partially overlapped with the data line, a projection of the shielding branch electrode onto the gate line is at least partially overlapped with the gate line, and the array substrate exhibits at least one raised area where the at least one shielding branch electrode is embedded.