Shielding Layer Structure for Display Device Crosstalk Reduction
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Solution Overview
Problem
As display devices miniaturize and aim for high resolution, parasitic capacitance increases, leading to voltage drop and crosstalk issues due to reduced intervals between thin film transistors (TFTs) and wirings.
Innovation Solution
Incorporating a shielding layer structure with polycrystalline silicon layers doped with impurities, spaced apart to reduce parasitic capacitance and voltage drop, and connected to a constant voltage to prevent crosstalk, while maintaining a predetermined distance from data lines and connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If intervals between TFTs and wirings are reduced for miniaturization, then display device size is reduced, but parasitic capacitance increases
Solution Approach 1:
A shielding layer is introduced as an intermediary element between the data line and driving voltage line. This shielding layer acts as a mediator to block electromagnetic interference and reduce parasitic capacitance coupling between adjacent conductors, allowing miniaturization to proceed without excessive parasitic effects
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and isolated by introducing a dedicated shielding layer structure. The shielding layer separates the problematic electromagnetic interaction from the functional signal paths, removing the harmful coupling effect while maintaining compact dimensions
2Manufacturing precision
If intervals between TFTs and wirings are reduced for high resolution, then pixel density increases, but voltage drop increases
Solution Approach 1:
The shielding layer serves as an intermediary that stabilizes the electromagnetic environment between closely-spaced conductors. By blocking stray electric fields, it prevents unwanted capacitive coupling that would otherwise cause voltage drops in high-density pixel configurations
Solution Approach 2:
The shielding layer is connected to a constant voltage potential, creating an equipotential barrier between adjacent signal lines. This stabilizes the voltage distribution in the miniaturized layout, preventing voltage drops that would occur due to parasitic coupling in high-density configurations
3Object-generated harmful factors
If shielding layer is added to reduce parasitic capacitance, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The shielding layer performs multiple functions simultaneously: it reduces parasitic capacitance, blocks crosstalk between adjacent lines, and provides electromagnetic shielding. This multi-functionality justifies the added structural element by delivering multiple benefits from a single component
Solution Approach 2:
The shielding layer is constructed using the same material as existing doped polycrystalline silicon layers in the display device, creating a composite structure that integrates seamlessly with existing processes. This material reuse reduces complexity by eliminating the need for new materials or fabrication steps
Data Source
AI summary
A display device includes a plurality of pixels, wherein a first pixel of the plurality of pixels includes: a scan line extending in a first direction; a data line and a driving voltage line extending in a second direction crossing the first direction; a switching thin film transistor connected to the scan line and the data line; a driving thin film transistor connected to the switching thin film transistor; a first shielding layer overlapping the data line; and a second shielding layer overlapping the data line, the second shielding layer being spaced apart from the first shielding layer in the second direction such that the first shielding layer and the second shielding layer are spaced apart a predetermined distance apart from each other.