SiOC Protective Layer for LCD Signal Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays, particularly PLS mode displays, face issues with afterimages and signal interference due to the limitations of existing materials and manufacturing processes.
Innovation Solution
The use of a SiOC layer with a thickness of two to three micrometers as a protective layer in the liquid crystal display, which provides superior heat resistance and sufficient spacing between signal lines to prevent signal interference and reduce afterimage deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thin protective layer is used to reduce manufacturing complexity, then device complexity is reduced, but signal interference occurs between common electrode and signal lines
Solution Approach 1:
The patent introduces a SiOC layer as an intermediary substance between the common electrode and signal lines. This layer acts as a mediator that provides electrical insulation and prevents signal interference while maintaining a relatively compact structure. The SiOC layer with thickness of 500-2000 angstroms serves as the harmful factor countermeasure, blocking parasitic capacitance formation between adjacent conductive elements.
Solution Approach 2:
The patent optimizes the thickness parameter of the protective layer to resolve the contradiction. By specifying the SiOC layer thickness within the range of 500-2000 angstroms, the invention finds the optimal balance point where the layer is thick enough to prevent signal interference but thin enough to maintain manufacturing efficiency and device compactness.
2Ease of manufacture
If organic protective layers are used to simplify manufacturing, then ease of manufacture is improved, but heat resistance is insufficient causing afterimage deterioration
Solution Approach 1:
The patent employs SiOC (silicon oxycarbide) material which combines properties of both organic and inorganic materials. This composite material provides the ease of deposition characteristic of organic layers through PECVD process while simultaneously offering the superior heat resistance of inorganic materials, thereby resolving the contradiction between manufacturing simplicity and thermal stability.
Solution Approach 2:
The patent changes the material parameter from conventional organic protective layers to SiOC material. This material substitution enables the layer to withstand higher temperatures during manufacturing processes and operation, preventing afterimage deterioration while maintaining compatibility with existing PECVD manufacturing processes.
3Productivity
If signal lines are positioned closer to the common electrode to increase pixel density, then productivity is improved, but signal interference increases
Solution Approach 1:
The SiOC layer serves as an intermediary insulating barrier that enables closer positioning of signal lines to the common electrode. By providing effective electrical insulation, this layer allows increased pixel density through reduced spacing without suffering from parasitic capacitance or signal interference, thus resolving the contradiction between productivity and signal integrity.
Data Source
AI summary
A display apparatus includes a first substrate including pixels, a second substrate facing the first substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. Each of the pixels includes a thin film transistor disposed on a first insulating substrate, a first protective layer that covers the thin film transistor and includes a SiOC layer, a first electrode disposed on the first protective layer, a second protective layer that covers the first electrode, and a second electrode disposed on the second protective layer.