Storage Capacitor Wiring Layout for Low Crosstalk LCD Panels
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Solution Overview
Problem
In electro-optical devices with active matrix drive systems, the formation of storage capacitors is hindered by the need for precise balance with scanning lines, data lines, and pixel electrodes, and the use of contact holes for electrical connections can lead to higher resistance and cross-talk issues, affecting image quality.
Innovation Solution
The electro-optical device features a capacitor wire formed as the same film as the exterior circuit connection terminals, eliminating the need for contact holes and reducing resistance by integrating the capacitor wire with the laminate structure, ensuring stable potential supply to storage capacitors and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are used to connect capacitor electrodes to exterior circuit terminals, then electrical connection is achieved, but resistance increases and image quality deteriorates
Solution Approach 1:
The patent merges the capacitor wire with the exterior circuit terminal by forming them as the same film structure. This eliminates the need for separate contact holes to connect the capacitor electrode to the exterior terminal, thereby reducing resistance and preventing image cross-talk while maintaining reliable electrical connection.
Solution Approach 2:
The patent transitions from a vertical connection approach (using contact holes through insulating layers) to a planar integration approach where the capacitor wire and exterior terminal exist in the same film layer, eliminating the need for deep vertical connections and reducing resistance.
2Reliability
If storage capacitors are formed on substrate with precise balance with scanning lines and data lines, then potential retention is improved, but device complexity increases
Solution Approach 1:
The exterior circuit terminal serves dual functions: it provides external electrical connection and simultaneously serves as the capacitor wire (capacitor electrode extension). This multi-functionality reduces the number of separate components needed while maintaining effective potential retention in storage capacitors.
Solution Approach 2:
By forming the capacitor wire as the same film as the exterior terminal, the patent ensures continuous equipotential connection from the capacitor electrode through the capacitor wire to the exterior terminal, maintaining stable potential without requiring complex intermediate connection structures.
3Ease of manufacture
If capacitor wire is formed as separate structure from exterior terminals, then manufacturing flexibility is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The patent combines the capacitor wire and exterior terminal into a single film formation process, eliminating the need for separate alignment and connection steps. This reduces manufacturing precision requirements while maintaining manufacturing flexibility through standard film deposition techniques.
Data Source
AI summary
An electro-optical device has data lines and scanning lines, TFTs, pixel electrodes, and storage capacitors having capacitor electrodes connected to the TFTs and the pixel electrodes, and the like. In an image display region, a capacitor wire is formed to be connected to or to extend to the capacitor electrodes, and the capacitor wire also extends to exterior circuit connection terminals provided in a peripheral region. By appropriately supplying a predetermined potential to the capacitor electrodes of the storage capacitors, generation of problems, such as a cross-talk on an image or the like, can be suppressed as much as possible, thereby displaying a high quality image.