Transflective LCD Panel Stacked Capacitor Aperture Ratio
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Solution Overview
Problem
Conventional transflective liquid crystal display panels face challenges in increasing aperture ratio and transmitting rate due to the complexity of metal structures, which affects optical performance and leads to electrical instability when reducing storage capacitors.
Innovation Solution
The design incorporates a stacked capacitor formed by a reflective electrode and a transparent conducting layer connected in parallel, reducing metal structure utilization and enhancing aperture ratio and transmitting rate, while maintaining sufficient capacity and electrical stability through multiple dielectric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If numerous metal structures are fabricated into the transistor and capacitor region, then the display panel can achieve advanced specifications, but the aperture ratio is reduced and transmitting rate is lowered
Solution Approach 1:
The invention merges the storage capacitor structure with the reflective electrode structure by forming the capacitor electrode, insulating layer, and reflective electrode in an integrated manner. This combination reduces the number of separate metal structures needed, thereby increasing the aperture ratio while maintaining display specifications.
Solution Approach 2:
The reflective electrode structure serves dual functions: it acts as both the reflective electrode for the transflective display mode and as part of the storage capacitor structure. This multi-functionality eliminates the need for separate capacitor structures, reducing metal usage and increasing aperture ratio.
2Area of stationary object
If the aperture ratio is increased by reducing the number of storage capacitors, then more area is available for light transmission, but electrical instability occurs
Solution Approach 1:
The storage capacitor is merged with the reflective electrode structure, allowing the capacitor to be formed within the same structural footprint as the reflective electrode. This integration maintains electrical stability by ensuring proper capacitor formation while maximizing aperture ratio.
Solution Approach 2:
The insulating layer is selectively formed only in the capacitor region between the capacitor electrode and reflective electrode, rather than uniformly across the entire structure. This localized approach ensures proper electrical isolation for capacitor stability while minimizing impact on overall aperture ratio.
3Area of stationary object
If the aperture ratio is increased by reducing metal structures, then transmitting rate is improved, but the complexity of maintaining sufficient capacitor capacity increases
Solution Approach 1:
The capacitor structure is merged with the existing reflective electrode layers, utilizing the same structural components (electrode, insulating layer, substrate) for both capacitor and reflective functions. This reduces overall device complexity while maintaining sufficient capacitor capacity.
Solution Approach 2:
The capacitor structure utilizes composite layers including the reflective electrode material combined with insulating materials (such as silicon oxide, silicon nitride, or silicon oxynitride) to form a multi-layer composite structure that achieves both capacitor functionality and reflective performance with minimized material usage.
Data Source
AI summary
A transflective liquid crystal display panel is disclosed. The liquid crystal display panel includes an array substrate and a storage capacitor disposed on the array substrate. The array substrate includes a transmitting region and a reflecting region, in which the storage capacitor is disposed on the reflecting region of the array substrate. The storage capacitor also includes a first transparent conducting layer disposed on the array substrate, a dielectric layer disposed on the first transparent conducting layer, and a reflective conducting layer disposed on the dielectric layer.