Transflective LCD Panel Transparent Electrode Aperture Ratio
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Solution Overview
Problem
Conventional transflective liquid crystal display panels face challenges in increasing aperture ratio and optical performance due to the presence of non-transparent metal structures, which complicates the design and reduces pixel area as resolution increases.
Innovation Solution
The use of transparent conductive materials like indium tin oxide (ITO) and indium zinc oxide (IZO) for the storage capacitor and common electrode, reducing non-transparent metal structures and enhancing the aperture ratio and transmitting rate, thereby improving optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal structures are fabricated into the transistor and capacitor region to advance display specifications, then the display specification (such as contrast, viewing angle, response time, and NTSC values) is improved, but the aperture ratio is reduced and transmitting rate is lowered
Solution Approach 1:
The patent extracts and removes the metal reflective electrode from the transistor region, replacing it with a transparent conductive layer. This extraction eliminates the non-transparent metal structure that was blocking light, thereby increasing the aperture ratio while maintaining the transistor's switching function through the transparent conductive layer.
Solution Approach 2:
The patent changes the optical parameter of the conductive layer from opaque (metal) to transparent (conductive oxide material). This parameter change allows the conductive layer to perform both electrical function and optical transmission, resolving the contradiction between electrical performance and aperture ratio.
2Area of stationary object
If the aperture ratio is increased by reducing the number of storage capacitors, then the aperture ratio is improved, but electrical instability occurs
Solution Approach 1:
The transparent conductive layer in the transistor region serves multiple functions: it acts as the reflective electrode for the transistor while also serving as part of the storage capacitor structure. This multi-functionality allows the storage capacitor to be formed without additional metal structures, maintaining electrical stability while preserving aperture ratio.
Solution Approach 2:
The patent merges the transistor electrode and storage capacitor electrode functions into a single transparent conductive layer structure. This integration eliminates the need for separate metal structures for both functions, maintaining electrical performance while maximizing the aperture ratio.
3Manufacturing precision
If non-transparent metal structures are used in the pixel region, then the display specification is improved, but the optical performance is significantly affected
Solution Approach 1:
The patent extracts the metal reflective electrode from the pixel region and replaces it with a transparent conductive oxide material. This extraction removes the non-transparent element that was degrading optical performance, allowing light to pass through while maintaining the necessary electrical and reflective functions.
Solution Approach 2:
The patent changes the optical transparency parameter of the conductive layer from opaque to transparent by using conductive oxide materials. This parameter change enables the layer to simultaneously provide electrical conductivity and optical transmission, resolving the contradiction between display specification and optical performance.
Data Source
AI summary
A transflective liquid crystal display panel is disclosed. The transflective liquid crystal display panel includes an array substrate and a storage capacitor disposed on the array substrate. The array substrate includes a transmitting region, a capacitor region, and a transistor region. The storage capacitor preferably includes a first transparent conductive layer covering the transmitting region and the capacitor region, a dielectric layer disposed on the first transparent conductive layer, and a second transparent conductive layer disposed on the dielectric layer. A planarizing layer is disposed on the second transparent conductive layer, and a reflective layer is then disposed on the planarizing layer of the transistor region.