Array Substrate Storage Capacitor Voltage Retention
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Solution Overview
Problem
Reflective or semi-transmissive liquid crystal displays face high power consumption due to backlight usage and leakage currents, which affect display quality and voltage retention in pixel electrodes.
Innovation Solution
An array substrate with a thin film transistor and storage capacitor structure, including a metal layer, intermediate layer, and reflective layer stacked on a base substrate, where the reflective layer is connected to the common electrode and active layer of the transistor, forming a parallel storage capacitor to reduce voltage variations and utilize ambient light for power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight source is used in liquid crystal display, then display brightness is improved, but power consumption increases significantly (70%-80% of total power consumption)
Solution Approach 1:
The patent combines the storage capacitor electrode with the common electrode into a single integrated structure. The common electrode serves dual functions: as the common electrode for liquid crystal control and as one electrode of the storage capacitor. This merging eliminates the need for a separate storage capacitor electrode, reduces the number of layers, and enables the storage capacitor to utilize the common electrode's capacitance with the pixel electrode, thereby reducing overall power consumption while maintaining display brightness.
2Ease of manufacture
If leakage current is present in liquid crystal display, then manufacturing is simplified, but voltage retention of pixel electrodes deteriorates
Solution Approach 1:
The patent implements a storage capacitor that is electrically connected in parallel with the liquid crystal capacitor before discharge can occur. The storage capacitor is formed using the common electrode and pixel electrode, creating a parallel circuit path that prevents voltage decay. By establishing this preliminary protective structure, the system maintains voltage retention without requiring additional manufacturing steps or complex processes.
3Reliability
If a separate storage capacitor electrode is added, then voltage retention is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent makes the common electrode serve multiple functions: it acts as the common electrode for liquid crystal voltage control and simultaneously serves as one electrode of the storage capacitor. The pixel electrode also serves dual purposes as the pixel electrode and the other electrode of the storage capacitor. This multi-functionality eliminates the need for additional dedicated storage capacitor electrodes, reducing structural complexity while ensuring voltage retention.
4Use of energy by moving object
If reflective layer is added to utilize ambient light, then backlight power consumption is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges the storage capacitor structure with the common electrode and pixel electrode, forming the storage capacitor using existing functional layers rather than adding separate dedicated layers. The storage capacitor is created by utilizing the capacitance between the common electrode and pixel electrode, which are already present in the display structure. This approach reduces the need for additional reflective layers and complex alignment processes while still enabling ambient light utilization and power savings.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances voltage retention in liquid crystal pixel capacitors, reduces backlight power consumption, and improves display quality by minimizing leakage current effects and leveraging ambient light.
Implementation Method 1
Reflective or semi-transmissive display has always been an important technology for low power consumption liquid crystal display
Implementation Method 2
the storage capacitor comprises a metal layer, an intermediate layer, and a reflective layer disposed in a stacked manner
Data Source
AI summary
An array substrate and a method for manufacturing the same, and a display device are provided. The array substrate includes a base substrate and the array substrate includes a plurality of pixel units. In each of the plurality of pixel units, the array substrate includes a thin film transistor and a storage capacitor disposed above the base substrate, the storage capacitor includes a metal layer, an intermediate layer, and a reflective layer disposed in a stacked manner, the metal layer being adjacent to the base substrate. The array substrate further includes a common electrode layer disposed on a side of the storage capacitor facing away from the base substrate, the reflective layer is electrically connected to the common electrode layer, and the metal layer is electrically connected to an active layer of the thin film transistor.