Polycrystalline Silicon Display Substrate Aperture Ratio
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses face challenges in achieving high resolution and brightness while minimizing power consumption, particularly in portable devices where increasing backlight brightness is limited by power supply constraints.
Innovation Solution
A display substrate with a polycrystalline silicon layer and a storage capacitor, where the polycrystalline silicon layer is doped and formed using a sequential lateral solidification process, and a gate metal layer with transparent conductive materials, enhancing aperture ratio and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight assembly brightness is increased to achieve high resolution and high brightness display, then the display quality is improved, but the power consumption increases
Solution Approach 1:
The patent changes the material parameters of the pixel electrode from conventional transparent conductive oxides (ITO, IZO) to polycrystalline silicon with controlled doping concentrations. This material substitution fundamentally alters the electrical and optical parameters, enabling higher aperture ratio and improved light transmission without requiring increased backlight brightness, thus resolving the contradiction between display brightness and power consumption
2Illumination intensity
If the aperture ratio is increased to improve display brightness and efficiency, then the light transmission is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the pixel electrode and storage capacitor electrode functions into a single polycrystalline silicon layer structure. The pixel electrode is formed by doped regions of the polycrystalline silicon layer, while the storage capacitor utilizes the same polycrystalline silicon layer as one of its electrodes. This integration reduces the number of separate manufacturing steps and material depositions, simplifying the overall fabrication process while achieving high aperture ratio
Solution Approach 2:
The polycrystalline silicon layer serves multiple functions simultaneously: it acts as the pixel electrode for light transmission, provides the storage capacitor electrode for charge storage, and forms the semiconductor channel layer for transistor operation. This multi-functionality reduces the number of separate components needed, thereby simplifying manufacturing while improving aperture ratio
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
The solution improves display quality by increasing aperture ratio and transmittance, thereby enhancing the brightness and efficiency of LCD apparatuses without significant power consumption increases.
Implementation Method 1
The polycrystalline silicon layer is firstly doped with impurities to form a channel portion of a switching element and a first storage electrode. The polycrystalline silicon layer is secondly doped with impurities to form a doped portion of the switching element
Implementation Method 2
a gate metal layer with transparent conductive materials, enhancing aperture ratio and transmittance
Data Source
AI summary
A display substrate includes a plurality of pixels. Each of the pixels includes a switching element, a storage capacitor, a storage line and a pixel electrode. The switching element includes a polycrystalline silicon layer having a channel portion and a doped portion, a gate electrode, a source electrode and a drain electrode. The gate electrode is formed on the channel portion and has a lower layer and an upper layer. The source electrode and the drain electrode make contact with the doped portion. The storage capacitor includes a first storage electrode formed from a layer substantially same as the polycrystalline silicon layer and a second storage electrode formed from a layer substantially same as the lower layer of the gate electrode.