Transparent Storage Capacitor Layout for Higher Display Aperture
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Solution Overview
Problem
Current display substrates have a low aperture ratio due to opaque storage capacitors, which restrict the area of non-opaque regions and affect the overall display performance.
Innovation Solution
A display substrate with a transparent storage capacitor plate, utilizing metal oxide and conductive semiconductor materials, integrated into the pixel unit to allow light transmission and increase the non-opaque area, thereby enhancing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an opaque storage capacitor is used in the pixel unit, then the storage capacitor can be formed with conventional materials, but the aperture ratio of the display substrate is reduced due to the opaque structure occupying non-opaque region area
Solution Approach 1:
The patent applies the color changes principle by transitioning the storage capacitor plate from opaque to transparent state. This is achieved by selecting transparent conductive materials (such as ITO, IZO, or ZnO:Al) for the capacitor plate, which fundamentally changes the optical property from opaque to transparent, allowing light to pass through the capacitor structure and thereby increasing the aperture ratio without sacrificing the capacitor's functional area
Solution Approach 2:
The patent employs composite materials principle by using transparent conductive oxide materials combined with semiconductor materials (such as IGZO or ITZO) to form the storage capacitor structure. This composite approach maintains the electrical functionality of the capacitor while achieving optical transparency, thus resolving the contradiction between capacitor formation and aperture ratio enhancement
2Reliability
If the storage capacitor area is increased to improve display performance, then the capacitance function is enhanced, but the non-opaque region area is reduced
Solution Approach 1:
By changing the optical property of the capacitor plate from opaque to transparent through material selection, the patent allows the capacitor to maintain its full area for storage function while not blocking light in the display region. The transparent plate enables the capacitor to occupy space without reducing the effective non-opaque region area, thus simultaneously improving reliability and maintaining display performance
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 transparent storage capacitor plate enables a larger non-opaque region and higher aperture ratio in the display substrate, improving display performance without reducing the storage capacitor's area.
Implementation Method 1
a plate of the storage capacitor being a transparent plate... to allow light transmission and increase the non-opaque area
Data Source
AI summary
Provided is a display substrate. The display includes a base substrate, and a pixel unit disposed on the base substrate, wherein the pixel unit includes a storage capacitor, a plate of the storage capacitor being a transparent plate. The pixel unit further comprises an active layer and a source/drain pattern, which are disposed in two different layers.