Transparent Storage Capacitor Plate for Higher Pixel 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
1Ease of manufacture
If an opaque storage capacitor is used in the pixel unit, then the storage capacitor can be formed with conventional materials and processes, 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 changes the optical parameter (transparency) of the storage capacitor plate from opaque to transparent by selecting specific transparent conductive materials such as ITO, IZO, or ZnO, while maintaining the electrical conductivity function. This allows the storage capacitor to be visually transparent, increasing the aperture ratio without compromising manufacturability through conventional sputtering or atomic layer deposition processes
Solution Approach 2:
The patent employs composite material structures for the storage capacitor, using transparent conductive oxide materials (ITO, IZO, ZnO) that combine both optical transparency and electrical conductivity properties. This composite approach enables the storage capacitor to fulfill both electrical storage function and optical transparency requirement, resolving the contradiction between ease of manufacture and aperture ratio
2Reliability
If the storage capacitor area is increased to improve display performance, then the capacitance and holding ability are enhanced, but the non-opaque region area is reduced leading to lower aperture ratio
Solution Approach 1:
The patent changes the optical parameter (transparency) of the storage capacitor plate from opaque to transparent by selecting specific transparent conductive materials such as ITO, IZO, or ZnO, while maintaining the electrical conductivity function. This allows the storage capacitor to be visually transparent, increasing the aperture ratio without compromising manufacturability through conventional sputtering or atomic layer deposition processes
Solution Approach 2:
The patent employs composite material structures for the storage capacitor, using transparent conductive oxide materials (ITO, IZO, ZnO) that combine both optical transparency and electrical conductivity properties. This composite approach enables the storage capacitor to fulfill both electrical storage function and optical transparency requirement, resolving the contradiction between ease of manufacture and aperture ratio
Data Source
AI summary
Provided is a display substrate. The display substrate includes a base substrate, and a pixel unit disposed on the base substrate. The pixel unit includes a storage capacitor, the storage capacitor includes a first plate and a second plate facing each other, and a plate of the storage capacitor is a transparent plate. The pixel unit further includes an active layer and a source/drain pattern, which are disposed in two different layers.