Transparent Capacitor Electrode Layout for High-Aperture Displays
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Solution Overview
Problem
In display devices, increasing the capacitance of capacitors to prolong the alignment of liquid crystal molecules under an electric field is challenging without compromising the aperture ratio, leading to increased power consumption and reduced display quality.
Innovation Solution
A semiconductor device with a capacitor design featuring a light-transmitting semiconductor film, a dielectric film, and a light-transmitting conductive film, where the conductive film is doped to enhance conductivity, allowing for increased charge capacity while maintaining a high aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the area of the light-blocking conductive film is increased to increase the charge capacity of the capacitor, then the capacitance value is improved, but the aperture ratio is lowered and display quality is degraded
Solution Approach 1:
The patent applies the principle of optical property changes by using a light-transmitting conductive film instead of a light-blocking film for the capacitor electrode. This material change allows the film to transmit light while maintaining its electrical conductivity function, thereby increasing the aperture ratio without compromising charge capacity. The conductive film is doped to enhance conductivity while remaining optically transparent.
Solution Approach 2:
The patent changes the optical parameter (light transmission) of the conductive film by doping it to enhance conductivity while maintaining transparency. This parameter change allows the film to simultaneously achieve high conductivity for adequate charge capacity and high light transmission for improved aperture ratio and display quality.
2Ease of manufacture
If one electrode of the capacitor is formed using a semiconductor film, then the manufacturing process is simplified, but the capacitance value becomes lower than predetermined values due to potential issues
Solution Approach 1:
The patent changes the electrical parameter (conductivity) of the semiconductor film through doping. By introducing dopants, the conductivity of the semiconductor film is enhanced to levels sufficient for capacitor electrode function, thereby achieving adequate capacitance values while maintaining the manufacturing simplicity of using semiconductor films.
Solution Approach 2:
The patent uses doping as an intermediary process to transform the semiconductor film from having insufficient conductivity to having adequate conductivity for capacitor function. The dopant acts as a mediator that modifies the electrical properties of the semiconductor material without changing the fundamental manufacturing approach.
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 effectively increases the charge capacity of the capacitor, reducing power consumption and improving display quality by maintaining a high aperture ratio, enabling efficient use of light from backlights in high-resolution displays.
Implementation Method 1
a first light-transmitting conductive film which is provided over the insulating film. The capacitor includes the first light-transmitting conductive film which serves as one electrode... a second light-transmitting conductive film which faces the first light-transmitting conductive film with the insulating film positioned therebetween and functions as the other electrode. The second light-transmitting conductive film is formed over the same surface as the light-transmitting semiconductor film of the transistor and is a metal oxide film containing a dopant.
Data Source
AI summary
A semiconductor device including a capacitor whose charge capacity is increased while improving the aperture ratio is provided. Further, a semiconductor device which consumes less power is provided. A transistor which includes a light-transmitting semiconductor film, a capacitor in which a dielectric film is provided between a pair of electrodes, an insulating film which is provided over the light-transmitting semiconductor film, and a first light-transmitting conductive film which is provided over the insulating film are included. The capacitor includes the first light-transmitting conductive film which serves as one electrode, the insulating film which functions as a dielectric, and a second light-transmitting conductive film which faces the first light-transmitting conductive film with the insulating film positioned therebetween and functions as the other electrode. The second light-transmitting conductive film is formed over the same surface as the light-transmitting semiconductor film of the transistor and is a metal oxide film containing a dopant.