Oxide Semiconductor Display Device with Dual Conductive Films
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Solution Overview
Problem
Existing display devices face challenges in reducing the number of laminated films and manufacturing processes while maintaining a high aperture ratio, particularly due to high electric resistance in data lines and limitations in applying transparent conductive films to transmissive liquid crystal displays.
Innovation Solution
The display device configuration includes a gate line, data line, and pixel electrode formed using different conductive films, with an oxide semiconductor layer directly connected to the drain and source electrodes, and a transparent conductive film used for the pixel electrode, reducing the number of laminated films and processes while improving aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the data line and pixel electrode are formed of the same transparent conductive film, then the manufacturing process is simplified, but the electric resistance in the data line becomes high
Solution Approach 1:
The patent segments the conductive film formation into two distinct layers: a first conductive film for the data line and a second conductive film for the pixel electrode. This segmentation allows each layer to be optimized independently - the first conductive film can be designed for low resistance while the second can be transparent, thus resolving the contradiction between manufacturing simplicity and electrical performance.
2Reliability
If an opaque conductive film is used for the data line, then the electric resistance is reduced, but it cannot be applied to transmissive liquid crystal display devices
Solution Approach 1:
The patent employs a composite material structure with two different conductive films. The first conductive film (opaque) provides low electrical resistance for the data line, while the second conductive film (transparent) forms the pixel electrode. This composite approach allows the device to achieve both low resistance and transparency requirements, making it compatible with transmissive liquid crystal display devices.
3Device complexity
If the number of laminated films is reduced, then the manufacturing complexity is decreased, but the aperture ratio may be compromised
Solution Approach 1:
The patent merges the functions of multiple films by having the first and second conductive films serve dual purposes. The first conductive film acts as both the data line and the drain electrode, while the second conductive film serves as both the pixel electrode and the source electrode. This merging reduces the total number of laminated films while maintaining adequate aperture ratio by eliminating redundant layers.
Data Source
AI summary
A display device includes a pixel including: a gate line; a gate insulating film; a substrate; a data line; a pixel electrode; a semiconductor layer formed on the gate line and the gate insulating film; a protective film formed on the data line, the pixel electrode, and the semiconductor layer; and a thin film transistor. A portion of the gate line also serves as a gate electrode of the thin film transistor. A portion of the data line also serves as a drain electrode of the thin film transistor. A portion of the pixel electrode also serves as a source electrode of the thin film transistor. The semiconductor layer is formed of an oxide semiconductor layer. The oxide semiconductor layer is directly connected to the drain electrode and the source electrode, and the data line and the pixel electrode are formed of different conductive films.