IGZO Electrode Integration for LCD Fabrication
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Solution Overview
Problem
The complexity and cost of the fabrication process for liquid crystal display (LCD) devices are increased due to the need for multiple masks in the manufacturing process, which complicates the production and increases costs.
Innovation Solution
A display device design where at least one of the source electrode and drain electrode of the switching element is unitary with the first pixel electrode, all made from the same semiconductor material, such as indium gallium zinc oxide (IGZO), and sharing the same thickness, with impurity injection using a single mask process to simplify the fabrication and reduce the number of masks required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple masks are used in the fabrication process to form source electrode, drain electrode, and pixel electrode separately, then the manufacturing precision and electrode structure control are improved, but the device complexity and fabrication cost increase
Solution Approach 1:
The source electrode, drain electrode, and pixel electrode are merged into a single unitary structure formed from one continuous semiconductor material layer (IGZO). This single integrated structure is patterned using only one mask during fabrication, eliminating the need for multiple separate electrode formation processes while maintaining precise structural control through the unified design.
Solution Approach 2:
The unitary electrode structure serves multiple functions simultaneously: it acts as the source electrode, drain electrode, and pixel electrode for the LCD device. This multi-functional design allows a single structure to fulfill the roles that traditionally required three separate components and three separate fabrication masks.
2Manufacturing precision
If multiple masks are used in the fabrication process, then the electrode patterning precision is improved, but the productivity and fabrication efficiency decrease
Solution Approach 1:
The fabrication process merges the formation of source electrode, drain electrode, and pixel electrode into a single patterning step using one mask. This consolidation reduces the number of fabrication cycles while maintaining precise electrode patterning through the unified pattern design, thereby improving overall fabrication efficiency.
Solution Approach 2:
The unitary electrode structure is designed and formed in advance as a single integrated component before any subsequent fabrication steps. This preliminary formation of the complete electrode structure in one step prevents the need for multiple later patterning operations, streamlining the entire fabrication process.
3Reliability
If separate materials are used for source electrode, drain electrode, and pixel electrode, then the electrical performance of each electrode is optimized, but the manufacturing cost and process complexity increase
Solution Approach 1:
The source electrode, drain electrode, and pixel electrode are all formed from the same homogeneous semiconductor material (IGZO). This material uniformity simplifies the manufacturing process by eliminating the need for multiple material deposition steps and reduces costs associated with handling and processing different materials, while the electrical performance is optimized through impurity injection.
Solution Approach 2:
The electrical performance of the unitary electrode structure is optimized by changing the impurity concentration in specific regions through selective impurity injection. By varying the impurity parameters (concentration and distribution) rather than changing materials, the electrode achieves optimal electrical characteristics while maintaining manufacturing simplicity.
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
This approach simplifies the fabrication process, reduces costs, and enhances the conductivity of the electrodes while maintaining transparency, thereby improving the efficiency and aperture ratio of the LCD device.
Implementation Method 1
Each of the source electrode, the drain electrode, and the first pixel electrode may include a greater amount of impurities than an amount of impurities included in the semiconductor layer
Data Source
AI summary
A display device and a method of fabricating the display device may simplify a fabrication process and reduce fabrication cost. The display device includes: a substrate; a gate line and a data line on the substrate; a switching element connected to the gate line and the data line, the switching element including a source electrode and a drain electrode; and a first pixel electrode connected to the switching element. At least one of the source electrode and the drain electrode of the switching element includes substantially a same material as a material included in the first pixel electrode.