Molybdenum Data Lines in LCD Substrates for Resistance Control
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the overetching of metal thin films during the manufacturing process leads to metal lines with increased electrical resistance, deteriorating image display quality, especially in highly integrated arrays where the width of metal lines is reduced, causing increased electrical resistance and potentially decreasing image quality.
Innovation Solution
A substrate for LCD devices is designed with an insulating substrate, data lines, and pixel electrodes, where the data lines are made of molybdenum to reduce electrical resistance, and an active pattern is formed between the data lines and pixel electrodes to minimize electromagnetic interference, allowing for a wider data line width and simplified manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of metal lines is reduced to increase integration density, then the integration density is improved, but the electrical resistance of metal lines is increased
Solution Approach 1:
The patent changes the material parameter of metal lines from conventional materials to molybdenum, which has superior electrical conductivity. This allows maintaining lower electrical resistance even when line width is reduced for higher integration density, thus resolving the contradiction between integration density and electrical resistance
Solution Approach 2:
The patent employs a composite structure where molybdenum is combined with specific insulating materials and active patterns. This composite approach optimizes both electrical performance and integration density by leveraging the complementary properties of different materials in the display device structure
2Ease of manufacture
If overetching is performed during manufacturing, then the etching process is simplified, but the metal line width is reduced causing increased electrical resistance
Solution Approach 1:
The patent introduces an active pattern as a cushioning layer between the metal line and the etching process. This active pattern absorbs the overetching effect, preventing the etchant from excessively removing the metal line material, thus maintaining precise metal line width even when simplified overetching processes are used
3Productivity
If the width of metal lines is reduced for high integration, then the integration density is improved, but the image display quality is deteriorated
Solution Approach 1:
The patent changes the electrical parameter of metal lines by using molybdenum material, which maintains low electrical resistance even at reduced widths. This ensures that signal transmission quality and image display quality are preserved despite the reduced metal line width required for high integration density
Solution Approach 2:
The active pattern serves as a cushioning structure that protects the metal lines from overetching and maintains their dimensional stability. This ensures consistent electrical performance and image display quality across highly integrated display devices
Data Source
AI summary
A substrate for a display device includes an insulating substrate, a data line, an insulating layer and a pixel electrode. The insulating substrate has a switching element. The data line is formed on the insulating substrate to be electrically connected to a first electrode of the switching element. The insulating layer is formed on the insulating substrate having the switching element and the data line. The insulating layer has a contact hole through which a second electrode of the switching element is partially exposed and a groove adjacent to the data line. The pixel electrode is formed on the insulating layer to be electrically connected to the second electrode through the contact hole. Therefore, an image display quality may be improved, and a manufacturing cost of the LCD device may be reduced.