LCD Pixel Electrode Structure With Shared TFT Semiconductor Film
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Solution Overview
Problem
Conventional liquid crystal display devices with ITO electrodes require multiple manufacturing steps and masks, increasing costs and complexity, while aiming for wide viewing angles and efficient aperture ratios.
Innovation Solution
A liquid crystal display device structure featuring a first electrode with a semiconductor film containing silicon, a second electrode with an opening pattern, and a transistor, where the semiconductor film in the first electrode is formed simultaneously with the transistor, reducing manufacturing steps and costs, and improving aperture ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If both common electrode and pixel electrode are formed of ITO, then the liquid crystal display device can be manufactured with conventional processes, but the number of manufacturing steps and masks increases, leading to higher manufacturing cost
Solution Approach 1:
The patent combines the formation of the first electrode (pixel electrode) and the transistor semiconductor film into a single manufacturing step using a shared semiconductor film layer. This merging eliminates the need for separate ITO electrode formation steps and masks, directly reducing manufacturing complexity and cost while maintaining the required electrical functionality of the pixel electrode
Solution Approach 2:
The semiconductor film serves multiple functions: it acts as both the transistor active layer and the pixel electrode (first electrode). This multi-functionality eliminates the need for dedicated ITO electrode materials and separate formation processes, thereby reducing the total number of manufacturing steps and masks required
2Productivity
If the first electrode is formed separately from the transistor, then the electrode can be optimized for electrical performance, but the manufacturing process becomes more complex with additional steps and masks
Solution Approach 1:
The patent merges the first electrode formation with the transistor semiconductor film formation into a single step. The semiconductor film is patterned to simultaneously create both the transistor structure and the pixel electrode, eliminating sequential processing steps and improving manufacturing efficiency without sacrificing electrical performance
Solution Approach 2:
The semiconductor film is formed preliminarily as a continuous layer before being patterned into the final transistor and electrode structures. This preliminary formation allows subsequent patterning steps to create both components simultaneously, reducing the total number of manufacturing steps required
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 enables the production of liquid crystal display devices with wide viewing angles and low manufacturing costs by simplifying the manufacturing process and enhancing aperture ratios through shared semiconductor film formation.
Implementation Method 1
the first electrode has a semiconductor film containing silicon... the semiconductor film included in the first electrode is formed at the same time as the semiconductor film included in the transistor
Data Source
AI summary
The liquid crystal display device includes an island-shaped first semiconductor film 102 which is formed over a base insulating film 101 and in which a source 102d, a channel forming region 102a, and a drain 102b are formed; a first electrode 102c which is formed of a material same as the first semiconductor film 102 to be the source 102d or the drain 102b and formed over the base insulating film 101; a second electrode 108 which is formed over the first electrode 102c and includes a first opening pattern 112; and a liquid crystal 110 which is provided over the second electrode 108.