Liquid Crystal Device Gate Overlap Adjustment
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Solution Overview
Problem
Existing electro-optical devices face display irregularities in the form of streaks due to uneven parasitic capacitance along data lines, which affects the uniformity and quality of the display.
Innovation Solution
The electro-optical device incorporates transistors with varying overlapping amounts of gate electrodes and data lines via insulation films, allowing for differential parasitic capacitance adjustment to reduce display irregularities by ensuring uniform potential distribution across pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gate electrode and data line are overlapped via insulation film to adjust parasitic capacitance, then display uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by creating different overlapping amounts between the gate electrode and data line at different locations. Specifically, the overlapping amount is varied along the data line to compensate for position-dependent parasitic capacitance variations, thereby achieving uniform display characteristics across the display panel without requiring complete structural redesign
Solution Approach 2:
The patent introduces asymmetry by deliberately designing unequal overlapping amounts between the gate electrode and data line. Instead of symmetric or uniform overlapping, the overlapping amount is asymmetrically adjusted to counterbalance the asymmetric parasitic capacitance distribution that naturally occurs in the wiring structure, thus resolving the display uniformity issue
2Stability of the object's composition
If the overlapping amount of gate electrode and data line is varied, then parasitic capacitance uniformity is improved, but manufacturing precision control becomes more difficult
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-designing the required overlapping amounts at different locations before manufacturing. The optimal overlapping amount distribution is determined in advance based on the expected parasitic capacitance variations, allowing manufacturing processes to follow a predetermined pattern rather than requiring complex real-time adjustments, thus simplifying manufacturing precision control
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 configuration effectively minimizes display irregularities as streaks, enhancing the overall display quality and uniformity by alleviating differences in parasitic capacitance between data lines, resulting in an improved appearance and manufacturing efficiency.
Implementation Method 1
the overlapping amount where a gate electrode of the first transistor and the first data line overlap via an insulation film and the overlapping amount where a gate electrode of the second transistor and the second data line overlap via an insulation film are different
Data Source
AI summary
A liquid crystal device as an electro-optical device includes an image signal line which is supplied with an image signal, a data line, and sampling transistors (S-TFT) as first and second transistors which are electrically connected between the data line and the image signal line and supply the image signal to the data line, where at least two types of S-TFTs are provided so that the overlapping amounts where gate electrodes of the S-TFTs and first data line overlap are different. Due to this, parasitic capacitance occurs between the gate electrode and the data line, it is possible to adjust the structural parasitic capacitance of each data line by the overlapping amounts being different, and it is possible to improve the display irregularities in series as streaks.