Pixel Circuit Constant-Potential Coupling for Stable LCD Capacitance
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Solution Overview
Problem
In liquid crystal devices, the potential of shield layers varies individually due to the influence of scanning and data lines, leading to fluctuations in holding capacitance between pixels, which can result in display unevenness and operating failures.
Innovation Solution
The electro-optical device incorporates a pixel circuit portion with a scanning line, a data line, first and second constant potential lines, and a transistor, along with a coupling portion that electrically couples the first and second constant potential lines, thereby stabilizing the potential difference between them and reducing fluctuations in holding capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant potential lines are added to couple shield layers, then potential difference stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of potential stabilization and shield layer connection by integrating constant potential lines that serve both to maintain constant potential and to connect shield layers, reducing the need for separate components.
Solution Approach 2:
The constant potential lines perform multiple functions: they maintain constant potential, connect shield layers to ground, and provide a reference potential for both data and scanning lines, making the added structure highly functional and justifying the increased complexity.
Data Source
AI summary
An electro-optical device includes a substrate, a pixel electrode disposed at the substrate, and a pixel circuit portion disposed between the substrate and the pixel electrode. The pixel circuit portion includes a scanning line disposed along a first direction, a data line disposed along a second direction intersecting the first direction, a first constant potential line disposed along the scanning line, a second constant potential line disposed along the data line, and a transistor disposed corresponding to an intersection position of the scanning line and the data line and including a gate electrode electrically coupled to the scanning line, a source region electrically coupled to the data line, and a drain region electrically coupled to the pixel electrode. The pixel circuit portion also includes a coupling portion disposed corresponding to the intersection position and configured to electrically couple the first constant potential line and the second constant potential line.