Pixel Circuit Coupling for Stable Holding Capacitance in LCDs
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Solution Overview
Problem
In liquid crystal devices, the potential difference between shield layers fluctuates, leading to changes in holding capacitance and potential operating failures such as display unevenness due to the influence of scanning and data lines.
Innovation Solution
The electro-optical device incorporates a pixel circuit portion with a scanning line, data line, constant potential lines, and a transistor, along with a coupling portion that electrically couples the constant potential lines to stabilize the potential difference and reduce fluctuations, thereby maintaining consistent capacitance across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shield layers are provided for data lines and scanning lines to prevent potential fluctuations, then holding capacitance is secured, but potential difference between shield layers fluctuates from pixel to pixel causing display unevenness
Solution Approach 1:
The patent applies equipotentiality by connecting both the first shield layer and second shield layer to the same reference potential through separate connection portions. This ensures that both shield layers maintain equal potential relative to the pixel electrode, eliminating potential differences between them and preventing display unevenness while maintaining stable holding capacitance.
2Object-affected harmful factors
If individual shield layers are used for scanning and data lines, then potential protection is provided, but potential difference fluctuates due to individual influences from lines
Solution Approach 1:
By connecting both shield layers to the same reference potential, the patent eliminates the harmful effect of individual potential fluctuations from scanning and data lines. The equipotential connection ensures that both shield layers respond uniformly to line influences, maintaining stable operating conditions and preventing display failures.
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.