Liquid Crystal Display Common Line and Spacer Configuration
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Solution Overview
Problem
Liquid crystal display devices experience color mixing issues due to light leakage between adjacent pixel regions, particularly noticeable when viewed from an angle, caused by the arrangement of light blocking layers and spacers in the display structure.
Innovation Solution
The solution involves modifying the location of common lines to increase the number of spacers and seat regions without including them on the common lines, achieved by reducing the number of common lines and introducing dummy lines that are electrically connected to the common electrode, thereby maintaining the cell gap and reducing image noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of spacers and seat regions is increased to reduce color mixing, then image consistency is improved, but the number of common lines must be reduced which complicates the electrical connection structure
Solution Approach 1:
The patent divides the common line structure into two types: actual common lines that carry voltage signals and dummy lines that provide structural support for spacers. This segmentation allows the system to increase the number of spacers for better image consistency while maintaining the necessary electrical connections through the distributed common lines.
Solution Approach 2:
Dummy lines act as intermediaries between the common electrode and the spacer structures. Although dummy lines do not carry voltage signals, they provide the necessary structural framework for positioning spacers, thereby mediating between the electrical connection requirements and the mechanical support needs.
2Object-affected harmful factors
If common lines are removed from certain areas to increase spacer placement options, then color mixing is reduced, but the electrical connection structure becomes more complex
Solution Approach 1:
The patent extracts the electrical connection function from all line structures by introducing dummy lines that do not carry voltage. This allows common lines to be selectively removed or repositioned in areas where they would interfere with spacer placement, thereby reducing color mixing while maintaining electrical connections through the remaining common lines and the common electrode.
Solution Approach 2:
Dummy lines serve as structural copies of common lines, providing the same mechanical support and spacer positioning functions without carrying electrical signals. This copying approach allows the system to maintain the beneficial structural arrangement of multiple lines while eliminating the harmful electrical interference that would cause color mixing.
3Reliability
If dummy lines are introduced to maintain common electrode voltage without common lines, then image noise is reduced, but the device structure becomes more complex
Solution Approach 1:
Dummy lines act as intermediaries that provide structural support for spacers while allowing the common electrode to maintain its voltage potential through alternative electrical pathways. This mediation enables the system to achieve better image quality by reducing color mixing while managing the increased structural complexity through functional differentiation.
Data Source
AI summary
A display device includes a first substrate and a second substrate facing the first substrate. A plurality of spacers is disposed between the first and second substrates. The first substrate includes a plurality of gate lines extending in a row direction, a plurality of data lines extending in a column direction, and a plurality of pixel electrodes. A first insulator covers the plurality of gate lines. A semiconductor layer is formed on the first insulator. A common electrode is formed on the second insulator and faces the plurality of pixel electrodes. A plurality of common lines extend along the plurality of data lines and supply common voltage to the common electrode. A plurality of seat regions are formed in which at least one of the plurality of gate lines, the semiconductor layer, and one of the plurality of data lines overlap to face the plurality of spacers.