Display Device Conductive Lines for Voltage Uniformity
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Solution Overview
Problem
Conventional display devices operating in FFS mode face issues with uneven voltage distribution across the common electrode, leading to reduced display quality due to a limited number of conductive lines, which affects the uniformity of voltage application across the common electrode.
Innovation Solution
The display device incorporates conductive lines that are adjacent to and electrically connected to the common electrode, with these lines having common portions that maintain a consistent positional relation relative to the pixel lines, ensuring even voltage distribution and reducing the impact of parasitic capacitance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of conductive lines is reduced, then device complexity is lowered, but voltage distribution uniformity deteriorates
Solution Approach 1:
The common electrode is divided into multiple regions, each served by dedicated conductive lines. This segmentation allows voltage to be distributed uniformly across the entire common electrode by ensuring each region receives appropriate voltage through its own conductive lines, resolving the contradiction between reducing overall complexity and maintaining voltage uniformity.
Solution Approach 2:
Different regions of the common electrode are assigned different conductive line configurations based on their specific voltage distribution requirements. This local quality approach ensures that each region receives the appropriate voltage distribution, maintaining overall uniformity while allowing for regional optimizations that reduce total complexity.
2Manufacturing precision
If conductive lines are positioned closer to pixel electrodes, then voltage distribution improves, but parasitic capacitance increases
Solution Approach 1:
An insulating layer is introduced between the conductive lines and the pixel electrodes. This intermediary insulating layer allows the conductive lines to be positioned close to the pixel electrodes for improved voltage distribution while preventing direct electrical contact that would create parasitic capacitance, thus resolving the contradiction between proximity for voltage uniformity and distance for capacitance reduction.
Data Source
AI summary
A display device includes pixel electrodes, a common electrode, switching components, pixel lines, and conductive lines. The common electrode overlaps the pixel electrodes via an insulator. The switching components are connected to the pixel electrodes. The pixel lines are connected to the switching components and disposed adjacent to the pixel electrodes. The conductive lines are adjacent to the pixel electrodes on a side on which the pixel lines are disposed. The conductive lines are separated from each other and electrically connected to the common electrode. The conductive lines include common portions having a common positional relation relative to the pixel lines, respectively.