Display Device Data Line Projecting Portion Parasitic Capacitance
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Solution Overview
Problem
The close spacing of signal lines in display devices leads to noise, data coupling, and interference, which can result in display failures such as horizontal line stains due to parasitic capacitance and coupling between data and initialization voltage lines.
Innovation Solution
The implementation of data lines with projecting portions bent away from power lines and the use of a shield member disposed vertically between power and data lines to reduce parasitic capacitance and prevent coupling, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal lines are spaced closely to reduce device size and increase resolution, then productivity and pixel density are improved, but parasitic capacitance and signal coupling increase causing display failures
Solution Approach 1:
The data line is configured with a projecting portion that extends in a direction away from the power line, changing the spatial arrangement from a simple parallel layout to a three-dimensional configuration with vertical separation. This dimensional change reduces parasitic capacitance while maintaining close spacing for high pixel density.
Solution Approach 2:
The data line is segmented into different portions with different orientations: a first portion extending in a first direction and a projecting portion extending in a second direction away from the power line. This segmentation allows the line to maintain connectivity while reducing coupling in critical areas.
2Area of stationary object
If data lines are routed close to power lines for compact layout, then area is reduced, but coupling between data signal and initialization voltage occurs causing horizontal line stains
Solution Approach 1:
The projecting portion of the data line extends vertically away from the power line in the third direction, creating spatial separation that prevents coupling between data signals and initialization voltage while maintaining compact horizontal layout for small display area.
Solution Approach 2:
The projecting portion acts as an intermediary structure that physically separates the data line from the power line, preventing direct coupling while maintaining the compact layout required for small display areas.
3Reliability
If shield member is added to prevent coupling between power and data lines, then display quality is improved, but device complexity increases
Solution Approach 1:
Instead of adding a separate shield member, the solution extracts and utilizes the existing insulation layer between conductive layers as the shielding mechanism, simplifying the structure while maintaining display quality.
Solution Approach 2:
The insulation layer serves multiple functions: electrical insulation between conductive layers and shielding against parasitic capacitance and signal coupling, eliminating the need for dedicated shield members and reducing device complexity.
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 solution effectively reduces parasitic capacitance and coupling between signal lines, preventing display failures like horizontal line stains and improving display quality by minimizing noise and interference.
Implementation Method 1
a shield member may be disposed vertically between the power line or member that delivers the initialization voltage and the data line(s). The shield member shields the data line(s) and the active pattern.
Implementation Method 2
the first data line includes a projecting portion that extends in a direction away from the connection member... such that the parasitic capacitance can be reduced and coupling between the initialization voltage and the data signal can be prevented
Data Source
AI summary
A display device according to an exemplary embodiment of the invention includes: a substrate; an active pattern including a semiconductor material disposed on the substrate; a first conductive layer disposed on the active pattern, the first conductive layer including a plurality of scan lines and a driving gate electrode; a second conductive layer disposed on the first conductive layer, the second conductive layer including an initialization voltage line to transmit an initialization voltage; a third conductive layer disposed on the second conductive layer, the third conductive layer including a driving voltage line to transmit a driving voltage; a fourth conductive layer disposed on the third conductive layer, the first conductive layer including a first data line that transmits a data signal; and a pixel electrode layer disposed on the fourth conductive layer, the pixel electrode layer including a plurality of pixel electrodes, wherein the third conductive layer includes a connection member that is electrically connected with the initialization voltage line, and the first data line includes a projecting portion that extends in a direction away from the connection member.