Display Driving Voltage Lines Grid Segmentation
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Solution Overview
Problem
Display devices, particularly OLEDs, face issues with luminance uniformity due to increased resistance in driving voltage supply wires, which can occur when the length or width of these wires is altered, leading to voltage drops and current density changes.
Innovation Solution
The design incorporates a first and second driving voltage transmission line with overlapping driving voltage connection lines, arranged in a specific pattern to reduce resistance, and uses a common voltage supply line that surrounds the display area to minimize load effects, with certain data connection lines made of molybdenum-based metals for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length or width of driving voltage supply wires is increased or decreased, then the resistance changes, but luminance uniformity deteriorates
Solution Approach 1:
The driving voltage supply wire is divided into multiple segments (first driving voltage transmission line, second driving voltage transmission line, and multiple driving voltage connection lines) arranged in a grid pattern. This segmentation allows the total resistance to be distributed across multiple paths, reducing the voltage drop and improving luminance uniformity across the display panel.
Solution Approach 2:
Multiple driving voltage connection lines are introduced as intermediary conductors between the first and second driving voltage transmission lines. These connection lines provide additional current paths and reduce the overall resistance, thereby minimizing voltage drop and maintaining consistent luminance across the display area.
2Loss of energy
If the wire dimensions are altered to reduce resistance, then current density changes, but voltage drop increases
Solution Approach 1:
Instead of increasing the width of a single wire, the solution segments the wire into multiple narrower transmission lines connected by numerous connection lines. This maintains acceptable current density in each individual wire while providing multiple parallel paths that reduce total resistance and voltage drop.
Solution Approach 2:
The wire configuration transitions from a simple linear or planar arrangement to a three-dimensional grid structure with transmission lines and connection lines intersecting at multiple levels. This dimensional change allows current to flow through multiple spatial paths, reducing resistance without requiring any single wire to be excessively wide.
3Loss of energy
If multiple transmission lines are added to reduce resistance, then device complexity increases, but manufacturing becomes more difficult
Solution Approach 1:
The driving voltage transmission lines and connection lines are designed to serve multiple functions: they provide voltage supply, act as structural support, and can be integrated with other display components. This multi-functionality reduces the need for separate dedicated structures, simplifying manufacturing despite the increased number of conductive elements.
Solution Approach 2:
The multiple driving voltage transmission lines and connection lines are merged into a unified grid structure that is manufactured as an integrated conductive network. This merging allows for standardized fabrication processes where all lines are created simultaneously using the same material deposition and patterning techniques, reducing manufacturing complexity.
Data Source
AI summary
A display device includes a display panel including a display area and a peripheral area, a plurality of data lines and a plurality of driving voltage lines provided in the display area, a plurality of data connection lines provided in the peripheral area and connected to the plurality of data lines, a first driving voltage transmission line provided in the peripheral area and overlapping the plurality of data connection lines, a second driving voltage transmission line provided in the peripheral area and disposed between the first driving voltage transmission line and the display area, and a plurality of driving voltage connection lines. The plurality of driving voltage connection lines are connected to the first driving voltage transmission line and the second driving voltage transmission line, and provided between the first driving voltage transmission line and the second driving voltage transmission line.