Electroluminescence Display Drive Current Line Slit Structure
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Solution Overview
Problem
In organic electroluminescence display devices, the placement of input terminals for drive power supply on one side leads to significant potential differences along the display region, causing variations in light emission intensity and degradation of display quality due to uneven current distribution through power supply lines.
Innovation Solution
The implementation of a drive current line structure with a branch line for each column, a trunk line along the row direction, and a connection line that overlaps with the trunk line, forming a slit to balance potential drops and ensure uniform current supply, reducing variations in light emission intensity across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the input terminal for drive power supply is placed on one side of the panel, then the device structure is simplified and easier to manufacture, but significant potential differences occur along the horizontal scan direction causing variations in light emission intensity
Solution Approach 1:
The drive current line is divided into multiple independent branch lines, each extending from the input terminal to pixels in different column regions. This segmentation allows current to be distributed more uniformly across the display panel, reducing potential differences and maintaining consistent light emission intensity across different pixel regions.
2Device complexity
If a single power supply line structure is used, then the device complexity is reduced, but potential drop variations occur causing uneven current distribution through power supply lines
Solution Approach 1:
The power supply line structure is segmented into multiple branch lines that independently supply current to different pixel columns. This segmentation reduces the total current load on each individual branch, minimizing potential drops and ensuring reliable, uniform current distribution across all pixels despite the simplified overall structure.
3Length of moving object
If the connection line is placed close to the terminal, then the line length is minimized reducing resistance, but potential drop variations occur along the horizontal scan direction
Solution Approach 1:
Instead of using a single long connection line that causes potential drop variations, the system uses multiple shorter branch lines that diverge from the terminal. Each branch line serves a specific column region, minimizing the distance and resistance for current delivery to each region while maintaining uniform potential distribution across the entire display panel.
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 configuration minimizes potential drop differences and maintains light emission brightness at 70% or greater across the display, ensuring consistent display quality by uniformly distributing drive current regardless of distance from the external terminal.
Implementation Method 1
an organic electroluminescence element (hereinafter referred to as 'organic EL element'), as a display element in each pixel
Data Source
AI summary
A display portion in which pixels are arranged in a matrix is formed on a display panel and a drive current line, which supplies a drive current from a terminal formed at a side along a column direction to a display element in each pixel, includes a branch line provided for each column of the display portion and along each column of the display portion; a trunk line to which the branch line is connected and which extends along a row direction at a peripheral portion at a lower side of the display portion; and a connection line which connects the trunk line and the terminal. The connection line is separated from a region of the trunk line near the terminal by a slit provided from a side of the trunk line near the terminal to a side of the trunk line distanced from the terminal and extends in parallel to the region of the trunk line near the terminal at the peripheral portion at the lower side of the display portion from a region in which the terminal is formed. The connection line is connected to the trunk line at an intermediate position of the peripheral portion at the lower side of the display portion along the row direction. A length of the slit and a width of the region of the trunk line near the terminal are optimized to inhibit brightness variation within the display portion.