Organic Light Emitting Display Power Line Segmentation
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Solution Overview
Problem
The existing organic light emitting display devices face issues with shorts and IR drops between lines due to increased width of power lines, leading to reduced yield and non-uniform image quality, as wider lines increase the likelihood of line shorts and foreign matter-induced defects.
Innovation Solution
The design incorporates shared first power lines and initial power lines arranged in a mesh structure, with horizontal and vertical configurations that reduce line resistance and overlap, allowing for increased power line width while minimizing the risk of shorts, using materials and layers similar to gate and data lines to ensure efficient voltage distribution and reduced IR drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of power lines is increased to reduce IR drop and improve image quality uniformity, then the image quality uniformity is improved, but the likelihood of shorts between lines increases
Solution Approach 1:
The power line system is segmented into multiple separate lines (first power lines and initial power lines) with different functions. The first power lines supply driving voltage while the initial power lines supply initialization voltage, distributing the power delivery function across multiple independent pathways to reduce the required width of each individual line and thereby reduce short risk.
Solution Approach 2:
The initial power lines act as intermediary elements between the data lines and the sub-pixels, providing a separate initialization voltage pathway. This intermediary structure allows the first power lines to be optimized for driving voltage without needing to handle both initialization and driving functions, reducing the current load and width requirements.
2Reliability
If the width of power lines is increased to reduce resistance and minimize IR drop, then the IR drop is reduced, but the possibility of short between lines due to foreign matter increases
Solution Approach 1:
The power delivery function is segmented across multiple narrower lines (first power lines for driving voltage, initial power lines for initialization voltage) rather than using fewer wider lines. This segmentation maintains sufficient current carrying capacity through multiple pathways while reducing the width of each individual line, thereby reducing the target area for foreign matter-induced shorts.
Solution Approach 2:
Multiple power line functions (driving voltage supply and initialization voltage supply) are merged into a coordinated system of interconnected first power lines and initial power lines. This merging allows the system to achieve the reliability of wide lines through the combined capacity of multiple narrower lines, reducing IR drop collectively while minimizing individual line short risks.
3Reliability
If the width of power lines is increased to improve image quality uniformity, then the image quality uniformity is improved, but the yield of the display device is reduced due to increased short and dark spot defects
Solution Approach 1:
The power line network is segmented into functionally distinct first power lines and initial power lines, creating a more complex but more reliable structure. This segmentation reduces the width of individual lines and minimizes defects, thereby improving yield while maintaining image quality uniformity through the coordinated operation of multiple lines.
Solution Approach 2:
The electrical parameters (voltage levels, current paths) are changed by introducing separate initialization voltage pathways through initial power lines. This parameter change allows optimization of the driving voltage delivery through first power lines without requiring excessive width, improving both image quality uniformity and manufacturing yield.
Data Source
AI summary
There is provided an organic light emitting display device for preventing short and voltage drop between lines to improve yield. The organic light emitting display device includes: a plurality of sub-pixels located at crossing regions of a plurality of gate lines and a plurality of data lines; first power lines for supplying a voltage for driving the sub-pixels, each of the first power lines being shared by two adjacent sub-pixels from among the plurality of sub-pixels; and initial power lines for supplying an initial power to the sub-pixels, each of the initial power lines being shared by the two adjacent sub-pixels and located between the two adjacent sub-pixels.