OLED Display Substrate Secondary Signal Line IR Drop Compensation
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Solution Overview
Problem
The IR drop in power source signal lines of OLED display devices leads to uneven power distribution across different areas, affecting the brightness and display quality.
Innovation Solution
The display substrate is designed with secondary signal lines of varying lengths and widths, where resistance per unit length decreases with increasing total length, ensuring consistent voltage delivery to pixel units, and includes a dummy electrode pattern for thickness uniformity, improving brightness uniformity and display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If power source signal lines are extended to supply power to pixel units across the display substrate, then power delivery coverage is improved, but voltage drop (IR drop) increases leading to uneven power distribution
Solution Approach 1:
The patent applies local quality by making different secondary signal lines have different widths based on their specific positions and length requirements. Longer secondary signal lines (which experience greater IR drop) are designed with larger widths to reduce resistance, while shorter lines have smaller widths. This localized differentiation of signal line properties ensures uniform voltage delivery across different regions of the display substrate.
Solution Approach 2:
The patent changes the geometric parameters (width and length) of the secondary signal lines to compensate for resistance variations. By carefully selecting different widths for different secondary signal lines based on their lengths and positions, the patent optimizes the resistance values to maintain consistent voltage delivery across all pixel units while extending power coverage.
2Reliability
If secondary signal lines are made wider to reduce resistance, then voltage uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the power delivery system into multiple secondary signal lines with distinct width specifications based on their positions and lengths. Each secondary signal line is designed with a specific width appropriate to its requirements, allowing the manufacturing process to produce different line widths through standardized patterning techniques. This segmentation approach manages complexity by breaking down the overall design into manageable, individually-optimized segments.
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 design reduces voltage differences across the display substrate, enhancing brightness uniformity and overall display quality by controlling resistance values and line dimensions, and maintaining consistent power delivery to sub-pixels of different colors.
Implementation Method 1
resistance values per unit length of different secondary signal lines along the first direction decrease as total lengths of the secondary signal lines increase
Data Source
AI summary
A display substrate includes a plurality of pixel units arranged to form a plurality of pixel columns extending along a first direction, the display substrate further includes a plurality of groups of power source signal lines and pixel driving circuits located on the substrate, each group of power source signal lines includes a plurality of secondary signal lines, the pixel driving circuits of the pixel units in each pixel column are connected to different secondary signal lines in a same group of power source signal lines, each secondary signal line extends along the first direction from a starting end of the power source signal lines, extension lengths of the secondary signal lines in the same group of power source signal lines are different, and resistance values per unit length of different secondary signal lines along the first direction decrease as total lengths of the secondary signal lines increase.