Power Bus Line Voltage Drop Reduction in Display Panels
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Solution Overview
Problem
Display panels face challenges in efficiently distributing driving voltage to pixels due to high resistance in electrode voltage lines, leading to increased IR drops and reduced display quality, especially when the transmission area is large.
Innovation Solution
The display panel incorporates a power bus line with lower resistance than electrode voltage lines, connected to second driving voltage lines, and extends in a direction parallel to the first power supply line, reducing IR drops by distributing voltage uniformly across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode voltage lines are used to distribute driving voltage, then voltage distribution is achieved, but high resistance causes increased IR drops and reduced display quality
Solution Approach 1:
The voltage distribution network is segmented into multiple paths: electrode voltage lines for general distribution and power bus lines for supplementary voltage delivery. This segmentation allows each line type to be optimized for its specific function, with power bus lines having lower resistance to minimize IR drops in critical areas.
Solution Approach 2:
Power bus lines act as intermediary elements between the power supply and the electrode voltage lines. These power bus lines with lower resistance serve as mediators that reduce voltage loss before voltage reaches the electrode lines, thereby improving overall voltage distribution quality.
2Area of stationary object
If transmission area is increased, then display area is improved, but voltage distribution uniformity deteriorates due to higher resistance
Solution Approach 1:
The large transmission area is served by multiple distributed power bus lines rather than a single voltage line. This segmentation of the voltage distribution network ensures that no single line has to span the entire transmission area, reducing the effective resistance path and maintaining voltage uniformity across the expanded display region.
Solution Approach 2:
The voltage distribution network transitions from a two-dimensional planar layout to a three-dimensional multi-layer structure. Power bus lines are positioned at different layers and depths, creating a volumetric distribution network that reduces resistance paths and improves voltage uniformity across large transmission areas.
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 enhances the uniformity of driving voltage distribution, reducing IR drops and improving display quality by minimizing voltage loss across the transmission area, thereby increasing the utilization of non-display areas.
Implementation Method 1
a power bus line connected to the plurality of second driving voltage lines in the first non-display area or the second non-display area, the power bus line extending in the first direction
Implementation Method 2
A length of the power bus line in the first direction is less than a length of the first power supply line in the first direction
Data Source
AI summary
A display panel includes a substrate including a first non-display area surrounding a transmission area, a display area on an outer portion of the first non-display area, and a second non-display area surrounding the display area, driving thin film transistors and display elements in the display area, a first power supply line in the second non-display area and extending in a first direction, first driving voltage lines and second driving voltage lines extending in a second direction intersecting with the first direction and spaced apart from each other with the transmission area therebetween, and a power bus line connected to the second driving voltage lines in the first non-display area or second non-display area, the power bus line extending in the first direction. A length of the power bus line in the first direction is less than a length of the first power supply line in the first direction.