Circular OLED Power Line Bridge Network for Luminance Uniformity
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Solution Overview
Problem
Display devices with circular organic light emitting diode (OLED) displays experience luminance deviation due to resistance differences in pixel power lines, leading to uneven brightness across the circular display area.
Innovation Solution
The design includes a substrate with a circular arc portion and a driving circuit connecting portion, featuring a driving power supply line that surrounds the display area and bridge lines connecting power lines to maintain equipotentiality, reducing bezel width and minimizing luminance deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel power lines are extended to cover the circular display area, then the display area is increased, but resistance deviation occurs due to length differences causing luminance deviation
Solution Approach 1:
The pixel power lines are divided into multiple segments with different lengths, where each segment serves a specific region of the circular display area. This segmentation allows optimization of line lengths for different zones, reducing overall resistance deviation while maintaining comprehensive coverage of the circular display area.
Solution Approach 2:
Different regions of the circular display area are assigned different power line configurations based on their specific requirements. The local quality principle allows tailoring the power line characteristics (length, width, material) to match the local luminance requirements, ensuring uniform brightness across the entire circular display while accommodating varying current demands in different zones.
2Manufacturing precision
If the circular display portion is made smaller to reduce resistance deviation, then luminance uniformity is improved, but the display device loses its circular design advantage and becomes less distinctive
Solution Approach 1:
The power line design transitions from a two-dimensional planar layout to a three-dimensional configuration by routing lines through multiple layers and utilizing vertical space. This dimensional change allows the power lines to reach distant pixels without excessive length in the planar view, maintaining both the full circular display area and luminance uniformity through spatial optimization.
Solution Approach 2:
Bridge lines are introduced as intermediary conductors that connect different power line segments and distribute voltage more evenly across the circular display area. These bridge lines act as mediators that compensate for resistance deviations in the main power lines, enabling the full circular display to maintain uniform luminance without reducing the display area.
3Manufacturing precision
If bridge lines are added to connect power lines, then luminance deviation is reduced, but device complexity increases
Solution Approach 1:
The bridge lines are merged with the existing power line structure by integrating them into the same conductive layer or by using the same material system. This merging approach reduces the overall complexity by eliminating the need for entirely separate bridge line structures, while still achieving the voltage equalization function across the circular display area.
Solution Approach 2:
The power lines are designed to serve multiple functions simultaneously: they provide the primary current path to pixels, act as voltage reference lines, and function as bridge lines for voltage equalization. This multi-functionality reduces the need for separate dedicated bridge line structures, thereby reducing device complexity while maintaining luminance uniformity.
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 luminance deviation and picture quality issues caused by power line length variations, while achieving a thin bezel width and reliable operation for circular OLED displays.
Implementation Method 1
the organic light emitting diode of each of a plurality of pixels arranged in the circular display portion emits light through a current corresponding to a data signal supplied from pixel power lines
Data Source
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AI summary
An organic light emitting diode (OLED) display device includes a substrate (110) including a circular arc portion (111) and a driving circuit (130) connecting portion connected to the top of the circular arc portion. The circular arc portion is substantially circular around a center point. A display area (120) is formed in the circular arc portion. The display area has a circular shape centered around the center point. A driving power supply line (150) is formed in the circular arc portion and configured to provide a driving voltage for OLED pixels of the OLED display device. The driving power supply line formed to at least partially surround the display area. A number of power lines (PL) electrically connect the driving power supply line to the OLED pixels. A number of bridge lines (BL) are formed outside of the display area, where each bridge line connecting one of the power lines with at least one adjacent power line.