OLED Display Grid Structure for Uniform Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OLED display panels, non-uniform brightness occurs due to varying voltage values along power lines, with positions closer to the driving chip having higher voltage and those further away having lower voltage, resulting in inconsistent brightness across the display screen.
Innovation Solution
A grid structure formed by intersecting first and second power lines is implemented, with grid density increasing further away from the driving chip, which balances resistance and ensures uniform current transmission, thereby maintaining consistent power supply voltages across OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power line is used to supply power from the driving chip to OLEDs, then the structure is simple, but the voltage varies at different positions causing non-uniform brightness
Solution Approach 1:
The power supply system is segmented into multiple first power lines and second power lines that form a grid structure, dividing the single power line into multiple parallel paths. This segmentation allows different current paths to reach different OLED regions, enabling independent voltage control and compensating for voltage drops across the display area.
Solution Approach 2:
Different regions of the display panel are provided with different grid densities. Regions farther from the driving chip have higher grid density (more power lines per unit area) to compensate for greater voltage drops, while regions closer to the driving chip have lower grid density. This local quality adjustment ensures uniform voltage distribution across the entire display area.
2Area of stationary object
If power lines are extended further from the driving chip to cover the entire display area, then all OLEDs can be powered, but voltage drop increases causing lower voltage at distant positions
Solution Approach 1:
The extended power line is segmented into multiple shorter segments (first and second power lines forming grids), reducing the length of each individual power line segment. This segmentation minimizes voltage drop in each segment while maintaining coverage of the entire display area through the combined grid network.
Solution Approach 2:
The grid density parameter is changed based on position - higher density farther from the driving chip. This parameter change compensates for increased voltage drop by providing more parallel current paths in regions where voltage would naturally be lower, maintaining voltage stability across the extended area.
3Illumination intensity
If grid density is increased throughout the entire power line structure, then voltage distribution becomes more uniform, but manufacturing complexity and material usage increase
Solution Approach 1:
Instead of uniformly increasing grid density across the entire display panel, the invention applies higher grid density only in specific regions farther from the driving chip where voltage drop is more significant. This local quality approach achieves brightness uniformity while minimizing the overall increase in manufacturing complexity and material usage.
Solution Approach 2:
The grid density parameter is spatially varied rather than kept constant. By changing the density parameter based on distance from the driving chip, the invention achieves effective voltage compensation in critical regions without unnecessarily increasing complexity in regions where voltage is already sufficient.
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
The grid structure ensures uniform power supply voltages to OLEDs, addressing the issue of non-uniform brightness by adjusting grid density and resistance in relation to the distance from the driving chip, resulting in a consistent display screen illumination.
Implementation Method 1
due to the resistance of the power line itself and the charge consumption during light-emitting of the OLED, different positions on the power line has different voltage values
Implementation Method 2
the plurality of first power lines is intersected and connected with the plurality of second power lines to form an integrated grid structure, and the grid structure is electrically connected with anodes of the plurality of OLEDs
Data Source
AI summary
A display panel and a display device, the display panel includes a display area and a peripheral area outside the display area; the display area is provided with OLEDs, first and second power lines; the peripheral area is provided with at least one driving chip; OLEDs are distributed in a matrix; first power lines extend in a first direction, second power lines extend in a second direction, first power lines are intersected and connected with second power lines to form an integrated grid structure electrically connected with anodes of OLEDs; the driving chip is electrically connected with the grid structure; the grid structure includes grids defined by first power lines being intersected with second power lines, the larger a distance of a position of the grid structure away from the driving chip is, the larger a grid density of the position of the grid structure is.