OLED Power Signal Structure for Voltage Drop Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OLED display panels suffer from significant VDD voltage drop due to resistance in VDD signal lines, leading to asymmetric brightness and poor brightness uniformity across the display area.
Innovation Solution
A power signal structure is introduced in the OLED display panel, featuring a VDD power cable connected to a driving chip, vertical VDD signal lines, and a VDD lead-in portion with insulating layers and holes for electrical connection, which reduces VDD voltage drop by providing a more efficient power signal transmission path across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If VDD signal lines are used to transmit power from the driving IC to pixel units, then power supply is achieved, but significant voltage drop occurs due to line resistance
Solution Approach 1:
The display area is divided into a lower display area and an upper display area, with separate VDD signal lines (first VDD signal lines for the lower area, second VDD signal lines for the upper area) supplying power to each region independently from the driving IC, thereby reducing the transmission distance and voltage drop for each segment
Solution Approach 2:
The patent transitions from a single-sided power supply approach to a multi-dimensional power distribution network by introducing multiple VDD signal lines extending in different directions from the driving IC to different regions of the display area, creating a more distributed power delivery architecture
2Device complexity
If driving IC is disposed on one side edge of the display panel, then device structure is simplified, but asymmetric brightness and poor brightness uniformity occur
Solution Approach 1:
The display area is segmented into lower and upper regions, each served by dedicated VDD signal lines from the driving IC, allowing independent power optimization for each segment to compensate for the asymmetric positioning of the driving IC
Solution Approach 2:
Different regions of the display area are provided with locally optimized power supply paths through separate VDD signal lines, ensuring that each region receives adequate power despite the one-sided placement of the driving IC, thereby achieving uniform brightness across the entire display
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 significantly reduces VDD voltage drop, achieving brightness uniformity of up to 97% by ensuring consistent power delivery to all pixel units, thereby improving the overall display quality.
Implementation Method 1
the driving IC 10 provides a power supply voltage VDD to each pixel units through a plurality of VDD signal lines 16
Implementation Method 2
due to resistance of the VDD signal lines 16 itself, when the VDD supply voltage is transmitted from a side near the drive IC 10 to another side away the drive IC 10, the loss on the VDD signal lines 16 causes a significant ohmic voltage drop across the VDD signal lines 16 (IR drop)
Data Source
AI summary
The present invention provides a display panel including a base substrate, a plurality of pixel units, and a power signal structure. A display area of the display panel includes a lower display area, a middle display area, and an upper display area. The power signal structure includes a VDD power cable, a plurality of VDD signal lines, and a VDD lead-in portion. The VDD lead-in portion is electrically connected to each of the VDD signal lines through holes provided in an insulated layer in the middle display area. Therefore, the VDD power signals provided by a driving chip are introduced from the middle display area, and then transmitted from the middle display area to each of the pixel units by the VDD signal lines, which can effectively reduce the VDD voltage drop in an organic light emitting diode (OLED) panel, thereby significantly improving brightness uniformity of the OLED panel.