OLED Display Substrate Dual-End Power Supply for Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OLED display technologies, the uneven display brightness across an entire panel is caused by differing driving voltages at different pixel positions due to voltage drops along the power supply voltage lines, leading to non-uniform illumination.
Innovation Solution
A display substrate with a power supply signal structure that includes multiple driving voltage lines, where a first power supply voltage is applied to one end and a second power supply voltage is applied to the other end of each driving voltage line, ensuring equal voltage values at both ends, thereby minimizing voltage drops and enhancing brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power supply voltage line is used to supply voltage to all pixel units, then the device complexity is reduced, but voltage drops occur along the line causing nonuniform display brightness
Solution Approach 1:
The power supply voltage line is segmented into multiple independent lines (first power supply voltage line and second power supply voltage line). Each line supplies voltage to different regions or ends of the pixel units, reducing the total length of any single voltage supply path and minimizing voltage drops that cause brightness nonuniformity.
Solution Approach 2:
Different power supply voltage lines are optimized for different regions of the display panel. The first power supply voltage line may be optimized for one end of the panel while the second line serves the opposite end, allowing each line to be designed with appropriate width, material, and routing to minimize local voltage drops and achieve uniform brightness across the entire panel.
2Area of stationary object
If the power supply voltage line is made longer to cover the entire panel, then all pixel units can be supplied, but voltage drops increase causing differing driving voltages at different positions
Solution Approach 1:
The single long power supply voltage line is divided into multiple shorter segments (first and second power supply voltage lines). Each segment covers a specific region of the panel, reducing the maximum length of any voltage supply path. This segmentation maintains full panel coverage while ensuring voltage stability by limiting the distance over which voltage drops can accumulate.
Solution Approach 2:
Instead of extending a single line across the entire panel area, the power supply structure uses multiple lines arranged in different spatial dimensions or configurations. This multi-dimensional arrangement reduces the maximum path length from any voltage source to any pixel unit, maintaining comprehensive coverage while improving voltage stability throughout the panel.
Data Source
AI summary
A display substrate and a method for driving the display substrate are provided in the present disclosure. The display substrate includes a plurality of pixel units arranged in an array and a power supply signal structure configured to apply a power supply voltage signal to each pixel unit. The power supply signal structure includes: a plurality of driving voltage signal VDD lines, a first power supply voltage signal VDD1 line connected to a first end of each driving voltage signal VDD line, and configured to apply a first power supply voltage V1 to the first end of the driving voltage signal line, and a second power supply voltage signal VDD2 line connected to a second end of the driving voltage signal VDD line, and configured to apply a power supply voltage V2 to the second end of the driving voltage signal VDD line.