OLED Display Panel Voltage Distribution for Brightness Uniformity
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Solution Overview
Problem
OLED display panels experience uneven brightness due to voltage drops in the anode and cathode reference voltages as they are transmitted through wires, leading to IR drop issues, resulting in inconsistent illumination across the panel.
Innovation Solution
The OLED display panel design includes an anode voltage output electrode and a cathode voltage output electrode, where the anode reference voltage is sequentially provided from one end to the other, and the cathode reference voltage is provided from the opposite end to the first, using multiple sub-reference voltages and a voltage control chip to manage the voltage distribution, ensuring consistent current flow and brightness across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anode reference voltage is transmitted through wires to light emitting diodes, then the voltage can reach all diodes, but voltage drop occurs due to wire resistance causing uneven brightness
Solution Approach 1:
The anode voltage output electrode is divided into multiple segments (first anode voltage output electrode and second anode voltage output electrode) positioned at different locations. Each segment independently provides reference voltage to adjacent light emitting diodes, reducing the transmission distance and minimizing voltage drop in any single wire segment, thereby improving brightness uniformity while maintaining reliable voltage transmission.
2Reliability
If the cathode reference voltage is transmitted through wires to light emitting diodes, then the voltage can reach all diodes, but voltage drop occurs due to wire resistance causing uneven brightness
Solution Approach 1:
The cathode voltage output electrode is divided into multiple segments (first cathode voltage output electrode and second cathode voltage output electrode) positioned at different locations. Each segment independently provides reference voltage to adjacent light emitting diodes, reducing the transmission distance and minimizing voltage drop in any single wire segment, thereby improving brightness uniformity while maintaining reliable voltage transmission.
3Illumination intensity
If multiple voltage output electrodes are used to reduce voltage drop, then brightness uniformity improves, but device complexity increases
Solution Approach 1:
Instead of increasing the number of electrodes in one dimension, the solution distributes multiple voltage output electrodes across different spatial locations (different dimensions of the display panel). This dimensional distribution allows each electrode to serve a specific region, reducing local voltage drop without requiring a complex centralized electrode structure, thus improving brightness uniformity while controlling device complexity.
Data Source
AI summary
An OLED display panel is disclosed, including: a plurality of light emitting diodes arranged from a first end of a display area of a display panel to a second end opposite thereto; an anode voltage output electrode, configured to output an anode reference voltage to a plurality of anodes of the light emitting diodes; and a cathode voltage output electrode, configured to output a cathode reference voltage to a plurality of cathodes of the light emitting diodes; the anode reference voltage is sequentially provided to the light emitting diodes from the first end to the second end, and the cathode reference voltage is sequentially provided to the light emitting diodes from the second end to the first end; or, the anode reference voltage is provided to the light emitting diodes from the first end and the second end respectively. The disclosure further discloses an OLED display device.