OLED Common Cathode IR Drop Control via Dynamic Wire Switching
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Solution Overview
Problem
Organic light-emitting diode (OLED) display panels face issues with display performance due to IR drop phenomena, which affect brightness uniformity across the panel, especially when displaying medium-high or low grayscale images, leading to mura effects and degraded compensation effects.
Innovation Solution
A driving method that dynamically adjusts the connection of wires connected to a common cathode based on the total image current, using threshold currents to control switches and reduce IR drop influence, thereby improving display performance by optimizing power distribution across sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the common cathode is connected to the first power terminal through a wire, then the power voltage can be supplied to the sub-pixels, but IR drop phenomena occur causing brightness non-uniformity and mura effects
Solution Approach 1:
The patent segments the power supply path by dividing the sub-pixels into multiple groups (first group connected through first wire, second group connected through second wire) to reduce the current load on each individual wire, thereby minimizing IR drop effects and improving brightness uniformity across the display panel
Solution Approach 2:
The patent applies different connection configurations to different regions of the display panel by selectively connecting wires to the common cathode based on local current requirements, ensuring optimal power distribution and minimizing IR drop in high-current regions while maintaining simplicity in low-current regions
2Illumination intensity
If the total image current is high, then the display can show bright images, but the IR drop increases causing degraded compensation effects and mura effects
Solution Approach 1:
The patent dynamically adjusts the wire connection state based on the total image current threshold, switching between different connection modes (connected or disconnected) to optimize the balance between providing sufficient power for bright display and minimizing IR drop that degrades compensation precision
Solution Approach 2:
The patent changes the electrical connection parameter (wire connection state) based on the current level, transitioning between connected and disconnected states to maintain optimal compensation precision across different brightness levels and prevent mura effects
3Loss of energy
If multiple wires are used to connect to the common cathode, then the IR drop can be reduced, but the device complexity increases
Solution Approach 1:
The patent applies partial action by selectively connecting only necessary wires to the common cathode based on the total image current threshold, avoiding the complexity of always connecting all possible wires while still achieving sufficient IR drop reduction when needed
Solution Approach 2:
The patent introduces a switching mechanism as an intermediary between the wires and the common cathode, which controls the connection state based on current thresholds, thereby managing the complexity through intelligent control rather than fixed complex wiring
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 method enhances display performance by reducing the impact of IR drops, ensuring better brightness uniformity and improved display quality across the panel, even for medium-high and low grayscale images, while maintaining simplicity and low cost.
Implementation Method 1
a common cathode configured to receive a power voltage provided by the first power terminal through the first wire
Implementation Method 2
a first switch configured to control a connection state between the first wire and the common cathode in response to a total image current of a display image
Data Source
AI summary
A display panel and a driving method thereof, a display device. The display panel includes a common cathode, a first power terminal, a first wire and a first switch. The driving method includes: obtaining a total image current of a display image; and determining whether the total image current is greater than a first threshold current, if the total image current is greater than the first threshold current, controlling the first switch to disconnect the first wire, if the total image current is not greater than the first threshold current, controlling the first switch to connect the first wire, so that the second side of the common cathode is connected to the first power terminal through the first wire.