Large-Size OLED Display Routing to Counter IR-Drop Brightness Variation
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Solution Overview
Problem
Large-size OLED display apparatus experience brightness inconsistencies due to IR drop, leading to reduced display quality as the distance from the circuit board increases, causing varying current and brightness levels across different light-emitting units.
Innovation Solution
The display apparatus design includes a configuration where the first signal line is connected to the cathode layer away from the circuit board and the second signal line is connected to the anode layer close to the circuit board, ensuring equal current flow and brightness across light-emitting units by minimizing signal loss through optimized signal line connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the signal lines are connected to the anode and cathode layers in the conventional manner, then the device structure is simple, but brightness inconsistency occurs due to IR drop in large-size OLED displays
Solution Approach 1:
The patent inverts the conventional connection configuration by connecting the first signal line to the cathode layer away from the circuit board and the second signal line to the anode layer close to the circuit board. This reversal of the typical connection arrangement compensates for IR drop effects and maintains consistent brightness across the display.
Solution Approach 2:
The patent applies different connection configurations to different signal lines based on their specific roles and positions. The first signal line connects to the cathode layer at a position away from the circuit board, while the second signal line connects to the anode layer close to the circuit board, optimizing each connection locally to address IR drop variations.
2Area of stationary object
If the display apparatus size is increased, then the display area is enlarged, but brightness inconsistency and signal loss increase
Solution Approach 1:
By inverting the conventional signal line connections, the patent enables large-size OLED displays to maintain brightness consistency. The reversed connection arrangement compensates for the increased IR drop that naturally occurs in larger displays, allowing the display area to be enlarged without sacrificing brightness uniformity.
3Area of stationary object
If the distance from the circuit board is increased, then the display coverage is expanded, but signal loss increases causing brightness variation
Solution Approach 1:
The patent reverses the conventional connection configuration to compensate for signal loss over distance. By connecting the first signal line to the cathode layer away from the circuit board and the second signal line to the anode layer close to the circuit board, the patent optimizes signal transmission paths and reduces IR drop effects in expanded display coverage areas.
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 maintains consistent brightness across all light-emitting units, improving the display quality and reducing signal loss, thereby enhancing the overall display performance of large-size OLED devices.
Implementation Method 1
driving an organic light-emitting diode (OLED) to emit light
Data Source
AI summary
A display apparatus and an electronic device are provided. The display apparatus includes a circuit board, an anode layer, a cathode layer, a first signal line, and a second signal line. The circuit board is configured to provide a first signal and a second signal. The first signal line is configured to transmit the first signal. The first signal line is electrically connected to one of the anode layer and the cathode layer, and is connected to one end of the one of the anode layer and the cathode layer away from the circuit board. The second signal line is configured to transmit the second signal. The second signal line is electrically connected to the other of the anode layer and the cathode layer, and is connected to one end of the other of the anode layer and the cathode layer close to the circuit board.