OLED Display Power Wiring Grid for Voltage Drop Reduction
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Solution Overview
Problem
In OLED display devices, the voltage drop along the gate on voltage line leads to non-uniform scan signal voltages, degrading display quality, especially as the size of the display panel increases, due to increased voltage level differences between signals near and far from the power supply circuit.
Innovation Solution
The implementation of a power wiring with a grid or mesh structure within the display panel to transfer a pixel driving voltage from a first power supply circuit to the pixels, allowing the scan driver to receive this voltage and generate scan signals, thereby reducing the need for a gate on voltage line and minimizing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gate on voltage line is used to supply voltage to the scan driver, then the device complexity is reduced, but the voltage drop increases causing non-uniform scan signal voltages
Solution Approach 1:
The patent segments the power supply approach by using multiple power supply circuits positioned at different locations (first power supply circuit at top, second power supply circuit at bottom) to supply pixel driving voltages through separate power wiring layers. This segmentation distributes the power delivery function across multiple independent pathways, preventing the voltage drop accumulation that would occur in a single long voltage line while maintaining uniform scan signal voltages across the display panel.
2Area of stationary object
If the display panel size is increased, then the display area is enlarged, but the voltage level difference between scan signals at different positions increases
Solution Approach 1:
The patent applies local quality by providing different power supply configurations for different regions of the display panel. The first power supply circuit supplies the upper region through first power wiring, while the second power supply circuit supplies the lower region through second power wiring. This localized power delivery ensures that each region receives adequate voltage independently, maintaining uniform scan signal voltages across the entire enlarged display panel area.
Solution Approach 2:
The patent transitions from a one-dimensional power supply approach (single voltage line) to a two-dimensional power distribution network using multiple power wiring layers (first power wiring layer and second power wiring layer) positioned at different vertical locations. This dimensional expansion allows power to be delivered from multiple directions simultaneously, compensating for voltage drops across large display areas and maintaining voltage uniformity.
3Device complexity
If a gate on voltage line is used to provide scan signals, then the device structure is simplified, but the display quality is degraded due to voltage drop
Solution Approach 1:
The patent introduces power wiring layers as intermediary structures between the power supply circuits and the scan driver. These power wiring layers (first power wiring layer and second power wiring layer) act as mediators that efficiently transfer pixel driving voltages from the power supply circuits to the scan driver, minimizing voltage drops and ensuring reliable scan signal generation throughout the display panel.
Data Source
AI summary
An organic light emitting diode (OLED) display device includes a first power supply circuit configured to generate a pixel driving voltage, a display panel configured to receive the pixel driving voltage from the first power supply circuit, and including a plurality of pixels each configured to emit light based thereon, and a scan driver configured to receive the pixel driving voltage from the display panel, and to provide scan signals based on the pixel driving voltage to the plurality of pixels.