Segmented Cathode and Auxiliary Power Supply for Display Panel IR Drop
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Solution Overview
Problem
Large-sized display panels with transparent cathodes in top emission mode experience high resistance, leading to uneven light emission and suboptimal display quality due to IR drops.
Innovation Solution
A display panel design featuring auxiliary power supply units that distribute power uniformly across the cathode layer, comprising a first cathode connected to an auxiliary power supply electrode and a second cathode connected to the pixel unit, ensuring equal voltage application across display sub-areas, along with a specific layer structure and recess portions for optimal power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent cathode is used in a large-sized display panel, then the display panel can achieve top emission mode operation, but the cathode layer exhibits large resistance causing IR drops and uneven light emission
Solution Approach 1:
The cathode layer is segmented into multiple separate cathodes (first cathode, second cathode, third cathode, fourth cathode) corresponding to different display sub-areas. Each cathode is independently connected to the auxiliary power supply unit, allowing independent voltage compensation for each segment, thereby eliminating the IR drop effect that causes non-uniform light emission across the large-sized display panel.
Solution Approach 2:
An auxiliary power supply unit is introduced as an intermediary component between the power source and the cathode layer. This auxiliary unit provides additional power supply paths through multiple cathodes, acting as a mediator to distribute voltage more evenly across the display panel and compensate for the high resistance of the transparent cathode material.
2Device complexity
If the display panel uses a conventional single cathode structure, then the structure is simple, but the voltage distribution across different display sub-areas is uneven due to resistance
Solution Approach 1:
The single cathode structure is segmented into multiple cathodes (first, second, third, and fourth cathodes) corresponding to different display sub-areas. Each segmented cathode is independently connected to the auxiliary power supply unit, enabling independent voltage control and ensuring uniform voltage distribution across all display sub-areas, thereby solving the non-uniform illumination problem.
Solution Approach 2:
The power supply approach is extended from a single-dimensional connection to a multi-dimensional network. The auxiliary power supply unit establishes multiple power supply paths through different cathodes and connection lines, creating a two-dimensional power distribution network that covers the entire display panel area, thus achieving uniform voltage distribution.
3Illumination intensity
If multiple cathodes are introduced to improve voltage distribution, then the voltage uniformity improves, but the device complexity increases
Solution Approach 1:
Multiple cathodes (first, second, third, fourth cathodes) are merged into a unified cathode system that shares a common auxiliary power supply unit. The connection lines are also merged and routed through a common auxiliary electrode, consolidating the complex multi-cathode structure into an integrated system that achieves uniform voltage distribution without proportionally increasing overall device complexity.
Solution Approach 2:
The auxiliary power supply unit serves multiple functions simultaneously: it powers multiple cathodes, compensates for resistance in each cathode segment, and ensures uniform voltage distribution across all display sub-areas. This multi-functionality reduces the need for separate compensation circuits for each cathode, thereby managing device complexity while achieving the desired voltage uniformity.
Data Source
AI summary
A display panel and a method of producing the display panel are disclosed. A pixel unit and an auxiliary power supply unit are disposed at a portion of the display panel corresponding to the display sub-areas, the auxiliary power supply unit is configured to supply a power to a cathode layer so that an voltage of each of the display sub-areas applied by the cathode layer is equal to or substantially equal to each other. The cathode layer has a first cathode and a second cathode. The auxiliary power supply unit has a power line and an auxiliary power supply electrode. The display panel has an improved display quality in this disclosure.