Reused Signal Lines for OLED Cathode Voltage Control
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Solution Overview
Problem
OLED display panels face challenges with a large number of wires and complex wiring difficulties due to independent cathode control of different sub-pixels.
Innovation Solution
The implementation of a display panel with reused signal lines that provide both initialization and cathode voltages to sub-pixels, reducing the number of wires and simplifying the wiring process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent cathode control signal lines are provided for each sub-pixel, then cathode voltage control precision is improved, but device complexity increases due to large number of wires
Solution Approach 1:
The patent applies multi-functionality by enabling signal lines to serve dual purposes: during the initialization stage, they provide initialization voltages to pixel circuits, and during the light emission stage, they provide cathode voltages to light-emitting devices. This allows the same physical wiring infrastructure to support multiple control functions without increasing wire count, thereby maintaining voltage control precision while reducing device complexity
Solution Approach 2:
The patent implements dynamic functionality where signal lines change their electrical connection targets based on operational stage. Through dynamic control mechanisms, the signal lines are selectively connected to different circuit nodes (pixel circuit input terminals during initialization, cathodes during light emission), enabling precise voltage control adaptability without requiring dedicated static wiring for each function
2Reliability
If separate initialization signal lines and cathode signal lines are provided, then signal transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent reduces device complexity by designing signal lines that perform multiple functions sequentially: transmitting initialization voltages during the initialization stage and transmitting cathode voltages during the light emission stage. This eliminates the need for separate dedicated signal lines for each function, reducing overall wire count while maintaining reliable signal transmission through staged operational control
3Adaptability or versatility
If multiple reused signal lines provide different cathode voltages for different sub-pixel types, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display panel into different sub-pixel types (e.g., red, green, blue sub-pixels) and providing different cathode voltages to each type through dedicated reused signal lines. This segmented approach enables tailored voltage optimization for each sub-pixel type while using a shared signal line infrastructure, achieving adaptability without proportionally increasing overall system complexity
Data Source
AI summary
A display panel, a driving method for a display panel, and a display device. The display panel includes a display region, a non-display region, multiple sub-pixels, and at least one reused signal line; each sub-pixel includes a pixel circuit and a light-emitting device; in the pixel circuit, the initialization module is configured to write the initialization voltage to at least one of a control terminal of the drive module and an anode of the light-emitting device; in each sub-pixel, an input terminal of the initialization module in the pixel circuit and a cathode of the light-emitting device are connected to one reused signal line; and each reused signal line is configured to, in an initialization stage, provide the initialization voltage for the initialization module and in a light emission stage, provide the cathode voltage for the cathode of the light-emitting device.