Display Panel Voltage Line Layout for Under-Display Transmissive Areas
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Solution Overview
Problem
Existing display panels face challenges in achieving high-quality image display due to the arrangement and connectivity of thin-film transistors, data driving circuits, and voltage supply lines, which affect the efficiency and quality of light emission by light-emitting diodes.
Innovation Solution
The display panel incorporates a conductive line integrated with a horizontal driving voltage line, connected through contact holes in insulating layers, and a storage capacitor with overlapping electrodes, enhancing the connectivity and efficiency of voltage distribution across sub-pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage lines and conductive lines are arranged separately in different layers, then manufacturing complexity increases, but electrical connectivity and voltage distribution efficiency deteriorate
Solution Approach 1:
The patent merges the voltage line and conductive line into a single integrated structure where the conductive line is formed as an extension of the voltage line through the same conductive layer. This integration eliminates the need for separate layer arrangements and additional contact holes, thereby improving electrical connectivity while reducing manufacturing complexity.
Solution Approach 2:
The conductive line serves dual functions: it acts as both a voltage distribution line and a signal conductive line. By making the conductive line electrically connected to the voltage line and extending from it, the structure performs multiple electrical functions within a single element, enhancing connectivity without adding structural complexity.
2Area of stationary object
If sub-pixel circuits are arranged closer to the transmissive area, then display area utilization improves, but voltage distribution efficiency deteriorates due to longer voltage line paths
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked arrangement by forming the conductive line and voltage line in different vertical layers. This dimensional change allows the conductive line to extend horizontally across sub-pixel circuits while the voltage line is positioned in an adjacent layer, effectively shortening the electrical path and reducing resistance despite the horizontal distance.
Solution Approach 2:
The conductive line acts as an intermediary element that bridges the voltage line and the sub-pixel circuits. It receives voltage from the voltage line through vertical electrical connection and distributes it horizontally to sub-pixel circuits, thereby decoupling the voltage distribution path from the signal transmission path and improving overall efficiency.
3Reliability
If multiple contact holes are formed to connect different layers, then electrical connectivity improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent extracts the voltage line and conductive line into separate functional elements within the same conductive layer, with the conductive line formed as a continuous extension. This extraction eliminates the need for multiple contact holes between layers for voltage and signal connection, reducing alignment precision requirements while maintaining electrical connectivity.
Data Source
AI summary
A display panel may include a transmissive area, a display area around the transmissive area, a plurality of light-emitting diodes in the display area, and a plurality of sub-pixel circuits electrically connected to the plurality of light-emitting diodes, respectively, and in the display area. Each of the sub-pixels may include a switching transistor electrically connected to a scan line that extends in a first direction, and electrically connected to a data line that extends in a second direction crossing the first direction, a driving transistor electrically connected to the switching transistor, a storage capacitor electrically connected to the driving transistor, and a conductive line extending in the first direction across a first sub-pixel arranged close to the transmissive area. The conductive line may be electrically connected to a voltage line passing across the first sub-pixel circuit.