Display Pixel Driver Mesh Wiring for Uniform Current and High Resolution
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Solution Overview
Problem
The width of light emitting pixel drivers in display devices is increased due to the inclusion of driving transistors and transistors for initializing potential, leading to limitations in resolution and uneven transmission of driving currents, causing luminance differences and image quality degradation.
Innovation Solution
The display device incorporates mesh-shaped wires with low resistance to transmit constant voltages to light emitting pixel drivers, reducing the width of each driver and ensuring uniform current distribution through island-shaped connection auxiliary electrodes and auxiliary lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting pixel drivers include driving transistors and initialization transistors to supply driving current uniformly and stably, then the stability and uniformity of driving current is improved, but the width of each light emitting pixel driver increases, limiting resolution improvement
Solution Approach 1:
The pixel driver is divided into multiple separate transistor components (driving transistor, initialization transistor, emission control transistor) that are spatially distributed within the pixel structure. This segmentation allows each transistor to be optimized independently for function while collectively achieving stable current supply without excessive width increase.
Solution Approach 2:
The patent utilizes vertical stacking and multi-layer wiring structures to accommodate multiple transistor functions within a compact planar footprint. By transitioning to three-dimensional spatial arrangement, the driver width is minimized while maintaining all necessary functional components.
2Reliability
If constant voltage lines are extended throughout the display area to transmit driving voltages, then the stability of voltage transmission is improved, but wiring resistance causes non-uniform voltage transmission and luminance differences between areas
Solution Approach 1:
Different regions of the display are provided with locally optimized voltage transmission paths. Compensation transistors and adjustable voltage lines are positioned in specific areas to counteract local wiring resistance effects, ensuring uniform voltage delivery across the entire display without requiring excessive voltage headroom.
Solution Approach 2:
The pixel structure includes feedback mechanisms where the state of the light emitting element influences the operation of control transistors. This feedback allows dynamic adjustment of driving currents to compensate for voltage drops across different display areas, maintaining uniform luminance despite variations in wiring resistance.
3Manufacturing precision
If multiple transistors are included in light emitting pixel drivers to generate and initialize driving currents, then the control precision and stability of light emission is improved, but the device complexity and area occupation increase
Solution Approach 1:
Certain transistor components are designed to perform multiple functions. For example, the emission control transistor not only controls the timing of light emission but also participates in the initialization process. This multi-functionality reduces the total number of transistors required while maintaining precise control over light emission characteristics.
Solution Approach 2:
The patent combines certain functions that could be separate into integrated transistor operations. The initialization transistor works in conjunction with the driving transistor to achieve both initialization and current generation functions, reducing overall device complexity while preserving manufacturing precision.
Data Source
AI summary
A display device includes a substrate including a display area in which emission areas are arranged and a non-display area around the display area; a circuit layer on the substrate; and an element layer on the circuit layer, and including light emitting elements respectively located in the emission areas, wherein the circuit layer includes: light emitting pixel drivers electrically connected to the light emitting elements, and arranged side by side with each other along a first direction and a second direction; data lines extending in the second direction, and transmitting a data signal to the light emitting pixel drivers; first auxiliary lines extending in the first direction; second auxiliary lines extending in the second direction and adjacent to the data lines in the first direction; third auxiliary lines extending in the second direction, and located between the second auxiliary lines in the first direction; and first connection auxiliary electrodes.