Pixel Circuit Layout With Boosting Capacitor for Fewer Power Lines
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Solution Overview
Problem
Existing display devices require a large number of power lines to connect sub-pixels, limiting design freedom and complicating the implementation of high-resolution displays.
Innovation Solution
A pixel structure is introduced that includes specific transistors and capacitors to minimize the number of power lines needed, allowing for efficient voltage distribution and initialization of sub-pixels using a single power line, with boosting capacitors to adjust anode electrode voltages independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power lines are connected to each sub-pixel, then voltage distribution and control are improved, but device complexity and design difficulty increase
Solution Approach 1:
The patent merges multiple power line functions into a single power line by introducing a boosting capacitor that generates multiple voltage levels (ELVDD1, ELVDD2, ELVDD3) from one power supply line. This combining approach reduces the number of physical power lines needed while maintaining the ability to provide different voltages to different sub-pixels, thereby reducing device complexity while preserving voltage distribution capability.
Solution Approach 2:
The boosting capacitor acts as an intermediary component between the single power line and the sub-pixels. It receives voltage from the power line and generates multiple boosted voltage levels, mediating the voltage distribution function without requiring multiple direct power line connections to each sub-pixel. This intermediary mechanism resolves the contradiction by providing complex voltage control through a simple power line interface.
2Device complexity
If the number of power lines is reduced, then device complexity is minimized, but voltage control flexibility and initialization capability are degraded
Solution Approach 1:
The patent introduces dynamic voltage control capability through the boosting capacitor, which can dynamically generate different voltage levels (ELVDD1, ELVDD2, ELVDD3) from a single power line. This dynamic voltage generation provides the same flexibility as multiple static power lines would provide, maintaining adaptability while reducing physical connections. The emission control line further enhances this by dynamically controlling when each sub-pixel emits light based on its specific voltage requirements.
Solution Approach 2:
The patent changes the voltage parameter dynamically by using the boosting capacitor to generate multiple voltage levels from a single power line. Instead of having fixed voltage levels from multiple power lines, the system transforms a single voltage input into multiple voltage outputs, providing flexible voltage control. This parameter transformation maintains control flexibility while minimizing the number of power lines required.
3Manufacturing precision
If more power lines are used for initialization, then sub-pixel initialization accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the initialization function with the emission control function by using the same emission control line to initialize sub-pixels. The boosting capacitor provides the necessary voltage levels for both initialization and emission operations through a single control line, eliminating the need for separate initialization power lines. This merging of functions simplifies manufacturing while maintaining initialization accuracy through the use of ELVDD3 voltage level.
Data Source
AI summary
According to embodiments of the disclosure, a pixel includes a first transistor connected between a first power line and a second power line, and having a gate electrode connected to a first node, a light emitting element connected between the first power line and the second power line, an initialization transistor connected between a third power line and an anode electrode of the light emitting element, and having a gate electrode connected to a first scan line, and a boosting capacitor connected between the first scan line and the anode electrode of the light emitting element.