OLED Display Panel Voltage Stability via Segmented Driving Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display panels experience brightness and color deviations due to voltage drops in driving voltage lines, which are exacerbated by the need for wider lines to minimize horizontal voltage drop, making it difficult to design narrow-bezel displays.
Innovation Solution
The OLED display panel employs a configuration with multiple thin film transistors (TFTs) to connect driving voltage lines, allowing for constant voltage transmission to sub-pixels, preventing voltage drops and ensuring consistent brightness and color across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving voltage connecting line is made wider to reduce voltage drop, then voltage stability is improved, but the display panel width increases making narrow-bezel design difficult
Solution Approach 1:
The invention divides the single wide driving voltage connecting line into multiple narrower lines (first, second, and third driving voltage connecting lines) that extend in different directions. This segmentation allows voltage to be distributed through multiple paths, reducing the voltage drop without requiring any single line to be excessively wide, thus enabling narrow-bezel display design.
Solution Approach 2:
The invention transitions from a single-direction (horizontal) voltage distribution to multi-directional distribution by adding vertical components (first and second driving voltage connecting lines extending in vertical direction). This dimensional change creates a three-dimensional voltage distribution network that reduces reliance on horizontal line width while maintaining voltage stability.
2Manufacturing precision
If the driving voltage line is made wider to reduce voltage drop, then brightness consistency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention applies different line width characteristics to different regions and functions. The driving voltage connecting lines have varying widths optimized for their specific roles, while the light-emitting signal lines maintain consistent widths for uniform brightness control. This local optimization allows voltage stability without uniformly increasing all line dimensions, thereby maintaining manufacturing precision.
3Reliability
If multiple driving voltage connecting lines are used to reduce voltage drop, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The first driving voltage connecting line serves multiple functions: it provides voltage to sub-pixels during the light-emitting phase and serves as a signal line during the data-writing phase. This multi-functionality reduces the need for separate dedicated lines, thereby reducing overall device complexity while maintaining voltage stability through the multi-line configuration.
Solution Approach 2:
The invention utilizes periodic switching between data-writing phase and light-emitting phase to dynamically allocate the function of signal lines. During data-writing, certain lines carry data signals; during light-emitting, they carry driving voltages. This periodic action allows the same physical infrastructure to serve multiple purposes, reducing complexity while maintaining reliability.
Data Source
AI summary
An OLED display panel is provided, including: sub-pixels arranged in an array; scanning signal lines, light-emitting signal lines, and first driving voltage lines extending horizontally; and data signal lines, at least one second driving voltage line, and at least one third driving voltage line extending vertically. Each scanning signal line, each light-emitting signal line, and each first driving voltage line are each connected to one row of the sub-pixels. Each data signal line is connected to one column of the sub-pixels. Each first driving voltage line arranged corresponding to each row of the sub-pixels is connected to the second driving voltage line through a first thin film transistor (TFT), and each first driving voltage line arranged corresponding to each row of the sub-pixels is connected to the third driving voltage line through a second TFT. Therefore, brightness deviation or color deviation is avoided when the sub-pixels emit light.