OLED Pixel Driving Circuit Timing for Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display panels face issues with large non-display areas and poor brightness uniformity due to inefficient driving circuits, leading to suboptimal display performance.
Innovation Solution
The implementation of a display panel design with pixel groups and scanning driving units, where each pixel group includes multiple pixel rows with specific transistor configurations and timing sequences to optimize data writing and light-emitting phases, reducing current leakage and improving potential stability across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional driving circuits are used for OLED display panels, then the display can be driven, but the non-display area becomes too large and brightness uniformity deteriorates
Solution Approach 1:
The display panel is divided into multiple pixel groups (first pixel group, second pixel group, etc.), with each group containing multiple pixel rows. Separate scanning driving units are assigned to control different pixel groups, enabling segmented driving that reduces the overall driving circuit area while maintaining uniform control across all pixels
Solution Approach 2:
The patent introduces a time-dimensional approach by sequentially controlling different pixel groups in different time periods. The first scanning driving unit controls first pixel groups during a first time period, while the second scanning driving unit controls second pixel groups during a second time period, achieving multiplexed driving that reduces spatial requirements
2Ease of operation
If pixel driving circuits are controlled simultaneously, then driving simplicity is maintained, but current leakage varies and brightness uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by controlling pixel driving circuits in a predetermined sequence rather than simultaneously. The first pixel driving circuits are controlled before the second pixel driving circuits, allowing the holding capacitor to maintain charge longer in previously controlled pixels while avoiding simultaneous current leakage issues
Solution Approach 2:
The driving control is divided into periodic time periods, with different scanning driving units controlling different pixel groups in alternating periods. This periodic control ensures that all pixel driving circuits are eventually controlled while maintaining uniform current leakage characteristics through systematic timing
Data Source
AI summary
A display panel, a method for driving a display panel, and a display device are provided. A first scanning driving unit is electrically connected to first scanning control terminals of first and second pixel driving circuits. A working cycle of the pixel driving circuit includes a data writing phase. The data writing phase of the first pixel driving circuit is prior to the data writing phase of the second pixel driving circuit in a display duration of one frame of an image. When the first pixel driving circuit and the second pixel driving circuit receive a same data voltage, a potential VN11 of the first node in the first pixel driving circuit after the data writing phase of the first pixel driving circuit is greater than a potential VN12 of the first node in the second pixel driving circuit after the data writing phase of the second pixel driving circuit.