OLED Display Panel Sensing Line Configuration for Aperture Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display panels face challenges in ensuring sufficient charging time and uniformity due to insufficient aperture ratio and parasitic capacitance, which affect picture quality, especially in large-size and high-resolution displays, and threshold voltage differences among drive transistors cause display unevenness.
Innovation Solution
A display panel design with a sensing line configuration that allows double-line scanning and sharing of sensing lines, incorporating a drive circuit and sensing control circuit to sense light-emitting current or voltage, and a compensation method to generate compensation data for data signals, thereby increasing aperture ratio and reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional sensing line configuration is used, then the circuit structure is simple, but the aperture ratio is insufficient and parasitic capacitance is high
Solution Approach 1:
The pixel array is divided into pixel unit groups with pixel units arranged in two rows, where each row is connected to different data lines. This segmentation allows for optimized sensing line configuration that reduces parasitic capacitance and increases aperture ratio by strategically positioning sensing lines relative to the segmented pixel structures.
Solution Approach 2:
The sensing line is configured to serve multiple pixel unit groups simultaneously, reducing the total number of sensing lines required. This multi-functional approach maintains comprehensive sensing capability while reducing overall circuit complexity and increasing the aperture ratio of individual pixel units.
2Duration of action of moving object
If conventional scanning is used, then the circuit structure is simple, but the charging time is insufficient
Solution Approach 1:
Double-line scanning is implemented where pixel units in different rows are scanned in alternating periods. This periodic scanning approach doubles the charging time available for each pixel unit compared to conventional single-line scanning, while maintaining a relatively simple circuit structure through systematic timing control.
Solution Approach 2:
The drive circuit is configured to perform preliminary charging of the pixel units during the scanning process. By preparing and charging pixel units in advance during their designated scanning period, the system ensures sufficient charging time is provided before the light-emitting phase begins.
3Reliability
If threshold voltage compensation is not implemented, then the device complexity is low, but the display uniformity is poor
Solution Approach 1:
The sensing line is configured to detect the light-emitting current or voltage of each light-emitting element, providing feedback information about the actual emission state. This feedback is used to generate compensation data that corrects for threshold voltage differences among drive transistors, improving display uniformity through a relatively simple compensation mechanism.
Solution Approach 2:
The compensation method involves changing the data signal parameters based on sensed values from the sensing line. By adjusting the data signal to compensate for threshold voltage variations, the system achieves improved display uniformity without requiring complex additional compensation circuits.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A display panel, a display device and a compensation method are provided. The display panel includes at least one pixel unit group (20), at least one sensing line (S), a plurality of gate lines (G), a plurality of first data lines (D1) and a plurality of second data lines (D2). Each pixel unit group (20) includes a plurality of pixel units (100) arranged in two rows and a plurality of columns, the plurality of pixel units (100) in each pixel unit group (20) are connected to a same one of the gate lines (G) to receive a same gate signal, one of two pixel units (100) in each column of each pixel unit group (20) is connected to one of the first data lines (D1) corresponding thereto, other one of the two pixel units (100) in each column of each pixel unit group (20) is connected to one of the second data lines (D2) corresponding thereto, the plurality of pixel units (100) in each pixel unit group (20) are connected to a same sensing line (S), a pixel unit (100) includes a light-emitting element (OLED), and the sensing line (S) is configured to sense a light-emitting current or a light-emitting voltage of the light-emitting element (OLED). The display panel (10) can improve the aperture ratio of the pixel units (100), provide more sufficient charging time for the pixel units (100) and accelerate a sensing speed.