Dummy Scan Lines for Luminance Uniformity in OLED Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting display devices face challenges in maintaining uniform luminance across different areas due to variations in signal magnitude and timing between pixel rows, leading to non-uniform image display.
Innovation Solution
The introduction of dummy scan lines in a peripheral area surrounding the display area, which intersect data lines and form capacitance, allows for the compensation of signal magnitude differences between pixel rows by supplying dummy scan signals, thereby adjusting the data signals provided to pixels, ensuring uniform luminance across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If scan lines are provided to all pixel rows without dummy scan lines, then the device complexity is reduced, but the luminance uniformity across different pixel rows deteriorates
Solution Approach 1:
Dummy scan lines are introduced as intermediary elements that do not directly connect to pixels but intersect with data lines in the peripheral area. These dummy scan lines form capacitance with data lines to compensate for signal magnitude differences between pixel rows, thereby improving luminance uniformity without significantly increasing device complexity
Solution Approach 2:
The capacitance formed between dummy scan lines and data lines changes the electrical parameters of the data lines. By adjusting the dummy scan signal magnitude, the signal magnitude supplied to different pixel rows is compensated, ensuring uniform luminance across the display area
2Illumination intensity
If dummy scan lines are added to compensate signal magnitude differences, then the luminance uniformity is improved, but the device complexity increases
Solution Approach 1:
The dummy scan lines serve as intermediary structures that indirectly affect pixel operation through capacitance coupling with data lines. This approach achieves luminance compensation without requiring direct connections to pixels or complex additional circuitry
Solution Approach 2:
The dummy scan lines are positioned in the peripheral area surrounding the display area, utilizing the spatial dimension outside the active pixel region. This allows capacitance compensation without occupying pixel area or significantly increasing overall device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures that the image is displayed with uniform luminance by compensating for signal magnitude variations between pixel rows, improving the overall display quality and consistency.
Implementation Method 1
A capacitance may be formed between the dummy scan line and the data line intersecting the dummy scan line
Data Source
AI summary
A display device includes: pixels provided in a display area; data lines connected to the pixels, the data lines providing data signals to the pixels; scan lines connected to the pixels, the scan lines providing scan signals to the pixels; and dummy scan lines intersecting the data lines in a peripheral area surrounding the display area.