Light Emitting Display Power Line Configuration for Uniform Brightness
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Solution Overview
Problem
Conventional light emitting displays experience non-uniform voltage drops in power lines, leading to varying current intensities and brightness across pixels due to differing line resistances, resulting in inconsistent image quality.
Innovation Solution
The implementation of a configuration with multiple power lines and connection lines that equalize voltage drops across the pixel power lines, ensuring uniform current supply to each pixel by connecting power lines through strategically placed electric junctions, thereby maintaining consistent brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power line configuration is used to supply driving voltage to pixels, then the device complexity is reduced, but the voltage drop becomes non-uniform across pixels resulting in non-uniform brightness
Solution Approach 1:
The power supply system is segmented into multiple independent power lines (first power line 50, second power line 51, third power line 52, fourth power line 53) arranged at different sides of the pixel portion. Each power line supplies voltage to a specific region of pixels, dividing the originally single power supply function into multiple distributed segments. This segmentation reduces the voltage drop variation across the display area while maintaining overall system simplicity.
Solution Approach 2:
The power lines are arranged in different spatial dimensions - specifically at different sides (top, bottom, left, right) of the pixel portion. This dimensional distribution of power supply paths ensures that pixels at different positions have relatively equal distance to their nearest power line, thereby equalizing the voltage drop across all pixels without increasing the complexity of the power supply architecture.
2Area of stationary object
If power lines are extended to cover the whole pixel area, then all pixels can be supplied with voltage, but the line resistance increases causing larger voltage drops
Solution Approach 1:
Instead of using one or two long power lines spanning the entire pixel area, the power supply is segmented into multiple shorter power lines positioned at different sides. Each power line serves a localized region, reducing the length and resistance of individual power lines. The segmentation strategy distributes the power delivery function across multiple short paths rather than relying on few long paths, thereby reducing overall voltage drop.
3Area of stationary object
If pixels are positioned at different distances from the power line, then the display area can be expanded, but the voltage drop varies causing non-uniform current supply
Solution Approach 1:
Power lines are positioned at multiple spatial dimensions - specifically at all four sides (top, bottom, left, right) of the pixel portion. This multi-dimensional arrangement ensures that pixels throughout the expanded display area have relatively equal proximity to a power line, regardless of their position. The dimensional distribution strategy maintains current supply uniformity across the entire display area without limiting the expandability of the display.
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 configuration ensures uniform current distribution and brightness across the display, enhancing image quality by minimizing positional variations in voltage drops and current supply.
Implementation Method 1
a first power line arranged on a first side of the pixel portion for supplying a driving voltage; a second power line arranged on a second side of the pixel portion for supplying the driving voltage
Data Source
AI summary
A light emitting display for providing a uniform current flow to a set of pixels to enable uniform brightness for the pixels. The pixels are situated in a pixel portion of a panel where the pixels are located at regions defined by a plurality of scan lines and a plurality of data lines. The uniform power is supplied by a set of power lines on each side of the pixel portion. The uniform voltage is maintained between the power lines by a set of power connection lines. The power connection lines connect the end points of two opposing power lines with interior points of the other two power lines at a set of electric junctions.