OLED Display Power Supply Segmentation for Brightness Uniformity
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Solution Overview
Problem
OLED displays face challenges in achieving uniform brightness due to voltage drops across power sources, leading to non-uniform images on the panel.
Innovation Solution
The solution involves a first switching unit that alternately supplies a power source from both the top and bottom of the panel to the power source lines, ensuring that the power source is supplied no less than once per frame period, and a second switching unit that alternately supplies the power source to input terminals, compensating for voltage drops to maintain uniform brightness across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If power source is supplied from a single position (top or bottom), then the structure is simple, but voltage drop becomes non-uniform across the panel causing non-uniform brightness
Solution Approach 1:
The power supply structure is segmented into two separate power source lines: a first power source line positioned at the top of the panel and a second power source line positioned at the bottom of the panel. This segmentation allows voltage to be supplied from both ends simultaneously, compensating for voltage drops across different regions of the panel and achieving uniform brightness distribution.
Solution Approach 2:
The power supply approach transitions from a single-point supply to a distributed two-ended supply structure. By adding the vertical dimension (top and bottom positions) to the power supply configuration, the system compensates for horizontal voltage drops across the panel, achieving uniform voltage distribution and brightness.
2Illumination intensity
If power source lines are extended across the entire panel to ensure uniform coverage, then brightness uniformity improves, but voltage drop increases leading to energy loss
Solution Approach 1:
The power supply path is segmented into two separate paths originating from opposite ends (top and bottom). This segmentation reduces the effective length of each power source line, minimizing voltage drops and energy losses while still achieving uniform voltage distribution across the entire panel through the combined effect of both paths.
Solution Approach 2:
By utilizing both vertical ends of the panel for power supply, the system creates a two-dimensional power distribution network. This approach reduces the horizontal current path length, minimizing resistive losses and voltage drops while maintaining uniform voltage across the panel.
3Illumination intensity
If switching unit alternates power supply frequently within a frame period, then voltage uniformity improves, but control complexity increases
Solution Approach 1:
The switching unit implements periodic action by alternately supplying power to the first and second power source lines in synchronization with the frame period. This periodic switching ensures that both top and bottom power source lines receive power at appropriate intervals, maintaining uniform voltage distribution across the panel while using a simple, predictable control pattern that does not require complex real-time adjustments.
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 approach ensures that the average voltage drop is substantially uniform, resulting in an image of substantially uniform brightness, regardless of the panel position, by alternately supplying power sources to maintain consistent voltage differences.
Implementation Method 1
OLED displays use organic light emitting diodes that generate light by re-combination of electrons and holes
Data Source
AI summary
An organic light emitting diode (OLED) display is disclosed. In one embodiment, the OLED display includes a panel including pixels which are configured to control an amount of current that flows from a first power source to a second power source to generate an image of predetermined brightness. The display may also include at least one first power source line formed on a top of the panel and at least one second power source line positioned on a bottom of the panel to face the first power source line. The display may further include a first switch configured to alternately supply the first power source to the first power source line and the second power source line.