OLED Display Driving Method for Luminance Consistency
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Solution Overview
Problem
OLED displays face challenges in maintaining consistency of maximum luminance, especially when displaying white background images, due to voltage drops that vary across different pixels, leading to uneven luminance and power consumption issues.
Innovation Solution
A method and apparatus for driving OLED displays that calculate a load value for input image data, adjust the luminance using a voltage drop proportional value, and generate output image data to maintain consistent maximum luminance across pixels, while also improving uniformity and reducing power consumption by considering grayscale distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage drop compensation is not applied, then the display structure remains simple, but maximum luminance consistency deteriorates due to varying voltage drops across different pixels
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing voltage drop proportional values for each pixel in a lookup table before actual display operation. During display, the system only needs to retrieve and apply the pre-computed compensation values based on pixel position and driving current, rather than performing complex real-time calculations. This maintains high luminance consistency while minimizing processing complexity during operation.
Solution Approach 2:
The patent changes the parameter approach by introducing a voltage drop proportional value as a compensation parameter that varies with pixel position and driving current. Instead of attempting to equalize actual voltage drops through complex circuit modifications, the system adjusts the driving parameters (image data values) based on pre-determined proportional relationships, achieving luminance consistency through parameter adjustment rather than physical modification.
2Stability of the object's composition
If uniform driving current is applied to all pixels, then the driving circuit remains simple, but luminance uniformity deteriorates due to position-dependent voltage drops
Solution Approach 1:
The patent applies local quality by making the driving parameters pixel-specific through the introduction of position-dependent voltage drop proportional values. Each pixel receives customized compensation based on its location in the display array and its specific voltage drop characteristics. The lookup table stores different compensation values for different pixel regions, allowing uniform circuit architecture to achieve non-uniform (pixel-optimized) driving conditions that ensure luminance uniformity across the entire display.
3Manufacturing precision
If image data is adjusted without considering load value, then the processing steps remain few, but maximum luminance consistency deteriorates under varying driving loads
Solution Approach 1:
The patent applies preliminary action by pre-calculating voltage drop proportional values and storing them in a lookup table before actual image processing. During display, the system retrieves the appropriate compensation values based on pixel position and driving current, then applies them to the image data. This separates the complex calculation work into a preliminary offline phase, leaving only simple table lookup and multiplication operations during real-time display, thus maintaining luminance consistency without significantly increasing processing complexity.
Data Source
AI summary
An organic light-emitting diode (OLED) display and a method of driving the display are disclosed. In one aspect, the method includes receiving input image data, calculating a load value corresponding to a driving amount of the input image data, and calculating a luminance adjustment value for each of the pixels based at least in part on the load value and a voltage drop proportional value of each of the pixels. The voltage drop proportional value corresponds to a ratio of a voltage drop value to a maximum voltage drop value. The method also includes generating output image data based at least in part on the input image data and the luminance adjustment value and displaying an image corresponding to the output image data.