Gamma Reference Voltage Generator for OLED Display
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Solution Overview
Problem
Existing organic electroluminescent display devices face challenges in distinguishing dark images and reducing power consumption, particularly in displaying bright images, where current technologies do not effectively enhance image clarity or manage power usage efficiently.
Innovation Solution
The solution involves an organic electroluminescent display device with a gray level extractor, an image type determiner, a gamma reference voltage generator, a data driver, and a timing controller that categorize frame data signals into low, medium, and high-gray-level types, selecting appropriate gamma reference voltages to optimize image display and reduce power consumption based on image type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gamma reference voltage is used for all images, then the circuit structure remains simple, but image distinction in dark images deteriorates and power consumption increases for bright images
Solution Approach 1:
The patent implements dynamic selection of gamma reference voltages based on image characteristics. The gamma reference voltage generator switches between different gamma reference voltages (first, second, third) depending on whether the image is classified as dark, medium, or bright, allowing the display to adapt its gamma characteristics to match the content being displayed.
Solution Approach 2:
The patent changes the gamma reference voltage parameter according to image type. By extracting gray levels from the image and determining the image type (dark/medium/bright), the system selects appropriate gamma reference voltages to optimize the display characteristics for each image category, improving image distinction without requiring complete circuit redesign.
2Device complexity
If a single gamma reference voltage is used for all images, then the power consumption management remains simple, but power consumption increases for bright images
Solution Approach 1:
The patent implements dynamic power management by selecting different gamma reference voltages based on image characteristics. For bright images, a lower gamma reference voltage is selected which reduces the driving voltage and current to the OLED, thereby lowering power consumption. For dark images, a higher gamma reference voltage is selected to maintain image quality.
Solution Approach 2:
The patent changes the gamma reference voltage parameter according to image brightness classification. By extracting gray levels and determining image type, the system selects appropriate gamma reference voltages that optimize both image quality and power consumption for each image category.
3Illumination intensity
If gamma reference voltages are adjusted for different image types, then image distinction and power consumption are optimized, but the device complexity increases
Solution Approach 1:
The patent segments the gamma reference voltage generation into multiple independent voltage sources (first, second, third gamma reference voltages) corresponding to different image types. The gray level extractor and image type determiner divide the image processing into distinct stages, allowing each component to be optimized independently while working together as a cohesive system.
Solution Approach 2:
The patent implements a multi-functional gamma reference voltage generator that can provide different gamma reference voltages based on image characteristics. The same generator circuit handles multiple functions: extracting gray levels, determining image type, and selecting appropriate gamma reference voltages, reducing the need for separate dedicated circuits for each function.
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 improves image distinction for dark images and reduces power consumption for bright images by selectively adjusting gamma reference voltages, enhancing visibility and energy efficiency.
Implementation Method 1
an organic electroluminescent display device includes: a gray level extractor that extracts gray levels of frame data signals for a frame image; an image type determiner that determines a type of the frame image
Data Source
AI summary
An organic electroluminescent display device, includes: a gray level extractor that extracts gray levels of frame data signals for a frame image; an image type determiner that determines a type of the frame image using a distribution of the gray levels of the frame data signals, the type of the frame image being one of a low-gray-level type, a medium-gray-level type and a high-gray-level type; a gamma reference voltage generator that selects a set of gamma reference voltages based upon the image type; a data driver converting the frame data signals into frame data voltages using the selected set of gamma reference voltages; a timing controller that supplies the frame data signals to the data driver; and a display area including pixels having an organic light emitting diode that display the frame image.