OLED Display Gray Level Regulation via Luminance Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display (OLED) devices face high power consumption issues due to high current usage during bright light emission, particularly in portable devices with limited battery capacity, which affects visibility and efficiency.
Innovation Solution
A method is introduced to reduce power consumption by extracting luminance components from input image data, determining luminance distribution through histogram analysis, dividing it into ranges, and converting the data using specific conversion equations to regulate gray levels, thereby optimizing image visibility and reducing current usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED device emits bright light to improve visibility, then illumination intensity is improved, but power consumption increases
Solution Approach 1:
The patent segments the luminance distribution into multiple ranges (first luminance range, second luminance range, third luminance range) based on histogram analysis. Different gray level regulation strategies are applied to each range: the first range (low luminance) uses minimal regulation to preserve visibility, the second range (medium luminance) applies moderate regulation, and the third range (high luminance) applies strong regulation to reduce current consumption. This segmented approach allows the display to maintain visibility in dark regions while significantly reducing power consumption in bright regions.
Solution Approach 2:
The patent applies different gray level regulation equations to different luminance ranges based on local characteristics of the image content. The conversion unit determines luminance distribution through histogram analysis and applies location-specific conversion equations: y = a1*x + b1 for low luminance pixels, y = a2*x + b2 for medium luminance pixels, and y = a3*x + b3 for high luminance pixels. This local quality approach ensures that each region of the image receives appropriate gray level adjustment tailored to its luminance characteristics, optimizing both visibility and power consumption.
2Use of energy by moving object
If automatic current limit controls current amount to reduce power consumption, then power consumption is reduced, but image visibility deteriorates
Solution Approach 1:
The patent implements dynamic gray level regulation through a conversion unit that performs real-time histogram analysis on input image data and dynamically adjusts gray levels based on the analyzed luminance distribution. The system continuously monitors the luminance characteristics of the displayed content and adapts the gray level conversion equations accordingly. This dynamic approach allows the display to maintain optimal visibility by preserving gray levels in important visual regions while reducing current consumption in less critical bright regions, achieving a balance between visibility and power savings.
Solution Approach 2:
The patent changes the gray level parameter dynamically based on luminance distribution analysis. The conversion unit extracts luminance components from input image data, analyzes the histogram to determine luminance distribution, and then applies different conversion equations (with different coefficients a1, a2, a3 and constants b1, b2, b3) to different luminance ranges. This parameter change strategy allows the system to reduce current consumption by lowering gray levels in high-luminance regions while maintaining adequate visibility by preserving gray levels in low and medium luminance regions where visual information is more critical.
Data Source
AI summary
A display device includes a pixel unit including scan lines, data lines crossing the scan lines, and pixels connected to the scan lines and the data lines; a timing control unit configured to receive first data from an outside; a conversion unit configured to receive the first data from the timing control unit, to extract luminance components of the first data corresponding to the pixels to determine luminance distribution of the first data, to divide the luminance distribution into a plurality of luminance distribution ranges, and to convert the first data into second data by regulating an input gray level of the first data based on a conversion equation corresponding to a variation between data of the luminance distribution ranges; and a data drive unit configured to receive the second data from the conversion unit and to provide the second data to the data lines.