OLED Display Ambient Light Compensation via Dynamic Saturation Adjustment
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Solution Overview
Problem
OLED displays face reduced display quality and visibility under varying ambient light conditions, particularly when exposed to bright outdoor or solar light, as they struggle to maintain image brightness and clarity.
Innovation Solution
An OLED display system that includes a pixel portion connected to scan and data lines, an optical sensor to generate light intensity signals, and a data converter with a comparator, controller, calculators, and memory to adjust image data by changing saturation and luminance values based on ambient light conditions, using reference look-up tables and interpolation methods to enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If OLED displays are used in portable devices, then weight and volume are reduced, but display visibility deteriorates under bright ambient light conditions
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the emission intensity of OLED subpixels based on detected ambient light conditions. The display device transitions from a static display mode to a dynamic one where the brightness and color characteristics of pixels are continuously adapted to match the surrounding environment, thereby maintaining visibility across varying light conditions while preserving the inherent lightweight advantage of OLED technology
Solution Approach 2:
The invention changes physical parameters of the displayed image by adjusting the emission intensity ratios of red, green, and blue subpixels according to ambient light temperature characteristics. When ambient light is warm-toned, the display increases blue subpixel intensity and reduces red/green intensity, and vice versa for cool-toned ambient light. This parameter adjustment compensates for ambient light effects and maintains display visibility without adding significant weight
2Illumination intensity
If emission intensity of OLED subpixels is adjusted according to ambient light, then display visibility is improved, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by integrating the ambient light sensing capability and image processing functions into existing display components. The same OLED subpixels that display images also serve as the sensing elements for detecting ambient light characteristics. Additionally, the image processor performs both standard image rendering and ambient light compensation tasks, eliminating the need for separate dedicated sensing hardware and processing pathways
Solution Approach 2:
The display device performs self-service by using its own OLED subpixels to sense ambient light conditions and automatically adjusting its emission characteristics without requiring external sensing devices or complex control systems. The embedded processor leverages the display's existing data processing capabilities to implement the compensation algorithm, allowing the system to adapt to environmental conditions using its inherent resources
3Illumination intensity
If saturation and luminance values are changed to enhance visibility, then display quality is improved, but energy consumption increases
Solution Approach 1:
The patent optimizes energy consumption by selectively adjusting only the emission intensity parameters of subpixels that require compensation for ambient light effects, rather than increasing the brightness of all pixels uniformly. The system calculates the minimum necessary intensity changes for red, green, and blue subpixels based on the specific ambient light conditions, thereby achieving visibility improvement with minimal additional energy expenditure
Solution Approach 2:
The invention applies partial action by implementing compensation only for the specific color channels and pixel regions that are most affected by ambient light conditions. Rather than uniformly enhancing all display elements, the system selectively adjusts subpixel intensities where needed, avoiding unnecessary energy consumption in areas that already maintain adequate visibility
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
The system effectively improves display visibility and quality across varying ambient light conditions by dynamically adjusting image data, particularly by increasing saturation when ambient light intensity exceeds a threshold, thereby maintaining image clarity and brightness.
Implementation Method 1
an optical sensor adapted to generate an optical sensing signal according to an intensity of light
Data Source
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Figure 3A~3D
AI summary
An organic light emitting diode (OLED) display, including a pixel portion (100) having a plurality of pixels (110) connected to scan lines (S1, S2, Sn) and data lines (D1, D2, Dm), a scan driver (200) adapted to generate and supply scan signals to the scan lines (S1, S2, Sn), a data driver (300) adapted to generate and supply data signals to the data lines (D1, D2, Dm), an optical sensor (500) adapted to generate an optical sensing signal (Ssens) according to an intensity of light of the environment, and a data converter (400) adapted to store input image data (RGB Data) or changed data (R'G'B' Data) from the input image data (RGB Data) according to the optical sensing signal (Ssens). The data driver (300) is adapted to generate the data signal corresponding to the input image data (RGB Data) or the changed data (R'G'B' Data).