OLED Display Brightness Control via Emission Ratio Adjustment
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Solution Overview
Problem
Existing OLED display devices face challenges in reducing power consumption while maintaining image quality, particularly when applying auto current limit (ACL) algorithms, as they can lead to a decrease in perceived image quality due to excessive brightness reduction.
Innovation Solution
An OLED display device and driving method that utilize an auto current limit (ACL) algorithm to adjust image brightness based on the emission ratio and saturation of the source image, with the emission ratio adjuster increasing the emission ratio if saturation is high and maintaining or reducing brightness accordingly, minimizing the impact on perceived image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the ACL algorithm reduces brightness to lower power consumption, then energy efficiency improves, but image quality perceived by users deteriorates
Solution Approach 1:
The patent applies different brightness reduction strategies to different regions of the image based on local characteristics. High saturation regions (which benefit from the H-K effect) receive different treatment compared to low saturation regions, allowing selective brightness adjustment that maintains perceived quality where it matters most while maximizing power savings elsewhere
Solution Approach 2:
The patent dynamically changes the brightness parameter based on the emission ratio and saturation characteristics of the image content. By adjusting brightness as a variable parameter rather than applying a fixed reduction, the system optimizes the trade-off between power consumption and perceived image quality for different types of content
2Illumination intensity
If the emission ratio is increased for high saturation images, then perceived brightness is maintained, but actual power consumption increases
Solution Approach 1:
The patent changes the emission ratio parameter dynamically based on image saturation characteristics. For high saturation images, the emission ratio is increased to leverage the H-K effect and maintain perceived brightness. For low saturation images, the emission ratio remains lower to minimize power consumption, achieving adaptive optimization
Solution Approach 2:
The system transitions from a static brightness reduction approach to a dynamic one where the emission ratio adjusts in real-time based on the saturation content of the displayed image. This dynamic adaptation allows the system to exploit the H-K effect when beneficial while avoiding unnecessary power consumption when it is not
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 solution effectively reduces power consumption while minimizing the lowering of image quality perceived by users, achieving a balance between image quality and power efficiency by adjusting brightness ratios according to the Helmholtz-Kohlrausch effect and emission ratios.
Implementation Method 1
an organic light-emitting diode (OLED) which generates light through a recombination of electrons and holes
Implementation Method 2
the saturation of the source image is higher than a reference value set in consideration of the Helmholtz-Kohlrausch (H-K) effect
Data Source
AI summary
An organic light-emitting diode (OLED) display device capable of reducing power consumption within a range in which an image quality is not lowered, and a method of driving the OLED display device. The OLED display device includes: an image analyzer for obtaining an emission ratio and a saturation of an input source image, the emission ratio indicating light-emitted degrees of pixels constituting the input source image; an emission ratio adjuster for adjusting the emission ratio according to the saturation; a brightness adjuster for adjusting the brightness of the input source image according to the adjusted emission ratio; a data driver for establishing a data voltage of a data signal corresponding to the input source image based on the adjusted original brightness; and a pixel unit including an organic light-emitting diode (OLED), the pixel unit being configured to establish a driving current according to the data voltage.