Display Apparatus Grayscale Adjustment Curves for Power and Dynamic Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display apparatuses face challenges in maintaining dynamic range while reducing power consumption, leading to degraded image quality due to mere luminance reduction, which affects user visual sensation.
Innovation Solution
A display apparatus and control method that predict dynamic range changes and adjust output luminance by applying grayscale adjustment curves to minimize visual sensation differences between input and output images, using tone mapping curves to optimize power consumption and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If luminance is reduced to maintain power consumption within a predetermined range, then power consumption is controlled, but dynamic range is degraded and user visual sensation is compromised
Solution Approach 1:
The patent applies grayscale adjustment curves that modify the luminance parameters of pixel values dynamically. By transforming the relationship between input and output luminance through adjustable curves, the system maintains power consumption within acceptable ranges while preserving the dynamic range characteristics of the original image, thus resolving the contradiction between energy efficiency and information preservation.
Solution Approach 2:
The system dynamically adjusts the grayscale adjustment curves based on the specific characteristics of input images and power consumption requirements. Rather than applying a fixed luminance reduction, the curves are adapted to maintain optimal dynamic range preservation while controlling power usage, allowing the system to respond flexibly to different operating conditions.
2Loss of information
If grayscale adjustment curves are applied to maintain dynamic range, then image quality is preserved, but power consumption increases
Solution Approach 1:
The patent modifies the luminance parameters through grayscale adjustment curves that are specifically designed to preserve dynamic range. By carefully controlling the transformation parameters in these curves, the system achieves dynamic range preservation while keeping the associated power consumption increases within acceptable limits, balancing image quality and energy efficiency.
3Use of energy by stationary object
If luminance is merely reduced to control power consumption, then power usage is limited, but image quality and visual sensation are degraded
Solution Approach 1:
Instead of simple luminance reduction, the patent employs grayscale adjustment curves that transform pixel values in a controlled manner. This parameter-based approach allows the system to maintain image quality characteristics such as dynamic range while still achieving power consumption control, avoiding the degradation that occurs with direct luminance reduction.
Solution Approach 2:
The grayscale adjustment curves act as an intermediary mechanism between the input image and the displayed output. These curves mediate the transformation process, ensuring that power consumption is controlled while image quality is preserved, rather than directly reducing luminance which would compromise visual quality.
Data Source
AI summary
A display apparatus is provided. The display apparatus includes: a display; a storage configured to store output luminance information of a plurality of grayscale values according to brightness information; and a processor configured to: obtain a plurality of grayscale adjustment curves based on the output luminance information stored in the storage, obtain a plurality of calibration effects by applying each of the plurality of grayscale adjustment curves to an input image, obtain a grayscale adjustment curve corresponding to a maximum calibration effect from among the plurality of calibration effects, adjust a grayscale of each pixel of the input image based on the obtained grayscale adjustment curve to generate an output image, and output the output image through the display.