Gamma Compensation for Display Devices in Low Illuminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices experience a reduction in image quality and increased eye fatigue when used in low illuminance environments due to the conventional 2.2 gamma curve, which fails to adequately adjust luminance and gray levels, leading to reduced power consumption and visibility issues.
Innovation Solution
A gamma compensation method that senses external illuminance and adjusts the luminance of the display panel to an optimum level, using a first gamma curve with a concave curve for low gray levels and a convex curve for high gray levels, connected via an inflection point, to modulate gray levels and prevent image quality reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the luminance of the display panel is reduced at low illuminance, then power consumption is reduced, but image quality deteriorates due to reduced grayscale representation
Solution Approach 1:
The patent applies dynamics by switching between different gamma curves (2.2 gamma curve for high illuminance, custom gamma curve for low illuminance) based on the external environment. The gamma curve is dynamically adjusted according to illuminance sensor input, allowing the display to optimize both power consumption and image quality for different viewing conditions.
Solution Approach 2:
The patent changes the gamma curve parameter from the conventional 2.2 to a custom curve specifically designed for low illuminance conditions. This parameter change ensures that when luminance is reduced to save power, the grayscale representation is preserved through the modified gamma function that prevents loss of low gray level details.
2Object-affected harmful factors
If the luminance of the display panel is reduced at low illuminance, then eye fatigue is reduced, but grayscale representation particularly low gray levels deteriorates
Solution Approach 1:
The patent modifies the gamma curve parameter to create a custom curve for low illuminance conditions. This parameter change ensures that when luminance is reduced to minimize eye fatigue, the grayscale representation is preserved through the modified gamma function that prevents loss of low gray level details.
Solution Approach 2:
The patent introduces an illuminance sensor as an intermediary that detects external lighting conditions and triggers the appropriate gamma curve selection. This intermediary enables the system to automatically adapt to viewing conditions, reducing eye fatigue by selecting the appropriate gamma curve without user intervention.
3Ease of manufacture
If a conventional 2.2 gamma curve is used, then the display device is simple to manufacture, but image quality deteriorates in low illuminance environments
Solution Approach 1:
The patent implements a dynamic gamma curve selection system that switches between the conventional 2.2 gamma curve and a custom low-illuminance gamma curve based on environmental conditions. This dynamic approach maintains manufacturing simplicity by using the standard curve when appropriate while improving image quality through the custom curve in low illuminance environments.
Data Source
AI summary
A gamma compensation method and a display device using the same are disclosed. The gamma compensation method includes: sensing a level of external illuminance; determining whether the sensed level of external illuminance is equal to or lower than a predetermined illuminance, wherein when the sensed level is equal to or lower than the predetermined illuminance, the luminance of the display device is reduced to an optimum luminance; and modulating gray levels of input data of the display device based on a first gamma curve when the sensed level of external illuminance is equal to or lower than the predetermined illuminance, and modulating based on a second gamma curve when the sensed level of external illuminance is greater than the predetermined illuminance, wherein the first gamma curve includes a concave curve set in a low gray level area and a convex curve set in a high gray level area, and the concave curve and the convex curve are connected via an inflection point.