Signal Processing Device for Display Color Temperature Adjustment
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Solution Overview
Problem
Display devices cause eye fatigue due to blue emission components, especially when content data contains warm-colored characters, as lowering the color temperature to reduce blue emission can make warm-colored characters less visible due to low contrast.
Innovation Solution
A signal processing device that extracts character areas, sets a target color temperature based on character color information, and adjusts the original color temperature of content data to the target temperature, either gradually or instantaneously, to balance blue emission reduction with character visibility by distinguishing between warm and non-warm colored characters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the color temperature is lowered to reduce blue emission components, then user fatigue is reduced, but warm-colored characters become less visible due to low contrast
Solution Approach 1:
The patent applies local quality by differentiating processing between character areas and non-character areas. The extraction unit identifies character areas, and the color temperature adjustment is applied selectively: non-warm-colored characters receive full color temperature reduction while warm-colored characters maintain higher color temperature to preserve visibility. This localized differentiation resolves the contradiction by applying the harmful factor reduction only where appropriate.
Solution Approach 2:
The patent changes the color temperature parameter dynamically based on character color properties. The setting unit determines target color temperatures differently for warm-colored versus non-warm-colored characters, and the converter adjusts color temperature accordingly. This parameter change strategy allows optimization of both blue emission reduction and character visibility by adapting the color temperature to local content characteristics.
2Object-affected harmful factors
If the color temperature is lowered to reduce blue emission, then eye fatigue is relieved, but the contrast of warm-colored characters deteriorates
Solution Approach 1:
The patent implements local quality by extracting character areas and applying different color temperature adjustments to different regions. Non-character areas and areas with non-warm-colored characters receive aggressive color temperature reduction for fatigue relief, while areas with warm-colored characters receive milder adjustment to maintain readability. This spatial differentiation resolves the contradiction between fatigue relief and readability preservation.
Solution Approach 2:
The patent employs color changes by detecting warm-colored characters and preserving their color characteristics through selective color temperature maintenance. The converter modifies color temperature parameters differently for warm-colored versus non-warm-colored characters, ensuring that warm-colored characters retain sufficient contrast while still achieving overall blue emission reduction. This color-based differentiation resolves the contradiction between fatigue relief and character readability.
Data Source
AI summary
An extraction unit determines whether, in a display area of a display unit in which content data obtained from an acquisition unit are displayed, there is a character area in which an area occupied by a character has a proportion greater than a predetermined value. Based on color information of the character in an area which is determined to be the character area by the extraction unit, a setting unit sets a target color temperature when the content data is displayed. A converter changes an original color temperature of the content data to the target color temperature, based on the target color temperature set by the setting unit.