Runtime Contrast and Brightness Adjustment for Daylight Readability
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Solution Overview
Problem
Conventional electronic devices face challenges in maintaining screen readability in daylight conditions, as brightness adjustments alone are insufficient to counteract the impact of varying ambient lighting, leading to difficulties in reading text and graphics, especially in direct sunlight, and can adversely affect battery life.
Innovation Solution
The system and method involve determining ambient lighting conditions to adjust both contrast and brightness levels dynamically, applying specific contrast and brightness settings based on pre-configured mappings to enhance readability, with contrast adjustments being adaptable to different applications and implemented during graphics and video processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If brightness adjustments alone are used to improve screen readability in daylight, then screen visibility is improved, but battery life is adversely affected
Solution Approach 1:
The patent changes multiple display parameters simultaneously - specifically contrast ratio and color temperature - rather than relying solely on brightness adjustments. By adjusting the contrast ratio (darkening backgrounds, lightening text) and shifting color temperature toward cooler tones in daylight conditions, the patent achieves improved readability without requiring maximum brightness levels, thereby conserving battery energy.
2Illumination intensity
If brightness is increased to counteract ambient lighting, then screen readability is improved, but the impact of varying ambient lighting is insufficiently counteracted
Solution Approach 1:
The patent employs dynamic adjustment of multiple display parameters including contrast ratio and color temperature based on detected ambient lighting conditions. This multi-parameter approach provides more effective compensation for varying ambient light than brightness alone, ensuring consistent readability across different lighting environments.
Solution Approach 2:
The system continuously monitors ambient lighting conditions and dynamically adjusts display parameters in response. This closed-loop feedback mechanism ensures that the display adapts to changing environmental conditions, maintaining optimal readability whether the device is used in bright sunlight, indoor lighting, or dim environments.
Data Source
AI summary
Display functions in an electronic device may comprise combining runtime color adjustments with brightness adjustments triggered by ambient light detection. Light sensors may be utilized to detect ambient lighting conditions, which may cause adjustment of brightness level applicable to a display (or screen) of the electronic device. The adjustment of brightness level may then be combined with adjustment of contrast level that may also be applicable to display functions. In this regard, a particular contrast level may be selected based on the detected ambient lighting conditions—e.g., by mapping various contrast levels to preconfigured ambient lighting levels. The contrast adjustment may comprise adjusting colors and/or sharpness. Using contrast adjustments, in conjunction with the brightness adjustments, may allow for achieving the same levels of readability with less brightness, and/or for increased readability with the same brightness.