Display Image Adjustment via Ambient Light Sensor and Offset Correction
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Solution Overview
Problem
Conventional display apparatuses with backlight adjustment functions struggle to maintain stable image quality, particularly in varying illumination environments, as they often result in harsh bright scenes and distorted dark scenes due to manual adjustments and low backlight intensity.
Innovation Solution
An image adjusting method and display apparatus equipped with an ambient light sensor that automatically adjusts pixel backlight intensity and intensity offset values using an offset amending function, switching between displaying modes based on detected illumination to prevent overexposure and distortion, ensuring clear and comfortable viewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual backlight adjustment is used to vary the backlight of the image frame, then the display apparatus can adapt to different illumination environments, but the details of dark scenes become difficult to distinguish and image quality becomes unstable
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting multiple parameters including PWM duty cycle, intensity offset values, and gamma correction values based on detected ambient illumination levels. This multi-parameter adjustment enables the display to adapt to different lighting conditions while maintaining stable image quality and distinguishable dark scene details, resolving the contradiction between adaptability and image quality stability.
Solution Approach 2:
The patent implements feedback by using an ambient light sensor to detect surrounding illumination and feeding this information back to the controller, which then automatically adjusts backlight intensity and image parameters. This closed-loop feedback mechanism enables automatic adaptation to illumination changes without manual intervention, simultaneously achieving environmental adaptability and consistent image quality.
2Object-affected harmful factors
If backlight intensity is reduced to prevent overexposure in bright environments, then the display can adapt to dark environments, but the bright scenes become harsh and details are lost
Solution Approach 1:
The patent uses parameter changes by independently adjusting PWM duty cycle, intensity offset values, and gamma correction values to control different aspects of image brightness. This allows the system to prevent overexposure in bright environments while maintaining soft, comfortable viewing by avoiding excessive backlight reduction, thus preventing harsh bright scenes and preserving details.
Solution Approach 2:
The patent applies local quality by adjusting intensity offset values differentially for different pixel regions and brightness levels. This enables selective brightness control where bright scenes are softened through offset adjustment rather than uniform backlight reduction, preserving local image quality and preventing harshness while avoiding overexposure.
3Adaptability or versatility
If PWM value is adjusted to control pixel intensity, then the display can adapt to different lighting conditions, but flicker occurs and dark scene details become distorted
Solution Approach 1:
The patent applies parameter changes by adjusting multiple parameters simultaneously - PWM duty cycle for overall brightness control, intensity offset values for detail preservation, and gamma correction values for tone distribution. This multi-parameter coordination enables lighting adaptation while preventing flicker and distortion through balanced parameter adjustment rather than PWM alone.
Solution Approach 2:
The patent uses intensity offset values as an intermediary parameter between PWM brightness control and final image output. This intermediary offset adjustment mediates the relationship between PWM changes and image quality, preventing direct PWM-induced flicker and distortion while maintaining adaptability to lighting conditions.
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 method effectively corrects details in both bright and dark scenes by dynamically adjusting PWM values and intensity offset values, preventing flicker and maintaining image quality across different lighting conditions, resulting in a soft bright scene and clear dark scene without distortion.
Implementation Method 1
an ambient light sensor 14 and a controller 16... drive the ambient light sensor to detect the surrounding illumination
Data Source
AI summary
An image adjusting method is applied to a display apparatus having an ambient light sensor. The image adjusting method includes driving the ambient light sensor to detect surrounding illumination, adjusting PWM values of a plurality of pixels on the display apparatus according to the surrounding illumination, and adjusting intensity offset values of the plurality of pixels according to an offset amending function.