Display Luminance Compensation via Reflected Light Detection
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Solution Overview
Problem
Flat panel display devices face challenges in maintaining high contrast due to ambient light, particularly due to specular reflection from their surfaces, which affects user vision and requires luminance adjustment.
Innovation Solution
A display device comprising a camera, photo sensor, and control unit that determines the viewing angle of a user, calculates the intensity of reflected light, and compensates luminance by adjusting gamma values to account for specular reflection, thereby improving visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If flat panel display devices are used to reduce weight and volume, then portability and compactness are improved, but contrast ratio deteriorates due to incident ambient light
Solution Approach 1:
The system performs preliminary detection of ambient light conditions and user viewing angle before displaying content, then pre-compensates the luminance values to counteract the expected glare effect, ensuring optimal contrast from the start
Solution Approach 2:
The system dynamically changes display parameters (luminance compensation values) based on detected ambient light intensity and viewing angle, adjusting the gamma correction curve to maintain contrast ratio under varying environmental conditions
2Adaptability or versatility
If ambient light sensing is implemented to adjust luminance, then adaptability to ambient conditions is improved, but device complexity increases due to additional sensors and control units
Solution Approach 1:
The camera module serves dual purposes: capturing images for user identification and detecting ambient light conditions for luminance compensation, eliminating the need for a separate light sensor and reducing overall device complexity
Solution Approach 2:
The system continuously monitors ambient light conditions and user viewing angle, then feeds this information back to dynamically adjust display luminance parameters, creating a closed-loop control system that adapts to changing environmental conditions
3Illumination intensity
If luminance compensation based on viewing angle is implemented, then visibility under specular reflection is improved, but measurement precision requirements increase for accurate pupil detection
Solution Approach 1:
The system uses simplified pupil detection that identifies only the essential viewing angle information needed for luminance compensation, rather than performing exhaustive eye tracking, achieving sufficient precision for the intended purpose without excessive complexity
Solution Approach 2:
The system introduces a lookup table or pre-calculated compensation curves as an intermediary between pupil detection and luminance adjustment, translating imprecise viewing angle measurements into accurate luminance compensation values
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 solution effectively adjusts luminance to counteract the impact of specular reflection, enhancing visibility by considering the intensity of reflected light and ambient conditions, thereby improving the overall display experience.
Implementation Method 1
The photo sensor is spaced apart from the camera and is configured to sense ambient light incident on the front side of the display device
Implementation Method 2
light reflected from a surface of the display device may also affect vision of a user
Data Source
AI summary
A display device includes: a display unit configured to display an image; a camera spaced apart from the display unit and facing a front side of the display device; a photo sensor spaced apart from the camera and configured to sense ambient light incident on the front side of the display device; and a control unit coupled to the display unit, the camera, and the photo sensor. The control unit includes: a viewing angle determining unit configured to recognize a face of a user from an image photographed by the camera so as to determine a viewing angle of the user; a reflection intensity calculating unit configured to calculate intensity of reflected light based on intensity of symmetric light incident at an angle symmetric to the viewing angle; and a luminance compensation unit configured to compensate luminance of input video data in consideration of the intensity of the reflected light.