Display Light-Source Control for Ambient-Light Brightness Differences
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Solution Overview
Problem
Ambient-light illuminance differences on display surfaces, caused by shadows or bright light sources, lead to distorted and washed-out images, affecting user experience.
Innovation Solution
A system with light sensors and light sources on the display's backside adjusts luminous emittance to equalize luminance differences across regions, using calibration data to compensate for varying ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ambient light sensors detect illuminance differences across display regions, then spatial luminance uniformity can be improved, but device complexity increases due to additional sensor arrays and control circuitry
Solution Approach 1:
The display surface is divided into multiple regions with different ambient illuminance conditions. Light sensor arrays are segmented and positioned at specific locations (e.g., top and bottom edges) to detect illuminance in different regions independently. This allows localized compensation for ambient light variations without requiring sensors across the entire display surface, thus improving luminance uniformity while controlling complexity.
Solution Approach 2:
Light sources are introduced as intermediary elements between the ambient environment and the display surface. These light sources emit light onto the display to compensate for ambient illuminance differences in specific regions. The controller acts as an intermediary that processes sensor data and adjusts light source output accordingly, creating a feedback loop that maintains luminance uniformity without directly modifying the display panel itself.
2Illumination intensity
If light sources are added to compensate for ambient light variations, then image quality can be improved, but energy consumption increases
Solution Approach 1:
The system performs periodic measurements of ambient illuminance using light sensor arrays and adjusts light source output in real-time based on detected conditions. The controller continuously monitors illuminance differences and modulates light source intensity accordingly, creating a dynamic feedback system that compensates for ambient light variations only when needed, rather than operating at constant high energy consumption.
Solution Approach 2:
Light sources are positioned and controlled to provide localized illumination compensation only in regions where ambient illuminance differences are detected. The system does not uniformly illuminate the entire display surface, but rather targets specific regions requiring compensation, thereby improving image quality in affected areas while minimizing overall energy consumption.
3Measurement precision
If multiple light sensors are positioned at different locations, then measurement precision of ambient illuminance can be improved, but device complexity increases
Solution Approach 1:
The light sensing function is segmented into multiple discrete sensor arrays positioned at strategic locations around the display (e.g., top edge, bottom edge). Each sensor array independently measures ambient illuminance in its local region. This segmentation allows precise detection of spatial illuminance variations without requiring a continuous sensor layer across the entire display, balancing measurement precision with manageable device complexity.
Solution Approach 2:
The light sensor arrays serve multiple functions: they detect ambient illuminance levels, determine spatial distribution patterns of ambient light, and provide data for controller algorithms that adjust light source output. This multi-functionality maximizes the utility of each sensor element, improving measurement precision while minimizing the number of components required.
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 system effectively reduces spatial luminance differences, ensuring a uniformly displayed image by compensating for ambient-light variations, enhancing user perception.
Implementation Method 1
receive a sensor output from each light sensor in the light sensor array
Implementation Method 2
a light source array of light sources may emit light to display an image on the display
Data Source
AI summary
An apparatus includes a display, a memory, a light sensor array and a light source array. The light source array emits light to display an image on the display. A controller is configured to receive a sensor output from each light sensor in the light sensor array. An ambient-light illuminance difference between a first illuminance of a first ambient light externally directed onto a first region of the displayed image of the display and a second illuminance of a second ambient light externally directed respectively onto a second region of the displayed image of the display is computed. Light source controls of light sources of the light source array are varied to change a luminous emittance of the light source array within the at least one second region of the displayed image so as to reduce a luminance difference between the first region and the second region of the displayed image.