Adjustable Display Backlight for Narrow Viewing Angle Control
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Solution Overview
Problem
Display devices with backlights often suffer from inconsistent visual output quality at various viewing angles, leading to reduced brightness, contrast, and color saturation for users not directly in front of the display, which can be a drawback in both privacy and power consumption aspects.
Innovation Solution
Incorporating adjustable backlight configurations, such as a combination of wide-beam and narrow-beam lamps, or using an electrowetting electrode as a collimator, to dynamically control the viewing angle, allowing for power conservation and improved privacy by narrowing the viewing angle when needed, while maintaining high quality for direct viewers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight is configured to provide wide viewing angle, then the visual presentation quality is improved for users at various angles, but the power consumption increases
Solution Approach 1:
The backlight system dynamically adjusts its configuration based on viewing angle requirements. The patent implements adjustable viewing angle capability where the backlight can switch between wide-angle and narrow-angle modes, allowing the system to optimize power consumption by using narrow-beam lighting when direct viewing is expected, while switching to wide-beam lighting when broader viewing angles are needed.
Solution Approach 2:
The system changes the optical parameters of the backlight by adjusting the beam angle distribution. Through configurable backlight elements (such as LEDs with adjustable viewing angles or liquid crystal display panel settings), the system modifies the light emission characteristics to match the actual usage scenario, thereby optimizing the balance between visual quality and power consumption.
2Use of energy by moving object
If the viewing angle is narrowed to conserve power, then power consumption is reduced, but the visual presentation quality deteriorates for users not directly in front
Solution Approach 1:
The backlight system dynamically adjusts its configuration based on viewing angle requirements. The patent implements adjustable viewing angle capability where the backlight can switch between wide-angle and narrow-angle modes, allowing the system to optimize power consumption by using narrow-beam lighting when direct viewing is expected, while switching to wide-beam lighting when broader viewing angles are needed.
Solution Approach 2:
The system changes the optical parameters of the backlight by adjusting the beam angle distribution. Through configurable backlight elements (such as LEDs with adjustable viewing angles or liquid crystal display panel settings), the system modifies the light emission characteristics to match the actual usage scenario, thereby optimizing the balance between visual quality and power consumption.
3Illumination intensity
If the viewing angle is expanded to improve visual presentation, then the visual output quality is improved, but the privacy of the user is reduced
Solution Approach 1:
The backlight system dynamically adjusts its configuration based on viewing angle requirements. The patent implements adjustable viewing angle capability where the backlight can switch between wide-angle and narrow-angle modes, allowing the system to optimize power consumption by using narrow-beam lighting when direct viewing is expected, while switching to wide-beam lighting when broader viewing angles are needed.
Solution Approach 2:
The system changes the optical parameters of the backlight by adjusting the beam angle distribution. Through configurable backlight elements (such as LEDs with adjustable viewing angles or liquid crystal display panel settings), the system modifies the light emission characteristics to match the actual usage scenario, thereby optimizing the balance between visual quality and power consumption.
4Object-affected harmful factors
If the viewing angle is narrowed to improve privacy, then the privacy is improved, but the visual presentation quality deteriorates for direct viewers
Solution Approach 1:
The backlight system dynamically adjusts its configuration based on viewing angle requirements. The patent implements adjustable viewing angle capability where the backlight can switch between wide-angle and narrow-angle modes, allowing the system to optimize power consumption by using narrow-beam lighting when direct viewing is expected, while switching to wide-beam lighting when broader viewing angles are needed.
Solution Approach 2:
The system changes the optical parameters of the backlight by adjusting the beam angle distribution. Through configurable backlight elements (such as LEDs with adjustable viewing angles or liquid crystal display panel settings), the system modifies the light emission characteristics to match the actual usage scenario, thereby optimizing the balance between visual quality and power consumption.
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
This solution enables adjustable viewing angles, optimizing power consumption and privacy by reducing light emission at non-zero angles, thereby extending battery life while ensuring high-quality display for users directly in front of the device.
Implementation Method 1
an electrowetting electrode may be included to serve as an adjustable collimator that narrows or expands the orientation of light passing through the liquid crystal array based on a variable electric voltage
Data Source
AI summary
Display components (e.g., liquid crystal displays (LCDs)) are viewable at different viewing angles, for example, by a first user positioned directly in front of the display and by a second user positioned to one side of the display. Many displays present a consistent display across a wide range of viewing angles, but these displays may consume energy and/or compromise user privacy. Presented herein are configurations of backlights for display devices featuring an adjustable viewing angle, such that a user may select a narrower viewing angle in usage scenarios involving power consumption or privacy, and may select a wider viewing angle in usage scenarios involving plentiful power and fewer privacy concerns. Such configurations may include multiple banks of backlight lamps generating backlight at different viewing angles; an electrowetting electrode as an adjustable collimator; adjustable diffusers that may adjustably scatter light passing therethrough; and/or a combination of such adjustable elements.