Viewer-Directed Display Backlight for Lower Power Consumption
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Solution Overview
Problem
Existing display technologies waste light by emitting it in directions where no viewer is present, despite achieving power savings through local dimming and viewer-aware technologies.
Innovation Solution
A display device with a backlight, light beam control unit, display panel, viewer position recognition, and light emission control unit that adjusts light emission direction and intensity based on viewer position, using lenses and sensors to direct light only towards the viewer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light is emitted from all light-emitting units uniformly, then visibility of displayed video is maintained, but power consumption increases due to wasted light in directions where no viewer is present
Solution Approach 1:
The patent applies local quality by controlling each light-emitting unit to emit light in specific directions toward the viewer position rather than uniformly in all directions. The light emission control unit adjusts the emission characteristics of individual light-emitting units based on the viewer's position, making the light distribution non-uniform and viewer-specific. This resolves the contradiction by directing light only where needed (toward the viewer) while maintaining visibility, thereby reducing power consumption.
Solution Approach 2:
The patent implements dynamics by making the light emission pattern adjustable and adaptive based on viewer position. The system transitions from a static uniform emission mode to a dynamic viewer-dependent emission mode. The light emission control unit continuously adjusts which light-emitting units are active and their emission directions based on real-time viewer position detection, allowing the display to adapt its optical characteristics to the viewing situation and reduce energy waste.
2Use of energy by moving object
If light emission is controlled to direction based on viewer position, then power consumption is reduced, but device complexity increases due to additional control units and sensors
Solution Approach 1:
The patent applies segmentation by dividing the backlight into multiple independently controllable light-emitting units. Each light-emitting unit can be individually controlled to emit light in specific directions, allowing fine-grained control of light distribution. This segmentation enables the system to direct light precisely toward the viewer position while maintaining manageable complexity through modular control of discrete units rather than requiring complete redesign of the entire lighting system.
Solution Approach 2:
The patent introduces a light emission control unit as an intermediary component between the light-emitting units and the viewer position detection system. This control unit processes viewer position information and translates it into appropriate control signals for the light-emitting units, managing the complexity centrally rather than distributing it throughout the system. The intermediary approach simplifies the overall control architecture while achieving directionally controlled light emission for power savings.
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
Reduces power consumption by directing light only to the viewer, maintaining visibility and allowing multiple viewers without increasing power usage.
Implementation Method 1
The light beam control unit controls light that has entered from each of the plurality of light-emitting units to travel in a direction corresponding to a position of the light-emitting unit that is a light source and emits the light
Implementation Method 2
the purpose of the light distribution control is to cause a group of light beams emitted from the light source to substantially enter a corresponding unit of the light beam control unit and make the luminance of the entire screen of a group of light beams that have been transmitted through the light beam control unit uniform at a viewer position
Data Source
AI summary
[Object] To provide a display device, a display control method, and a display control program that are capable of reducing power consumption without deteriorating the visibility of displayed video.[Solving Means] A display device according to the present technology includes: a backlight (111); a light beam control unit (112); a display panel (113); a viewer position recognition unit; and a light emission control unit. The backlight (111) includes a plurality of light-emitting units. The light beam control unit (112) controls light that has entered from each of the plurality of light-emitting units to travel in a direction corresponding to a position of the light-emitting unit that is a light source and emits the light. The display panel (113) has a display surface (113a), the light that has entered from the light beam control unit being transmitted through the display panel (113a) and emitted from the display surface (113a). The viewer position recognition unit recognizes a viewer position that is a position of a viewer with respect to the display surface (113a). The light emission control unit controls each of the light-emitting units on a basis of a direction in which light from each of the light-emitting units as a light source is emitted from the display surface (113a) and the viewer position.