Backlight Control Region for Power Saving
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Solution Overview
Problem
Conventional display apparatuses cannot reduce power consumption of the backlight without degrading visibility, as darkening the entire backlight affects the display area viewed by the user.
Innovation Solution
A display apparatus comprising a sight line detection sensor, a distance measurement sensor, and a control unit that determines a control region on the display panel for adjusting light emission based on the detected sight line and measured distance, allowing for localized light control to reduce power consumption without affecting the user's visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the entire backlight is darkened to reduce power consumption, then power consumption is reduced, but the display part viewed by the user is also darkened which degrades visibility
Solution Approach 1:
The backlight is divided into multiple independently controllable light emitting parts or regions. The control unit selectively controls the luminance of each region based on whether it falls within the user's viewing field, allowing power-saving darkening of non-viewed regions while maintaining brightness in the viewed region.
Solution Approach 2:
Different regions of the backlight are assigned different luminance characteristics based on their location relative to the user's sight line. Regions within the viewing field maintain normal luminance for visibility, while regions outside the viewing field are darkened to reduce power consumption.
2Use of energy by moving object
If the entire backlight is darkened to reduce power consumption, then power consumption is reduced, but the display apparatus cannot perform backlight control in accordance with user's viewing field
Solution Approach 1:
The backlight control system dynamically adjusts the luminance of different regions based on real-time detection of the user's sight line and distance. The control region is not fixed but adapts to the user's viewing position, enabling the system to optimize power consumption while maintaining visibility according to actual viewing conditions.
Solution Approach 2:
The system uses a sight line detection sensor and distance measurement sensor to detect user viewing behavior, and the control unit uses this feedback information to dynamically adjust the backlight regions. This closed-loop control enables adaptive backlight adjustment that responds to user actions.
Data Source
AI summary
A display apparatus includes a sight line detection sensor that detects a sight line of a user; a distance measurement sensor that measures a distance between a display panel and a user; and a control unit that determines a control region set in separate light emitting parts arranged on the display panel, where an amount of light emission is controlled in the control region, based on the sight line detected by the sight line detection sensor and the distance measured by the distance measurement sensor. Typically, the control unit determines the control region in a manner such that the longer the distance measured by the distance measurement sensor, the smaller the control region, and the shorter the distance measured by the distance measurement sensor, the larger the control region.