Display Controller Current Management for Power Saving
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Solution Overview
Problem
Display apparatuses that include a loudspeaker face challenges in reducing electric current consumption effectively, especially when in power saving mode, leading to potential excessive current flow in wire harnesses and frequent luminance decreases, making it difficult for users to watch images.
Innovation Solution
A display apparatus with a controller that performs electric current control processing based on image and sound information to manage the total electric current supplied to the display and loudspeaker, preventing excessive current flow by adjusting luminance and volume accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display is changed into power saving mode to decrease electric current consumption, then electric current consumption is reduced, but luminance decreases frequently making it difficult for users to watch images
Solution Approach 1:
The controller dynamically adjusts the luminance parameter of the display based on the combined electric current consumption of both the display and loudspeaker, rather than applying a fixed power saving mode. This allows for continuous parameter optimization to maintain acceptable luminance while reducing overall power consumption.
Solution Approach 2:
The system implements feedback control by continuously monitoring the electric current consumption and adjusting the luminance accordingly. The controller receives information about the loudspeaker's electric current consumption and uses this feedback to determine the appropriate luminance level, creating a closed-loop control system that prevents excessive power saving.
2Ease of operation
If the output from the loudspeaker is high even in power saving mode, then sound quality is maintained, but electric current greater than allowable electric current may flow in the wire harness
Solution Approach 1:
The controller merges the control of electric current for both the display and loudspeaker into a unified management system. By considering the combined electric current consumption of both components, the system ensures that the total current drawn from the wire harness does not exceed the allowable limit, even when the loudspeaker operates at high output.
3Use of energy by moving object
If frequent change into power saving mode is implemented to reduce electric current consumption, then electric current consumption decreases, but user experience deteriorates due to frequent luminance changes
Solution Approach 1:
The system transitions from static power saving modes to dynamic control where the luminance is continuously adjusted based on real-time electric current consumption data. This dynamic approach allows the system to respond smoothly to changing conditions without frequent abrupt transitions, thereby maintaining better user experience while achieving power consumption reduction.
Data Source
AI summary
A display apparatus includes a display, a loudspeaker and a controller. The controller is configured to: perform, based on one or both of (i) image information of an image that is displayed on the display, and (ii) sound information of sound that is output from the loudspeaker, electric current control processing that controls a sum of an electric current to be supplied to the display and an electric current to be supplied to the loudspeaker.