Display Power-Saving Mechanism Using Frame Data Comparison
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Solution Overview
Problem
Existing display power-saving mechanisms require manual user settings, leading to inefficient energy savings as they either fail to activate without preset parameters or shut off the display abruptly, causing inconvenience.
Innovation Solution
A smart power-saving system that automatically enters a power-saving mode by comparing frame data differences, using a power-saving control device with frame registers, an adder, and a comparator to output control signals for adjusting display and backlight settings, employing PWM or low-voltage DC techniques to modify backlight intensity and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a power-saving mechanism requires manual user presetting, then the user can control when power-saving mode activates, but the mechanism fails to save energy automatically when the user does not preset parameters
Solution Approach 1:
The display device automatically detects whether content is static or dynamic by comparing current frame data with previous frame data, and autonomously activates power-saving mode without requiring user intervention. The system serves itself by monitoring its own display content and making power-saving decisions independently.
Solution Approach 2:
The system performs preliminary frame data comparison and analysis before activating power-saving mode. By continuously comparing current frame data with stored previous frame data in advance, the system prepares to activate power-saving mode proactively when static content is detected, rather than waiting for user input or timeout events.
2Loss of energy
If the display shuts off completely after a long idle period per VESA standard, then power consumption is reduced, but the user experiences inconvenience due to abrupt shutdown during brief pauses
Solution Approach 1:
Instead of completely shutting off the display after a timeout period, the system applies partial power-saving action by detecting static frame content and activating power-saving mode earlier. This reduces the idle timeout threshold from a fixed long period to a dynamic decision based on frame comparison, achieving energy savings without requiring the user to wait for a long idle period or risk abrupt shutdown during brief pauses.
Solution Approach 2:
The system continuously monitors display content by comparing current frame data with previous frame data and uses this feedback to dynamically control power-saving mode activation. When the comparison detects no changes (static content), the system activates power-saving mode; when changes are detected (dynamic content), the system maintains normal operation. This closed-loop feedback mechanism eliminates the need for fixed timeout periods and prevents abrupt shutdowns during user interactions.
3Loss of energy
If the display enters power-saving mode based on fixed timeout periods, then power consumption is reduced, but the shutdown occurs too late to achieve optimal energy savings
Solution Approach 1:
The system replaces the mechanical timeout-based power-saving trigger with a content-based detection mechanism using frame data comparison. Instead of waiting for a fixed time period to elapse, the system substitutes this temporal mechanism with an analytical mechanism that compares current frame data with stored previous frame data to detect static content and immediately activates power-saving mode, achieving both faster response and optimal energy savings.
Data Source
AI summary
A display device includes an image receiving unit, a power-saving control device, a display control unit, and a backlight module control unit. The power-saving control device judges whether or not received frames are still for a predetermined time. If the power-saving control device judges that the received frames are still for the predetermined time, the power-saving control device outputs a first control signal to the display control unit for controlling the display panel to perform power saving to reduce its power consumption while continuing displaying frames, and the backlight module control unit controls the backlight module to continue providing the backlight; while if the received frames are not still or are still for a time shorter than the predetermined time, the power-saving control device does not output the first control signal to the display control unit for controlling the display panel to perform power saving to reduce its power consumption.