Backlight Current Control for Flat Panel Battery Protection
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Solution Overview
Problem
Flat panel electronic devices face battery life reduction and potential damage due to peak current exceeding maximum allowable discharge current, with existing power capping mechanisms requiring complex calculations and lengthy processing times.
Innovation Solution
A current control system that detects current in the main circuit and reduces the backlight unit's brightness when the current exceeds a threshold, using a comparator and backlight regulator to quickly lower the current below the threshold, thereby preventing battery damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frequencies of the processor and communication chip are reduced to lower peak current, then the current exceeds the maximum allowable discharge current, but the processing speed reduces and response time extends
Solution Approach 1:
The patent extracts the backlight unit as a separate controllable component from the main circuit. By independently controlling the backlight current through a dedicated detection module and control circuit, the system can reduce peak current without affecting processor or communication chip frequencies, thus maintaining processing speed while ensuring battery safety
Solution Approach 2:
The patent changes the parameter being controlled from processor frequency to backlight brightness level. When peak current exceeds the threshold, the system adjusts the backlight current parameter rather than the processor frequency parameter, achieving current reduction without sacrificing processing performance
2Reliability
If complex calculation processes are used to reduce peak current, then the current control is more precise, but the processing time increases from tens to hundreds of milliseconds
Solution Approach 1:
The patent implements preliminary action by continuously monitoring the main circuit current through the detection module and pre-establishing a threshold value. When the current approaches the threshold, the control circuit immediately responds by adjusting the backlight current, eliminating the need for complex real-time calculations and reducing response time to under 10 milliseconds
Solution Approach 2:
The patent establishes a feedback loop where the detection module continuously monitors current and feeds this information to the control circuit. The control circuit compares the detected current with the threshold and automatically adjusts the backlight current accordingly, creating a simple yet effective closed-loop control system that responds rapidly without complex computations
3Reliability
If the backlight brightness is reduced to lower current, then the peak current is reduced below the threshold, but the display quality deteriorates
Solution Approach 1:
The patent implements dynamic control of the backlight brightness rather than a fixed reduction. The backlight current is adjusted in real-time based on the main circuit current levels, allowing the display to maintain optimal brightness during normal operation while automatically dimming only when peak current threatens battery safety, thus balancing display quality with battery protection
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
The system reduces processing time by more than 10 ms, effectively extending battery life with a simple control mode and low component count, while preventing battery damage from excessive current.
Implementation Method 1
a detecting module for detecting a current in a main circuit of the flat panel electronic device; the detecting module is connected to the main circuit of the flat panel electronic device in parallel, and the detecting module obtains the current in the main circuit by detecting a branch current
Implementation Method 2
a control mechanism for reducing a brightness level of a backlight unit of the flat panel electronic device when the current in the main circuit is larger than or equal to a threshold so that the current in the main circuit is reduced to be less than the threshold; the control mechanism reduces the brightness level of the backlight unit by reducing the current of the backlight unit
Data Source
AI summary
Embodiments of the present invention provide a flat panel electronic device and a current control system thereof. The current control system comprises: a detecting module for detecting a current in a main circuit of the flat panel electronic device; and a control mechanism for reducing a brightness level of a backlight unit of the flat panel electronic device when the current in the main circuit is larger than or equal to a threshold so that the current in the main circuit is reduced to be less than the threshold. The current control system provided by the present invention reduces the current in the main circuit by reducing the brightness level of the backlight unit. Therefore, it is able to reduce the processing time by more than 10 ms compared with the prior art, and the fast and effective response is an important factor for extending the life of the battery.