Backlight Current Control for Display Thermal Management
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Solution Overview
Problem
Display devices face challenges in maintaining optimal operation temperatures due to heat dissipation limitations by fans, leading to potential damage from excessive temperature increases, especially under high brightness conditions.
Innovation Solution
A processor in the electronic device averages current values of the backlight module and adjusts them by generating an adjusted maximum current value when necessary, reducing the current values to manage temperature without additional sensors, thus maintaining the device within a stable temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the rotation speed of the fan is increased to dissipate heat, then the heat dissipation efficiency is improved, but noise increases and the rotation speed is restricted by an upper limit
Solution Approach 1:
The patent replaces the mechanical fan-based heat dissipation system with an electrical control system that adjusts backlight module current. The processor monitors temperature and dynamically adjusts the current values of the backlight module, substituting mechanical fan operation with electrical current control to achieve heat management without noise-generating moving parts.
2Temperature
If the rotation speed of the fan is increased to dissipate heat, then the heat dissipation efficiency is improved, but the heat dissipation efficiency is restricted by the upper limit of the rotation speed
Solution Approach 1:
The patent changes the operational parameters of the backlight module by dynamically adjusting current values based on temperature conditions. The processor averages current values over a first time period, compares them against thresholds, and adjusts maximum current values accordingly. This parameter adjustment approach enables heat management without relying on fan speed increases, effectively bypassing the heat dissipation capability limitations imposed by fan rotation speed upper bounds.
3Measurement precision
If additional temperature sensors are added to detect temperature, then the temperature detection accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the existing backlight module current control system multi-functional by having it perform both its primary function of providing display backlighting and a secondary function of temperature management. The processor utilizes existing current value data from the backlight module to infer temperature conditions, eliminating the need for separate temperature sensors. This universal approach allows one system to serve multiple purposes without increasing device complexity.
4Measurement precision
If additional temperature sensors are added to detect temperature, then the temperature monitoring capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent enables the backlight module system to self-monitor and self-regulate temperature conditions without requiring external temperature sensors. The processor uses existing current value measurements from the backlight module to determine temperature status and automatically adjusts current values to maintain appropriate operating temperatures. This self-service approach eliminates additional component costs while maintaining effective temperature monitoring and control.
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
This method dynamically adjusts the backlight module's current values to maintain the display device's temperature within a preset range, preventing damage and ensuring stable operation without increasing costs or using additional sensors.
Implementation Method 1
The display panel is configured to display image data and includes a backlight module
Implementation Method 2
reducing current values of the backlight module in a second time period according to the adjusted maximum current value, to reduce a temperature of the electronic device
Data Source
AI summary
An electronic device is provided, including a display panel and a processor. The display panel is configured to display image data and includes a backlight module, and the processor is electrically connected to the display panel. The processor averages current values of the backlight module corresponding to the image data in a first time period, to generate an average current value, and compares the average current value with a current threshold. When the average current value is greater than the current threshold, the processor generates an adjusted maximum current value, and correspondingly reduces current values of the backlight module in a second time period according to the adjusted maximum current value, to reduce a temperature of the electronic device. A temperature adjustment method of an electronic device is also provided.