Temperature-Feedback Light Source Control for Overheating Displays
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Solution Overview
Problem
Liquid crystal display apparatuses face overheating issues due to heat generation by driving circuits and backlight sources, which can lead to abnormal operation or damage.
Innovation Solution
A control circuit that generates a current signal correlated with temperature, converting it into a voltage signal to control light source brightness, with a comparison circuit adjusting the brightness based on temperature to prevent overheating, and includes a turn-off mechanism to protect the display from excessive temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source brightness is increased to improve display quality, then the illumination intensity is improved, but the temperature of the display apparatus increases
Solution Approach 1:
The patent implements a temperature feedback mechanism where a temperature detection circuit continuously monitors the display apparatus temperature and feeds this information to the control circuit. The control circuit adjusts the light source brightness based on the detected temperature, creating a closed-loop control system that dynamically balances display quality and thermal management
Solution Approach 2:
The control circuit changes the operating parameters of the light source based on temperature conditions. When temperature exceeds a threshold, the circuit reduces the current or duty cycle supplied to the light source, thereby lowering its brightness and reducing heat generation. This dynamic parameter adjustment resolves the contradiction between maintaining high brightness and controlling temperature
2Productivity
If the driving circuit operates at high power to improve display performance, then the productivity is improved, but the temperature of the display apparatus increases
Solution Approach 1:
The temperature detection circuit provides continuous feedback to the control circuit about the display apparatus temperature. The control circuit uses this feedback to dynamically adjust the power supplied to the driving circuit, reducing power consumption and heat generation when temperature thresholds are exceeded, thus maintaining productivity while preventing overheating
Solution Approach 2:
The system transitions from a static high-power operating mode to a dynamic power management mode. The control circuit continuously adjusts the driving circuit power based on real-time temperature conditions, enabling the display to operate at high performance when cool and reduce power consumption when temperature rises, resolving the contradiction between productivity and thermal management
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
Effectively regulates light source brightness to manage temperature, preventing damage to the display apparatus by reducing brightness as temperature increases and turning off the display when necessary to prevent overheating.
Implementation Method 1
a current source circuit configured to generate a current signal whose magnitude is positively correlated with a temperature of a region where the control circuit is located
Implementation Method 2
a conversion circuit coupled to the current source circuit and configured to convert the current signal generated by the current source circuit into a voltage signal
Implementation Method 3
a first comparison circuit coupled to the conversion circuit and configured to output a control signal for controlling brightness of a light source according to the voltage signal received from the conversion circuit
Data Source
AI summary
The present disclosure provides a control circuit, a light source driving device and a display apparatus. The control circuit comprises a current source circuit configured to generate a current signal having a magnitude positively correlated with a temperature of a region where the control circuit is located; a conversion circuit coupled to the current source circuit and configured to convert the current signal generated by the current source circuit into a voltage signal; and a first comparison circuit coupled to the conversion circuit and configured to output a control signal for controlling brightness of a light source according to the voltage signal received from the conversion circuit, a magnitude of the control signal being negatively correlated with the temperature of the region where the control circuit is located, and the brightness of the light source being positively correlated with the magnitude of the control signal.