Backlight Circuit Voltage Control via Energy Accumulation
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Solution Overview
Problem
The existing methods for controlling LED temperature in LCD display screens require additional sensors, complicating the structure and increasing manufacturing costs, as they need to modify the LCD display screen to detect temperature and adjust voltage accordingly.
Innovation Solution
A control method that uses dimming data to determine the total accumulated electric energy received by the backlight source, generating a voltage control signal to reduce the working voltage when the energy threshold is reached, without adding sensors or modifying the structure, allowing the backlight to maintain brightness while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is added to detect LED temperature, then LED temperature control is achieved, but the LCD display screen structure becomes more complicated and manufacturing cost increases
Solution Approach 1:
The system uses existing dimming data from the backlight control to calculate accumulated electric energy and infer temperature conditions, allowing the backlight circuit to self-monitor and self-regulate without external sensors. The controller calculates voltage control signals based on accumulated energy from dimming operations, enabling the system to serve its own monitoring needs.
Solution Approach 2:
The patent introduces accumulated electric energy as an intermediary parameter that mediates between dimming data and temperature control. Instead of directly measuring temperature with a sensor, the system uses accumulated energy calculation from existing dimming operations as an indirect indicator of LED thermal state, avoiding the need for physical temperature sensors.
2Reliability
If a sensor is added to detect LED temperature, then LED temperature control is achieved, but manufacturing cost increases
Solution Approach 1:
The system uses existing dimming data from the backlight control to calculate accumulated electric energy and infer temperature conditions, allowing the backlight circuit to self-monitor and self-regulate without external sensors. The controller calculates voltage control signals based on accumulated energy from dimming operations, enabling the system to serve its own monitoring needs.
Solution Approach 2:
The patent introduces accumulated electric energy as an intermediary parameter that mediates between dimming data and temperature control. Instead of directly measuring temperature with a sensor, the system uses accumulated energy calculation from existing dimming operations as an indirect indicator of LED thermal state, avoiding the need for physical temperature sensors.
3Reliability
If LED input voltage is reduced to prevent overheating, then LED damage is prevented, but brightness may be affected
Solution Approach 1:
The system dynamically adjusts LED working voltage based on real-time calculation of accumulated electric energy. Instead of static voltage reduction, the controller continuously monitors accumulated energy from dimming data and adjusts voltage control signals adaptively, allowing the LED to operate at full brightness when safe and reduce voltage only when accumulated energy indicates approaching thermal limits.
Solution Approach 2:
The patent implements a feedback mechanism where the controller calculates accumulated electric energy from dimming data and uses this information to generate appropriate voltage control signals. The system continuously monitors the accumulated energy state and adjusts voltage accordingly, creating a closed-loop control that protects LEDs while maintaining optimal brightness.
Data Source
AI summary
A control method for a backlight circuit includes: obtaining a plurality of pieces of dimming data in a preset period of time; determining total accumulated electric energy received by the backlight source according to the plurality of pieces of dimming data in the preset period of time; and generating a first voltage control signal when the total accumulated electric energy reaches a preset electric energy threshold. The dimming data is used to control a backlight source to emit light. The preset period of time is from an initial moment of continuous light emission of the backlight source to a current moment. The first voltage control signal is used to reduce the working voltage of the backlight source. When the total accumulated electric energy reaches the preset electric energy threshold, reducing the working voltage of the backlight source does not affect a light emitting brightness of the backlight source.