Backlight Control Circuit Timing Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display screens, particularly LCD screens, experience flickering issues due to chaotic signal timing when quickly turned on and off, leading to unexpected backlight activation and screen flicker phenomena, which existing solutions cannot fully address.
Innovation Solution
A device and method for controlling backlight, comprising first and second controlling circuits that monitor power supply signals to accurately manage the turning on and off of the backlight module, ensuring it remains off until the display driving circuit is fully powered on, using a combination of transistors, diodes, capacitors, and resistors to stabilize signal timing and prevent premature activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the backlight module is turned on immediately when the display device is powered on, then the response speed is fast, but the screen flicker occurs due to chaotic signal timing
Solution Approach 1:
The patent applies preliminary action by introducing a delay circuit that activates the backlight module only after the display driving circuit has been fully powered on. The delay circuit monitors the power supply signal and generates a delayed control signal, ensuring that the backlight is turned on after the display circuit is ready, thus preventing signal timing chaos and screen flicker while maintaining fast response
2Reliability
If the backlight module is delayed to turn on after the display driving circuit is powered on, then the signal timing stability is improved, but the response speed decreases
Solution Approach 1:
The delay circuit is designed to activate the backlight as soon as the display driving circuit is ready, not after an unnecessary waiting period. The circuit monitors the power supply signal and generates a control signal with the precise delay needed for the display circuit to initialize, ensuring both timing stability and fast response by eliminating unnecessary delays
3Speed
If the backlight module turns off immediately when the display device is powered off, then the response speed is fast, but the screen flicker occurs during rapid on-off cycles
Solution Approach 1:
The patent applies preliminary anti-action by using the delay circuit to prevent the backlight from turning off immediately when the display device is powered off. The delay circuit ensures that the backlight remains on for a predetermined time period after the power supply signal indicates shutdown, preventing screen flicker during rapid on-off cycles while maintaining fast response to legitimate shutdown commands
4Reliability
If a delay circuit is introduced to control the backlight timing, then the screen flicker is reduced, but the device complexity increases
Solution Approach 1:
The patent uses an intermediary delay circuit that acts as a mediator between the power supply signal and the backlight control signal. This intermediary circuit simplifies the overall control logic by handling the timing delay function in a dedicated module, rather than requiring complex timing control throughout the entire system, thus reducing overall device complexity while effectively reducing screen flicker
Data Source
AI summary
Embodiments of the present disclosure provide a device and a method for controlling backlight, and a display device. The device for controlling backlight, comprising: a first controlling circuit configured to receive a first power supply signal for controlling a display device to be turned on or off, and generate an output signal for causing a backlight module of the display device to be turned off, in response to the first power supply signal being in a first status for controlling the display device to be turned off; and a second controlling circuit configured to receive the first power supply signal, and generate an output signal for causing the backlight module to be turned on again after being kept in a turned off state for a predetermined time period, in response to the first power supply signal being in a second status for controlling the display device to be turned on.