Display Timing Controller for Flicker-Free Power-Off
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Solution Overview
Problem
Display devices experience screen flicker or image sticking when turned on and off, particularly in areas displaying gradations from black to white, due to incomplete data signal suppression during power-off cycles.
Innovation Solution
A display device configuration that includes a power supply unit, a voltage monitor unit to detect output voltage cutoff, and a timing controller to convert all gate signals into a gate-on voltage and all data signals into a black data signal in response to the alarm signal, ensuring uniform shutdown and preventing image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the data signal is supplied immediately before turn-off of the display device, then the shutdown process is completed quickly, but screen flicker and image sticking are generated in the display panel
Solution Approach 1:
The timing controller detects the alarm signal indicating power-off status and proactively generates a gate control signal to convert all gate signals into gate-on voltage before the actual power cutoff occurs. This preliminary action ensures that all subpixels are uniformly turned off, preventing screen flicker and image sticking while maintaining quick shutdown
Solution Approach 2:
The timing controller acts as an intermediary between the power supply unit and the display panel. It monitors the alarm signal from the power supply and intervenes by generating control signals to convert residual data signals into black data signals, thereby mediating the transition during power-off to prevent display artifacts
2Device complexity
If the gate signal and data signal are supplied simultaneously during turn-off, then the power-off process is simplified, but incomplete data signal suppression causes image sticking in specific areas
Solution Approach 1:
The timing controller uses feedback from the alarm signal indicating power-off status to adjust its control signals. Upon detecting the alarm signal, it generates a gate control signal to convert all gate signals into gate-on voltage and ensures data signals are converted to black data signals, creating a feedback-based control mechanism that maintains display uniformity during shutdown
Solution Approach 2:
The timing controller changes the parameter state of the data signal by converting it from its original state to a black data signal state upon detecting the alarm signal. This parameter transformation ensures uniform suppression of all data signals regardless of their previous values, preventing image sticking while maintaining simple control architecture
Data Source
AI summary
A display device includes a display panel, a data driver supplying a data signal to the display panel, a gate driver supplying a gate signal to the display panel, a power supply unit supplying electric power to at least one of the display panel, the data driver, and the gate driver, a voltage monitor unit which monitors an output voltage output from the power supply unit and outputs an alarm signal when the output voltage is cut off, and a timing controller which outputs a gate control signal converting all of gate signal output from the gate driver into a gate-on voltage and a data control signal converting all of the data signal output from the data driver into a black data signal in response to the alarm signal.