Liquid Crystal Panel Driving Circuit Stabilization
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Solution Overview
Problem
Existing liquid crystal display systems experience display abnormalities due to unexpected signals from source drivers during initial power on/off, leading to unintended image data on the panel, caused by static current flowing in source drivers.
Innovation Solution
A liquid crystal panel driving circuit with output buffers, an output MUX switch, a garbage switch, and power sensors that cut off power input to output buffers during garbage processing, ensuring outputs from source drivers reach ground voltage levels, preventing static current and stabilizing the display during power on/off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If source drivers operate during initial power on/off, then normal data signal transmission is enabled, but unexpected signals are output causing display abnormalities
Solution Approach 1:
The garbage switch connects data lines to ground terminals before normal operation begins during power on/off sequences. This preliminary grounding action ensures that any unexpected signals from source drivers are immediately directed to ground voltage levels, preventing display abnormalities before they can manifest
Solution Approach 2:
The output MUX switch acts as an intermediary between output buffers and data lines, controlling signal flow during power on/off sequences. By coordinating with the garbage switch, it ensures that outputs from source drivers are properly directed to ground voltage levels, mediating the harmful effect of unexpected signals
2Reliability
If power is supplied to output buffers during garbage processing, then normal data voltage buffering is enabled, but static current flows causing ground voltage level changes
Solution Approach 1:
The power switch cuts off power input to output buffers before garbage processing operations begin during power on/off sequences. This preliminary power cutoff prevents static current from flowing in source drivers, thereby preventing ground voltage level changes and ensuring stable display operation
Solution Approach 2:
The power switch extracts and removes the power supply connection from output buffers during garbage processing operations. By selectively removing power input only when needed (during power on/off garbage processing), the circuit eliminates static current consumption while maintaining normal operation during regular data transmission
3Reliability
If garbage processing is performed during power on/off, then display abnormalities are removed, but static current flows in source drivers
Solution Approach 1:
The garbage switch serves as an intermediary that connects data lines to ground terminals during garbage processing operations. This intermediary connection ensures that garbage signals are properly directed to ground voltage levels, enabling display stabilization while preventing static current from causing harmful effects
Solution Approach 2:
The power switch extracts power input from output buffers during garbage processing operations, removing the source of static current while allowing garbage processing to continue. This extraction eliminates the harmful static current effect while preserving the beneficial display stabilization function
Data Source
AI summary
Disclosed is a liquid crystal panel driving circuit of display stabilization, including: a plurality of output buffers buffering data voltage and supplying or cutting off the buffered data voltage to or from each of the plurality of data lines; an output MUX switch receiving outputs from two adjacent output buffers of the plurality of output buffers and transferring one of the two outputs to the plurality of data lines; a garbage switch connecting each of the plurality of data lines to a ground terminal; and a power on sensor or a power off sensor generating a power on or off reset signal in response to a turn on/off of a power supply voltage, wherein the output MUX switch is turned-off and the charge share switch and the garbage switch are turned-on, in response to the power on reset signal or the power off reset signal.