Variable Scan Driving Signal for Display Panel RC Loading
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Solution Overview
Problem
Active matrix display apparatuses face issues with scan signal delay and deformation due to parasitic capacitances and loading impedance, especially in large-size, high-definition, and 3D displays, leading to sampling errors and increased power consumption and stress on pixel switch devices.
Innovation Solution
A display driving method that determines specific target-level voltages and switch times based on the RC loading of scan lines, using precharge-level voltages to rapidly drive the display panel, reducing signal delay and power consumption by varying the scan driving signal levels and switch times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional scan driving signal is used to drive large-size high-definition display panels, then the display can be manufactured with high definition and large size, but signal delay and deformation occur due to parasitic capacitances and loading impedance
Solution Approach 1:
The patent applies dynamics by making the scan driving signal adaptive rather than fixed. The signal waveform dynamically adjusts its parameters (voltage levels, precharge duration, hold time) based on real-time detection of RC loading characteristics for each scan line, allowing the system to optimize signal integrity for each specific line while maintaining high definition display capabilities
Solution Approach 2:
The patent changes multiple signal parameters including precharge-level voltage, target-level voltage, precharge time, and hold time to compensate for RC loading effects. By varying these parameters based on detected RC characteristics, the system corrects signal delay and deformation while preserving the high definition manufacturing capability
2Reliability
If the scan signal voltage is increased to overcome signal delay, then signal integrity improves, but power consumption and stress on pixel switch devices increase
Solution Approach 1:
The patent optimizes voltage parameters by using just enough voltage to overcome RC loading effects rather than uniformly high voltage. The precharge-level voltage and target-level voltage are precisely calculated based on detected RC characteristics, minimizing power consumption while ensuring signal integrity is maintained
Solution Approach 2:
The patent applies preliminary precharge action before the main scan signal transition. By precharging the scan line to an appropriate voltage level based on RC detection, the system reduces the voltage swing required for the main transition, thereby reducing power consumption while maintaining signal integrity
3Reliability
If the scan signal voltage is increased to ensure proper switching, then reliable pixel operation is achieved, but stress effect on pixel switch devices increases
Solution Approach 1:
The patent optimizes voltage parameters including precharge-level voltage and target-level voltage based on detected RC characteristics. This ensures reliable pixel switching by providing sufficient voltage to overcome parasitic effects while minimizing excess voltage that would increase stress on pixel switch devices
4Reliability
If precharge time is extended to ensure proper signal levels, then signal accuracy improves, but scan time per line increases reducing display refresh rate
Solution Approach 1:
The patent optimizes the precharge time parameter based on detected RC loading characteristics. By calculating the appropriate precharge duration for each scan line's specific RC properties, the system achieves sufficient signal accuracy without unnecessarily extending the precharge period, thereby maintaining high display refresh rates
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
This approach minimizes signal delay, reduces power consumption, and decreases the stress on pixel switch devices by optimizing the scan driving signal waveform, ensuring stable and efficient operation of large-size, high-definition displays.
Implementation Method 1
determining a first switch time and a second switch time according to an RC loading of the scan line
Data Source
AI summary
A display driving method comprises the steps of: determining a first target-level voltage and a second target-level voltage of a signal of the scan line; determining a first switch time and a second switch time according to an RC loading of the scan line; determining at least one first precharge-level voltage and at least one second precharge-level voltage according to the first target-level voltage, the second target-level voltage, the first switch time, and the second switch time; and outputting the first precharge-level voltage, the first target-level voltage, the second precharge-level voltage, and the second target-level voltage to drive the display panel, wherein the first precharge-level voltage is switched to the first target-level voltage after the first switch time, and the second precharge-level voltage is switched to the second target-level voltage after the second switch time.