Display Driver Precharge Circuitry Ground Transition
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Solution Overview
Problem
Display driver circuitry in electronic displays consumes substantial power due to repeated transitions between positive and negative voltage periods, leading to inefficient charge distribution and potential visual artifacts like flicker.
Innovation Solution
The implementation of precharging the timing signals to ground between periods of positive and negative voltage in display driver circuitry reduces power consumption by approximately half and allows for slew rate control, minimizing visual artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If timing signals switch directly between positive voltage and negative voltage, then the display driver can generate timing signals, but power consumption increases substantially
Solution Approach 1:
The patent applies preliminary action by precharging the timing signal to ground voltage before transitioning to positive voltage. This preparatory step reduces the charge that must be supplied during the voltage transition, thereby reducing power consumption while maintaining reliable timing signal generation. The precharge phase is performed in advance of the actual voltage transition to minimize energy expenditure.
2Speed
If the slew rate of gate clock signals is increased, then the timing response is faster, but visual artifacts like flicker occur more frequently and severely
Solution Approach 1:
The patent applies preliminary action by precharging the timing signal to ground before the positive voltage transition. This preliminary step reduces the voltage differential that must be traversed during the active transition, thereby controlling the slew rate to reduce visual artifacts while maintaining adequate timing response. The precharge occurs in advance to prepare the signal for a smoother transition.
Solution Approach 2:
The patent introduces ground voltage as an intermediary state between positive and negative voltage transitions. This intermediary precharge level acts as a buffer that reduces the stress on the timing signal transitions, thereby reducing visual artifacts like flicker while maintaining acceptable timing speed. The ground precharge serves as a intermediate step that mediates between the conflicting requirements of speed and artifact reduction.
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 significantly reduces power consumption and enhances display performance by controlling the slew rate of timing signals, thereby improving the efficiency and reducing visual artifacts in electronic displays.
Implementation Method 1
the amount of charge supplied by positive voltage supplies and negative voltage supplies may be reduced by precharging the timing signals to ground between periods of positive and negative voltage
Data Source
AI summary
Systems and methods for efficiently generating display driver timing signals are provided. In one example, display driver circuitry of an electronic display may provide a negative voltage from a negative voltage supply to display control circuitry during a first period and may provide a positive voltage from a positive voltage supply to the display control circuitry during a second period. After providing the negative voltage during the first period but before providing the positive voltage during the second period, the display driver circuitry may precharge the capacitance of the display control circuitry to ground. In this way, the positive voltage supply substantially does not supply charge to raise the voltage on the capacitance of the display control circuitry from the negative voltage to ground.