Bistable Display Driver Circuit Fast Discharge Control
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Solution Overview
Problem
Driver circuits for bistable display devices experience instability in picture optical parameters and image display quality due to slow discharging speeds of high-voltage and low-voltage gate control ports and fast discharging of the reference potential port, leading to degraded image quality.
Innovation Solution
A driver circuit for bistable display devices includes a first and second power supply, high-voltage and low-voltage gate control ports, a reference voltage source, and discharging circuits that accelerate electrical discharge when power is stopped, along with a switch to control communication between the reference potential port and voltage source, minimizing adverse effects on image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the high-voltage gate control port and low-voltage gate control port naturally discharge through voltage stabilizing capacitor, then the discharging process is simple, but the discharging speed is relatively slow
Solution Approach 1:
The patent introduces discharging circuits with switching elements that are prepared in advance but activated only when needed (when power is stopped). The switching elements are pre-configured to connect discharging paths to ground, enabling fast discharge without requiring continuous complex circuitry during normal operation.
Solution Approach 2:
The patent makes the discharging circuit dynamic by using switching elements that can change their state based on power supply status. When power is supplied, the switching elements are off, allowing normal operation. When power is stopped, the switching elements turn on to enable fast discharge, adapting the circuit behavior to current needs.
2Speed
If the reference potential port discharges through a switch to ground, then the discharging speed is relatively fast, but the picture optical parameters become unstable and image display quality is degraded
Solution Approach 1:
The patent extracts the reference potential port from the discharging path by introducing a switching element that isolates it. When power is stopped, the switch opens to prevent the reference potential port from discharging, thereby maintaining stable picture optical parameters while allowing other ports to discharge independently.
Solution Approach 2:
The patent segments the discharge paths for different ports by introducing separate switching elements for each. This allows independent control of discharge for the high-voltage gate control port, low-voltage gate control port, and reference potential port, enabling fast discharge for some while preventing discharge for others as needed.
3Use of energy by stationary object
If continuous charging is not needed after updating image, then low power consumption is achieved, but the discharging speed differences cause image display quality degradation
Solution Approach 1:
The patent makes the discharge control dynamic by using switching elements that respond to power supply status. When power is stopped, the switches automatically configure the discharge paths to maintain image display quality, adapting the circuit behavior to the low-power state without requiring continuous charging.
Solution Approach 2:
The patent changes the discharge parameters (speed, path configuration) based on power supply status. When power is supplied, normal operation occurs. When power is stopped, the switching elements change the discharge path configuration to maintain stable picture optical parameters, allowing low power consumption while preserving image quality.
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
The solution improves the stability of picture optical parameters and image display quality by accelerating discharges of the high-voltage and low-voltage gate control ports and isolating the reference potential port, reducing the impact on image quality during discharging.
Implementation Method 1
the high-voltage gate control port and the low-voltage gate control port naturally discharge through respective voltage stabilizing capacitor
Implementation Method 2
the reference potential port discharges the voltage stabilizing capacitor to the ground through a discharging path controlled by a switch
Data Source
AI summary
An exemplary driver circuit for bistable display device includes a plurality of pixel electrodes, a first power supply, a second power supply, a high-voltage gate control port selectively driven by the first power supply, a low-voltage gate control port selectively driven by the second power supply, a reference potential port, a first discharging circuit connecting the high-voltage gate control port to the ground, a second discharging circuit connecting the low-voltage gate control port to the ground, and a switch for deciding whether the reference potential port is electrically connected to a reference voltage source or not.