Display Panel Discharge Circuit for Stable Power-Off Control
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Solution Overview
Problem
Display devices with unstable power supply voltage can malfunction due to erroneous detection of discharge conditions, leading to undesirable damage to pixel circuits during power-on, as existing discharge control circuits may initiate discharge prematurely.
Innovation Solution
A discharge control circuit comprising a flip-flop that generates a representation of the power supply voltage, converting rising and falling edges to steeper edges or canceling them, and a level shifter that initiates discharge only upon satisfying the discharge condition during shutdown, preventing erroneous discharges during power-on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge control circuit monitors power supply voltage to eliminate shutdown artifacts, then shutdown artifacts are eliminated, but the circuit may malfunction and damage pixel circuits when power supply voltage is unstable during power-on
Solution Approach 1:
The patent introduces an intermediary component (discharge control circuit with improved design) between the power supply voltage monitoring and the pixel array discharge control. This intermediary includes additional control logic that distinguishes between power-on and power-off states, preventing erroneous discharge commands during power-on while maintaining artifact elimination during power-off.
Solution Approach 2:
The discharge control circuit incorporates feedback mechanisms that continuously monitor power supply voltage characteristics and adjust discharge control decisions accordingly. By analyzing voltage transition patterns and states, the circuit determines whether to enable or disable discharge functions, preventing damage during power-on while maintaining artifact elimination during normal shutdown.
2Measurement precision
If the discharge control circuit initiates discharge when discharge condition is satisfied, then shutdown artifacts are eliminated, but erroneous detection during power-on causes premature discharge
Solution Approach 1:
The discharge control circuit employs dynamic control strategies that adapt its detection thresholds and decision logic based on the operational state. During power-on, the circuit dynamically disables or modifies discharge conditions to prevent premature discharge, while during normal operation and shutdown, it restores full discharge functionality for artifact elimination.
Solution Approach 2:
The circuit performs preliminary assessment of power supply voltage characteristics before enabling discharge functions. By detecting whether the system is in power-on or power-off state before initiating discharge, the circuit prevents erroneous discharge commands during power-on while maintaining proper discharge control during shutdown.
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 effectively prevents premature discharge during power-on and ensures timely discharge during shutdown, thereby protecting pixel circuits and eliminating shutdown artifacts in display devices with unstable power supply voltages.
Implementation Method 1
the flip-flop is configured to generate the representation of the power supply voltage by converting a rising edge of the power supply voltage into a steeper rising edge in the representation of the power supply voltage or canceling the rising edge of the power supply voltage in the representation of the power supply voltage
Implementation Method 2
the flip-flop comprises a Schmitt trigger configured such that the rising edge of the power supply voltage is converted into the steeper rising edge in the representation of the power supply voltage and a falling edge of the power supply voltage is converted into a steeper falling edge in the representation of the power supply voltage
Implementation Method 3
a level shifter configured to level-shift timing signals for controlling operation of the pixel array, to provide the level-shifted timing signals to the display panel
Implementation Method 4
the discharge control circuit monitors a change in the power supply voltage when the display device is being shut down and initiates discharge of the pixel array in the display device when a discharge condition is satisfied by, for example, turning on the switching thin-film transistors (TFTs) in individual pixel circuits. This allows the charges stored in the pixel circuits to be discharged
Data Source
AI summary
A discharge control circuit for a display panel includes a flip-flop configured to generate a representation of a power supply voltage of the display panel based on the power supply voltage, the representation of the power supply voltage enabling a discharge condition under which a pixel array of the display panel is discharged to be not satisfied upon power-on or during operation of the display panel and to be satisfied upon shutdown of the display panel; and a level shifter configured to level-shift timing signals for controlling operation of the pixel array, to provide the level-shifted timing signals to the display panel, and to initiate discharge of the pixel array in response to the discharge condition being satisfied.