Display Driving Circuit Power Switching for Discharge Reliability
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Solution Overview
Problem
Display driving circuits face issues with DC residual effects and image sticking due to improper power supply, leading to inadequate discharge of display panels.
Innovation Solution
A display driving circuit comprising a level shift circuit, power switching circuit, and switch control circuit that selectively changes the source power based on voltage levels to ensure proper discharging, preventing DC residual effects and image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display driving circuit grounds the source output to discharge the display panel in OFF mode, then the display panel should be discharged, but improper power supply prevents proper discharging causing DC residual effect and image sticking
Solution Approach 1:
The patent applies dynamics by making the power supply to the level shift device changeable based on operating conditions. The power switching circuit dynamically selects between first power (normal operation) and second power (discharge mode), allowing the system to adapt its power supply characteristics to achieve reliable discharging even when external power is improper.
Solution Approach 2:
The patent changes the power parameter supplied to the level shift device. By switching between different power sources with different voltage characteristics (first power during normal operation, second power during discharge), the system modifies the electrical parameters to ensure proper discharging function under various power supply conditions.
2Device complexity
If a simple grounding method is used to discharge the display panel, then the circuit complexity is low, but the discharge function fails under improper power supply conditions
Solution Approach 1:
The patent introduces an intermediary power switching circuit between the power source and the level shift device. This intermediary component mediates the power delivery, selecting appropriate power sources based on operating mode, thereby ensuring the discharge function works reliably without requiring complete redesign of the grounding mechanism.
Solution Approach 2:
The patent segments the power supply function into multiple independent power sources (first power and second power) that can be selectively activated. The power switching circuit divides the power delivery task, routing different power sources to the level shift device depending on whether the system is in normal operation or discharge mode.
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 DC residual effects and image sticking by ensuring proper discharging of display panels even under improper power supply conditions, enhancing the reliability of display devices.
Implementation Method 1
a level shift device configured to receive a source power applied thereto, and configured to generate an output signal by amplifying an input signal
Implementation Method 2
a pull-down transistor configured to be gated by the output signal of the level shift device, and to selectively connect an output terminal of the operational amplifier to a ground terminal
Data Source
AI summary
A display driving circuit comprising a level shift circuit, the level shift circuit including a level shift device configured to receive a source power applied thereto, and to generate an output signal by amplifying an input signal; a power switching circuit configured to provide any one of first to third selection powers as the source power to the level shift device, the first to third selection powers being different from one another; and a switch control circuit configured to change the first selection power to the second or third selection power based on a change of voltage levels of the first to third selection powers.