Display Panel Driving Circuit Impedance Control
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Solution Overview
Problem
Current driving methods for display panels result in abnormal display images due to voltage level fluctuations on unscanned scanning lines, leading to pixels being inadvertently enabled or disabled, affecting display quality and power efficiency.
Innovation Solution
A driving circuit comprising a scanning driving circuit, a data driving circuit, and a control circuit that dynamically adjusts the impedance state of unscanned scanning lines based on the number of pixels to be driven, ensuring stable voltage levels and preventing charge discharge from parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the scanning driving circuit controls unscanned scanning lines to be in high impedance state for power saving, then power consumption is reduced, but voltage levels of unscanned scanning lines become unstable due to coupling effects from discharged pixels
Solution Approach 1:
The patent applies dynamics by making the impedance state of unscanned scanning lines changeable rather than fixed. The scanning driving circuit dynamically switches between high impedance state (for power saving) and low impedance state (for voltage stability) based on the scanning phase. Specifically, during the discharge phase, unscanned scanning lines are switched to low impedance state to prevent voltage fluctuations, while during other phases they remain in high impedance state to save power.
Solution Approach 2:
The patent changes the impedance parameter of unscanned scanning lines from a fixed high impedance state to a variable state that can switch between high and low impedance. This parameter change is controlled by the scanning driving circuit according to the scanning phase, allowing the system to optimize both power consumption and voltage stability by selecting the appropriate impedance level at different times.
2Ease of operation
If sequential scanning of multiple scanning lines is performed without considering the number of driven pixels, then scanning simplicity is maintained, but voltage coupling effects cause pixels to be inadvertently enabled or disabled
Solution Approach 1:
The patent implements feedback by having the scanning driving circuit monitor or receive information about the number of pixels to be driven on each scanning line, and use this information to adjust the impedance state of unscanned scanning lines. This feedback mechanism allows the system to adapt the scanning process to the actual display content, preventing abnormal pixel states while maintaining efficient scanning operation.
Solution Approach 2:
The patent applies preliminary action by pre-adjusting the impedance state of unscanned scanning lines before the discharge phase occurs. The scanning driving circuit proactively switches unscanned scanning lines to low impedance state in advance of potential voltage coupling problems, preventing abnormal pixel states before they occur rather than correcting them afterward.
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 stabilizes voltage levels on unscanned scanning lines, preventing abnormal display images and achieving power savings by maintaining pixels in a disabled state, thereby enhancing display quality and reducing power consumption.
Implementation Method 1
In order to prevent electric charges stored in the parasitic capacitance of pixels on the other scanning lines that are not scanned from discharging for power saving
Implementation Method 2
voltage levels of scanning lines in the high impedance state will be affected by the discharge of the driven pixels, resulting in the voltage levels coupling down
Data Source
AI summary
A driving circuit of a display panel comprises a scanning driving circuit, a data driving circuit, and a control circuit. The scanning driving circuit is coupled to a plurality of scanning lines of the display panel, and scans the scanning lines. The data driving circuit is coupled to a plurality of data lines of the display panel and provides at least one data signal corresponding to each scanning line to at least one data line of the data lines for driving at least one pixel of the display panel. The control circuit is coupled to the scanning driving circuit and the data driving circuit, controls the scanning driving circuit and the data driving circuit, and determines a scanning order of the scanning driving circuit to scan the scanning lines according to a driving number of the pixels to be driven by the data driving circuit corresponding to each scanning line.