Selective Preliminary Charging for Electroluminescence Display Panels
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Solution Overview
Problem
Conventional electroluminescence display panels experience a brightness drop due to parasitic capacitance and high power consumption, as the preliminary charging and peak booting stages must be repeated in every parallel driving period.
Innovation Solution
The method involves a data driving unit with a comparator and AND gates that only perform preliminary charging and peak booting stages when there is a difference between present and following parallel driving period data, thereby optimizing charging operations and reducing unnecessary power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If preliminary charging and peak booting stages are repeated in every parallel driving period, then brightness uniformity is maintained, but power consumption increases
Solution Approach 1:
The patent applies preliminary charging to data electrode lines before scanning only when the following scan line requires a different grayscale value than the current scan line. This conditional preliminary action charges lines in advance only when necessary, preventing brightness drops at line boundaries while avoiding unnecessary charging operations that would waste power.
Solution Approach 2:
The patent dynamically adjusts the charging strategy by comparing grayscale values of consecutive scan lines and selectively applying preliminary charging based on this comparison. The system transitions from a static approach (charging every line) to a dynamic approach (charging only when grayscale changes), optimizing both brightness uniformity and power consumption.
2Illumination intensity
If preliminary charging is performed in every parallel driving period, then brightness drop is prevented, but power consumption increases
Solution Approach 1:
The patent uses feedback by comparing the grayscale value of the current scan line with the following scan line to determine whether preliminary charging is needed. This feedback mechanism allows the system to adapt its charging behavior to actual display requirements, preventing brightness drops only when grayscale changes occur and thereby reducing unnecessary power consumption.
Solution Approach 2:
The patent changes the operating parameter of preliminary charging from a constant on-state to a conditional state based on grayscale value comparison. By monitoring and responding to parameter changes in the display data, the system performs preliminary charging only when grayscale values differ between consecutive lines, optimizing both brightness stability and energy efficiency.
3Illumination intensity
If data electrode lines are continuously charged, then brightness uniformity is maintained, but parasitic capacitance effects worsen
Solution Approach 1:
The patent applies preliminary charging to data electrode lines before scanning only when the following scan line requires a different grayscale value than the current scan line. This conditional preliminary action charges lines in advance only when necessary, preventing brightness drops at line boundaries while avoiding unnecessary charging operations that would waste power.
Solution Approach 2:
The patent implements periodic preliminary charging at specific intervals determined by grayscale changes rather than continuously. By spacing charging operations only at necessary points (when grayscale values change), the system maintains brightness uniformity while reducing the cumulative effect of parasitic capacitance that would occur with continuous charging.
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 prevents brightness drops caused by parasitic capacitance and reduces power consumption by ensuring these stages are only executed when necessary, maintaining brightness and efficiency.
Implementation Method 1
The charging voltage determiner 22, which comprises a capacitor 24 and a zener diode 23 connected in parallel, determines a preliminary charging voltage of the data electrode lines 3 by using the zener diode 23 breakdown voltage.
Implementation Method 2
electroluminescence cells are formed in line crossing areas
Data Source
AI summary
Provided is a method for driving an electroluminescence display panel in which data electrode lines and scan electrode lines cross each other with predetermined gaps to form electroluminescence cells in the crossing areas. The method includes performing a preliminary charging stage in which the signal input terminals of the data electrode lines are switched and electrically disconnected from a data driving unit, and the other terminals of the data electrode lines are switched and electrically connected to one another in the initial stage of each parallel driving period. The preliminary charging stage is performed in the following parallel driving period when the data of the present parallel driving period and the data of the following parallel driving period are different.