Display Panel LED Driving With Parasitic Capacitance Compensation
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Solution Overview
Problem
LED display screens suffer from white balance color shift due to parasitic capacitance, especially when displaying images with low grayscale values, leading to a poor display effect.
Innovation Solution
A driving method for a display panel that adjusts the driving-current values for different types of LEDs to account for parasitic capacitance by providing currents with adjusted values that differ from target values, allowing the current to reach the target driving-current values more quickly, thereby reducing the influence of parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If target driving-current values are directly provided to LEDs, then the control is simple, but white balance color shift occurs due to parasitic capacitance
Solution Approach 1:
The patent applies preliminary action by providing an adjusted driving current before the target driving current to compensate for parasitic capacitance effects. The driving current is adjusted based on the grayscale value, with lower grayscale values receiving higher adjusted currents to overcome the capacitance barrier and achieve accurate color display.
Solution Approach 2:
The patent changes the driving current parameter dynamically based on grayscale values. Different adjusted driving current values are applied according to different grayscale levels, allowing the system to adapt to the parasitic capacitance effects at various brightness levels and maintain color accuracy.
2Reliability
If adjusted driving-current values are provided to compensate for parasitic capacitance, then white balance color shift is reduced, but the driving method becomes more complex
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the driving current based on grayscale values. The adjusted driving current is calculated as a function of the target current and grayscale level, creating a compensation mechanism that maintains color accuracy without requiring complex hardware modifications.
Solution Approach 2:
The patent uses feedback by determining adjusted driving current values based on the relationship between target currents and grayscale values. The system monitors the display requirements and adjusts the driving current accordingly, creating a closed-loop control that compensates for parasitic capacitance effects.
3Reliability
If higher currents are provided to overcome parasitic capacitance, then color accuracy improves, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the driving current based on grayscale values. Higher adjusted currents are applied only when necessary (at lower grayscale values where parasitic capacitance effects are most pronounced), while higher grayscale values use currents closer to the target, optimizing energy consumption.
Solution Approach 2:
The patent uses partial action by applying excessive current compensation only at specific grayscale levels where it is most needed. The adjusted driving current exceeds the target current primarily at lower grayscale values, while at higher grayscale values the adjustment is minimal, avoiding unnecessary energy consumption.
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 method effectively reduces white balance color shift by prolonging the conduction time of LEDs and utilizing the adjusted currents to consume parasitic capacitance, ensuring consistent light emission across different grayscale values.
Implementation Method 1
an LED is affected by parasitic capacitance, and a phenomenon of white balance color shift occurs
Data Source
AI summary
A driving method for a display panel and a display device are provided. The display panel includes multiple types of Light-Emitting Diodes (LEDs). Different types of LEDs have different light-emitting colors. The driving method for the display panel includes the following. Target driving-current values corresponding to the multiple types of LEDs are obtained. Each type of LED corresponds to a target driving-current value. Each type of LED corresponds to an adjusted driving-current value. For each type of LED, the adjusted driving-current value corresponding to the type of LED is different from the target driving-current value corresponding to the type of LED. Currents having corresponding target driving-current values are provided for the multiple types of LEDs respectively.