Pixel Driving Circuit with Independent Timing for Low-Gray Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Micro LED display panels experience flickering during low-grayscale display due to a small driving current within one frame, which is exacerbated by the series arrangement of duration and current control modules affecting output current.
Innovation Solution
A pixel driving circuit with a current control module, duration control module, and output module, where the duration control module includes a capacitor and transistors to regulate the conduction time of the output module, independent of the duration control module, using voltage control signals to manage the lighting control signal's voltage ranges, thereby maintaining consistent driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the duration control module and current control module are arranged in series, then the circuit structure is simplified, but the output current becomes unstable and causes flickering at low gray levels
Solution Approach 1:
The patent divides the control system into two independent parallel modules: a duration control module that controls the conduction time of the output module, and a current control module that independently regulates the driving current. This segmentation allows each module to perform its function without interfering with the other, resolving the contradiction between simplified structure and stable current output.
Solution Approach 2:
The patent introduces an output module as an intermediary component between the control modules and the light emitting diode. The output module acts as a mediator that receives control signals from both the duration control module and current control module, allowing independent control of conduction time and current magnitude while maintaining a relatively simple overall circuit structure.
2Use of energy by moving object
If the driving current is reduced for low-grayscale display, then the power consumption is lowered, but the display produces flickering
Solution Approach 1:
The patent implements dynamic control of both the conduction time and driving current through separate control modules. The duration control module dynamically adjusts the conduction time of the output module, while the current control module dynamically regulates the driving current magnitude. This dynamic control allows the system to maintain stable display output at low gray levels by optimizing both time and current parameters independently, preventing flickering while managing power consumption.
Solution Approach 2:
The patent changes multiple parameters independently to solve the flickering problem: it separately controls the conduction time parameter through the duration control module and the current magnitude parameter through the current control module. By independently adjusting these parameters, the system can maintain stable display performance at low gray levels without the flickering that occurs when only current is reduced.
3Device complexity
If the duration control module directly controls the current control module, then the control circuit is simplified, but the driving current varies during conduction causing flickering
Solution Approach 1:
The patent segments the control functions into two independent modules: a duration control module that exclusively controls conduction time, and a current control module that exclusively controls driving current magnitude. This segmentation eliminates the interference and current variation problems that occur when one module directly controls the other, while maintaining a relatively simple overall control circuit structure through their parallel independent operation.
Solution Approach 2:
The output module serves as an intermediary that receives independent control signals from both the duration control module and current control module. This intermediary structure allows the patent to maintain a simple control circuit while ensuring consistent driving current, as the current control module can independently regulate current without being affected by the duration control module's timing signals.
Data Source
AI summary
This application proposes a pixel driving circuit and a display panel including an output module, a current control module, and a duration control module. The duration control module includes a first input unit and a first capacitor connected to each other. A second plate of the first capacitor is connected to a voltage control signal terminal. The voltage control signal terminal outputs a periodic lighting control signal during a light emitting stage. When the voltage control signal terminal is configured in a first voltage range, the output module is turned on, and when it is configured in a second voltage range, the output module is turned off.