Display Panel Pixel Reset Circuit for Afterglow Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display panels using light-emitting elements such as LEDs experience flicker phenomena and difficulty in accurately implementing black gradation due to charges remaining in the LEDs after driving, leading to afterglow issues.
Innovation Solution
Incorporating a reset circuit with multiple transistors connected between the light-emitting elements and ground voltage to discharge residual charges during a reset period within the frame period, ensuring no blanking time occurs between frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a light-emitting element is driven continuously to maintain display operation, then the display can show continuous images, but charges remain in the LED causing afterglow and flicker phenomena
Solution Approach 1:
The patent applies preliminary action by introducing a reset period before the sub-frame periods where residual charges are discharged in advance. This reset operation prepares the light-emitting element for the next driving cycle by removing accumulated charges that would otherwise cause afterglow and flicker, enabling continuous operation without these harmful effects.
2Object-generated harmful factors
If a reset period is introduced to discharge residual charges, then afterglow is removed, but the frame period structure becomes more complex
Solution Approach 1:
The patent merges the reset operation with the existing frame period structure by integrating the reset period as an inherent part of the driving cycle. Rather than adding a separate complex reset mechanism, the reset period is combined with the sub-frame periods to form a unified frame period structure, simplifying the overall system while achieving afterglow removal.
3Productivity
If multiple transistors are added to the pixel circuit for charge discharge, then charge removal efficiency is improved, but the pixel circuit complexity increases
Solution Approach 1:
The patent segments the charge discharge function into multiple transistor components within the pixel circuit. By dividing the discharge path into separate transistor stages, each transistor can be optimized for specific functions (such as rapid discharge or controlled release), improving overall charge removal efficiency while maintaining manageable circuit complexity through functional segmentation.
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 effectively removes afterglow and improves flicker issues, enabling accurate black gradation and enhanced image quality by discharging residual charges, particularly in micro LED display panels.
Implementation Method 1
the at least one transistor may be configured to be turned on during the reset period and discharge the charges remaining in the light-emitting element to the ground voltage
Data Source
AI summary
A display panel includes a plurality of pixels provided in a matrix, each pixel including a plurality of sub-pixels. Each pixel of the plurality of sub-pixels includes a light-emitting element, and a pixel circuit that provides a driving current to the light-emitting element in each sub-frame period of a plurality of sub-frame periods within a frame period. The pixel circuit includes a reset circuit that removes charges remaining in the light-emitting element during a reset period within the frame period other than the plurality of sub-frame periods.