AMOLED Pixel Circuit Drive Charge Adjustment for Afterimage Reduction
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Solution Overview
Problem
Active Matrix OLED (AMOLED) display screens experience temporary afterimages due to accumulated charges in the pixel circuit, affecting user experience, as the drive charge amount exceeds the required level, leading to increased brightness and hysteresis effects.
Innovation Solution
A display control method that determines a drive charge amount and a threshold for charge amount determination in the pixel circuit, adjusting the drive charge amount when it is less than the threshold to prevent accumulated charge buildup, thereby reducing hysteresis effects and improving visual experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the drive charge amount is increased to ensure sufficient driving capability for the pixel circuit, then the display brightness is improved, but accumulated charges build up in the pixel circuit causing temporary afterimages and hysteresis effects
Solution Approach 1:
The patent applies dynamics by making the drive charge amount adjustable rather than fixed. The driving circuit dynamically adjusts the drive charge amount based on the accumulated charge level in the pixel circuit. When accumulated charges are detected, the drive charge amount is reduced to prevent further buildup; when accumulated charges are low, the drive charge amount is increased to ensure sufficient brightness. This dynamic adjustment resolves the contradiction between maintaining high brightness and preventing afterimage formation.
Solution Approach 2:
The patent implements feedback by monitoring the accumulated charge amount in the pixel circuit and using this information to adjust the drive charge amount. The driving circuit receives feedback about the charge state and automatically modifies the drive charge accordingly. This closed-loop control system ensures that the drive charge is optimized in real-time to prevent afterimages while maintaining display brightness, directly resolving the technical contradiction.
2Object-generated harmful factors
If the drive charge amount is decreased to reduce accumulated charge buildup, then temporary afterimages are reduced, but display brightness and driving capability are insufficient
Solution Approach 1:
The patent applies dynamics by making the drive charge amount adjustable rather than fixed. The driving circuit dynamically adjusts the drive charge amount based on the accumulated charge level in the pixel circuit. When accumulated charges are detected, the drive charge amount is reduced to prevent further buildup; when accumulated charges are low, the drive charge amount is increased to ensure sufficient brightness. This dynamic adjustment resolves the contradiction between maintaining high brightness and preventing afterimage formation.
Solution Approach 2:
The patent implements feedback by monitoring the accumulated charge amount in the pixel circuit and using this information to adjust the drive charge amount. The driving circuit receives feedback about the charge state and automatically modifies the drive charge accordingly. This closed-loop control system ensures that the drive charge is optimized in real-time to prevent afterimages while maintaining display brightness, directly resolving the technical contradiction.
3Device complexity
If a fixed drive charge amount is used to simplify the control circuit, then device complexity is reduced, but accumulated charges cannot be effectively managed leading to afterimages
Solution Approach 1:
The patent applies self-service by enabling the pixel circuit to monitor its own accumulated charge state and automatically adjust its drive charge amount without external intervention. The pixel circuit includes a detection unit that monitors accumulated charges and a control unit that adjusts the drive charge accordingly. This self-regulating mechanism improves charge management accuracy while adding minimal complexity, as the adjustment is performed autonomously within the pixel circuit itself.
Solution Approach 2:
The patent implements feedback by monitoring the accumulated charge amount in the pixel circuit and using this information to adjust the drive charge amount. The driving circuit receives feedback about the charge state and automatically modifies the drive charge accordingly. This closed-loop control system ensures that the drive charge is optimized in real-time to prevent afterimages while maintaining display brightness, directly resolving the technical contradiction.
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 adjusts the drive charge amount to prevent temporary afterimages, enhancing user visual experience by managing accumulated charges and maintaining optimal display brightness.
Implementation Method 1
OLED is a current-mode organic light-emitting device, which causes an occurrence of light-emitting phenomenon through injection and recombination of current carriers. A light-emitting intensity is proportional to a magnitude of an injected current.
Data Source
AI summary
A display control method includes: determining a drive charge amount for driving display of a current pixel, and a threshold for charge amount determination for the pixel circuit, wherein the threshold for charge amount determination is configured to trigger start of determining an accumulated charge amount in the pixel circuit; and in response to the drive charge amount being less than the threshold for charge amount determination, adjusting the drive charge amount for driving the display of the current pixel.