Display Backlight Dimming Transition to Reduce Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing backlight adjustment methods in terminal devices cause abrupt changes in screen brightness due to the transition between DC and PWM dimming strategies, leading to flicker and screen refresh rate abnormalities.
Innovation Solution
A method that reduces pulse quantity and adds transition backlight during the transition between DC and PWM dimming strategies, ensuring smooth brightness transitions by adjusting pulse quantities and frame rates to meet high-frequency PWM dimming requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device transitions between DC and PWM dimming strategies to adjust backlight brightness, then the backlight brightness can be adjusted across different ranges, but an abrupt change in screen brightness occurs causing flicker
Solution Approach 1:
The patent introduces a transition backlight value as an intermediary state between DC and PWM dimming strategies. When switching from DC to PWM dimming, the backlight first transitions to this intermediate value before reaching the final target value. This intermediary state acts as a buffer that smooths the transition process, preventing abrupt brightness changes and the resulting flicker, while still enabling the full range of backlight adjustment capabilities.
2Use of energy by moving object
If the terminal device uses PWM dimming strategy with reduced pulse quantity, then power consumption is reduced, but screen refresh rate abnormalities occur
Solution Approach 1:
The patent dynamically adjusts the pulse quantity in PWM signals based on the current backlight value and transition state. During normal PWM operation, the pulse quantity is optimized for power efficiency. However, during transitions and at specific backlight values (such as the transition backlight value), the pulse quantity is dynamically adjusted to maintain proper screen refresh rate. This dynamic adjustment ensures both power consumption optimization and screen refresh rate stability without requiring a fixed pulse quantity.
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 alleviates abrupt brightness changes and reduces screen flicker, maintaining smooth screen transitions and minimizing power consumption by optimizing pulse and frame rate adjustments.
Implementation Method 1
a driving current flowing through an organic light-emitting material is reduced to control light-emitting efficiency
Data Source
AI summary
Embodiments of this application provide a backlight adjustment method and apparatus. The method includes: displaying an nth image frame, where when the nth image frame is displayed, a backlight value of a terminal device is a first backlight value, and a pulse quantity within a unit time in a pulse adjustment PWM signal used by the terminal device for backlight adjustment is a first pulse quantity; and displaying an (n+1)th image frame, where when the (n+1)th image frame is displayed, a backlight value of the terminal device is a second backlight value, and a pulse quantity within a unit time in a PWM signal used by the terminal device for backlight adjustment is a second pulse quantity.