LCD Backlight Current Control for Longer Local Dimming Lifespan
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Solution Overview
Problem
The lifespan of LCD screens is reduced due to the local dimming method causing the backlight to operate at excessively high currents for extended periods, leading to hardware damage.
Innovation Solution
An image adjustment method that determines an operating current value based on the relationship between a maximum current setting value and an expected current value, using overdrive time and frequency to control backlight brightness, thereby preventing prolonged high-current operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming method directly controls backlight brightness according to expected current value, then display performance is improved, but backlight works at excessively high current for long time causing hardware damage and shortened lifespan
Solution Approach 1:
The patent implements a feedback mechanism by monitoring the actual current value of the backlight and comparing it with the maximum current setting value. The system dynamically adjusts the backlight brightness based on this feedback, preventing the backlight from operating at excessively high currents for extended periods, thus resolving the contradiction between display performance and device lifespan
Solution Approach 2:
The patent introduces dynamic current adjustment by determining overdrive time when actual current exceeds maximum current setting value, and dynamically selecting operating current values based on preset time thresholds. This dynamic control prevents sustained high-current operation while maintaining display performance when needed, addressing the contradiction between illumination intensity and reliability
2Productivity
If backlight operates at high current to achieve expected brightness, then display performance is improved, but hardware damage occurs and lifespan is reduced
Solution Approach 1:
The patent changes the operating parameters of the backlight by introducing overdrive time monitoring and dynamic current value selection. When the actual current exceeds the maximum current setting value, the system determines the overdrive time and selects appropriate operating current values based on preset time thresholds, thereby preventing hardware damage from excessive current while maintaining display performance
Solution Approach 2:
The patent implements periodic monitoring and adjustment of backlight current by continuously comparing actual current with maximum current setting value, determining overdrive time, and dynamically adjusting operating current based on time thresholds. This periodic control prevents sustained harmful high-current operation while allowing performance-oriented high current when necessary
Data Source
AI summary
An image adjustment method, a device, an electronic device, and a computer-readable storage medium are provided. A maximum current setting value and an expected current value corresponding to a backlight are acquired. According to the maximum current setting value and the expected current value, an operating current value corresponding to the backlight is determined. According to the operating current value, a maximum overdrive current setting value corresponding to the backlight, and a current brightness array of the backlight corresponding to a current displayed image on a screen, a target brightness array of the backlight is determined. A brightness of the backlight is controlled according to multiple target brightness arrays in the target brightness array to adjust an image displayed on the screen. A display lifespan of the screen is improved.