Dynamic Peak Brightness Control for OLED Display Lifespan
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Solution Overview
Problem
Display devices using OLED technology experience a shorter expected lifetime when frequently displaying bright images, necessitating a method for dynamic peak brightness control to enhance display control without introducing side effects.
Innovation Solution
A method and timing controller for dynamic peak brightness control, which calculates contrast ratio and maximum level quantity of previous images to adjust pixel data, using pixel data mapping and selective pixel data adjustment circuits to generate updated pixel data for display, thereby extending the display module's lifespan without increasing costs significantly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If bright images are frequently displayed on OLED display devices, then the display brightness and visual quality are improved, but the expected lifetime of the display device is shortened
Solution Approach 1:
The patent implements dynamic peak brightness control by calculating the contrast ratio (CR) and maximum level quantity (MLQ) of previous images, then adaptively adjusting pixel data of the current image through pixel data mapping and selective pixel data adjustment. This dynamic adjustment mechanism allows the display brightness to be modulated in real-time based on image content characteristics, preventing excessive brightness that would otherwise shorten OLED lifetime while maintaining visual quality when appropriate.
2Duration of action of stationary object
If dynamic peak brightness control is implemented to protect display lifetime, then display device lifetime is extended, but the display control complexity increases
Solution Approach 1:
The patent segments the brightness control process into distinct functional modules: a brightness distribution estimation circuit that calculates CR and MLQ parameters, a pixel data mapping circuit that applies first gain based on MLQ, and a selective pixel data adjustment circuit that applies second gain based on CR and MLQ. This segmentation allows each module to perform a specific function, simplifying the overall control logic while achieving sophisticated brightness management to protect display lifetime.
Solution Approach 2:
The patent performs preliminary calculation of the contrast ratio (CR) and maximum level quantity (MLQ) based on previous image data before processing the current image. This preliminary action allows the system to pre-determine the appropriate brightness adjustment parameters, enabling efficient real-time control without adding significant computational complexity during the main image processing pipeline.
3Duration of action of stationary object
If pixel data mapping and selective adjustment circuits are added to achieve dynamic brightness control, then display lifetime is protected, but the device cost increases
Solution Approach 1:
The patent designs the brightness distribution estimation circuit, pixel data mapping circuit, and selective pixel data adjustment circuit to perform multiple functions within the timing controller. These circuits not only control peak brightness to protect OLED lifetime but also maintain image quality and can be integrated with existing display control architectures. This multi-functionality reduces the need for separate dedicated hardware components, thereby limiting the increase in device cost while achieving lifetime protection.
Data Source
AI summary
A method for performing dynamic peak brightness control in a display module and an associated timing controller are provided. The method includes: calculating a maximum value and a minimum value of a previous image to determine a contrast ratio (CR) of the previous image; calculating a maximum level quantity (MLQ) of the previous image, wherein the MLQ represents a number of pixels corresponding to the maximum value; performing pixel data mapping on original pixel data of a current image according to a first gain corresponding to the MLQ, to generate intermediate pixel data of the current image; and performing selective pixel data adjustment on the intermediate pixel data according to a second gain corresponding to the CR and the MLQ, to generate updated pixel data of the current image, for being displayed on a display panel of the display module, wherein the updated pixel data replaces the original pixel data.