Display Driver IC Luminance Correction via On-Pixel-Ratio Summation
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Solution Overview
Problem
Display devices, such as OLED displays, face challenges in maintaining luminance uniformity across different display areas, leading to inefficiencies in power consumption and image quality due to the lack of effective methods for automatically controlling current and adjusting luminance.
Innovation Solution
The implementation of a primary and secondary driver IC system that calculates and applies a common luminance correction factor based on the On-Pixel-Ratio (OPR) of multiple display areas, synchronizing the adjustment of image data signals to ensure uniform luminance across the entire display panel, thereby optimizing power usage and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If each driver IC independently performs ACL operation for its corresponding display area, then power consumption is reduced, but luminance uniformity across the entire display panel deteriorates
Solution Approach 1:
The patent merges the ACL operations of multiple driver ICs by having them share a common luminance correction factor. The primary driver IC calculates the total OPR by summing OPRs from all driver ICs and determines a unified luminance correction factor that is applied by all driver ICs, ensuring consistent luminance across the entire display panel while maintaining power consumption benefits.
Solution Approach 2:
The luminance correction factor serves as a universal parameter that is shared across all driver ICs. Instead of each driver IC operating independently with its own correction factor, the system uses a single luminance correction factor that universally applies to all display areas, ensuring uniform luminance while allowing each driver IC to maintain its ACL function.
2Illumination intensity
If a common luminance correction factor is applied across all display areas, then luminance uniformity is improved, but device complexity increases due to communication requirements between driver ICs
Solution Approach 1:
The patent segments the calculation responsibility by designating one driver IC as the primary driver IC that performs the total OPR calculation and luminance correction factor determination. Other driver ICs only need to provide their individual OPR values and receive the correction factor, dividing the complexity into manageable parts rather than requiring full inter-IC communication for all calculations.
Solution Approach 2:
The primary driver IC acts as an intermediary that centralizes the complex calculation functions. Instead of requiring direct communication and coordination between all driver ICs, the primary driver IC receives OPR information from others, performs the total OPR calculation, determines the luminance correction factor, and distributes it to all driver ICs, simplifying the overall communication structure.
Data Source
AI summary
A display device includes a display panel including a first display area and a second display area, a primary driver integrated circuit (IC) to receive first input image of the first display area, to determine a luminance correction factor based on a sum of a first On-Pixel-Ratio (OPR) of the first display area and a second OPR of the second display area, to output a first image data signal to which the first input image data is remapped using the luminance correction factor, a secondary driver IC to receive second input image data of the second display area, to calculate the second OPR, to provide the second OPR to the primary driver IC, and to output a second image data signal to which the second input image data is remapped using the luminance correction factor, and a scan driver.