Display Driver IC Segmentation for AMOLED MURA Correction
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Solution Overview
Problem
Conventional display driver ICs for AMOLED panels require high-spec ICs to process all image quality distortion data at once, leading to increased manufacturing costs, heat generation, and reduced operation speed due to complex operations.
Innovation Solution
A display driver IC that classifies image quality distortion factors affecting each pixel and compensates for them by obtaining compensation data in specific gamma curve domains between luminance and video data, and between luminance and driving voltage, and then adding them together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional driving circuits process all image quality distortion data at once using high-spec ICs, then compensation accuracy is improved, but manufacturing cost increases and heat generation occurs
Solution Approach 1:
The patent segments the image quality distortion compensation into multiple processing stages: first compensating for TFT threshold voltage deviation, then compensating for OLED luminous efficiency deviation, and finally compensating for gamma curve distortion. Each stage processes specific distortion factors separately rather than all at once, reducing the computational burden on the IC while maintaining comprehensive compensation accuracy.
2Measurement precision
If conventional driving circuits process all image quality distortion data at once, then compensation completeness is improved, but operation speed decreases due to complex operations
Solution Approach 1:
The patent performs preliminary compensation for TFT threshold voltage deviation before OLED driving, and preliminary measurement and storage of OLED luminous efficiency characteristics during manufacturing. This preliminary action reduces the real-time computational requirements during actual display operation, improving operation speed while maintaining compensation completeness.
3Measurement precision
If high-spec ICs are used to process all distortion data simultaneously, then compensation accuracy is improved, but heat generation increases
Solution Approach 1:
The compensation process is divided into distinct segments that can be executed sequentially with lower computational intensity at each stage. The TFT compensation segment, OLED compensation segment, and gamma correction segment are processed separately, reducing peak computational load and associated heat generation compared to simultaneous processing of all distortion factors.
4Measurement precision
If complex operations are performed to compensate for all distortion factors, then compensation comprehensiveness is improved, but circuit area increases
Solution Approach 1:
The compensation circuit is segmented into functional modules: TFT threshold voltage compensation module, OLED luminous efficiency compensation module, and gamma curve correction module. Each module handles specific compensation tasks independently, allowing for optimized resource allocation and reduced overall circuit area compared to a monolithic complex processing unit.
Data Source
AI summary
The present invention relates to a display driver IC for AMOLED image correction optimized for external compensation to solve problems such as MURA and image sticking of an AMOLED panel, and more specifically, to a display driver IC for AMOLED image correction, which comprises a first compensation circuit section, a conversion circuit section, a second compensation circuit section, and a driving circuit section, and obtains compensation data for luminous efficiency deviation rate (ΔLU) of a light-emitting diode and beta value deviation rate (ΔBeta) of a thin film transistor in a gamma curve domain between luminance and video data, and compensates for threshold voltage deviation rate (ΔVT) of a thin film transistor by obtaining compensation data in a gamma curve domain between luminance and driving voltage and then adding them up.