Host-Assisted Display Driver Circuit for Deburn-In Compensation
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Solution Overview
Problem
Display devices suffer from image unevenness due to mura and burn-in, which current display driver integrated circuits (DDICs) struggle to accurately compensate for due to limited storage space and processing capability, leading to inconsistent luminance and brightness between pixels.
Innovation Solution
A cooperative deburn-in compensation scheme involving a display driver circuit and host processor, where the host processor accumulates stress values and generates compensation data, which is used by the display driver circuit to accurately compensate image data, leveraging the host processor's larger memory and processing capabilities to overcome the limitations of the DDIC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deburn-in compensation is performed using only the display driver circuit, then the system is simple, but the compensation accuracy is insufficient due to limited storage space and processing capability
Solution Approach 1:
The system is segmented into two functional parts: the host processor handles stress value accumulation and compensation data generation, while the display driver circuit handles compensation execution. This segmentation allows each component to operate within its capability limits while achieving overall high compensation accuracy.
Solution Approach 2:
Compensation data acts as an intermediary between the host processor's stress analysis and the display driver circuit's pixel control. The compensation data transfers stress information from the processor to the driver circuit, enabling accurate compensation without requiring direct complex processing in the driver circuit.
2Productivity
If the display driver circuit stores and processes all compensation data, then processing is fast, but storage space is insufficient
Solution Approach 1:
The host processor extracts and generates compensation data based on accumulated stress values, then transfers this data to the display driver circuit. This extraction moves the storage burden from the limited driver circuit memory to the host processor's larger memory resources.
Solution Approach 2:
The host processor performs preliminary accumulation of stress values and generation of compensation data before the display driver circuit executes the compensation. This preliminary action prepares the compensation data in advance, reducing the real-time processing and storage requirements of the driver circuit.
3Measurement precision
If stress accumulation is performed continuously, then compensation accuracy improves, but processing time increases
Solution Approach 1:
The stress accumulator continuously accumulates stress values in the background without interrupting normal display operations. This continuous accumulation ensures accurate stress measurement while maintaining system productivity, as the accumulation occurs parallel to other processing tasks.
Data Source
AI summary
A display driver circuit includes a receiver, a memory and a compensation circuit. The receiver receives an original image data and a compensation data from a host processor. The memory stores the compensation data. The compensation circuit, coupled to the memory and the receiver, reads out the compensation data from the memory, and compensates the original image data by using the compensation data to generate a first compensated image data.