Luminance Compensation Circuit for OLED Frame Rate Scaling
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Solution Overview
Problem
Existing OLED display panel technologies face issues with increased cost and switching time due to the need to store multiple Demura compensation factors for different frame rates, leading to inefficient use of flash and RAM storage and poor user experience.
Innovation Solution
A luminance compensation method that acquires a reference compensation factor from flash and stores it in RAM, then multiplies it by a scale factor to generate a target compensation factor for the current frame rate, allowing seamless switching between frame rates without reloading data, thus reducing storage needs and switching time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two sets of Demura compensation factors are stored in flash for different frame rates, then the display panel can support multiple frame rates, but the flash storage space is doubled and cost increases
Solution Approach 1:
The patent extracts only the necessary reference compensation factor data from the flash storage, loading it into RAM when needed, rather than storing all frame rate compensation factors in flash. This reduces flash storage requirements while maintaining multi-frame-rate capability.
Solution Approach 2:
The patent creates a universal reference compensation factor that can be scaled to work across multiple frame rates (60Hz, 90Hz, 120Hz) through a single set of data in flash, making the flash storage serve multiple frame rate requirements simultaneously.
2Adaptability or versatility
If two sets of Demura compensation factors are stored in RAM for different frame rates, then the display panel can switch between frame rates, but the RAM size and DDIC cost are doubled
Solution Approach 1:
The patent extracts only the essential reference compensation factor from flash storage and loads it into RAM, eliminating the need to store multiple frame rate-specific compensation factors in RAM. This reduces RAM size requirements while maintaining frame rate switching capability through scaling operations.
3Measurement precision
If Demura compensation factor is reloaded during frame rate switching, then the compensation can be accurate for the new frame rate, but the switching time is long and screen must be turned off
Solution Approach 1:
The patent performs preliminary scaling of the reference compensation factor based on the target frame rate before actual frame rate switching occurs. By pre-calculating the scaled compensation factor and having it ready in RAM, the system eliminates the need to reload data from flash during switching, enabling seamless transitions without screen off.
Solution Approach 2:
The patent implements dynamic scaling of the compensation factor based on the current frame rate requirements, allowing the system to adapt the single reference compensation factor to different frame rates in real-time through mathematical scaling rather than static pre-stored values.
Data Source
AI summary
The present disclosure discloses a luminance compensation method, a luminance compensation circuit and a display device. When a display panel starts displaying, reference compensation factors are acquired from a flash. Then the acquired reference compensation factors are stored in and RAM. Finally, a scale factor corresponding to the current to-be-displayed frame image is acquired, and the reference compensation factors corresponding to all sub-pixels and stored in the RAM are multiplied by the scale factor to generate a target compensation factor corresponding to the current to-be-displayed frame image, to enable the display panel to perform the displaying according to the target compensation factor.