Display Driving Controller With Dynamic Gain for Black-Frame Luminance
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Solution Overview
Problem
Images displayed on electronic devices can vary in perceived luminance due to differences in grayscale between consecutive frames, leading to afterimages and inconsistent display quality.
Innovation Solution
A driving controller with a memory, counter circuit, gain calculator, and compensation unit that adjusts the gain based on the count of consecutive black frames to compensate for luminance differences, using dynamic capacitance compensation to improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dynamic capacitance compensation is applied without gain adjustment, then display response speed is improved, but luminance consistency deteriorates when transitioning from black frames
Solution Approach 1:
The patent applies dynamics by making the gain value variable rather than fixed. The gain calculator dynamically adjusts the gain based on the count value, which represents the number of consecutive black frames. When transitioning from black frames, a higher gain is applied to compensate for luminance overshoot, while maintaining normal response speed during stable conditions.
Solution Approach 2:
The patent changes the parameter of gain value based on the count value. The gain calculator outputs different gain values corresponding to different count values, allowing the system to adapt the compensation strength according to the specific display condition. This parameter change enables simultaneous optimization of response speed and luminance consistency.
2Stability of the object's composition
If gain is increased to compensate for luminance overshoot, then luminance consistency is improved, but display quality deteriorates during normal operation
Solution Approach 1:
The patent applies local quality by providing different gain values for different display conditions. Instead of applying a uniform gain throughout, the system locally adjusts the gain based on the count value, which reflects the specific context of black frame transitions versus normal operation. This ensures high luminance consistency where needed while maintaining normal display quality elsewhere.
Solution Approach 2:
The patent uses feedback through the count value, which is calculated based on the previous frame's grayscale information. The gain calculator receives the count value and outputs an appropriate gain, creating a closed-loop feedback system that continuously adapts to display conditions to maintain both luminance consistency and display quality.
3Device complexity
If static gain value is used, then device complexity is reduced, but adaptability to different display conditions deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining the relationship between count values and gain values. The gain calculator is designed to automatically select appropriate gain values based on the count value without requiring complex real-time calculations. This preliminary preparation allows the system to adapt to different display conditions while keeping the controller complexity manageable.
Data Source
AI summary
Disclosed is a driving controller of an electronic device including a memory that stores the input image signal and outputs a previous image signal, a counter circuit that counts up a count value when the previous image signal corresponds to a black grayscale, and outputs a count value, a gain calculator that outputs a gain in response to the count value, and a compensation unit that outputs an image data signal based on the input image signal and the gain when the previous image signal corresponds to the black grayscale.