Display Driving Controller With Multi-Frame Grayscale Overdrive
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Solution Overview
Problem
Conventional display devices experience blur and color drag due to the gradual change in actual luminance when grayscale values of frame data are changed, as they rely on overdriving only in the first frame, which does not adequately address the time required for the display panel to reach target luminance.
Innovation Solution
A driving controller that includes a data converter and data compensator to overdrive grayscale values across multiple frames, utilizing temperature and luminance conditions to adjust grayscale values based on previous frames, thereby preventing blur and color drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If overdriving is applied only in the first frame, then the grayscale value changes quickly, but the actual luminance cannot reach target luminance in time causing blur and color drag
Solution Approach 1:
The patent applies overdriving not only in the first frame but also in subsequent frames (N-th frame where N≥2) when the grayscale value of the current frame differs from the previous frame. This preliminary action ensures the luminance reaches target level before image display, preventing blur and color drag by proactively adjusting grayscale values across multiple frames until target luminance is achieved.
2Loss of time
If grayscale value is overdriven in multiple frames, then target luminance is reached faster, but the complexity of grayscale value conversion increases
Solution Approach 1:
The patent implements a feedback mechanism where the driving controller continuously compares the grayscale value of the current frame with the previous frame, and also monitors whether the luminance has reached the target level. Based on this feedback, the controller dynamically adjusts whether to apply overdriving in each subsequent frame, optimizing the balance between speed and complexity by stopping overdriving once target luminance is achieved.
Data Source
AI summary
A driving controller including: a data converter configured to convert an X grayscale value of N-th frame data into a Y grayscale value of the N-th frame data; a frame memory configured to receive the Y grayscale value of the N-th frame data from the data convertor and output a Y grayscale value of N−1-th frame data to the data converter; and a data compensator configured to compensate the X grayscale value of the N-th frame data based on the X grayscale value of the N-th frame data and the Y grayscale value of the N−1-th frame data, wherein N is a natural number greater than or equal to 2.