LCD Driver Gamma Curve Segmentation for Motion Blur
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Solution Overview
Problem
Liquid crystal display (LCD) devices exhibit poor quality in displaying moving pictures due to slow liquid crystal response speed, leading to motion blur, and existing methods like black-picture insertion result in data loss and reduced brightness.
Innovation Solution
A display device and method that utilize a display panel with a driver providing frame data using multiple gamma curves, where a first sub-frame uses a normal gamma curve and subsequent sub-frames use gamma curves with higher values, reducing motion blur and improving brightness by distributing data effectively within a frame cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black picture is periodically inserted to intercept light emitted from pixels, then motion blur is suppressed, but data loss occurs at white or black gray scale levels and brightness is reduced
Solution Approach 1:
The frame is divided into multiple sub-frames (first sub-frame and second sub-frame) with different gamma values. The first sub-frame uses a first gamma value optimized for white/black gray scale levels, while the second sub-frame uses a second gamma value optimized for gray scale levels. This segmentation allows each sub-frame to handle specific data requirements without loss, eliminating the need for black picture insertion.
Solution Approach 2:
The patent changes the gamma parameter between sub-frames to optimize display quality for different data requirements. By alternating between first gamma value and second gamma value in successive sub-frames, the system maintains accurate representation of all gray scale levels including white and black, while still suppressing motion blur through the multiple sub-frame structure.
2Object-affected harmful factors
If black picture is inserted to every frame, then motion blur is reduced, but brightness is reduced and amount of data shown during frame cycle is reduced
Solution Approach 1:
Instead of inserting black pictures, the frame is segmented into multiple sub-frames with different gamma values. This segmentation maintains continuous light emission and data transmission throughout the frame cycle, preserving brightness while still achieving motion blur suppression through the temporal distribution of display data across sub-frames.
Solution Approach 2:
By changing gamma values between sub-frames rather than inserting black pictures, the system maintains illumination intensity while optimizing data representation. The alternating gamma values ensure that each sub-frame contributes meaningful visual information, preventing brightness loss while suppressing motion blur.
3Object-affected harmful factors
If frame frequency is 60 Hz with black picture insertion, then motion blur is suppressed, but only thirty frames are displayed due to black picture insertion reducing data amount
Solution Approach 1:
The patent segments each frame into multiple sub-frames (first and second sub-frames) that are displayed within the same frame cycle time. This segmentation allows the system to maintain the 60 Hz frame frequency and display all 60 frames per second, rather than losing half the frames due to black picture insertion. The multiple sub-frames carry complementary data that together provide complete information.
Solution Approach 2:
By using multiple sub-frames with different gamma values instead of inserting black pictures, the system maintains continuous useful action throughout the frame cycle. Each sub-frame contributes valid display data, ensuring that the full frame frequency is utilized for displaying meaningful content rather than wasting time on black picture insertion.
Data Source
AI summary
A display device has a display panel and a driver. The display panel displays an image signal. The driver provides the display panel with a frame data in a first sub frame using a first gamma curve that has a first gamma value, and provides the display panel with the frame data in a second sub frame using a second gamma curve that has a second gamma value, wherein the second gamma value is greater than the first gamma value. Therefore, the display device may have an improved brightness and display moving pictures in a high display quality.