Liquid Crystal Display Data Signal Compensation for Strip Defects
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Solution Overview
Problem
Liquid crystal display panels face issues with strip defects due to uneven grayscale distribution among subpixels, particularly when the grayscales of subpixels in a pixel are significantly different, leading to visible stripes in the display.
Innovation Solution
A method and apparatus for compensating data signals in liquid crystal display panels by using multiple multiplexers to time-sequentially transmit data signals to subpixels, with compensation values applied to ensure balanced grayscale distribution, particularly in regions where subpixels of different colors have grayscales that are 1.5 to 5 times each other, to minimize strip defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple multiplexers are used to time-sequentially transmit data signals to subpixels, then the grayscale distribution balance is improved, but the device complexity increases
Solution Approach 1:
The display panel is divided into multiple regions, each controlled by a separate multiplexer. This segmentation allows independent control of data signal transmission to different subpixel groups, enabling precise grayscale compensation in specific regions without affecting the entire display, thus resolving the contradiction between precision and complexity.
Solution Approach 2:
Different multiplexers are assigned to control different regions of the display panel with distinct grayscale characteristics. This local quality approach allows tailored compensation strategies for each region, improving overall grayscale balance while managing complexity through regional specialization rather than uniform treatment.
2Object-affected harmful factors
If compensation values are applied to data signals in selected regions, then strip defects are reduced, but the control complexity increases
Solution Approach 1:
Compensation values are selectively applied only to selected regions exhibiting strip defects, rather than uniformly across the entire display. This local quality approach targets the harmful effects precisely where they occur, reducing strip defects while minimizing the complexity of control mechanisms to only those regions requiring compensation.
Solution Approach 2:
Compensation values are pre-calculated and stored in lookup tables before actual display operation. This preliminary action allows the system to quickly retrieve and apply appropriate compensation values during data signal transmission, reducing real-time control complexity while effectively addressing strip defects.
3Manufacturing precision
If data signals are transmitted time-sequentially through multiple multiplexers, then grayscale uniformity is improved, but the transmission time increases
Solution Approach 1:
The display panel is segmented into multiple regions, each with its own multiplexer that can operate in parallel. This segmentation enables simultaneous data signal transmission to different regions, achieving grayscale uniformity through coordinated control while eliminating the sequential time penalty associated with single-multiplexer approaches.
Solution Approach 2:
The multiplexers dynamically switch between different data signal sources based on the current display frame and region requirements. This dynamic operation allows flexible time management where different regions can be updated in overlapping time windows, maintaining grayscale uniformity while optimizing overall transmission time through adaptive scheduling.
Data Source
AI summary
A method of image display in a display apparatus having a plurality of pixels is provided. For a selected region of image in which grayscales of the subpixel of the first color, the subpixel of the second color, and the subpixel of the third color in a same pixel are L1, L2, and L3, respectively, L3≥(1.5×L2), L1≤(0.5×L2), the subpixel of a second color having grayscale of L2 and the subpixel of a third color having grayscale of L3 are spatially adjacent to each other and respectively under control of two multiplexers temporally adjacent to each other, the method includes prior to transmitting a plurality of data signals, compensating original data signals of subpixels under control of a first to an (N−1)-th multiplexers and in the selected region of image with compensation values.