LCD Output Buffer Arrangement for Channel Offset Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LCD devices struggle to simultaneously horizontally and vertically compensate offsets between channels, leading to brightness differences and flickering issues due to mismatched transistors in output buffers, which are not effectively addressed by existing inversion driving methods.
Innovation Solution
The method involves alternately arranging first and second type output buffers in units of rows and columns to create a symmetrical structure, ensuring that output buffers with opposite types are arranged in adjacent columns or rows, thereby compensating for offsets both horizontally and vertically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional output buffers are used with single polarity inversion, then pixel deterioration is prevented, but offset between channels causes brightness differences and flickering
Solution Approach 1:
The patent applies asymmetry by using different inversion patterns for different pixel groups. Specifically, first pixel groups use vertical inversion while second pixel groups use horizontal inversion, creating intentional asymmetric treatment across the display panel. This asymmetric approach allows offset compensation in both vertical and horizontal directions simultaneously, eliminating brightness differences and flickering while maintaining pixel reliability through continued polarity inversion.
2Illumination intensity
If dot inversion driving method is used to reduce flicker, then luminance difference between pixels is reduced, but offset between channels remains unaddressed
Solution Approach 1:
The patent segments the display panel into multiple pixel groups with different inversion characteristics. By dividing pixels into first pixel groups (vertical inversion) and second pixel groups (horizontal inversion), the system can independently compensate for offsets in different directional channels. This segmentation enables precise offset compensation for both vertical and horizontal channels simultaneously, while maintaining the flicker-reducing benefits of dot inversion driving.
3Device complexity
If source driver channels are arranged conventionally, then device complexity is low, but horizontal and vertical offset compensation cannot be achieved simultaneously
Solution Approach 1:
The patent extends the compensation approach from a single dimension to two dimensions by implementing both vertical inversion for first pixel groups and horizontal inversion for second pixel groups. This dimensional expansion allows the system to address offset issues in both vertical and horizontal channels simultaneously without significantly increasing device complexity, achieving precise two-dimensional offset compensation through the coordinated operation of the source driver channels.
Data Source
AI summary
A method of removing offsets between channels of a liquid crystal panel is provided. The method includes: alternately arranging first type output buffers and second type output buffers for driving the pixels in units of at least two rows of the pixels; and arranging the first type output buffers and the second type output buffers in units of at least two columns of the pixels so that the output buffers with types opposite to those of previous two columns are arranged. The second type output buffers are embodied by switching connections among the differential transistors and connections among the load transistors in the first type output buffers.