Display Panel Crossover Connections for Dot Inversion
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Solution Overview
Problem
Conventional dot inversion schemes fail to effectively minimize visual defects in liquid crystal display panels with even modulo subpixel repeating groups, as they violate the condition of alternating polarities between successive subpixels, leading to noticeable visual effects and image degradation.
Innovation Solution
Implementing crossover connections and specific polarity inversion patterns in standard column driver lines to suit subpixel repeating groups, such as the RGBGBGRG pattern, and using compensation methods to correct for visual effects caused by crossovers, like adding a correction voltage or calculating average compensation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dot inversion schemes are used, then standard driver configurations are maintained, but visual defects and image degradation occur due to violated polarity alternation in even modulo subpixel groups
Solution Approach 1:
The display panel is divided into odd and even column groups, with each group handled by separate driver circuits. This segmentation allows independent polarity control for each group, enabling proper dot inversion in even modulo subpixel arrangements without requiring complete redesign of the driver system.
Solution Approach 2:
The patent applies inverse dot inversion schemes where the polarity alternation pattern is reversed or inverted in specific column groups. By inverting the polarity sequence in even column groups and using crossover connections, the system achieves proper polarity alternation for even modulo subpixel arrangements, resolving the visual defects caused by conventional schemes.
2Reliability
If crossover connections are added to achieve proper polarity alternation, then visual defects are reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the polarity inversion function from the main driver circuitry and implements it through dedicated crossover connections and separate driver circuits for odd and even column groups. This extraction allows the main driver to maintain its standard configuration while the polarity management is handled by specialized components, simplifying the overall manufacturing process.
Solution Approach 2:
Crossover connections act as intermediary elements between the driver circuits and the subpixel groups. These intermediaries facilitate proper signal routing and polarity alternation without requiring fundamental changes to the driver architecture, thereby reducing manufacturing complexity while achieving the desired polarity patterns.
3Ease of manufacture
If fewer crossover connections are used, then manufacturing complexity is reduced, but visual defects and crosstalk increase
Solution Approach 1:
The patent applies different driver configurations and polarity inversion schemes to different local regions (odd and even column groups) of the display panel. By tailoring the driver approach to the specific requirements of each region, the system achieves effective crosstalk reduction and flicker elimination without requiring uniform crossover connections across the entire panel, thus reducing overall manufacturing complexity.
Data Source
AI summary
A display is disclosed having crossover connections effecting polarity inversion. The display includes a panel comprising a subpixel repeating group having an even number of repeating subpixels in a first direction. The display also includes a driver circuit coupled to the panel to provide image data signals effecting polarity inversion to the panel. The display also includes a plurality of crossover connections from the driver circuit to the columns of the panel such that polarities of same color subpixels in the first direction alternate at a spatial frequency sufficient to abate undesirable visual affects on the panel when an image is displayed thereon; each crossover connection applying the same polarity to each subpixel in the column.