Liquid Crystal Display Pixel Layout and Drive Scheme
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Solution Overview
Problem
Liquid crystal display devices face issues with disclination due to lateral electric fields caused by pixel polarity relationships and rubbing directions, leading to display failures like image lag, blurring, and reduced contrast ratio, and increased energy consumption with the need for more signal lines.
Innovation Solution
A liquid crystal display device configuration with a column-inversion drive scheme and specific pixel layouts where sub-pixels share signal lines, optimizing the alignment of alignment films to minimize disclination and reduce energy consumption by applying the column-inversion drive scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-shielding film is used to block light on the disclination portion, then display failures are prevented, but the area of opening portions contributing to display is reduced
Solution Approach 1:
The patent extracts and eliminates the root cause of disclination by optimizing the rubbing direction of alignment films and implementing column-inversion drive schemes, thereby removing the need for light-shielding films and preserving the full display area of opening portions
2Manufacturing precision
If the number of signal lines is increased to accommodate more pixels, then display resolution is improved, but energy consumption is increased
Solution Approach 1:
The patent merges the drive schemes of adjacent columns by implementing column-inversion drive methods where adjacent columns share common signal lines and invert their polarity simultaneously, thereby reducing the total number of independent signal lines required and lowering energy consumption while maintaining high pixel density
Solution Approach 2:
Signal lines are designed to serve multiple functions by being shared across adjacent columns through the column-inversion drive scheme, where a single signal line can drive multiple sub-pixels in different columns by alternating polarity inversion, thereby reducing the overall signal line count
3Ease of manufacture
If pixel polarity relationships and rubbing directions are not optimized, then manufacturing is simpler, but disclination occurs causing display failures
Solution Approach 1:
The patent applies different rubbing directions to different alignment films in a systematic pattern, where alignment films in odd-numbered columns are rubbed in one direction and those in even-numbered columns in the opposite direction, creating local variations that eliminate lateral electric fields and prevent disclination throughout the display
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses disclination and improves display quality while reducing energy consumption by optimizing the optical properties and using a pseudo-line-inversion drive scheme, which maintains the benefits of the column-inversion drive scheme.
Implementation Method 1
In a liquid crystal display device in a mode of electrically controlled birefringence (ECB) or the like, liquid crystal molecules are undesirably influenced by a lateral electric field
Implementation Method 2
liquid crystal molecules are undesirably influenced by a lateral electric field due to a relationship between the polarities of adjacent pixels and the rubbing direction of an alignment film
Data Source
AI summary
According to one embodiment, a display device, includes a first main pixel including first to third sub-pixels, a second main pixel including fourth to sixth sub-pixels, a display driver which produces video signals to be written to the respective sub-pixels of the first and second main pixels and supplies the video signals to the respective sub-pixels via signal lines, any one of the first to third sub-pixels and any one of the fourth to sixth sub-pixels sharing one of the signal lines.