Liquid Crystal Display Data Driver Heat Reduction via Dot Inversion
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Solution Overview
Problem
Conventional liquid crystal display panels with the double-scanning line method face issues with high heat values and unstable video signal potentials, leading to decreased image quality, and struggle to perform dot inversion driving effectively.
Innovation Solution
The implementation of a liquid crystal display device with a common inversion driving method, where two scanning signal lines are arranged between neighboring pixel electrodes, and the common voltage is alternately changed between two potentials, allowing for reduced heat and improved dot inversion driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one video signal line is arranged for every two neighboring pixels in the double-scanning line method, then the number of video signal lines is reduced, but the heat value of the data driver increases and video signal potential becomes unstable
Solution Approach 1:
The patent segments the pixel array into even-numbered pixel rows and odd-numbered pixel rows, with each row type connected to dedicated scanning signal lines. This segmentation allows independent control and reduces the burden on individual data drivers, thereby reducing heat generation while maintaining signal stability.
Solution Approach 2:
The patent introduces a new dimension of control by adding scanning signal lines that extend in the row direction (y-direction), perpendicular to the conventional column-direction scanning lines. This dimensional addition creates a two-dimensional scanning matrix that distributes the driving burden more evenly across multiple drivers.
2Use of energy by stationary object
If the double-scanning line method is used to reduce the number of data drivers, then power consumption is reduced, but dot inversion driving cannot be performed effectively
Solution Approach 1:
The patent implements dynamic polarity inversion by alternating the polarity of video signals between even-numbered pixel rows and odd-numbered pixel rows. This dynamic approach allows dot inversion driving to be performed effectively while maintaining the reduced power consumption benefits of the double-scanning line method.
Solution Approach 2:
The patent applies different scanning line connections to different regions: even-numbered pixel rows are connected to one set of scanning signal lines while odd-numbered pixel rows are connected to another set. This local differentiation enables region-specific polarity control, making dot inversion driving possible throughout the display.
3Device complexity
If conventional scanning line arrangement is used, then circuit simplicity is maintained, but image quality deteriorates due to unstable video signal potential
Solution Approach 1:
The patent introduces common potential lines as intermediary elements that connect to multiple scanning signal lines. These common potential lines act as mediators to stabilize the video signal potential across different scanning lines, reducing potential fluctuations without significantly complicating the overall circuit structure.
Data Source
AI summary
The present invention prevents deterioration of image quality by lowering a heat value of a data driver connected to a liquid crystal display panel. In a liquid crystal display device, a pixel which connects a TFT thereof to one of two neighboring scanning signal lines and a pixel which has a TFT thereof connected to the other scanning signal line are alternately arranged in the extending direction of the scanning signal lines, two pixels which are arranged close to each other with one video signal line sandwiched therebetween have respective TFTs connected to the video signal line, and the connection relationship between the TFT of each pixel and the scanning signal line is inverted for every pair of two pixels arranged in the extending direction of the video signal lines.