LCD Driver Circuit Heat and Smear Reduction via Segmented Video Lines
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Solution Overview
Problem
Conventional liquid crystal display devices with divided display regions experience increased heat emission and image quality issues due to the load on driver circuits and longitudinal smears when using dot inversion or column inversion methods, leading to potential malfunctions and reduced image quality.
Innovation Solution
A liquid crystal display device design where the display region is divided into two areas with alternating polarity signals applied to video signal lines and symmetrical arrangement of TFT elements and pixel electrodes, reducing the load on driver circuits and preventing longitudinal smears by ensuring consistent signal polarity across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dot inversion or column inversion methods are used in liquid crystal display devices with divided display regions, then the display speed is improved, but heat emission from driver circuits increases and image quality deteriorates due to longitudinal smears
Solution Approach 1:
The display region is divided into two separate display regions (first display region and second display region) along a border line. Video signal lines are electrically isolated between the two regions, with each region having its own set of video signal lines connected to drains of TFT elements in that region. This segmentation allows independent signal application to each region, reducing the overall load on driver circuits while maintaining high display speed.
2Speed
If dot inversion or column inversion methods are used in liquid crystal display devices with divided display regions, then the display speed is improved, but image quality deteriorates due to longitudinal smears
Solution Approach 1:
The patent applies different signal polarity arrangements to different regions. In the first display region, pixels connected to one video signal line have a specific polarity arrangement, while in the second display region, pixels connected to corresponding video signal lines have alternating polarity. This local quality differentiation prevents longitudinal smears in each region while maintaining overall image quality across the divided display.
3Device complexity
If signal input terminals are provided only on the left and top of the display region, then the device complexity is reduced, but the difference in signal delay between pixels becomes great, lowering image quality
Solution Approach 1:
The display region is segmented into two separate regions with electrically isolated video signal lines. Each region can be driven independently with optimized signal routing, allowing signal input terminals to be positioned to minimize delay differences within each region while maintaining overall system simplicity.
4Productivity
If the display region is divided into two regions with electrically isolated video signal lines, then the load on driver circuits is reduced and display speed is improved, but the device complexity increases
Solution Approach 1:
The display region is segmented into two separate display regions with electrically isolated video signal lines. Each region has its own set of video signal lines connected to drains of TFT elements in that region, allowing independent signal application and reducing driver circuit load while maintaining manageable complexity through modular organization.
5Manufacturing precision
If alternating polarity signals are applied to video signal lines in divided display regions, then longitudinal smears are prevented and image quality is maintained, but the device complexity increases
Solution Approach 1:
The patent implements alternating polarity signal application specifically in the second display region, while the first display region uses a different polarity arrangement. This local quality approach prevents longitudinal smears in the second region through alternating polarity on adjacent video signal lines, while maintaining overall image quality across both regions through coordinated signal control.
Data Source
AI summary
A liquid crystal display device where one display region of the liquid crystal display panel is divided into a first display region and a second display region along a border line in the direction in which scanning signal lines extend, a video signal line to which TFT elements of pixels in the first display region are connected and a video signal line to which TFT elements of pixels in the second display region are connected are electrically isolated from each other. Pixels having TFT elements connected to one of two adjacent video signal lines and pixels TFT elements connected to the other of the two adjacent video signal lines are alternate in a column of a number of pixels aligned in the direction in which the video signal lines extend in the first display region and the second display region.