Liquid Crystal Display Pixel Electrode Slit Design for Brightness
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Solution Overview
Problem
Conventional liquid crystal display devices have a small pixel opening ratio due to the alignment of scanning and video signal lines, leading to a darker screen and the need for high-brightness backlights as resolution increases.
Innovation Solution
The liquid crystal display device configuration is modified by adjusting the connection of TFT elements to scanning and video signal lines, allowing two TFT elements per pixel with alternating connections to different video signal lines, and reducing the number of scanning signal lines to increase the pixel opening ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional alignment of scanning and video signal lines is used, then device complexity is reduced, but pixel opening ratio decreases leading to darker screen
Solution Approach 1:
The pixel electrode is divided into multiple regions with different connection patterns to scanning and video signal lines. Specifically, pixels are segmented into those connected to even-numbered scanning lines and those connected to odd-numbered scanning lines, allowing alternating connection patterns that optimize opening ratio while maintaining manageable device complexity
Solution Approach 2:
The patent merges the functions of scanning line connections by having multiple pixels share common scanning line connections in an alternating pattern. This allows the device to achieve higher opening ratios without proportionally increasing the number of scanning lines, thus merging multiple pixel connections into shared signal paths
2Illumination intensity
If number of scanning signal lines is increased to maintain pixel alignment, then manufacturing precision is improved, but pixel opening ratio decreases
Solution Approach 1:
Instead of increasing the number of scanning lines to improve pixel alignment, the patent inverts the approach by reducing scanning line density and using alternating connection patterns. Pixels are connected to scanning lines in an inverted traditional pattern where adjacent pixels connect to different scanning lines, achieving precise alignment with fewer lines and higher opening ratios
3Illumination intensity
If high-brightness backlight is used to compensate for small opening ratio, then screen brightness is improved, but power consumption increases
Solution Approach 1:
The patent extracts the need for high-brightness backlights by fundamentally changing the pixel structure to achieve higher opening ratios. By taking out the problematic signal line alignment constraints and replacing them with alternating TFT connection patterns, the system achieves sufficient screen brightness through structural optimization rather than relying on high-power backlight compensation
Data Source
AI summary
A liquid crystal display device having an active matrix display panel with pixel regions having two pixel electrodes and two TFT elements thereon. The two pixel electrodes are formed in each of the pixel regions, the two pixel electrodes are connected to different ones of the two TFT elements and one counter electrode is formed in each of the pixel regions, the counter electrode being formed between a layer of the pixel electrode and a first substrate. Each pixel electrode in the pixel regions has plural slits, the slits in each pixel electrode extending in two directions, and the slits extend in a direction which is not parallel to an extending direction of either of a video signal line or a scanning signal line formed on the first substrate. The two pixel electrodes in the pixel region have adjacent pixel electrode sides which are parallel to each other.