Pixel Structure With Shared TFT Drive for Wider LCD Viewing Angles
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Solution Overview
Problem
Large-sized vertical alignment liquid crystal display panels suffer from color shifts at large viewing angles due to birefringence differences in liquid crystal molecules, and existing solutions like 3T_8 and 3T_12 domain pixel designs require multiple transistors, reducing aperture ratio and transmittance.
Innovation Solution
A pixel structure with a thin film transistor electrically connecting a main sub-pixel and at least one secondary sub-pixel, where the pretilt angles of the branch electrodes are controlled to differ, allowing for a single transistor to drive multiple sub-pixels and reduce color shift, thereby improving aperture ratio and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple transistors are used in 3T_8 domain or 3T_12 domain pixel designs to alleviate color shift, then color shift is reduced, but aperture ratio and transmittance are greatly reduced
Solution Approach 1:
The patent merges multiple sub-pixels (main sub-pixel and secondary sub-pixels) into a single pixel unit that shares common transistors and electrodes. Specifically, the main pixel electrode and secondary pixel electrodes share common storage capacitors and liquid crystal capacitors, allowing multiple sub-pixels to be driven with fewer transistors while maintaining different pretilt angles to reduce color shift.
Solution Approach 2:
The patent implements multi-functionality by having the main pixel electrode and secondary pixel electrodes share common electrical connections including storage capacitors and liquid crystal capacitors. This universal sharing of components allows the pixel structure to achieve multiple functions (driving main and secondary sub-pixels) with reduced component count, thereby improving aperture ratio while maintaining color shift correction.
2Object-affected harmful factors
If multiple transistors are used in 3T_8 domain or 3T_12 domain pixel designs to alleviate color shift, then color shift is reduced, but transmittance is greatly reduced
Solution Approach 1:
The patent merges multiple sub-pixels (main sub-pixel and secondary sub-pixels) into a single pixel unit that shares common transistors and electrodes. Specifically, the main pixel electrode and secondary pixel electrodes share common storage capacitors and liquid crystal capacitors, allowing multiple sub-pixels to be driven with fewer transistors while maintaining different pretilt angles to reduce color shift.
Solution Approach 2:
The patent implements multi-functionality by having the main pixel electrode and secondary pixel electrodes share common electrical connections including storage capacitors and liquid crystal capacitors. This universal sharing of components allows the pixel structure to achieve multiple functions (driving main and secondary sub-pixels) with reduced component count, thereby improving aperture ratio and light transmittance.
3Area of stationary object
If a single transistor drives multiple sub-pixels with different pretilt angles, then aperture ratio is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by giving different pretilt angles to different sub-pixels within the same pixel unit. The main pixel electrode has a first pretilt angle while secondary pixel electrodes have second pretilt angles different from the first. This local differentiation in pretilt angles allows each sub-pixel to be optimized for specific viewing angles, reducing color shift while sharing common driving components.
Solution Approach 2:
The patent segments the pixel into a main sub-pixel and secondary sub-pixels with different pretilt angle characteristics. This segmentation allows different regions of the pixel to have optimized optical properties for different viewing conditions, while the shared electrical infrastructure reduces overall device complexity.
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
This configuration effectively alleviates color shift and enhances viewing angles by using a single transistor to drive multiple sub-pixels, reducing the number of transistors needed and conserving space, which improves aperture ratio and light transmission, ultimately reducing power consumption.
Implementation Method 1
due to a large difference in birefringence of liquid crystal molecules at different viewing angles, the display panels will have color shifts at large viewing angles
Data Source
AI summary
The present application provides a pixel structure and a display panel. Each of a plurality of sub-pixel units includes a main sub-pixel, at least one secondary sub-pixel, and a thin film transistor electrically connecting the main sub-pixel and the at least one secondary sub-pixel, wherein by controlling a pretilt angle of a first branch electrode of the main sub-pixel to be different from a pretilt angle of a second branch electrode of the secondary sub-pixel, a driving voltage of the main sub-pixel and a driving voltage of the secondary sub-pixel are different, so that color shift can be effectively alleviated and wider viewing angles can be obtained, thus being beneficial to improve an aperture ratio and light transmission of the pixel structure.