VA LCD Pixel Structure with Interdigitated Electrodes
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Solution Overview
Problem
Conventional liquid crystal display devices with privacy filters or adjustable view angle screens face issues of reduced brightness when switching between wide and narrow view modes, as additional sub-pixels are either inactive or decrease overall brightness.
Innovation Solution
A vertical alignment mode liquid crystal display device with a pixel structure featuring interdigitated comb-shaped electrodes and pixel transistors, where different data voltages are applied to each comb-shaped electrode pair to control liquid crystal molecule orientation, allowing for adjustable view angles without compromising brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adjustable privacy screen with additional view angle controllable sub-pixel is designed, then view angle adjustability is improved, but display brightness is decreased when operating in wide view mode
Solution Approach 1:
The pixel electrode is divided into multiple comb-shaped electrode pairs, with each pair independently controllable through separate pixel transistors. This segmentation allows different regions of the pixel to be controlled differently, enabling view angle adjustment without requiring additional sub-pixels that would reduce brightness.
Solution Approach 2:
The patent implements dynamic control of liquid crystal molecule orientation by applying different data voltages to different comb-shaped electrode pairs. The view angle can be dynamically adjusted between wide and narrow modes through voltage control, eliminating the need for physical or structural changes that would compromise brightness.
2Adaptability or versatility
If a 3M privacy filter is used to achieve privacy effect, then privacy functionality is improved, but display brightness is decreased
Solution Approach 1:
The patent replaces the mechanical/optical approach of using physical privacy filters with an electrical control approach. By using comb-shaped electrode pairs and pixel transistors to control liquid crystal molecule orientation, the system achieves privacy functionality through voltage control rather than physical filtering, thereby maintaining display brightness.
Solution Approach 2:
The patent changes the operational parameters of the liquid crystal display by applying different data voltages to different comb-shaped electrode pairs. This parameter control enables the liquid crystal molecules to orient in different directions, achieving privacy functionality without the brightness loss associated with physical privacy filters.
3Adaptability or versatility
If additional view angle adjustable sub-pixel is added to each pixel, then view angle control capability is improved, but device complexity is increased
Solution Approach 1:
The comb-shaped electrode pairs serve multiple functions: they control liquid crystal molecule orientation for view angle adjustment, maintain display brightness, and enable privacy functionality. By making the existing pixel structure multi-functional, the patent eliminates the need for additional sub-pixels and reduces overall device complexity.
Solution Approach 2:
The patent merges the view angle control function with the existing pixel electrode structure by using comb-shaped electrode pairs. Instead of adding separate sub-pixels for view angle adjustment, the design integrates this capability into the standard pixel structure, thereby reducing 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
Enables seamless switching between wide and narrow view modes without decreasing the display panel's brightness, as the liquid crystal molecules can be aligned to various orientations using different data voltages, maintaining privacy functionality.
Implementation Method 1
different data voltages are applied to each comb-shaped electrode pair to control liquid crystal molecule orientation
Implementation Method 2
The comb-shaped electrodes are electrically coupled to receive a plurality of data voltages through the respective pixel transistors. At least a part of the data voltages are different, and the data voltages received by the two comb-shaped electrodes in each comb-shaped electrode pair are different from each other.
Data Source
AI summary
A pixel structure adapted to a vertical alignment (VA) mode liquid crystal display (LCD) device is provided. The pixel structure includes a plurality of comb-shaped electrodes and a plurality of pixel transistors. The comb-shaped electrodes are interdigitated in a pairwise manner and thereby constitute at least one comb-shaped electrode pair. The pixel transistors respectively are electrically coupled to the comb-shaped electrodes. The comb-shaped electrodes respectively are electrically coupled to receive a plurality of data voltages through the respective pixel transistors and whereby at least a part of the data voltages are different, and the data voltages received by the two comb-shaped electrodes of each comb-shaped electrode pair are different from each other. Moreover, a VA mode LCD device using the pixel structure and a pixel driving method adapted thereto are also provided.