LCD Sub-Pixel Electrodes and Storage Capacitors for Aperture Ratio
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Solution Overview
Problem
Existing liquid crystal displays (LCDs) face challenges in improving transmittance and visibility while maintaining a high aperture ratio, as increasing the number of cutouts and protrusions to enhance viewing angles often reduces the aperture ratio and fails to significantly enhance transmittance.
Innovation Solution
The implementation of a liquid crystal display (LCD) structure with multiple storage capacitors and switching elements, where the polarity of storage electrode signals is varied to adjust the voltage of liquid crystal capacitors, and the use of sub-pixel electrodes with different inclination directions to optimize light transmission and visibility, allowing for improved transmittance and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutouts and protrusions are added to field-generating electrodes to widen viewing angle, then reference viewing angle is improved, but aperture ratio deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode) with different inclination directions. This segmentation allows each sub-pixel electrode to control liquid crystal molecules in specific regions, achieving wide viewing angle without requiring cutouts that would reduce aperture ratio.
Solution Approach 2:
Different regions of the pixel are assigned different electrode structures with specific inclination directions. The first sub-pixel electrode has a first inclination direction and the second sub-pixel electrode has a second inclination direction, creating local quality variations that optimize light transmission from different viewing angles while maintaining high aperture ratio.
2Illumination intensity
If voltage is increased to improve transmittance, then light transmission is improved, but power consumption increases
Solution Approach 1:
The LCD employs dynamic voltage adjustment through multiple storage capacitors that can independently control the voltage applied to different sub-pixel electrodes. By dynamically adjusting voltage levels rather than using fixed high voltage, the system achieves high transmittance when needed while reducing power consumption during normal operation.
Solution Approach 2:
The invention changes the voltage parameter dynamically by using different storage electrode signals (first storage electrode signal and second storage electrode signal with opposite phases) to adjust the voltage across liquid crystal capacitors. This allows optimization of transmittance by adjusting voltage parameters rather than permanently increasing power consumption.
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 approach enhances the transmittance and visibility of the LCD while increasing the aperture ratio, ensuring better lateral visibility by adjusting the voltage across liquid crystal capacitors and optimizing the design of sub-pixel electrodes.
Implementation Method 1
The pixel electrodes and the common electrode are supplied with different voltages to generate an electric field in the LC layer that determines orientations of LC molecules within the LC layer
Implementation Method 2
Since the orientations of the LC molecules determine the transmittance of incident light, the LCD can display desired images by adjusting the voltage differences between the pixel electrodes and the common electrode
Data Source
AI summary
A liquid crystal display (“LCD”) includes a plurality of pixels, each including first and second liquid crystal capacitors, a first storage capacitor including a first terminal connected to the second liquid crystal capacitor and a second terminal applied with a first storage electrode signal, a second storage capacitor including a first terminal connected to the second liquid crystal capacitor and a second terminal applied with a second storage electrode signal having an opposite phase to the first storage electrode signal, and a third storage capacitor including a first terminal connected to the first liquid crystal capacitor and a second terminal applied with the first or second storage electrode signal. A driving method of the LCD improves transmittance and visibility and increases an aperture ratio thereof.