Liquid Crystal Display Boost Capacitor Side Visibility
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Solution Overview
Problem
Liquid crystal displays with vertically aligned modes face challenges in side visibility compared to front visibility, and existing methods to improve side visibility often compromise the aperture ratio and transmittance.
Innovation Solution
The implementation of a liquid crystal display design that includes a boost switching element and a boost capacitor, which applies a different data voltage to subpixels, increasing the charged voltage of one subpixel to enhance side visibility without reducing the aperture ratio, thereby improving transmittance and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If one pixel is divided into two subpixels with different voltages to improve side visibility, then side visibility is improved, but device complexity increases due to additional switching elements and capacitors
Solution Approach 1:
The pixel is divided into two subpixels (first subpixel and second subpixel) with different voltage applications. The first subpixel receives a boosted voltage through the boost capacitor while the second subpixel receives normal voltage, creating asymmetric voltage distribution to improve side visibility without requiring complete pixel redesign
Solution Approach 2:
A boost capacitor is introduced as an intermediary energy storage element connected to the first liquid crystal capacitor. This boost capacitor stores additional charge and releases it to increase the voltage applied to the first subpixel, enabling enhanced side visibility without directly modifying the basic pixel structure
2Ease of manufacture
If voltage is increased in one subpixel to enhance side visibility, then side visibility and transmittance are improved, but aperture ratio is reduced due to additional circuit elements
Solution Approach 1:
The boost capacitor is merged with the liquid crystal capacitor structure, where the boost capacitor's second terminal is connected to the first liquid crystal capacitor. This integration allows the boost function to be achieved within the existing capacitor footprint rather than adding completely separate components, thereby minimizing aperture ratio reduction
Solution Approach 2:
The first liquid crystal capacitor serves dual functions: it maintains the basic liquid crystal driving function for normal operation and simultaneously works with the boost capacitor to provide enhanced voltage for improved side visibility. This multi-functionality reduces the need for additional dedicated components that would further reduce aperture ratio
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 effectively enhances side visibility and transmittance while maintaining the aperture ratio, ensuring improved luminance and image quality.
Implementation Method 1
The liquid crystal display generates an electric field in the liquid crystal layer by applying voltage to the field generating electrodes, to determine orientations of liquid crystal molecules of the liquid crystal layer and control polarization of incident light
Implementation Method 2
The liquid crystal display generates an electric field in the liquid crystal layer by applying voltage to the field generating electrodes
Implementation Method 3
a boost capacitor including a first terminal connected with the boost switching element and a second terminal connected with the first liquid crystal capacitor
Data Source
AI summary
A liquid crystal display includes: a first gate line; a first data line crossing the first gate line; a first switching element connected with the first gate line and the first data line; a second switching element connected with the first gate line and the first data line; a first liquid crystal capacitor connected with the first switching element; a second liquid crystal capacitor connected with the second switching element; a boost switching element which is turned on during a time period not overlapping a time period during which the first switching element is turned on; and a boost capacitor including a first terminal connected with the boost switching element and a second terminal connected with the first liquid crystal capacitor.