Floating Electrode Pixel Electrode Luminance Control
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving three different luminance levels with a single transistor, which affects image visibility and aperture ratio, and requires optimization of electric field magnitudes and electrode configurations.
Innovation Solution
A display device design featuring a pixel electrode with three regions of different electric field magnitudes, utilizing a floating electrode and a common-voltage electrode with specific overlapping configurations, and a passivation layer with varying thicknesses to achieve distinct luminance levels, allowing for improved visibility and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional liquid crystal display device uses a single transistor to control pixel luminance, then the device complexity is reduced, but the ability to achieve three different luminance levels is limited
Solution Approach 1:
The pixel electrode is divided into three distinct regions (first, second, and third portions) that overlap with different electrodes (floating electrode, common-voltage electrode) to create three different electric field magnitudes and luminance levels using a single transistor
Solution Approach 2:
Different portions of the pixel electrode are positioned to overlap with different electrodes at different locations, creating locally distinct electric field strengths that correspond to different luminance levels in the display image
2Adaptability or versatility
If the pixel electrode overlaps with floating electrode and common-voltage electrode in specific configurations, then three different luminance levels are achieved, but the aperture ratio is reduced
Solution Approach 1:
The pixel electrode is designed with different portions extending in different directions (first direction and second direction perpendicular to image display side) to overlap with floating and common-voltage electrodes at different spatial positions, creating multiple luminance levels without requiring additional transistors
3Adaptability or versatility
If the passivation layer has varying thicknesses in different regions, then electric field magnitudes are optimized for three luminance levels, but the manufacturing precision requirements increase
Solution Approach 1:
The passivation layer is designed with different thicknesses in different regions (first, second, and third portions) corresponding to the three luminance levels, with the first portion having a first thickness, the second portion having a second thickness, and the third portion having a third thickness to optimize electric field magnitudes
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
The design enables the display device to provide three different luminance levels with a single transistor, enhancing image visibility and alleviating potential afterimage issues while optimizing response speed and image texture.
Implementation Method 1
The liquid crystal display device may display an image by applying a voltage to the field generating electrode to generate an electric field in the liquid crystal layer. The electric field may determine orientations of liquid crystal molecules of the liquid crystal layer, for controlling transmission of light through the liquid crystal layer.
Data Source
AI summary
A display device may include a floating electrode, a common-voltage electrode, a transistor, and a pixel electrode. The floating electrode may be electrically floating. The common-voltage electrode may be electrically connected to a voltage source. The pixel electrode may be electrically connected to the transistor. A first portion of the pixel electrode may overlap neither of the floating electrode and the common-voltage electrode in a direction perpendicular to at least one of the pixel electrode and an image display side of the display device. A second portion of the pixel electrode may overlap the common-voltage electrode. A third portion of the pixel electrode may overlap the floating electrode.