Liquid Crystal Display Device with Conductive Line Electric Field
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving high-speed driving and low power consumption while maintaining high transmittance and reducing response time, particularly in vertical alignment mode, due to issues with power consumption and response time (τoff) in fringe field switching mode and vertical electric field methods.
Innovation Solution
A liquid crystal display device with a display-device substrate and array substrate configuration that includes a transparent substrate, transparent resin layer, and conductive lines, where a conductive line generates an electric field traversing the source line, allowing for efficient liquid crystal driving and touch sensing by applying reset voltages to shorten τoff and improve transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fringe field switching mode is used to achieve high-speed driving, then response time is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by using alternating horizontal and vertical electric fields in a time-division manner. The horizontal electric field is applied during the display period to maintain liquid crystal alignment, while the vertical electric field is applied periodically during non-display periods to reset the liquid crystal molecules. This periodic switching enables high-speed response without continuous power consumption, resolving the contradiction between fast response time and low power consumption.
2Illumination intensity
If vertical electric field is continuously applied to maintain display, then transmittance is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by switching between horizontal and vertical electric field application modes. During the display period, the horizontal electric field maintains liquid crystal alignment for good transmittance. During non-display periods, the vertical electric field is applied to reset liquid crystal molecules to their initial vertical alignment. This periodic switching eliminates the need for continuous vertical field application, significantly reducing power consumption while maintaining display quality.
Solution Approach 2:
The patent applies the discarding and recovering principle by temporarily discarding the vertical electric field during the display period and recovering it during non-display periods. The horizontal electric field is used to maintain display state, and the vertical electric field is recovered to reset the liquid crystal molecules. This alternating use of electric fields reduces continuous power consumption while maintaining display performance.
3Adaptability or versatility
If FFS mode is used to achieve wide viewing angle, then viewing angle is improved, but light leakage increases at high definition
Solution Approach 1:
The patent applies parameter changes by dynamically switching the direction of the electric field (from horizontal to vertical) depending on the operational phase. During display, the horizontal electric field maintains liquid crystal alignment for wide viewing angle. During non-display periods, the vertical electric field resets the liquid crystal molecules to vertical alignment, which prevents light leakage at high definition resolutions. This parameter switching resolves the contradiction between wide viewing angle and light leakage control.
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 solution enables faster liquid crystal response times, reduced power consumption, and improved transmittance by efficiently aligning liquid crystals and facilitating touch sensing, addressing the limitations of existing technologies.
Implementation Method 1
a conductive line parallel to the source line and formed in a portion on the first insulation layer where pixel electrodes are divided in a plan view... such that an electric field oriented in a direction traversing the source line in the plan view is generated between conductive lines
Implementation Method 2
a liquid crystal layer sandwiched between the display-device substrate and the array substrate and including liquid crystal molecules having negative dielectric anisotropy and initially aligned vertically
Data Source
AI summary
A liquid crystal display device includes a display-device substrate having a transparent electrode; an array substrate having a pixel electrode, a source line, a gate line, and a conductive line; a liquid crystal layer sandwiched between the display-device substrate and initially aligned vertically; and a controller that drives the liquid crystal layer by supplying an image signal to the source line and applying a liquid crystal driving voltage across the transparent electrode and the pixel electrode in synchronization with the image signal, the controller applying a voltage to the conductive line after the liquid crystal driving voltage is applied to the pixel electrode and while the liquid crystal driving voltage is not applied to the pixel electrode, thereby generating an electric field oriented in a direction intersecting the source line in a plan view between the conductive lines.