Liquid Crystal Display Device With Switchable Vertical And Lateral Fields
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Solution Overview
Problem
Liquid crystal display devices used for see-through displays suffer from background blur, known as double images, due to the alignment of liquid crystal molecules by applied voltage, which deteriorates display quality.
Innovation Solution
A liquid crystal display device with a specific electrode structure that allows for switchable vertical and lateral fields across the liquid crystal layer, featuring interdigitated electrodes with multiple pitches and directions, enabling a transparent displaying state without voltage application, which prevents background blur by aligning liquid crystal molecules in a twist configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage is applied to align liquid crystal molecules for displaying, then response characteristics improve, but background blur occurs due to molecule alignment
Solution Approach 1:
The patent applies dynamic switching between vertical and lateral electric fields to control liquid crystal molecule alignment. By alternating the field direction, the system achieves rapid response while preventing permanent alignment that causes background blur, thus resolving the contradiction between response speed and display quality.
Solution Approach 2:
The patent employs periodic switching between vertical and lateral fields in a cyclic manner. This periodic action allows the liquid crystal molecules to respond quickly to field changes while returning to a neutral state that prevents background blur, simultaneously improving response characteristics and maintaining display quality.
2Manufacturing precision
If color filters and polarizing plates are used in liquid crystal display devices, then display quality improves, but light utilization efficiency deteriorates
Solution Approach 1:
The patent extracts and removes the color filters and polarizing plates from the conventional liquid crystal display structure. By eliminating these light-absorbing components, the system achieves high light utilization efficiency while maintaining display quality through alternative coloring methods using liquid crystal optical properties.
Solution Approach 2:
The patent replaces the mechanical/optical filtering system (color filters and polarizing plates) with an electric field-controlled system. By using vertical and lateral electric fields to control liquid crystal orientation and color, the system eliminates light-absorbing filters while maintaining display quality, thus resolving the contradiction between display quality and light utilization efficiency.
3Loss of energy
If field sequential method is used to eliminate color filters, then light utilization efficiency improves, but rapid response is required
Solution Approach 1:
The patent merges the field sequential method with a dual-field structure (vertical and lateral fields). This combination allows the system to maintain the light utilization efficiency benefits of field sequential coloring while using the rapid-response capabilities of lateral field switching, thus resolving the contradiction between light utilization efficiency and response speed.
Solution Approach 2:
The patent applies dynamic switching between vertical and lateral electric fields to achieve both field sequential coloring and rapid response. The lateral field provides fast switching for color transitions, while the vertical field maintains the field sequential approach, simultaneously achieving high light utilization efficiency and rapid response characteristics.
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 enhances both response characteristics and display quality by preventing background blur and allowing vivid see-through displays, while maintaining high light utilization efficiency without the need for color filters.
Implementation Method 1
a second electrode for generating a lateral field across the liquid crystal layer in cooperation with the first electrode
Implementation Method 2
the torque due to voltage application acts on the liquid crystal molecules
Implementation Method 3
a third electrode opposing the first electrode and the second electrode for generating a vertical field across the liquid crystal layer in cooperation with the first electrode and the second electrode
Implementation Method 4
a vertical field is generated across the liquid crystal layer in either one of the transition (rise) from a black displaying state to a white displaying state
Implementation Method 5
each of the plurality of pixels is capable of switchably presenting a black displaying state where black displaying is performed with a vertical field being generated across the liquid crystal layer, a white displaying state where white displaying is performed with a lateral field being generated across the liquid crystal layer, or a transparent displaying state where a rear face side of the liquid crystal display panel is visible in a see-through manner with no voltage being applied to the liquid crystal layer
Data Source
AI summary
A liquid crystal display device (100) includes a liquid crystal display panel (1) including a first substrate (10), a second substrate (20), and a liquid crystal layer (30). The first substrate includes a first electrode (11) provided for each pixel, and a second electrode (12) for generating a lateral field across the liquid crystal layer in cooperation with the first electrode. The second substrate includes a third electrode (21) for generating a vertical field across the liquid crystal layer in cooperation with the first electrode and the second electrode. Each pixel is capable of switchably presenting a black displaying state where a vertical field is generated across the liquid crystal layer, a white displaying state where a lateral field is generated across the liquid crystal layer, and a transparent displaying state where a rear face side of the liquid crystal display panel is visible in a see-through manner with no voltage being applied to the liquid crystal layer. The first electrode includes a plurality of linear portions (11a), the plurality of linear portions being arranged so that at least one of the following exists in a plurality: the direction that the linear portions extend and the pitch of the linear portions.