Blue Phase Liquid Crystal Display Panel with Optical Path Diverting Device
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Solution Overview
Problem
Existing blue phase liquid crystal display apparatuses require high driving voltage due to the use of lateral electric fields, which are not compatible with perpendicular light, leading to inefficiencies in light control and display performance.
Innovation Solution
A display panel design that incorporates optical path diverting devices between substrates to redirect light perpendicular to the panel, allowing for the application of a vertical electric field that drives the blue phase liquid crystal, thereby reducing the need for high driving voltage and improving light control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a lateral electric field is used to drive blue phase liquid crystal, then the liquid crystal can be stretched and induce birefringence, but the driving voltage becomes too large
Solution Approach 1:
The patent changes the direction of the electric field from lateral (in-plane) to vertical (perpendicular to the substrate). This dimensional change allows the electric field to act effectively on the liquid crystal molecules throughout the layer thickness, achieving birefringence induction with much lower voltage. The optical path diverting device compensates for the directional change to maintain display functionality.
Solution Approach 2:
The patent introduces an optical path diverting device as an intermediary component between the substrate and the liquid crystal layer. This device redirects the optical path to work in conjunction with the vertical electric field, enabling the field to effectively stretch the liquid crystal molecules and induce birefringence without requiring high lateral voltage.
2Power
If a perpendicular electric field is used to drive blue phase liquid crystal, then the driving voltage is reduced, but the light propagation becomes incompatible
Solution Approach 1:
The optical path diverting device serves as an intermediary that bridges the incompatibility between vertical electric field and perpendicular light propagation. It redirects the light path to pass through the liquid crystal layer in a manner that is compatible with the vertical field-induced birefringence, enabling both low voltage operation and proper light modulation.
Solution Approach 2:
The patent modifies the optical path direction using the diverting device to work in conjunction with the vertical electric field. By changing the dimensional relationship between light propagation and electric field direction, the system achieves compatibility between perpendicular field application and light modulation functionality.
3Ease of operation
If a lateral electric field is used, then blue phase liquid crystal can be driven near pixel and common electrodes, but the field intensity is insufficient to penetrate the whole liquid crystal layer
Solution Approach 1:
The patent transitions from lateral electric field application to vertical electric field application. This dimensional change allows the electric field to penetrate through the entire liquid crystal layer thickness effectively, as the field lines extend perpendicular to the substrate planes, ensuring uniform field distribution and adequate field intensity throughout the layer.
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 vertical electric field configuration enables efficient light control and gray level display without the need for high driving voltages, enhancing the performance and efficiency of blue phase liquid crystal displays.
Implementation Method 1
when voltage is applied, the blue phase liquid crystal can be regarded as being stretched into an equivalent particulate shape having a major axis consistent with the electric field and assume optical anisotropy and will cause optical path difference in the light passing it according to birefringence principle (Kerr effect)
Implementation Method 2
An optical path diverting device is provided between the first substrate and the second substrate, the optical path diverting device is configured so that a light entering the blue phase liquid crystal layer in the first direction from the first substrate is diverted to propagate in the blue phase liquid crystal layer in a second direction parallel to the display panel
Data Source
AI summary
The present application discloses a display panel, comprising: a first substrate, a second substrate, and a blue phase liquid crystal layer interposed between the first substrate and the second substrate. The first substrate and the second substrate are adapted to generate an electric field in a first direction perpendicular to the display panel. An optical path diverting device is provided between the first substrate and the second substrate, the optical path diverting device is configured so that a light entering the blue phase liquid crystal layer in the first direction from the first substrate is diverted to propagate in the blue phase liquid crystal layer in a second direction parallel to the display panel, and then the light propagating in the second direction is diverted to pass through the blue phase liquid crystal layer and exit from the second substrate in the first direction. According to the present invention, by providing an optical path diverting device in the liquid crystal cell, the display panel can perform normal display even under a vertical electric field, and thus solves the problem that the driving voltage is too large by using a lateral electric field.