Liquid Crystal Shutter Leakage Light Suppression
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Solution Overview
Problem
Liquid crystal shutter devices in display units often suffer from leakage light issues, leading to deteriorated display quality and visibility of images outside the intended viewing angle, especially when operating in the non-scattering mode.
Innovation Solution
A liquid crystal display device incorporating a polymer dispersion type liquid crystal layer with polymers aligned in a twisted manner and a polarization layer positioned between the liquid crystal panel and the shutter device, where the polarization layer's absorption axis is set perpendicular to the radial direction of the twisted polymers, effectively absorbing leakage light and allowing precise control over the scattering mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a liquid crystal shutter device operates in non-scattering mode, then power consumption is reduced and responsiveness is improved, but leakage light occurs and display quality deteriorates
Solution Approach 1:
A circular polarizing film is introduced as an intermediary element between the liquid crystal shutter device and the viewer. This polarizing film specifically targets and absorbs the leakage light component while allowing the intended display light to pass through, thereby resolving the contradiction between low power consumption operation and leakage light suppression
2Speed
If a liquid crystal shutter device operates in non-scattering mode, then switching speed is improved, but visibility of images outside viewing angle increases
Solution Approach 1:
The circular polarizing film serves as a mediator that selectively blocks light rays outside the intended viewing angle while maintaining the fast switching characteristics of the non-scattering mode operation. This allows the system to achieve high switching speed without sacrificing viewing angle control
3Object-affected harmful factors
If a liquid crystal shutter device operates in scattering mode, then leakage light is suppressed, but power consumption increases and responsiveness decreases
Solution Approach 1:
By introducing the circular polarizing film as an intermediary, the system can operate the liquid crystal shutter device in the more efficient non-scattering mode while still achieving leakage light suppression. The polarizing film handles the light control function that would otherwise require scattering mode operation, thereby reducing power consumption and improving responsiveness
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 configuration prevents leakage light from being visually perceived, enabling effective switching between image information on and off, reducing power consumption, and improving the responsiveness and longevity of the liquid crystal shutter device.
Implementation Method 1
a polarization layer disposed between the liquid crystal panel and the liquid crystal shutter device so that in a rotation direction where the polymers are aligned in a twisted manner, an absorption axis thereof is set in a direction substantially perpendicular to a radial direction where the polymers are twisted by half the twist angle
Implementation Method 2
in an electric field application state, an alignment direction of the liquid crystal molecules is changed by the electric field, the refractive index is discontinuous between the liquid crystal molecule portion and the polymer portion. Therefore, the polymer dispersion type liquid crystal layer operates in a scattering mode where incident light is emitted in a scattered manner
Implementation Method 3
since the refractive index of the polymers and the liquid crystal molecules in the non-electric field application state are constant or change continuously, the polymer dispersion type liquid crystal layer operates in a non-scattering mode where incident light is emitted without being scattered
Data Source
AI summary
A liquid crystal display device is provided which includes: a liquid crystal panel; an image information application unit disposed on a side opposite to a display side of the liquid crystal panel; an illumination unit for irradiating light to the image information application unit; a liquid crystal shutter device disposed between the image information application unit and the liquid crystal panel; a polymer dispersion type liquid crystal layer disposed in the liquid crystal shutter device and containing liquid crystal molecules and polymers, in which the polymers are aligned in a twisted manner at a twist angle larger than 0 degree and smaller than 180 degrees; and a polarization layer disposed between the liquid crystal panel and the liquid crystal shutter device so that in a rotation direction where the polymers are aligned in a twisted manner, an absorption axis thereof is set in a direction substantially perpendicular to a radial direction where the polymers are twisted by half the twist angle.