Liquid Crystal Dimmer Cell for Peep-Proof Display with Reflective Polarizer
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Solution Overview
Problem
Conventional peep-proof displays with louver structure films suffer from significant surface luminance attenuation, compromising display visibility and privacy protection.
Innovation Solution
A display device incorporating a liquid crystal dimmer cell with a polymer network and liquid crystals, combined with polarizing plates and a reflective polarizing layer, which adjusts the orientation of liquid crystals to control light transmission and reflection, maintaining front-view visibility while reducing side-view visibility without affecting surface luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peep-proof protective film with louver structure is added to achieve privacy protection, then the peep-proof function is improved, but the surface luminance of the display device is significantly attenuated
Solution Approach 1:
The patent changes the structural parameters of the liquid crystal molecules by introducing a polymer network that forms a specific spatial arrangement. This network structure modifies the optical parameters of the liquid crystal layer, enabling it to selectively block oblique light while maintaining high transmission for front-view light, thus resolving the luminance attenuation problem caused by conventional louver structures
Solution Approach 2:
The patent creates a composite liquid crystal system by combining liquid crystal molecules with a polymer network. This composite structure integrates the optical anisotropy of liquid crystals with the structural stability of polymers, forming a material that can dynamically control light transmission angles while maintaining high luminance for legitimate viewers
2Reliability
If a peep-proof protective film with louver structure is added to achieve privacy protection, then the peep-proof function is improved, but the viewing angle of the display device is reduced
Solution Approach 1:
The patent introduces a dynamic element to the display system by enabling switching between different display modes through voltage control. The liquid crystal dimmer cell can be adjusted to provide either peep-proof protection or wide viewing angle mode, making the display adaptable to different usage scenarios without compromising either function
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 effectively achieves a peep-proof function while minimizing luminance loss, allowing for a wider viewing angle without compromising front-view display clarity, and can switch between peep-proof and wide-viewing modes as needed.
Implementation Method 1
a liquid crystal dimmer cell disposed on a light emitting side of the display panel and comprising a liquid crystal layer, wherein the liquid crystal layer comprises a polymer network and liquid crystals dispersed in the polymer network
Implementation Method 2
the polymer network is arranged in a first direction, the first direction is inclined with respect to a normal line of the first polarizing plate, and the display device comprises a first display mode, and in the first display mode, a long axis of the liquid crystal is arranged in the first direction
Implementation Method 3
a reflective polarizing layer disposed between the liquid crystal dimmer cell and the display panel; wherein a direction of a transmission axis of the reflective polarizing layer is same as a direction of a transmission axis of the first polarizing plate
Implementation Method 4
a reflection surface of the reflective polarizing layer faces the liquid crystal dimmer cell
Implementation Method 5
a first polarizing plate disposed on a side of the liquid crystal dimmer cell away from the display panel; a second polarizing plate disposed on a side of the display panel away from the light emitting side, wherein a direction of a transmission axis of the second polarizing plate is perpendicular to a direction of a transmission axis of the reflective polarizing layer
Data Source
AI summary
Disclosed is a display device including a display panel, a reflective polarizing layer, a liquid crystal dimmer cell, and a first polarizing plate which are sequentially stacked, wherein a reflection surface of the reflective polarizing layer faces the liquid crystal dimmer cell, and a direction of a transmission axis of the reflective polarizing layer is same as a direction of a transmission axis of the first polarizing plate, so that not only a peep-proof function of the display device can be realized, but also ambient light with a large viewing angle can be reflected, which can further reduce the visibility of the display screen under the large viewing angle without affecting the display at the front viewing angle.