Polarization Dichroism Display Panel for Automotive Privacy
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Solution Overview
Problem
Existing automotive display panels struggle with active privacy solutions for full area local dimming (FALD/matrix backlighting) and organic light-emitting diodes (OLED), due to reliance on switchable backlights, high power consumption, and color shift issues at various viewing angles.
Innovation Solution
A display panel incorporating a first polarizer, a liquid crystal retarder, a passive dichroic dye film, and a display, with a control signal switchable between private and public modes to adjust polarization and viewing angles, thereby optimizing privacy and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switchable backlight is used to achieve active privacy, then privacy control is enabled, but the solution is not compatible with FALD and OLED displays and requires multiple stacked displays
Solution Approach 1:
The patent combines the privacy control function directly into the display structure by integrating a liquid crystal retarder and dichroic dye film with the display layers. This merging eliminates the need for separate switchable backlight units and multiple stacked displays, while maintaining compatibility with FALD and OLED display technologies. The privacy control is achieved through the optical properties of the integrated layers rather than through separate backlight switching mechanisms.
Solution Approach 2:
The integrated liquid crystal retarder and dichroic dye film structure serves multiple functions: it provides privacy control, maintains compatibility with different display types (FALD, OLED), and eliminates the need for separate backlight switching hardware. This multi-functional design replaces the need for specialized switchable backlight units with a universal solution that works across different display technologies.
2Adaptability or versatility
If multiple stacked displays are used for privacy control, then active privacy is achieved, but power consumption increases
Solution Approach 1:
By merging the privacy control mechanism into the display structure itself, the patent eliminates the need for multiple independent display units that would each consume power. The integrated liquid crystal and dichroic layers are controlled through the existing display's backlight or light source, significantly reducing overall power consumption while maintaining active privacy control functionality.
3Adaptability or versatility
If existing privacy solutions are implemented, then privacy control is achieved, but color shift occurs at various viewing angles
Solution Approach 1:
The dichroic dye film acts as an intermediary layer between the liquid crystal retarder and the display output. This intermediary selectively transmits or blocks light based on polarization state and viewing angle, enabling privacy control while maintaining color consistency. The dichroic properties of the dye film ensure that color shift is minimized across different viewing angles while still providing effective privacy 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 provides a narrower private viewing angle and a wider public viewing angle, improving privacy and visibility while reducing power consumption and eliminating color shift issues at various viewing angles.
Implementation Method 1
The first polarizer is operational to transfer a light with a first polarization oriented in a first direction
Implementation Method 2
The first liquid crystal retarder transfers the light received from the first polarizer in response to a control signal. The control signal is switchable between a private mode and a public mode. The private mode maintains the first polarization of the light oriented in the first direction. The public mode rotates the first polarization of the light to a second polarization oriented in a second direction
Implementation Method 3
The passive dichroic dye film is mounted adjacent to the first liquid crystal retarder. The light with the first polarization in the private mode is absorbed by the passive dichroic dye film for off-axis incident angles in the first direction and transmitted for a normal incidence angle and the off-axis incidence angles in the second direction
Data Source
AI summary
A display panel includes a polarizer, a liquid crystal retarder, a passive dichroic dye film, and a display. The polarizer transfers a light with a polarization in an orientation. The liquid crystal retarder transfers the light in response to a control signal. A private mode maintains the polarization and the orientation of the light. A public mode rotates the polarization and the orientation of the light. The light with a first polarization in the private mode is absorbed by the passive dichroic dye film for off-axis incident angles in the first direction and transmitted for normal incidence angle and off-axis incidence angles in the second direction. The light with a second polarization in the public mode is transmitted for normal incidence angle and off-axis incidence angles in the first direction and absorbed for off-axis incidence in the second direction. The display is operational to generate an image in the light.