Liquid Crystal Viewing-Angle Control for Automotive Displays
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Solution Overview
Problem
Existing display devices lack the ability to efficiently switch between private and public viewing modes while maintaining high brightness and avoiding complex manufacturing processes.
Innovation Solution
A display device incorporating a liquid crystal optics unit with liquid crystals that change refractive index profiles based on applied electrical voltages, controlled by a dynamic control unit, allowing for variable viewing modes and seamless transitions between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If barrier or lamellar films are placed in front of the liquid crystal display panel to restrict the viewing area, then the viewing angle is limited for privacy, but the brightness of the display is significantly reduced due to high light absorption
Solution Approach 1:
The patent uses liquid crystal materials that change their optical parameters (refractive index, orientation) in response to applied voltage. By changing the voltage state, the liquid crystal layer transitions between different viewing angle configurations without absorbing light, thus maintaining brightness while controlling privacy.
Solution Approach 2:
The patent replaces mechanical or static optical elements (lamellar films, fixed lenses) with an electrically controllable liquid crystal system. This substitution allows dynamic adjustment of viewing angles through electrical signals rather than physical reconfiguration, eliminating the light absorption problem associated with static barrier films.
2Illumination intensity
If lenses or lenticulars are arranged in front of the liquid crystal display panel to limit viewing to a small angular range, then the viewing angle is restricted, but the light output is greater compared to barrier films
Solution Approach 1:
The patent implements a dynamic system where the liquid crystal layer can continuously adjust its viewing angle characteristics in real-time. Unlike fixed lenses that provide static viewing angle control, the liquid crystal system can adapt the viewing cone dynamically, expanding or contracting it based on operational mode (privacy mode vs. public mode).
3Adaptability or versatility
If two different backlighting units are used, one for large viewing area and one for small viewing area, then switching between public and private modes is possible, but the device complexity and manufacturing cost significantly increase
Solution Approach 1:
The patent makes a single backlighting unit multi-functional by placing a liquid crystal layer in front of it. The liquid crystal layer acts as a controllable optical element that can direct the same backlight output to different angular ranges. This allows one backlighting unit to serve multiple purposes (public display and private display) without requiring duplicate hardware.
Solution Approach 2:
The liquid crystal layer serves as an intermediary between the backlighting unit and the display panel. It controls the angular distribution of light from the backlight without requiring multiple backlighting units. By adjusting the liquid crystal orientation, the system mediates between the single light source and the different viewing mode requirements.
4Ease of manufacture
If a single backlighting unit is used without additional optical elements, then the manufacturing is simple and cost-effective, but the ability to switch between private and public viewing modes is lost
Solution Approach 1:
The patent adds a liquid crystal layer that can change its optical parameters (refractive index, molecular orientation) in response to electrical voltage. This allows a single, simple backlighting unit to dynamically adjust the viewing angle and switch between public and private modes without requiring complex mechanical reconfiguration or multiple hardware components.
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
Enables flexible and cost-effective switching between private and public viewing modes with continuous transitions, enhancing display device functionality in automotive applications.
Implementation Method 1
the liquid crystal optics unit comprises liquid crystals which change their refractive index profiles depending on applied electrical voltages
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
The aim of the invention is to provide a display device which has variable viewing modes and can be inexpensively produced with little technical complexity. This is achieved by a display device (100) comprising a backlighting unit (10), a liquid crystal display panel (11), at least one liquid crystal optical unit (12, 12a, 12b), and a control unit (16), wherein the liquid crystal optical unit (12, 12a, 12b) comprises liquid crystals (13) which have refractive index curves that change in accordance with an applied electric voltage (22). According to the invention, the control unit (16) is designed to produce a dynamic change in the emission characteristic of the display device (100) by actuating the liquid crystal optical unit (12, 12a, 12b).