Vehicle Display Viewing Angle Control via Variable Patterns
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Solution Overview
Problem
Display apparatuses installed in vehicles often cause driver distraction due to their wide viewing angles, increasing the risk of accidents by dispersing the driver's gaze.
Innovation Solution
A display apparatus with a viewing angle control unit comprising light-blocking patterns and variable patterns between the back-light unit and the liquid crystal panel, where the transmittance of the variable patterns is controlled by electrodes, allowing selective limitation of the viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal panel is used with a back-light unit, then the display apparatus can provide wide viewing angles for image recognition, but the driver's gaze is dispersed which increases the possibility of accidents
Solution Approach 1:
The patent applies local quality by creating different optical properties in different regions of the display. The light-blocking patterns are strategically positioned to block light in specific viewing directions while allowing light transmission in the driver's viewing direction. This creates spatially varying transmittance characteristics that limit the viewing angle to prevent driver distraction while maintaining adequate visibility for the driver
Solution Approach 2:
The patent introduces an intermediary layer between the back-light unit and the liquid crystal panel that includes light-blocking patterns and variable patterns. This intermediary structure mediates the light transmission by selectively blocking light in certain directions while allowing it in others, thus controlling the viewing angle without completely obstructing the display output
2Reliability
If the viewing angle is limited to prevent driver distraction, then accident risk is reduced, but visibility deviation occurs due to changes in viewing position
Solution Approach 1:
The patent employs dynamics by using variable patterns that can change their optical properties in response to applied voltages. The transmittance of each variable pattern is changed according to a voltage applied to control electrodes, allowing the display to dynamically adjust its viewing angle characteristics. This enables the system to maintain optimal visibility for the driver while preventing distraction to other road users
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 limits the viewing angle, reducing driver distraction and minimizing visibility deviations caused by changes in the viewing position, thereby preventing accidents.
Implementation Method 1
Each of the variable patterns may include a transparent fluid and black particles. The black particles may be dispersed in the transparent fluid. The transmittance of each variable pattern is changed according to a voltage applied to the first control electrode and the second control electrode.
Data Source
AI summary
A display apparatus includes a liquid crystal panel disposed on a back-light unit; and a viewing angle control unit disposed between the back-light unit and the liquid crystal panel, wherein the viewing angle control unit includes light-blocking patterns having a light-blocking material and variable patterns disposed between a first control electrode and a second control electrode, wherein the variable patterns are extended in a direction perpendicular to the light-blocking patterns, and wherein transmittance of each variable pattern is changed according to a voltage applied to the first control electrode and the second control electrode, thereby preventing a distraction of people around a user by selectively sharing a realized image.