Automotive Display Viewing Angle Switching via Photochromic Film
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Solution Overview
Problem
Display devices in automobiles face challenges in switching between wide and narrow viewing angles without making the narrow viewing angle excessively narrow, particularly when using liquid crystal barrier panels in conjunction with display panels.
Innovation Solution
Incorporating an ultraviolet light guide plate and a photochromic film that changes absorption rates with ultraviolet light, allowing for a barrier that can be brought closer to the display panel, enabling efficient switching between wide and narrow viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal barrier panel is used to switch viewing angles, then the viewing angle can be switched between wide and narrow, but the narrow viewing angle becomes excessively narrow
Solution Approach 1:
The patent extracts the barrier function from a traditional liquid crystal barrier panel and implements it using a reflective film with light-blocking patterns formed directly on the display panel surface. This removes the need for separate barrier panels and their associated optical components, allowing the barrier to be positioned much closer to the display panel and preventing the viewing angle from becoming excessively narrow while maintaining the viewing angle switching capability.
2Object-generated harmful factors
If additional elements like glass plates or polarizing plates are added to create a barrier, then light shielding is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the barrier function with the display panel structure itself by forming light-blocking patterns directly on the display panel surface using a reflective film. This integration eliminates the need for separate glass plates, polarizing plates, and liquid crystal barrier panels, achieving effective light shielding while significantly reducing device complexity.
Solution Approach 2:
The reflective film serves multiple functions: it acts as both a barrier for light shielding and maintains display functionality. The same film structure that blocks light in certain viewing angles also reflects light to maintain image visibility, eliminating the need for separate components for each 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
This configuration allows for effective switching between wide and narrow viewing angles while preventing the narrow angle from becoming excessively narrow, maintaining high resolution and luminance, and ensuring the barrier is minimized, reducing the need for additional elements like glass plates or polarizing plates.
Implementation Method 1
The film is made of a photochromic photosensitive material. The ultraviolet light source irradiates an end surface of the ultraviolet light guide plate with ultraviolet light.
Data Source
AI summary
A viewing angle between a wide viewing angle and a narrow viewing angle is switched, and the viewing angle is suppressed from becoming excessively narrow when the viewing angle is switched to the narrow viewing angle. The ultraviolet light guide plate is superimposed on the display panel. A first main surface of the ultraviolet light guide plate is on a side where the pixels are disposed. The film is disposed on the first main surface of the ultraviolet light guide plate. Openings of the film are disposed on an optical path that passes through the pixels and travels in a first direction. Non-opening portions of the film are disposed on an optical path that passes through the pixels and travels in a second direction. The film is made of a photochromic photosensitive material. The ultraviolet light source irradiates an end surface of the ultraviolet light guide plate with ultraviolet light.