Viewing Angle Control Film Using Pulse Voltage to Prevent Dark Spots
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Solution Overview
Problem
Existing viewing angle control films experience luminance reduction and dark spot defects due to agglomeration of light blocking particles when operated in a wide viewing angle mode for extended periods, leading to reduced performance and potential stains.
Innovation Solution
A viewing angle control film with a light conversion layer and partition walls, utilizing a controller to apply pulse voltages in specific patterns to manage the movement of light blocking particles, preventing agglomeration and maintaining optimal luminance and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the viewing angle control film is driven for a long period of time in share mode, then the wide viewing angle is achieved, but the light blocking particles aggregate and cause luminance reduction and dark spot defects
Solution Approach 1:
The patent applies periodic action by alternating between share mode and private mode operation. The controller switches the viewing angle control film between these two modes, allowing the light blocking particles to disperse during private mode operation and aggregate during share mode operation. This periodic switching prevents continuous aggregation of particles in share mode, thereby maintaining luminance stability and preventing dark spot defects while still achieving wide viewing angle when needed.
2Ease of operation
If the light blocking particles are aggregated to control viewing angle, then the viewing angle is narrowed for privacy protection, but the reactivity to electrical signals is reduced
Solution Approach 1:
The patent uses periodic action by alternating between aggregation and dispersion states of the light blocking particles. During private mode, the particles aggregate to block light and protect privacy. During share mode, the particles disperse to improve electrical signal response and maintain luminance. This periodic switching allows the system to achieve both privacy protection and good electrical signal response at different times, resolving the contradiction between these two requirements.
3Ease of operation
If a narrow viewing angle is provided for privacy protection, then personal information is protected from side viewing, but the display is less versatile for different usage scenarios
Solution Approach 1:
The patent applies dynamics by making the viewing angle controllable rather than fixed. The viewing angle control film dynamically adjusts its light blocking characteristics based on operational mode. In private mode, it provides a narrow viewing angle for privacy protection. In share mode, it provides a wide viewing angle for versatility. This dynamic adaptability allows the display to serve different usage scenarios while maintaining privacy protection when needed, resolving the contradiction between these two requirements.
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
Prevents luminance reduction and dark spot defects by effectively managing the distribution of light blocking particles, ensuring consistent performance even in long-term wide viewing angle operation.
Implementation Method 1
a user can turn on/off the viewing angle control, and it is possible to block light in a specific direction or to transmit light in a specific direction by dispersion and agglomeration of light blocking particles according to an electrical signal
Data Source
AI summary
A viewing angle control film and a display device including the viewing angle control film are discussed. The viewing angle control film can include a first electrode, a second electrode facing away from the first electrode, a light conversion layer disposed between the first electrode and the second electrode, and a controller configured to adjust a viewing angle of the light conversion layer by controlling a voltage applied between the first electrode and the second electrode. The light conversion layer can include a plurality of partition walls disposed to be spaced apart between the first electrode and the second electrode, a plurality of containing portions disposed between the partition walls and arranged at regular intervals along the first electrode, and light blocking particles provided in each of the plurality of containing portions. The controller applies a pulse voltage in a share mode that operates in a wide viewing angle.