OLED Display Privacy Mode Through Active Viewing-Angle Control
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Solution Overview
Problem
Conventional personal display devices rely on attaching and detaching privacy protection films, which is inconvenient and lacks active control over viewing angles.
Innovation Solution
A display device with a switching part and a first pixel circuit that actively controls the viewing angle by outputting different voltages in different modes, allowing for adjustable privacy protection without physical films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a privacy protection film is attached to the display, then viewing angle control is achieved, but device complexity increases and ease of operation deteriorates due to manual attachment and detachment
Solution Approach 1:
The patent replaces the mechanical system of physically attaching and detaching privacy protection films with an electrical control system. The switching part uses voltage signals to control the first transistor, which in turn controls the organic light emitting diode to adjust viewing angle dynamically without any physical film manipulation by the user.
Solution Approach 2:
The patent implements dynamic control of the viewing angle through electrical switching between different operational modes. The switching part can dynamically transition between first mode (privacy protection with narrow viewing angle) and second mode (normal display with wide viewing angle) by changing the voltage state of the first transistor, enabling real-time adaptability without physical reconfiguration.
2Adaptability or versatility
If a privacy protection film is attached, then viewing angle control is achieved, but device complexity increases
Solution Approach 1:
The patent eliminates the mechanical film attachment mechanism entirely by substituting it with an electrical control circuit. The switching part and transistor configuration provide the same privacy protection function through electrical means, significantly reducing device complexity while maintaining adaptability.
Solution Approach 2:
The patent integrates multiple functions into existing display components. The first transistor and switching part serve dual purposes: they control both the normal operation of the organic light emitting diode and the privacy protection mode, eliminating the need for separate film attachment mechanisms and reducing overall device complexity.
3Ease of operation
If voltage control is used to adjust viewing angle, then ease of operation improves, but power consumption increases
Solution Approach 1:
The patent employs periodic or pulsed voltage control through the switching part rather than continuous voltage application. The switching part activates the first transistor only when mode transition is required, and the organic light emitting diode operates in discrete modes (first mode for privacy, second mode for normal display), reducing overall power consumption compared to continuous analog control.
Solution Approach 2:
The patent uses discrete parameter changes (voltage levels) to control the transistor switching between modes, rather than continuous parameter adjustment. The switching part transitions between defined voltage states (first voltage for privacy mode, second voltage for normal mode), which is more energy-efficient than maintaining variable voltage levels for continuous viewing angle adjustment.
Data Source
AI summary
A display device includes a switching part and a first pixel circuit electrically connected to the switching part, and the switching part outputs a turn-off voltage to a first node in a first mode and outputs an initialization voltage to the first node in a second mode. The first pixel circuit includes a first transistor including a gate terminal electrically connected to the first node, a first terminal electrically connected to a second node, and a second terminal electrically connected to an organic light emitting diode and a second transistor including a gate terminal which receives a gate signal, a first terminal which receives a data voltage, and a second terminal electrically connected to the second node.