OLED Display Privacy via Electrochromic Filter Voltage Control
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Solution Overview
Problem
OLED displays face challenges in maintaining privacy due to their wide viewing angles, which can lead to unwanted ambient reflections and visibility of content from various directions, compromising confidentiality in information handling systems.
Innovation Solution
Incorporating an electrochromic (EC) filter that can switch between a wide viewing angle mode and a restricted viewing angle mode by applying different voltages, allowing the OLED display to be viewed exclusively within a narrower angle when privacy is required, using a privacy controller to manage the EC filter's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If OLED display uses wide viewing angle design, then visibility from various directions is improved, but privacy and content confidentiality deteriorate
Solution Approach 1:
The patent applies the dynamics principle by implementing an electrochromic filter that can dynamically change its optical properties between different states. The filter transitions from a transparent state (allowing wide viewing angles for accessibility) to a privacy-protecting state (restricting viewing angles to protect confidentiality) based on applied voltage, making the display system adaptive rather than static
Solution Approach 2:
The patent employs parameter changes by utilizing the electrochromic effect to alter the optical parameters of the filter layer. By changing the voltage applied to the electrochromic filter, the system modifies the filter's light transmission characteristics, thereby controlling the viewing angle and resolving the contradiction between wide visibility and privacy protection
2Loss of information
If EC filter restricts viewing angle for privacy, then content confidentiality is improved, but viewing accessibility deteriorates
Solution Approach 1:
The system dynamically switches between privacy-protecting and accessibility-friendly states using the electrochromic filter. When privacy is required, the filter restricts viewing angles; when accessibility is needed, the filter returns to transparent state, allowing the system to adapt to different usage scenarios
Solution Approach 2:
By changing the electrical parameter (voltage) applied to the electrochromic filter, the system modifies the optical parameter (viewing angle restriction), enabling reversible transition between confidentiality protection and viewing accessibility modes
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 EC filter effectively restricts the viewing angle of the OLED display, enhancing privacy by allowing the content to be viewed only within a specified range, thereby reducing the risk of unauthorized access while maintaining visibility within the desired angles in open mode.
Implementation Method 1
An EC filter may permit the image to be viewed within a first viewing angle in response to a first voltage applied to the EC filter, and may permit the image to be viewed exclusively within a second viewing angle in response to a second voltage applied to the EC filter
Data Source
AI summary
An organic light emitting diode (OLED) display includes an OLED panel and an electroconductive (EC) filter. The OLED panel provides an image. The EC filter permits the image to be viewed within a first viewing angle in response to a first voltage applied to the EC filter, and permits the image to be viewed exclusively within a second viewing angle in response to a second voltage applied to the EC filter.